1/* BFD back end for traditional Unix core files (U-area and raw sections) 2 Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 3 2000, 2001, 2002, 2003, 2004, 2005, 2006 4 Free Software Foundation, Inc. 5 Written by John Gilmore of Cygnus Support. 6 7This file is part of BFD, the Binary File Descriptor library. 8 9This program is free software; you can redistribute it and/or modify 10it under the terms of the GNU General Public License as published by 11the Free Software Foundation; either version 2 of the License, or 12(at your option) any later version. 13 14This program is distributed in the hope that it will be useful, 15but WITHOUT ANY WARRANTY; without even the implied warranty of 16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17GNU General Public License for more details. 18 19You should have received a copy of the GNU General Public License 20along with this program; if not, write to the Free Software 21Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23#include "bfd.h" 24#include "sysdep.h" 25#include "libbfd.h" 26#include "libaout.h" /* BFD a.out internal data structures */ 27 28#include <sys/param.h> 29#ifdef HAVE_DIRENT_H 30# include <dirent.h> 31#else 32# ifdef HAVE_SYS_NDIR_H 33# include <sys/ndir.h> 34# endif 35# ifdef HAVE_SYS_DIR_H 36# include <sys/dir.h> 37# endif 38# ifdef HAVE_NDIR_H 39# include <ndir.h> 40# endif 41#endif 42#include <signal.h> 43 44#include <sys/user.h> /* After a.out.h */ 45 46#ifdef TRAD_HEADER 47#include TRAD_HEADER 48#endif 49 50struct trad_core_struct 51{ 52 asection *data_section; 53 asection *stack_section; 54 asection *reg_section; 55 struct user u; 56}; 57 58#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 59#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 60#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 61#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 62 63/* forward declarations */ 64 65const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd)); 66char * trad_unix_core_file_failing_command PARAMS ((bfd *abfd)); 67int trad_unix_core_file_failing_signal PARAMS ((bfd *abfd)); 68#define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 69static void swap_abort PARAMS ((void)); 70 71/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 72 73const bfd_target * 74trad_unix_core_file_p (abfd) 75 bfd *abfd; 76 77{ 78 int val; 79 struct user u; 80 struct trad_core_struct *rawptr; 81 bfd_size_type amt; 82 flagword flags; 83 84#ifdef TRAD_CORE_USER_OFFSET 85 /* If defined, this macro is the file position of the user struct. */ 86 if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) 87 return 0; 88#endif 89 90 val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd); 91 if (val != sizeof u) 92 { 93 /* Too small to be a core file */ 94 bfd_set_error (bfd_error_wrong_format); 95 return 0; 96 } 97 98 /* Sanity check perhaps??? */ 99 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ 100 { 101 bfd_set_error (bfd_error_wrong_format); 102 return 0; 103 } 104 if (u.u_ssize > 0x1000000) 105 { 106 bfd_set_error (bfd_error_wrong_format); 107 return 0; 108 } 109 110 /* Check that the size claimed is no greater than the file size. */ 111 { 112 struct stat statbuf; 113 114 if (bfd_stat (abfd, &statbuf) < 0) 115 return 0; 116 117 if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize 118#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 119 - u.u_tsize 120#endif 121 + u.u_ssize) 122 > (ufile_ptr) statbuf.st_size) 123 { 124 bfd_set_error (bfd_error_wrong_format); 125 return 0; 126 } 127#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 128 if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize) 129#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED 130 /* Some systems write the file too big. */ 131 + TRAD_CORE_EXTRA_SIZE_ALLOWED 132#endif 133 ) 134 < (ufile_ptr) statbuf.st_size) 135 { 136 /* The file is too big. Maybe it's not a core file 137 or we otherwise have bad values for u_dsize and u_ssize). */ 138 bfd_set_error (bfd_error_wrong_format); 139 return 0; 140 } 141#endif 142 } 143 144 /* OK, we believe you. You're a core file (sure, sure). */ 145 146 /* Allocate both the upage and the struct core_data at once, so 147 a single free() will free them both. */ 148 amt = sizeof (struct trad_core_struct); 149 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt); 150 if (rawptr == NULL) 151 return 0; 152 153 abfd->tdata.trad_core_data = rawptr; 154 155 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 156 157 /* Create the sections. */ 158 159 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 160 core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 161 flags); 162 if (core_stacksec (abfd) == NULL) 163 goto fail; 164 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 165 flags); 166 if (core_datasec (abfd) == NULL) 167 goto fail; 168 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 169 SEC_HAS_CONTENTS); 170 if (core_regsec (abfd) == NULL) 171 goto fail; 172 173 core_datasec (abfd)->size = NBPG * u.u_dsize 