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/* ELF executable support for BFD.
Copyright 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support, from information published
in "UNIX System V Release 4, Programmers Guide: ANSI C and
Programming Support Tools". Sufficient support for gdb.
Rewritten by Mark Eichin @ Cygnus Support, from information
published in "System V Application Binary Interface", chapters 4
and 5, as well as the various "Processor Supplement" documents
derived from it. Added support for assembler and other object file
utilities. Further work done by Ken Raeburn (Cygnus Support), Michael
Meissner (Open Software Foundation), and Peter Hoogenboom (University
of Utah) to finish and extend this.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Problems and other issues to resolve.
(1) BFD expects there to be some fixed number of "sections" in
the object file. I.E. there is a "section_count" variable in the
bfd structure which contains the number of sections. However, ELF
supports multiple "views" of a file. In particular, with current
implementations, executable files typically have two tables, a
program header table and a section header table, both of which
partition the executable.
In ELF-speak, the "linking view" of the file uses the section header
table to access "sections" within the file, and the "execution view"
uses the program header table to access "segments" within the file.
"Segments" typically may contain all the data from one or more
"sections".
Note that the section header table is optional in ELF executables,
but it is this information that is most useful to gdb. If the
section header table is missing, then gdb should probably try
to make do with the program header table. (FIXME)
(2) The code in this file is compiled twice, once in 32-bit mode and
once in 64-bit mode. More of it should be made size-independent
and moved into elf.c.
(3) ELF section symbols are handled rather sloppily now. This should
be cleaned up, and ELF section symbols reconciled with BFD section
symbols.
*/
#include <string.h> /* For strrchr and friends */
#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "libelf.h"
/* Renaming structures, typedefs, macros and functions to be size-specific. */
#define Elf_External_Ehdr NAME(Elf,External_Ehdr)
#define Elf_External_Sym NAME(Elf,External_Sym)
#define Elf_External_Shdr NAME(Elf,External_Shdr)
#define Elf_External_Phdr NAME(Elf,External_Phdr)
#define Elf_External_Rel NAME(Elf,External_Rel)
#define Elf_External_Rela NAME(Elf,External_Rela)
#define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
#define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
#define elf_core_file_matches_executable_p \
NAME(bfd_elf,core_file_matches_executable_p)
#define elf_object_p NAME(bfd_elf,object_p)
#define elf_core_file_p NAME(bfd_elf,core_file_p)
#define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
#define elf_get_dynamic_symtab_upper_bound \
NAME(bfd_elf,get_dynamic_symtab_upper_bound)
#define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
#define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
#define elf_get_symtab NAME(bfd_elf,get_symtab)
#define elf_canonicalize_dynamic_symtab \
NAME(bfd_elf,canonicalize_dynamic_symtab)
#define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol)
#define elf_get_symbol_info NAME(bfd_elf,get_symbol_info)
#define elf_print_symbol NAME(bfd_elf,print_symbol)
#define elf_get_lineno NAME(bfd_elf,get_lineno)
#define elf_set_arch_mach NAME(bfd_elf,set_arch_mach)
#define elf_find_nearest_line NAME(bfd_elf,find_nearest_line)
#define elf_sizeof_headers NAME(bfd_elf,sizeof_headers)
#define elf_set_section_contents NAME(bfd_elf,set_section_contents)
#define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto)
#define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel)
#define elf_new_section_hook NAME(bfd_elf,new_section_hook)
#define write_relocs NAME(bfd_elf,_write_relocs)
#define elf_find_section NAME(bfd_elf,find_section)
#define elf_bfd_link_add_symbols NAME(bfd_elf,bfd_link_add_symbols)
#define elf_bfd_final_link NAME(bfd_elf,bfd_final_link)
#if ARCH_SIZE == 64
#define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
#define ELF_R_SYM(X) ELF64_R_SYM(X)
#define ELF_R_TYPE(X) ELF64_R_TYPE(X)
#define ELFCLASS ELFCLASS64
#define FILE_ALIGN 8
#endif
#if ARCH_SIZE == 32
#define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
#define ELF_R_SYM(X) ELF32_R_SYM(X)
#define ELF_R_TYPE(X) ELF32_R_TYPE(X)
#define ELFCLASS ELFCLASS32
#define FILE_ALIGN 4
#endif
/* Forward declarations of static functions */
static void elf_swap_reloc_in
PARAMS ((bfd *, Elf_External_Rel *, Elf_Internal_Rel *));
static void elf_swap_reloc_out
PARAMS ((bfd *, Elf_Internal_Rel *, Elf_External_Rel *));
static void elf_swap_reloca_in
PARAMS ((bfd *, Elf_External_Rela *, Elf_Internal_Rela *));
static void elf_swap_reloca_out
PARAMS ((bfd *, Elf_Internal_Rela *, Elf_External_Rela *));
static unsigned long bfd_add_to_strtab
PARAMS ((bfd *, struct strtab *, const char *));
static asection *section_from_elf_index PARAMS ((bfd *, unsigned int));
static int elf_section_from_bfd_section PARAMS ((bfd *, struct sec *));
static long elf_slurp_symbol_table PARAMS ((bfd *, asymbol **, boolean));
static int elf_symbol_from_bfd_symbol PARAMS ((bfd *,
struct symbol_cache_entry **));
static boolean elf_compute_section_file_positions
PARAMS ((bfd *, struct bfd_link_info *));
static boolean prep_headers PARAMS ((bfd *));
static boolean assign_section_numbers PARAMS ((bfd *));
static boolean assign_file_positions_except_relocs PARAMS ((bfd *, boolean));
static INLINE file_ptr assign_file_positions_for_symtab_and_strtabs
PARAMS ((bfd *, file_ptr, boolean));
static boolean elf_map_symbols PARAMS ((bfd *));
static boolean swap_out_syms PARAMS ((bfd *));
static boolean bfd_section_from_shdr PARAMS ((bfd *, unsigned int shindex));
#ifdef DEBUG
static void elf_debug_section PARAMS ((char *, int, Elf_Internal_Shdr *));
static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
#endif
#define elf_string_from_elf_strtab(abfd,strindex) \
elf_string_from_elf_section(abfd,elf_elfheader(abfd)->e_shstrndx,strindex)
/* Structure swapping routines */
/* Should perhaps use put_offset, put_word, etc. For now, the two versions
can be handled by explicitly specifying 32 bits or "the long type". */
#if ARCH_SIZE == 64
#define put_word bfd_h_put_64
#define get_word bfd_h_get_64
#endif
#if ARCH_SIZE == 32
#define put_word bfd_h_put_32
#define get_word bfd_h_get_32
#endif
/* Translate an ELF symbol in external format into an ELF symbol in internal
format. */
static void
elf_swap_symbol_in (abfd, src, dst)
bfd *abfd;
Elf_External_Sym *src;
Elf_Internal_Sym *dst;
{
dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
}
/* Translate an ELF symbol in internal format into an ELF symbol in external
format. */
static void
elf_swap_symbol_out (abfd, src, dst)
bfd *abfd;
Elf_Internal_Sym *src;
Elf_External_Sym *dst;
{
bfd_h_put_32 (abfd, src->st_name, dst->st_name);
put_word (abfd, src->st_value, dst->st_value);
put_word (abfd, src->st_size, dst->st_size);
bfd_h_put_8 (abfd, src->st_info, dst->st_info);
bfd_h_put_8 (abfd, src->st_other, dst->st_other);
bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
}
/* Translate an ELF file header in external format into an ELF file header in
internal format. */
static void
elf_swap_ehdr_in (abfd, src, dst)
bfd *abfd;
Elf_External_Ehdr *src;
Elf_Internal_Ehdr *dst;
{
memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
}
/* Translate an ELF file header in internal format into an ELF file header in
external format. */
static void
elf_swap_ehdr_out (abfd, src, dst)
bfd *abfd;
Elf_Internal_Ehdr *src;
Elf_External_Ehdr *dst;
{
memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
/* note that all elements of dst are *arrays of unsigned char* already... */
bfd_h_put_16 (abfd, src->e_type, dst->e_type);
bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
bfd_h_put_32 (abfd, src->e_version, dst->e_version);
put_word (abfd, src->e_entry, dst->e_entry);
put_word (abfd, src->e_phoff, dst->e_phoff);
put_word (abfd, src->e_shoff, dst->e_shoff);
bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
}
/* Translate an ELF section header table entry in external format into an
ELF section header table entry in internal format. */
static void
elf_swap_shdr_in (abfd, src, dst)
bfd *abfd;
Elf_External_Shdr *src;
Elf_Internal_Shdr *dst;
{
dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
/* we haven't done any processing on it yet, so... */
dst->rawdata = (void *) 0;
}
/* Translate an ELF section header table entry in internal format into an
ELF section header table entry in external format. */
static void
elf_swap_shdr_out (abfd, src, dst)
bfd *abfd;
Elf_Internal_Shdr *src;
Elf_External_Shdr *dst;
{
/* note that all elements of dst are *arrays of unsigned char* already... */
bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
put_word (abfd, src->sh_flags, dst->sh_flags);
put_word (abfd, src->sh_addr, dst->sh_addr);
put_word (abfd, src->sh_offset, dst->sh_offset);
put_word (abfd, src->sh_size, dst->sh_size);
bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
put_word (abfd, src->sh_addralign, dst->sh_addralign);
put_word (abfd, src->sh_entsize, dst->sh_entsize);
}
/* Translate an ELF program header table entry in external format into an
ELF program header table entry in internal format. */
static void
elf_swap_phdr_in (abfd, src, dst)
bfd *abfd;
Elf_External_Phdr *src;
Elf_Internal_Phdr *dst;
{
dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
}
static void
elf_swap_phdr_out (abfd, src, dst)
bfd *abfd;
Elf_Internal_Phdr *src;
Elf_External_Phdr *dst;
{
/* note that all elements of dst are *arrays of unsigned char* already... */
bfd_h_put_32 (abfd, src->p_type, dst->p_type);
put_word (abfd, src->p_offset, dst->p_offset);
put_word (abfd, src->p_vaddr, dst->p_vaddr);
put_word (abfd, src->p_paddr, dst->p_paddr);
put_word (abfd, src->p_filesz, dst->p_filesz);
put_word (abfd, src->p_memsz, dst->p_memsz);
bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
put_word (abfd, src->p_align, dst->p_align);
}
/* Translate an ELF reloc from external format to internal format. */
static INLINE void
elf_swap_reloc_in (abfd, src, dst)
bfd *abfd;
Elf_External_Rel *src;
Elf_Internal_Rel *dst;
{
dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
}
static INLINE void
elf_swap_reloca_in (abfd, src, dst)
bfd *abfd;
Elf_External_Rela *src;
Elf_Internal_Rela *dst;
{
dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
dst->r_addend = get_word (abfd, (bfd_byte *) src->r_addend);
}
/* Translate an ELF reloc from internal format to external format. */
static INLINE void
elf_swap_reloc_out (abfd, src, dst)
bfd *abfd;
Elf_Internal_Rel *src;
Elf_External_Rel *dst;
{
put_word (abfd, src->r_offset, dst->r_offset);
put_word (abfd, src->r_info, dst->r_info);
}
static INLINE void
elf_swap_reloca_out (abfd, src, dst)
bfd *abfd;
Elf_Internal_Rela *src;
Elf_External_Rela *dst;
{
put_word (abfd, src->r_offset, dst->r_offset);
put_word (abfd, src->r_info, dst->r_info);
put_word (abfd, src->r_addend, dst->r_addend);
}
/* String table creation/manipulation routines */
static struct strtab *
bfd_new_strtab (abfd)
bfd *abfd;
{
struct strtab *ss;
ss = (struct strtab *) malloc (sizeof (struct strtab));
if (!ss)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
ss->tab = malloc (1);
if (!ss->tab)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
*ss->tab = 0;
ss->nentries = 0;
ss->length = 1;
return ss;
}
static unsigned long
bfd_add_to_strtab (abfd, ss, str)
bfd *abfd;
struct strtab *ss;
const char *str;
{
/* should search first, but for now: */
/* include the trailing NUL */
int ln = strlen (str) + 1;
/* FIXME: This is slow. Also, we could combine this with the a.out
string table building and use a hash table, although it might not
be worth it since ELF symbols don't include debugging information
and thus have much less overlap. */
ss->tab = realloc (ss->tab, ss->length + ln);
if (ss->tab == NULL)
{
bfd_set_error (bfd_error_no_memory);
return (unsigned long) -1;
}
strcpy (ss->tab + ss->length, str);
ss->nentries++;
ss->length += ln;
return ss->length - ln;
}
static int
bfd_add_2_to_strtab (abfd, ss, str, str2)
bfd *abfd;
struct strtab *ss;
char *str;
CONST char *str2;
{
/* should search first, but for now: */
/* include the trailing NUL */
int ln = strlen (str) + strlen (str2) + 1;
/* should this be using obstacks? */
if (ss->length)
ss->tab = realloc (ss->tab, ss->length + ln);
else
ss->tab = malloc (ln);
BFD_ASSERT (ss->tab != 0); /* FIXME */
strcpy (ss->tab + ss->length, str);
strcpy (ss->tab + ss->length + strlen (str), str2);
ss->nentries++;
ss->length += ln;
return ss->length - ln;
}
/* ELF .o/exec file reading */
/* Create a new bfd section from an ELF section header. */
static boolean
bfd_section_from_shdr (abfd, shindex)
bfd *abfd;
unsigned int shindex;
{
Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[shindex];
Elf_Internal_Ehdr *ehdr = elf_elfheader (abfd);
asection *newsect;
char *name;
name = elf_string_from_elf_strtab (abfd, hdr->sh_name);
switch (hdr->sh_type)
{
case SHT_NULL:
/* inactive section. Throw it away. */
return true;
case SHT_PROGBITS:
case SHT_DYNAMIC:
/* Bits that get saved. This one is real. */
if (hdr->rawdata == NULL)
{
newsect = bfd_make_section_anyway (abfd, name);
if (newsect == NULL)
return false;
newsect->filepos = hdr->sh_offset;
newsect->flags |= SEC_HAS_CONTENTS;
newsect->vma = hdr->sh_addr;
newsect->_raw_size = hdr->sh_size;
newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
if (hdr->sh_flags & SHF_ALLOC)
{
newsect->flags |= SEC_ALLOC;
newsect->flags |= SEC_LOAD;
}
if (!(hdr->sh_flags & SHF_WRITE))
newsect->flags |= SEC_READONLY;
if (hdr->sh_flags & SHF_EXECINSTR)
newsect->flags |= SEC_CODE; /* FIXME: may only contain SOME code */
else if (newsect->flags & SEC_ALLOC)
newsect->flags |= SEC_DATA;
/* The debugging sections appear to recognized only by name,
not any sort of flag. */
if (strncmp (name, ".debug", sizeof ".debug" - 1) == 0
|| strncmp (name, ".line", sizeof ".line" - 1) == 0
|| strncmp (name, ".stab", sizeof ".stab" - 1) == 0)
newsect->flags |= SEC_DEBUGGING;
hdr->rawdata = (PTR) newsect;
}
return true;
case SHT_NOBITS:
/* Bits that get saved. This one is real. */
if (hdr->rawdata == NULL)
{
newsect = bfd_make_section_anyway (abfd, name);
if (newsect == NULL)
return false;
newsect->vma = hdr->sh_addr;
newsect->_raw_size = hdr->sh_size;
newsect->filepos = hdr->sh_offset; /* fake */
newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
if (hdr->sh_flags & SHF_ALLOC)
newsect->flags |= SEC_ALLOC;
if (!(hdr->sh_flags & SHF_WRITE))
newsect->flags |= SEC_READONLY;
/* FIXME: This section is empty. Does it really make sense
to set SEC_CODE for it? */
if (hdr->sh_flags & SHF_EXECINSTR)
newsect->flags |= SEC_CODE; /* FIXME: may only contain SOME code */
hdr->rawdata = (PTR) newsect;
}
return true;
case SHT_SYMTAB: /* A symbol table */
if (elf_onesymtab (abfd) == shindex)
return true;
BFD_ASSERT (hdr->sh_entsize == sizeof (Elf_External_Sym));
BFD_ASSERT (elf_onesymtab (abfd) == 0);
elf_onesymtab (abfd) = shindex;
elf_tdata (abfd)->symtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->symtab_hdr;
abfd->flags |= HAS_SYMS;
return true;
case SHT_DYNSYM: /* A dynamic symbol table */
if (elf_dynsymtab (abfd) == shindex)
return true;
BFD_ASSERT (hdr->sh_entsize == sizeof (Elf_External_Sym));
BFD_ASSERT (elf_dynsymtab (abfd) == 0);
elf_dynsymtab (abfd) = shindex;
elf_tdata (abfd)->dynsymtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->dynsymtab_hdr;
abfd->flags |= HAS_SYMS;
return true;
case SHT_STRTAB: /* A string table */
if (hdr->rawdata)
return true;
if (ehdr->e_shstrndx == shindex)
{
elf_tdata (abfd)->shstrtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->shstrtab_hdr;
hdr->rawdata = (PTR) & elf_tdata (abfd)->shstrtab_hdr;
return true;
}
{
unsigned int i;
for (i = 1; i < ehdr->e_shnum; i++)
{
Elf_Internal_Shdr *hdr2 = elf_elfsections (abfd)[i];
if (hdr2->sh_link == shindex)
{
if (! bfd_section_from_shdr (abfd, i))
return false;
if (elf_onesymtab (abfd) == i)
{
elf_tdata (abfd)->strtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->strtab_hdr;
return true;
}
if (elf_dynsymtab (abfd) == i)
{
elf_tdata (abfd)->dynstrtab_hdr = *hdr;
elf_elfsections (abfd)[shindex] = &elf_tdata (abfd)->dynstrtab_hdr;
return true;
}
#if 0 /* Not handling other string tables specially right now. */
hdr2 = elf_elfsections (abfd)[i]; /* in case it moved */
/* We have a strtab for some random other section. */
newsect = (asection *) hdr2->rawdata;
if (!newsect)
break;
hdr->rawdata = (PTR) newsect;
hdr2 = &elf_section_data (newsect)->str_hdr;
*hdr2 = *hdr;
elf_elfsections (abfd)[shindex] = hdr2;
#endif
}
}
}
newsect = bfd_make_section_anyway (abfd, name);
if (newsect == NULL)
return false;
newsect->flags = SEC_HAS_CONTENTS;
hdr->rawdata = (PTR) newsect;
newsect->_raw_size = hdr->sh_size;
newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
newsect->vma = hdr->sh_addr;
newsect->filepos = hdr->sh_offset;
if (hdr->sh_flags & SHF_ALLOC)
newsect->flags |= SEC_ALLOC | SEC_LOAD;
if (!(hdr->sh_flags & SHF_WRITE))
newsect->flags |= SEC_READONLY;
if (hdr->sh_flags & SHF_EXECINSTR)
newsect->flags |= SEC_CODE;
else if (newsect->flags & SEC_ALLOC)
newsect->flags |= SEC_DATA;
/* Check for debugging string tables. */
if (strncmp (name, ".debug", sizeof ".debug" - 1) == 0
|| strncmp (name, ".stab", sizeof ".stab" - 1) == 0)
newsect->flags |= SEC_DEBUGGING;
return true;
case SHT_REL:
case SHT_RELA:
/* *These* do a lot of work -- but build no sections!
