1 /* BFD back-end for HP/UX core files. 2 Copyright (C) 1993-2022 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_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 #include <dirent.h> 52 #include <signal.h> 53 #ifdef HPUX_CORE 54 #include <machine/reg.h> 55 #endif 56 #include <sys/file.h> 57 58 /* Kludge: There's no explicit mechanism provided by sys/core.h to 59 conditionally know whether a proc_info has thread id fields. 60 However, CORE_ANON_SHMEM shows up first at 10.30, which is 61 happily also when meaningful thread id's show up in proc_info. */ 62 #if defined(CORE_ANON_SHMEM) 63 #define PROC_INFO_HAS_THREAD_ID (1) 64 #endif 65 66 /* This type appears at HP-UX 10.30. Defining it if not defined 67 by sys/core.h allows us to build for older HP-UX's, and (since 68 it won't be encountered in core-dumps from older HP-UX's) is 69 harmless. */ 70 #if !defined(CORE_ANON_SHMEM) 71 #define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */ 72 #endif 73 74 /* These are stored in the bfd's tdata */ 75 76 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they 77 are set to 0. Also, until HP-UX implements MxN threads, .user_tid and 78 .lwpid are synonymous. */ 79 struct hpux_core_struct 80 { 81 int sig; 82 int lwpid; /* Kernel thread ID. */ 83 unsigned long user_tid; /* User thread ID. */ 84 char cmd[MAXCOMLEN + 1]; 85 }; 86 87 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data) 88 #define core_signal(bfd) (core_hdr(bfd)->sig) 89 #define core_command(bfd) (core_hdr(bfd)->cmd) 90 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid) 91 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid) 92 #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p 93 #define hpux_core_core_file_pid _bfd_nocore_core_file_pid 94 95 static asection *make_bfd_asection (bfd *, const char *, flagword, 96 bfd_size_type, bfd_vma, unsigned int); 97 static bfd_cleanup hpux_core_core_file_p (bfd *); 98 static char *hpux_core_core_file_failing_command (bfd *); 99 static int hpux_core_core_file_failing_signal (bfd *); 100 static void swap_abort (void); 101 102 static asection * 103 make_bfd_asection (bfd *abfd, const char *name, flagword flags, 104 bfd_size_type size, bfd_vma vma, 105 unsigned int alignment_power) 106 { 107 asection *asect; 108 char *newname; 109 110 newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1); 111 if (!newname) 112 return NULL; 113 114 strcpy (newname, name); 115 116 asect = bfd_make_section_anyway_with_flags (abfd, newname, flags); 117 if (!asect) 118 return NULL; 119 120 asect->size = size; 121 asect->vma = vma; 122 asect->filepos = bfd_tell (abfd); 123 asect->alignment_power = alignment_power; 124 125 return asect; 126 } 127 128 /* Return true if the given core file section corresponds to a thread, 129 based on its name. */ 130 131 static int 132 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED, 133 asection *sect, 134 void *obj ATTRIBUTE_UNUSED) 135 { 136 return startswith (sect->name, ".reg/"); 137 } 138 139 /* this function builds a bfd target if the file is a corefile. 140 It returns null or 0 if it finds out thaat it is not a core file. 141 The way it checks this is by looking for allowed 'type' field values. 142 These are declared in sys/core.h 143 There are some values which are 'reserved for future use'. In particular 144 CORE_NONE is actually defined as 0. This may be a catch-all for cases 145 in which the core file is generated by some non-hpux application. 