| 1 | /* ECOFF object file format. |
| 2 | Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, |
| 3 | 2005 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, 51 Franklin Street - Fifth Floor, Boston, MA |
| 22 | 02110-1301, 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 | /* Set section VMAs and GP values before reloc processing. */ |
| 35 | |
| 36 | void |
| 37 | ecoff_frob_file_before_fix (void) |
| 38 | { |
| 39 | bfd_vma addr; |
| 40 | asection *sec; |
| 41 | |
| 42 | /* Set the section VMA values. We force the .sdata and .sbss |
| 43 | sections to the end to ensure that their VMA addresses are close |
| 44 | together so that the GP register can address both of them. We |
| 45 | put the .bss section after the .sbss section. |
| 46 | |
| 47 | Also, for the Alpha, we must sort the sections, to make sure they |
| 48 | appear in the output file in the correct order. (Actually, maybe |
| 49 | this is a job for BFD. But the VMAs computed would be out of |
| 50 | whack if we computed them given our initial, random ordering. |
| 51 | It's possible that that wouldn't break things; I could do some |
| 52 | experimenting sometime and find out. |
| 53 | |
| 54 | This output ordering of sections is magic, on the Alpha, at |
| 55 | least. The .lita section must come before .lit8 and .lit4, |
| 56 | otherwise the OSF/1 linker may silently trash the .lit{4,8} |
| 57 | section contents. Also, .text must preceed .rdata. These differ |
| 58 | from the order described in some parts of the DEC OSF/1 Assembly |
| 59 | Language Programmer's Guide, but that order doesn't seem to work |
| 60 | with their linker. |
| 61 | |
| 62 | I don't know if section ordering on the MIPS is important. */ |
| 63 | |
| 64 | static const char *const names[] = |
| 65 | { |
| 66 | /* text segment */ |
| 67 | ".text", ".rdata", ".init", ".fini", |
| 68 | /* data segment */ |
| 69 | ".data", ".lita", ".lit8", ".lit4", ".sdata", ".got", |
| 70 | /* bss segment */ |
| 71 | ".sbss", ".bss", |
| 72 | }; |
| 73 | #define n_names ((int) (sizeof (names) / sizeof (names[0]))) |
| 74 | |
| 75 | /* Sections that match names, order to be straightened out later. */ |
| 76 | asection *secs[n_names]; |
| 77 | int i; |
| 78 | |
| 79 | addr = 0; |
| 80 | for (i = 0; i < n_names; i++) |
| 81 | secs[i] = NULL; |
| 82 | |
| 83 | for (sec = stdoutput->sections; sec != NULL; sec = sec->next) |
| 84 | { |
| 85 | for (i = 0; i < n_names; i++) |
| 86 | if (!strcmp (sec->name, names[i])) |
| 87 | { |
| 88 | secs[i] = sec; |
| 89 | bfd_section_list_remove (stdoutput, sec); |
| 90 | break; |
| 91 | } |
| 92 | if (i == n_names) |
| 93 | { |
| 94 | bfd_set_section_vma (stdoutput, sec, addr); |
| 95 | addr += bfd_section_size (stdoutput, sec); |
| 96 | } |
| 97 | } |
| 98 | for (i = 0; i < n_names; i++) |
| 99 | if (secs[i]) |
| 100 | { |
| 101 | bfd_set_section_vma (stdoutput, secs[i], addr); |
| 102 | addr += bfd_section_size (stdoutput, secs[i]); |
| 103 | } |
| 104 | for (i = n_names - 1; i >= 0; i--) |
| 105 | if (secs[i]) |
| 106 | bfd_section_list_prepend (stdoutput, secs[i]); |
| 107 | |
| 108 | /* Fill in the register masks. */ |
| 109 | { |
| 110 | unsigned long gprmask = 0; |
| 111 | unsigned long fprmask = 0; |
| 112 | unsigned long *cprmask = NULL; |
| 113 | |
| 114 | #ifdef TC_MIPS |
| 115 | /* Fill in the MIPS register masks. It's probably not worth |
| 116 | setting up a generic interface for this. */ |
| 117 | gprmask = mips_gprmask; |
| 118 | cprmask = mips_cprmask; |
| 119 | #endif |
| 120 | |
| 121 | #ifdef TC_ALPHA |
| 122 | alpha_frob_ecoff_data (); |
| 123 | |
| 124 | if (! bfd_ecoff_set_gp_value (stdoutput, alpha_gp_value)) |
| 125 | as_fatal (_("Can't set GP value")); |
| 126 | |
