trad-core.c revision 33965
1/* BFD back end for traditional Unix core files (U-area and raw sections) 2 Copyright 1988, 1989, 1991, 1992, 1993, 1994 Free Software Foundation, Inc. 3 Written by John Gilmore of Cygnus Support. 4 5This file is part of BFD, the Binary File Descriptor library. 6 7This program is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2 of the License, or 10(at your option) any later version. 11 12This program is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with this program; if not, write to the Free Software 19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21#include "bfd.h" 22#include "sysdep.h" 23#include "libbfd.h" 24#include "libaout.h" /* BFD a.out internal data structures */ 25 26#include <stdio.h> 27#include <sys/types.h> 28#include <sys/param.h> 29#include <sys/dir.h> 30#include <signal.h> 31 32#include <sys/user.h> /* After a.out.h */ 33 34#ifdef TRAD_HEADER 35#include TRAD_HEADER 36#endif 37 38 struct trad_core_struct 39 { 40 asection *data_section; 41 asection *stack_section; 42 asection *reg_section; 43 struct user u; 44 }; 45 46#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 47#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 48#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 49#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 50 51/* forward declarations */ 52 53const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd)); 54char * trad_unix_core_file_failing_command PARAMS ((bfd *abfd)); 55int trad_unix_core_file_failing_signal PARAMS ((bfd *abfd)); 56boolean trad_unix_core_file_matches_executable_p 57 PARAMS ((bfd *core_bfd, bfd *exec_bfd)); 58static void swap_abort PARAMS ((void)); 59 60/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 61 62/* ARGSUSED */ 63const bfd_target * 64trad_unix_core_file_p (abfd) 65 bfd *abfd; 66 67{ 68 int val; 69 struct user u; 70 struct trad_core_struct *rawptr; 71 72#ifdef TRAD_CORE_USER_OFFSET 73 /* If defined, this macro is the file position of the user struct. */ 74 if (bfd_seek (abfd, TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) 75 return 0; 76#endif 77 78 val = bfd_read ((void *)&u, 1, sizeof u, abfd); 79 if (val != sizeof u) 80 { 81 /* Too small to be a core file */ 82 bfd_set_error (bfd_error_wrong_format); 83 return 0; 84 } 85 86 /* Sanity check perhaps??? */ 87 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ 88 { 89 bfd_set_error (bfd_error_wrong_format); 90 return 0; 91 } 92 if (u.u_ssize > 0x1000000) 93 { 94 bfd_set_error (bfd_error_wrong_format); 95 return 0; 96 } 97 98 /* Check that the size claimed is no greater than the file size. */ 99 { 100 FILE *stream = bfd_cache_lookup (abfd); 101 struct stat statbuf; 102 if (stream == NULL) 103 return 0; 104 if (fstat (fileno (stream), &statbuf) < 0) 105 { 106 bfd_set_error (bfd_error_system_call); 107 return 0; 108 } 109 if (NBPG * (UPAGES + u.u_dsize 110#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 111 - u.u_tsize 112#endif 113 + u.u_ssize) > statbuf.st_size) 114 { 115 bfd_set_error (bfd_error_file_truncated); 116 return 0; 117 } 118#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 119 if (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 < statbuf.st_size) 125 { 126 /* The file is too big. Maybe it's not a core file 127 or we otherwise have bad values for u_dsize and u_ssize). */ 128 bfd_set_error (bfd_error_wrong_format); 129 return 0; 130 } 131#endif 132 } 133 134 /* OK, we believe you. You're a core file (sure, sure). */ 135 136 /* Allocate both the upage and the struct core_data at once, so 137 a single free() will free them both. */ 138 rawptr = (struct trad_core_struct *) 139 bfd_zmalloc (sizeof (struct trad_core_struct)); 140 if (rawptr == NULL) 141 return 0; 142 143 abfd->tdata.trad_core_data = rawptr; 144 145 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 146 147 /* Create the sections. This is raunchy, but bfd_close wants to free 148 them separately. */ 149 150 core_stacksec(abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 151 if (core_stacksec (abfd) == NULL) 152 return NULL; 153 core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 154 if (core_datasec (abfd) == NULL) 155 return NULL; 156 core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 157 if (core_regsec (abfd) == NULL) 158 return