1 /* BFD back end for traditional Unix core files (U-area and raw sections) 2 Copyright (C) 1988-2016 Free Software Foundation, Inc. 3 Written by John Gilmore of Cygnus Support. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "libbfd.h" 25 #include "libaout.h" /* BFD a.out internal data structures */ 26 27 #include <sys/param.h> 28 #ifdef HAVE_DIRENT_H 29 # include <dirent.h> 30 #else 31 # ifdef HAVE_SYS_NDIR_H 32 # include <sys/ndir.h> 33 # endif 34 # ifdef HAVE_SYS_DIR_H 35 # include <sys/dir.h> 36 # endif 37 # ifdef HAVE_NDIR_H 38 # include <ndir.h> 39 # endif 40 #endif 41 #include <signal.h> 42 43 #include <sys/user.h> /* After a.out.h */ 44 45 #ifdef TRAD_HEADER 46 #include TRAD_HEADER 47 #endif 48 49 #ifndef NBPG 50 # define NBPG getpagesize() 51 #endif 52 53 struct trad_core_struct 54 { 55 asection *data_section; 56 asection *stack_section; 57 asection *reg_section; 58 struct user u; 59 }; 60 61 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 62 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 63 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 64 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 65 66 /* forward declarations */ 67 68 #define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 69 #define trad_unix_core_file_pid _bfd_nocore_core_file_pid 70 71 72 /* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 73 74 static const bfd_target * 75 trad_unix_core_file_p (bfd *abfd) 76 { 77 int val; 78 struct user u; 79 struct trad_core_struct *rawptr; 80 bfd_size_type amt; 81 flagword flags; 82 83 #ifdef TRAD_CORE_USER_OFFSET 84 /* If defined, this macro is the file position of the user struct. */ 85 if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) 86 return 0; 87 #endif 88 89 val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd); 90 if (val != sizeof u) 91 { 92 /* Too small to be a core file */ 93 bfd_set_error (bfd_error_wrong_format); 94 return 0; 95 } 96 97 /* Sanity check perhaps??? */ 98 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ 99 { 100 bfd_set_error (bfd_error_wrong_format); 101 return 0; 102 } 103 if (u.u_ssize > 0x1000000) 104 { 105 bfd_set_error (bfd_error_wrong_format); 106 return 0; 107 } 108 109 /* Check that the size claimed is no greater than the file size. */ 110 { 111 struct stat statbuf; 112 113 if (bfd_stat (abfd, &statbuf) < 0) 114 return 0; 115 116 if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize 117 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 118 - u.u_tsize 119 #endif 120 + u.u_ssize) 121 > (ufile_ptr) statbuf.st_size) 122 { 123 bfd_set_error (bfd_error_wrong_format); 124 return 0; 125 } 126 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 127 if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize) 128 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED 129 /* Some systems write the file too big. */ 130 + TRAD_CORE_EXTRA_SIZE_ALLOWED 131 #endif 132 ) 133 < (ufile_ptr) statbuf.st_size) 134 { 135 /* The file is too big. Maybe it's not a core file 136 or we otherwise have bad values for u_dsize and u_ssize). */ 137 bfd_set_error (bfd_error_wrong_format); 138 return 0; 139 } 140 #endif 141 } 142 143 /* OK, we believe you. You're a core file (sure, sure). */ 144 145 /* Allocate both the upage and the struct core_data at once, so 146 a single free() will free them both. */ 147 amt = sizeof (struct trad_core_struct); 148 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt); 149 if (rawptr == NULL) 150 return 0; 151 152 abfd->tdata.trad_core_data = rawptr; 153 154 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 155 156 /* Create the sections. */ 157 158 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 159 core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 160 flags); 161 if (core_stacksec (abfd) == NULL) 162 goto fail; 163 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 164 flags); 165 if (core_datasec (abfd) == NULL) 166 goto fail; 167 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 168 SEC_HAS_CONTENTS); 169 if (core_regsec (abfd) == NULL) 170 goto fail; 171 172 core_datasec (abfd)->size = NBPG * u.u_dsize 173 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 174 - NBPG * u.u_tsize 175 #endif 176 ; 177 core_stacksec (abfd)->size = NBPG * u.u_ssize; 178 core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */ 179 180 /* What a hack... we'd like to steal it from the exec file, 181 since the upage does not seem to provide it. FIXME. */ 182 #ifdef HOST_DATA_START_ADDR 183 core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 184 #else 185 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 186 #endif 187 188 #ifdef HOST_STACK_START_ADDR 189 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; 190 #else 191 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); 192 #endif 193 194 /* This is tricky. As the "register section", we give them the entire 195 upage and stack. u.u_ar0 points to where "register 0" is stored. 