| 127 | gprmask = alpha_gprmask; |
| 128 | fprmask = alpha_fprmask; |
| 129 | #endif |
| 130 | |
| 131 | if (! bfd_ecoff_set_regmasks (stdoutput, gprmask, fprmask, cprmask)) |
| 132 | as_fatal (_("Can't set register masks")); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | /* Swap out the symbols and debugging information for BFD. */ |
| 137 | |
| 138 | void |
| 139 | ecoff_frob_file (void) |
| 140 | { |
| 141 | const struct ecoff_debug_swap * const debug_swap |
| 142 | = &ecoff_backend (stdoutput)->debug_swap; |
| 143 | bfd_vma addr ATTRIBUTE_UNUSED; |
| 144 | HDRR *hdr; |
| 145 | char *buf; |
| 146 | char *set; |
| 147 | |
| 148 | /* Build the ECOFF debugging information. */ |
| 149 | assert (ecoff_data (stdoutput) != 0); |
| 150 | hdr = &ecoff_data (stdoutput)->debug_info.symbolic_header; |
| 151 | ecoff_build_debug (hdr, &buf, debug_swap); |
| 152 | |
| 153 | /* Finish up the ecoff_tdata structure. */ |
| 154 | set = buf; |
| 155 | #define SET(ptr, count, type, size) \ |
| 156 | if (hdr->count == 0) \ |
| 157 | ecoff_data (stdoutput)->debug_info.ptr = NULL; \ |
| 158 | else \ |
| 159 | { \ |
| 160 | ecoff_data (stdoutput)->debug_info.ptr = (type) set; \ |
| 161 | set += hdr->count * size; \ |
| 162 | } |
| 163 | |
| 164 | SET (line, cbLine, unsigned char *, sizeof (unsigned char)); |
| 165 | SET (external_dnr, idnMax, void *, debug_swap->external_dnr_size); |
| 166 | SET (external_pdr, ipdMax, void *, debug_swap->external_pdr_size); |
| 167 | SET (external_sym, isymMax, void *, debug_swap->external_sym_size); |
| 168 | SET (external_opt, ioptMax, void *, debug_swap->external_opt_size); |
| 169 | SET (external_aux, iauxMax, union aux_ext *, sizeof (union aux_ext)); |
| 170 | SET (ss, issMax, char *, sizeof (char)); |
| 171 | SET (ssext, issExtMax, char *, sizeof (char)); |
| 172 | SET (external_rfd, crfd, void *, debug_swap->external_rfd_size); |
| 173 | SET (external_fdr, ifdMax, void *, debug_swap->external_fdr_size); |
| 174 | SET (external_ext, iextMax, void *, debug_swap->external_ext_size); |
| 175 | #undef SET |
| 176 | } |
| 177 | |
| 178 | /* This is called by the ECOFF code to set the external information |
| 179 | for a symbol. We just pass it on to BFD, which expects the swapped |
| 180 | information to be stored in the native field of the symbol. */ |
| 181 | |
| 182 | void |
| 183 | obj_ecoff_set_ext (symbolS *sym, EXTR *ext) |
| 184 | { |
| 185 | const struct ecoff_debug_swap * const debug_swap |
| 186 | = &ecoff_backend (stdoutput)->debug_swap; |
| 187 | ecoff_symbol_type *esym; |
| 188 | |
| 189 | know (bfd_asymbol_flavour (symbol_get_bfdsym (sym)) |
| 190 | == bfd_target_ecoff_flavour); |
| 191 | esym = ecoffsymbol (symbol_get_bfdsym (sym)); |
| 192 | esym->local = FALSE; |
| 193 | esym->native = xmalloc (debug_swap->external_ext_size); |
| 194 | (*debug_swap->swap_ext_out) (stdoutput, ext, esym->native); |
| 195 | } |
| 196 | |
| 197 | static int |
| 198 | ecoff_sec_sym_ok_for_reloc (asection *sec ATTRIBUTE_UNUSED) |
| 199 | { |
| 200 | return 1; |
| 201 | } |
| 202 | |
| 203 | static void |
| 204 | obj_ecoff_frob_symbol (symbolS *sym, int *puntp ATTRIBUTE_UNUSED) |
| 205 | { |
| 206 | ecoff_frob_symbol (sym); |
| 207 | } |
| 208 | |
| 209 | static void |
| 210 | ecoff_pop_insert (void) |
| 211 | { |
| 212 | pop_insert (obj_pseudo_table); |
| 213 | } |
| 214 | |
| 215 | static int |
| 216 | ecoff_separate_stab_sections (void) |
| 217 | { |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | /* These are the pseudo-ops we support in this file. Only those |
| 222 | relating to debugging information are supported here. |
| 223 | |
| 224 | The following pseudo-ops from the Kane and Heinrich MIPS book |