146 (I am just guessing here!) 147 */ 148 static bfd_cleanup 149 hpux_core_core_file_p (bfd *abfd) 150 { 151 int good_sections = 0; 152 int unknown_sections = 0; 153 154 core_hdr (abfd) = (struct hpux_core_struct *) 155 bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct)); 156 if (!core_hdr (abfd)) 157 return NULL; 158 159 while (1) 160 { 161 int val; 162 struct corehead core_header; 163 164 val = bfd_bread ((void *) &core_header, 165 (bfd_size_type) sizeof core_header, abfd); 166 if (val <= 0) 167 break; 168 switch (core_header.type) 169 { 170 case CORE_KERNEL: 171 case CORE_FORMAT: 172 /* Just skip this. */ 173 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR); 174 good_sections++; 175 break; 176 case CORE_EXEC: 177 { 178 struct proc_exec proc_exec; 179 if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len, 180 abfd) != core_header.len) 181 break; 182 strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1); 183 good_sections++; 184 } 185 break; 186 case CORE_PROC: 187 { 188 struct proc_info proc_info; 189 char secname[100]; /* Of arbitrary size, but plenty large. */ 190 191 /* We need to read this section, 'cause we need to determine 192 whether the core-dumped app was threaded before we create 193 any .reg sections. */ 194 if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd) 195 != core_header.len) 196 break; 197 198 /* However, we also want to create those sections with the 199 file positioned at the start of the record, it seems. */ 200 if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0) 201 break; 202 203 #if defined(PROC_INFO_HAS_THREAD_ID) 204 core_kernel_thread_id (abfd) = proc_info.lwpid; 205 core_user_thread_id (abfd) = proc_info.user_tid; 206 #else 207 core_kernel_thread_id (abfd) = 0; 208 core_user_thread_id (abfd) = 0; 209 #endif 210 /* If the program was unthreaded, then we'll just create a 211 .reg section. 212 213 If the program was threaded, then we'll create .reg/XXXXX 214 section for each thread, where XXXXX is a printable 215 representation of the kernel thread id. We'll also 216 create a .reg section for the thread that was running 217 and signalled at the time of the core-dump (i.e., this 218 is effectively an alias, needed to keep GDB happy.) 219 220 Note that we use `.reg/XXXXX' as opposed to '.regXXXXX' 221 because GDB expects that .reg2 will be the floating- 222 point registers. */ 223 if (core_kernel_thread_id (abfd) == 0) 224 { 225 if (!make_bfd_asection (abfd, ".reg", 226 SEC_HAS_CONTENTS, 227 core_header.len, 228 (bfd_vma) offsetof (struct proc_info, 229 hw_regs), 230 2)) 231 goto fail; 232 } 233 else 234 { 235 /* There are threads. Is this the one that caused the 236 core-dump? We'll claim it was the running thread. */ 237 if (proc_info.sig != -1) 238 { 239 if (!make_bfd_asection (abfd, ".reg", 240 SEC_HAS_CONTENTS, 241 core_header.len, 242 (bfd_vma)offsetof (struct proc_info, 243 hw_regs), 244 2)) 245 goto fail; 246 } 247 /* We always make one of these sections, for every thread. */ 248 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd)); 249 if (!make_bfd_asection (abfd, secname, 250 SEC_HAS_CONTENTS, 251 core_header.len, 252 (bfd_vma) offsetof (struct proc_info, 253 hw_regs), 254 2)) 255 goto fail; 256 } 257 core_signal (abfd) = proc_info.sig; 258 if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0) 259 break; 260 good_sections++; 261 } 262 break; 263 264 case CORE_DATA: 265 case CORE_STACK: 266 case CORE_TEXT: 267 case CORE_MMF: 268 case CORE_SHM: 269 case CORE_ANON_SHMEM: 270 if (!make_bfd_asection (abfd, ".data", 271 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS, 272 core_header.len, 273 (bfd_vma) core_header.addr, 2)) 274 goto fail; 275 276 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR); 277 good_sections++; 278 break; 279 280 case CORE_NONE: 281 /* Let's not punt if we encounter a section of unknown 282 type. Rather, let's make a note of it. If we later 283 see that there were also "good" sections, then we'll 284 declare that this a core file, but we'll also warn that 285 it may be incompatible with this gdb. 286 */ 287 unknown_sections++; 288 break; 289 290 default: 291 goto fail; /*unrecognized core file type */ 292 } 293 } 294 295 /* OK, we believe you. You're a core file (sure, sure). */ 296 297 /* On HP/UX, we sometimes encounter core files where none of the threads 298 was found to be the running thread (ie the signal was set to -1 for 299 all threads). This happens when the program was aborted externally 300 via a TT_CORE ttrace system call. In that