1 /* IBM RS/6000 "XCOFF" back-end for BFD. 2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 3 Free Software Foundation, Inc. 4 Written by Tom Rix 5 Contributed by Red Hat Inc. 6 7 This file is part of BFD, the Binary File Descriptor library. 8 9 This program 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 3 of the License, or 12 (at your option) any later version. 13 14 This program 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 this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 22 MA 02110-1301, USA. */ 23 24 #include "sysdep.h" 25 #include "bfd.h" 26 27 const bfd_target *xcoff64_core_p (bfd *); 28 bfd_boolean xcoff64_core_file_matches_executable_p (bfd *, bfd *); 29 char *xcoff64_core_file_failing_command (bfd *); 30 int xcoff64_core_file_failing_signal (bfd *); 31 32 #ifdef AIX_5_CORE 33 34 #include "libbfd.h" 35 36 /* Aix 5.1 system include file. */ 37 38 /* Need to define this macro so struct ld_info64 get included. */ 39 #define __LDINFO_PTRACE64__ 40 #include <sys/ldr.h> 41 #include <core.h> 42 43 /* The default architecture and machine for matching core files. */ 44 #define DEFAULT_ARCHITECTURE bfd_arch_powerpc 45 #define DEFAULT_MACHINE bfd_mach_ppc_620 46 47 #define core_hdr(abfd) ((struct core_dumpxx *) abfd->tdata.any) 48 49 #define CHECK_FILE_OFFSET(s, v) \ 50 ((bfd_signed_vma)(v) < 0 || (bfd_signed_vma)(v) > (bfd_signed_vma)(s).st_size) 51 52 const bfd_target * 53 xcoff64_core_p (bfd *abfd) 54 { 55 enum bfd_architecture arch; 56 unsigned long mach; 57 struct core_dumpxx core, *new_core_hdr; 58 struct stat statbuf; 59 asection *sec; 60 struct __ld_info64 ldinfo; 61 bfd_vma ld_offset; 62 bfd_size_type i; 63 struct vm_infox vminfo; 64 const bfd_target *return_value = NULL; 65 flagword flags; 66 67 /* Get the header. */ 68 if (bfd_seek (abfd, 0, SEEK_SET) != 0) 69 goto xcoff64_core_p_error; 70 71 if (sizeof (struct core_dumpxx) 72 != bfd_bread (&core, sizeof (struct core_dumpxx), abfd)) 73 goto xcoff64_core_p_error; 74 75 if (bfd_stat (abfd, &statbuf) < 0) 76 goto xcoff64_core_p_error; 77 78 /* Sanity checks 79 c_flag has CORE_VERSION_1, Aix 4+ 80 c_entries = 0 for Aix 4.3+ 81 IS_PROC64 is a macro defined in procinfo.h, test for 64 bit process. 82 83 We will still be confused if a Aix 4.3 64 bit core file is 84 copied over to a Aix 5 machine. 85 86 Check file header offsets 87 88 See rs6000-core.c for comment on size of core 89 If there isn't enough of a real core file, bail. */ 90 91 if ((CORE_VERSION_1 != (core.c_flag & CORE_VERSION_1)) 92 || (0 != core.c_entries) 93 || (! (IS_PROC64 (&core.c_u.U_proc))) 94 || ((CHECK_FILE_OFFSET (statbuf, core.c_fdsinfox))) 95 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader))) 96 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader + core.c_lsize))) 97 || ((CHECK_FILE_OFFSET (statbuf, core.c_thr))) 98 || ((CHECK_FILE_OFFSET (statbuf, core.c_segregion))) 99 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack))) 100 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack + core.c_size))) 101 || ((CHECK_FILE_OFFSET (statbuf, core.c_data))) 102 || ((CHECK_FILE_OFFSET (statbuf, core.c_data + core.c_datasize))) 103 || (! (core.c_flag & UBLOCK_VALID)) 104 || (! (core.c_flag & LE_VALID))) 105 goto xcoff64_core_p_error; 106 107 /* Check for truncated stack or general truncating. */ 108 if ((! (core.c_flag & USTACK_VALID)) 109 || (core.c_flag & CORE_TRUNC)) 110 { 111 bfd_set_error (bfd_error_file_truncated); 112 113 return return_value; 114 } 115 116 new_core_hdr = bfd_zalloc (abfd, sizeof (struct core_dumpxx)); 117 if (NULL == new_core_hdr) 118 return return_value; 119 120 memcpy (new_core_hdr, &core, sizeof (struct core_dumpxx)); 121 /* The core_hdr() macro is no longer used here because it would 122 expand to code relying on gcc's cast-as-lvalue extension, 123 which was removed in gcc 4.0. */ 124 abfd->tdata.any = new_core_hdr; 125 126 /* .stack section. */ 127 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 128 sec = bfd_make_section_anyway_with_flags (abfd, ".stack", flags); 129 if (NULL == sec) 130 return return_value; 131 132 sec->size = core.c_size; 133 sec->vma = core.c_stackorg; 134 sec->filepos = core.c_stack; 135 136 /* .reg section for all registers. */ 137 flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY; 138 sec = bfd_make_section_anyway_with_flags (abfd, ".reg", flags); 139 if (NULL == sec) 140 return return_value; 141 142 sec->size = sizeof (struct __context64); 143 sec->vma = 0; 144 sec->filepos = 0; 145 sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64; 146 147 /* .ldinfo section. 