This is coffgen.c in view mode; [Download] [Up]
/* Support for the generic parts of COFF, for BFD.
Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
Written by Cygnus Support.
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. */
/* Most of this hacked by Steve Chamberlain, sac@cygnus.com.
Split out of coffcode.h by Ian Taylor, ian@cygnus.com. */
/* This file contains COFF code that is not dependent on any
particular COFF target. There is only one version of this file in
libbfd.a, so no target specific code may be put in here. Or, to
put it another way,
********** DO NOT PUT TARGET SPECIFIC CODE IN THIS FILE **********
If you need to add some target specific behaviour, add a new hook
function to bfd_coff_backend_data.
Some of these functions are also called by the ECOFF routines.
Those functions may not use any COFF specific information, such as
coff_data (abfd). */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "coff/internal.h"
#include "libcoff.h"
static boolean coff_write_symbol PARAMS ((bfd *, asymbol *,
combined_entry_type *,
unsigned int *));
static boolean coff_write_alien_symbol PARAMS ((bfd *, asymbol *,
unsigned int *));
static boolean coff_write_native_symbol PARAMS ((bfd *, coff_symbol_type *,
unsigned int *));
static asection bfd_debug_section = { "*DEBUG*" };
/* Take a section header read from a coff file (in HOST byte order),
and make a BFD "section" out of it. This is used by ECOFF. */
static boolean
make_a_section_from_file (abfd, hdr, target_index)
bfd *abfd;
struct internal_scnhdr *hdr;
unsigned int target_index;
{
asection *return_section;
char *name;
/* Assorted wastage to null-terminate the name, thanks AT&T! */
name = bfd_alloc(abfd, sizeof (hdr->s_name)+1);
if (name == NULL) {
bfd_set_error (bfd_error_no_memory);
return false;
}
strncpy(name, (char *) &hdr->s_name[0], sizeof (hdr->s_name));
name[sizeof (hdr->s_name)] = 0;
return_section = bfd_make_section(abfd, name);
if (return_section == NULL)
return_section = bfd_coff_make_section_hook (abfd, name);
/* Handle several sections of the same name. For example, if an executable
has two .bss sections, GDB better be able to find both of them
(PR 3562). */
if (return_section == NULL)
return_section = bfd_make_section_anyway (abfd, name);
if (return_section == NULL)
return false;
/* s_paddr is presumed to be = to s_vaddr */
return_section->vma = hdr->s_vaddr;
return_section->_raw_size = hdr->s_size;
return_section->filepos = hdr->s_scnptr;
return_section->rel_filepos = hdr->s_relptr;
return_section->reloc_count = hdr->s_nreloc;
bfd_coff_set_alignment_hook (abfd, return_section, hdr);
return_section->line_filepos = hdr->s_lnnoptr;
return_section->lineno_count = hdr->s_nlnno;
return_section->userdata = NULL;
return_section->next = (asection *) NULL;
return_section->flags = bfd_coff_styp_to_sec_flags_hook (abfd, hdr);
return_section->target_index = target_index;
/* At least on i386-coff, the line number count for a shared library
section must be ignored. */
if ((return_section->flags & SEC_SHARED_LIBRARY) != 0)
return_section->lineno_count = 0;
if (hdr->s_nreloc != 0)
return_section->flags |= SEC_RELOC;
/* FIXME: should this check 'hdr->s_size > 0' */
if (hdr->s_scnptr != 0)
return_section->flags |= SEC_HAS_CONTENTS;
return true;
}
/* Read in a COFF object and make it into a BFD. This is used by
ECOFF as well. */
static
bfd_target *
coff_real_object_p (abfd, nscns, internal_f, internal_a)
bfd *abfd;
unsigned nscns;
struct internal_filehdr *internal_f;
struct internal_aouthdr *internal_a;
{
PTR tdata;
size_t readsize; /* length of file_info */
unsigned int scnhsz;
char *external_sections;
/* Build a play area */
tdata = bfd_coff_mkobject_hook (abfd, (PTR) internal_f, (PTR) internal_a);
if (tdata == NULL)
return 0;
scnhsz = bfd_coff_scnhsz (abfd);
readsize = nscns * scnhsz;
external_sections = (char *)bfd_alloc(abfd, readsize);
if (!external_sections)
{
bfd_set_error (bfd_error_no_memory);
goto fail;
}
if (bfd_read((PTR)external_sections, 1, readsize, abfd) != readsize) {
goto fail;
}
/* Now copy data as required; construct all asections etc */
if (nscns != 0) {
unsigned int i;
for (i = 0; i < nscns; i++) {
struct internal_scnhdr tmp;
bfd_coff_swap_scnhdr_in(abfd, (PTR) (external_sections + i * scnhsz),
(PTR) &tmp);
make_a_section_from_file(abfd,&tmp, i+1);
}
}
/* make_abs_section(abfd);*/
if (bfd_coff_set_arch_mach_hook (abfd, (PTR) internal_f) == false)
goto fail;
if (!(internal_f->f_flags & F_RELFLG))
abfd->flags |= HAS_RELOC;
if ((internal_f->f_flags & F_EXEC))
abfd->flags |= EXEC_P;
if (!(internal_f->f_flags & F_LNNO))
abfd->flags |= HAS_LINENO;
if (!(internal_f->f_flags & F_LSYMS))
abfd->flags |= HAS_LOCALS;
bfd_get_symcount(abfd) = internal_f->f_nsyms;
if (internal_f->f_nsyms)
abfd->flags |= HAS_SYMS;
if (internal_a != (struct internal_aouthdr *) NULL)
bfd_get_start_address (abfd) = internal_a->entry;
else
bfd_get_start_address (abfd) = 0;
return abfd->xvec;
fail:
bfd_release(abfd, tdata);
return (bfd_target *)NULL;
}
/* Turn a COFF file into a BFD, but fail with bfd_error_wrong_format if it is
not a COFF file. This is also used by ECOFF. */
bfd_target *
coff_object_p (abfd)
bfd *abfd;
{
unsigned int filhsz;