196 There are two tricks with this, though. One is that the rest of the 197 registers might be at positive or negative (or both) displacements 198 from *u_ar0. The other is that u_ar0 is sometimes an absolute address 199 in kernel memory, and on other systems it is an offset from the beginning 200 of the `struct user'. 201 202 As a practical matter, we don't know where the registers actually are, 203 so we have to pass the whole area to GDB. We encode the value of u_ar0 204 by setting the .regs section up so that its virtual memory address 205 0 is at the place pointed to by u_ar0 (by setting the vma of the start 206 of the section to -u_ar0). GDB uses this info to locate the regs, 207 using minor trickery to get around the offset-or-absolute-addr problem. */ 208 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0; 209 210 core_datasec (abfd)->filepos = NBPG * UPAGES; 211 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize 212 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 213 - NBPG * u.u_tsize 214 #endif 215 ; 216 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ 217 218 /* Align to word at least */ 219 core_stacksec (abfd)->alignment_power = 2; 220 core_datasec (abfd)->alignment_power = 2; 221 core_regsec (abfd)->alignment_power = 2; 222 223 return abfd->xvec; 224 225 fail: 226 bfd_release (abfd, abfd->tdata.any); 227 abfd->tdata.any = NULL; 228 bfd_section_list_clear (abfd); 229 return NULL; 230 } 231 232 static char * 233 trad_unix_core_file_failing_command (bfd *abfd) 234 { 235 #ifndef NO_CORE_COMMAND 236 char *com = abfd->tdata.trad_core_data->u.u_comm; 237 if (*com) 238 return com; 239 else 240 #endif 241 return 0; 242 } 243 244 static int 245 trad_unix_core_file_failing_signal (bfd *ignore_abfd ATTRIBUTE_UNUSED) 246 { 247 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL 248 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); 249 #else 250 return -1; /* FIXME, where is it? */ 251 #endif 252 } 253 254 /* If somebody calls any byte-swapping routines, shoot them. */ 256 static void 257 swap_abort (void) 258 { 259 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 260 } 261 262 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 263 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 264 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 265 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 266 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 267 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 268 269 const bfd_target core_trad_vec = 270 { 271 "trad-core", 272 bfd_target_unknown_flavour, 273 BFD_ENDIAN_UNKNOWN, /* target byte order */ 274 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 275 (HAS_RELOC | EXEC_P | /* object flags */ 276 HAS_LINENO | HAS_DEBUG | 277 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 278 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 279 0, /* symbol prefix */ 280 ' ', /* ar_pad_char */ 281 16, /* ar_max_namelen */ 282 0, /* match priority. */ 283 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 284 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 285 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 286 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 287 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 288 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 289 290 { /* bfd_check_format */ 291 _bfd_dummy_target, /* unknown format */ 292 _bfd_dummy_target, /* object file */ 293 _bfd_dummy_target, /* archive */ 294 trad_unix_core_file_p /* a core file */ 295 }, 296 { /* bfd_set_format */ 297 bfd_false, bfd_false, 298 bfd_false, bfd_false 299 }, 300 { /* bfd_write_contents */ 301 bfd_false, bfd_false, 302 bfd_false, bfd_false 303 }, 304 305 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 306 BFD_JUMP_TABLE_COPY (_bfd_generic), 307 BFD_JUMP_TABLE_CORE (trad_unix), 308 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 309 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 310 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 311 BFD_JUMP_TABLE_WRITE (_bfd_generic), 312 BFD_JUMP_TABLE_LINK (_bfd_nolink), 313 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 314 315 NULL, 316 317 NULL /* backend_data */ 318 }; 319