The spec says there can be multiple strtabs, but only one symtab,
but there can be lots of REL* sections. */
/* FIXME: The above statement is wrong! There are typically at least
two symbol tables in a dynamically linked executable, ".dynsym"
which is the dynamic linkage symbol table and ".symtab", which is
the "traditional" symbol table. -fnf */
{
asection *target_sect;
Elf_Internal_Shdr *hdr2;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
/* Don't allow REL relocations on a machine that uses RELA and
vice versa. */
/* @@ Actually, the generic ABI does suggest that both might be
used in one file. But the four ABI Processor Supplements I
have access to right now all specify that only one is used on
each of those architectures. It's conceivable that, e.g., a
bunch of absolute 32-bit relocs might be more compact in REL
form even on a RELA machine... */
BFD_ASSERT (!(use_rela_p && (hdr->sh_type == SHT_REL)));
BFD_ASSERT (!(!use_rela_p && (hdr->sh_type == SHT_RELA)));
BFD_ASSERT (hdr->sh_entsize ==
(use_rela_p
? sizeof (Elf_External_Rela)
: sizeof (Elf_External_Rel)));
if (! bfd_section_from_shdr (abfd, hdr->sh_info) /* target */
|| ! bfd_section_from_shdr (abfd, hdr->sh_link)) /* symbol table */
return false;
target_sect = section_from_elf_index (abfd, hdr->sh_info);
if (target_sect == NULL
|| elf_section_data (target_sect) == NULL)
return false;
hdr2 = &elf_section_data (target_sect)->rel_hdr;
*hdr2 = *hdr;
elf_elfsections (abfd)[shindex] = hdr2;
target_sect->reloc_count = hdr->sh_size / hdr->sh_entsize;
target_sect->flags |= SEC_RELOC;
target_sect->relocation = 0;
target_sect->rel_filepos = hdr->sh_offset;
abfd->flags |= HAS_RELOC;
return true;
}
break;
case SHT_HASH:
#if 0
fprintf (stderr, "Dynamic Linking sections not yet supported.\n");
BFD_FAIL ();
#endif
break;
case SHT_NOTE:
#if 0
fprintf (stderr, "Note Sections not yet supported.\n");
BFD_FAIL ();
#endif
break;
case SHT_SHLIB:
#if 0
fprintf (stderr, "SHLIB Sections not supported (and non conforming.)\n");
#endif
return true;
default:
/* Check for any processor-specific section types. */
{
struct elf_backend_data *bed = get_elf_backend_data (abfd);
if (bed->elf_backend_section_from_shdr)
(*bed->elf_backend_section_from_shdr) (abfd, hdr, name);
}
break;
}
return true;
}
boolean
elf_new_section_hook (abfd, sec)
bfd *abfd
;
asection *sec;
{
struct bfd_elf_section_data *sdata;
sdata = (struct bfd_elf_section_data *) bfd_alloc (abfd, sizeof (*sdata));
if (!sdata)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
sec->used_by_bfd = (PTR) sdata;
memset (sdata, 0, sizeof (*sdata));
return true;
}
/* Create a new bfd section from an ELF program header.
Since program segments have no names, we generate a synthetic name
of the form segment<NUM>, where NUM is generally the index in the
program header table. For segments that are split (see below) we
generate the names segment<NUM>a and segment<NUM>b.
Note that some program segments may have a file size that is different than
(less than) the memory size. All this means is that at execution the
system must allocate the amount of memory specified by the memory size,
but only initialize it with the first "file size" bytes read from the
file. This would occur for example, with program segments consisting
of combined data+bss.
To handle the above situation, this routine generates TWO bfd sections
for the single program segment. The first has the length specified by
the file size of the segment, and the second has the length specified
by the difference between the two sizes. In effect, the segment is split
into it's initialized and uninitialized parts.
*/
static boolean
bfd_section_from_phdr (abfd, hdr, index)
bfd *abfd;
Elf_Internal_Phdr *hdr;
int index;
{
asection *newsect;
char *name;
char namebuf[64];
int split;
split = ((hdr->p_memsz > 0) &&
(hdr->p_filesz > 0) &&
(hdr->p_memsz > hdr->p_filesz));
sprintf (namebuf, split ? "segment%da" : "segment%d", index);
name = bfd_alloc (abfd, strlen (namebuf) + 1);
if (!name)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
strcpy (name, namebuf);
newsect = bfd_make_section (abfd, name);
if (newsect == NULL)
return false;
newsect->vma = hdr->p_vaddr;
newsect->_raw_size = hdr->p_filesz;
newsect->filepos = hdr->p_offset;
newsect->flags |= SEC_HAS_CONTENTS;
if (hdr->p_type == PT_LOAD)
{
newsect->flags |= SEC_ALLOC;
newsect->flags |= SEC_LOAD;
if (hdr->p_flags & PF_X)
{
/* FIXME: all we known is that it has execute PERMISSION,
may be data. */
newsect->flags |= SEC_CODE;
}
}
if (!(hdr->p_flags & PF_W))
{
newsect->flags |= SEC_READONLY;
}
if (split)
{
sprintf (namebuf, "segment%db", index);
name = bfd_alloc (abfd, strlen (namebuf) + 1);
if (!name)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
strcpy (name, namebuf);
newsect = bfd_make_section (abfd, name);
if (newsect == NULL)
return false;
newsect->vma = hdr->p_vaddr + hdr->p_filesz;
newsect->_raw_size = hdr->p_memsz - hdr->p_filesz;
if (hdr->p_type == PT_LOAD)
{
newsect->flags |= SEC_ALLOC;
if (hdr->p_flags & PF_X)
newsect->flags |= SEC_CODE;
}
if (!(hdr->p_flags & PF_W))
newsect->flags |= SEC_READONLY;
}
return true;
}
/* Begin processing a given object.
First we validate the file by reading in the ELF header and checking
the magic number. */
static INLINE boolean
elf_file_p (x_ehdrp)
Elf_External_Ehdr *x_ehdrp;
{
return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
&& (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
&& (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
&& (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
}
/* Check to see if the file associated with ABFD matches the target vector
that ABFD points to.
Note that we may be called several times with the same ABFD, but different
target vectors, most of which will not match. We have to avoid leaving
any side effects in ABFD, or any data it points to (like tdata), if the
file does not match the target vector. */
bfd_target *
elf_object_p (abfd)
bfd *abfd;
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_External_Shdr x_shdr; /* Section header table entry, external form */
Elf_Internal_Shdr *i_shdrp = NULL; /* Section header table, internal form */
unsigned int shindex;
char *shstrtab; /* Internal copy of section header stringtab */
struct elf_backend_data *ebd;
struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
struct elf_obj_tdata *new_tdata = NULL;
/* Read in the ELF header in external format. */
if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
{
if (bfd_get_error () != bfd_error_system_call)
goto got_wrong_format_error;
else
goto got_no_match;
}
/* Now check to see if we have a valid ELF file, and one that BFD can
make use of. The magic number must match, the address size ('class')
and byte-swapping must match our XVEC entry, and it must have a
section header table (FIXME: See comments re sections at top of this
file). */
if ((elf_file_p (&x_ehdr) == false) ||
(x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) ||
(x_ehdr.e_ident[EI_CLASS] != ELFCLASS))
goto got_wrong_format_error;
/* Check that file's byte order matches xvec's */
switch (x_ehdr.e_ident[EI_DATA])
{
case ELFDATA2MSB: /* Big-endian */
if (!abfd->xvec->header_byteorder_big_p)
goto got_wrong_format_error;
break;
case ELFDATA2LSB: /* Little-endian */
if (abfd->xvec->header_byteorder_big_p)
goto got_wrong_format_error;
break;
case ELFDATANONE: /* No data encoding specified */
default: /* Unknown data encoding specified */
goto got_wrong_format_error;
}
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
the tdata pointer in the bfd. */
new_tdata = ((struct elf_obj_tdata *)
bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)));
if (new_tdata == NULL)
goto got_no_memory_error;
elf_tdata (abfd) = new_tdata;
/* Now that we know the byte order, swap in the rest of the header */
i_ehdrp = elf_elfheader (abfd);
elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
#if DEBUG & 1
elf_debug_file (i_ehdrp);
#endif
/* If there is no section header table, we're hosed. */
if (i_ehdrp->e_shoff == 0)
goto got_wrong_format_error;
/* As a simple sanity check, verify that the what BFD thinks is the
size of each section header table entry actually matches the size
recorded in the file. */
if (i_ehdrp->e_shentsize != sizeof (x_shdr))
goto got_wrong_format_error;
ebd = get_elf_backend_data (abfd);
/* Check that the ELF e_machine field matches what this particular
BFD format expects. */
if (ebd->elf_machine_code != i_ehdrp->e_machine)
{
bfd_target **target_ptr;
if (ebd->elf_machine_code != EM_NONE)
goto got_wrong_format_error;
/* This is the generic ELF target. Let it match any ELF target
for which we do not have a specific backend. */
for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
{
struct elf_backend_data *back;
if ((*target_ptr)->flavour != bfd_target_elf_flavour)
continue;
back = (struct elf_backend_data *) (*target_ptr)->backend_data;
if (back->elf_machine_code == i_ehdrp->e_machine)
{
/* target_ptr is an ELF backend which matches this
object file, so reject the generic ELF target. */
goto got_wrong_format_error;
}
}
}
/* Set the flags and architecture before calling the backend so that
it can override them. */
if (i_ehdrp->e_type == ET_EXEC)
abfd->flags |= EXEC_P;
else if (i_ehdrp->e_type == ET_DYN)
abfd->flags |= DYNAMIC;
if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
goto got_no_match;
/* Remember the entry point specified in the ELF file header. */
bfd_get_start_address (abfd) = i_ehdrp->e_entry;
/* Let the backend double check the format and override global
information. */
if (ebd->elf_backend_object_p)
{
if ((*ebd->elf_backend_object_p) (abfd) == false)
goto got_wrong_format_error;
}
/* Allocate space for a copy of the section header table in
internal form, seek to the section header table in the file,
read it in, and convert it to internal form. */
i_shdrp = ((Elf_Internal_Shdr *)
bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum));
elf_elfsections (abfd) = ((Elf_Internal_Shdr **)
bfd_alloc (abfd,
sizeof (i_shdrp) * i_ehdrp->e_shnum));
if (!i_shdrp || !elf_elfsections (abfd))
goto got_no_memory_error;
if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) != 0)
goto got_no_match;
for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
{
if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr))
goto got_no_match;
elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
elf_elfsections (abfd)[shindex] = i_shdrp + shindex;
/* If this is a .dynamic section, mark the object file as being
dynamically linked. */
if (i_shdrp[shindex].sh_type == SHT_DYNAMIC)
abfd->flags |= DYNAMIC;
}
if (i_ehdrp->e_shstrndx)
{
if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
goto got_no_match;
}
/* Read in the string table containing the names of the sections. We
will need the base pointer to this table later. */
/* We read this inline now, so that we don't have to go through
bfd_section_from_shdr with it (since this particular strtab is
used to find all of the ELF section names.) */
shstrtab = elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
if (!shstrtab)
goto got_no_match;
/* Once all of the section headers have been read and converted, we
can start processing them. Note that the first section header is
a dummy placeholder entry, so we ignore it. */
for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
{
if (! bfd_section_from_shdr (abfd, shindex))
goto got_no_match;
}
return (abfd->xvec);
got_wrong_format_error:
bfd_set_error (bfd_error_wrong_format);
goto got_no_match;
got_no_memory_error:
bfd_set_error (bfd_error_no_memory);
goto got_no_match;
got_no_match:
if (new_tdata != NULL
&& new_tdata->elf_sect_ptr != NULL)
bfd_release (abfd, new_tdata->elf_sect_ptr);
if (i_shdrp != NULL)
bfd_release (abfd, i_shdrp);
if (new_tdata != NULL)
bfd_release (abfd, new_tdata);
elf_tdata (abfd) = preserved_tdata;
return (NULL);
}
/* ELF .o/exec file writing */
/* Takes a bfd and a symbol, returns a pointer to the elf specific area
of the symbol if there is one. */
static INLINE elf_symbol_type *
elf_symbol_from (ignore_abfd, symbol)
bfd *ignore_abfd;
asymbol *symbol;
{
if (symbol->the_bfd->xvec->flavour != bfd_target_elf_flavour)
return 0;
if (symbol->the_bfd->tdata.elf_obj_data == (struct elf_obj_tdata *) NULL)
return 0;
return (elf_symbol_type *) symbol;
}
/* Create ELF output from BFD sections.
Essentially, just create the section header and forget about the program
header for now. */
static void
elf_make_sections (abfd, asect, obj)
bfd *abfd;
asection *asect;
PTR obj;
{
/* most of what is in bfd_shdr_from_section goes in here... */
/* and all of these sections generate at *least* one ELF section. */
Elf_Internal_Shdr *this_hdr;
this_hdr = &elf_section_data (asect)->this_hdr;
this_hdr->sh_addr = asect->vma;
this_hdr->sh_size = asect->_raw_size;
/* contents already set by elf_set_section_contents */
if (asect->flags & SEC_RELOC)
{
/* emit a reloc section, and thus strtab and symtab... */
Elf_Internal_Shdr *rela_hdr;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
rela_hdr = &elf_section_data (asect)->rel_hdr;
/* orelocation has the data, reloc_count has the count... */
if (use_rela_p)
{
rela_hdr->sh_type = SHT_RELA;
rela_hdr->sh_entsize = sizeof (Elf_External_Rela);
}
else
/* REL relocations */
{
rela_hdr->sh_type = SHT_REL;
rela_hdr->sh_entsize = sizeof (Elf_External_Rel);
}
rela_hdr->sh_flags = 0;
rela_hdr->sh_addr = 0;
rela_hdr->sh_offset = 0;
/* FIXME: Systems I've checked use an alignment of 4, but it is
possible that some systems use a different alignment. */
rela_hdr->sh_addralign = 4;
rela_hdr->size = 0;
}
if (asect->flags & SEC_ALLOC)
{
this_hdr->sh_flags |= SHF_ALLOC;
if (asect->flags & SEC_LOAD)
{
/* @@ Do something with sh_type? */
}
}
else
{
/* If this section is not part of the program image during
execution, leave the address fields at 0. */
this_hdr->sh_addr = 0;
asect->vma = 0;
}
if (!(asect->flags & SEC_READONLY))
this_hdr->sh_flags |= SHF_WRITE;
if (asect->flags & SEC_CODE)
this_hdr->sh_flags |= SHF_EXECINSTR;
}
void
write_relocs (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
Elf_Internal_Shdr *rela_hdr;
Elf_External_Rela *outbound_relocas;
Elf_External_Rel *outbound_relocs;
int idx;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
asymbol *last_sym = 0;
int last_sym_idx = 9999999; /* should always be written before use */
if ((sec->flags & SEC_RELOC) == 0)
return;
/* The linker backend writes the relocs out itself, and sets the
reloc_count field to zero to inhibit writing them here. Also,
sometimes the SEC_RELOC flag gets set even when there aren't any
relocs. */
if (sec->reloc_count == 0)
return;
rela_hdr = &elf_section_data (sec)->rel_hdr;
rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
rela_hdr->contents = (void *) bfd_alloc (abfd, rela_hdr->sh_size);
if (!rela_hdr->contents)
{
bfd_set_error (bfd_error_no_memory);
abort (); /* FIXME */
}
/* orelocation has the data, reloc_count has the count... */
if (use_rela_p)
{
outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
for (idx = 0; idx < sec->reloc_count; idx++)
{
Elf_Internal_Rela dst_rela;
Elf_External_Rela *src_rela;
arelent *ptr;
asymbol *sym;
int n;
ptr = sec->orelocation[idx];
src_rela = outbound_relocas + idx;
if (!(abfd->flags & EXEC_P))
dst_rela.r_offset = ptr->address - sec->vma;
else
dst_rela.r_offset = ptr->address;
sym = *ptr->sym_ptr_ptr;
if (sym == last_sym)
n = last_sym_idx;
else
{
last_sym = sym;
last_sym_idx = n = elf_symbol_from_bfd_symbol (abfd, &sym);
}
dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
dst_rela.r_addend = ptr->addend;
elf_swap_reloca_out (abfd, &dst_rela, src_rela);
}
}
else
/* REL relocations */
{
outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
for (idx = 0; idx < sec->reloc_count; idx++)
{
Elf_Internal_Rel dst_rel;
Elf_External_Rel *src_rel;
arelent *ptr;
int n;
asymbol *sym;
ptr = sec->orelocation[idx];
sym = *ptr->sym_ptr_ptr;
src_rel = outbound_relocs + idx;
if (!(abfd->flags & EXEC_P))
dst_rel.r_offset = ptr->address - sec->vma;
else
dst_rel.r_offset = ptr->address;
if (sym == last_sym)
n = last_sym_idx;
else
{
last_sym = sym;
last_sym_idx = n = elf_symbol_from_bfd_symbol (abfd, &sym);
}
dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
elf_swap_reloc_out (abfd, &dst_rel, src_rel);
}
}
}
static void
fix_up_strtabs (abfd, asect, obj)
bfd *abfd;
asection *asect;
PTR obj;
{
Elf_Internal_Shdr *this_hdr = &elf_section_data (asect)->this_hdr;
int this_idx = elf_section_data (asect)->this_idx;
/* @@ Check flags! */
if (!strncmp (asect->name, ".stab", 5)
&& !strcmp ("str", asect->name + strlen (asect->name) - 3))
{
size_t len = strlen (asect->name) + 1;
char *s = (char *) malloc (len);
if (s == NULL)
/* FIXME: Should deal more gracefully with errors. */
abort ();
strcpy (s, asect->name);
s[len - 4] = 0;
asect = bfd_get_section_by_name (abfd, s);
free (s);
if (!asect)
abort ();
elf_section_data (asect)->this_hdr.sh_link = this_idx;
/* @@ Assuming 32 bits! */
elf_section_data (asect)->this_hdr.sh_entsize = 0xc;
this_hdr->sh_type = SHT_STRTAB;
}
}
static void
elf_fake_sections (abfd, asect, obj)
bfd *abfd;
asection *asect;
PTR obj;
{
/* most of what is in bfd_shdr_from_section goes in here... */
/* and all of these sections generate at *least* one ELF section. */
Elf_Internal_Shdr *this_hdr;
this_hdr = &elf_section_data (asect)->this_hdr;
this_hdr->sh_name =
bfd_add_to_strtab (abfd, elf_shstrtab (abfd), asect->name);
if (this_hdr->sh_name == (unsigned long) -1)
abort (); /* FIXME */
/* We need to log the type *now* so that elf_section_from_bfd_section
can find us... have to set rawdata too. */
this_hdr->rawdata = (void *) asect;
this_hdr->sh_addralign = 1 << asect->alignment_power;
if ((asect->flags & SEC_ALLOC) && (asect->flags & SEC_LOAD))
this_hdr->sh_type = SHT_PROGBITS;
else if ((asect->flags & SEC_ALLOC) && ((asect->flags & SEC_LOAD) == 0))
{
BFD_ASSERT (strcmp (asect->name, ".bss") == 0
|| strcmp (asect->name, ".sbss") == 0);
this_hdr->sh_type = SHT_NOBITS;
}
/* FIXME I am not sure how to detect a .note section from the flags
word of an `asection'. */
else if (!strcmp (asect->name, ".note"))
this_hdr->sh_type = SHT_NOTE;
else
this_hdr->sh_type = SHT_PROGBITS;
this_hdr->sh_flags = 0;
this_hdr->sh_addr = 0;
this_hdr->sh_size = 0;
this_hdr->sh_entsize = 0;
this_hdr->sh_info = 0;
this_hdr->sh_link = 0;
this_hdr->sh_offset = 0;
this_hdr->size = 0;
/* Now, check for processor-specific section types. */
{
struct elf_backend_data *bed = get_elf_backend_data (abfd);
if (bed->elf_backend_fake_sections)
(*bed->elf_backend_fake_sections) (abfd, this_hdr, asect);
}
{
/* Emit a strtab and symtab, and possibly a reloc section. */
Elf_Internal_Shdr *rela_hdr;
/* Note that only one symtab is used, so just remember it
for now. */
if (asect->flags & SEC_RELOC)
{
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
rela_hdr = &elf_section_data (asect)->rel_hdr;
rela_hdr->sh_name =
bfd_add_2_to_strtab (abfd, elf_shstrtab (abfd),
use_rela_p ? ".rela" : ".rel",
asect->name);
rela_hdr->sh_type = use_rela_p ? SHT_RELA : SHT_REL;
rela_hdr->sh_entsize = (use_rela_p
? sizeof (Elf_External_Rela)
: sizeof (Elf_External_Rel));
rela_hdr->sh_flags = 0;
rela_hdr->sh_addr = 0;
rela_hdr->sh_size = 0;
rela_hdr->sh_offset = 0;
/* FIXME: Systems I've checked use an alignment of 4, but some
systems may use a different alignment. */
rela_hdr->sh_addralign = 4;
rela_hdr->size = 0;
}
}
if (asect->flags & SEC_ALLOC)
{
this_hdr->sh_flags |= SHF_ALLOC;
if (asect->flags & SEC_LOAD)
{
/* @@ Do something with sh_type? */
}
}
if (!(asect->flags & SEC_READONLY))
this_hdr->sh_flags |= SHF_WRITE;
if (asect->flags & SEC_CODE)
this_hdr->sh_flags |= SHF_EXECINSTR;
}
/* Map symbol from it's internal number to the external number, moving
all local symbols to be at the head of the list. */
static INLINE int
sym_is_global (abfd, sym)
bfd *abfd;
asymbol *sym;
{
/* If the backend has a special mapping, use it. */
if (get_elf_backend_data (abfd)->elf_backend_sym_is_global)
return ((*get_elf_backend_data (abfd)->elf_backend_sym_is_global)
(abfd, sym));
if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
{
if (sym->flags & BSF_LOCAL)
abort ();
return 1;
}
if (sym->section == 0)
{
/* Is this valid? */
abort ();
return 1;
}
if (sym->section == &bfd_und_section)
return 1;
if (bfd_is_com_section (sym->section))
return 1;
if (sym->flags & (BSF_LOCAL | BSF_SECTION_SYM | BSF_FILE))
return 0;
return 0;
}
static boolean
elf_map_symbols (abfd)
bfd *abfd;
{
int symcount = bfd_get_symcount (abfd);
asymbol **syms = bfd_get_outsymbols (abfd);
asymbol **sect_syms;
int num_locals = 0;
int num_globals = 0;
int num_locals2 = 0;
int num_globals2 = 0;
int max_index = 0;
int num_sections = 0;
Elf_Sym_Extra *sym_extra;
int idx;
asection *asect;
#ifdef DEBUG
fprintf (stderr, "elf_map_symbols\n");
fflush (stderr);
#endif
/* Add local symbols for each section for which there are relocs.