unsigned int aoutsz;
int nscns;
PTR filehdr;
struct internal_filehdr internal_f;
struct internal_aouthdr internal_a;
/* figure out how much to read */
filhsz = bfd_coff_filhsz (abfd);
aoutsz = bfd_coff_aoutsz (abfd);
filehdr = bfd_alloc (abfd, filhsz);
if (filehdr == NULL)
return 0;
if (bfd_read(filehdr, 1, filhsz, abfd) != filhsz)
{
if (bfd_get_error () != bfd_error_system_call)
bfd_set_error (bfd_error_wrong_format);
return 0;
}
bfd_coff_swap_filehdr_in(abfd, filehdr, &internal_f);
bfd_release (abfd, filehdr);
if (bfd_coff_bad_format_hook (abfd, &internal_f) == false) {
bfd_set_error (bfd_error_wrong_format);
return 0;
}
nscns =internal_f.f_nscns;
if (internal_f.f_opthdr) {
PTR opthdr;
opthdr = bfd_alloc (abfd, aoutsz);
if (opthdr == NULL)
return 0;;
if (bfd_read(opthdr, 1,aoutsz, abfd) != aoutsz) {
return 0;
}
bfd_coff_swap_aouthdr_in(abfd, opthdr, (PTR)&internal_a);
}
/* Seek past the opt hdr stuff */
if (bfd_seek(abfd, (file_ptr) (internal_f.f_opthdr + filhsz), SEEK_SET)
!= 0)
return NULL;
return coff_real_object_p(abfd, nscns, &internal_f,
(internal_f.f_opthdr != 0
? &internal_a
: (struct internal_aouthdr *) NULL));
}
/* Get the BFD section from a COFF symbol section number. */
struct sec *
coff_section_from_bfd_index (abfd, index)
bfd *abfd;
int index;
{
struct sec *answer = abfd->sections;
if (index == N_ABS)
{
return &bfd_abs_section;
}
if (index == N_UNDEF)
{
return &bfd_und_section;
}
if(index == N_DEBUG)
{
return &bfd_debug_section;
}
while (answer) {
if (answer->target_index == index)
return answer;
answer = answer->next;
}
BFD_ASSERT(0);
return &bfd_und_section; /* For gcc -W and lint. Never executed. */
}
/* Get the upper bound of a COFF symbol table. */
long
coff_get_symtab_upper_bound(abfd)
bfd *abfd;
{
if (!bfd_coff_slurp_symbol_table(abfd))
return -1;
return (bfd_get_symcount(abfd) + 1) * (sizeof(coff_symbol_type *));
}
/* Canonicalize a COFF symbol table. */
long
coff_get_symtab (abfd, alocation)
bfd *abfd;
asymbol **alocation;
{
unsigned int counter = 0;
coff_symbol_type *symbase;
coff_symbol_type **location = (coff_symbol_type **) (alocation);
if (!bfd_coff_slurp_symbol_table(abfd))
return -1;
symbase = obj_symbols(abfd);
while (counter < bfd_get_symcount(abfd))
{
/* This nasty code looks at the symbol to decide whether or
not it is descibes a constructor/destructor entry point. It
is structured this way to (hopefully) speed non matches */
#if 0
if (0 && symbase->symbol.name[9] == '$')
{
bfd_constructor_entry(abfd,
(asymbol **)location,
symbase->symbol.name[10] == 'I' ?
"CTOR" : "DTOR");
}
#endif
*(location++) = symbase++;
counter++;
}
*location++ = 0;
return bfd_get_symcount(abfd);
}
/* Set lineno_count for the output sections of a COFF file. */
int
coff_count_linenumbers (abfd)
bfd *abfd;
{
unsigned int limit = bfd_get_symcount(abfd);
unsigned int i;
int total = 0;
asymbol **p;
{
asection *s = abfd->sections->output_section;
while (s) {
BFD_ASSERT(s->lineno_count == 0);
s = s->next;
}
}
for (p = abfd->outsymbols, i = 0; i < limit; i++, p++) {
asymbol *q_maybe = *p;
if (bfd_asymbol_flavour(q_maybe) == bfd_target_coff_flavour) {
coff_symbol_type *q = coffsymbol(q_maybe);
if (q->lineno) {
/*
This symbol has a linenumber, increment the owning
section's linenumber count
*/
alent *l = q->lineno;
q->symbol.section->output_section->lineno_count++;
total ++;
l++;
while (l->line_number) {
total ++;
q->symbol.section->output_section->lineno_count++;
l++;
}
}
}
}
return total;
}
/* Takes a bfd and a symbol, returns a pointer to the coff specific
area of the symbol if there is one. */
/*ARGSUSED*/
coff_symbol_type *
coff_symbol_from (ignore_abfd, symbol)
bfd *ignore_abfd;
asymbol *symbol;
{
if (bfd_asymbol_flavour(symbol) != bfd_target_coff_flavour)
return (coff_symbol_type *)NULL;
if (bfd_asymbol_bfd(symbol)->tdata.coff_obj_data == (coff_data_type*)NULL)
return (coff_symbol_type *)NULL;
return (coff_symbol_type *) symbol;
}
static void
fixup_symbol_value (coff_symbol_ptr, syment)
coff_symbol_type *coff_symbol_ptr;
struct internal_syment *syment;
{
/* Normalize the symbol flags */
if (bfd_is_com_section (coff_symbol_ptr->symbol.section)) {
/* a common symbol is undefined with a value */
syment->n_scnum = N_UNDEF;
syment->n_value = coff_symbol_ptr->symbol.value;
}
else if (coff_symbol_ptr->symbol.flags & BSF_DEBUGGING) {
syment->n_value = coff_symbol_ptr->symbol.value;
}
else if (coff_symbol_ptr->symbol.section == & bfd_und_section) {
syment->n_scnum = N_UNDEF;
syment->n_value = 0;
}
else {
if (coff_symbol_ptr->symbol.section) {
syment->n_scnum =
coff_symbol_ptr->symbol.section->output_section->target_index;
syment->n_value =
coff_symbol_ptr->symbol.value +
coff_symbol_ptr->symbol.section->output_offset +
coff_symbol_ptr->symbol.section->output_section->vma;
}
else {
BFD_ASSERT(0);
/* This can happen, but I don't know why yet (steve@cygnus.com) */
syment->n_scnum = N_ABS;
syment->n_value = coff_symbol_ptr->symbol.value;
}
}
}
/* run through all the symbols in the symbol table and work out what
their indexes into the symbol table will be when output
Coff requires that each C_FILE symbol points to the next one in the
chain, and that the last one points to the first external symbol. We
do that here too.
