1/* BFD back end for SCO5 core files (U-area and raw sections) 2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 3 Free Software Foundation, Inc. 4 Written by Jouke Numan <jnuman@hiscom.nl> 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 21 22#include "sysdep.h" 23#include "bfd.h" 24#include "libbfd.h" 25#include "libaout.h" /* BFD a.out internal data structures */ 26 27#include <stdio.h> 28#include <sys/types.h> 29#include <sys/param.h> 30#include <sys/dir.h> 31#include <signal.h> 32 33#include <sys/user.h> /* After a.out.h */ 34#ifdef SCO5_CORE 35#include <sys/paccess.h> 36#include <sys/region.h> 37#endif 38 39struct sco5_core_struct 40{ 41 struct user u; 42}; 43 44/* forward declarations */ 45 46static asection *make_bfd_asection 47 PARAMS ((bfd *, const char *, flagword, bfd_size_type, bfd_vma, file_ptr)); 48static struct user *read_uarea PARAMS ((bfd *, int)); 49const bfd_target *sco5_core_file_p PARAMS ((bfd *abfd)); 50char *sco5_core_file_failing_command PARAMS ((bfd *abfd)); 51int sco5_core_file_failing_signal PARAMS ((bfd *abfd)); 52#define sco5_core_file_matches_executable_p generic_core_file_matches_executable_p 53static void swap_abort PARAMS ((void)); 54 55static asection * 56make_bfd_asection (abfd, name, flags, size, vma, filepos) 57 bfd *abfd; 58 const char *name; 59 flagword flags; 60 bfd_size_type size; 61 bfd_vma vma; 62 file_ptr filepos; 63{ 64 asection *asect; 65 66 asect = bfd_make_section_anyway_with_flags (abfd, name, flags); 67 if (!asect) 68 return NULL; 69 asect->size = size; 70 asect->vma = vma; 71 asect->filepos = filepos; 72 asect->alignment_power = 2; 73 74 return asect; 75} 76 77static struct user * 78read_uarea(abfd, filepos) 79 bfd *abfd; 80 int filepos; 81 82{ 83 struct sco5_core_struct *rawptr; 84 bfd_size_type amt = sizeof (struct sco5_core_struct); 85 86 rawptr = (struct sco5_core_struct *) bfd_zmalloc (amt); 87 if (rawptr == NULL) 88 return NULL; 89 90 abfd->tdata.sco5_core_data = rawptr; 91 92 if (bfd_seek (abfd, (file_ptr) filepos, SEEK_SET) != 0 93 || bfd_bread ((void *) &rawptr->u, (bfd_size_type) sizeof rawptr->u, 94 abfd) != sizeof rawptr->u) 95 { 96 bfd_set_error (bfd_error_wrong_format); 97 return NULL; 98 } 99 100 /* Sanity check perhaps??? */ 101 if (rawptr->u.u_dsize > 0x1000000) /* Remember, it's in pages... */ 102 { 103 bfd_set_error (bfd_error_wrong_format); 104 return NULL; 105 } 106 if (rawptr->u.u_ssize > 0x1000000) 107 { 108 bfd_set_error (bfd_error_wrong_format); 109 return NULL; 110 } 111 return &rawptr->u; 112} 113 114const bfd_target * 115sco5_core_file_p (abfd) 116 bfd *abfd; 117{ 118 int coffset_siz, val, nsecs, cheadoffs; 119 int coresize; 120 struct user *u; 121 struct coreoffsets coffsets; 122 struct coresecthead chead; 123 char *secname; 124 flagword flags; 125 126 /* Read coreoffsets region at end of core (see core(FP)). */ 127 128 { 129 struct stat statbuf; 130 131 if (bfd_stat (abfd, &statbuf) < 0) 132 return NULL; 133 134 coresize = statbuf.st_size; 135 } 136 /* Last long in core is sizeof struct coreoffsets, read it */ 137 if ((bfd_seek (abfd, (file_ptr) (coresize - sizeof coffset_siz), 138 SEEK_SET) != 0) 139 || bfd_bread ((void *) &coffset_siz, (bfd_size_type) sizeof coffset_siz, 140 abfd) != sizeof coffset_siz) 141 { 142 bfd_set_error (bfd_error_wrong_format); 143 return NULL; 144 } 145 146 /* Use it to seek start of coreoffsets region, read it and determine 147 validity */ 148 if ((bfd_seek (abfd, (file_ptr) (coresize - coffset_siz), SEEK_SET) != 0) 149 || (bfd_bread ((void *) &coffsets, (bfd_size_type) sizeof coffsets, abfd) 150 != sizeof coffsets) 151 || ((coffsets.u_info != 1) && (coffsets.u_info != C_VERSION))) 152 { 153 bfd_set_error (bfd_error_wrong_format); 154 return NULL; 155 } 156 157 if (coffsets.u_info == 1) 158 { 159 /* Old version, no section heads, read info from user