gas/config/obj-ecoff.c

   1 /* ECOFF object file format.
   2    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
   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 /* Swap out the symbols and debugging information for BFD.  */
 102
 103 void
 104 ecoff_frob_file ()
 105 {
 106   const struct ecoff_debug_swap * const debug_swap
 107     = &ecoff_backend (stdoutput)->debug_swap;
 108   bfd_vma addr;
 109   asection **sec;
 110   HDRR *hdr;
 111   char *buf;
 112   char *set;
 113
 114   /* Set the section VMA values.  We force the .sdata and .sbss
 115      sections to the end to ensure that their VMA addresses are close
 116      together so that the GP register can address both of them.  We
 117      put the .bss section after the .sbss section.
 118
 119      Also, for the Alpha, we must sort the sections, to make sure they
 120      appear in the output file in the correct order.  (Actually, maybe
 121      this is a job for BFD.  But the VMAs computed would be out of
 122      whack if we computed them given our initial, random ordering.
 123      It's possible that that wouldn't break things; I could do some
 124      experimenting sometime and find out.
 125
 126      This output ordering of sections is magic, on the Alpha, at
 127      least.  The .lita section must come before .lit8 and .lit4,
 128      otherwise the OSF/1 linker may silently trash the .lit{4,8}
 129      section contents.  Also, .text must preceed .rdata.  These differ
 130      from the order described in some parts of the DEC OSF/1 Assembly
 131      Language Programmer's Guide, but that order doesn't seem to work
 132      with their linker.
 133
 134      I don't know if section ordering on the MIPS is important.  */
 135
 136   static const char *const names[] = {
 137     /* text segment */
 138     ".text", ".rdata", ".init", ".fini",
 139     /* data segment */
 140     ".data", ".lita", ".lit8", ".lit4", ".sdata", ".got",
 141     /* bss segment */
 142     ".sbss", ".bss",
 143   };
 144 #define n_names ((int) (sizeof (names) / sizeof (names[0])))
 145
 146   /* Sections that match names, order to be straightened out later.  */
 147   asection *secs[n_names];
 148   int i;
 149
 150   addr = 0;
 151   for (i = 0; i < n_names; i++)
 152     secs[i] = 0;
 153
 154   for (sec = &stdoutput->sections; *sec != (asection *) NULL; )
 155     {
 156       for (i = 0; i < n_names; i++)
 157         if (!strcmp ((*sec)->name, names[i]))
 158           {
 159             secs[i] = *sec;
 160             bfd_section_list_remove (stdoutput, sec);
 161             break;
 162           }
 163       if (i == n_names)
 164         {
 165           bfd_set_section_vma (stdoutput, *sec, addr);
 166           addr += bfd_section_size (stdoutput, *sec);
 167           sec = &(*sec)->next;
 168         }
 169     }
 170   for (i = 0; i < n_names; i++)
 171     if (secs[i])
 172       {
 173         bfd_set_section_vma (stdoutput, secs[i], addr);
 174         addr += bfd_section_size (stdoutput, secs[i]);
 175       }
 176   for (i = n_names - 1; i >= 0; i--)
 177     if (secs[i])
 178       bfd_section_list_insert (stdoutput, &stdoutput->sections, secs[i]);
 179
 180   /* Build the ECOFF debugging information.  */
 181   assert (ecoff_data (stdoutput) != 0);
 182   hdr = &ecoff_data (stdoutput)->debug_info.symbolic_header;
 183   ecoff_build_debug (hdr, &buf, debug_swap);
 184
 185   /* Finish up the ecoff_tdata structure.  */
 186   set = buf;
 187 #define SET(ptr, count, type, size) \
 188   if (hdr->count == 0) \
 189     ecoff_data (stdoutput)->debug_info.ptr = (type) NULL; \
 190   else \
 191     { \
 192       ecoff_data (stdoutput)->debug_info.ptr = (type) set; \
 193       set += hdr->count * size; \
 194     }
 195
 196   SET (line, cbLine, unsigned char *, sizeof (unsigned char));
 197   SET (external_dnr, idnMax, PTR, debug_swap->external_dnr_size);
