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