174#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 175 - NBPG * u.u_tsize 176#endif 177 ; 178 core_stacksec (abfd)->size = NBPG * u.u_ssize; 179 core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */ 180 181 /* What a hack... we'd like to steal it from the exec file, 182 since the upage does not seem to provide it. FIXME. */ 183#ifdef HOST_DATA_START_ADDR 184 core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 185#else 186 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 187#endif 188 189#ifdef HOST_STACK_START_ADDR 190 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; 191#else 192 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); 193#endif 194 195 /* This is tricky. As the "register section", we give them the entire 196 upage and stack. u.u_ar0 points to where "register 0" is stored. 197 There are two tricks with this, though. One is that the rest of the 198 registers might be at positive or negative (or both) displacements 199 from *u_ar0. The other is that u_ar0 is sometimes an absolute address 200 in kernel memory, and on other systems it is an offset from the beginning 201 of the `struct user'. 202 203 As a practical matter, we don't know where the registers actually are, 204 so we have to pass the whole area to GDB. We encode the value of u_ar0 205 by setting the .regs section up so that its virtual memory address 206 0 is at the place pointed to by u_ar0 (by setting the vma of the start 207 of the section to -u_ar0). GDB uses this info to locate the regs, 208 using minor trickery to get around the offset-or-absolute-addr problem. */ 209 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0; 210 211 core_datasec (abfd)->filepos = NBPG * UPAGES; 212 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize 213#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 214 - NBPG * u.u_tsize 215#endif 216 ; 217 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ 218 219 /* Align to word at least */ 220 core_stacksec (abfd)->alignment_power = 2; 221 core_datasec (abfd)->alignment_power = 2; 222 core_regsec (abfd)->alignment_power = 2; 223 224 return abfd->xvec; 225 226 fail: 227 bfd_release (abfd, abfd->tdata.any); 228 abfd->tdata.any = NULL; 229 bfd_section_list_clear (abfd); 230 return NULL; 231} 232 233char * 234trad_unix_core_file_failing_command (abfd) 235 bfd *abfd; 236{ 237#ifndef NO_CORE_COMMAND 238 char *com = abfd->tdata.trad_core_data->u.u_comm; 239 if (*com) 240 return com; 241 else 242#endif 243 return 0; 244} 245 246int 247trad_unix_core_file_failing_signal (ignore_abfd) 248 bfd *ignore_abfd ATTRIBUTE_UNUSED; 249{ 250#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL 251 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); 252#else 253 return -1; /* FIXME, where is it? */ 254#endif 255} 256 257/* If somebody calls any byte-swapping routines, shoot them. */ 258static void 259swap_abort () 260{ 261 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 262} 263 264#define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 265#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 266#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 267#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 268#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 269#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 270 271const bfd_target trad_core_vec = 272 { 273 "trad-core", 274 bfd_target_unknown_flavour, 275 BFD_ENDIAN_UNKNOWN, /* target byte order */ 276 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 277 (HAS_RELOC | EXEC_P | /* object flags */ 278 HAS_LINENO | HAS_DEBUG | 279 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 280 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 281 0, /* symbol prefix */ 282 ' ', /* ar_pad_char */ 283 16, /* ar_max_namelen */ 284 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 285 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 286 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 287 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 288 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 289 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 290 291 { /* bfd_check_format */ 292 _bfd_dummy_target, /* unknown format */ 293 _bfd_dummy_target, /* object file */ 294 _bfd_dummy_target, /* archive */ 295 trad_unix_core_file_p /* a core file */ 296 }, 297 { /* bfd_set_format */ 298 bfd_false, bfd_false, 299 bfd_false, bfd_false 300 }, 301 { /* bfd_write_contents */ 302 bfd_false, bfd_false, 303 bfd_false, bfd_false 304 }, 305 306 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 307 BFD_JUMP_TABLE_COPY (_bfd_generic), 308 BFD_JUMP_TABLE_CORE (trad_unix), 309 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 310 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 311 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 312 BFD_JUMP_TABLE_WRITE (_bfd_generic), 313 BFD_JUMP_TABLE_LINK (_bfd_nolink), 314 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 315 316 NULL, 317 318 (PTR) 0 /* backend_data */ 319 }; 320