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/* SOM object file format.
Copyright (C) 1993 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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,
or (at your option) any later version.
GAS 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 GAS; see the file COPYING. If not, write
to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
Written by the Center for Software Science at the University of Utah
and by Cygnus Support. */
#include "as.h"
#include "subsegs.h"
#include "aout/stab_gnu.h"
#include "obstack.h"
/* SOM does not need any pseudo-ops. */
const pseudo_typeS obj_pseudo_table[] =
{
{NULL}
};
static int version_seen = 0;
static int copyright_seen = 0;
/* Unused by SOM. */
void obj_read_begin_hook () {}
/* Handle a .version directive. */
void
obj_som_version (unused)
int unused;
{
char *version, c;
if (version_seen)
{
as_bad ("Only one .version pseudo-op per file!");
ignore_rest_of_line ();
return;
}
SKIP_WHITESPACE ();
if (*input_line_pointer == '\"')
{
version = input_line_pointer;
++input_line_pointer;
while (is_a_char (next_char_of_string ()))
;
c = *input_line_pointer;
*input_line_pointer = '\000';
}
else
{
as_bad ("Expected quoted string");
ignore_rest_of_line ();
return;
}
version_seen = 1;
if (bfd_som_attach_aux_hdr (stdoutput, VERSION_AUX_ID, version) == false)
{
bfd_perror (stdoutput->filename);
as_perror ("FATAL: Attaching version header %s", stdoutput->filename);
exit (42);
}
*input_line_pointer = c;
demand_empty_rest_of_line ();
}
/* Handle a .copyright directive. This probably isn't complete, but
it's of dubious value anyway and (IMHO) not worth the time to finish.
If you care about copyright strings that much, you fix it. */
void
obj_som_copyright (unused)
int unused;
{
char *copyright, c;
if (copyright_seen)
{
as_bad ("Only one .copyright pseudo-op per file!");
ignore_rest_of_line ();
return;
}
SKIP_WHITESPACE ();
if (*input_line_pointer == '\"')
{
copyright = input_line_pointer;
++input_line_pointer;
while (is_a_char (next_char_of_string ()))
;
c = *input_line_pointer;
*input_line_pointer = '\000';
}
else
{
as_bad ("Expected quoted string");
ignore_rest_of_line ();
return;
}
copyright_seen = 1;
if (bfd_som_attach_aux_hdr (stdoutput, COPYRIGHT_AUX_ID, copyright) == false)
{
bfd_perror (stdoutput->filename);
as_perror ("FATAL: Attaching copyright header %s", stdoutput->filename);
exit (42);
}
*input_line_pointer = c;
demand_empty_rest_of_line ();
}
/* Perform any initialization necessary for stabs support.
For SOM we need to create the space which will contain the
two stabs subspaces. Additionally we need to set up the
space/subspace relationships and set space/subspace attributes
which BFD does not understand. */
void
obj_som_init_stab_section (seg)
segT seg;
{
segT saved_seg = now_seg;
segT space;
subsegT saved_subseg = now_subseg;
char *p, *file;
unsigned int stroff;
/* Make the space which will contain the debug subspaces. */
space = bfd_make_section_old_way (stdoutput, "$GDB_DEBUG$");
/* Set SOM specific attributes for the space. In particular we set
the space "defined", "private", "sort_key", and "spnum" values.
Due to a bug in pxdb (called by hpux linker), the sort keys
of the various stabs spaces/subspaces need to be "small". We
reserve range 72/73 which appear to work well. */
obj_set_section_attributes (space, 1, 1, 72, 2);
bfd_set_section_alignment (stdoutput, space, 2);
/* Set the containing space for both stab sections to be $GDB_DEBUG$
(just created above). Also set some attributes which BFD does
not understand. In particular, access bits, sort keys, and load
quadrant. */
obj_set_subsection_attributes (seg, space, 0x1f, 73, 0);
bfd_set_section_alignment (stdoutput, seg, 2);
/* Make some space for the first special stab entry and zero the memory.
It contains information about the length of this file's
stab string and the like. Using it avoids the need to
relocate the stab strings.
The $GDB_STRINGS$ space will be created as a side effect of
the call to get_stab_string_offset. */
p = frag_more (12);
memset (p, 0, 12);
as_where (&file, (unsigned int *) NULL);
stroff = get_stab_string_offset (file, "$GDB_STRINGS$");
know (stroff == 1);
md_number_to_chars (p, stroff, 4);
seg_info (seg)->stabu.p = p;
/* Set the containing space for both stab sections to be $GDB_DEBUG$
(just created above). Also set some attributes which BFD does
not understand. In particular, access bits, sort keys, and load
quadrant. */
seg = bfd_get_section_by_name (stdoutput, "$GDB_STRINGS$");
obj_set_subsection_attributes (seg, space, 0x1f, 72, 0);
bfd_set_section_alignment (stdoutput, seg, 2);
subseg_set (saved_seg, saved_subseg);
}
/* Fill in the counts in the first entry in a .stabs section. */
static void
adjust_stab_sections (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
asection *strsec;
char *p;
int strsz, nsyms;
if (strcmp ("$GDB_SYMBOLS$", sec->name))
return;
strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$");
if (strsec)
strsz = bfd_section_size (abfd, strsec);
else
strsz = 0;
nsyms = bfd_section_size (abfd, sec) / 12 - 1;
p = seg_info (sec)->stabu.p;
assert (p != 0);
bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6);
bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8);
}
#if 0
/* Adjust the VMA address for each $CODE$ subspace. */
static void
adjust_code_sections (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
static unsigned size_so_far = 0;
if (strcmp (sec->name, "$CODE$"))
return;
bfd_set_section_vma (stdoutput, sec, size_so_far);
size_so_far += bfd_get_section_size_before_reloc (sec);
}
#endif
/* Called late in the asssembly phase to adjust the special
stab entry and to set the starting address for each code subspace. */
void
som_frob_file ()
{
bfd_map_over_sections (stdoutput, adjust_stab_sections, (PTR) 0);
#if 0
See comment in tc-hppa.c:pa_proc about GDB lossage
bfd_map_over_sections (stdoutput, adjust_code_sections, (PTR) 0);
#endif
}
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