FIXME: How can we tell which sections have relocs at this point?
Will reloc_count always be accurate? Actually, I think most ELF
targets create section symbols for all sections anyhow. */
for (asect = abfd->sections; asect; asect = asect->next)
{
if (max_index < asect->index)
max_index = asect->index;
}
max_index++;
elf_num_section_syms (abfd) = max_index;
sect_syms = (asymbol **) bfd_zalloc (abfd, max_index * sizeof (asymbol *));
elf_section_syms (abfd) = sect_syms;
if (sect_syms == 0)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
for (asect = abfd->sections; asect; asect = asect->next)
{
asymbol *sym = bfd_make_empty_symbol (abfd);
if (!sym)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
sym->the_bfd = abfd;
sym->name = asect->name;
sym->value = asect->vma;
sym->flags = BSF_SECTION_SYM;
sym->section = asect;
sect_syms[asect->index] = sym;
num_sections++;
#ifdef DEBUG
fprintf (stderr,
"creating section symbol, name = %s, value = 0x%.8lx, index = %d, section = 0x%.8lx\n",
asect->name, (long) asect->vma, asect->index, (long) asect);
#endif
}
if (num_sections)
{
if (syms)
syms = (asymbol **) bfd_realloc (abfd, syms,
((symcount + num_sections + 1)
* sizeof (asymbol *)));
else
syms = (asymbol **) bfd_alloc (abfd,
(num_sections + 1) * sizeof (asymbol *));
if (!syms)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
for (asect = abfd->sections; asect; asect = asect->next)
{
if (sect_syms[asect->index])
syms[symcount++] = sect_syms[asect->index];
}
syms[symcount] = (asymbol *) 0;
bfd_set_symtab (abfd, syms, symcount);
}
elf_sym_extra (abfd) = sym_extra
= (Elf_Sym_Extra *) bfd_alloc (abfd, symcount * sizeof (Elf_Sym_Extra));
if (!sym_extra)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
/* Identify and classify all of the symbols. */
for (idx = 0; idx < symcount; idx++)
{
if (!sym_is_global (abfd, syms[idx]))
num_locals++;
else
num_globals++;
}
/* Now provide mapping information. Add +1 for skipping over the
dummy symbol. */
for (idx = 0; idx < symcount; idx++)
{
syms[idx]->udata = (PTR) & sym_extra[idx];
if (!sym_is_global (abfd, syms[idx]))
sym_extra[idx].elf_sym_num = 1 + num_locals2++;
else
sym_extra[idx].elf_sym_num = 1 + num_locals + num_globals2++;
}
elf_num_locals (abfd) = num_locals;
elf_num_globals (abfd) = num_globals;
return true;
}
/* Compute the file positions we are going to put the sections at, and
otherwise prepare to begin writing out the ELF file. If LINK_INFO
is not NULL, this is being called by the ELF backend linker. */
static boolean
elf_compute_section_file_positions (abfd, link_info)
bfd *abfd;
struct bfd_link_info *link_info;
{
struct elf_backend_data *bed = get_elf_backend_data (abfd);
Elf_Internal_Shdr *shstrtab_hdr;
if (abfd->output_has_begun)
return true;
/* Do any elf backend specific processing first. */
if (bed->elf_backend_begin_write_processing)
(*bed->elf_backend_begin_write_processing) (abfd);
if (! prep_headers (abfd))
return false;
bfd_map_over_sections (abfd, elf_fake_sections, 0);
if (!assign_section_numbers (abfd))
return false;
bfd_map_over_sections (abfd, elf_make_sections, 0);
bfd_map_over_sections (abfd, fix_up_strtabs, 0); /* .stab/.stabstr &c */
/* The backend linker builds symbol table information itself. */
if (link_info == NULL)
{
if (! swap_out_syms (abfd))
return false;
}
shstrtab_hdr = &elf_tdata (abfd)->shstrtab_hdr;
/* sh_name was set in prep_headers. */
shstrtab_hdr->sh_type = SHT_STRTAB;
shstrtab_hdr->sh_flags = 0;
shstrtab_hdr->sh_addr = 0;
shstrtab_hdr->sh_size = elf_shstrtab (abfd)->length;
shstrtab_hdr->sh_entsize = 0;
shstrtab_hdr->sh_link = 0;
shstrtab_hdr->sh_info = 0;
/* sh_offset is set in assign_file_positions_for_symtabs_and_strtabs. */
shstrtab_hdr->sh_addralign = 1;
shstrtab_hdr->contents = (PTR) elf_shstrtab (abfd)->tab;
if (!assign_file_positions_except_relocs (abfd,
link_info == NULL ? true : false))
return false;
abfd->output_has_begun = true;
return true;
}
static boolean
elf_write_phdrs (abfd, i_ehdrp, i_phdrp, phdr_cnt)
bfd *abfd;
Elf_Internal_Ehdr *i_ehdrp;
Elf_Internal_Phdr *i_phdrp;
unsigned short phdr_cnt;
{
/* first program header entry goes after the file header */
int outbase = i_ehdrp->e_phoff;
unsigned int i;
Elf_External_Phdr x_phdr;
for (i = 0; i < phdr_cnt; i++)
{
elf_swap_phdr_out (abfd, i_phdrp + i, &x_phdr);
if (bfd_seek (abfd, outbase, SEEK_SET) != 0
|| (bfd_write ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd)
!= sizeof (x_phdr)))
return false;
outbase += sizeof (x_phdr);
}
return true;
}
/* Assign all ELF section numbers. The dummy first section is handled here
too. The link/info pointers for the standard section types are filled
in here too, while we're at it. (Link pointers for .stab sections are
not filled in here.) */
static boolean
assign_section_numbers (abfd)
bfd *abfd;
{
struct elf_obj_tdata *t = elf_tdata (abfd);
asection *sec;
int section_number = 1;
int i;
Elf_Internal_Shdr **i_shdrp;
t->shstrtab_hdr.sh_size = elf_shstrtab (abfd)->length;
t->shstrtab_hdr.contents = (void *) elf_shstrtab (abfd)->tab;
t->shstrtab_section = section_number++;
elf_elfheader (abfd)->e_shstrndx = t->shstrtab_section;
if (abfd->symcount)
{
t->symtab_section = section_number++;
t->strtab_section = section_number++;
t->symtab_hdr.sh_link = t->strtab_section;
}
for (sec = abfd->sections; sec; sec = sec->next)
{
struct bfd_elf_section_data *d = elf_section_data (sec);
d->this_idx = section_number++;
if (sec->flags & SEC_RELOC)
{
d->rel_idx = section_number++;
d->rel_hdr.sh_link = t->symtab_section;
d->rel_hdr.sh_info = d->this_idx;
}
else
d->rel_idx = 0;
/* No handling for per-section string tables currently. */
}
elf_elfheader (abfd)->e_shnum = section_number;
/* Set up the list of section header pointers, in agreement with the
indices. */
i_shdrp = ((Elf_Internal_Shdr **)
bfd_alloc (abfd, section_number * sizeof (Elf_Internal_Shdr *)));
if (i_shdrp == NULL)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
i_shdrp[0] = ((Elf_Internal_Shdr *)
bfd_alloc (abfd, sizeof (Elf_Internal_Shdr)));
if (i_shdrp[0] == NULL)
{
bfd_release (abfd, i_shdrp);
bfd_set_error (bfd_error_no_memory);
return false;
}
elf_elfsections (abfd) = i_shdrp;
for (i = 1; i < section_number; i++)
i_shdrp[i] = NULL;
memset (i_shdrp[0], 0, sizeof (Elf_Internal_Shdr));
i_shdrp[t->shstrtab_section] = &t->shstrtab_hdr;
if (abfd->symcount)
{
i_shdrp[t->symtab_section] = &t->symtab_hdr;
i_shdrp[t->strtab_section] = &t->strtab_hdr;
}
for (sec = abfd->sections; sec; sec = sec->next)
{
struct bfd_elf_section_data *d = elf_section_data (sec);
i_shdrp[d->this_idx] = &d->this_hdr;
if (d->rel_idx)
i_shdrp[d->rel_idx] = &d->rel_hdr;
}
/* Make sure we got everything.... */
for (i = 0; i < section_number; i++)
if (i_shdrp[i] == NULL)
abort ();
return true;
}
static INLINE file_ptr
assign_file_position_for_section (i_shdrp, offset)
Elf_Internal_Shdr *i_shdrp;
file_ptr offset;
{
int align;
if (i_shdrp->sh_addralign != 0)
align = i_shdrp->sh_addralign;
else
align = 1;
i_shdrp->sh_offset = offset = BFD_ALIGN (offset, align);
if (i_shdrp->rawdata != NULL)
((asection *) i_shdrp->rawdata)->filepos = offset;
if (i_shdrp->sh_type != SHT_NOBITS)
offset += i_shdrp->sh_size;
return offset;
}
static INLINE file_ptr
align_file_position (off)
file_ptr off;
{
return (off + FILE_ALIGN - 1) & ~(FILE_ALIGN - 1);
}
static INLINE file_ptr
assign_file_positions_for_symtab_and_strtabs (abfd, off, dosyms)
bfd *abfd;
file_ptr off;
boolean dosyms;
{
struct elf_obj_tdata *t = elf_tdata (abfd);
off = align_file_position (off);
if (dosyms)
off = assign_file_position_for_section (&t->symtab_hdr, off);
off = assign_file_position_for_section (&t->shstrtab_hdr, off);
if (dosyms)
off = assign_file_position_for_section (&t->strtab_hdr, off);
return off;
}
struct seg_info
{
bfd_vma low, mem_size;
file_ptr file_size;
int start_pos;
int sh_flags;
struct seg_info *next;
};
static boolean
map_program_segments (abfd)
bfd *abfd;
{
Elf_Internal_Shdr **i_shdrpp = elf_elfsections (abfd);
Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
Elf_Internal_Shdr *i_shdrp;
Elf_Internal_Phdr *phdr;
char *done = NULL;
unsigned int i, n_left = 0;
file_ptr lowest_offset = 0;
struct seg_info *seg = NULL;
done = (char *) malloc (i_ehdrp->e_shnum);
if (done == NULL && i_ehdrp->e_shnum != 0)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
memset (done, 0, i_ehdrp->e_shnum);
for (i = 1; i < i_ehdrp->e_shnum; i++)
{
i_shdrp = i_shdrpp[i];
/* If it's going to be mapped in, it's been assigned a position. */
if (i_shdrp->sh_offset + 1 == 0)
{
/* Well, not really, but we won't process it here. */
done[i] = 1;
continue;
}
if (i_shdrp->sh_offset < lowest_offset
|| lowest_offset == 0)
lowest_offset = i_shdrp->sh_offset;
/* Only interested in PROGBITS or NOBITS for generating segments. */
switch (i_shdrp->sh_type)
{
case SHT_PROGBITS:
case SHT_NOBITS:
break;
default:
done[i] = 1;
}
if (!done[i])
n_left++;
}
while (n_left)
{
bfd_vma lowest_vma = -1, high;
int low_sec = 0;
int mem_size;
int file_size = 0;
struct seg_info *snew;
struct seg_info **s_ptr;
for (i = 1; i < i_ehdrp->e_shnum; i++)
{
i_shdrp = i_shdrpp[i];
if (!done[i] && i_shdrp->sh_addr < lowest_vma)
{
lowest_vma = i_shdrp->sh_addr;
low_sec = i;
}
}
if (low_sec == 0)
abort ();
/* So now we know the lowest vma of any unassigned sections; start
a segment there. */
snew = (struct seg_info *) bfd_alloc (abfd, sizeof (struct seg_info));
if (!snew)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
s_ptr = &seg;
while (*s_ptr != (struct seg_info *) NULL)
s_ptr = &(*s_ptr)->next;
*s_ptr = snew;
snew->next = NULL;
snew->low = lowest_vma;
i_shdrp = i_shdrpp[low_sec];
snew->start_pos = i_shdrp->sh_offset;
snew->sh_flags = i_shdrp->sh_flags;
done[low_sec] = 1, n_left--;
mem_size = i_shdrp->sh_size;
high = lowest_vma + i_shdrp->sh_size;
if (i_shdrp->sh_type == SHT_PROGBITS)
file_size = i_shdrp->sh_size;
for (i = 1; i < i_ehdrp->e_shnum; i++)
{
file_ptr f1;
if (done[i])
continue;
i_shdrp = i_shdrpp[i];
/* position of next byte on disk */
f1 = snew->start_pos + file_size;
if (i_shdrp->sh_type == SHT_PROGBITS)
{
if (i_shdrp->sh_offset - f1 != i_shdrp->sh_addr - high)
continue;
if (file_size != mem_size)
break;
}
else
/* sh_type == NOBITS */
{
/* If the section in question has no contents in the disk
file, we really don't care where it supposedly starts.
