329 lines
10 KiB
C
329 lines
10 KiB
C
/* ECOFF object file format.
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Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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This file was put together by Ian Lance Taylor <ian@cygnus.com>.
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This file is part of GAS.
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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 published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#define OBJ_HEADER "obj-ecoff.h"
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#include "as.h"
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#include "coff/internal.h"
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#include "bfd/libcoff.h"
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#include "bfd/libecoff.h"
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/* Almost all of the ECOFF support is actually in ecoff.c in the main
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gas directory. This file mostly just arranges to call that one at
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the right times. */
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static int ecoff_sec_sym_ok_for_reloc PARAMS ((asection *));
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static void obj_ecoff_frob_symbol PARAMS ((symbolS *, int *));
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static void ecoff_pop_insert PARAMS ((void));
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static int ecoff_separate_stab_sections PARAMS ((void));
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/* These are the pseudo-ops we support in this file. Only those
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relating to debugging information are supported here.
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The following pseudo-ops from the Kane and Heinrich MIPS book
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should be defined here, but are currently unsupported: .aent,
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.bgnb, .endb, .verstamp, .vreg.
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The following pseudo-ops from the Kane and Heinrich MIPS book are
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MIPS CPU specific, and should be defined by tc-mips.c: .alias,
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.extern, .galive, .gjaldef, .gjrlive, .livereg, .noalias, .option,
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.rdata, .sdata, .set.
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The following pseudo-ops from the Kane and Heinrich MIPS book are
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not MIPS CPU specific, but are also not ECOFF specific. I have
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only listed the ones which are not already in read.c. It's not
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completely clear where these should be defined, but tc-mips.c is
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probably the most reasonable place: .asciiz, .asm0, .endr, .err,
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.half, .lab, .repeat, .struct, .weakext. */
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const pseudo_typeS obj_pseudo_table[] =
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{
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/* COFF style debugging information. .ln is not used; .loc is used
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instead. */
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{ "def", ecoff_directive_def, 0 },
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{ "dim", ecoff_directive_dim, 0 },
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{ "endef", ecoff_directive_endef, 0 },
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{ "file", ecoff_directive_file, 0 },
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{ "scl", ecoff_directive_scl, 0 },
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{ "size", ecoff_directive_size, 0 },
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{ "esize", ecoff_directive_size, 0 },
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{ "tag", ecoff_directive_tag, 0 },
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{ "type", ecoff_directive_type, 0 },
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{ "etype", ecoff_directive_type, 0 },
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{ "val", ecoff_directive_val, 0 },
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/* ECOFF specific debugging information. */
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{ "begin", ecoff_directive_begin, 0 },
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{ "bend", ecoff_directive_bend, 0 },
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{ "end", ecoff_directive_end, 0 },
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{ "ent", ecoff_directive_ent, 0 },
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{ "fmask", ecoff_directive_fmask, 0 },
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{ "frame", ecoff_directive_frame, 0 },
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{ "loc", ecoff_directive_loc, 0 },
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{ "mask", ecoff_directive_mask, 0 },
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/* Other ECOFF directives. */
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{ "extern", ecoff_directive_extern, 0 },
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#ifndef TC_MIPS
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/* For TC_MIPS, tc-mips.c adds this. */
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{ "weakext", ecoff_directive_weakext, 0 },
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#endif
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/* These are used on Irix. I don't know how to implement them. */
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{ "bgnb", s_ignore, 0 },
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{ "endb", s_ignore, 0 },
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{ "verstamp", s_ignore, 0 },
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/* Sentinel. */
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{ NULL, s_ignore, 0 }
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};
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/* Set section VMAs and GP values before reloc processing. */
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void
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ecoff_frob_file_before_fix ()
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{
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bfd_vma addr;
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asection **sec;
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/* Set the section VMA values. We force the .sdata and .sbss
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sections to the end to ensure that their VMA addresses are close
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together so that the GP register can address both of them. We
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put the .bss section after the .sbss section.
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Also, for the Alpha, we must sort the sections, to make sure they
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appear in the output file in the correct order. (Actually, maybe
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this is a job for BFD. But the VMAs computed would be out of
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whack if we computed them given our initial, random ordering.
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It's possible that that wouldn't break things; I could do some
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experimenting sometime and find out.
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This output ordering of sections is magic, on the Alpha, at
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least. The .lita section must come before .lit8 and .lit4,
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otherwise the OSF/1 linker may silently trash the .lit{4,8}
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section contents. Also, .text must preceed .rdata. These differ
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from the order described in some parts of the DEC OSF/1 Assembly
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Language Programmer's Guide, but that order doesn't seem to work
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with their linker.
