gas/config/obj-ecoff.c

   1 /* ECOFF object file format.
   2    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4    Contributed by Cygnus Support.
   5    This file was put together by Ian Lance Taylor <ian@cygnus.com>.
   6
   7    This file is part of GAS.
   8
   9    GAS is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  22    02111-1307, USA.  */
  23
  24 #define OBJ_HEADER "obj-ecoff.h"
  25 #include "as.h"
  26 #include "coff/internal.h"
  27 #include "bfd/libcoff.h"
  28 #include "bfd/libecoff.h"
  29
  30 /* Almost all of the ECOFF support is actually in ecoff.c in the main
  31    gas directory.  This file mostly just arranges to call that one at
  32    the right times.  */
  33
  34 static int ecoff_sec_sym_ok_for_reloc PARAMS ((asection *));
  35 static void obj_ecoff_frob_symbol PARAMS ((symbolS *, int *));
  36 static void ecoff_pop_insert PARAMS ((void));
  37 static int ecoff_separate_stab_sections PARAMS ((void));
  38
  39 /* These are the pseudo-ops we support in this file.  Only those
  40    relating to debugging information are supported here.
  41
  42    The following pseudo-ops from the Kane and Heinrich MIPS book
  43    should be defined here, but are currently unsupported: .aent,
  44    .bgnb, .endb, .verstamp, .vreg.
  45
  46    The following pseudo-ops from the Kane and Heinrich MIPS book are
  47    MIPS CPU specific, and should be defined by tc-mips.c: .alias,
  48    .extern, .galive, .gjaldef, .gjrlive, .livereg, .noalias, .option,
  49    .rdata, .sdata, .set.
  50
  51    The following pseudo-ops from the Kane and Heinrich MIPS book are
  52    not MIPS CPU specific, but are also not ECOFF specific.  I have
  53    only listed the ones which are not already in read.c.  It's not
  54    completely clear where these should be defined, but tc-mips.c is
  55    probably the most reasonable place: .asciiz, .asm0, .endr, .err,
  56    .half, .lab, .repeat, .struct, .weakext.  */
  57
  58 const pseudo_typeS obj_pseudo_table[] =
  59 {
  60   /* COFF style debugging information. .ln is not used; .loc is used
  61      instead.  */
  62   { "def",      ecoff_directive_def,    0 },
  63   { "dim",      ecoff_directive_dim,    0 },
  64   { "endef",    ecoff_directive_endef,  0 },
  65   { "file",     ecoff_directive_file,   0 },
  66   { "scl",      ecoff_directive_scl,    0 },
  67   { "size",     ecoff_directive_size,   0 },
  68   { "esize",    ecoff_directive_size,   0 },
  69   { "tag",      ecoff_directive_tag,    0 },
  70   { "type",     ecoff_directive_type,   0 },
  71   { "etype",    ecoff_directive_type,   0 },
  72   { "val",      ecoff_directive_val,    0 },
  73
  74   /* ECOFF specific debugging information.  */
  75   { "begin",    ecoff_directive_begin,  0 },
  76   { "bend",     ecoff_directive_bend,   0 },
  77   { "end",      ecoff_directive_end,    0 },
  78   { "ent",      ecoff_directive_ent,    0 },
  79   { "fmask",    ecoff_directive_fmask,  0 },
  80   { "frame",    ecoff_directive_frame,  0 },
  81   { "loc",      ecoff_directive_loc,    0 },
  82   { "mask",     ecoff_directive_mask,   0 },
  83
  84   /* Other ECOFF directives.  */
  85   { "extern",   ecoff_directive_extern, 0 },
  86
  87 #ifndef TC_MIPS
  88   /* For TC_MIPS, tc-mips.c adds this.  */
  89   { "weakext",  ecoff_directive_weakext, 0 },
  90 #endif
  91
  92   /* These are used on Irix.  I don't know how to implement them.  */
  93   { "bgnb",     s_ignore,               0 },
  94   { "endb",     s_ignore,               0 },
  95   { "verstamp", s_ignore,               0 },
  96
  97   /* Sentinel.  */
  98   { NULL,       s_ignore,               0 }
  99 };
 100
 101 /* Set section VMAs and GP values before reloc processing.  */
 102
 103 void
 104 ecoff_frob_file_before_fix ()
 105 {
 106   bfd_vma addr;
 107   asection **sec;
 108
 109   /* Set the section VMA values.  We force the .sdata and .sbss
 110      sections to the end to ensure that their VMA addresses are close
 111      together so that the GP register can address both of them.  We
 112      put the .bss section after the .sbss section.