But we don't want to bother merging it into this segment
if it doesn't start on this memory page. */
bfd_vma page1, page2;
bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
/* page number in address space of current end of snew */
page1 = (high - 1 + maxpagesize - 1) / maxpagesize;
/* page number in address space of start of this section */
page2 = (i_shdrp->sh_addr + maxpagesize - 1) / maxpagesize;
if (page1 != page2)
continue;
}
done[i] = 1, n_left--;
if (i_shdrp->sh_type == SHT_PROGBITS)
file_size = i_shdrp->sh_offset + i_shdrp->sh_size - snew->start_pos;
mem_size = i_shdrp->sh_addr + i_shdrp->sh_size - snew->low;
high = i_shdrp->sh_addr + i_shdrp->sh_size;
i = 0;
}
snew->file_size = file_size;
snew->mem_size = mem_size;
}
/* Now do something with the list of segments we've built up. */
{
bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
struct seg_info *s;
int n_segs = 0;
int sz;
for (s = seg; s; s = s->next)
{
n_segs++;
}
i_ehdrp->e_phentsize = sizeof (Elf_External_Phdr);
sz = sizeof (Elf_External_Phdr) * n_segs;
if (align_file_position (i_ehdrp->e_ehsize) + sz <= lowest_offset)
i_ehdrp->e_phoff = align_file_position (i_ehdrp->e_ehsize);
else
{
i_ehdrp->e_phoff = align_file_position (elf_tdata (abfd)->next_file_pos);
elf_tdata (abfd)->next_file_pos = i_ehdrp->e_phoff + sz;
}
phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd,
n_segs * sizeof (Elf_Internal_Phdr));
if (!phdr)
{
bfd_set_error (bfd_error_no_memory);
abort (); /* FIXME */
}
elf_tdata (abfd)->phdr = phdr;
while (seg)
{
phdr->p_type = PT_LOAD; /* only type we really support so far */
phdr->p_offset = seg->start_pos;
phdr->p_vaddr = seg->low;
phdr->p_paddr = 0;
phdr->p_filesz = seg->file_size;
phdr->p_memsz = seg->mem_size;
phdr->p_flags = PF_R;
phdr->p_align = maxpagesize; /* ? */
if (seg->sh_flags & SHF_WRITE)
/* SysVr4 ELF docs say "data segments normally have read, write,
and execute permissions." */
phdr->p_flags |= (PF_W | PF_X);
if (seg->sh_flags & SHF_EXECINSTR)
phdr->p_flags |= PF_X;
phdr++;
seg = seg->next;
}
i_ehdrp->e_phnum = n_segs;
}
elf_write_phdrs (abfd, i_ehdrp, elf_tdata (abfd)->phdr, i_ehdrp->e_phnum);
if (done != NULL)
free (done);
return true;
error_return:
if (done != NULL)
free (done);
return false;
}
static boolean
assign_file_positions_except_relocs (abfd, dosyms)
bfd *abfd;
boolean dosyms;
{
/* For now, we ignore the possibility of having program segments, which
may require some alignment in the file. That'll require padding, and
some interesting calculations to optimize file space usage.
Also, since the application may change the list of relocations for
a given section, we don't figure them in here. We'll put them at the
end of the file, at positions computed during bfd_close.
The order, for now: <ehdr> <shdr> <sec1> <sec2> <sec3> ... <rel1> ...
or: <ehdr> <phdr> <sec1> <sec2> ... <shdr> <rel1> ... */
struct elf_obj_tdata *t = elf_tdata (abfd);
file_ptr off;
unsigned int i;
Elf_Internal_Shdr **i_shdrpp = elf_elfsections (abfd);
Elf_Internal_Shdr *i_shdrp;
Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
int exec_p = (abfd->flags & EXEC_P) != 0;
bfd_vma maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
/* Everything starts after the ELF file header. */
off = i_ehdrp->e_ehsize;
if (!exec_p)
{
/* Section headers. */
off = align_file_position (off);
i_ehdrp->e_shoff = off;
off += i_ehdrp->e_shnum * i_ehdrp->e_shentsize;
off = assign_file_positions_for_symtab_and_strtabs (abfd, off, dosyms);
}
for (i = 1; i < i_ehdrp->e_shnum; i++)
{
/* The symtab and strtab sections are placed by
assign_file_positions_for_symtab_and_strtabs. */
if (i == t->symtab_section
|| i == t->strtab_section
|| i == t->shstrtab_section)
continue;
i_shdrp = i_shdrpp[i];
if (i_shdrp->sh_type == SHT_REL || i_shdrp->sh_type == SHT_RELA)
{
i_shdrp->sh_offset = -1;
continue;
}
if (exec_p)
{
if (maxpagesize == 0)
maxpagesize = 1; /* make the arithmetic work */
/* This isn't necessarily going to give the best packing, if the
segments require padding between them, but since that isn't
usually the case, this'll do. */
if ((i_shdrp->sh_flags & SHF_ALLOC) == 0)
{
i_shdrp->sh_offset = -1;
continue;
}
/* Blindly assume that the segments are ordered optimally. With
the default LD script, they will be. */
if (i_shdrp->sh_type != SHT_NOBITS)
{
/* need big unsigned type */
bfd_vma addtl_off;
addtl_off = i_shdrp->sh_addr - off;
addtl_off = addtl_off % maxpagesize;
if (addtl_off)
{
off += addtl_off;
}
}
}
off = assign_file_position_for_section (i_shdrp, off);
if (exec_p
&& (abfd->flags & D_PAGED) != 0
&& get_elf_backend_data (abfd)->maxpagesize > 1
&& i_shdrp->sh_type == SHT_PROGBITS
&& (i_shdrp->sh_flags & SHF_ALLOC)
&& (i_shdrp->sh_offset - i_shdrp->sh_addr) % get_elf_backend_data (abfd)->maxpagesize != 0)
abort ();
}
if (exec_p)
{
elf_tdata (abfd)->next_file_pos = off;
if (!map_program_segments (abfd))
return false;
off = elf_tdata (abfd)->next_file_pos;
/* Section headers. */
off = align_file_position (off);
i_ehdrp->e_shoff = off;
off += i_ehdrp->e_shnum * i_ehdrp->e_shentsize;
off = assign_file_positions_for_symtab_and_strtabs (abfd, off, dosyms);
for (i = 1; i < i_ehdrp->e_shnum; i++)
{
i_shdrp = i_shdrpp[i];
if (i_shdrp->sh_offset + 1 == 0
&& i_shdrp->sh_type != SHT_REL
&& i_shdrp->sh_type != SHT_RELA)
off = assign_file_position_for_section (i_shdrp, off);
}
}
elf_tdata (abfd)->next_file_pos = off;
return true;
}
static boolean
prep_headers (abfd)
bfd *abfd;
{
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_Internal_Phdr *i_phdrp = 0; /* Program header table, internal form */
Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
int count;
struct strtab *shstrtab;
i_ehdrp = elf_elfheader (abfd);
i_shdrp = elf_elfsections (abfd);
shstrtab = bfd_new_strtab (abfd);
if (!shstrtab)
return false;
elf_shstrtab (abfd) = shstrtab;
i_ehdrp->e_ident[EI_MAG0] = ELFMAG0;
i_ehdrp->e_ident[EI_MAG1] = ELFMAG1;
i_ehdrp->e_ident[EI_MAG2] = ELFMAG2;
i_ehdrp->e_ident[EI_MAG3] = ELFMAG3;
i_ehdrp->e_ident[EI_CLASS] = ELFCLASS;
i_ehdrp->e_ident[EI_DATA] =
abfd->xvec->byteorder_big_p ? ELFDATA2MSB : ELFDATA2LSB;
i_ehdrp->e_ident[EI_VERSION] = EV_CURRENT;
for (count = EI_PAD; count < EI_NIDENT; count++)
i_ehdrp->e_ident[count] = 0;
i_ehdrp->e_type = (abfd->flags & EXEC_P) ? ET_EXEC : ET_REL;
switch (bfd_get_arch (abfd))
{
case bfd_arch_unknown:
i_ehdrp->e_machine = EM_NONE;
break;
case bfd_arch_sparc:
i_ehdrp->e_machine = EM_SPARC;
break;
case bfd_arch_i386:
i_ehdrp->e_machine = EM_386;
break;
case bfd_arch_m68k:
i_ehdrp->e_machine = EM_68K;
break;
case bfd_arch_m88k:
i_ehdrp->e_machine = EM_88K;
break;
case bfd_arch_i860:
i_ehdrp->e_machine = EM_860;
break;
case bfd_arch_mips: /* MIPS Rxxxx */
i_ehdrp->e_machine = EM_MIPS; /* only MIPS R3000 */
break;
case bfd_arch_hppa:
i_ehdrp->e_machine = EM_HPPA;
break;
case bfd_arch_powerpc:
i_ehdrp->e_machine = EM_CYGNUS_POWERPC;
break;
/* also note that EM_M32, AT&T WE32100 is unknown to bfd */
default:
i_ehdrp->e_machine = EM_NONE;
}
i_ehdrp->e_version = EV_CURRENT;
i_ehdrp->e_ehsize = sizeof (Elf_External_Ehdr);
/* no program header, for now. */
i_ehdrp->e_phoff = 0;
i_ehdrp->e_phentsize = 0;
i_ehdrp->e_phnum = 0;
/* each bfd section is section header entry */
i_ehdrp->e_entry = bfd_get_start_address (abfd);
i_ehdrp->e_shentsize = sizeof (Elf_External_Shdr);
/* if we're building an executable, we'll need a program header table */
if (abfd->flags & EXEC_P)
{
/* it all happens later */
#if 0
i_ehdrp->e_phentsize = sizeof (Elf_External_Phdr);
/* elf_build_phdrs() returns a (NULL-terminated) array of
Elf_Internal_Phdrs */
i_phdrp = elf_build_phdrs (abfd, i_ehdrp, i_shdrp, &i_ehdrp->e_phnum);
i_ehdrp->e_phoff = outbase;
outbase += i_ehdrp->e_phentsize * i_ehdrp->e_phnum;
#endif
}
else
{
i_ehdrp->e_phentsize = 0;
i_phdrp = 0;
i_ehdrp->e_phoff = 0;
}
elf_tdata (abfd)->symtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
".symtab");
elf_tdata (abfd)->strtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
".strtab");
elf_tdata (abfd)->shstrtab_hdr.sh_name = bfd_add_to_strtab (abfd, shstrtab,
".shstrtab");
if (elf_tdata (abfd)->symtab_hdr.sh_name == (unsigned int) -1
|| elf_tdata (abfd)->symtab_hdr.sh_name == (unsigned int) -1
|| elf_tdata (abfd)->shstrtab_hdr.sh_name == (unsigned int) -1)
return false;
return true;
}
static boolean
swap_out_syms (abfd)
bfd *abfd;
{
if (!elf_map_symbols (abfd))
return false;
/* Dump out the symtabs. */
{
int symcount = bfd_get_symcount (abfd);
asymbol **syms = bfd_get_outsymbols (abfd);
struct strtab *stt = bfd_new_strtab (abfd);
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Shdr *symstrtab_hdr;
Elf_External_Sym *outbound_syms;
int idx;
if (!stt)
return false;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
symtab_hdr->sh_type = SHT_SYMTAB;
symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
symtab_hdr->sh_size = symtab_hdr->sh_entsize * (symcount + 1);
symtab_hdr->sh_info = elf_num_locals (abfd) + 1;
/* FIXME: Systems I've checked use 4 byte alignment for .symtab,
but it is possible that there are systems which use a different
alignment. */
symtab_hdr->sh_addralign = 4;
/* see assert in elf_fake_sections that supports this: */
symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
symstrtab_hdr->sh_type = SHT_STRTAB;
outbound_syms = (Elf_External_Sym *)
bfd_alloc (abfd, (1 + symcount) * sizeof (Elf_External_Sym));
if (!outbound_syms)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
/* now generate the data (for "contents") */
{
/* Fill in zeroth symbol and swap it out. */
Elf_Internal_Sym sym;
sym.st_name = 0;
sym.st_value = 0;
sym.st_size = 0;
sym.st_info = 0;
sym.st_other = 0;
sym.st_shndx = SHN_UNDEF;
elf_swap_symbol_out (abfd, &sym, outbound_syms);
}
for (idx = 0; idx < symcount; idx++)
{
Elf_Internal_Sym sym;
bfd_vma value = syms[idx]->value;
if (syms[idx]->flags & BSF_SECTION_SYM)
/* Section symbols have no names. */
sym.st_name = 0;
else
{
sym.st_name = bfd_add_to_strtab (abfd, stt, syms[idx]->name);
if (sym.st_name == (unsigned long) -1)
return false;
}
if (bfd_is_com_section (syms[idx]->section))
{
/* ELF common symbols put the alignment into the `value' field,
and the size into the `size' field. This is backwards from
how BFD handles it, so reverse it here. */
sym.st_size = value;
/* Should retrieve this from somewhere... */
sym.st_value = 16;
sym.st_shndx = elf_section_from_bfd_section (abfd,
syms[idx]->section);
}
else
{
asection *sec = syms[idx]->section;
elf_symbol_type *type_ptr;
int shndx;
if (sec->output_section)
{
value += sec->output_offset;
sec = sec->output_section;
}
value += sec->vma;
sym.st_value = value;
type_ptr = elf_symbol_from (abfd, syms[idx]);
sym.st_size = type_ptr ? type_ptr->internal_elf_sym.st_size : 0;
sym.st_shndx = shndx = elf_section_from_bfd_section (abfd, sec);
if (shndx == -1)
{
asection *sec2;
/* Writing this would be a hell of a lot easier if we had
some decent documentation on bfd, and knew what to expect
of the library, and what to demand of applications. For
example, it appears that `objcopy' might not set the
section of a symbol to be a section that is actually in
the output file. */
sec2 = bfd_get_section_by_name (abfd, sec->name);
BFD_ASSERT (sec2 != 0);
sym.st_shndx = shndx = elf_section_from_bfd_section (abfd, sec2);
BFD_ASSERT (shndx != -1);
}
}
if (bfd_is_com_section (syms[idx]->section))
sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_OBJECT);
else if (syms[idx]->section == &bfd_und_section)
sym.st_info = ELF_ST_INFO (STB_GLOBAL, STT_NOTYPE);
else if (syms[idx]->flags & BSF_SECTION_SYM)
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
else if (syms[idx]->flags & BSF_FILE)
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
else
{
int bind = STB_LOCAL;
int type = STT_OBJECT;
unsigned int flags = syms[idx]->flags;
if (flags & BSF_LOCAL)
bind = STB_LOCAL;
else if (flags & BSF_WEAK)
bind = STB_WEAK;
else if (flags & BSF_GLOBAL)
bind = STB_GLOBAL;
if (flags & BSF_FUNCTION)
type = STT_FUNC;
sym.st_info = ELF_ST_INFO (bind, type);
}
sym.st_other = 0;
elf_swap_symbol_out (abfd, &sym,
(outbound_syms
+ elf_sym_extra (abfd)[idx].elf_sym_num));
}
symtab_hdr->contents = (PTR) outbound_syms;
symstrtab_hdr->contents = (PTR) stt->tab;
symstrtab_hdr->sh_size = stt->length;
symstrtab_hdr->sh_type = SHT_STRTAB;
symstrtab_hdr->sh_flags = 0;
symstrtab_hdr->sh_addr = 0;
symstrtab_hdr->sh_entsize = 0;
symstrtab_hdr->sh_link = 0;
symstrtab_hdr->sh_info = 0;
symstrtab_hdr->sh_addralign = 1;
symstrtab_hdr->size = 0;
}
return true;
}
static boolean
write_shdrs_and_ehdr (abfd)
bfd *abfd;
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_External_Shdr *x_shdrp; /* Section header table, external form */
Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
unsigned int count;
struct strtab *shstrtab;
i_ehdrp = elf_elfheader (abfd);
i_shdrp = elf_elfsections (abfd);
shstrtab = elf_shstrtab (abfd);
/* swap the header before spitting it out... */
#if DEBUG & 1
elf_debug_file (i_ehdrp);
#endif
elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
|| (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd)
!= sizeof (x_ehdr)))
return false;
/* at this point we've concocted all the ELF sections... */
x_shdrp = (Elf_External_Shdr *)
bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
if (!x_shdrp)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
for (count = 0; count < i_ehdrp->e_shnum; count++)
{
#if DEBUG & 2
elf_debug_section (shstrtab->tab + i_shdrp[count]->sh_name, count,
i_shdrp[count]);
#endif
elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
}
if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
|| (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd)
!= sizeof (*x_shdrp) * i_ehdrp->e_shnum))
return false;
/* need to dump the string table too... */
return true;
}
static void
assign_file_positions_for_relocs (abfd)
bfd *abfd;
{
file_ptr off = elf_tdata (abfd)->next_file_pos;
unsigned int i;
Elf_Internal_Shdr **shdrpp = elf_elfsections (abfd);
Elf_Internal_Shdr *shdrp;
for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
{
shdrp = shdrpp[i];
if (shdrp->sh_type != SHT_REL && shdrp->sh_type != SHT_RELA)
continue;
off = align_file_position (off);
off = assign_file_position_for_section (shdrp, off);
}
elf_tdata (abfd)->next_file_pos = off;
}
boolean
NAME(bfd_elf,write_object_contents) (abfd)
bfd *abfd;
{
struct elf_backend_data *bed = get_elf_backend_data (abfd);
Elf_Internal_Ehdr *i_ehdrp;
Elf_Internal_Shdr **i_shdrp;
unsigned int count;
/* We don't know how to write dynamic objects. Specifically, we
don't know how to construct the program header. */
if ((abfd->flags & DYNAMIC) != 0)
{
fprintf (stderr, "Writing ELF dynamic objects is not supported\n");
bfd_set_error (bfd_error_wrong_format);
return false;
}
if (! abfd->output_has_begun
&& ! elf_compute_section_file_positions (abfd,
(struct bfd_link_info *) NULL))
return false;
i_shdrp = elf_elfsections (abfd);
i_ehdrp = elf_elfheader (abfd);
bfd_map_over_sections (abfd, write_relocs, (PTR) 0);
assign_file_positions_for_relocs (abfd);
/* After writing the headers, we need to write the sections too... */
for (count = 1; count < i_ehdrp->e_shnum; count++)
{
if (bed->elf_backend_section_processing)
(*bed->elf_backend_section_processing) (abfd, i_shdrp[count]);
if (i_shdrp[count]->contents)
{
if (bfd_seek (abfd, i_shdrp[count]->sh_offset, SEEK_SET) != 0
|| (bfd_write (i_shdrp[count]->contents, i_shdrp[count]->sh_size,
1, abfd)
!= i_shdrp[count]->sh_size))
return false;
}
}
if (bed->elf_backend_final_write_processing)
(*bed->elf_backend_final_write_processing) (abfd);
return write_shdrs_and_ehdr (abfd);
}
/* Given an index of a section, retrieve a pointer to it. Note
that for our purposes, sections are indexed by {1, 2, ...} with
0 being an illegal index. */
/* In the original, each ELF section went into exactly one BFD
section. This doesn't really make sense, so we need a real mapping.