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I don't know if section ordering on the MIPS is important. */
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static const char *const names[] = {
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/* text segment */
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".text", ".rdata", ".init", ".fini",
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/* data segment */
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".data", ".lita", ".lit8", ".lit4", ".sdata", ".got",
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/* bss segment */
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".sbss", ".bss",
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};
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#define n_names ((int) (sizeof (names) / sizeof (names[0])))
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/* Sections that match names, order to be straightened out later. */
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asection *secs[n_names];
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int i;
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addr = 0;
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for (i = 0; i < n_names; i++)
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secs[i] = 0;
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for (sec = &stdoutput->sections; *sec != (asection *) NULL; )
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{
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for (i = 0; i < n_names; i++)
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if (!strcmp ((*sec)->name, names[i]))
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{
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secs[i] = *sec;
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bfd_section_list_remove (stdoutput, sec);
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break;
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}
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if (i == n_names)
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{
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bfd_set_section_vma (stdoutput, *sec, addr);
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addr += bfd_section_size (stdoutput, *sec);
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sec = &(*sec)->next;
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}
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}
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for (i = 0; i < n_names; i++)
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if (secs[i])
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{
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bfd_set_section_vma (stdoutput, secs[i], addr);
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addr += bfd_section_size (stdoutput, secs[i]);
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}
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for (i = n_names - 1; i >= 0; i--)
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if (secs[i])
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bfd_section_list_insert (stdoutput, &stdoutput->sections, secs[i]);
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/* Fill in the register masks. */
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{
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unsigned long gprmask = 0;
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unsigned long fprmask = 0;
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unsigned long *cprmask = NULL;
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#ifdef TC_MIPS
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/* Fill in the MIPS register masks. It's probably not worth
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setting up a generic interface for this. */
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gprmask = mips_gprmask;
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cprmask = mips_cprmask;
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#endif
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#ifdef TC_ALPHA
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alpha_frob_ecoff_data ();
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if (! bfd_ecoff_set_gp_value (stdoutput, alpha_gp_value))
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as_fatal (_("Can't set GP value"));
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gprmask = alpha_gprmask;
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fprmask = alpha_fprmask;
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#endif
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if (! bfd_ecoff_set_regmasks (stdoutput, gprmask, fprmask, cprmask))
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as_fatal (_("Can't set register masks"));
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}
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}
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/* Swap out the symbols and debugging information for BFD. */
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void
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ecoff_frob_file ()
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{
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const struct ecoff_debug_swap * const debug_swap
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= &ecoff_backend (stdoutput)->debug_swap;
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bfd_vma addr ATTRIBUTE_UNUSED;
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HDRR *hdr;
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char *buf;
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char *set;
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/* Build the ECOFF debugging information. */
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assert (ecoff_data (stdoutput) != 0);
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hdr = &ecoff_data (stdoutput)->debug_info.symbolic_header;
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ecoff_build_debug (hdr, &buf, debug_swap);
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/* Finish up the ecoff_tdata structure. */
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set = buf;
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#define SET(ptr, count, type, size) \
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if (hdr->count == 0) \
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ecoff_data (stdoutput)->debug_info.ptr = (type) NULL; \
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else \
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{ \
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ecoff_data (stdoutput)->debug_info.ptr = (type) set; \
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set += hdr->count * size; \
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}
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SET (line, cbLine, unsigned char *, sizeof (unsigned char));
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SET (external_dnr, idnMax, PTR, debug_swap->external_dnr_size);
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SET (external_pdr, ipdMax, PTR, debug_swap->external_pdr_size);
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SET (external_sym, isymMax, PTR, debug_swap->external_sym_size);
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SET (external_opt, ioptMax, PTR, debug_swap->external_opt_size);
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SET (external_aux, iauxMax, union aux_ext *, sizeof (union aux_ext));
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SET (ss, issMax, char *, sizeof (char));
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SET (ssext, issExtMax, char *, sizeof (char));
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SET (external_rfd, crfd, PTR, debug_swap->external_rfd_size);
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SET (external_fdr, ifdMax, PTR, debug_swap->external_fdr_size);
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SET (external_ext, iextMax, PTR, debug_swap->external_ext_size);
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#undef SET
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}
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/* This is called by the ECOFF code to set the external information
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for a symbol. We just pass it on to BFD, which expects the swapped
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information to be stored in the native field of the symbol. */
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void
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obj_ecoff_set_ext (sym, ext)
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symbolS *sym;
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EXTR *ext;
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{
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const struct ecoff_debug_swap * const debug_swap
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= &ecoff_backend (stdoutput)->debug_swap;
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ecoff_symbol_type *esym;
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know (bfd_asymbol_flavour (symbol_get_bfdsym (sym))
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== bfd_target_ecoff_flavour);
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esym = ecoffsymbol (symbol_get_bfdsym (sym));
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esym->local = FALSE;
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esym->native = xmalloc (debug_swap->external_ext_size);
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(*debug_swap->swap_ext_out) (stdoutput, ext, esym->native);
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}
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static int
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ecoff_sec_sym_ok_for_reloc (sec)
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asection *sec ATTRIBUTE_UNUSED;
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{
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return 1;
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}
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static void
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obj_ecoff_frob_symbol (sym, puntp)
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symbolS *sym;
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int *puntp ATTRIBUTE_UNUSED;
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{
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ecoff_frob_symbol (sym);
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}
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static void
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ecoff_pop_insert ()
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{
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pop_insert (obj_pseudo_table);
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}
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static int
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ecoff_separate_stab_sections ()
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{
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return 0;
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}
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const struct format_ops ecoff_format_ops =
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{
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bfd_target_ecoff_flavour,
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0, /* dfl_leading_underscore */
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/* FIXME: A comment why emit_section_symbols is different here (1) from
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the single-format definition (0) would be in order. */
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1, /* emit_section_symbols */
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0, /* begin */
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ecoff_new_file,
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obj_ecoff_frob_symbol,
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ecoff_frob_file,
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0, /* frob_file_before_adjust */
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ecoff_frob_file_before_fix,
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0, /* frob_file_after_relocs */
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0, /* s_get_size */
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0, /* s_set_size */
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0, /* s_get_align */
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0, /* s_set_align */
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0, /* s_get_other */
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0, /* s_set_other */
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0, /* s_get_desc */
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0, /* s_set_desc */
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0, /* s_get_type */
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0, /* s_set_type */
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0, /* copy_symbol_attributes */
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ecoff_generate_asm_lineno,
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ecoff_stab,
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ecoff_separate_stab_sections,
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0, /* init_stab_section */
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ecoff_sec_sym_ok_for_reloc,
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ecoff_pop_insert,
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ecoff_set_ext,
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ecoff_read_begin_hook,
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ecoff_symbol_new_hook
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};
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