trad-core.c revision 91041
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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 50 struct 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)); 68boolean trad_unix_core_file_matches_executable_p 69 PARAMS ((bfd *core_bfd, bfd *exec_bfd)); 70static void swap_abort PARAMS ((void)); 71 72/* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ 73 74/* ARGSUSED */ 75const bfd_target * 76trad_unix_core_file_p (abfd) 77 bfd *abfd; 78 79{ 80 int val; 81 struct user u; 82 struct trad_core_struct *rawptr; 83 bfd_size_type amt; 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 FILE *stream = bfd_cache_lookup (abfd); 114 struct stat statbuf; 115 if (stream == NULL) 116 return 0; 117 if (fstat (fileno (stream), &statbuf) < 0) 118 { 119 bfd_set_error (bfd_error_system_call); 120 return 0; 121 } 122 if ((unsigned long) (NBPG * (UPAGES + u.u_dsize 123#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 124 - u.u_tsize 125#endif 126 + u.u_ssize)) 127 > (unsigned long) statbuf.st_size) 128 { 129 bfd_set_error (bfd_error_wrong_format); 130 return 0; 131 } 132#ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE 133 if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize) 134#ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED 135 /* Some systems write the file too big. */ 136 + TRAD_CORE_EXTRA_SIZE_ALLOWED 137#endif 138 ) 139 < (unsigned long) statbuf.st_size) 140 { 141 /* The file is too big. Maybe it's not a core file 142 or we otherwise have bad values for u_dsize and u_ssize). */ 143 bfd_set_error (bfd_error_wrong_format); 144 return 0; 145 } 146#endif 147 } 148 149 /* OK, we believe you. You're a core file (sure, sure). */ 150 151 /* Allocate both the upage and the struct core_data at once, so 152 a single free() will free them both. */ 153 amt = sizeof (struct trad_core_struct); 154 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt); 155 if (rawptr == NULL) 156 return 0; 157 158 abfd->tdata.trad_core_data = rawptr; 159 160 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 161 162 /* Create the sections. */ 163 164 core_stacksec(abfd) = bfd_make_section_anyway (abfd, ".stack"); 165 if (core_stacksec (abfd) == NULL) 166 goto fail; 167 core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data"); 168 if (core_datasec (abfd) == NULL) 169 goto fail; 170 core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg"); 171 if (core_regsec (abfd) == NULL) 172 goto fail; 173 174 core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 175 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 176 core_regsec (abfd)->flags = SEC_HAS_CONTENTS; 177 178 core_datasec (abfd)->_raw_size = NBPG * u.u_dsize 179#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 180 - NBPG * u.u_tsize 181#endif 182 ; 183 core_stacksec (abfd)->_raw_size = NBPG * u.u_ssize; 184 core_regsec (abfd)->_raw_size = NBPG * UPAGES; /* Larger than sizeof struct u */ 185 186 /* What a hack... we'd like to steal it from the exec file, 187 since the upage does not seem to provide it. FIXME. */ 188#ifdef HOST_DATA_START_ADDR 189 core_datasec (abfd)->vma = HOST_DATA_START_ADDR; 190#else 191 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); 192#endif 193 194#ifdef HOST_STACK_START_ADDR 195 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; 196#else 197 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); 198#endif 199 200 /* This is tricky. As the "register section", we give them the entire 201 upage and stack. u.u_ar0 points to where "register 0" is stored. 202 There are two tricks with this, though. One is that the rest of the 203 registers might be at positive or negative (or both) displacements 204 from *u_ar0. The other is that u_ar0 is sometimes an absolute address 205 in kernel memory, and on other systems it is an offset from the beginning 206 of the `struct user'. 207 208 As a practical matter, we don't know where the registers actually are, 209 so we have to pass the whole area to GDB. We encode the value of u_ar0 210 by setting the .regs section up so that its virtual memory address 211 0 is at the place pointed to by u_ar0 (by setting the vma of the start 212 of the section to -u_ar0). GDB uses this info to locate the regs, 213 using minor trickery to get around the offset-or-absolute-addr problem. */ 214 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0; 215 216 core_datasec (abfd)->filepos = NBPG * UPAGES; 217 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize 218#ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE 219 - NBPG * u.u_tsize 220#endif 221 ; 222 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ 223 224 /* Align to word at least */ 225 core_stacksec (abfd)->alignment_power = 2; 226 core_datasec (abfd)->alignment_power = 2; 227 core_regsec (abfd)->alignment_power = 2; 228 229 return abfd->xvec; 230 231 fail: 232 bfd_release (abfd, abfd->tdata.any); 233 abfd->tdata.any = NULL; 234 bfd_section_list_clear (abfd); 235 return NULL; 236} 237 238char * 239trad_unix_core_file_failing_command (abfd) 240 bfd *abfd; 241{ 242#ifndef NO_CORE_COMMAND 243 char *com = abfd->tdata.trad_core_data->u.u_comm; 244 if (*com) 245 return com; 246 else 247#endif 248 return 0; 249} 250 251/* ARGSUSED */ 252int 253trad_unix_core_file_failing_signal (ignore_abfd) 254 bfd *ignore_abfd ATTRIBUTE_UNUSED; 255{ 256#ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL 257 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); 258#else 259 return -1; /* FIXME, where is it? */ 260#endif 261} 262 263/* ARGSUSED */ 264boolean 265trad_unix_core_file_matches_executable_p (core_bfd, exec_bfd) 266 bfd *core_bfd ATTRIBUTE_UNUSED; 267 bfd *exec_bfd ATTRIBUTE_UNUSED; 268{ 269 return true; /* FIXME, We have no way of telling at this point */ 270} 271 272/* If somebody calls any byte-swapping routines, shoot them. */ 273static void 274swap_abort () 275{ 276 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 277} 278#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort ) 279#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort ) 280#define NO_SIGNED_GET \ 281 ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort ) 282 283const bfd_target trad_core_vec = 284 { 285 "trad-core", 286 bfd_target_unknown_flavour, 287 BFD_ENDIAN_UNKNOWN, /* target byte order */ 288 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 289 (HAS_RELOC | EXEC_P | /* object flags */ 290 HAS_LINENO | HAS_DEBUG | 291 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 292 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 293 0, /* symbol prefix */ 294 ' ', /* ar_pad_char */ 295 16, /* ar_max_namelen */ 296 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */ 297 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */ 298 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */ 299 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */ 300 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */ 301 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */ 302 303 { /* bfd_check_format */ 304 _bfd_dummy_target, /* unknown format */ 305 _bfd_dummy_target, /* object file */ 306 _bfd_dummy_target, /* archive */ 307 trad_unix_core_file_p /* a core file */ 308 }, 309 { /* bfd_set_format */ 310 bfd_false, bfd_false, 311 bfd_false, bfd_false 312 }, 313 { /* bfd_write_contents */ 314 bfd_false, bfd_false, 315 bfd_false, bfd_false 316 }, 317 318 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 319 BFD_JUMP_TABLE_COPY (_bfd_generic), 320 BFD_JUMP_TABLE_CORE (trad_unix), 321 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 322 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 323 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 324 BFD_JUMP_TABLE_WRITE (_bfd_generic), 325 BFD_JUMP_TABLE_LINK (_bfd_nolink), 326 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 327 328 NULL, 329 330 (PTR) 0 /* backend_data */ 331}; 332