 113
 114      Also, for the Alpha, we must sort the sections, to make sure they
 115      appear in the output file in the correct order.  (Actually, maybe
 116      this is a job for BFD.  But the VMAs computed would be out of
 117      whack if we computed them given our initial, random ordering.
 118      It's possible that that wouldn't break things; I could do some
 119      experimenting sometime and find out.
 120
 121      This output ordering of sections is magic, on the Alpha, at
 122      least.  The .lita section must come before .lit8 and .lit4,
 123      otherwise the OSF/1 linker may silently trash the .lit{4,8}
 124      section contents.  Also, .text must preceed .rdata.  These differ
 125      from the order described in some parts of the DEC OSF/1 Assembly
 126      Language Programmer's Guide, but that order doesn't seem to work
 127      with their linker.
 128
 129      I don't know if section ordering on the MIPS is important.  */
 130
 131   static const char *const names[] = {
 132     /* text segment */
 133     ".text", ".rdata", ".init", ".fini",
 134     /* data segment */
 135     ".data", ".lita", ".lit8", ".lit4", ".sdata", ".got",
 136     /* bss segment */
 137     ".sbss", ".bss",
 138   };
 139 #define n_names ((int) (sizeof (names) / sizeof (names[0])))
 140
 141   /* Sections that match names, order to be straightened out later.  */
 142   asection *secs[n_names];
 143   int i;
 144
 145   addr = 0;
 146   for (i = 0; i < n_names; i++)
 147     secs[i] = 0;
 148
 149   for (sec = &stdoutput->sections; *sec != (asection *) NULL; )
 150     {
 151       for (i = 0; i < n_names; i++)
 152         if (!strcmp ((*sec)->name, names[i]))
 153           {
 154             secs[i] = *sec;
 155             bfd_section_list_remove (stdoutput, sec);
 156             break;
 157           }
 158       if (i == n_names)
 159         {
 160           bfd_set_section_vma (stdoutput, *sec, addr);
 161           addr += bfd_section_size (stdoutput, *sec);
 162           sec = &(*sec)->next;
 163         }
 164     }
 165   for (i = 0; i < n_names; i++)
 166     if (secs[i])
 167       {
 168         bfd_set_section_vma (stdoutput, secs[i], addr);
 169         addr += bfd_section_size (stdoutput, secs[i]);
 170       }
 171   for (i = n_names - 1; i >= 0; i--)
 172     if (secs[i])
 173       bfd_section_list_insert (stdoutput, &stdoutput->sections, secs[i]);
 174
 175   /* Fill in the register masks.  */
 176   {
 177     unsigned long gprmask = 0;
 178     unsigned long fprmask = 0;
 179     unsigned long *cprmask = NULL;
 180
 181 #ifdef TC_MIPS
 182     /* Fill in the MIPS register masks.  It's probably not worth
 183        setting up a generic interface for this.  */
 184     gprmask = mips_gprmask;
 185     cprmask = mips_cprmask;
 186 #endif
 187
 188 #ifdef TC_ALPHA
 189     alpha_frob_ecoff_data ();
 190
 191     if (! bfd_ecoff_set_gp_value (stdoutput, alpha_gp_value))
 192       as_fatal (_("Can't set GP value"));
 193
 194     gprmask = alpha_gprmask;
 195     fprmask = alpha_fprmask;
 196 #endif
 197
 198     if (! bfd_ecoff_set_regmasks (stdoutput, gprmask, fprmask, cprmask))
 199       as_fatal (_("Can't set register masks"));
 200   }
 201 }
 202
 203 /* Swap out the symbols and debugging information for BFD.  */
 204
 205 void
 206 ecoff_frob_file ()
 207 {
 208   const struct ecoff_debug_swap * const debug_swap
 209     = &ecoff_backend (stdoutput)->debug_swap;
 210   bfd_vma addr ATTRIBUTE_UNUSED;
 211   HDRR *hdr;
 212   char *buf;
 213   char *set;
 214
 215   /* Build the ECOFF debugging information.  */
 216   assert (ecoff_data (stdoutput) != 0);