148 To actually find out how long this section is in this particular 149 core dump would require going down the whole list of struct 150 ld_info's. See if we can just fake it. */ 151 flags = SEC_HAS_CONTENTS; 152 sec = bfd_make_section_anyway_with_flags (abfd, ".ldinfo", flags); 153 if (NULL == sec) 154 return return_value; 155 156 sec->size = core.c_lsize; 157 sec->vma = 0; 158 sec->filepos = core.c_loader; 159 160 /* AIX 4 adds data sections from loaded objects to the core file, 161 which can be found by examining ldinfo, and anonymously mmapped 162 regions. */ 163 164 /* .data section from executable. */ 165 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 166 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags); 167 if (NULL == sec) 168 return return_value; 169 170 sec->size = core.c_datasize; 171 sec->vma = core.c_dataorg; 172 sec->filepos = core.c_data; 173 174 /* .data sections from loaded objects. */ 175 ld_offset = core.c_loader; 176 177 while (1) 178 { 179 if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0) 180 return return_value; 181 182 if (sizeof (struct __ld_info64) != 183 bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd)) 184 return return_value; 185 186 if (ldinfo.ldinfo_core) 187 { 188 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 189 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags); 190 if (NULL == sec) 191 return return_value; 192 193 sec->size = ldinfo.ldinfo_datasize; 194 sec->vma = ldinfo.ldinfo_dataorg; 195 sec->filepos = ldinfo.ldinfo_core; 196 } 197 198 if (0 == ldinfo.ldinfo_next) 199 break; 200 ld_offset += ldinfo.ldinfo_next; 201 } 202 203 /* .vmdata sections from anonymously mmapped regions. */ 204 if (core.c_vmregions) 205 { 206 if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0) 207 return return_value; 208 209 for (i = 0; i < core.c_vmregions; i++) 210 if (sizeof (struct vm_infox) != 211 bfd_bread (&vminfo, sizeof (struct vm_infox), abfd)) 212 return return_value; 213 214 if (vminfo.vminfo_offset) 215 { 216 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 217 sec = bfd_make_section_anyway_with_flags (abfd, ".vmdata", flags); 218 if (NULL == sec) 219 return return_value; 220 221 sec->size = vminfo.vminfo_size; 222 sec->vma = vminfo.vminfo_addr; 223 sec->filepos = vminfo.vminfo_offset; 224 } 225 } 226 227 /* Set the architecture and machine. */ 228 arch = DEFAULT_ARCHITECTURE; 229 mach = DEFAULT_MACHINE; 230 bfd_default_set_arch_mach (abfd, arch, mach); 231 232 return_value = (bfd_target *) abfd->xvec; /* This is garbage for now. */ 233 234 xcoff64_core_p_error: 235 if (bfd_get_error () != bfd_error_system_call) 236 bfd_set_error (bfd_error_wrong_format); 237 238 return return_value; 239 } 240 241 /* Return `TRUE' if given core is from the given executable. */ 242 243 bfd_boolean 244 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) 245 { 246 struct core_dumpxx core; 247 char *path, *s; 248 size_t alloc; 249 const char *str1, *str2; 250 bfd_boolean return_value = FALSE; 251 252 /* Get the header. */ 253 if (bfd_seek (core_bfd, 0, SEEK_SET) != 0) 254 return return_value; 255 256 if (sizeof (struct core_dumpxx) != 257 bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd)) 258 return return_value; 259 260 if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0) 261 return return_value; 262 263 alloc = 100; 264 path = bfd_malloc (alloc); 265 if (path == NULL) 266 return return_value; 267 268 s = path; 269 270 while (1) 271 { 272 if (bfd_bread (s, 1, core_bfd) != 1) 273 goto xcoff64_core_file_matches_executable_p_end_1; 274 275 if (*s == '\0') 276 break; 277 ++s; 278 if (s == path + alloc) 279 { 280 char *n; 281 282 alloc *= 2; 283 n = bfd_realloc (path, alloc); 284 if (n == NULL) 285 goto xcoff64_core_file_matches_executable_p_end_1; 286 287 s = n + (path - s); 288 path = n; 289 } 290 } 291 292 str1 = strrchr (path, '/'); 293 str2 = strrchr (exec_bfd->filename, '/'); 294 295 /* Step over character '/'. */ 296 str1 = str1 != NULL ? str1 + 1 : path; 297 str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename; 298 299 if (strcmp (str1, str2) == 0) 300 return_value = TRUE; 301 302 xcoff64_core_file_matches_executable_p_end_1: 303 free (path); 304 return return_value; 305 } 306 307 char * 308 xcoff64_core_file_failing_command (bfd *abfd) 309 { 310 struct core_dumpxx *c = core_hdr (abfd); 311 char *return_value = 0; 312 313 if (NULL != c) 314 return_value = c->c_u.U_proc.pi_comm; 315 316 return return_value; 317 } 318 319 int 320 xcoff64_core_file_failing_signal (bfd *abfd) 321 { 322 struct core_dumpxx *c = core_hdr (abfd); 323 int return_value = 0; 324 325 if (NULL != c) 326 return_value = c->c_signo; 327 328 return return_value; 329 } 330 331 #else /* AIX_5_CORE */ 332 333 const bfd_target * 334 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED) 335 { 336 bfd_set_error (bfd_error_wrong_format); 337 return 0; 338 } 339 340 bfd_boolean 341 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) 342 { 343 return generic_core_file_matches_executable_p (core_bfd, exec_bfd); 344 } 345 346 char * 347 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED) 348 { 349 return 0; 350 } 351 352 int 353 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED) 354 { 355 return 0; 356 } 357 358 #endif /* AIX_5_CORE */ 359