The mapping has to hide in the Elf_Internal_Shdr since asection
doesn't have anything like a tdata field... */
static asection *
section_from_elf_index (abfd, index)
bfd *abfd;
unsigned int index;
{
/* @@ Is bfd_com_section really correct in all the places it could
be returned from this routine? */
if (index == SHN_ABS)
return &bfd_com_section; /* not abs? */
if (index == SHN_COMMON)
return &bfd_com_section;
if (index > elf_elfheader (abfd)->e_shnum)
return NULL;
{
Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[index];
switch (hdr->sh_type)
{
/* ELF sections that map to BFD sections */
case SHT_PROGBITS:
case SHT_NOBITS:
if (hdr->rawdata == NULL)
{
if (! bfd_section_from_shdr (abfd, index))
return NULL;
}
return (struct sec *) hdr->rawdata;
default:
return (struct sec *) &bfd_abs_section;
}
}
}
/* given a section, search the header to find them... */
static int
elf_section_from_bfd_section (abfd, asect)
bfd *abfd;
struct sec *asect;
{
Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd);
int index;
Elf_Internal_Shdr *hdr;
int maxindex = elf_elfheader (abfd)->e_shnum;
if (asect == &bfd_abs_section)
return SHN_ABS;
if (asect == &bfd_com_section)
return SHN_COMMON;
if (asect == &bfd_und_section)
return SHN_UNDEF;
for (index = 0; index < maxindex; index++)
{
hdr = i_shdrp[index];
switch (hdr->sh_type)
{
/* ELF sections that map to BFD sections */
case SHT_PROGBITS:
case SHT_NOBITS:
case SHT_NOTE:
if (hdr->rawdata)
{
if (((struct sec *) (hdr->rawdata)) == asect)
return index;
}
break;
case SHT_STRTAB:
/* fix_up_strtabs will generate STRTAB sections with names
of .stab*str. */
if (!strncmp (asect->name, ".stab", 5)
&& !strcmp ("str", asect->name + strlen (asect->name) - 3))
{
if (hdr->rawdata)
{
if (((struct sec *) (hdr->rawdata)) == asect)
return index;
}
break;
}
/* FALL THROUGH */
default:
{
struct elf_backend_data *bed = get_elf_backend_data (abfd);
if (bed->elf_backend_section_from_bfd_section)
{
int retval;
retval = index;
if ((*bed->elf_backend_section_from_bfd_section)
(abfd, hdr, asect, &retval))
return retval;
}
}
break;
}
}
return -1;
}
/* given a symbol, return the bfd index for that symbol. */
static int
elf_symbol_from_bfd_symbol (abfd, asym_ptr_ptr)
bfd *abfd;
struct symbol_cache_entry **asym_ptr_ptr;
{
struct symbol_cache_entry *asym_ptr = *asym_ptr_ptr;
int idx;
flagword flags = asym_ptr->flags;
/* When gas creates relocations against local labels, it creates its
own symbol for the section, but does put the symbol into the
symbol chain, so udata is 0. When the linker is generating
relocatable output, this section symbol may be for one of the
input sections rather than the output section. */
if (asym_ptr->udata == (PTR) 0
&& (flags & BSF_SECTION_SYM)
&& asym_ptr->section)
{
int indx;
if (asym_ptr->section->output_section != NULL)
indx = asym_ptr->section->output_section->index;
else
indx = asym_ptr->section->index;
if (elf_section_syms (abfd)[indx])
asym_ptr->udata = elf_section_syms (abfd)[indx]->udata;
}
if (asym_ptr->udata)
idx = ((Elf_Sym_Extra *) asym_ptr->udata)->elf_sym_num;
else
{
abort ();
}
#if DEBUG & 4
{
fprintf (stderr,
"elf_symbol_from_bfd_symbol 0x%.8lx, name = %s, sym num = %d, flags = 0x%.8lx %s\n",
(long) asym_ptr, asym_ptr->name, idx, flags, elf_symbol_flags (flags));
fflush (stderr);
}
#endif
return idx;
}
static long
elf_slurp_symbol_table (abfd, symptrs, dynamic)
bfd *abfd;
asymbol **symptrs; /* Buffer for generated bfd symbols */
boolean dynamic;
{
Elf_Internal_Shdr *hdr;
long symcount; /* Number of external ELF symbols */
elf_symbol_type *sym; /* Pointer to current bfd symbol */
elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
Elf_Internal_Sym i_sym;
Elf_External_Sym *x_symp = NULL;
/* Read each raw ELF symbol, converting from external ELF form to
internal ELF form, and then using the information to create a
canonical bfd symbol table entry.
Note that we allocate the initial bfd canonical symbol buffer
based on a one-to-one mapping of the ELF symbols to canonical
symbols. We actually use all the ELF symbols, so there will be no
space left over at the end. When we have all the symbols, we
build the caller's pointer vector. */
if (dynamic)
hdr = &elf_tdata (abfd)->dynsymtab_hdr;
else
hdr = &elf_tdata (abfd)->symtab_hdr;
if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
return -1;
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
if (symcount == 0)
sym = symbase = NULL;
else
{
long i;
if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
return -1;
symbase = ((elf_symbol_type *)
bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type)));
if (symbase == (elf_symbol_type *) NULL)
{
bfd_set_error (bfd_error_no_memory);
return -1;
}
sym = symbase;
/* Temporarily allocate room for the raw ELF symbols. */
x_symp = ((Elf_External_Sym *)
malloc (symcount * sizeof (Elf_External_Sym)));
if (x_symp == NULL && symcount != 0)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
!= symcount * sizeof (Elf_External_Sym))
goto error_return;
/* Skip first symbol, which is a null dummy. */
for (i = 1; i < symcount; i++)
{
elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
#ifdef ELF_KEEP_EXTSYM
memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
#endif
sym->symbol.the_bfd = abfd;
sym->symbol.name = elf_string_from_elf_section (abfd, hdr->sh_link,
i_sym.st_name);
sym->symbol.value = i_sym.st_value;
if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERVE)
{
sym->symbol.section = section_from_elf_index (abfd,
i_sym.st_shndx);
if (sym->symbol.section == NULL)
goto error_return;
}
else if (i_sym.st_shndx == SHN_ABS)
{
sym->symbol.section = &bfd_abs_section;
}
else if (i_sym.st_shndx == SHN_COMMON)
{
sym->symbol.section = &bfd_com_section;
/* Elf puts the alignment into the `value' field, and
the size into the `size' field. BFD wants to see the
size in the value field, and doesn't care (at the
moment) about the alignment. */
sym->symbol.value = i_sym.st_size;
}
else if (i_sym.st_shndx == SHN_UNDEF)
{
sym->symbol.section = &bfd_und_section;
}
else
sym->symbol.section = &bfd_abs_section;
sym->symbol.value -= sym->symbol.section->vma;
switch (ELF_ST_BIND (i_sym.st_info))
{
case STB_LOCAL:
sym->symbol.flags |= BSF_LOCAL;
break;
case STB_GLOBAL:
sym->symbol.flags |= BSF_GLOBAL;
break;
case STB_WEAK:
sym->symbol.flags |= BSF_WEAK;
break;
}
switch (ELF_ST_TYPE (i_sym.st_info))
{
case STT_SECTION:
sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
break;
case STT_FILE:
sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
break;
case STT_FUNC:
sym->symbol.flags |= BSF_FUNCTION;
break;
}
if (dynamic)
sym->symbol.flags |= BSF_DYNAMIC;
/* Do some backend-specific processing on this symbol. */
{
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
if (ebd->elf_backend_symbol_processing)
(*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
}
sym++;
}
}
/* Do some backend-specific processing on this symbol table. */
{
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
if (ebd->elf_backend_symbol_table_processing)
(*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
}
/* We rely on the zalloc to clear out the final symbol entry. */
symcount = sym - symbase;
/* Fill in the user's symbol pointer vector if needed. */
if (symptrs)
{
long l = symcount;
sym = symbase;
while (l-- > 0)
{
*symptrs++ = &sym->symbol;
sym++;
}
*symptrs = 0; /* Final null pointer */
}
if (x_symp != NULL)
free (x_symp);
return symcount;
error_return:
if (x_symp != NULL)
free (x_symp);
return -1;
}
/* Return the number of bytes required to hold the symtab vector.
Note that we base it on the count plus 1, since we will null terminate
the vector allocated based on this size. However, the ELF symbol table
always has a dummy entry as symbol #0, so it ends up even. */
long
elf_get_symtab_upper_bound (abfd)
bfd *abfd;
{
long symcount;
long symtab_size;
Elf_Internal_Shdr *hdr = &elf_tdata (abfd)->symtab_hdr;
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
symtab_size = (symcount - 1 + 1) * (sizeof (asymbol *));
return symtab_size;
}
long
elf_get_dynamic_symtab_upper_bound (abfd)
bfd *abfd;
{
long symcount;
long symtab_size;
Elf_Internal_Shdr *hdr = &elf_tdata (abfd)->dynsymtab_hdr;
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
symtab_size = (symcount - 1 + 1) * (sizeof (asymbol *));
return symtab_size;
}
/*
This function return the number of bytes required to store the
relocation information associated with section <<sect>>
attached to bfd <<abfd>>
*/
long
elf_get_reloc_upper_bound (abfd, asect)
bfd *abfd;
sec_ptr asect;
{
if (asect->flags & SEC_RELOC)
{
/* either rel or rela */
return elf_section_data (asect)->rel_hdr.sh_size;
}
else
return 0;
}
static boolean
elf_slurp_reloca_table (abfd, asect, symbols)
bfd *abfd;
sec_ptr asect;
asymbol **symbols;
{
Elf_External_Rela *native_relocs;
arelent *reloc_cache;
arelent *cache_ptr;
unsigned int idx;
if (asect->relocation)
return true;
if (asect->reloc_count == 0)
return true;
if (asect->flags & SEC_CONSTRUCTOR)
return true;
if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
return false;
native_relocs = (Elf_External_Rela *)
bfd_alloc (abfd, asect->reloc_count * sizeof (Elf_External_Rela));
if (!native_relocs)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
if (bfd_read ((PTR) native_relocs,
sizeof (Elf_External_Rela), asect->reloc_count, abfd)
!= sizeof (Elf_External_Rela) * asect->reloc_count)
return false;
reloc_cache = (arelent *)
bfd_alloc (abfd, (size_t) (asect->reloc_count * sizeof (arelent)));
if (!reloc_cache)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
for (idx = 0; idx < asect->reloc_count; idx++)
{
Elf_Internal_Rela dst;
Elf_External_Rela *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
elf_swap_reloca_in (abfd, src, &dst);
#ifdef RELOC_PROCESSING
RELOC_PROCESSING (cache_ptr, &dst, symbols, abfd, asect);
#else
if (asect->flags & SEC_RELOC)
{
/* relocatable, so the offset is off of the section */
cache_ptr->address = dst.r_offset + asect->vma;
}
else
{
/* non-relocatable, so the offset a virtual address */
cache_ptr->address = dst.r_offset;
}
/* ELF_R_SYM(dst.r_info) is the symbol table offset. An offset
of zero points to the dummy symbol, which was not read into
the symbol table SYMBOLS. */
if (ELF_R_SYM (dst.r_info) == 0)
cache_ptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;
else
{
asymbol *s;
cache_ptr->sym_ptr_ptr = symbols + ELF_R_SYM (dst.r_info) - 1;
/* Translate any ELF section symbol into a BFD section
symbol. */
s = *(cache_ptr->sym_ptr_ptr);
if (s->flags & BSF_SECTION_SYM)
{
cache_ptr->sym_ptr_ptr = s->section->symbol_ptr_ptr;
s = *cache_ptr->sym_ptr_ptr;
if (s->name == 0 || s->name[0] == 0)
abort ();
}
}
cache_ptr->addend = dst.r_addend;
/* Fill in the cache_ptr->howto field from dst.r_type */
{
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
(*ebd->elf_info_to_howto) (abfd, cache_ptr, &dst);
}
#endif
}
asect->relocation = reloc_cache;
return true;
}
#ifdef DEBUG
static void
elf_debug_section (str, num, hdr)
char *str;
int num;
Elf_Internal_Shdr *hdr;
{
fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, str, (long) hdr);
fprintf (stderr,
"sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
(long) hdr->sh_name,
(long) hdr->sh_type,
(long) hdr->sh_flags);
fprintf (stderr,
"sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
(long) hdr->sh_addr,
(long) hdr->sh_offset,
(long) hdr->sh_size);
fprintf (stderr,
"sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
(long) hdr->sh_link,
(long) hdr->sh_info,
(long) hdr->sh_addralign);
fprintf (stderr, "sh_entsize = %ld\n",
(long) hdr->sh_entsize);
fprintf (stderr, "rawdata = 0x%.8lx\n", (long) hdr->rawdata);
fprintf (stderr, "contents = 0x%.8lx\n", (long) hdr->contents);
fprintf (stderr, "size = %ld\n", (long) hdr->size);
fflush (stderr);
}
static void
elf_debug_file (ehdrp)
Elf_Internal_Ehdr *ehdrp;
{
fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
}
#endif
static boolean
elf_slurp_reloc_table (abfd, asect, symbols)
bfd *abfd;
sec_ptr asect;
asymbol **symbols;
{
Elf_External_Rel *native_relocs;
arelent *reloc_cache;
arelent *cache_ptr;
Elf_Internal_Shdr *data_hdr;
bfd_vma data_off;
unsigned long data_max;
char buf[4]; /* FIXME -- might be elf64 */
unsigned int idx;
if (asect->relocation)
return true;
if (asect->reloc_count == 0)
return true;
if (asect->flags & SEC_CONSTRUCTOR)
return true;
if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
return false;
native_relocs = (Elf_External_Rel *)
bfd_alloc (abfd, asect->reloc_count * sizeof (Elf_External_Rel));
if (!native_relocs)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
if (bfd_read ((PTR) native_relocs,
sizeof (Elf_External_Rel), asect->reloc_count, abfd)
!= sizeof (Elf_External_Rel) * asect->reloc_count)
return false;
reloc_cache = (arelent *)
bfd_alloc (abfd, (size_t) (asect->reloc_count * sizeof (arelent)));
if (!reloc_cache)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
/* Get the offset of the start of the segment we are relocating to read in
the implicit addend. */
data_hdr = &elf_section_data (asect)->this_hdr;
data_off = data_hdr->sh_offset;
data_max = data_hdr->sh_size - sizeof (buf) + 1;
#if DEBUG & 2
elf_debug_section ("data section", -1, data_hdr);
#endif
for (idx = 0; idx < asect->reloc_count; idx++)
{
#ifdef RELOC_PROCESSING
Elf_Internal_Rel dst;
Elf_External_Rel *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
elf_swap_reloc_in (abfd, src, &dst);
RELOC_PROCESSING (cache_ptr, &dst, symbols, abfd, asect);
#else
Elf_Internal_Rel dst;
Elf_External_Rel *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
elf_swap_reloc_in (abfd, src, &dst);
if (asect->flags & SEC_RELOC)
{
/* relocatable, so the offset is off of the section */
cache_ptr->address = dst.r_offset + asect->vma;
}
else
{
/* non-relocatable, so the offset a virtual address */
cache_ptr->address = dst.r_offset;
}
/* ELF_R_SYM(dst.r_info) is the symbol table offset. An offset
of zero points to the dummy symbol, which was not read into
the symbol table SYMBOLS. */
if (ELF_R_SYM (dst.r_info) == 0)
cache_ptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;
else
{
asymbol *s;
cache_ptr->sym_ptr_ptr = symbols + ELF_R_SYM (dst.r_info) - 1;
/* Translate any ELF section symbol into a BFD section
symbol. */
s = *(cache_ptr->sym_ptr_ptr);
if (s->flags & BSF_SECTION_SYM)
{
cache_ptr->sym_ptr_ptr = s->section->symbol_ptr_ptr;
s = *cache_ptr->sym_ptr_ptr;
if (s->name == 0 || s->name[0] == 0)
abort ();
}
}
BFD_ASSERT (dst.r_offset <= data_max);
cache_ptr->addend = 0;
/* Fill in the cache_ptr->howto field from dst.r_type */
{
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
(*ebd->elf_info_to_howto_rel) (abfd, cache_ptr, &dst);
}
#endif
}
asect->relocation = reloc_cache;
return true;
}
long
elf_canonicalize_reloc (abfd, section, relptr, symbols)
bfd *abfd;
sec_ptr section;
arelent **relptr;
asymbol **symbols;
{
arelent *tblptr = section->relocation;
unsigned int count = 0;
int use_rela_p = get_elf_backend_data (abfd)->use_rela_p;
/* snarfed from coffcode.h */
if (use_rela_p)
{
if (! elf_slurp_reloca_table (abfd, section, symbols))
return -1;
}
else
{
if (! elf_slurp_reloc_table (abfd, section, symbols))
return -1;
}
tblptr = section->relocation;
for (; count++ < section->reloc_count;)
*relptr++ = tblptr++;
*relptr = 0;
return section->reloc_count;
}
long
elf_get_symtab (abfd, alocation)
bfd *abfd;
asymbol **alocation;
{
long symcount = elf_slurp_symbol_table (abfd, alocation, false);
if (symcount >= 0)
bfd_get_symcount (abfd) = symcount;
return symcount;
}
long
elf_canonicalize_dynamic_symtab (abfd, alocation)
bfd *abfd;
asymbol **alocation;
{
return elf_slurp_symbol_table (abfd, alocation, true);
}
asymbol *
elf_make_empty_symbol (abfd)
bfd *abfd;
{
elf_symbol_type *newsym;
newsym = (elf_symbol_type *) bfd_zalloc (abfd, sizeof (elf_symbol_type));
if (!newsym)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
else
{
newsym->symbol.the_bfd = abfd;
return &newsym->symbol;
}
}
void
elf_get_symbol_info (ignore_abfd, symbol, ret)
bfd *ignore_abfd;
asymbol *symbol;
symbol_info *ret;
{
bfd_symbol_info (symbol, ret);
}
void
elf_print_symbol (ignore_abfd, filep, symbol, how)
bfd *ignore_abfd;
PTR filep;
asymbol *symbol;
bfd_print_symbol_type how;
{
FILE *file = (FILE *) filep;
switch (how)
{
case bfd_print_symbol_name:
fprintf (file, "%s", symbol->name);
break;
case bfd_print_symbol_more:
fprintf (file, "elf ");
fprintf_vma (file, symbol->value);
fprintf (file, " %lx", (long) symbol->flags);
break;
case bfd_print_symbol_all:
{
CONST char *section_name;
section_name = symbol->section ? symbol->section->name : "(*none*)";
bfd_print_symbol_vandf ((PTR) file, symbol);
fprintf (file, " %s\t%s",
section_name,
symbol->name);
}
break;
}
}
alent *
elf_get_lineno (ignore_abfd, symbol)
bfd *ignore_abfd;
asymbol *symbol;
{
fprintf (stderr, "elf_get_lineno unimplemented\n");
fflush (stderr);
BFD_FAIL ();
return NULL;
}
boolean
elf_set_arch_mach (abfd, arch, machine)
bfd *abfd;
enum bfd_architecture arch;
unsigned long machine;
{
/* If this isn't the right architecture for this backend, and this
isn't the generic backend, fail. */
if (arch != get_elf_backend_data (abfd)->arch
&& arch != bfd_arch_unknown
&& get_elf_backend_data (abfd)->arch != bfd_arch_unknown)
return false;
return bfd_default_set_arch_mach (abfd, arch, machine);
}
boolean
elf_find_nearest_line (abfd,
section,
symbols,
offset,
filename_ptr,
functionname_ptr,
line_ptr)
bfd *abfd;
asection *section;
asymbol **symbols;
bfd_vma offset;
CONST char **filename_ptr;
CONST char **functionname_ptr;
unsigned int *line_ptr;
{
return false;
}
int
elf_sizeof_headers (abfd, reloc)
bfd *abfd;
boolean reloc;
{
fprintf (stderr, "elf_sizeof_headers unimplemented\n");
fflush (stderr);
BFD_FAIL ();
return 0;
}
boolean
elf_set_section_contents (abfd, section, location, offset, count)
bfd *abfd;
sec_ptr section;
PTR location;
file_ptr offset;
bfd_size_type count;
{
Elf_Internal_Shdr *hdr;
if (! abfd->output_has_begun
&& ! elf_compute_section_file_positions (abfd,
(struct bfd_link_info *) NULL))
return false;
hdr = &elf_section_data (section)->this_hdr;
if (bfd_seek (abfd, hdr->sh_offset + offset, SEEK_SET) == -1)
return false;
if (bfd_write (location, 1, count, abfd) != count)
return false;
return true;
}
void
elf_no_info_to_howto (abfd, cache_ptr, dst)
bfd *abfd;
arelent *cache_ptr;
Elf_Internal_Rela *dst;
{
fprintf (stderr, "elf RELA relocation support for target machine unimplemented\n");
fflush (stderr);
BFD_FAIL ();
}
void
elf_no_info_to_howto_rel (abfd, cache_ptr, dst)
bfd *abfd;
arelent *cache_ptr;
Elf_Internal_Rel *dst;
{
fprintf (stderr, "elf REL relocation support for target machine unimplemented\n");
fflush (stderr);
BFD_FAIL ();
}
/* Core file support */
#ifdef HAVE_PROCFS /* Some core file support requires host /proc files */
#include <sys/procfs.h>
#else
#define bfd_prstatus(abfd, descdata, descsz, filepos) true
#define bfd_fpregset(abfd, descdata, descsz, filepos) true
#define bfd_prpsinfo(abfd, descdata, descsz, filepos) true
#endif
#ifdef HAVE_PROCFS
static boolean
bfd_prstatus (abfd, descdata, descsz, filepos)
bfd *abfd;
char *descdata;
int descsz;
long filepos;
{
asection *newsect;
prstatus_t *status = (prstatus_t *) 0;
if (descsz == sizeof (prstatus_t))
{
newsect = bfd_make_section (abfd, ".reg");
if (newsect == NULL)
return false;
newsect->_raw_size = sizeof (status->pr_reg);
newsect->filepos = filepos + (long) &status->pr_reg;
newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
newsect->alignment_power = 2;
if ((core_prstatus (abfd) = bfd_alloc (abfd, descsz)) != NULL)
{
memcpy (core_prstatus (abfd), descdata, descsz);
}
}
return true;
}
/* Stash a copy of the prpsinfo structure away for future use. */
static boolean
bfd_prpsinfo (abfd, descdata, descsz, filepos)
bfd *abfd;
char *descdata;
int descsz;
long filepos;
{
if (descsz == sizeof (prpsinfo_t))
{
if ((core_prpsinfo (abfd) = bfd_alloc (abfd, descsz)) == NULL)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
memcpy (core_prpsinfo (abfd), descdata, descsz);
}
return true;
}
static boolean
bfd_fpregset (abfd, descdata, descsz, filepos)
bfd *abfd;
char *descdata;
int descsz;
long filepos;
{
asection *newsect;
newsect = bfd_make_section (abfd, ".reg2");
if (newsect == NULL)
return false;
newsect->_raw_size = descsz;
newsect->filepos = filepos;
newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
newsect->alignment_power = 2;
return true;
}
#endif /* HAVE_PROCFS */
/* Return a pointer to the args (including the command name) that were
seen by the program that generated the core dump. Note that for
some reason, a spurious space is tacked onto the end of the args
in some (at least one anyway) implementations, so strip it off if
it exists. */
char *
elf_core_file_failing_command (abfd)
bfd *abfd;
{
#ifdef HAVE_PROCFS
if (core_prpsinfo (abfd))
{
prpsinfo_t *p = core_prpsinfo (abfd);
char *scan = p->pr_psargs;
while (*scan++)
{;
}
scan -= 2;
if ((scan > p->pr_psargs) && (*scan == ' '))
{
*scan = '\000';
}
return p->pr_psargs;
}
#endif
return NULL;
}
/* Return the number of the signal that caused the core dump. Presumably,
since we have a core file, we got a signal of some kind, so don't bother
checking the other process status fields, just return the signal number.
