trad-core.c revision 1.1.1.2
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, 2007, 2011, 2012 4 Free Software Foundation, Inc. 5 Written by John Gilmore of Cygnus Support. 6 7 This file is part of BFD, the Binary File Descriptor library. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 22 MA 02110-1301, USA. */ 23 24#include "sysdep.h" 25#include "bfd.h" 26#include "libbfd.h" 27#include "libaout.h" /* BFD a.out internal data structures */ 28 29#include <sys/param.h> 30#ifdef HAVE_DIRENT_H 31# include <dirent.h> 32#else 33# ifdef HAVE_SYS_NDIR_H 34# include <sys/ndir.h> 35# endif 36# ifdef HAVE_SYS_DIR_H 37# include <sys/dir.h> 38# endif 39# ifdef HAVE_NDIR_H 40# include <ndir.h> 41# endif 42#endif 43#include <signal.h> 44 45#include <sys/user.h> /* After a.out.h */ 46 47#ifdef TRAD_HEADER 48#include TRAD_HEADER 49#endif 50 51#ifndef NBPG 52# define NBPG getpagesize() 53#endif 54 55struct trad_core_struct 56{ 57 asection *data_section; 58 asection *stack_section; 59 asection *reg_section; 60 struct user u; 61}; 62 63#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 64#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 65#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 66#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 67 68/* forward declarations */ 69 70#define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 71#define trad_unix_core_file_pid _bfd_nocore_core_file_pid 72 73 74/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 75 76static const bfd_target * 77trad_unix_core_file_p (bfd *abfd) 78{ 79 int val; 80 struct user u; 81 struct trad_core_struct *rawptr; 82 bfd_size_type amt; 83 flagword flags; 84 85#ifdef TRAD_CORE_USER_OFFSET 86 /* If defined, this macro is the file position of the user struct. */ 87 if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) 88 return 0; 89#endif 90 91 val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd); 92 if (val != sizeof u) 93 { 94 /* Too small to be a core file */ 95 bfd_set_error (bfd_error_wrong_format); 96 return 0; 97 } 98 99 /* Sanity check perhaps??? */ 100 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ 101 { 102 bfd_set_error (bfd_error_wrong_format); 103 return 0; 104 } 105 if (u.u_ssize > 0x1000000) 106 { 107 bfd_set_error (bfd_error_wrong_format); 108 return 0; 109 } 110 111 /* Check that the size claimed is no greater than the file size. */ 112 { 113 struct stat statbuf; 114 115 if (bfd_stat (abfd, &statbuf) < 0) 116 return 0; 117 118 if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize 119#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 120 - u.u_tsize 121#endif 122 + u.u_ssize) 123 > (ufile_ptr) statbuf.st_size) 124 { 125 bfd_set_error (bfd_error_wrong_format); 126 return 0; 127 } 128#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 129 if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize) 130#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED 131 /* Some systems write the file too big. */ 132 + TRAD_CORE_EXTRA_SIZE_ALLOWED 133#endif 134 ) 135 < (ufile_ptr) statbuf.st_size) 136 { 137 /* The file is too big. Maybe it's not a core file 138 or we otherwise have bad values for u_dsize and u_ssize). */ 139 bfd_set_error (bfd_error_wrong_format); 140 return 0; 141 } 142#endif 143 } 144 145 /* OK, we believe you. You're a core file (sure, sure). */ 146 147 /* Allocate both the upage and the struct core_data at once, so 148 a single free() will free them both. */ 149 amt = sizeof (struct trad_core_struct); 150 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt); 151 if (rawptr == NULL) 152 return 0; 153 154 abfd->tdata.trad_core_data = rawptr; 155 156 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 157 158 /* Create the sections. */ 159 160 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 161 core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 162 flags); 163 if (core_stacksec (abfd) == NULL) 164 goto fail; 165 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 166 flags); 167 if (core_datasec (abfd) == NULL) 168 goto fail; 169 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 170 SEC_HAS_CONTENTS); 171 if (core_regsec (abfd) == NULL) 172 goto fail; 173 174 core_datasec (abfd)->size = NBPG * u.u_dsize 175#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 176 - NBPG * u.u_tsize 177#endif 178 ; 179 core_stacksec (abfd)->size = NBPG * u.u_ssize; 180 core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */ 181 182 /* What a hack... we'd like to steal it from the exec file, 183 since the upage does not seem to provide it. FIXME. */ 184#ifdef HOST_DATA_START_ADDR 185 core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 186#else 187 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 188#endif 189 190#ifdef HOST_STACK_START_ADDR 191 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; 192#else 193 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); 194#endif 195 196 /* This is tricky. As the "register section", we give them the entire 197 upage and stack. u.u_ar0 points to where "register 0" is stored. 198 There are two tricks with this, though. One is that the rest of the 199 registers might be at positive or negative (or both) displacements 200 from *u_ar0. The other is that u_ar0 is sometimes an absolute address 201 in kernel memory, and on other systems it is an offset from the beginning 202 of the `struct user'. 203 204 As a practical matter, we don't know where the registers actually are, 205 so we have to pass the whole area to GDB. We encode the value of u_ar0 206 by setting the .regs section up so that its virtual memory address 207 0 is at the place pointed to by u_ar0 (by setting the vma of the start 208 of the section to -u_ar0). GDB uses this info to locate the regs, 209 using minor trickery to get around the offset-or-absolute-addr problem. */ 210 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0; 211 212 core_datasec (abfd)->filepos = NBPG * UPAGES; 213 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize 214#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 215 - NBPG * u.u_tsize 216#endif 217 ; 218 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ 219 220 /* Align to word at least */ 221 core_stacksec (abfd)->alignment_power = 2; 222 core_datasec (abfd)->alignment_power = 2; 223 core_regsec (abfd)->alignment_power = 2; 224 225 return abfd->xvec; 226 227 fail: 228 bfd_release (abfd, abfd->tdata.any); 229 abfd->tdata.any = NULL; 230 bfd_section_list_clear (abfd); 231 return NULL; 232} 233 234static char * 235trad_unix_core_file_failing_command (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 246static int 247trad_unix_core_file_failing_signal (bfd *ignore_abfd ATTRIBUTE_UNUSED) 248{ 249#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL 250 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); 251#else 252 return -1; /* FIXME, where is it? */ 253#endif 254} 255 256/* If somebody calls any byte-swapping routines, shoot them. */ 257static void 258swap_abort (void) 259{ 260 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 261} 262 263#define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 264#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 265#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 266#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 267#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 268#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 269 270const bfd_target trad_core_vec = 271 { 272 "trad-core", 273 bfd_target_unknown_flavour, 274 BFD_ENDIAN_UNKNOWN, /* target byte order */ 275 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 276 (HAS_RELOC | EXEC_P | /* object flags */ 277 HAS_LINENO | HAS_DEBUG | 278 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 279 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 280 0, /* symbol prefix */ 281 ' ', /* ar_pad_char */ 282 16, /* ar_max_namelen */ 283 0, /* match priority. */ 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 NULL /* backend_data */ 319 }; 320