trad-core.c revision 60484
1/* BFD back end for traditional Unix core files (U-area and raw sections) 2 Copyright 1988, 89, 91, 92, 93, 94, 95, 96, 98, 99, 2000 3 Free Software Foundation, Inc. 4 Written by John Gilmore of Cygnus Support. 5 6This file is part of BFD, the Binary File Descriptor library. 7 8This program is free software; you can redistribute it and/or modify 9it under the terms of the GNU General Public License as published by 10the Free Software Foundation; either version 2 of the License, or 11(at your option) any later version. 12 13This program is distributed in the hope that it will be useful, 14but WITHOUT ANY WARRANTY; without even the implied warranty of 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16GNU General Public License for more details. 17 18You should have received a copy of the GNU General Public License 19along with this program; if not, write to the Free Software 20Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 21 22#include "bfd.h" 23#include "sysdep.h" 24#include "libbfd.h" 25#include "libaout.h" /* BFD a.out internal data structures */ 26 27#include <sys/param.h> 28#include <sys/dir.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 struct trad_core_struct 38 { 39 asection *data_section; 40 asection *stack_section; 41 asection *reg_section; 42 struct user u; 43 }; 44 45#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 46#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 47#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 48#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 49 50/* forward declarations */ 51 52const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd)); 53char * trad_unix_core_file_failing_command PARAMS ((bfd *abfd)); 54int trad_unix_core_file_failing_signal PARAMS ((bfd *abfd)); 55boolean trad_unix_core_file_matches_executable_p 56 PARAMS ((bfd *core_bfd, bfd *exec_bfd)); 57static void swap_abort PARAMS ((void)); 58 59/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 60 61/* ARGSUSED */ 62const bfd_target * 63trad_unix_core_file_p (abfd) 64 bfd *abfd; 65 66{ 67 int val; 68 struct user u; 69 struct trad_core_struct *rawptr; 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, TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) 74 return 0; 75#endif 76 77 val = bfd_read ((void *)&u, 1, 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 FILE *stream = bfd_cache_lookup (abfd); 100 struct stat statbuf; 101 if (stream == NULL) 102 return 0; 103 if (fstat (fileno (stream), &statbuf) < 0) 104 { 105 bfd_set_error (bfd_error_system_call); 106 return 0; 107 } 108 if ((unsigned long) (NBPG * (UPAGES + u.u_dsize 109#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 110 - u.u_tsize 111#endif 112 + u.u_ssize)) 113 > (unsigned long) statbuf.st_size) 114 { 115 bfd_set_error (bfd_error_wrong_format); 116 return 0; 117 } 118#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 119 if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize) 120#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED 121 /* Some systems write the file too big. */ 122 + TRAD_CORE_EXTRA_SIZE_ALLOWED 123#endif 124 ) 125 < (unsigned long) statbuf.st_size) 126 { 127 /* The file is too big. Maybe it's not a core file 128 or we otherwise have bad values for u_dsize and u_ssize). */ 129 bfd_set_error (bfd_error_wrong_format); 130 return 0; 131 } 132#endif 133 } 134 135 /* OK, we believe you. You're a core file (sure, sure). */ 136 137 /* Allocate both the upage and the struct core_data at once, so 138 a single free() will free them both. */ 139 rawptr = (struct trad_core_struct *) 140 bfd_zmalloc (sizeof (struct trad_core_struct)); 141 if (rawptr == NULL) 142 return 0; 143 144 abfd->tdata.trad_core_data = rawptr; 145 146 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 147 148 /* Create the sections. This is raunchy, but bfd_close wants to free 149 them separately. */ 150 151 core_stacksec(abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 152 if (core_stacksec (abfd) == NULL) 153 return NULL; 154 core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 155 if (core_datasec (abfd) == NULL) 156 return NULL; 157 core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 158 if (core_regsec (abfd) == NULL) 159 return NULL; 160 161 core_stacksec (abfd)->name = ".stack"; 162 core_datasec (abfd)->name = ".data"; 163 core_regsec (abfd)->name = ".reg"; 164 165 core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 166 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 167 core_regsec (abfd)->flags = SEC_HAS_CONTENTS; 168 169 core_datasec (abfd)->_raw_size = NBPG * u.u_dsize 170#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 171 - NBPG * u.u_tsize 172#endif 173 ; 174 core_stacksec (abfd)->_raw_size = NBPG * u.u_ssize; 175 core_regsec (abfd)->_raw_size = NBPG * UPAGES; /* Larger than sizeof struct u */ 176 177 /* What a hack... we'd like to steal it from the exec file, 178 since the upage does not seem to provide it. FIXME. */ 179#ifdef HOST_DATA_START_ADDR 180 core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 181#else 182 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 183#endif 184 185#ifdef HOST_STACK_START_ADDR 186 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; 187#else 188 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); 189#endif 190 191 /* This is tricky. As the "register section", we give them the entire 192 upage and stack. u.u_ar0 points to where "register 0" is stored. 