*/
int
elf_core_file_failing_signal (abfd)
bfd *abfd;
{
#ifdef HAVE_PROCFS
if (core_prstatus (abfd))
{
return ((prstatus_t *) (core_prstatus (abfd)))->pr_cursig;
}
#endif
return -1;
}
/* Check to see if the core file could reasonably be expected to have
come for the current executable file. Note that by default we return
true unless we find something that indicates that there might be a
problem.
*/
boolean
elf_core_file_matches_executable_p (core_bfd, exec_bfd)
bfd *core_bfd;
bfd *exec_bfd;
{
#ifdef HAVE_PROCFS
char *corename;
char *execname;
#endif
/* First, xvecs must match since both are ELF files for the same target. */
if (core_bfd->xvec != exec_bfd->xvec)
{
bfd_set_error (bfd_error_system_call);
return false;
}
#ifdef HAVE_PROCFS
/* If no prpsinfo, just return true. Otherwise, grab the last component
of the exec'd pathname from the prpsinfo. */
if (core_prpsinfo (core_bfd))
{
corename = (((struct prpsinfo *) core_prpsinfo (core_bfd))->pr_fname);
}
else
{
return true;
}
/* Find the last component of the executable pathname. */
if ((execname = strrchr (exec_bfd->filename, '/')) != NULL)
{
execname++;
}
else
{
execname = (char *) exec_bfd->filename;
}
/* See if they match */
return strcmp (execname, corename) ? false : true;
#else
return true;
#endif /* HAVE_PROCFS */
}
/* ELF core files contain a segment of type PT_NOTE, that holds much of
the information that would normally be available from the /proc interface
for the process, at the time the process dumped core. Currently this
includes copies of the prstatus, prpsinfo, and fpregset structures.
Since these structures are potentially machine dependent in size and
ordering, bfd provides two levels of support for them. The first level,
available on all machines since it does not require that the host
have /proc support or the relevant include files, is to create a bfd
section for each of the prstatus, prpsinfo, and fpregset structures,
without any interpretation of their contents. With just this support,
the bfd client will have to interpret the structures itself. Even with
/proc support, it might want these full structures for it's own reasons.
In the second level of support, where HAVE_PROCFS is defined, bfd will
pick apart the structures to gather some additional information that
clients may want, such as the general register set, the name of the
exec'ed file and its arguments, the signal (if any) that caused the
core dump, etc.
*/
static boolean
elf_corefile_note (abfd, hdr)
bfd *abfd;
Elf_Internal_Phdr *hdr;
{
Elf_External_Note *x_note_p; /* Elf note, external form */
Elf_Internal_Note i_note; /* Elf note, internal form */
char *buf = NULL; /* Entire note segment contents */
char *namedata; /* Name portion of the note */
char *descdata; /* Descriptor portion of the note */
char *sectname; /* Name to use for new section */
long filepos; /* File offset to descriptor data */
asection *newsect;
if (hdr->p_filesz > 0
&& (buf = (char *) malloc (hdr->p_filesz)) != NULL
&& bfd_seek (abfd, hdr->p_offset, SEEK_SET) != -1
&& bfd_read ((PTR) buf, hdr->p_filesz, 1, abfd) == hdr->p_filesz)
{
x_note_p = (Elf_External_Note *) buf;
while ((char *) x_note_p < (buf + hdr->p_filesz))
{
i_note.namesz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->namesz);
i_note.descsz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->descsz);
i_note.type = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->type);
namedata = x_note_p->name;
descdata = namedata + BFD_ALIGN (i_note.namesz, 4);
filepos = hdr->p_offset + (descdata - buf);
switch (i_note.type)
{
case NT_PRSTATUS:
/* process descdata as prstatus info */
if (! bfd_prstatus (abfd, descdata, i_note.descsz, filepos))
return false;
sectname = ".prstatus";
break;
case NT_FPREGSET:
/* process descdata as fpregset info */
if (! bfd_fpregset (abfd, descdata, i_note.descsz, filepos))
return false;
sectname = ".fpregset";
break;
case NT_PRPSINFO:
/* process descdata as prpsinfo */
if (! bfd_prpsinfo (abfd, descdata, i_note.descsz, filepos))
return false;
sectname = ".prpsinfo";
break;
default:
/* Unknown descriptor, just ignore it. */
sectname = NULL;
break;
}
if (sectname != NULL)
{
newsect = bfd_make_section (abfd, sectname);
if (newsect == NULL)
return false;
newsect->_raw_size = i_note.descsz;
newsect->filepos = filepos;
newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS;
newsect->alignment_power = 2;
}
x_note_p = (Elf_External_Note *)
(descdata + BFD_ALIGN (i_note.descsz, 4));
}
}
if (buf != NULL)
{
free (buf);
}
else if (hdr->p_filesz > 0)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
return true;
}
/* Core files are simply standard ELF formatted files that partition
the file using the execution view of the file (program header table)
rather than the linking view. In fact, there is no section header
table in a core file.
The process status information (including the contents of the general
register set) and the floating point register set are stored in a
segment of type PT_NOTE. We handcraft a couple of extra bfd sections
that allow standard bfd access to the general registers (.reg) and the
floating point registers (.reg2).
*/
bfd_target *
elf_core_file_p (abfd)
bfd *abfd;
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
Elf_External_Phdr x_phdr; /* Program header table entry, external form */
Elf_Internal_Phdr *i_phdrp; /* Program header table, internal form */
unsigned int phindex;
struct elf_backend_data *ebd;
/* Read in the ELF header in external format. */
if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
{
if (bfd_get_error () != bfd_error_system_call)
bfd_set_error (bfd_error_wrong_format);
return NULL;
}
/* Now check to see if we have a valid ELF file, and one that BFD can
make use of. The magic number must match, the address size ('class')
and byte-swapping must match our XVEC entry, and it must have a
program header table (FIXME: See comments re segments at top of this
file). */
if (elf_file_p (&x_ehdr) == false)
{
wrong:
bfd_set_error (bfd_error_wrong_format);
return NULL;
}
/* FIXME, Check EI_VERSION here ! */
{
#if ARCH_SIZE == 32
int desired_address_size = ELFCLASS32;
#endif
#if ARCH_SIZE == 64
int desired_address_size = ELFCLASS64;
#endif
if (x_ehdr.e_ident[EI_CLASS] != desired_address_size)
goto wrong;
}
/* Switch xvec to match the specified byte order. */
switch (x_ehdr.e_ident[EI_DATA])
{
case ELFDATA2MSB: /* Big-endian */
if (abfd->xvec->byteorder_big_p == false)
goto wrong;
break;
case ELFDATA2LSB: /* Little-endian */
if (abfd->xvec->byteorder_big_p == true)
goto wrong;
break;
case ELFDATANONE: /* No data encoding specified */
default: /* Unknown data encoding specified */
goto wrong;
}
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
the tdata pointer in the bfd. */
elf_tdata (abfd) =
(struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata));
if (elf_tdata (abfd) == NULL)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
/* FIXME, `wrong' returns from this point onward, leak memory. */
/* Now that we know the byte order, swap in the rest of the header */
i_ehdrp = elf_elfheader (abfd);
elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
#if DEBUG & 1
elf_debug_file (i_ehdrp);
#endif
ebd = get_elf_backend_data (abfd);
/* Check that the ELF e_machine field matches what this particular
BFD format expects. */
if (ebd->elf_machine_code != i_ehdrp->e_machine)
{
bfd_target **target_ptr;
if (ebd->elf_machine_code != EM_NONE)
goto wrong;
/* This is the generic ELF target. Let it match any ELF target
for which we do not have a specific backend. */
for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
{
struct elf_backend_data *back;
if ((*target_ptr)->flavour != bfd_target_elf_flavour)
continue;
back = (struct elf_backend_data *) (*target_ptr)->backend_data;
if (back->elf_machine_code == i_ehdrp->e_machine)
{
/* target_ptr is an ELF backend which matches this
object file, so reject the generic ELF target. */
goto wrong;
}
}
}
/* If there is no program header, or the type is not a core file, then
we are hosed. */
if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE)
goto wrong;
/* Allocate space for a copy of the program header table in
internal form, seek to the program header table in the file,
read it in, and convert it to internal form. As a simple sanity
check, verify that the what BFD thinks is the size of each program
header table entry actually matches the size recorded in the file. */
if (i_ehdrp->e_phentsize != sizeof (x_phdr))
goto wrong;
i_phdrp = (Elf_Internal_Phdr *)
bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum);
if (!i_phdrp)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) == -1)
return NULL;
for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++)
{
if (bfd_read ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd)
!= sizeof (x_phdr))
return NULL;
elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);
}
/* Once all of the program headers have been read and converted, we
can start processing them. */
for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++)
{
bfd_section_from_phdr (abfd, i_phdrp + phindex, phindex);
if ((i_phdrp + phindex)->p_type == PT_NOTE)
{
if (! elf_corefile_note (abfd, i_phdrp + phindex))
return NULL;
}
}
/* Remember the entry point specified in the ELF file header. */
bfd_get_start_address (abfd) = i_ehdrp->e_entry;
return abfd->xvec;
}
/* ELF linker code. */
static boolean elf_link_add_object_symbols
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf_link_add_archive_symbols
PARAMS ((bfd *, struct bfd_link_info *));
/* Given an ELF BFD, add symbols to the global hash table as
appropriate. */
boolean
elf_bfd_link_add_symbols (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
switch (bfd_get_format (abfd))
{
case bfd_object:
return elf_link_add_object_symbols (abfd, info);
case bfd_archive:
return elf_link_add_archive_symbols (abfd, info);
default:
bfd_set_error (bfd_error_wrong_format);
return false;
}
}
/* Add symbols from an ELF archive file to the linker hash table. We
don't use _bfd_generic_link_add_archive_symbols because of a
problem which arises on UnixWare. The UnixWare libc.so is an
archive which includes an entry libc.so.1 which defines a bunch of
symbols. The libc.so archive also includes a number of other
object files, which also define symbols, some of which are the same
as those defined in libc.so.1. Correct linking requires that we
consider each object file in turn, and include it if it defines any
symbols we need. _bfd_generic_link_add_archive_symbols does not do
this; it looks through the list of undefined symbols, and includes
any object file which defines them. When this algorithm is used on
UnixWare, it winds up pulling in libc.so.1 early and defining a
bunch of symbols. This means that some of the other objects in the
archive are not included in the link, which is incorrect since they
precede libc.so.1 in the archive.
Fortunately, ELF archive handling is simpler than that done by
_bfd_generic_link_add_archive_symbols, which has to allow for a.out
oddities. In ELF, if we find a symbol in the archive map, and the
symbol is currently undefined, we know that we must pull in that
object file.