*/
boolean
coff_renumber_symbols (bfd_ptr)
bfd *bfd_ptr;
{
unsigned int symbol_count = bfd_get_symcount(bfd_ptr);
asymbol **symbol_ptr_ptr = bfd_ptr->outsymbols;
unsigned int native_index = 0;
struct internal_syment *last_file = (struct internal_syment *)NULL;
unsigned int symbol_index;
/* COFF demands that undefined symbols come after all other symbols.
Since we don't need to impose this extra knowledge on all our client
programs, deal with that here. Sort the symbol table; just move the
undefined symbols to the end, leaving the rest alone. */
/* @@ Do we have some condition we could test for, so we don't always
have to do this? I don't think relocatability is quite right, but
I'm not certain. [raeburn:19920508.1711EST] */
{
asymbol **newsyms;
int i;
newsyms = (asymbol **) bfd_alloc_by_size_t (bfd_ptr,
sizeof (asymbol *)
* (symbol_count + 1));
if (!newsyms)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
bfd_ptr->outsymbols = newsyms;
for (i = 0; i < symbol_count; i++)
if (symbol_ptr_ptr[i]->section != &bfd_und_section)
*newsyms++ = symbol_ptr_ptr[i];
for (i = 0; i < symbol_count; i++)
if (symbol_ptr_ptr[i]->section == &bfd_und_section)
*newsyms++ = symbol_ptr_ptr[i];
*newsyms = (asymbol *) NULL;
symbol_ptr_ptr = bfd_ptr->outsymbols;
}
for (symbol_index = 0; symbol_index < symbol_count; symbol_index++)
{
coff_symbol_type *coff_symbol_ptr = coff_symbol_from(bfd_ptr, symbol_ptr_ptr[symbol_index]);
if (coff_symbol_ptr && coff_symbol_ptr->native) {
combined_entry_type *s = coff_symbol_ptr->native;
int i;
if (s->u.syment.n_sclass == C_FILE)
{
if (last_file != (struct internal_syment *)NULL) {
last_file->n_value = native_index;
}
last_file = &(s->u.syment);
}
else {
/* Modify the symbol values according to their section and
type */
fixup_symbol_value(coff_symbol_ptr, &(s->u.syment));
}
for (i = 0; i < s->u.syment.n_numaux + 1; i++) {
s[i].offset = native_index ++;
}
}
else {
native_index++;
}
}
obj_conv_table_size (bfd_ptr) = native_index;
return true;
}
/*
Run thorough the symbol table again, and fix it so that all pointers to
entries are changed to the entries' index in the output symbol table.
*/
void
coff_mangle_symbols (bfd_ptr)
bfd *bfd_ptr;
{
unsigned int symbol_count = bfd_get_symcount (bfd_ptr);
asymbol **symbol_ptr_ptr = bfd_ptr->outsymbols;
unsigned int symbol_index;
for (symbol_index = 0; symbol_index < symbol_count; symbol_index++)
{
coff_symbol_type *coff_symbol_ptr =
coff_symbol_from (bfd_ptr, symbol_ptr_ptr[symbol_index]);
if (coff_symbol_ptr && coff_symbol_ptr->native)
{
int i;
combined_entry_type *s = coff_symbol_ptr->native;
if (s->fix_value)
{
/* FIXME: We should use a union here. */
s->u.syment.n_value =
((combined_entry_type *) s->u.syment.n_value)->offset;
s->fix_value = 0;
}
for (i = 0; i < s->u.syment.n_numaux ; i++)
{
combined_entry_type *a = s + i + 1;
if (a->fix_tag)
{
a->u.auxent.x_sym.x_tagndx.l =
a->u.auxent.x_sym.x_tagndx.p->offset;
a->fix_tag = 0;
}
if (a->fix_end)
{
a->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.l =
a->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.p->offset;
a->fix_end = 0;
}
if (a->fix_scnlen)
{
a->u.auxent.x_csect.x_scnlen.l =
a->u.auxent.x_csect.x_scnlen.p->offset;
a->fix_scnlen = 0;
}
}
}
}
}
static bfd_size_type string_size;
static bfd_size_type debug_string_size;
static asection *debug_string_section;
static void
coff_fix_symbol_name (abfd, symbol, native)
bfd *abfd;
asymbol *symbol;
combined_entry_type *native;
{
unsigned int name_length;
union internal_auxent *auxent;
char * name = ( char *)(symbol->name);
if (name == (char *) NULL) {
/* coff symbols always have names, so we'll make one up */
symbol->name = "strange";
name = (char *)symbol->name;
}
name_length = strlen(name);
if (native->u.syment.n_sclass == C_FILE) {
strncpy(native->u.syment._n._n_name, ".file", SYMNMLEN);
auxent = &(native+1)->u.auxent;
if (bfd_coff_long_filenames (abfd)) {
if (name_length <= FILNMLEN) {
strncpy(auxent->x_file.x_fname, name, FILNMLEN);
}
else {
auxent->x_file.x_n.x_offset = string_size + 4;
auxent->x_file.x_n.x_zeroes = 0;
string_size += name_length + 1;
}
}
else {
strncpy(auxent->x_file.x_fname, name, FILNMLEN);
if (name_length > FILNMLEN) {
name[FILNMLEN] = '\0';
}
}
}
else
{ /* NOT A C_FILE SYMBOL */
if (name_length <= SYMNMLEN)
{
/* This name will fit into the symbol neatly */
strncpy(native->u.syment._n._n_name, symbol->name, SYMNMLEN);
}
else if (! bfd_coff_symname_in_debug (abfd, &native->u.syment))
{
native->u.syment._n._n_n._n_offset = string_size + 4;
native->u.syment._n._n_n._n_zeroes = 0;
string_size += name_length + 1;
}
else
{
long filepos;
bfd_byte buf[2];
/* This name should be written into the .debug section. For
some reason each name is preceded by a two byte length
and also followed by a null byte. FIXME: We assume that
the .debug section has already been created, and that it
is large enough. */
if (debug_string_section == (asection *) NULL)
debug_string_section = bfd_get_section_by_name (abfd, ".debug");
filepos = bfd_tell (abfd);
bfd_put_16 (abfd, name_length + 1, buf);
if (! bfd_set_section_contents (abfd,
debug_string_section,
(PTR) buf,
(file_ptr) debug_string_size,
(bfd_size_type) 2)
|| ! bfd_set_section_contents (abfd,
debug_string_section,
(PTR) symbol->name,
