1 /* IBM RS/6000 "XCOFF" back-end for BFD. 2 Copyright (C) 2001-2022 Free Software Foundation, Inc. 3 Written by Tom Rix 4 Contributed by Red Hat Inc. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "sysdep.h" 24 #include "bfd.h" 25 26 bfd_cleanup xcoff64_core_p (bfd *); 27 bool xcoff64_core_file_matches_executable_p (bfd *, bfd *); 28 char *xcoff64_core_file_failing_command (bfd *); 29 int xcoff64_core_file_failing_signal (bfd *); 30 31 #ifdef AIX_5_CORE 32 33 #include "libbfd.h" 34 35 /* Aix 5.1 system include file. */ 36 37 /* Need to define this macro so struct ld_info64 get included. */ 38 #define __LDINFO_PTRACE64__ 39 #include <sys/ldr.h> 40 #include <core.h> 41 42 /* The default architecture and machine for matching core files. */ 43 #define DEFAULT_ARCHITECTURE bfd_arch_powerpc 44 #define DEFAULT_MACHINE bfd_mach_ppc_620 45 46 #define core_hdr(abfd) ((struct core_dumpxx *) abfd->tdata.any) 47 48 #define CHECK_FILE_OFFSET(s, v) \ 49 ((bfd_signed_vma)(v) < 0 || (bfd_signed_vma)(v) > (bfd_signed_vma)(s).st_size) 50 51 bfd_cleanup 52 xcoff64_core_p (bfd *abfd) 53 { 54 enum bfd_architecture arch; 55 unsigned long mach; 56 struct core_dumpxx core, *new_core_hdr; 57 struct stat statbuf; 58 asection *sec; 59 struct __ld_info64 ldinfo; 60 bfd_vma ld_offset; 61 bfd_size_type i; 62 struct vm_infox vminfo; 63 flagword flags; 64 65 /* Get the header. */ 66 if (bfd_seek (abfd, 0, SEEK_SET) != 0) 67 goto xcoff64_core_p_error; 68 69 if (sizeof (struct core_dumpxx) 70 != bfd_bread (&core, sizeof (struct core_dumpxx), abfd)) 71 goto xcoff64_core_p_error; 72 73 if (bfd_stat (abfd, &statbuf) < 0) 74 goto xcoff64_core_p_error; 75 76 /* Sanity checks 77 c_flag has CORE_VERSION_1, Aix 4+ 78 c_entries = 0 for Aix 4.3+ 79 IS_PROC64 is a macro defined in procinfo.h, test for 64 bit process. 80 81 We will still be confused if a Aix 4.3 64 bit core file is 82 copied over to a Aix 5 machine. 83 84 Check file header offsets 85 86 See rs6000-core.c for comment on size of core 87 If there isn't enough of a real core file, bail. */ 88 89 if ((CORE_VERSION_1 != (core.c_flag & CORE_VERSION_1)) 90 || (0 != core.c_entries) 91 || (! (IS_PROC64 (&core.c_u.U_proc))) 92 || ((CHECK_FILE_OFFSET (statbuf, core.c_fdsinfox))) 93 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader))) 94 || ((CHECK_FILE_OFFSET (statbuf, core.c_loader + core.c_lsize))) 95 || ((CHECK_FILE_OFFSET (statbuf, core.c_thr))) 96 || ((CHECK_FILE_OFFSET (statbuf, core.c_segregion))) 97 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack))) 98 || ((CHECK_FILE_OFFSET (statbuf, core.c_stack + core.c_size))) 99 || ((CHECK_FILE_OFFSET (statbuf, core.c_data))) 100 || ((CHECK_FILE_OFFSET (statbuf, core.c_data + core.c_datasize))) 101 || (! (core.c_flag & UBLOCK_VALID)) 102 || (! (core.c_flag & LE_VALID))) 103 goto xcoff64_core_p_error; 104 105 /* Check for truncated stack or general truncating. */ 106 if ((! (core.c_flag & USTACK_VALID)) 107 || (core.c_flag & CORE_TRUNC)) 108 { 109 bfd_set_error (bfd_error_file_truncated); 110 111 return NULL; 112 } 113 114 new_core_hdr = bfd_zalloc (abfd, sizeof (struct core_dumpxx)); 115 if (NULL == new_core_hdr) 116 return NULL; 117 118 memcpy (new_core_hdr, &core, sizeof (struct core_dumpxx)); 119 /* The core_hdr() macro is no longer used here because it would 120 expand to code relying on gcc's cast-as-lvalue extension, 121 which was removed in gcc 4.0. */ 122 abfd->tdata.any = new_core_hdr; 123 124 /* .stack section. */ 125 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 126 sec = bfd_make_section_anyway_with_flags (abfd, ".stack", flags); 127 if (NULL == sec) 128 return NULL; 129 130 sec->size = core.c_size; 131 sec->vma = core.c_stackorg; 132 sec->filepos = core.c_stack; 133 134 /* .reg section for all registers. */ 135 flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY; 136 sec = bfd_make_section_anyway_with_flags (abfd, ".reg", flags); 137 if (NULL == sec) 138 return NULL; 139 140 sec->size = sizeof (struct __context64); 141 sec->vma = 0; 142 sec->filepos = 0; 143 sec->contents = (bfd_byte *)&new_core_hdr->c_flt.r64; 144 145 /* .ldinfo section. 146 To actually find out how long this section is in this particular 147 core dump would require going down the whole list of struct 148 ld_info's. See if we can just fake it. */ 149 flags = SEC_HAS_CONTENTS; 150 sec = bfd_make_section_anyway_with_flags (abfd, ".ldinfo", flags); 151 if (NULL == sec) 152 return NULL; 153 154 sec->size = core.c_lsize; 155 sec->vma = 0; 156 sec->filepos = core.c_loader; 157 158 /* AIX 4 adds data sections from loaded objects to the core file, 159 which can be found by examining ldinfo, and anonymously mmapped 160 regions. */ 161 162 /* .data section from executable. */ 163 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 164 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags); 165 if (NULL == sec) 166 return NULL; 167 168 sec->size = core.c_datasize; 169 sec->vma = core.c_dataorg; 170 sec->filepos = core.c_data; 171 172 /* .data sections from loaded objects. */ 173 ld_offset = core.c_loader; 174 175 while (1) 176 { 177 if (bfd_seek (abfd, ld_offset, SEEK_SET) != 0) 178 return NULL; 179 180 if (sizeof (struct __ld_info64) != 181 bfd_bread (&ldinfo, sizeof (struct __ld_info64), abfd)) 182 return NULL; 183 184 if (ldinfo.ldinfo_core) 185 { 186 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 187 sec = bfd_make_section_anyway_with_flags (abfd, ".data", flags); 188 if (NULL == sec) 189 return NULL; 190 191 sec->size = ldinfo.ldinfo_datasize; 192 sec->vma = ldinfo.ldinfo_dataorg; 193 sec->filepos = ldinfo.ldinfo_core; 194 } 195 196 if (0 == ldinfo.ldinfo_next) 197 break; 198 ld_offset += ldinfo.ldinfo_next; 199 } 200 201 /* .vmdata sections from anonymously mmapped regions. */ 202 if (core.c_vmregions) 203 { 204 if (bfd_seek (abfd, core.c_vmm, SEEK_SET) != 0) 205 return NULL; 206 207 for (i = 0; i < core.c_vmregions; i++) 208 if (sizeof (struct vm_infox) != 209 bfd_bread (&vminfo, sizeof (struct vm_infox), abfd)) 210 return NULL; 211 212 if (vminfo.vminfo_offset) 213 { 214 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; 215 sec = bfd_make_section_anyway_with_flags (abfd, ".vmdata", flags); 216 if (NULL == sec) 217 return NULL; 218 219 sec->size = vminfo.vminfo_size; 220 sec->vma = vminfo.vminfo_addr; 221 sec->filepos = vminfo.vminfo_offset; 222 } 223 } 224 225 /* Set the architecture and machine. */ 226 arch = DEFAULT_ARCHITECTURE; 227 mach = DEFAULT_MACHINE; 228 bfd_default_set_arch_mach (abfd, arch, mach); 229 230 return _bfd_no_cleanup; 231 232 xcoff64_core_p_error: 233 if (bfd_get_error () != bfd_error_system_call) 234 bfd_set_error (bfd_error_wrong_format); 235 236 return NULL; 237 } 238 239 /* Return `TRUE' if given core is from the given executable. */ 240 241 bool 242 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) 243 { 244 struct core_dumpxx core; 245 char *path, *s; 246 size_t alloc; 247 const char *str1, *str2; 248 bool return_value = false; 249 250 /* Get the header. */ 251 if (bfd_seek (core_bfd, 0, SEEK_SET) != 0) 252 return return_value; 253 254 if (sizeof (struct core_dumpxx) != 255 bfd_bread (&core, sizeof (struct core_dumpxx), core_bfd)) 256 return return_value; 257 258 if (bfd_seek (core_bfd, core.c_loader, SEEK_SET) != 0) 259 return return_value; 260 261 alloc = 100; 262 path = bfd_malloc (alloc); 263 if (path == NULL) 264 return return_value; 265 266 s = path; 267 268 while (1) 269 { 270 if (bfd_bread (s, 1, core_bfd) != 1) 271 goto xcoff64_core_file_matches_executable_p_end_1; 272 273 if (*s == '\0') 274 break; 275 ++s; 276 if (s == path + alloc) 277 { 278 char *n; 279 280 alloc *= 2; 281 n = bfd_realloc (path, alloc); 282 if (n == NULL) 283 goto xcoff64_core_file_matches_executable_p_end_1; 284 285 s = n + (path - s); 286 path = n; 287 } 288 } 289 290 str1 = strrchr (path, '/'); 291 str2 = strrchr (bfd_get_filename (exec_bfd), '/'); 292 293 /* Step over character '/'. */ 294 str1 = str1 != NULL ? str1 + 1 : path; 295 str2 = str2 != NULL ? str2 + 1 : bfd_get_filename (exec_bfd); 296 297 if (strcmp (str1, str2) == 0) 298 return_value = true; 299 300 xcoff64_core_file_matches_executable_p_end_1: 301 free (path); 302 return return_value; 303 } 304 305 char * 306 xcoff64_core_file_failing_command (bfd *abfd) 307 { 308 struct core_dumpxx *c = core_hdr (abfd); 309 char *return_value = 0; 310 311 if (NULL != c) 312 return_value = c->c_u.U_proc.pi_comm; 313 314 return return_value; 315 } 316 317 int 318 xcoff64_core_file_failing_signal (bfd *abfd) 319 { 320 struct core_dumpxx *c = core_hdr (abfd); 321 int return_value = 0; 322 323 if (NULL != c) 324 return_value = c->c_signo; 325 326 return return_value; 327 } 328 329 #else /* AIX_5_CORE */ 330 331 bfd_cleanup 332 xcoff64_core_p (bfd *abfd ATTRIBUTE_UNUSED) 333 { 334 bfd_set_error (bfd_error_wrong_format); 335 return 0; 336 } 337 338 bool 339 xcoff64_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) 340 { 341 return generic_core_file_matches_executable_p (core_bfd, exec_bfd); 342 } 343 344 char * 345 xcoff64_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED) 346 { 347 return 0; 348 } 349 350 int 351 xcoff64_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED) 352 { 353 return 0; 354 } 355 356 #endif /* AIX_5_CORE */ 357