1/* BFD back end for traditional Unix core files (U-area and raw sections) 2 Copyright (C) 1988-2022 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#include <dirent.h> 29#include <signal.h> 30 31#include <sys/user.h> /* After a.out.h */ 32 33#ifdef TRAD_HEADER 34#include TRAD_HEADER 35#endif 36 37#ifndef NBPG 38# define NBPG getpagesize() 39#endif 40 41struct trad_core_struct 42{ 43 asection *data_section; 44 asection *stack_section; 45 asection *reg_section; 46 struct user u; 47}; 48 49#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 50#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 51#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 52#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 53 54/* forward declarations */ 55 56#define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 57#define trad_unix_core_file_pid _bfd_nocore_core_file_pid 58 59 60/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 61 62static bfd_cleanup 63trad_unix_core_file_p (bfd *abfd) 64{ 65 int val; 66 struct user u; 67 struct trad_core_struct *rawptr; 68 size_t amt; 69 flagword flags; 70 71#ifdef TRAD_CORE_USER_OFFSET 72 /* If defined, this macro is the file position of the user struct. */ 73 if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) 74 return 0; 75#endif 76 77 val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd); 78 if (val != sizeof u) 79 { 80 /* Too small to be a core file */ 81 bfd_set_error (bfd_error_wrong_format); 82 return 0; 83 } 84 85 /* Sanity check perhaps??? */ 86 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ 87 { 88 bfd_set_error (bfd_error_wrong_format); 89 return 0; 90 } 91 if (u.u_ssize > 0x1000000) 92 { 93 bfd_set_error (bfd_error_wrong_format); 94 return 0; 95 } 96 97 /* Check that the size claimed is no greater than the file size. */ 98 { 99 struct stat statbuf; 100 101 if (bfd_stat (abfd, &statbuf) < 0) 102 return 0; 103 104 if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize 105#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 106 - u.u_tsize 107#endif 108 + u.u_ssize) 109 > (ufile_ptr) statbuf.st_size) 110 { 111 bfd_set_error (bfd_error_wrong_format); 112 return 0; 113 } 114#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 115 if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize) 116#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED 117 /* Some systems write the file too big. */ 118 + TRAD_CORE_EXTRA_SIZE_ALLOWED 119#endif 120 ) 121 < (ufile_ptr) statbuf.st_size) 122 { 123 /* The file is too big. Maybe it's not a core file 124 or we otherwise have bad values for u_dsize and u_ssize). */ 125 bfd_set_error (bfd_error_wrong_format); 126 return 0; 127 } 128#endif 129 } 130 131 /* OK, we believe you. You're a core file (sure, sure). */ 132 133 /* Allocate both the upage and the struct core_data at once, so 134 a single free() will free them both. */ 135 amt = sizeof (struct trad_core_struct); 136 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt); 137 if (rawptr == NULL) 138 return 0; 139 140 abfd->tdata.trad_core_data = rawptr; 141 142 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 143 144 /* Create the sections. */ 145 146 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 147 core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 148 flags); 149 if (core_stacksec (abfd) == NULL) 150 goto fail; 151 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 152 flags); 153 if (core_datasec (abfd) == NULL) 154 goto fail; 155 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 156 SEC_HAS_CONTENTS); 157 if (core_regsec (abfd) == NULL) 158 goto fail; 159 160 core_datasec (abfd)->size = NBPG * u.u_dsize 161#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 162 - NBPG * u.u_tsize 163#endif 164 ; 165 core_stacksec (abfd)->size = NBPG * u.u_ssize; 166 core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */ 167 168 /* What a hack... we'd like to steal it from the exec file, 169 since the upage does not seem to provide it. FIXME. */ 170#ifdef HOST_DATA_START_ADDR 171 core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 172#else 173 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 174#endif 175 176#ifdef HOST_STACK_START_ADDR 177 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; 178#else 179 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); 180#endif 181 182 /* This is tricky. As the "register section", we give them the entire 183 upage and stack. u.u_ar0 points to where "register 0" is stored. 