Subversion Repositories openrisc_2011-10-31

/* ECOFF object file format.

   Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,

   2005, 2007, 2009  Free Software Foundation, Inc.

   Contributed by Cygnus Support.

   This file was put together by Ian Lance Taylor <ian@cygnus.com>.

   This file is part of GAS.

   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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#define OBJ_HEADER "obj-ecoff.h"

#include "as.h"

#include "coff/internal.h"

#include "bfd/libcoff.h"

#include "bfd/libecoff.h"

/* Almost all of the ECOFF support is actually in ecoff.c in the main

   gas directory.  This file mostly just arranges to call that one at

   the right times.  */

/* Set section VMAs and GP values before reloc processing.  */

void

ecoff_frob_file_before_fix (void)

{

  bfd_vma addr;

  asection *sec;

  /* Set the section VMA values.  We force the .sdata and .sbss

     sections to the end to ensure that their VMA addresses are close

     together so that the GP register can address both of them.  We

     put the .bss section after the .sbss section.

     Also, for the Alpha, we must sort the sections, to make sure they

     appear in the output file in the correct order.  (Actually, maybe

     this is a job for BFD.  But the VMAs computed would be out of

     whack if we computed them given our initial, random ordering.

     It's possible that that wouldn't break things; I could do some

     experimenting sometime and find out.

     This output ordering of sections is magic, on the Alpha, at

     least.  The .lita section must come before .lit8 and .lit4,

     otherwise the OSF/1 linker may silently trash the .lit{4,8}

     section contents.  Also, .text must preceed .rdata.  These differ

     from the order described in some parts of the DEC OSF/1 Assembly

     Language Programmer's Guide, but that order doesn't seem to work

     with their linker.

     I don't know if section ordering on the MIPS is important.  */

  static const char *const names[] =

  {

    /* text segment */

    ".text", ".rdata", ".init", ".fini",

    /* data segment */

    ".data", ".lita", ".lit8", ".lit4", ".sdata", ".got",

    /* bss segment */

    ".sbss", ".bss",

  };

#define n_names ((int) (sizeof (names) / sizeof (names[0])))

  /* Sections that match names, order to be straightened out later.  */

  asection *secs[n_names];

  int i;

  addr = 0;

  for (i = 0; i < n_names; i++)

    secs[i] = NULL;

  for (sec = stdoutput->sections; sec != NULL; sec = sec->next)

    {

      for (i = 0; i < n_names; i++)

        if (!strcmp (sec->name, names[i]))

          {

            secs[i] = sec;

            bfd_section_list_remove (stdoutput, sec);

            break;

          }

      if (i == n_names)

        {

          bfd_set_section_vma (stdoutput, sec, addr);

          addr += bfd_section_size (stdoutput, sec);

        }

    }

  for (i = 0; i < n_names; i++)

    if (secs[i])

      {

        bfd_set_section_vma (stdoutput, secs[i], addr);

        addr += bfd_section_size (stdoutput, secs[i]);

      }

  for (i = n_names - 1; i >= 0; i--)

    if (secs[i])

      bfd_section_list_prepend (stdoutput, secs[i]);

  /* Fill in the register masks.  */

  {

    unsigned long gprmask = 0;

    unsigned long fprmask = 0;

    unsigned long *cprmask = NULL;

#ifdef TC_MIPS

    /* Fill in the MIPS register masks.  It's probably not worth

       setting up a generic interface for this.  */

    gprmask = mips_gprmask;

    cprmask = mips_cprmask;

#endif

#ifdef TC_ALPHA

    alpha_frob_ecoff_data ();

    if (! bfd_ecoff_set_gp_value (stdoutput, alpha_gp_value))

      as_fatal (_("Can't set GP value"));

    gprmask = alpha_gprmask;

    fprmask = alpha_fprmask;

#endif

    if (! bfd_ecoff_set_regmasks (stdoutput, gprmask, fprmask, cprmask))

      as_fatal (_("Can't set register masks"));

  }

}

/* Swap out the symbols and debugging information for BFD.  */

void

ecoff_frob_file (void)

{

  const struct ecoff_debug_swap * const debug_swap

    = &ecoff_backend (stdoutput)->debug_swap;

  bfd_vma addr ATTRIBUTE_UNUSED;

  HDRR *hdr;

  char *buf;

  char *set;

  /* Build the ECOFF debugging information.  */

  gas_assert (ecoff_data (stdoutput) != 0);

  hdr = &ecoff_data (stdoutput)->debug_info.symbolic_header;

  ecoff_build_debug (hdr, &buf, debug_swap);

  /* Finish up the ecoff_tdata structure.  */

  set = buf;

#define SET(ptr, count, type, size) \

  if (hdr->count == 0) \

    ecoff_data (stdoutput)->debug_info.ptr = NULL; \

  else \

    { \

      ecoff_data (stdoutput)->debug_info.ptr = (type) set; \

      set += hdr->count * size; \

    }

  SET (line, cbLine, unsigned char *, sizeof (unsigned char));

  SET (external_dnr, idnMax, void *, debug_swap->external_dnr_size);

  SET (external_pdr, ipdMax, void *, debug_swap->external_pdr_size);

  SET (external_sym, isymMax, void *, debug_swap->external_sym_size);

  SET (external_opt, ioptMax, void *, debug_swap->external_opt_size);

  SET (external_aux, iauxMax, union aux_ext *, sizeof (union aux_ext));

  SET (ss, issMax, char *, sizeof (char));

  SET (ssext, issExtMax, char *, sizeof (char));

  SET (external_rfd, crfd, void *, debug_swap->external_rfd_size);

