bfd/hpux-core.c

   1 /* BFD back-end for HP/UX core files.
   2    Copyright (C) 1993-2019 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 #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. */
  91 struct 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
 107 static asection *make_bfd_asection (bfd *, const char *, flagword,
 108                                     bfd_size_type, bfd_vma, unsigned int);
 109 static const bfd_target *hpux_core_core_file_p (bfd *);
 110 static char *hpux_core_core_file_failing_command (bfd *);
 111 static int hpux_core_core_file_failing_signal (bfd *);
 112 static void swap_abort (void);
 113
 114 static asection *
 115 make_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
 143 static int
 144 thread_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 */
 160 static const bfd_target *
 161 hpux_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       ("%pB appears to be a core file,\nbut contains unknown sections."
 341        "  It may have been created on an incompatible\nversion of HP-UX."
 342        "  As a result, some information may be unavailable.\n",
 343        abfd);
 344
 345   return abfd->xvec;
 346
 347  fail:
 348   bfd_release (abfd, core_hdr (abfd));
 349   core_hdr (abfd) = NULL;
 350   bfd_section_list_clear (abfd);
 351   return NULL;
 352 }
 353
 354 static char *
 355 hpux_core_core_file_failing_command (bfd *abfd)
 356 {
 357   return core_command (abfd);
 358 }
 359
 360 static int
 361 hpux_core_core_file_failing_signal (bfd *abfd)
 362 {
 363   return core_signal (abfd);
 364 }
 365
 366 \f
 367 /* If somebody calls any byte-swapping routines, shoot them.  */
 368 static void
 369 swap_abort (void)
 370 {
 371   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 372 }
 373
 374 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 375 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 376 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 377 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 378 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 379 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 380
 381 const bfd_target core_hpux_vec =
 382   {
 383     "hpux-core",
 384     bfd_target_unknown_flavour,
 385     BFD_ENDIAN_BIG,             /* target byte order */
 386     BFD_ENDIAN_BIG,             /* target headers byte order */
 387     (HAS_RELOC | EXEC_P |       /* object flags */
 388      HAS_LINENO | HAS_DEBUG |
 389      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 390     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 391     0,                          /* symbol prefix */
 392     ' ',                        /* ar_pad_char */
 393     16,                         /* ar_max_namelen */
 394     0,                          /* match priority.  */
 395     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 396     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 397     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 398     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 399     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 400     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 401
 402     {                           /* bfd_check_format */
 403       _bfd_dummy_target,                /* unknown format */
 404       _bfd_dummy_target,                /* object file */
 405       _bfd_dummy_target,                /* archive */
 406       hpux_core_core_file_p             /* a core file */
 407     },
 408     {                           /* bfd_set_format */
 409       _bfd_bool_bfd_false_error,
 410       _bfd_bool_bfd_false_error,
 411       _bfd_bool_bfd_false_error,
 412       _bfd_bool_bfd_false_error
 413     },
 414     {                           /* bfd_write_contents */
 415       _bfd_bool_bfd_false_error,
 416       _bfd_bool_bfd_false_error,
 417       _bfd_bool_bfd_false_error,
 418       _bfd_bool_bfd_false_error
 419     },
 420
 421     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 422     BFD_JUMP_TABLE_COPY (_bfd_generic),
 423     BFD_JUMP_TABLE_CORE (hpux_core),
 424     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 425     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 426     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 427     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 428     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 429     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 430
 431     NULL,
 432
 433     NULL                        /* backend_data */
 434   };