184 There are two tricks with this, though. One is that the rest of the 185 registers might be at positive or negative (or both) displacements 186 from *u_ar0. The other is that u_ar0 is sometimes an absolute address 187 in kernel memory, and on other systems it is an offset from the beginning 188 of the `struct user'. 189 190 As a practical matter, we don't know where the registers actually are, 191 so we have to pass the whole area to GDB. We encode the value of u_ar0 192 by setting the .regs section up so that its virtual memory address 193 0 is at the place pointed to by u_ar0 (by setting the vma of the start 194 of the section to -u_ar0). GDB uses this info to locate the regs, 195 using minor trickery to get around the offset-or-absolute-addr problem. */ 196 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0; 197 198 core_datasec (abfd)->filepos = NBPG * UPAGES; 199 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize 200#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 201 - NBPG * u.u_tsize 202#endif 203 ; 204 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ 205 206 /* Align to word at least */ 207 core_stacksec (abfd)->alignment_power = 2; 208 core_datasec (abfd)->alignment_power = 2; 209 core_regsec (abfd)->alignment_power = 2; 210 211 return _bfd_no_cleanup; 212 213 fail: 214 bfd_release (abfd, abfd->tdata.any); 215 abfd->tdata.any = NULL; 216 bfd_section_list_clear (abfd); 217 return NULL; 218} 219 220static char * 221trad_unix_core_file_failing_command (bfd *abfd) 222{ 223#ifndef NO_CORE_COMMAND 224 char *com = abfd->tdata.trad_core_data->u.u_comm; 225 if (*com) 226 return com; 227 else 228#endif 229 return 0; 230} 231 232static int 233trad_unix_core_file_failing_signal (bfd *ignore_abfd ATTRIBUTE_UNUSED) 234{ 235#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL 236 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); 237#else 238 return -1; /* FIXME, where is it? */ 239#endif 240} 241 242/* If somebody calls any byte-swapping routines, shoot them. */ 243static void 244swap_abort (void) 245{ 246 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 247} 248 249#define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 250#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 251#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 252#define NO_GET64 ((uint64_t (*) (const void *)) swap_abort) 253#define NO_PUT64 ((void (*) (uint64_t, void *)) swap_abort) 254#define NO_GETS64 ((int64_t (*) (const void *)) swap_abort) 255 256const bfd_target core_trad_vec = 257 { 258 "trad-core", 259 bfd_target_unknown_flavour, 260 BFD_ENDIAN_UNKNOWN, /* target byte order */ 261 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 262 (HAS_RELOC | EXEC_P | /* object flags */ 263 HAS_LINENO | HAS_DEBUG | 264 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 265 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 266 0, /* symbol prefix */ 267 ' ', /* ar_pad_char */ 268 16, /* ar_max_namelen */ 269 0, /* match priority. */ 270 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */ 271 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 272 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 273 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 274 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 275 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 276 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 277 278 { /* bfd_check_format */ 279 _bfd_dummy_target, /* unknown format */ 280 _bfd_dummy_target, /* object file */ 281 _bfd_dummy_target, /* archive */ 282 trad_unix_core_file_p /* a core file */ 283 }, 284 { /* bfd_set_format */ 285 _bfd_bool_bfd_false_error, 286 _bfd_bool_bfd_false_error, 287 _bfd_bool_bfd_false_error, 288 _bfd_bool_bfd_false_error 289 }, 290 { /* bfd_write_contents */ 291 _bfd_bool_bfd_false_error, 292 _bfd_bool_bfd_false_error, 293 _bfd_bool_bfd_false_error, 294 _bfd_bool_bfd_false_error 295 }, 296 297 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 298 BFD_JUMP_TABLE_COPY (_bfd_generic), 299 BFD_JUMP_TABLE_CORE (trad_unix), 300 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 301 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 302 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 303 BFD_JUMP_TABLE_WRITE (_bfd_generic), 304 BFD_JUMP_TABLE_LINK (_bfd_nolink), 305 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 306 307 NULL, 308 309 NULL /* backend_data */ 310 }; 311