(file_ptr) debug_string_size + 2,
(bfd_size_type) name_length + 1))
abort ();
if (bfd_seek (abfd, filepos, SEEK_SET) != 0)
abort ();
native->u.syment._n._n_n._n_offset = debug_string_size + 2;
native->u.syment._n._n_n._n_zeroes = 0;
debug_string_size += name_length + 3;
}
}
}
/* We need to keep track of the symbol index so that when we write out
the relocs we can get the index for a symbol. This method is a
hack. FIXME. */
#define set_index(symbol, idx) ((symbol)->udata = (PTR) (idx))
/* Write a symbol out to a COFF file. */
static boolean
coff_write_symbol (abfd, symbol, native, written)
bfd *abfd;
asymbol *symbol;
combined_entry_type *native;
unsigned int *written;
{
unsigned int numaux = native->u.syment.n_numaux;
int type = native->u.syment.n_type;
int class = native->u.syment.n_sclass;
PTR buf;
bfd_size_type symesz;
/* @@ bfd_debug_section isn't accessible outside this file, but we
know that C_FILE symbols belong there. So move them. */
if (native->u.syment.n_sclass == C_FILE)
symbol->section = &bfd_debug_section;
if (symbol->section == &bfd_abs_section)
{
native->u.syment.n_scnum = N_ABS;
}
else if (symbol->section == &bfd_debug_section)
{
native->u.syment.n_scnum = N_DEBUG;
}
else if (symbol->section == &bfd_und_section)
{
native->u.syment.n_scnum = N_UNDEF;
}
else
{
native->u.syment.n_scnum =
symbol->section->output_section->target_index;
}
coff_fix_symbol_name (abfd, symbol, native);
symesz = bfd_coff_symesz (abfd);
buf = bfd_alloc (abfd, symesz);
if (!buf)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
bfd_coff_swap_sym_out (abfd, &native->u.syment, buf);
if (bfd_write (buf, 1, symesz, abfd) != symesz)
return false;
bfd_release (abfd, buf);
if (native->u.syment.n_numaux > 0)
{
bfd_size_type auxesz;
unsigned int j;
auxesz = bfd_coff_auxesz (abfd);
buf = bfd_alloc (abfd, auxesz);
if (!buf)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
for (j = 0; j < native->u.syment.n_numaux; j++)
{
bfd_coff_swap_aux_out (abfd,
&((native + j + 1)->u.auxent),
type,
class,
j,
native->u.syment.n_numaux,
buf);
if (bfd_write (buf, 1, auxesz, abfd)!= auxesz)
return false;
}
bfd_release (abfd, buf);
}
/* Store the index for use when we write out the relocs. */
set_index (symbol, *written);
*written += numaux + 1;
return true;
}
/* Write out a symbol to a COFF file that does not come from a COFF
file originally. This symbol may have been created by the linker,
or we may be linking a non COFF file to a COFF file. */
static boolean
coff_write_alien_symbol (abfd, symbol, written)
bfd *abfd;
asymbol *symbol;
unsigned int *written;
{
combined_entry_type *native;
combined_entry_type dummy;
native = &dummy;
native->u.syment.n_type = T_NULL;
native->u.syment.n_flags = 0;
if (symbol->section == &bfd_und_section)
{
native->u.syment.n_scnum = N_UNDEF;
native->u.syment.n_value = symbol->value;
}
else if (bfd_is_com_section (symbol->section))
{
native->u.syment.n_scnum = N_UNDEF;
native->u.syment.n_value = symbol->value;
}
else if (symbol->flags & BSF_DEBUGGING)
{
/* Remove the symbol name so that it does not take up any space.
COFF won't know what to do with it anyhow. */
symbol->name = "";
}
else
{
native->u.syment.n_scnum =
symbol->section->output_section->target_index;
native->u.syment.n_value = (symbol->value
+ symbol->section->output_section->vma
+ symbol->section->output_offset);
/* Copy the any flags from the the file header into the symbol.
FIXME: Why? */
{
coff_symbol_type *c = coff_symbol_from (abfd, symbol);
if (c != (coff_symbol_type *) NULL)
native->u.syment.n_flags = bfd_asymbol_bfd (&c->symbol)->flags;
}
}
native->u.syment.n_type = 0;
if (symbol->flags & BSF_LOCAL)
native->u.syment.n_sclass = C_STAT;
else
native->u.syment.n_sclass = C_EXT;
native->u.syment.n_numaux = 0;
return coff_write_symbol (abfd, symbol, native, written);
}
/* Write a native symbol to a COFF file. */
static boolean
coff_write_native_symbol (abfd, symbol, written)
bfd *abfd;
coff_symbol_type *symbol;
unsigned int *written;
{
combined_entry_type *native = symbol->native;
alent *lineno = symbol->lineno;
/* If this symbol has an associated line number, we must store the
symbol index in the line number field. We also tag the auxent to
point to the right place in the lineno table. */
if (lineno && !symbol->done_lineno)
{
unsigned int count = 0;
lineno[count].u.offset = *written;
if (native->u.syment.n_numaux)
{
union internal_auxent *a = &((native+1)->u.auxent);
a->x_sym.x_fcnary.x_fcn.x_lnnoptr =
symbol->symbol.section->output_section->moving_line_filepos;
}
/* Count and relocate all other linenumbers. */
count++;
while (lineno[count].line_number != 0)
{
#if 0
/* 13 april 92. sac
I've been told this, but still need proof:
> The second bug is also in `bfd/coffcode.h'. This bug
> causes the linker to screw up the pc-relocations for
> all the line numbers in COFF code. This bug isn't only
> specific to A29K implementations, but affects all
> systems using COFF format binaries. Note that in COFF
> object files, the line number core offsets output by
> the assembler are relative to the start of each
> procedure, not to the start of the .text section. This
> patch relocates the line numbers relative to the
> `native->u.syment.n_value' instead of the section
> virtual address.