| 225 | should be defined here, but are currently unsupported: .aent, |
| 226 | .bgnb, .endb, .verstamp, .vreg. |
| 227 | |
| 228 | The following pseudo-ops from the Kane and Heinrich MIPS book are |
| 229 | MIPS CPU specific, and should be defined by tc-mips.c: .alias, |
| 230 | .extern, .galive, .gjaldef, .gjrlive, .livereg, .noalias, .option, |
| 231 | .rdata, .sdata, .set. |
| 232 | |
| 233 | The following pseudo-ops from the Kane and Heinrich MIPS book are |
| 234 | not MIPS CPU specific, but are also not ECOFF specific. I have |
| 235 | only listed the ones which are not already in read.c. It's not |
| 236 | completely clear where these should be defined, but tc-mips.c is |
| 237 | probably the most reasonable place: .asciiz, .asm0, .endr, .err, |
| 238 | .half, .lab, .repeat, .struct, .weakext. */ |
| 239 | |
| 240 | const pseudo_typeS obj_pseudo_table[] = |
| 241 | { |
| 242 | /* COFF style debugging information. .ln is not used; .loc is used |
| 243 | instead. */ |
| 244 | { "def", ecoff_directive_def, 0 }, |
| 245 | { "dim", ecoff_directive_dim, 0 }, |
| 246 | { "endef", ecoff_directive_endef, 0 }, |
| 247 | { "file", ecoff_directive_file, 0 }, |
| 248 | { "scl", ecoff_directive_scl, 0 }, |
| 249 | { "size", ecoff_directive_size, 0 }, |
| 250 | { "esize", ecoff_directive_size, 0 }, |
| 251 | { "tag", ecoff_directive_tag, 0 }, |
| 252 | { "type", ecoff_directive_type, 0 }, |
| 253 | { "etype", ecoff_directive_type, 0 }, |
| 254 | { "val", ecoff_directive_val, 0 }, |
| 255 | |
| 256 | /* ECOFF specific debugging information. */ |
| 257 | { "begin", ecoff_directive_begin, 0 }, |
| 258 | { "bend", ecoff_directive_bend, 0 }, |
| 259 | { "end", ecoff_directive_end, 0 }, |
| 260 | { "ent", ecoff_directive_ent, 0 }, |
| 261 | { "fmask", ecoff_directive_fmask, 0 }, |
| 262 | { "frame", ecoff_directive_frame, 0 }, |
| 263 | { "loc", ecoff_directive_loc, 0 }, |
| 264 | { "mask", ecoff_directive_mask, 0 }, |
| 265 | |
| 266 | /* Other ECOFF directives. */ |
| 267 | { "extern", ecoff_directive_extern, 0 }, |
| 268 | |
| 269 | #ifndef TC_MIPS |
| 270 | /* For TC_MIPS, tc-mips.c adds this. */ |
| 271 | { "weakext", ecoff_directive_weakext, 0 }, |
| 272 | #endif |
| 273 | |
| 274 | /* These are used on Irix. I don't know how to implement them. */ |
| 275 | { "bgnb", s_ignore, 0 }, |
| 276 | { "endb", s_ignore, 0 }, |
| 277 | { "verstamp", s_ignore, 0 }, |
| 278 | |
| 279 | /* Sentinel. */ |
| 280 | { NULL, s_ignore, 0 } |
| 281 | }; |
| 282 | |
| 283 | const struct format_ops ecoff_format_ops = |
| 284 | { |
| 285 | bfd_target_ecoff_flavour, |
| 286 | 0, /* dfl_leading_underscore. */ |
| 287 | |
| 288 | /* FIXME: A comment why emit_section_symbols is different here (1) from |
| 289 | the single-format definition (0) would be in order. */ |
| 290 | 1, /* emit_section_symbols. */ |
| 291 | 0, /* begin. */ |
| 292 | ecoff_new_file, |
| 293 | obj_ecoff_frob_symbol, |
| 294 | ecoff_frob_file, |
| 295 | 0, /* frob_file_before_adjust. */ |
| 296 | ecoff_frob_file_before_fix, |
| 297 | 0, /* frob_file_after_relocs. */ |
| 298 | 0, /* s_get_size. */ |
| 299 | 0, /* s_set_size. */ |
| 300 | 0, /* s_get_align. */ |
| 301 | 0, /* s_set_align. */ |
| 302 | 0, /* s_get_other. */ |
| 303 | 0, /* s_set_other. */ |
| 304 | 0, /* s_get_desc. */ |
| 305 | 0, /* s_set_desc. */ |
| 306 | 0, /* s_get_type. */ |
| 307 | 0, /* s_set_type. */ |
| 308 | 0, /* copy_symbol_attributes. */ |
| 309 | ecoff_generate_asm_lineno, |
| 310 | ecoff_stab, |
| 311 | ecoff_separate_stab_sections, |
| 312 | 0, /* init_stab_section. */ |
| 313 | ecoff_sec_sym_ok_for_reloc, |
| 314 | ecoff_pop_insert, |
| 315 | ecoff_set_ext, |
| 316 | ecoff_read_begin_hook, |
| 317 | ecoff_symbol_new_hook |
| 318 | }; |