Unfortunately, we do have to make multiple passes over the symbol
table until nothing further is resolved. */
static boolean
elf_link_add_archive_symbols (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
symindex c;
boolean *defined = NULL;
boolean *included = NULL;
carsym *symdefs;
boolean loop;
if (! bfd_has_map (abfd))
{
bfd_set_error (bfd_error_no_symbols);
return false;
}
/* Keep track of all symbols we know to be already defined, and all
files we know to be already included. This is to speed up the
second and subsequent passes. */
c = bfd_ardata (abfd)->symdef_count;
if (c == 0)
return true;
defined = (boolean *) malloc (c * sizeof (boolean));
included = (boolean *) malloc (c * sizeof (boolean));
if (defined == (boolean *) NULL || included == (boolean *) NULL)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
memset (defined, 0, c * sizeof (boolean));
memset (included, 0, c * sizeof (boolean));
symdefs = bfd_ardata (abfd)->symdefs;
do
{
file_ptr last;
symindex i;
carsym *symdef;
carsym *symdefend;
loop = false;
last = -1;
symdef = symdefs;
symdefend = symdef + c;
for (i = 0; symdef < symdefend; symdef++, i++)
{
struct elf_link_hash_entry *h;
bfd *element;
struct bfd_link_hash_entry *undefs_tail;
symindex mark;
if (defined[i] || included[i])
continue;
if (symdef->file_offset == last)
{
included[i] = true;
continue;
}
h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
false, false, false);
if (h == (struct elf_link_hash_entry *) NULL)
continue;
if (h->root.type != bfd_link_hash_undefined)
{
defined[i] = true;
continue;
}
/* We need to include this archive member. */
element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
if (element == (bfd *) NULL)
goto error_return;
if (! bfd_check_format (element, bfd_object))
goto error_return;
/* Doublecheck that we have not included this object
already--it should be impossible, but there may be
something wrong with the archive. */
if (element->archive_pass != 0)
{
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
element->archive_pass = 1;
undefs_tail = info->hash->undefs_tail;
if (! (*info->callbacks->add_archive_element) (info, element,
symdef->name))
goto error_return;
if (! elf_link_add_object_symbols (element, info))
goto error_return;
/* If there are any new undefined symbols, we need to make
another pass through the archive in order to see whether
they can be defined. FIXME: This isn't perfect, because
common symbols wind up on undefs_tail and because an
undefined symbol which is defined later on in this pass
does not require another pass. This isn't a bug, but it
does make the code less efficient than it could be. */
if (undefs_tail != info->hash->undefs_tail)
loop = true;
/* Look backward to mark all symbols from this object file
which we have already seen in this pass. */
mark = i;
do
{
included[mark] = true;
if (mark == 0)
break;
--mark;
}
while (symdefs[mark].file_offset == symdef->file_offset);
/* We mark subsequent symbols from this object file as we go
on through the loop. */
last = symdef->file_offset;
}
}
while (loop);
free (defined);
free (included);
return true;
error_return:
if (defined != (boolean *) NULL)
free (defined);
if (included != (boolean *) NULL)
free (included);
return false;
}
/* Add symbols from an ELF object file to the linker hash table. */
static boolean
elf_link_add_object_symbols (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
const Elf_Internal_Sym *,
const char **, flagword *,
asection **, bfd_vma *));
boolean collect;
Elf_Internal_Shdr *hdr;
size_t symcount;
size_t extsymcount;
Elf_External_Sym *buf = NULL;
struct elf_link_hash_entry **sym_hash;
Elf_External_Sym *esym;
Elf_External_Sym *esymend;
add_symbol_hook = get_elf_backend_data (abfd)->elf_add_symbol_hook;
collect = get_elf_backend_data (abfd)->collect;
hdr = &elf_tdata (abfd)->symtab_hdr;
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
/* The sh_info field of the symtab header tells us where the
external symbols start. We don't care about the local symbols at
this point. */
extsymcount = symcount - hdr->sh_info;
buf = (Elf_External_Sym *) malloc (extsymcount * sizeof (Elf_External_Sym));
if (buf == NULL && extsymcount != 0)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
/* We keep hash table entry for each external symbol. */
sym_hash = ((struct elf_link_hash_entry **)
bfd_alloc (abfd,
extsymcount * sizeof (struct elf_link_hash_entry *)));
if (sym_hash == NULL)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
elf_sym_hashes (abfd) = sym_hash;
if (bfd_seek (abfd,
hdr->sh_offset + hdr->sh_info * sizeof (Elf_External_Sym),
SEEK_SET) != 0
|| (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
!= extsymcount * sizeof (Elf_External_Sym)))
goto error_return;
esymend = buf + extsymcount;
for (esym = buf; esym < esymend; esym++, sym_hash++)
{
Elf_Internal_Sym sym;
int bind;
bfd_vma value;
asection *sec;
flagword flags;
const char *name;
elf_swap_symbol_in (abfd, esym, &sym);
flags = BSF_NO_FLAGS;
sec = NULL;
value = sym.st_value;
*sym_hash = NULL;
bind = ELF_ST_BIND (sym.st_info);
if (bind == STB_LOCAL)
{
/* This should be impossible, since ELF requires that all
global symbols follow all local symbols, and that sh_info
point to the first global symbol. */
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
else if (bind == STB_GLOBAL)
flags = BSF_GLOBAL;
else if (bind == STB_WEAK)
flags = BSF_WEAK;
else
{
/* Leave it up to the processor backend. */
}
if (sym.st_shndx == SHN_UNDEF)
sec = &bfd_und_section;
else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
{
sec = section_from_elf_index (abfd, sym.st_shndx);
if (sec == NULL)
goto error_return;
value -= sec->vma;
}
else if (sym.st_shndx == SHN_ABS)
sec = &bfd_abs_section;
else if (sym.st_shndx == SHN_COMMON)
{
sec = &bfd_com_section;
/* What ELF calls the size we call the value. What ELF
calls the value we call the alignment. */
value = sym.st_size;
}
else
{
/* Leave it up to the processor backend. */
}
name = elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
if (name == (const char *) NULL)
goto error_return;
if (add_symbol_hook)
{
if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
&value))
goto error_return;
/* The hook function sets the name to NULL if this symbol
should be skipped for some reason. */
if (name == (const char *) NULL)
continue;
}
/* Sanity check that all possibilities were handled. */
if (flags == BSF_NO_FLAGS || sec == (asection *) NULL)
{
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
if (! (_bfd_generic_link_add_one_symbol
(info, abfd, name, flags, sec, value, (const char *) NULL,
false, collect, (struct bfd_link_hash_entry **) sym_hash)))
goto error_return;
if (info->hash->creator->flavour == bfd_target_elf_flavour)
{
/* Remember the symbol size, type and alignment. */
if (sym.st_size != 0)
{
/* FIXME: We should probably somehow give a warning if
the symbol size changes. */
(*sym_hash)->size = sym.st_size;
}
if (sym.st_shndx == SHN_COMMON
&& sym.st_value > (*sym_hash)->align)
(*sym_hash)->align = sym.st_value;
if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE)
{
/* FIXME: We should probably somehow give a warning if
the symbol type changes. */
(*sym_hash)->type = ELF_ST_TYPE (sym.st_info);
}
}
}
if (buf != NULL)
free (buf);
return true;
error_return:
if (buf != NULL)
free (buf);
return false;
}
/* Final phase of ELF linker. */
/* A structure we use to avoid passing large numbers of arguments. */
struct elf_final_link_info
{
/* General link information. */
struct bfd_link_info *info;
/* Output BFD. */
bfd *output_bfd;
/* Symbol string table. */
struct strtab *symstrtab;
/* Buffer large enough to hold contents of any section. */
bfd_byte *contents;
/* Buffer large enough to hold external relocs of any section. */
PTR external_relocs;
/* Buffer large enough to hold internal relocs of any section. */
Elf_Internal_Rela *internal_relocs;
/* Buffer large enough to hold external local symbols of any input
BFD. */
Elf_External_Sym *external_syms;
/* Buffer large enough to hold internal local symbols of any input
BFD. */
Elf_Internal_Sym *internal_syms;
/* Array large enough to hold a symbol index for each local symbol
of any input BFD. */
long *indices;
/* Array large enough to hold a section pointer for each local
symbol of any input BFD. */
asection **sections;
/* Buffer to hold swapped out symbols. */
Elf_External_Sym *symbuf;
/* Number of swapped out symbols in buffer. */
size_t symbuf_count;
/* Number of symbols which fit in symbuf. */
size_t symbuf_size;
};
static boolean elf_link_output_sym
PARAMS ((struct elf_final_link_info *, const char *, Elf_Internal_Sym *));
static boolean elf_link_flush_output_syms
PARAMS ((struct elf_final_link_info *));
static boolean elf_link_output_extsym
PARAMS ((struct elf_link_hash_entry *, PTR));
static boolean elf_link_input_bfd
PARAMS ((struct elf_final_link_info *, bfd *));
static boolean elf_reloc_link_order
PARAMS ((bfd *, struct bfd_link_info *, asection *,
struct bfd_link_order *));
/* Do the final step of an ELF link. */
boolean
elf_bfd_final_link (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
struct elf_final_link_info finfo;
register asection *o;
register struct bfd_link_order *p;
register bfd *sub;
size_t max_contents_size;
size_t max_external_reloc_size;
size_t max_internal_reloc_count;
size_t max_sym_count;
file_ptr off;
Elf_Internal_Sym elfsym;
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Shdr *symstrtab_hdr;
finfo.info = info;
finfo.output_bfd = abfd;
finfo.symstrtab = bfd_new_strtab (abfd);
if (finfo.symstrtab == NULL)
return false;
finfo.contents = NULL;
finfo.external_relocs = NULL;
finfo.internal_relocs = NULL;
finfo.external_syms = NULL;
finfo.internal_syms = NULL;
finfo.indices = NULL;
finfo.sections = NULL;
finfo.symbuf = NULL;
finfo.symbuf_count = 0;
/* Count up the number of relocations we will output for each output
section, so that we know the sizes of the reloc sections. We
also figure out some maximum sizes. */
max_contents_size = 0;
max_external_reloc_size = 0;
max_internal_reloc_count = 0;
max_sym_count = 0;
for (o = abfd->sections; o != (asection *) NULL; o = o->next)
{
o->reloc_count = 0;
for (p = o->link_order_head; p != NULL; p = p->next)
{
if (p->type == bfd_section_reloc_link_order
|| p->type == bfd_symbol_reloc_link_order)
++o->reloc_count;
else if (p->type == bfd_indirect_link_order)
{
asection *sec;
sec = p->u.indirect.section;
if (info->relocateable)
o->reloc_count += sec->reloc_count;
if (sec->_raw_size > max_contents_size)
max_contents_size = sec->_raw_size;
if (sec->_cooked_size > max_contents_size)
max_contents_size = sec->_cooked_size;
/* We are interested in just local symbols, not all
symbols. */
if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
&& (elf_tdata (sec->owner)->symtab_hdr.sh_info
> max_sym_count))
max_sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
if ((sec->flags & SEC_RELOC) != 0)
{
size_t ext_size;
ext_size = elf_section_data (sec)->rel_hdr.sh_size;
if (ext_size > max_external_reloc_size)
max_external_reloc_size = ext_size;
if (sec->reloc_count > max_internal_reloc_count)
max_internal_reloc_count = sec->reloc_count;
}
}
}
if (o->reloc_count > 0)
o->flags |= SEC_RELOC;
else
{
/* Explicitly clear the SEC_RELOC flag. The linker tends to
set it (this is probably a bug) and if it is set
assign_section_numbers will create a reloc section. */
o->flags &=~ SEC_RELOC;
}
}
/* Figure out the file positions for everything but the symbol table
and the relocs. We set symcount to force assign_section_numbers
to create a symbol table. */
abfd->symcount = info->strip == strip_all ? 0 : 1;
BFD_ASSERT (! abfd->output_has_begun);
if (! elf_compute_section_file_positions (abfd, info))
goto error_return;
/* That created the reloc sections. Set their sizes, and assign
them file positions, and allocate some buffers. */
for (o = abfd->sections; o != NULL; o = o->next)
{
if ((o->flags & SEC_RELOC) != 0)
{
Elf_Internal_Shdr *rel_hdr;
register struct elf_link_hash_entry **p, **pend;
rel_hdr = &elf_section_data (o)->rel_hdr;
rel_hdr->sh_size = rel_hdr->sh_entsize * o->reloc_count;
/* The contents field must last into write_object_contents,
so we allocate it with bfd_alloc rather than malloc. */
rel_hdr->contents = (PTR) bfd_alloc (abfd, rel_hdr->sh_size);
if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
p = ((struct elf_link_hash_entry **)
malloc (o->reloc_count
* sizeof (struct elf_link_hash_entry *)));
if (p == NULL && o->reloc_count != 0)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
elf_section_data (o)->rel_hashes = p;
pend = p + o->reloc_count;
for (; p < pend; p++)
*p = NULL;
/* Use the reloc_count field as an index when outputting the
relocs. */
o->reloc_count = 0;
}
}
assign_file_positions_for_relocs (abfd);
/* We have now assigned file positions for all the sections except
.symtab and .strtab. We start the .symtab section at the current
file position, and write directly to it. We build the .strtab
section in memory. When we add .dynsym support, we will build
that in memory as well (.dynsym is smaller than .symtab). */
abfd->symcount = 0;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
/* sh_name is set in prep_headers. */
symtab_hdr->sh_type = SHT_SYMTAB;
symtab_hdr->sh_flags = 0;
symtab_hdr->sh_addr = 0;
symtab_hdr->sh_size = 0;
symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
/* sh_link is set in assign_section_numbers. */
/* sh_info is set below. */
/* sh_offset is set just below. */
symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */
off = elf_tdata (abfd)->next_file_pos;
off = align_file_position (off);
off = assign_file_position_for_section (symtab_hdr, off);
/* Note that at this point elf_tdata (abfd)->next_file_pos is
incorrect. We do not yet know the size of the .symtab section.
We correct next_file_pos below, after we do know the size. */
/* Allocate a buffer to hold swapped out symbols. This is to avoid
continuously seeking to the right position in the file. */
if (! info->keep_memory || max_sym_count < 20)
finfo.symbuf_size = 20;
else
finfo.symbuf_size = max_sym_count;
finfo.symbuf = ((Elf_External_Sym *)
malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
if (finfo.symbuf == NULL)
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
/* Start writing out the symbol table. The first symbol is always a
dummy symbol. */
elfsym.st_value = 0;
elfsym.st_size = 0;
elfsym.st_info = 0;
elfsym.st_other = 0;
elfsym.st_shndx = SHN_UNDEF;
if (! elf_link_output_sym (&finfo, (const char *) NULL, &elfsym))
goto error_return;
#if 0
/* Some standard ELF linkers do this, but we don't because it causes
bootstrap comparison failures. */
/* Output a file symbol for the output file as the second symbol.
We output this even if we are discarding local symbols, although
I'm not sure if this is correct. */
elfsym.st_value = 0;
elfsym.st_size = 0;
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
elfsym.st_other = 0;
elfsym.st_shndx = SHN_ABS;
if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd), &elfsym))
goto error_return;
#endif
/* Output a symbol for each section. We output these even if we are
discarding local symbols, since they are used for relocs. These
symbols have no names. We store the index of each one in the
index field of the section, so that we can find it again when
outputting relocs. */
elfsym.st_value = 0;
elfsym.st_size = 0;
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
elfsym.st_other = 0;
for (o = abfd->sections; o != NULL; o = o->next)
{
o->index = abfd->symcount;
elfsym.st_shndx = elf_section_from_bfd_section (abfd, o);
if (elfsym.st_shndx == (unsigned long) -1)
goto error_return;
if (! elf_link_output_sym (&finfo, (const char *) NULL, &elfsym))
goto error_return;
}
/* Allocate some memory to hold information read in from the input
files. */
finfo.contents = (bfd_byte *) malloc (max_contents_size);
finfo.external_relocs = (PTR) malloc (max_external_reloc_size);
finfo.internal_relocs = ((Elf_Internal_Rela *)
malloc (max_internal_reloc_count
* sizeof (Elf_Internal_Rela)));
finfo.external_syms = ((Elf_External_Sym *)
malloc (max_sym_count * sizeof (Elf_External_Sym)));
finfo.internal_syms = ((Elf_Internal_Sym *)
malloc (max_sym_count * sizeof (Elf_Internal_Sym)));
finfo.indices = (long *) malloc (max_sym_count * sizeof (long));
finfo.sections = (asection **) malloc (max_sym_count * sizeof (asection *));
if ((finfo.contents == NULL && max_contents_size != 0)
|| (finfo.external_relocs == NULL && max_external_reloc_size != 0)
|| (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
|| (finfo.external_syms == NULL && max_sym_count != 0)
|| (finfo.internal_syms == NULL && max_sym_count != 0)
|| (finfo.indices == NULL && max_sym_count != 0)
|| (finfo.sections == NULL && max_sym_count != 0))
{
bfd_set_error (bfd_error_no_memory);
goto error_return;
}
/* Since ELF permits relocations to be against local symbols, we
must have the local symbols available when we do the relocations.
Since we would rather only read the local symbols once, and we
would rather not keep them in memory, we handle all the
relocations for a single input file at the same time.
Unfortunately, there is no way to know the total number of local
symbols until we have seen all of them, and the local symbol
indices precede the global symbol indices. This means that when
we are generating relocateable output, and we see a reloc against
a global symbol, we can not know the symbol index until we have
finished examining all the local symbols to see which ones we are
going to output. To deal with this, we keep the relocations in
memory, and don't output them until the end of the link. This is
an unfortunate waste of memory, but I don't see a good way around
it. Fortunately, it only happens when performing a relocateable
link, which is not the common case. FIXME: If keep_memory is set
we could write the relocs out and then read them again; I don't
know how bad the memory loss will be. */
for (sub = info->input_bfds; sub != NULL; sub = sub->next)
sub->output_has_begun = false;
for (o = abfd->sections; o != NULL; o = o->next)
{
for (p = o->link_order_head; p != NULL; p = p->next)
{
if (p->type == bfd_indirect_link_order
&& (bfd_get_flavour (p->u.indirect.section->owner)
== bfd_target_elf_flavour))
{
sub = p->u.indirect.section->owner;
if (! sub->output_has_begun)
{
if (! elf_link_input_bfd (&finfo, sub))
goto error_return;
sub->output_has_begun = true;
}
}
else if (p->type == bfd_section_reloc_link_order
|| p->type == bfd_symbol_reloc_link_order)
{
if (! elf_reloc_link_order (abfd, info, o, p))
goto error_return;
}
else
{
if (! _bfd_default_link_order (abfd, info, o, p))
goto error_return;
}
}
}
/* That wrote out all the local symbols. Finish up the symbol table
with the global symbols. */
/* The sh_info field records the index of the first non local
symbol. */
symtab_hdr->sh_info = abfd->symcount;
/* We get the global symbols from the hash table. */
if (info->strip != strip_all)
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
(PTR) &finfo);
/* Flush all symbols to the file. */
if (! elf_link_flush_output_syms (&finfo))
return false;
/* Now we know the size of the symtab section. */
off += symtab_hdr->sh_size;
/* Finish up the symbol string table (.strtab) section. */
symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
/* sh_name was set in prep_headers. */
symstrtab_hdr->sh_type = SHT_STRTAB;
symstrtab_hdr->sh_flags = 0;
symstrtab_hdr->sh_addr = 0;
symstrtab_hdr->sh_size = finfo.symstrtab->length;
symstrtab_hdr->sh_entsize = 0;
symstrtab_hdr->sh_link = 0;
symstrtab_hdr->sh_info = 0;
/* sh_offset is set just below. */
symstrtab_hdr->sh_addralign = 1;
symstrtab_hdr->contents = (PTR) finfo.symstrtab->tab;
off = assign_file_position_for_section (symstrtab_hdr, off);
elf_tdata (abfd)->next_file_pos = off;
/* Adjust the relocs to have the correct symbol indices. */
for (o = abfd->sections; o != NULL; o = o->next)
{
struct elf_link_hash_entry **rel_hash;
Elf_Internal_Shdr *rel_hdr;
size_t i;
if ((o->flags & SEC_RELOC) == 0)
continue;
rel_hash = elf_section_data (o)->rel_hashes;
rel_hdr = &elf_section_data (o)->rel_hdr;
for (i = 0; i < o->reloc_count; i++, rel_hash++)
{
if (*rel_hash == NULL)
continue;
BFD_ASSERT ((*rel_hash)->indx >= 0);
if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
{
Elf_External_Rel *erel;
Elf_Internal_Rel irel;
erel = (Elf_External_Rel *) rel_hdr->contents + i;
elf_swap_reloc_in (abfd, erel, &irel);
irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
ELF_R_TYPE (irel.r_info));
elf_swap_reloc_out (abfd, &irel, erel);
}
else
{
Elf_External_Rela *erela;
Elf_Internal_Rela irela;
BFD_ASSERT (rel_hdr->sh_entsize
== sizeof (Elf_External_Rela));
erela = (Elf_External_Rela *) rel_hdr->contents + i;
elf_swap_reloca_in (abfd, erela, &irela);
irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
ELF_R_TYPE (irela.r_info));
elf_swap_reloca_out (abfd, &irela, erela);
}
}
/* Set the reloc_count field to 0 to prevent write_relocs from
trying to swap the relocs out itself. */
o->reloc_count = 0;
}
if (finfo.contents != NULL)
free (finfo.contents);
if (finfo.external_relocs != NULL)
free (finfo.external_relocs);
if (finfo.internal_relocs != NULL)
free (finfo.internal_relocs);
if (finfo.external_syms != NULL)
free (finfo.external_syms);
if (finfo.internal_syms != NULL)
free (finfo.internal_syms);
if (finfo.indices != NULL)
free (finfo.indices);
if (finfo.sections != NULL)
free (finfo.sections);
if (finfo.symbuf != NULL)
free (finfo.symbuf);
for (o = abfd->sections; o != NULL; o = o->next)
{
if ((o->flags & SEC_RELOC) != 0
&& elf_section_data (o)->rel_hashes != NULL)
free (elf_section_data (o)->rel_hashes);
}
return true;
error_return:
if (finfo.contents != NULL)
free (finfo.contents);
if (finfo.external_relocs != NULL)
free (finfo.external_relocs);
if (finfo.internal_relocs != NULL)
free (finfo.internal_relocs);
if (finfo.external_syms != NULL)
free (finfo.external_syms);
if (finfo.internal_syms != NULL)
free (finfo.internal_syms);
if (finfo.indices != NULL)
free (finfo.indices);
if (finfo.sections != NULL)
free (finfo.sections);
if (finfo.symbuf != NULL)
free (finfo.symbuf);
for (o = abfd->sections; o != NULL; o = o->next)
{
if ((o->flags & SEC_RELOC) != 0
&& elf_section_data (o)->rel_hashes != NULL)
free (elf_section_data (o)->rel_hashes);
}
return false;
}
/* Add a symbol to the output symbol table. */
static boolean
elf_link_output_sym (finfo, name, elfsym)
struct elf_final_link_info *finfo;
const char *name;
Elf_Internal_Sym *elfsym;
{
if (name == (const char *) NULL || *name == '\0')
elfsym->st_name = 0;
else
{
elfsym->st_name = bfd_add_to_strtab (finfo->output_bfd,
finfo->symstrtab, name);
if (elfsym->st_name == (unsigned long) -1)
return false;
}
if (finfo->symbuf_count >= finfo->symbuf_size)
{
if (! elf_link_flush_output_syms (finfo))
return false;
}
elf_swap_symbol_out (finfo->output_bfd, elfsym,
finfo->symbuf + finfo->symbuf_count);
++finfo->symbuf_count;
++finfo->output_bfd->symcount;
return true;
}
/* Flush the output symbols to the file. */
static boolean
elf_link_flush_output_syms (finfo)
struct elf_final_link_info *finfo;
{
Elf_Internal_Shdr *symtab;
symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
SEEK_SET) != 0
|| (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
sizeof (Elf_External_Sym), finfo->output_bfd)
!= finfo->symbuf_count * sizeof (Elf_External_Sym)))
return false;
symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
finfo->symbuf_count = 0;
return true;
}
/* Add an external symbol to the symbol table. This is called from
the hash table traversal routine. */
static boolean
elf_link_output_extsym (h, data)
struct elf_link_hash_entry *h;
PTR data;
{
struct elf_final_link_info *finfo = (struct elf_final_link_info *) data;
Elf_Internal_Sym sym;
/* h->indx is set to -2 if this symbol is used by a reloc. */
if (h->indx == -1
&& finfo->info->strip == strip_some
&& bfd_hash_lookup (finfo->info->keep_hash, h->root.root.string,
false, false) == NULL)
return true;
sym.st_value = 0;
sym.st_size = h->size;
sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
sym.st_other = 0;
switch (h->root.type)
{
default:
case bfd_link_hash_new:
abort ();
return false;
case bfd_link_hash_undefined:
sym.st_shndx = SHN_UNDEF;
break;
case bfd_link_hash_weak:
sym.st_shndx = SHN_UNDEF;
sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
break;
case bfd_link_hash_defined:
{
asection *sec;
sec = h->root.u.def.section;
sym.st_shndx = elf_section_from_bfd_section (finfo->output_bfd,
sec->output_section);
if (sym.st_shndx == (unsigned long) -1)
{
/* FIXME: No way to handle errors. */
abort ();
}
/* ELF symbols in relocateable files are section relative, but
in nonrelocateable files they are virtual addresses. */
sym.st_value = h->root.u.def.value + sec->output_offset;
if (! finfo->info->relocateable)
sym.st_value += sec->output_section->vma;
}
break;
case bfd_link_hash_common:
sym.st_shndx = SHN_COMMON;
if (h->align == 0)
sym.st_value = 1;
else
sym.st_value = h->align;
break;
case bfd_link_hash_indirect:
case bfd_link_hash_warning:
/* I have no idea how these should be handled. */
return true;
}
h->indx = finfo->output_bfd->symcount;
if (! elf_link_output_sym (finfo, h->root.root.string, &sym))
{
/* FIXME: No way to return error. */
abort ();
}
return true;
}
/* Link an input file into the linker output file. This function
handles all the sections and relocations of the input file at once.