NULL; 159 160 core_stacksec (abfd)->name = ".stack"; 161 core_datasec (abfd)->name = ".data"; 162 core_regsec (abfd)->name = ".reg"; 163 164 core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 165 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 166 core_regsec (abfd)->flags = SEC_HAS_CONTENTS; 167 168 core_datasec (abfd)->_raw_size = NBPG * u.u_dsize 169#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 170 - NBPG * u.u_tsize 171#endif 172 ; 173 core_stacksec (abfd)->_raw_size = NBPG * u.u_ssize; 174 core_regsec (abfd)->_raw_size = NBPG * UPAGES; /* Larger than sizeof struct u */ 175 176 /* What a hack... we'd like to steal it from the exec file, 177 since the upage does not seem to provide it. FIXME. */ 178#ifdef HOST_DATA_START_ADDR 179 core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 180#else 181 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 182#endif 183 184#ifdef HOST_STACK_START_ADDR 185 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; 186#else 187 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); 188#endif 189 190 /* This is tricky. As the "register section", we give them the entire 191 upage and stack. u.u_ar0 points to where "register 0" is stored. 192 There are two tricks with this, though. One is that the rest of the 193 registers might be at positive or negative (or both) displacements 194 from *u_ar0. The other is that u_ar0 is sometimes an absolute address 195 in kernel memory, and on other systems it is an offset from the beginning 196 of the `struct user'. 197 198 As a practical matter, we don't know where the registers actually are, 199 so we have to pass the whole area to GDB. We encode the value of u_ar0 200 by setting the .regs section up so that its virtual memory address 201 0 is at the place pointed to by u_ar0 (by setting the vma of the start 202 of the section to -u_ar0). GDB uses this info to locate the regs, 203 using minor trickery to get around the offset-or-absolute-addr problem. */ 204 core_regsec (abfd)->vma = 0 - (bfd_vma) u.u_ar0; 205 206 core_datasec (abfd)->filepos = NBPG * UPAGES; 207 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize 208#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 209 - NBPG * u.u_tsize 210#endif 211 ; 212 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ 213 214 /* Align to word at least */ 215 core_stacksec (abfd)->alignment_power = 2; 216 core_datasec (abfd)->alignment_power = 2; 217 core_regsec (abfd)->alignment_power = 2; 218 219 abfd->sections = core_stacksec (abfd); 220 core_stacksec (abfd)->next = core_datasec (abfd); 221 core_datasec (abfd)->next = core_regsec (abfd); 222 abfd->section_count = 3; 223 224 return abfd->xvec; 225} 226 227char * 228trad_unix_core_file_failing_command (abfd) 229 bfd *abfd; 230{ 231#ifndef NO_CORE_COMMAND 232 char *com = abfd->tdata.trad_core_data->u.u_comm; 233 if (*com) 234 return com; 235 else 236#endif 237 return 0; 238} 239 240/* ARGSUSED */ 241int 242trad_unix_core_file_failing_signal (ignore_abfd) 243 bfd *ignore_abfd; 244{ 245#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL 246 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); 247#else 248 return -1; /* FIXME, where is it? */ 249#endif 250} 251 252/* ARGSUSED */ 253boolean 254trad_unix_core_file_matches_executable_p (core_bfd, exec_bfd) 255 bfd *core_bfd, *exec_bfd; 256{ 257 return true; /* FIXME, We have no way of telling at this point */ 258} 259 260/* If somebody calls any byte-swapping routines, shoot them. */ 261static void 262swap_abort() 263{ 264 abort(); /* This way doesn't require any declaration for ANSI to fuck up */ 265} 266#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort ) 267#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort ) 268#define NO_SIGNED_GET \ 269 ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) 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_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */ 285 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */ 286 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */ 287 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */ 288 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */ 289 NO_GET, NO_SIGNED_GET, 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 (PTR) 0 /* backend_data */ 317}; 318