> modular!olson@cs.arizona.edu (Jon Olson)
*/
lineno[count].u.offset += native->u.syment.n_value;
#else
lineno[count].u.offset +=
(symbol->symbol.section->output_section->vma
+ symbol->symbol.section->output_offset);
#endif
count++;
}
symbol->done_lineno = true;
symbol->symbol.section->output_section->moving_line_filepos +=
count * bfd_coff_linesz (abfd);
}
return coff_write_symbol (abfd, &(symbol->symbol), native, written);
}
/* Write out the COFF symbols. */
boolean
coff_write_symbols (abfd)
bfd *abfd;
{
unsigned int i;
unsigned int limit = bfd_get_symcount(abfd);
unsigned int written = 0;
asymbol **p;
string_size = 0;
debug_string_size = 0;
/* Seek to the right place */
if (bfd_seek (abfd, obj_sym_filepos(abfd), SEEK_SET) != 0)
return false;
/* Output all the symbols we have */
written = 0;
for (p = abfd->outsymbols, i = 0; i < limit; i++, p++)
{
asymbol *symbol = *p;
coff_symbol_type *c_symbol = coff_symbol_from (abfd, symbol);
if (c_symbol == (coff_symbol_type *) NULL
|| c_symbol->native == (combined_entry_type *)NULL)
{
if (! coff_write_alien_symbol (abfd, symbol, &written))
return false;
}
else
{
if (! coff_write_native_symbol (abfd, c_symbol, &written))
return false;
}
}
bfd_get_symcount (abfd) = written;
/* Now write out strings */
if (string_size != 0)
{
unsigned int size = string_size + 4;
bfd_byte buffer[4];
bfd_h_put_32 (abfd, size, buffer);
if (bfd_write ((PTR) buffer, 1, sizeof (buffer), abfd) != sizeof (buffer))
return false;
for (p = abfd->outsymbols, i = 0;
i < limit;
i++, p++)
{
asymbol *q = *p;
size_t name_length = strlen (q->name);
coff_symbol_type *c_symbol = coff_symbol_from (abfd, q);
size_t maxlen;
/* Figure out whether the symbol name should go in the string
table. Symbol names that are short enough are stored
directly in the syment structure. File names permit a
different, longer, length in the syment structure. On
XCOFF, some symbol names are stored in the .debug section
rather than in the string table. */
if (c_symbol == NULL
|| c_symbol->native == NULL)
{
/* This is not a COFF symbol, so it certainly is not a
file name, nor does it go in the .debug section. */
maxlen = SYMNMLEN;
}
else if (bfd_coff_symname_in_debug (abfd,
&c_symbol->native->u.syment))
{
/* This symbol name is in the XCOFF .debug section.
Don't write it into the string table. */
maxlen = name_length;
}
else if (c_symbol->native->u.syment.n_sclass == C_FILE)
maxlen = FILNMLEN;
else
maxlen = SYMNMLEN;
if (name_length > maxlen)
{
if (bfd_write ((PTR) (q->name), 1, name_length + 1, abfd)
!= name_length + 1)
return false;
}
}
}
else
{
/* We would normally not write anything here, but we'll write
out 4 so that any stupid coff reader which tries to read the
string table even when there isn't one won't croak. */
unsigned int size = 4;
bfd_byte buffer[4];
bfd_h_put_32 (abfd, size, buffer);
if (bfd_write ((PTR) buffer, 1, 4, abfd) != 4)
return false;
}
/* Make sure the .debug section was created to be the correct size.
We should create it ourselves on the fly, but we don't because
BFD won't let us write to any section until we know how large all
the sections are. We could still do it by making another pass
over the symbols. FIXME. */
BFD_ASSERT (debug_string_size == 0
|| (debug_string_section != (asection *) NULL
&& (BFD_ALIGN (debug_string_size,
1 << debug_string_section->alignment_power)
== bfd_section_size (abfd, debug_string_section))));
return true;
}
boolean
coff_write_linenumbers (abfd)
bfd *abfd;
{
asection *s;
bfd_size_type linesz;
PTR buff;
linesz = bfd_coff_linesz (abfd);
buff = bfd_alloc (abfd, linesz);
if (!buff)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
for (s = abfd->sections; s != (asection *) NULL; s = s->next) {
if (s->lineno_count) {
asymbol **q = abfd->outsymbols;
if (bfd_seek(abfd, s->line_filepos, SEEK_SET) != 0)
return false;
/* Find all the linenumbers in this section */
while (*q) {
asymbol *p = *q;
if (p->section->output_section == s) {
alent *l =
BFD_SEND(bfd_asymbol_bfd(p), _get_lineno, (bfd_asymbol_bfd(p), p));
if (l) {
/* Found a linenumber entry, output */
struct internal_lineno out;
memset( (PTR)&out, 0, sizeof(out));
out.l_lnno = 0;
out.l_addr.l_symndx = l->u.offset;
bfd_coff_swap_lineno_out(abfd, &out, buff);
if (bfd_write(buff, 1, linesz, abfd) != linesz)
return false;
l++;
while (l->line_number) {
out.l_lnno = l->line_number;
out.l_addr.l_symndx = l->u.offset;
bfd_coff_swap_lineno_out(abfd, &out, buff);
if (bfd_write(buff, 1, linesz, abfd) != linesz)
return false;
l++;
}
}
}
q++;
}
}
}
bfd_release (abfd, buff);
return true;
}
/*ARGSUSED*/
alent *
coff_get_lineno (ignore_abfd, symbol)
bfd *ignore_abfd;
asymbol *symbol;
{
return coffsymbol(symbol)->lineno;
}
asymbol *
coff_section_symbol (abfd, name)
bfd *abfd;
char *name;
{
asection *sec = bfd_make_section_old_way (abfd, name);
asymbol *sym;
combined_entry_type *csym;
sym = sec->symbol;
csym = coff_symbol_from (abfd, sym)->native;
/* Make sure back-end COFF stuff is there. */
if (csym == 0)
{
struct foo {
coff_symbol_type sym;
/* @@FIXME This shouldn't use a fixed size!! */
combined_entry_type e[10];
};
struct foo *f;
f = (struct foo *) bfd_alloc_by_size_t (abfd, sizeof (*f));
if (!f)
{
bfd_set_error (bfd_error_no_error);