 217   hdr = &ecoff_data (stdoutput)->debug_info.symbolic_header;
 218   ecoff_build_debug (hdr, &buf, debug_swap);
 219
 220   /* Finish up the ecoff_tdata structure.  */
 221   set = buf;
 222 #define SET(ptr, count, type, size) \
 223   if (hdr->count == 0) \
 224     ecoff_data (stdoutput)->debug_info.ptr = (type) NULL; \
 225   else \
 226     { \
 227       ecoff_data (stdoutput)->debug_info.ptr = (type) set; \
 228       set += hdr->count * size; \
 229     }
 230
 231   SET (line, cbLine, unsigned char *, sizeof (unsigned char));
 232   SET (external_dnr, idnMax, PTR, debug_swap->external_dnr_size);
 233   SET (external_pdr, ipdMax, PTR, debug_swap->external_pdr_size);
 234   SET (external_sym, isymMax, PTR, debug_swap->external_sym_size);
 235   SET (external_opt, ioptMax, PTR, debug_swap->external_opt_size);
 236   SET (external_aux, iauxMax, union aux_ext *, sizeof (union aux_ext));
 237   SET (ss, issMax, char *, sizeof (char));
 238   SET (ssext, issExtMax, char *, sizeof (char));
 239   SET (external_rfd, crfd, PTR, debug_swap->external_rfd_size);
 240   SET (external_fdr, ifdMax, PTR, debug_swap->external_fdr_size);
 241   SET (external_ext, iextMax, PTR, debug_swap->external_ext_size);
 242 #undef SET
 243 }
 244
 245 /* This is called by the ECOFF code to set the external information
 246    for a symbol.  We just pass it on to BFD, which expects the swapped
 247    information to be stored in the native field of the symbol.  */
 248
 249 void
 250 obj_ecoff_set_ext (sym, ext)
 251      symbolS *sym;
 252      EXTR *ext;
 253 {
 254   const struct ecoff_debug_swap * const debug_swap
 255     = &ecoff_backend (stdoutput)->debug_swap;
 256   ecoff_symbol_type *esym;
 257
 258   know (bfd_asymbol_flavour (symbol_get_bfdsym (sym))
 259         == bfd_target_ecoff_flavour);
 260   esym = ecoffsymbol (symbol_get_bfdsym (sym));
 261   esym->local = FALSE;
 262   esym->native = xmalloc (debug_swap->external_ext_size);
 263   (*debug_swap->swap_ext_out) (stdoutput, ext, esym->native);
 264 }
 265
 266 static int
 267 ecoff_sec_sym_ok_for_reloc (sec)
 268      asection *sec ATTRIBUTE_UNUSED;
 269 {
 270   return 1;
 271 }
 272
 273 static void
 274 obj_ecoff_frob_symbol (sym, puntp)
 275      symbolS *sym;
 276      int *puntp ATTRIBUTE_UNUSED;
 277 {
 278   ecoff_frob_symbol (sym);
 279 }
 280
 281 static void
 282 ecoff_pop_insert ()
 283 {
 284   pop_insert (obj_pseudo_table);
 285 }
 286
 287 static int
 288 ecoff_separate_stab_sections ()
 289 {
 290   return 0;
 291 }
 292
 293 const struct format_ops ecoff_format_ops =
 294 {
 295   bfd_target_ecoff_flavour,
 296   0,    /* dfl_leading_underscore */
 297
 298   /* FIXME: A comment why emit_section_symbols is different here (1) from
 299      the single-format definition (0) would be in order.  */
 300   1,    /* emit_section_symbols */
 301   0,    /* begin */
 302   ecoff_new_file,
 303   obj_ecoff_frob_symbol,
 304   ecoff_frob_file,
 305   0,    /* frob_file_before_adjust */
 306   ecoff_frob_file_before_fix,
 307   0,    /* frob_file_after_relocs */
 308   0,    /* s_get_size */
 309   0,    /* s_set_size */
 310   0,    /* s_get_align */
 311   0,    /* s_set_align */
 312   0,    /* s_get_other */
 313   0,    /* s_set_other */
 314   0,    /* s_get_desc */
 315   0,    /* s_set_desc */
 316   0,    /* s_get_type */
 317   0,    /* s_set_type */
 318   0,    /* copy_symbol_attributes */
 319   ecoff_generate_asm_lineno,
 320   ecoff_stab,
 321   ecoff_separate_stab_sections,
 322   0,    /* init_stab_section */
 323   ecoff_sec_sym_ok_for_reloc,
 324   ecoff_pop_insert,
 325   ecoff_set_ext,
 326   ecoff_read_begin_hook,
 327   ecoff_symbol_new_hook
 328 };