This is so that we only have to read the local symbols once, and
don't have to keep them in memory. */
static boolean
elf_link_input_bfd (finfo, input_bfd)
struct elf_final_link_info *finfo;
bfd *input_bfd;
{
boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *,
Elf_Internal_Sym *,
asection **));
bfd *output_bfd;
Elf_Internal_Shdr *symtab_hdr;
Elf_External_Sym *esym;
Elf_External_Sym *esymend;
Elf_Internal_Sym *isym;
long *pindex;
asection **ppsection;
asection *o;
output_bfd = finfo->output_bfd;
relocate_section =
get_elf_backend_data (output_bfd)->elf_backend_relocate_section;
/* Read the local symbols. */
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
|| (bfd_read (finfo->external_syms, sizeof (Elf_External_Sym),
symtab_hdr->sh_info, input_bfd)
!= symtab_hdr->sh_info * sizeof (Elf_External_Sym)))
return false;
/* Swap in the local symbols and write out the ones which we know
are going into the output file. */
esym = finfo->external_syms;
esymend = esym + symtab_hdr->sh_info;
isym = finfo->internal_syms;
pindex = finfo->indices;
ppsection = finfo->sections;
for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
{
asection *isec;
const char *name;
bfd_vma oldval;
elf_swap_symbol_in (input_bfd, esym, isym);
*pindex = -1;
if (isym->st_shndx == SHN_UNDEF)
isec = &bfd_und_section;
else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
{
isec = section_from_elf_index (input_bfd, isym->st_shndx);
if (isec == NULL)
return false;
}
else if (isym->st_shndx == SHN_ABS)
isec = &bfd_abs_section;
else if (isym->st_shndx == SHN_COMMON)
isec = &bfd_com_section;
else
{
/* Who knows? */
isec = NULL;
}
*ppsection = isec;
/* Don't output the first, undefined, symbol. */
if (esym == finfo->external_syms)
continue;
/* If we are stripping all symbols, we don't want to output this
one. */
if (finfo->info->strip == strip_all)
continue;
/* We never output section symbols. Instead, we use the section
symbol of the corresponding section in the output file. */
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
continue;
/* If we are discarding all local symbols, we don't want to
output this one. If we are generating a relocateable output
file, then some of the local symbols may be required by
relocs; we output them below as we discover that they are
needed. */
if (finfo->info->discard == discard_all)
continue;
/* Get the name of the symbol. */
name = elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
isym->st_name);
if (name == NULL)
return false;
/* See if we are discarding symbols with this name. */
if ((finfo->info->strip == strip_some
&& (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
== NULL))
|| (finfo->info->discard == discard_l
&& strncmp (name, finfo->info->lprefix,
finfo->info->lprefix_len) == 0))
continue;
/* If we get here, we are going to output this symbol. */
/* Adjust the section index for the output file. */
isym->st_shndx = elf_section_from_bfd_section (output_bfd,
isec->output_section);
if (isym->st_shndx == (unsigned long) -1)
return false;
*pindex = output_bfd->symcount;
/* ELF symbols in relocateable files are section relative, but
in executable files they are virtual addresses. Note that
this code assumes that all ELF sections have an associated
BFD section with a reasonable value for output_offset; below
we assume that they also have a reasonable value for
output_section. Any special sections must be set up to meet
these requirements. */
oldval = isym->st_value;
isym->st_value += isec->output_offset;
if (! finfo->info->relocateable)
isym->st_value += isec->output_section->vma;
if (! elf_link_output_sym (finfo, name, isym))
return false;
/* Restore the old value for reloc handling. */
isym->st_value = oldval;
}
/* Relocate the contents of each section. */
for (o = input_bfd->sections; o != NULL; o = o->next)
{
Elf_Internal_Shdr *input_rel_hdr;
if ((o->flags & SEC_HAS_CONTENTS) == 0)
continue;
/* Read the contents of the section. */
if (! bfd_get_section_contents (input_bfd, o, finfo->contents,
(file_ptr) 0, o->_raw_size))
return false;
if ((o->flags & SEC_RELOC) != 0)
{
/* Read in the relocs. */
input_rel_hdr = &elf_section_data (o)->rel_hdr;
if (bfd_seek (input_bfd, input_rel_hdr->sh_offset, SEEK_SET) != 0
|| bfd_read (finfo->external_relocs, 1, input_rel_hdr->sh_size,
input_bfd) != input_rel_hdr->sh_size)
return false;
/* Swap in the relocs. For convenience, we always produce
an Elf_Internal_Rela array; if the relocs are Rel, we set
the addend to 0. */
if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
{
Elf_External_Rel *erel;
Elf_External_Rel *erelend;
Elf_Internal_Rela *irela;
erel = (Elf_External_Rel *) finfo->external_relocs;
erelend = erel + o->reloc_count;
irela = finfo->internal_relocs;
for (; erel < erelend; erel++, irela++)
{
Elf_Internal_Rel irel;
elf_swap_reloc_in (input_bfd, erel, &irel);
irela->r_offset = irel.r_offset;
irela->r_info = irel.r_info;
irela->r_addend = 0;
}
}
else
{
Elf_External_Rela *erela;
Elf_External_Rela *erelaend;
Elf_Internal_Rela *irela;
BFD_ASSERT (input_rel_hdr->sh_entsize
== sizeof (Elf_External_Rela));
erela = (Elf_External_Rela *) finfo->external_relocs;
erelaend = erela + o->reloc_count;
irela = finfo->internal_relocs;
for (; erela < erelaend; erela++, irela++)
elf_swap_reloca_in (input_bfd, erela, irela);
}
/* Relocate the section by invoking a back end routine.
The back end routine is responsible for adjusting the
section contents as necessary, and (if using Rela relocs
and generating a relocateable output file) adjusting the
reloc addend as necessary.
The back end routine does not have to worry about setting
the reloc address or the reloc symbol index.
The back end routine is given a pointer to the swapped in
internal symbols, and can access the hash table entries
for the external symbols via elf_sym_hashes (input_bfd).
When generating relocateable output, the back end routine
must handle STB_LOCAL/STT_SECTION symbols specially. The
output symbol is going to be a section symbol
corresponding to the output section, which will require
the addend to be adjusted. */
if (! (*relocate_section) (output_bfd, finfo->info,
input_bfd, o,
finfo->contents,
finfo->internal_relocs,
finfo->internal_syms,
finfo->sections))
return false;
if (finfo->info->relocateable)
{
Elf_Internal_Rela *irela;
Elf_Internal_Rela *irelaend;
struct elf_link_hash_entry **rel_hash;
Elf_Internal_Shdr *output_rel_hdr;
/* Adjust the reloc addresses and symbol indices. */
irela = finfo->internal_relocs;
irelaend = irela + o->reloc_count;
rel_hash = (elf_section_data (o->output_section)->rel_hashes
+ o->output_section->reloc_count);
for (; irela < irelaend; irela++, rel_hash++)
{
long r_symndx;
Elf_Internal_Sym *isym;
asection *sec;
irela->r_offset += o->output_offset;
r_symndx = ELF_R_SYM (irela->r_info);
if (r_symndx == 0)
continue;
if (r_symndx >= symtab_hdr->sh_info)
{
long indx;
/* This is a reloc against a global symbol. We
have not yet output all the local symbols, so
we do not know the symbol index of any global
symbol. We set the rel_hash entry for this
reloc to point to the global hash table entry
for this symbol. The symbol index is then
set at the end of elf_bfd_final_link. */
indx = r_symndx - symtab_hdr->sh_info;
*rel_hash = elf_sym_hashes (input_bfd)[indx];
/* Setting the index to -2 tells
elf_link_output_extsym that this symbol is
used by a reloc. */
BFD_ASSERT ((*rel_hash)->indx < 0);
(*rel_hash)->indx = -2;
continue;
}
/* This is a reloc against a local symbol. */
*rel_hash = NULL;
isym = finfo->internal_syms + r_symndx;
sec = finfo->sections[r_symndx];
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
{
/* I suppose the backend ought to fill in the
section of any STT_SECTION symbol against a
processor specific section. */
if (sec == NULL
|| sec == &bfd_und_section
|| sec == &bfd_com_section)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
else if (sec == &bfd_abs_section)
r_symndx = 0;
else
r_symndx = sec->output_section->index;
}
else
{
if (finfo->indices[r_symndx] == -1)
{
unsigned long link;
const char *name;
asection *osec;
if (finfo->info->strip == strip_all)
{
/* You can't do ld -r -s. */
bfd_set_error (bfd_error_invalid_operation);
return false;
}
/* This symbol was skipped earlier, but
since it is needed by a reloc, we
must output it now. */
link = symtab_hdr->sh_link;
name = elf_string_from_elf_section (input_bfd,
link,
isym->st_name);
if (name == NULL)
return false;
osec = sec->output_section;
isym->st_shndx =
elf_section_from_bfd_section (output_bfd,
osec);
if (isym->st_shndx == (unsigned long) -1)
return false;
isym->st_value += sec->output_offset;
if (! finfo->info->relocateable)
isym->st_value += osec->vma;
finfo->indices[r_symndx] = output_bfd->symcount;
if (! elf_link_output_sym (finfo, name, isym))
return false;
}
r_symndx = finfo->indices[r_symndx];
}
irela->r_info = ELF_R_INFO (r_symndx,
ELF_R_TYPE (irela->r_info));
}
/* Swap out the relocs. */
output_rel_hdr = &elf_section_data (o->output_section)->rel_hdr;
BFD_ASSERT (output_rel_hdr->sh_entsize
== input_rel_hdr->sh_entsize);
irela = finfo->internal_relocs;
irelaend = irela + o->reloc_count;
if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
{
Elf_External_Rel *erel;
erel = ((Elf_External_Rel *) output_rel_hdr->contents
+ o->output_section->reloc_count);
for (; irela < irelaend; irela++, erel++)
{
Elf_Internal_Rel irel;
irel.r_offset = irela->r_offset;
irel.r_info = irela->r_info;
BFD_ASSERT (irela->r_addend == 0);
elf_swap_reloc_out (output_bfd, &irel, erel);
}
}
else
{
Elf_External_Rela *erela;
BFD_ASSERT (input_rel_hdr->sh_entsize
== sizeof (Elf_External_Rela));
erela = ((Elf_External_Rela *) output_rel_hdr->contents
+ o->output_section->reloc_count);
for (; irela < irelaend; irela++, erela++)
elf_swap_reloca_out (output_bfd, irela, erela);
}
o->output_section->reloc_count += o->reloc_count;
}
}
/* Write out the modified section contents. */
if (! bfd_set_section_contents (output_bfd, o->output_section,
finfo->contents, o->output_offset,
(o->_cooked_size != 0
? o->_cooked_size
: o->_raw_size)))
return false;
}
return true;
}
/* Generate a reloc when linking an ELF file. This is a reloc
requested by the linker, and does come from any input file. This
is used to build constructor and destructor tables when linking
with -Ur. */
static boolean
elf_reloc_link_order (output_bfd, info, output_section, link_order)
bfd *output_bfd;
struct bfd_link_info *info;
asection *output_section;
struct bfd_link_order *link_order;
{
const reloc_howto_type *howto;
long indx;
bfd_vma offset;
struct elf_link_hash_entry **rel_hash_ptr;
Elf_Internal_Shdr *rel_hdr;
howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
if (howto == NULL)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
/* If this is an inplace reloc, we must write the addend into the
object file. */
if (howto->partial_inplace
&& link_order->u.reloc.p->addend != 0)
{
bfd_size_type size;
bfd_reloc_status_type rstat;
bfd_byte *buf;
boolean ok;
size = bfd_get_reloc_size (howto);
buf = (bfd_byte *) bfd_zmalloc (size);
if (buf == (bfd_byte *) NULL)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
rstat = _bfd_relocate_contents (howto, output_bfd,
link_order->u.reloc.p->addend, buf);
switch (rstat)
{
case bfd_reloc_ok:
break;
default:
case bfd_reloc_outofrange:
abort ();
case bfd_reloc_overflow:
if (! ((*info->callbacks->reloc_overflow)
(info,
(link_order->type == bfd_section_reloc_link_order
? bfd_section_name (output_bfd,
link_order->u.reloc.p->u.section)
: link_order->u.reloc.p->u.name),
howto->name, link_order->u.reloc.p->addend,
(bfd *) NULL, (asection *) NULL, (bfd_vma) 0)))
{
free (buf);
return false;
}
break;
}
ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
(file_ptr) link_order->offset, size);
free (buf);
if (! ok)
return false;
}
/* Figure out the symbol index. */
rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
+ output_section->reloc_count);
if (link_order->type == bfd_section_reloc_link_order)
{
indx = link_order->u.reloc.p->u.section->index;
*rel_hash_ptr = NULL;
}
else
{
struct elf_link_hash_entry *h;
h = elf_link_hash_lookup (elf_hash_table (info),
link_order->u.reloc.p->u.name,
false, false, true);
if (h != NULL)
{
/* Setting the index to -2 tells elf_link_output_extsym that
this symbol is used by a reloc. */
h->indx = -2;
*rel_hash_ptr = h;
indx = 0;
}
else
{
if (! ((*info->callbacks->unattached_reloc)
(info, link_order->u.reloc.p->u.name, (bfd *) NULL,
(asection *) NULL, (bfd_vma) 0)))
return false;
indx = 0;
}
}
/* The address of a reloc is relative to the section in a
relocateable file, and is a virtual address in an executable
file. */
offset = link_order->offset;
if (! info->relocateable)
offset += output_section->vma;
rel_hdr = &elf_section_data (output_section)->rel_hdr;
if (rel_hdr->sh_type == SHT_REL)
{
Elf_Internal_Rel irel;
Elf_External_Rel *erel;
irel.r_offset = offset;
irel.r_info = ELF_R_INFO (indx, howto->type);
erel = ((Elf_External_Rel *) rel_hdr->contents
+ output_section->reloc_count);
elf_swap_reloc_out (output_bfd, &irel, erel);
}
else
{
Elf_Internal_Rela irela;
Elf_External_Rela *erela;
irela.r_offset = offset;
irela.r_info = ELF_R_INFO (indx, howto->type);
irela.r_addend = link_order->u.reloc.p->addend;
erela = ((Elf_External_Rela *) rel_hdr->contents
+ output_section->reloc_count);
elf_swap_reloca_out (output_bfd, &irela, erela);
}
++output_section->reloc_count;
return true;
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.