return NULL;
}
memset ((char *) f, 0, sizeof (*f));
coff_symbol_from (abfd, sym)->native = csym = f->e;
}
csym[0].u.syment.n_sclass = C_STAT;
csym[0].u.syment.n_numaux = 1;
/* SF_SET_STATICS (sym); @@ ??? */
csym[1].u.auxent.x_scn.x_scnlen = sec->_raw_size;
csym[1].u.auxent.x_scn.x_nreloc = sec->reloc_count;
csym[1].u.auxent.x_scn.x_nlinno = sec->lineno_count;
if (sec->output_section == NULL)
{
sec->output_section = sec;
sec->output_offset = 0;
}
return sym;
}
/* This function transforms the offsets into the symbol table into
pointers to syments. */
static void
coff_pointerize_aux (abfd, table_base, type, class, auxent)
bfd *abfd;
combined_entry_type *table_base;
int type;
int class;
combined_entry_type *auxent;
{
/* Don't bother if this is a file or a section */
if (class == C_STAT && type == T_NULL) return;
if (class == C_FILE) return;
/* Otherwise patch up */
#define N_TMASK coff_data (abfd)->local_n_tmask
#define N_BTSHFT coff_data (abfd)->local_n_btshft
if (ISFCN(type) || ISTAG(class) || class == C_BLOCK) {
auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.p = table_base +
auxent->u.auxent.x_sym.x_fcnary.x_fcn.x_endndx.l;
auxent->fix_end = 1;
}
/* A negative tagndx is meaningless, but the SCO 3.2v4 cc can
generate one, so we must be careful to ignore it. */
if (auxent->u.auxent.x_sym.x_tagndx.l > 0) {
auxent->u.auxent.x_sym.x_tagndx.p =
table_base + auxent->u.auxent.x_sym.x_tagndx.l;
auxent->fix_tag = 1;
}
}
static char *
build_string_table (abfd)
bfd *abfd;
{
char string_table_size_buffer[4];
unsigned int string_table_size;
char *string_table;
/* At this point we should be "seek"'d to the end of the
symbols === the symbol table size. */
if (bfd_read((char *) string_table_size_buffer,
sizeof(string_table_size_buffer),
1, abfd) != sizeof(string_table_size))
return (NULL);
string_table_size = bfd_h_get_32(abfd, (bfd_byte *) string_table_size_buffer);
if ((string_table = (PTR) bfd_alloc(abfd, string_table_size -= 4)) == NULL) {
bfd_set_error (bfd_error_no_memory);
return (NULL);
} /* on mallocation error */
if (bfd_read(string_table, string_table_size, 1, abfd) != string_table_size)
return (NULL);
return string_table;
}
/* Allocate space for the ".debug" section, and read it.
We did not read the debug section until now, because
we didn't want to go to the trouble until someone needed it. */
static char *
build_debug_section (abfd)
bfd *abfd;
{
char *debug_section;
long position;
asection *sect = bfd_get_section_by_name (abfd, ".debug");
if (!sect) {
bfd_set_error (bfd_error_no_debug_section);
return NULL;
}
debug_section = (PTR) bfd_alloc (abfd,
bfd_get_section_size_before_reloc (sect));
if (debug_section == NULL) {
bfd_set_error (bfd_error_no_memory);
return NULL;
}
/* Seek to the beginning of the `.debug' section and read it.
Save the current position first; it is needed by our caller.
Then read debug section and reset the file pointer. */
position = bfd_tell (abfd);
if (bfd_seek (abfd, sect->filepos, SEEK_SET) != 0
|| (bfd_read (debug_section,
bfd_get_section_size_before_reloc (sect), 1, abfd)
!= bfd_get_section_size_before_reloc(sect))
|| bfd_seek (abfd, position, SEEK_SET) != 0)
return NULL;
return debug_section;
}
/* Return a pointer to a malloc'd copy of 'name'. 'name' may not be
\0-terminated, but will not exceed 'maxlen' characters. The copy *will*
be \0-terminated. */
static char *
copy_name (abfd, name, maxlen)
bfd *abfd;
char *name;
int maxlen;
{
int len;
char *newname;
for (len = 0; len < maxlen; ++len) {
if (name[len] == '\0') {
break;
}
}
if ((newname = (PTR) bfd_alloc(abfd, len+1)) == NULL) {
bfd_set_error (bfd_error_no_memory);
return (NULL);
}
strncpy(newname, name, len);
newname[len] = '\0';
return newname;
}
/* Read a symbol table into freshly bfd_allocated memory, swap it, and
knit the symbol names into a normalized form. By normalized here I
mean that all symbols have an n_offset pointer that points to a null-
terminated string. */
combined_entry_type *
coff_get_normalized_symtab (abfd)
bfd *abfd;
{
combined_entry_type *internal;
combined_entry_type *internal_ptr;
combined_entry_type *symbol_ptr;
combined_entry_type *internal_end;
bfd_size_type symesz;
PTR raw;
char *raw_src;
char *raw_end;
char *string_table = NULL;
char *debug_section = NULL;
unsigned long size;
unsigned int raw_size;
if (obj_raw_syments(abfd) != (combined_entry_type *)NULL) {
return obj_raw_syments(abfd);
}
if ((size = bfd_get_symcount(abfd) * sizeof(combined_entry_type)) == 0) {
bfd_set_error (bfd_error_no_symbols);
return (NULL);
}
internal = (combined_entry_type *)bfd_alloc(abfd, size);
if (!internal)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
internal_end = internal + bfd_get_symcount(abfd);
symesz = bfd_coff_symesz (abfd);
raw_size = bfd_get_symcount(abfd) * symesz;
raw = bfd_alloc(abfd,raw_size);
if (!raw)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
if (bfd_seek(abfd, obj_sym_filepos(abfd), SEEK_SET) == -1
|| bfd_read(raw, raw_size, 1, abfd) != raw_size)
return (NULL);
/* mark the end of the symbols */
raw_end = (char *) raw + bfd_get_symcount(abfd) * symesz;
/*
FIXME SOMEDAY. A string table size of zero is very weird, but
probably possible. If one shows up, it will probably kill us.
