1/* BFD back-end for HP/UX core files. 2 Copyright (C) 1993-2017 Free Software Foundation, Inc. 3 Written by Stu Grossman, Cygnus Support. 4 Converted to back-end form by Ian Lance Taylor, Cygnus SUpport 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 24/* This file can only be compiled on systems which use HP/UX style 25 core files. */ 26 27#include "sysdep.h" 28#include "bfd.h" 29#include "libbfd.h" 30 31#if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX) 32 33/* FIXME: sys/core.h doesn't exist for HPUX version 7. HPUX version 34 5, 6, and 7 core files seem to be standard trad-core.c type core 35 files; can we just use trad-core.c in addition to this file? */ 36 37#include <sys/core.h> 38#include <sys/utsname.h> 39 40#endif /* HOST_HPPAHPUX */ 41 42#ifdef HOST_HPPABSD 43 44/* Not a very swift place to put it, but that's where the BSD port 45 puts them. */ 46#include "/hpux/usr/include/sys/core.h" 47 48#endif /* HOST_HPPABSD */ 49 50#include <sys/param.h> 51#ifdef HAVE_DIRENT_H 52# include <dirent.h> 53#else 54# ifdef HAVE_SYS_NDIR_H 55# include <sys/ndir.h> 56# endif 57# ifdef HAVE_SYS_DIR_H 58# include <sys/dir.h> 59# endif 60# ifdef HAVE_NDIR_H 61# include <ndir.h> 62# endif 63#endif 64#include <signal.h> 65#ifdef HPUX_CORE 66#include <machine/reg.h> 67#endif 68#include <sys/file.h> 69 70/* Kludge: There's no explicit mechanism provided by sys/core.h to 71 conditionally know whether a proc_info has thread id fields. 72 However, CORE_ANON_SHMEM shows up first at 10.30, which is 73 happily also when meaningful thread id's show up in proc_info. */ 74#if defined(CORE_ANON_SHMEM) 75#define PROC_INFO_HAS_THREAD_ID (1) 76#endif 77 78/* This type appears at HP-UX 10.30. Defining it if not defined 79 by sys/core.h allows us to build for older HP-UX's, and (since 80 it won't be encountered in core-dumps from older HP-UX's) is 81 harmless. */ 82#if !defined(CORE_ANON_SHMEM) 83#define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */ 84#endif 85 86/* These are stored in the bfd's tdata */ 87 88/* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they 89 are set to 0. Also, until HP-UX implements MxN threads, .user_tid and 90 .lwpid are synonymous. */ 91struct hpux_core_struct 92{ 93 int sig; 94 int lwpid; /* Kernel thread ID. */ 95 unsigned long user_tid; /* User thread ID. */ 96 char cmd[MAXCOMLEN + 1]; 97}; 98 99#define core_hdr(bfd) ((bfd)->tdata.hpux_core_data) 100#define core_signal(bfd) (core_hdr(bfd)->sig) 101#define core_command(bfd) (core_hdr(bfd)->cmd) 102#define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid) 103#define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid) 104#define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p 105#define hpux_core_core_file_pid _bfd_nocore_core_file_pid 106 107static asection *make_bfd_asection (bfd *, const char *, flagword, 108 bfd_size_type, bfd_vma, unsigned int); 109static const bfd_target *hpux_core_core_file_p (bfd *); 110static char *hpux_core_core_file_failing_command (bfd *); 111static int hpux_core_core_file_failing_signal (bfd *); 112static void swap_abort (void); 113 114static asection * 115make_bfd_asection (bfd *abfd, const char *name, flagword flags, 116 bfd_size_type size, bfd_vma vma, 117 unsigned int alignment_power) 118{ 119 asection *asect; 120 char *newname; 121 122 newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1); 123 if (!newname) 124 return NULL; 125 126 strcpy (newname, name); 127 128 asect = bfd_make_section_anyway_with_flags (abfd, newname, flags); 129 if (!asect) 130 return NULL; 131 132 asect->size = size; 133 asect->vma = vma; 134 asect->filepos = bfd_tell (abfd); 135 asect->alignment_power = alignment_power; 136 137 return asect; 138} 139 140/* Return true if the given core file section corresponds to a thread, 141 based on its name. */ 142 143static int 144thread_section_p (bfd *abfd ATTRIBUTE_UNUSED, 145 asection *sect, 146 void *obj ATTRIBUTE_UNUSED) 147{ 148 return CONST_STRNEQ (sect->name, ".reg/"); 149} 150 151/* this function builds a bfd target if the file is a corefile. 152 It returns null or 0 if it finds out thaat it is not a core file. 153 The way it checks this is by looking for allowed 'type' field values. 