  SET (external_fdr, ifdMax, void *, debug_swap->external_fdr_size);

  SET (external_ext, iextMax, void *, debug_swap->external_ext_size);

#undef SET

}

/* This is called by the ECOFF code to set the external information

   for a symbol.  We just pass it on to BFD, which expects the swapped

   information to be stored in the native field of the symbol.  */

void

obj_ecoff_set_ext (symbolS *sym, EXTR *ext)

{

  const struct ecoff_debug_swap * const debug_swap

    = &ecoff_backend (stdoutput)->debug_swap;

  ecoff_symbol_type *esym;

  know (bfd_asymbol_flavour (symbol_get_bfdsym (sym))

        == bfd_target_ecoff_flavour);

  esym = ecoffsymbol (symbol_get_bfdsym (sym));

  esym->local = FALSE;

  esym->native = xmalloc (debug_swap->external_ext_size);

  (*debug_swap->swap_ext_out) (stdoutput, ext, esym->native);

}

static int

ecoff_sec_sym_ok_for_reloc (asection *sec ATTRIBUTE_UNUSED)

{

  return 1;

}

static void

obj_ecoff_frob_symbol (symbolS *sym, int *puntp ATTRIBUTE_UNUSED)

{

  ecoff_frob_symbol (sym);

}

static void

ecoff_pop_insert (void)

{

  pop_insert (obj_pseudo_table);

}

static int

ecoff_separate_stab_sections (void)

{

  return 0;

}

/* These are the pseudo-ops we support in this file.  Only those

   relating to debugging information are supported here.

   The following pseudo-ops from the Kane and Heinrich MIPS book

   should be defined here, but are currently unsupported: .aent,

   .bgnb, .endb, .verstamp, .vreg.

   The following pseudo-ops from the Kane and Heinrich MIPS book are

   MIPS CPU specific, and should be defined by tc-mips.c: .alias,

   .extern, .galive, .gjaldef, .gjrlive, .livereg, .noalias, .option,

   .rdata, .sdata, .set.

   The following pseudo-ops from the Kane and Heinrich MIPS book are

   not MIPS CPU specific, but are also not ECOFF specific.  I have

   only listed the ones which are not already in read.c.  It's not

   completely clear where these should be defined, but tc-mips.c is

   probably the most reasonable place: .asciiz, .asm0, .endr, .err,

   .half, .lab, .repeat, .struct, .weakext.  */

const pseudo_typeS obj_pseudo_table[] =

{

  /* COFF style debugging information. .ln is not used; .loc is used

     instead.  */

  { "def",      ecoff_directive_def,    0 },

  { "dim",      ecoff_directive_dim,    0 },

  { "endef",    ecoff_directive_endef,  0 },

  { "file",     ecoff_directive_file,   0 },

  { "scl",      ecoff_directive_scl,    0 },

  { "size",     ecoff_directive_size,   0 },

  { "esize",    ecoff_directive_size,   0 },

  { "tag",      ecoff_directive_tag,    0 },

  { "type",     ecoff_directive_type,   0 },

  { "etype",    ecoff_directive_type,   0 },

  { "val",      ecoff_directive_val,    0 },

  /* ECOFF specific debugging information.  */

  { "begin",    ecoff_directive_begin,  0 },

  { "bend",     ecoff_directive_bend,   0 },

  { "end",      ecoff_directive_end,    0 },

  { "ent",      ecoff_directive_ent,    0 },

  { "fmask",    ecoff_directive_fmask,  0 },

  { "frame",    ecoff_directive_frame,  0 },

  { "loc",      ecoff_directive_loc,    0 },

  { "mask",     ecoff_directive_mask,   0 },

  /* Other ECOFF directives.  */

  { "extern",   ecoff_directive_extern, 0 },

#ifndef TC_MIPS

  /* For TC_MIPS, tc-mips.c adds this.  */

  { "weakext",  ecoff_directive_weakext, 0 },

#endif

  /* These are used on Irix.  I don't know how to implement them.  */

  { "bgnb",     s_ignore,               0 },

  { "endb",     s_ignore,               0 },

  { "verstamp", s_ignore,               0 },

  /* Sentinel.  */

  { NULL,       s_ignore,               0 }

};

const struct format_ops ecoff_format_ops =

{

  bfd_target_ecoff_flavour,

  0,     /* dfl_leading_underscore.  */

  /* FIXME: A comment why emit_section_symbols is different here (1) from

     the single-format definition (0) would be in order.  */

  1,    /* emit_section_symbols.  */

  0,     /* begin.  */

  ecoff_new_file,

  obj_ecoff_frob_symbol,

  ecoff_frob_file,

  0,     /* frob_file_before_adjust.  */

  ecoff_frob_file_before_fix,

  0,     /* frob_file_after_relocs.  */

  0,     /* s_get_size.  */

  0,     /* s_set_size.  */

  0,     /* s_get_align.  */

  0,     /* s_set_align.  */

  0,     /* s_get_other.  */

  0,     /* s_set_other.  */

  0,     /* s_get_desc.  */

  0,     /* s_set_desc.  */

  0,     /* s_get_type.  */

  0,     /* s_set_type.  */

  0,     /* copy_symbol_attributes.  */

  ecoff_generate_asm_lineno,

  ecoff_stab,

  ecoff_separate_stab_sections,

  0,     /* init_stab_section.  */

  ecoff_sec_sym_ok_for_reloc,

  ecoff_pop_insert,

  ecoff_set_ext,

  ecoff_read_begin_hook,

  ecoff_symbol_new_hook

};