case, we just pick one 301 thread at random to be the active thread. */ 302 if (core_kernel_thread_id (abfd) != 0 303 && bfd_get_section_by_name (abfd, ".reg") == NULL) 304 { 305 asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL); 306 asection *reg_sect; 307 308 if (asect != NULL) 309 { 310 reg_sect = make_bfd_asection (abfd, ".reg", asect->flags, 311 asect->size, asect->vma, 312 asect->alignment_power); 313 if (reg_sect == NULL) 314 goto fail; 315 316 reg_sect->filepos = asect->filepos; 317 } 318 } 319 320 /* Were there sections of unknown type? If so, yet there were 321 at least some complete sections of known type, then, issue 322 a warning. Possibly the core file was generated on a version 323 of HP-UX that is incompatible with that for which this gdb was 324 built. 325 */ 326 if ((unknown_sections > 0) && (good_sections > 0)) 327 _bfd_error_handler 328 ("%pB appears to be a core file,\nbut contains unknown sections." 329 " It may have been created on an incompatible\nversion of HP-UX." 330 " As a result, some information may be unavailable.\n", 331 abfd); 332 333 return _bfd_no_cleanup; 334 335 fail: 336 bfd_release (abfd, core_hdr (abfd)); 337 core_hdr (abfd) = NULL; 338 bfd_section_list_clear (abfd); 339 return NULL; 340 } 341 342 static char * 343 hpux_core_core_file_failing_command (bfd *abfd) 344 { 345 return core_command (abfd); 346 } 347 348 static int 349 hpux_core_core_file_failing_signal (bfd *abfd) 350 { 351 return core_signal (abfd); 352 } 353 354 355 /* If somebody calls any byte-swapping routines, shoot them. */ 356 static void 357 swap_abort (void) 358 { 359 abort(); /* This way doesn't require any declaration for ANSI to fuck up */ 360 } 361 362 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 363 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 364 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 365 #define NO_GET64 ((uint64_t (*) (const void *)) swap_abort) 366 #define NO_PUT64 ((void (*) (uint64_t, void *)) swap_abort) 367 #define NO_GETS64 ((int64_t (*) (const void *)) swap_abort) 368 369 const bfd_target core_hpux_vec = 370 { 371 "hpux-core", 372 bfd_target_unknown_flavour, 373 BFD_ENDIAN_BIG, /* target byte order */ 374 BFD_ENDIAN_BIG, /* target headers byte order */ 375 (HAS_RELOC | EXEC_P | /* object flags */ 376 HAS_LINENO | HAS_DEBUG | 377 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 378 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 379 0, /* symbol prefix */ 380 ' ', /* ar_pad_char */ 381 16, /* ar_max_namelen */ 382 0, /* match priority. */ 383 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */ 384 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 385 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 386 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 387 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 388 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 389 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 390 391 { /* bfd_check_format */ 392 _bfd_dummy_target, /* unknown format */ 393 _bfd_dummy_target, /* object file */ 394 _bfd_dummy_target, /* archive */ 395 hpux_core_core_file_p /* a core file */ 396 }, 397 { /* bfd_set_format */ 398 _bfd_bool_bfd_false_error, 399 _bfd_bool_bfd_false_error, 400 _bfd_bool_bfd_false_error, 401 _bfd_bool_bfd_false_error 402 }, 403 { /* bfd_write_contents */ 404 _bfd_bool_bfd_false_error, 405 _bfd_bool_bfd_false_error, 406 _bfd_bool_bfd_false_error, 407 _bfd_bool_bfd_false_error 408 }, 409 410 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 411 BFD_JUMP_TABLE_COPY (_bfd_generic), 412 BFD_JUMP_TABLE_CORE (hpux_core), 413 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 414 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 415 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 416 BFD_JUMP_TABLE_WRITE (_bfd_generic), 417 BFD_JUMP_TABLE_LINK (_bfd_nolink), 418 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 419 420 NULL, 421 422 NULL /* backend_data */ 423 }; 424