1167465Smp/* BFD back end for traditional Unix core files (U-area and raw sections) 259243Sobrien Copyright (C) 1988-2022 Free Software Foundation, Inc. 359243Sobrien Written by John Gilmore of Cygnus Support. 459243Sobrien 559243Sobrien This file is part of BFD, the Binary File Descriptor library. 659243Sobrien 759243Sobrien This program is free software; you can redistribute it and/or modify 859243Sobrien it under the terms of the GNU General Public License as published by 959243Sobrien the Free Software Foundation; either version 3 of the License, or 1059243Sobrien (at your option) any later version. 1159243Sobrien 1259243Sobrien This program is distributed in the hope that it will be useful, 1359243Sobrien but WITHOUT ANY WARRANTY; without even the implied warranty of 1459243Sobrien MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1559243Sobrien GNU General Public License for more details. 1659243Sobrien 17100616Smp You should have received a copy of the GNU General Public License 1859243Sobrien along with this program; if not, write to the Free Software 1959243Sobrien Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 2059243Sobrien MA 02110-1301, USA. */ 2159243Sobrien 2259243Sobrien#include "sysdep.h" 2359243Sobrien#include "bfd.h" 2459243Sobrien#include "libbfd.h" 2559243Sobrien#include "libaout.h" /* BFD a.out internal data structures */ 2659243Sobrien 2759243Sobrien#include <sys/param.h> 2859243Sobrien#include <dirent.h> 2959243Sobrien#include <signal.h> 3059243Sobrien 3159243Sobrien#include <sys/user.h> /* After a.out.h */ 3259243Sobrien 3359243Sobrien#ifdef TRAD_HEADER 3459243Sobrien#include TRAD_HEADER 3559243Sobrien#endif 36167465Smp 3759243Sobrien#ifndef NBPG 3859243Sobrien# define NBPG getpagesize() 3959243Sobrien#endif 4059243Sobrien 4159243Sobrienstruct trad_core_struct 4259243Sobrien{ 4359243Sobrien asection *data_section; 4459243Sobrien asection *stack_section; 4559243Sobrien asection *reg_section; 46167465Smp struct user u; 4759243Sobrien}; 48145479Smp 49145479Smp#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 50145479Smp#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 5159243Sobrien#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 5259243Sobrien#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 5359243Sobrien 5459243Sobrien/* forward declarations */ 5559243Sobrien 5659243Sobrien#define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 5759243Sobrien#define trad_unix_core_file_pid _bfd_nocore_core_file_pid 5859243Sobrien 5959243Sobrien 6059243Sobrien/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 6159243Sobrien 6259243Sobrienstatic bfd_cleanup 6359243Sobrientrad_unix_core_file_p (bfd *abfd) 6459243Sobrien{ 6559243Sobrien int val; 6659243Sobrien struct user u; 6759243Sobrien struct trad_core_struct *rawptr; 6859243Sobrien size_t amt; 6959243Sobrien flagword flags; 7059243Sobrien 7159243Sobrien#ifdef TRAD_CORE_USER_OFFSET 7259243Sobrien /* If defined, this macro is the file position of the user struct. */ 7359243Sobrien if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) 7459243Sobrien return 0; 7559243Sobrien#endif 7659243Sobrien 7759243Sobrien val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd); 7859243Sobrien if (val != sizeof u) 7959243Sobrien { 8059243Sobrien /* Too small to be a core file */ 8159243Sobrien bfd_set_error (bfd_error_wrong_format); 8259243Sobrien return 0; 8359243Sobrien } 8459243Sobrien 8559243Sobrien /* Sanity check perhaps??? */ 8659243Sobrien if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ 8759243Sobrien { 8859243Sobrien bfd_set_error (bfd_error_wrong_format); 8959243Sobrien return 0; 9059243Sobrien } 9159243Sobrien if (u.u_ssize > 0x1000000) 9259243Sobrien { 9359243Sobrien bfd_set_error (bfd_error_wrong_format); 9459243Sobrien return 0; 9559243Sobrien } 9659243Sobrien 9759243Sobrien /* Check that the size claimed is no greater than the file size. */ 9859243Sobrien { 9959243Sobrien struct stat statbuf; 10059243Sobrien 10159243Sobrien if (bfd_stat (abfd, &statbuf) < 0) 10259243Sobrien return 0; 10359243Sobrien 10459243Sobrien if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize 10559243Sobrien#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 10659243Sobrien - u.u_tsize 10759243Sobrien#endif 10859243Sobrien + u.u_ssize) 10959243Sobrien > (ufile_ptr) statbuf.st_size) 11059243Sobrien { 11159243Sobrien bfd_set_error (bfd_error_wrong_format); 11259243Sobrien return 0; 11359243Sobrien } 11459243Sobrien#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 11559243Sobrien if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize) 11659243Sobrien#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED 11759243Sobrien /* Some systems write the file too big. */ 11859243Sobrien + TRAD_CORE_EXTRA_SIZE_ALLOWED 11959243Sobrien#endif 12059243Sobrien ) 12159243Sobrien < (ufile_ptr) statbuf.st_size) 12259243Sobrien { 12359243Sobrien /* The file is too big. Maybe it's not a core file 12459243Sobrien or we otherwise have bad values for u_dsize and u_ssize). */ 12559243Sobrien bfd_set_error (bfd_error_wrong_format); 12659243Sobrien return 0; 12759243Sobrien } 12859243Sobrien#endif 12959243Sobrien } 13059243Sobrien 13159243Sobrien /* OK, we believe you. You're a core file (sure, sure). */ 13259243Sobrien 13359243Sobrien /* Allocate both the upage and the struct core_data at once, so 13459243Sobrien a single free() will free them both. */ 13559243Sobrien amt = sizeof (struct trad_core_struct); 13659243Sobrien rawptr = (struct trad_core_struct *) bfd_zmalloc (amt); 13759243Sobrien if (rawptr == NULL) 13859243Sobrien return 0; 13959243Sobrien 140100616Smp abfd->tdata.trad_core_data = rawptr; 141100616Smp 142100616Smp rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 143100616Smp 144100616Smp /* Create the sections. */ 14559243Sobrien 14659243Sobrien flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 14759243Sobrien core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 14859243Sobrien flags); 149167465Smp if (core_stacksec (abfd) == NULL) 150167465Smp goto fail; 151167465Smp core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 152167465Smp flags); 15359243Sobrien if (core_datasec (abfd) == NULL) 15459243Sobrien goto fail; 15559243Sobrien core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 15659243Sobrien SEC_HAS_CONTENTS); 15759243Sobrien if (core_regsec (abfd) == NULL) 15859243Sobrien goto fail; 15959243Sobrien 16059243Sobrien core_datasec (abfd)->size = NBPG * u.u_dsize 16159243Sobrien#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 162167465Smp - NBPG * u.u_tsize 163100616Smp#endif 16459243Sobrien ; 16559243Sobrien core_stacksec (abfd)->size = NBPG * u.u_ssize; 16659243Sobrien core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */ 167100616Smp 168167465Smp /* What a hack... we'd like to steal it from the exec file, 169167465Smp since the upage does not seem to provide it. FIXME. */ 170167465Smp#ifdef HOST_DATA_START_ADDR 171167465Smp core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 172167465Smp#else 173167465Smp core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 174167465Smp#endif 17559243Sobrien 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