193 There are two tricks with this, though. One is that the rest of the 194 registers might be at positive or negative (or both) displacements 195 from *u_ar0. The other is that u_ar0 is sometimes an absolute address 196 in kernel memory, and on other systems it is an offset from the beginning 197 of the `struct user'. 198 199 As a practical matter, we don't know where the registers actually are, 200 so we have to pass the whole area to GDB. We encode the value of u_ar0 201 by setting the .regs section up so that its virtual memory address 202 0 is at the place pointed to by u_ar0 (by setting the vma of the start 203 of the section to -u_ar0). GDB uses this info to locate the regs, 204 using minor trickery to get around the offset-or-absolute-addr problem. */ 205 core_regsec (abfd)->vma = - (bfd_vma) u.u_ar0; 206 207 core_datasec (abfd)->filepos = NBPG * UPAGES; 208 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize 209#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 210 - NBPG * u.u_tsize 211#endif 212 ; 213 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ 214 215 /* Align to word at least */ 216 core_stacksec (abfd)->alignment_power = 2; 217 core_datasec (abfd)->alignment_power = 2; 218 core_regsec (abfd)->alignment_power = 2; 219 220 abfd->sections = core_stacksec (abfd); 221 core_stacksec (abfd)->next = core_datasec (abfd); 222 core_datasec (abfd)->next = core_regsec (abfd); 223 abfd->section_count = 3; 224 225 return abfd->xvec; 226} 227 228char * 229trad_unix_core_file_failing_command (abfd) 230 bfd *abfd; 231{ 232#ifndef NO_CORE_COMMAND 233 char *com = abfd->tdata.trad_core_data->u.u_comm; 234 if (*com) 235 return com; 236 else 237#endif 238 return 0; 239} 240 241/* ARGSUSED */ 242int 243trad_unix_core_file_failing_signal (ignore_abfd) 244 bfd *ignore_abfd ATTRIBUTE_UNUSED; 245{ 246#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL 247 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); 248#else 249 return -1; /* FIXME, where is it? */ 250#endif 251} 252 253/* ARGSUSED */ 254boolean 255trad_unix_core_file_matches_executable_p (core_bfd, exec_bfd) 256 bfd *core_bfd ATTRIBUTE_UNUSED; 257 bfd *exec_bfd ATTRIBUTE_UNUSED; 258{ 259 return true; /* FIXME, We have no way of telling at this point */ 260} 261 262/* If somebody calls any byte-swapping routines, shoot them. */ 263static void 264swap_abort() 265{ 266 abort(); /* This way doesn't require any declaration for ANSI to fuck up */ 267} 268#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort ) 269#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort ) 270#define NO_SIGNED_GET \ 271 ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort ) 272 273const bfd_target trad_core_vec = 274 { 275 "trad-core", 276 bfd_target_unknown_flavour, 277 BFD_ENDIAN_UNKNOWN, /* target byte order */ 278 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 279 (HAS_RELOC | EXEC_P | /* object flags */ 280 HAS_LINENO | HAS_DEBUG | 281 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 282 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 283 0, /* symbol prefix */ 284 ' ', /* ar_pad_char */ 285 16, /* ar_max_namelen */ 286 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */ 287 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */ 288 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */ 289 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */ 290 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */ 291 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */ 292 293 { /* bfd_check_format */ 294 _bfd_dummy_target, /* unknown format */ 295 _bfd_dummy_target, /* object file */ 296 _bfd_dummy_target, /* archive */ 297 trad_unix_core_file_p /* a core file */ 298 }, 299 { /* bfd_set_format */ 300 bfd_false, bfd_false, 301 bfd_false, bfd_false 302 }, 303 { /* bfd_write_contents */ 304 bfd_false, bfd_false, 305 bfd_false, bfd_false 306 }, 307 308 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 309 BFD_JUMP_TABLE_COPY (_bfd_generic), 310 BFD_JUMP_TABLE_CORE (trad_unix), 311 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 312 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 313 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 314 BFD_JUMP_TABLE_WRITE (_bfd_generic), 315 BFD_JUMP_TABLE_LINK (_bfd_nolink), 316 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 317 318 NULL, 319 320 (PTR) 0 /* backend_data */ 321}; 322