 198   SET (external_pdr, ipdMax, PTR, debug_swap->external_pdr_size);
 199   SET (external_sym, isymMax, PTR, debug_swap->external_sym_size);
 200   SET (external_opt, ioptMax, PTR, debug_swap->external_opt_size);
 201   SET (external_aux, iauxMax, union aux_ext *, sizeof (union aux_ext));
 202   SET (ss, issMax, char *, sizeof (char));
 203   SET (ssext, issExtMax, char *, sizeof (char));
 204   SET (external_rfd, crfd, PTR, debug_swap->external_rfd_size);
 205   SET (external_fdr, ifdMax, PTR, debug_swap->external_fdr_size);
 206   SET (external_ext, iextMax, PTR, debug_swap->external_ext_size);
 207
 208 #undef SET
 209
 210   /* Fill in the register masks.  */
 211   {
 212     unsigned long gprmask = 0;
 213     unsigned long fprmask = 0;
 214     unsigned long *cprmask = NULL;
 215
 216 #ifdef TC_MIPS
 217     /* Fill in the MIPS register masks.  It's probably not worth
 218        setting up a generic interface for this.  */
 219     gprmask = mips_gprmask;
 220     cprmask = mips_cprmask;
 221 #endif
 222
 223 #ifdef TC_ALPHA
 224     alpha_frob_ecoff_data ();
 225
 226     if (! bfd_ecoff_set_gp_value (stdoutput, alpha_gp_value))
 227       as_fatal (_("Can't set GP value"));
 228
 229     gprmask = alpha_gprmask;
 230     fprmask = alpha_fprmask;
 231 #endif
 232
 233     if (! bfd_ecoff_set_regmasks (stdoutput, gprmask, fprmask, cprmask))
 234       as_fatal (_("Can't set register masks"));
 235   }
 236 }
 237
 238 /* This is called by the ECOFF code to set the external information
 239    for a symbol.  We just pass it on to BFD, which expects the swapped
 240    information to be stored in the native field of the symbol.  */
 241
 242 void
 243 obj_ecoff_set_ext (sym, ext)
 244      symbolS *sym;
 245      EXTR *ext;
 246 {
 247   const struct ecoff_debug_swap * const debug_swap
 248     = &ecoff_backend (stdoutput)->debug_swap;
 249   ecoff_symbol_type *esym;
 250
 251   know (bfd_asymbol_flavour (symbol_get_bfdsym (sym))
 252         == bfd_target_ecoff_flavour);
 253   esym = ecoffsymbol (symbol_get_bfdsym (sym));
 254   esym->local = false;
 255   esym->native = xmalloc (debug_swap->external_ext_size);
 256   (*debug_swap->swap_ext_out) (stdoutput, ext, esym->native);
 257 }
 258
 259 static int
 260 ecoff_sec_sym_ok_for_reloc (sec)
 261      asection *sec ATTRIBUTE_UNUSED;
 262 {
 263   return 1;
 264 }
 265
 266 static void
 267 obj_ecoff_frob_symbol (sym, puntp)
 268      symbolS *sym;
 269      int *puntp ATTRIBUTE_UNUSED;
 270 {
 271   ecoff_frob_symbol (sym);
 272 }
 273
 274 static void
 275 ecoff_pop_insert ()
 276 {
 277   pop_insert (obj_pseudo_table);
 278 }
 279
 280 static int
 281 ecoff_separate_stab_sections ()
 282 {
 283   return 0;
 284 }
 285
 286 const struct format_ops ecoff_format_ops =
 287 {
 288   bfd_target_ecoff_flavour,
 289   0,    /* dfl_leading_underscore */
 290
 291   /* FIXME: A comment why emit_section_symbols is different here (1) from
 292      the single-format definition (0) would be in order.  */
 293   1,    /* emit_section_symbols */
 294   0,    /* begin */
 295   ecoff_new_file,
 296   obj_ecoff_frob_symbol,
 297   ecoff_frob_file,
 298   0,    /* frob_file_before_adjust */
 299   0,    /* frob_file_after_relocs */
 300   0,    /* s_get_size */
 301   0,    /* s_set_size */
 302   0,    /* s_get_align */
 303   0,    /* s_set_align */
 304   0,    /* s_get_other */
 305   0,    /* s_set_other */
 306   0,    /* s_get_desc */
 307   0,    /* s_set_desc */
 308   0,    /* s_get_type */
 309   0,    /* s_set_type */
 310   0,    /* copy_symbol_attributes */
 311   ecoff_generate_asm_lineno,
 312   ecoff_stab,
 313   ecoff_separate_stab_sections,
 314   0,    /* init_stab_section */
 315   ecoff_sec_sym_ok_for_reloc,
 316   ecoff_pop_insert,
 317   ecoff_set_ext,
 318   ecoff_read_begin_hook,
 319   ecoff_symbol_new_hook
 320 };