154 These are declared in sys/core.h 155 There are some values which are 'reserved for future use'. In particular 156 CORE_NONE is actually defined as 0. This may be a catch-all for cases 157 in which the core file is generated by some non-hpux application. 158 (I am just guessing here!) 159*/ 160static const bfd_target * 161hpux_core_core_file_p (bfd *abfd) 162{ 163 int good_sections = 0; 164 int unknown_sections = 0; 165 166 core_hdr (abfd) = (struct hpux_core_struct *) 167 bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct)); 168 if (!core_hdr (abfd)) 169 return NULL; 170 171 while (1) 172 { 173 int val; 174 struct corehead core_header; 175 176 val = bfd_bread ((void *) &core_header, 177 (bfd_size_type) sizeof core_header, abfd); 178 if (val <= 0) 179 break; 180 switch (core_header.type) 181 { 182 case CORE_KERNEL: 183 case CORE_FORMAT: 184 /* Just skip this. */ 185 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR); 186 good_sections++; 187 break; 188 case CORE_EXEC: 189 { 190 struct proc_exec proc_exec; 191 if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len, 192 abfd) != core_header.len) 193 break; 194 strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1); 195 good_sections++; 196 } 197 break; 198 case CORE_PROC: 199 { 200 struct proc_info proc_info; 201 char secname[100]; /* Of arbitrary size, but plenty large. */ 202 203 /* We need to read this section, 'cause we need to determine 204 whether the core-dumped app was threaded before we create 205 any .reg sections. */ 206 if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd) 207 != core_header.len) 208 break; 209 210 /* However, we also want to create those sections with the 211 file positioned at the start of the record, it seems. */ 212 if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0) 213 break; 214 215#if defined(PROC_INFO_HAS_THREAD_ID) 216 core_kernel_thread_id (abfd) = proc_info.lwpid; 217 core_user_thread_id (abfd) = proc_info.user_tid; 218#else 219 core_kernel_thread_id (abfd) = 0; 220 core_user_thread_id (abfd) = 0; 221#endif 222 /* If the program was unthreaded, then we'll just create a 223 .reg section. 224 225 If the program was threaded, then we'll create .reg/XXXXX 226 section for each thread, where XXXXX is a printable 227 representation of the kernel thread id. We'll also 228 create a .reg section for the thread that was running 229 and signalled at the time of the core-dump (i.e., this 230 is effectively an alias, needed to keep GDB happy.) 231 232 Note that we use `.reg/XXXXX' as opposed to '.regXXXXX' 233 because GDB expects that .reg2 will be the floating- 234 point registers. */ 235 if (core_kernel_thread_id (abfd) == 0) 236 { 237 if (!make_bfd_asection (abfd, ".reg", 238 SEC_HAS_CONTENTS, 239 core_header.len, 240 (bfd_vma) offsetof (struct proc_info, 241 hw_regs), 242 2)) 243 goto fail; 244 } 245 else 246 { 247 /* There are threads. Is this the one that caused the 248 core-dump? We'll claim it was the running thread. */ 249 if (proc_info.sig != -1) 250 { 251 if (!make_bfd_asection (abfd, ".reg", 252 SEC_HAS_CONTENTS, 253 core_header.len, 254 (bfd_vma)offsetof (struct proc_info, 255 hw_regs), 256 2)) 257 goto fail; 258 } 259 /* We always make one of these sections, for every thread. */ 260 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd)); 261 if (!make_bfd_asection (abfd, secname, 262 SEC_HAS_CONTENTS, 263 core_header.len, 264 (bfd_vma) offsetof (struct proc_info, 265 hw_regs), 266 2)) 267 goto fail; 268 } 269 core_signal (abfd) = proc_info.sig; 270 if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0) 271 break; 272 good_sections++; 273 } 274 break; 275 276 case CORE_DATA: 277 case CORE_STACK: 278 case CORE_TEXT: 279 case CORE_MMF: 280 case CORE_SHM: 281 case CORE_ANON_SHMEM: 282 if (!make_bfd_asection (abfd, ".data", 283 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS, 284 core_header.len, 285 (bfd_vma) core_header.addr, 2)) 286 goto fail; 287 288 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR); 289 good_sections++; 290 break; 291 292 case CORE_NONE: 293 /* Let's not punt if we encounter a section of unknown 294 type. Rather, let's make a note of it. If we later 295 see that there were also "good" sections, then we'll 296 declare that this a core file, but we'll also warn that 