*/
/* Swap all the raw entries */
for (raw_src = (char *) raw, internal_ptr = internal;
raw_src < raw_end;
raw_src += symesz, internal_ptr++) {
unsigned int i;
bfd_coff_swap_sym_in(abfd, (PTR)raw_src, (PTR)&internal_ptr->u.syment);
internal_ptr->fix_value = 0;
internal_ptr->fix_tag = 0;
internal_ptr->fix_end = 0;
internal_ptr->fix_scnlen = 0;
symbol_ptr = internal_ptr;
for (i = 0;
i < symbol_ptr->u.syment.n_numaux;
i++)
{
internal_ptr++;
raw_src += symesz;
internal_ptr->fix_value = 0;
internal_ptr->fix_tag = 0;
internal_ptr->fix_end = 0;
internal_ptr->fix_scnlen = 0;
bfd_coff_swap_aux_in(abfd, (PTR) raw_src,
symbol_ptr->u.syment.n_type,
symbol_ptr->u.syment.n_sclass,
i, symbol_ptr->u.syment.n_numaux,
&(internal_ptr->u.auxent));
/* Remember that bal entries arn't pointerized */
if (i != 1 || symbol_ptr->u.syment.n_sclass != C_LEAFPROC)
{
coff_pointerize_aux(abfd,
internal,
symbol_ptr->u.syment.n_type,
symbol_ptr->u.syment.n_sclass,
internal_ptr);
}
}
}
/* Free all the raw stuff */
bfd_release(abfd, raw);
for (internal_ptr = internal; internal_ptr < internal_end;
internal_ptr ++)
{
if (internal_ptr->u.syment.n_sclass == C_FILE) {
/* make a file symbol point to the name in the auxent, since
the text ".file" is redundant */
if ((internal_ptr+1)->u.auxent.x_file.x_n.x_zeroes == 0) {
/* the filename is a long one, point into the string table */
if (string_table == NULL) {
string_table = build_string_table(abfd);
}
internal_ptr->u.syment._n._n_n._n_offset =
(long) (string_table - 4 +
(internal_ptr+1)->u.auxent.x_file.x_n.x_offset);
}
else {
/* ordinary short filename, put into memory anyway */
internal_ptr->u.syment._n._n_n._n_offset = (long)
copy_name(abfd, (internal_ptr+1)->u.auxent.x_file.x_fname,
FILNMLEN);
}
}
else {
if (internal_ptr->u.syment._n._n_n._n_zeroes != 0) {
/* This is a "short" name. Make it long. */
unsigned long i = 0;
char *newstring = NULL;
/* find the length of this string without walking into memory
that isn't ours. */
for (i = 0; i < 8; ++i) {
if (internal_ptr->u.syment._n._n_name[i] == '\0') {
break;
} /* if end of string */
} /* possible lengths of this string. */
if ((newstring = (PTR) bfd_alloc(abfd, ++i)) == NULL) {
bfd_set_error (bfd_error_no_memory);
return (NULL);
} /* on error */
memset(newstring, 0, i);
strncpy(newstring, internal_ptr->u.syment._n._n_name, i-1);
internal_ptr->u.syment._n._n_n._n_offset = (long int) newstring;
internal_ptr->u.syment._n._n_n._n_zeroes = 0;
}
else if (internal_ptr->u.syment._n._n_n._n_offset == 0)
internal_ptr->u.syment._n._n_n._n_offset = (long int) "";
else if (!bfd_coff_symname_in_debug(abfd, &internal_ptr->u.syment)) {
/* Long name already. Point symbol at the string in the table. */
if (string_table == NULL) {
string_table = build_string_table(abfd);
}
internal_ptr->u.syment._n._n_n._n_offset = (long int)
(string_table - 4 + internal_ptr->u.syment._n._n_n._n_offset);
}
else {
/* Long name in debug section. Very similar. */
if (debug_section == NULL) {
debug_section = build_debug_section(abfd);
}
internal_ptr->u.syment._n._n_n._n_offset = (long int)
(debug_section + internal_ptr->u.syment._n._n_n._n_offset);
}
}
internal_ptr += internal_ptr->u.syment.n_numaux;
}
obj_raw_syments(abfd) = internal;
obj_raw_syment_count(abfd) = internal_ptr - internal;
return (internal);
} /* coff_get_normalized_symtab() */
long
coff_get_reloc_upper_bound (abfd, asect)
bfd *abfd;
sec_ptr asect;
{
if (bfd_get_format(abfd) != bfd_object) {
bfd_set_error (bfd_error_invalid_operation);
return -1;
}
return (asect->reloc_count + 1) * sizeof(arelent *);
}
asymbol *
coff_make_empty_symbol (abfd)
bfd *abfd;
{
coff_symbol_type *new = (coff_symbol_type *) bfd_alloc(abfd, sizeof(coff_symbol_type));
if (new == NULL) {
bfd_set_error (bfd_error_no_memory);
return (NULL);
} /* on error */
memset (new, 0, sizeof *new);
new->symbol.section = 0;
new->native = 0;
new->lineno = (alent *) NULL;
new->done_lineno = false;
new->symbol.the_bfd = abfd;
return &new->symbol;
}
/* Make a debugging symbol. */
asymbol *
coff_bfd_make_debug_symbol (abfd, ptr, sz)
bfd *abfd;
PTR ptr;
unsigned long sz;
{
coff_symbol_type *new = (coff_symbol_type *) bfd_alloc(abfd, sizeof(coff_symbol_type));
if (new == NULL) {
bfd_set_error (bfd_error_no_memory);
return (NULL);
} /* on error */
/* @@ This shouldn't be using a constant multiplier. */
new->native = (combined_entry_type *) bfd_zalloc (abfd, sizeof (combined_entry_type) * 10);
if (!new->native)
{
bfd_set_error (bfd_error_no_memory);
return (NULL);
} /* on error */
new->symbol.section = &bfd_debug_section;
new->lineno = (alent *) NULL;
new->done_lineno = false;
new->symbol.the_bfd = abfd;
return &new->symbol;