struct */ 160 161 u = read_uarea (abfd, coffsets.u_user); 162 if (! u) 163 goto fail; 164 165 if (!make_bfd_asection (abfd, ".reg", SEC_HAS_CONTENTS, 166 (bfd_size_type) coffsets.u_usize, 167 0 - (bfd_vma) u->u_ar0, 168 (file_ptr) coffsets.u_user)) 169 goto fail; 170 171 if (!make_bfd_asection (abfd, ".data", 172 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS, 173 ((bfd_size_type) u->u_exdata.ux_dsize 174 + u->u_exdata.ux_bsize), 175 (bfd_vma) u->u_exdata.ux_datorg, 176 (file_ptr) coffsets.u_data)) 177 goto fail; 178 179 if (!make_bfd_asection (abfd, ".stack", 180 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS, 181 (bfd_size_type) u->u_ssize * NBPC, 182 (bfd_vma) u->u_sub, 183 (file_ptr) coffsets.u_stack)) 184 goto fail; 185 186 return abfd->xvec; /* Done for version 1 */ 187 } 188 189 /* Immediately before coreoffsets region is a long with offset in core 190 to first coresecthead (CORES_OFFSETS), the long before this is the 191 number of section heads in the list. Read both longs and read the 192 coresecthead and check its validity */ 193 194 if ((bfd_seek (abfd, 195 (file_ptr) (coresize - coffset_siz - 2 * sizeof coffset_siz), 196 SEEK_SET) != 0) 197 || (bfd_bread ((void *) &nsecs, (bfd_size_type) sizeof nsecs, abfd) 198 != sizeof nsecs) 199 || (bfd_bread ((void *) &cheadoffs, (bfd_size_type) sizeof cheadoffs, 200 abfd) != sizeof cheadoffs) 201 || (bfd_seek (abfd, (file_ptr) cheadoffs, SEEK_SET) != 0) 202 || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd) 203 != sizeof chead) 204 || (chead.cs_stype != CORES_OFFSETS) 205 || (chead.cs_x.csx_magic != COREMAGIC_NUMBER)) 206 { 207 bfd_set_error (bfd_error_wrong_format); 208 goto fail; 209 } 210 211 /* OK, we believe you. You're a core file (sure, sure). */ 212 213 /* Now loop over all regions and map them */ 214 nsecs--; /* We've seen CORES_OFFSETS already */ 215 for (; nsecs; nsecs--) 216 { 217 if ((bfd_seek (abfd, (file_ptr) chead.cs_hseek, SEEK_SET) != 0) 218 || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd) 219 != sizeof chead)) 220 { 221 bfd_set_error (bfd_error_wrong_format); 222 goto fail; 223 } 224 225 switch (chead.cs_stype) 226 { 227 case CORES_MAGIC: /* Core header, check magic */ 228 if (chead.cs_x.csx_magic != COREMAGIC_NUMBER) 229 { 230 bfd_set_error (bfd_error_wrong_format); 231 goto fail; 232 } 233 secname = NULL; 234 nsecs++; /* MAGIC not in section cnt!*/ 235 break; 236 case CORES_UAREA: /* U-area, read in tdata */ 237 u = read_uarea (abfd, chead.cs_sseek); 238 if (! u) 239 goto fail; 240 241 /* This is tricky. As the "register section", we give them 242 the entire upage and stack. u.u_ar0 points to where 243 "register 0" is stored. There are two tricks with this, 244 though. One is that the rest of the registers might be 245 at positive or negative (or both) displacements from 246 *u_ar0. The other is that u_ar0 is sometimes an absolute 247 address in kernel memory, and on other systems it is an 248 offset from the beginning of the `struct user'. 249 250 As a practical matter, we don't know where the registers 251 actually are, so we have to pass the whole area to GDB. 252 We encode the value of u_ar0 by setting the .regs section 253 up so that its virtual memory address 0 is at the place 254 pointed to by u_ar0 (by setting the vma of the start of 255 the section to -u_ar0). GDB uses this info to locate the 256 regs, using minor trickery to get around the 257 offset-or-absolute-addr problem. */ 258 259 chead.cs_vaddr = 0 - (bfd_vma) u->u_ar0; 260 261 secname = ".reg"; 262 flags = SEC_HAS_CONTENTS; 263 264 break; 265 case CORES_PREGION: /* A program region, map it */ 266 switch (chead.cs_x.csx_preg.csxp_rtyp) 267 { 268 case PT_DATA: 269 secname = ".data"; /* Data region. */ 270 break; 271 case PT_STACK: 272 secname = ".stack"; /* Stack region. */ 273 break; 274 case PT_SHMEM: 