297 it may be incompatible with this gdb. 298 */ 299 unknown_sections++; 300 break; 301 302 default: 303 goto fail; /*unrecognized core file type */ 304 } 305 } 306 307 /* OK, we believe you. You're a core file (sure, sure). */ 308 309 /* On HP/UX, we sometimes encounter core files where none of the threads 310 was found to be the running thread (ie the signal was set to -1 for 311 all threads). This happens when the program was aborted externally 312 via a TT_CORE ttrace system call. In that case, we just pick one 313 thread at random to be the active thread. */ 314 if (core_kernel_thread_id (abfd) != 0 315 && bfd_get_section_by_name (abfd, ".reg") == NULL) 316 { 317 asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL); 318 asection *reg_sect; 319 320 if (asect != NULL) 321 { 322 reg_sect = make_bfd_asection (abfd, ".reg", asect->flags, 323 asect->size, asect->vma, 324 asect->alignment_power); 325 if (reg_sect == NULL) 326 goto fail; 327 328 reg_sect->filepos = asect->filepos; 329 } 330 } 331 332 /* Were there sections of unknown type? If so, yet there were 333 at least some complete sections of known type, then, issue 334 a warning. Possibly the core file was generated on a version 335 of HP-UX that is incompatible with that for which this gdb was 336 built. 337 */ 338 if ((unknown_sections > 0) && (good_sections > 0)) 339 _bfd_error_handler 340 ("%s appears to be a core file,\nbut contains unknown sections. It may have been created on an incompatible\nversion of HP-UX. As a result, some information may be unavailable.\n", 341 abfd->filename); 342 343 return abfd->xvec; 344 345 fail: 346 bfd_release (abfd, core_hdr (abfd)); 347 core_hdr (abfd) = NULL; 348 bfd_section_list_clear (abfd); 349 return NULL; 350} 351 352static char * 353hpux_core_core_file_failing_command (bfd *abfd) 354{ 355 return core_command (abfd); 356} 357 358static int 359hpux_core_core_file_failing_signal (bfd *abfd) 360{ 361 return core_signal (abfd); 362} 363 364 365/* If somebody calls any byte-swapping routines, shoot them. */ 366static void 367swap_abort (void) 368{ 369 abort(); /* This way doesn't require any declaration for ANSI to fuck up */ 370} 371 372#define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 373#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 374#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 375#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 376#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 377#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 378 379const bfd_target core_hpux_vec = 380 { 381 "hpux-core", 382 bfd_target_unknown_flavour, 383 BFD_ENDIAN_BIG, /* target byte order */ 384 BFD_ENDIAN_BIG, /* target headers byte order */ 385 (HAS_RELOC | EXEC_P | /* object flags */ 386 HAS_LINENO | HAS_DEBUG | 387 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 388 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 389 0, /* symbol prefix */ 390 ' ', /* ar_pad_char */ 391 16, /* ar_max_namelen */ 392 0, /* match priority. */ 393 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 394 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 395 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 396 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 397 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 398 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 399 400 { /* bfd_check_format */ 401 _bfd_dummy_target, /* unknown format */ 402 _bfd_dummy_target, /* object file */ 403 _bfd_dummy_target, /* archive */ 404 hpux_core_core_file_p /* a core file */ 405 }, 406 { /* bfd_set_format */ 407 bfd_false, bfd_false, 408 bfd_false, bfd_false 409 }, 410 { /* bfd_write_contents */ 411 bfd_false, bfd_false, 412 bfd_false, bfd_false 413 }, 414 415 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 416 BFD_JUMP_TABLE_COPY (_bfd_generic), 417 BFD_JUMP_TABLE_CORE (hpux_core), 418 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 419 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 420 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 421 BFD_JUMP_TABLE_WRITE (_bfd_generic), 422 BFD_JUMP_TABLE_LINK (_bfd_nolink), 423 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 424 425 NULL, 426 427 NULL /* backend_data */ 428 }; 429