}
/*ARGSUSED*/
void
coff_get_symbol_info (abfd, symbol, ret)
bfd *abfd;
asymbol *symbol;
symbol_info *ret;
{
bfd_symbol_info (symbol, ret);
}
/* Print out information about COFF symbol. */
void
coff_print_symbol (abfd, filep, symbol, how)
bfd *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, "coff %s %s",
coffsymbol(symbol)->native ? "n" : "g",
coffsymbol(symbol)->lineno ? "l" : " ");
break;
case bfd_print_symbol_all:
if (coffsymbol(symbol)->native)
{
unsigned int aux;
combined_entry_type *combined = coffsymbol (symbol)->native;
combined_entry_type *root = obj_raw_syments (abfd);
struct lineno_cache_entry *l = coffsymbol(symbol)->lineno;
fprintf (file,"[%3d]", combined - root);
fprintf (file,
"(sc %2d)(fl 0x%02x)(ty %3x)(sc %3d) (nx %d) 0x%08lx %s",
combined->u.syment.n_scnum,
combined->u.syment.n_flags,
combined->u.syment.n_type,
combined->u.syment.n_sclass,
combined->u.syment.n_numaux,
(unsigned long) combined->u.syment.n_value,
symbol->name);
for (aux = 0; aux < combined->u.syment.n_numaux; aux++)
{
combined_entry_type *auxp = combined + aux + 1;
long tagndx;
if (auxp->fix_tag)
tagndx = auxp->u.auxent.x_sym.x_tagndx.p - root;
else
tagndx = auxp->u.auxent.x_sym.x_tagndx.l;
fprintf (file, "\n");
switch (combined->u.syment.n_sclass)
{
case C_FILE:
fprintf (file, "File ");
break;
default:
fprintf (file, "AUX lnno %d size 0x%x tagndx %ld",
auxp->u.auxent.x_sym.x_misc.x_lnsz.x_lnno,
auxp->u.auxent.x_sym.x_misc.x_lnsz.x_size,
tagndx);
break;
}
}
if (l)
{
fprintf (file, "\n%s :", l->u.sym->name);
l++;
while (l->line_number)
{
fprintf (file, "\n%4d : 0x%lx",
l->line_number,
((unsigned long)
(l->u.offset + symbol->section->vma)));
l++;
}
}
}
else
{
bfd_print_symbol_vandf ((PTR) file, symbol);
fprintf (file, " %-5s %s %s %s",
symbol->section->name,
coffsymbol(symbol)->native ? "n" : "g",
coffsymbol(symbol)->lineno ? "l" : " ",
symbol->name);
}
}
}
/* Provided a BFD, a section and an offset into the section, calculate
and return the name of the source file and the line nearest to the
wanted location. */
/*ARGSUSED*/
boolean
coff_find_nearest_line (abfd, section, ignore_symbols, offset, filename_ptr,
functionname_ptr, line_ptr)
bfd *abfd;
asection *section;
asymbol **ignore_symbols;
bfd_vma offset;
CONST char **filename_ptr;
CONST char **functionname_ptr;
unsigned int *line_ptr;
{
static bfd *cache_abfd;
static asection *cache_section;
static bfd_vma cache_offset;
static unsigned int cache_i;
static CONST char *cache_function;
static unsigned int line_base = 0;
unsigned int i = 0;
coff_data_type *cof = coff_data(abfd);
/* Run through the raw syments if available */
combined_entry_type *p;
alent *l;
*filename_ptr = 0;
*functionname_ptr = 0;
*line_ptr = 0;
/* Don't try and find line numbers in a non coff file */
if (abfd->xvec->flavour != bfd_target_coff_flavour)
return false;
if (cof == NULL)
return false;
p = cof->raw_syments;
for (i = 0; i < cof->raw_syment_count; i++) {
if (p->u.syment.n_sclass == C_FILE) {
/* File name has been moved into symbol */
*filename_ptr = (char *) p->u.syment._n._n_n._n_offset;
break;
}
p += 1 + p->u.syment.n_numaux;
}
/* Now wander though the raw linenumbers of the section */
/*
If this is the same BFD as we were previously called with and this is
the same section, and the offset we want is further down then we can
prime the lookup loop
*/
if (abfd == cache_abfd &&
section == cache_section &&
offset >= cache_offset) {
i = cache_i;
*functionname_ptr = cache_function;
}
else {
i = 0;
}
l = §ion->lineno[i];
for (; i < section->lineno_count; i++) {
if (l->line_number == 0) {
/* Get the symbol this line number points at */
coff_symbol_type *coff = (coff_symbol_type *) (l->u.sym);
if (coff->symbol.value > offset)
break;
*functionname_ptr = coff->symbol.name;
if (coff->native) {
combined_entry_type *s = coff->native;
s = s + 1 + s->u.syment.n_numaux;
/*
S should now point to the .bf of the function
*/
if (s->u.syment.n_numaux) {
/*
The linenumber is stored in the auxent
*/
union internal_auxent *a = &((s + 1)->u.auxent);
line_base = a->x_sym.x_misc.x_lnsz.x_lnno;
*line_ptr = line_base;
}
}
}
else {
if (l->u.offset > offset)
break;
*line_ptr = l->line_number + line_base - 1;
}
l++;
}
cache_abfd = abfd;
cache_section = section;
cache_offset = offset;
cache_i = i;
cache_function = *functionname_ptr;
return true;
}
int
coff_sizeof_headers (abfd, reloc)
bfd *abfd;
boolean reloc;
{
size_t size;
if (reloc == false) {
size = bfd_coff_filhsz (abfd) + bfd_coff_aoutsz (abfd);
}
else {
size = bfd_coff_filhsz (abfd);
}
size += abfd->section_count * bfd_coff_scnhsz (abfd);
return size;
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.