275 secname = ".shmem"; /* Shared memory */ 276 break; 277 case PT_LIBDAT: 278 secname = ".libdat"; /* Shared library data */ 279 break; 280 case PT_V86: 281 secname = ".virt86"; /* Virtual 8086 mode */ 282 break; 283 case PT_SHFIL: 284 secname = ".mmfile"; /* Memory mapped file */ 285 break; 286 case PT_XDATA0: 287 secname = ".Xdat0"; /* XENIX data region, virtual 0 */ 288 break; 289 default: 290 secname = ""; 291 } 292 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 293 break; 294 case CORES_PROC: /* struct proc */ 295 case CORES_ITIMER: /* interval timers */ 296 case CORES_SCOUTSNAME: /* struct scoutsname */ 297 secname = NULL; /* Ignore these */ 298 break; 299 default: 300 (*_bfd_error_handler) ("Unhandled SCO core file section type %d\n", 301 chead.cs_stype); 302 continue; 303 } 304 305 if (secname 306 && !make_bfd_asection (abfd, secname, flags, 307 (bfd_size_type) chead.cs_vsize, 308 (bfd_vma) chead.cs_vaddr, 309 (file_ptr) chead.cs_sseek)) 310 goto fail; 311 312 } 313 314 return abfd->xvec; 315 316 fail: 317 if (abfd->tdata.any) 318 { 319 bfd_release (abfd, abfd->tdata.any); 320 abfd->tdata.any = NULL; 321 } 322 bfd_section_list_clear (abfd); 323 return NULL; 324} 325 326char * 327sco5_core_file_failing_command (abfd) 328 bfd *abfd; 329{ 330 char *com = abfd->tdata.sco5_core_data->u.u_comm; 331 if (*com) 332 return com; 333 else 334 return NULL; 335} 336 337int 338sco5_core_file_failing_signal (ignore_abfd) 339 bfd *ignore_abfd; 340{ 341 return ((ignore_abfd->tdata.sco5_core_data->u.u_sysabort != 0) 342 ? ignore_abfd->tdata.sco5_core_data->u.u_sysabort 343 : -1); 344} 345 346/* If somebody calls any byte-swapping routines, shoot them. */ 347static void 348swap_abort () 349{ 350 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 351} 352 353#define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 354#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 355#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 356#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 357#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 358#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 359 360const bfd_target sco5_core_vec = 361 { 362 "sco5-core", 363 bfd_target_unknown_flavour, 364 BFD_ENDIAN_LITTLE, /* target byte order */ 365 BFD_ENDIAN_LITTLE, /* target headers byte order */ 366 (HAS_RELOC | EXEC_P | /* object flags */ 367 HAS_LINENO | HAS_DEBUG | 368 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 369 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 370 0, /* symbol prefix */ 371 ' ', /* ar_pad_char */ 372 16, /* ar_max_namelen */ 373 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 374 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 375 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 376 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 377 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 378 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 379 380 { /* bfd_check_format */ 381 _bfd_dummy_target, /* unknown format */ 382 _bfd_dummy_target, /* object file */ 383 _bfd_dummy_target, /* archive */ 384 sco5_core_file_p /* a core file */ 385 }, 386 { /* bfd_set_format */ 387 bfd_false, bfd_false, 388 bfd_false, bfd_false 389 }, 390 { /* bfd_write_contents */ 391 bfd_false, bfd_false, 392 bfd_false, bfd_false 393 }, 394 395 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 396 BFD_JUMP_TABLE_COPY (_bfd_generic), 397 BFD_JUMP_TABLE_CORE (sco5), 398 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 399 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 400 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 401 BFD_JUMP_TABLE_WRITE (_bfd_generic), 402 BFD_JUMP_TABLE_LINK (_bfd_nolink), 403 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 404 405 NULL, 406 407 (PTR) 0 /* backend_data */ 408 }; 409