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/* BFD back-end for HP/UX core files.

   Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006,

   2007, 2008 Free Software Foundation, Inc.

   Written by Stu Grossman, Cygnus Support.

   Converted to back-end form by Ian Lance Taylor, Cygnus SUpport

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

/* This file can only be compiled on systems which use HP/UX style

   core files.  */

#include "sysdep.h"

#include "bfd.h"

#include "libbfd.h"

#if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX)

/* FIXME: sys/core.h doesn't exist for HPUX version 7.  HPUX version

   5, 6, and 7 core files seem to be standard trad-core.c type core

   files; can we just use trad-core.c in addition to this file?  */

#include <sys/core.h>

#include <sys/utsname.h>

#endif /* HOST_HPPAHPUX */

#ifdef HOST_HPPABSD

/* Not a very swift place to put it, but that's where the BSD port

   puts them.  */

#include "/hpux/usr/include/sys/core.h"

#endif /* HOST_HPPABSD */

#include <sys/param.h>

#ifdef HAVE_DIRENT_H

# include <dirent.h>

#else

# ifdef HAVE_SYS_NDIR_H

#  include <sys/ndir.h>

# endif

# ifdef HAVE_SYS_DIR_H

#  include <sys/dir.h>

# endif

# ifdef HAVE_NDIR_H

#  include <ndir.h>

# endif

#endif

#include <signal.h>

#ifdef HPUX_CORE

#include <machine/reg.h>

#endif

#include <sys/file.h>

/* Kludge: There's no explicit mechanism provided by sys/core.h to

   conditionally know whether a proc_info has thread id fields.

   However, CORE_ANON_SHMEM shows up first at 10.30, which is

   happily also when meaningful thread id's show up in proc_info. */

#if defined(CORE_ANON_SHMEM)

#define PROC_INFO_HAS_THREAD_ID (1)

#endif

/* This type appears at HP-UX 10.30.  Defining it if not defined

   by sys/core.h allows us to build for older HP-UX's, and (since

   it won't be encountered in core-dumps from older HP-UX's) is

   harmless. */

#if !defined(CORE_ANON_SHMEM)

#define CORE_ANON_SHMEM 0x00000200         /* anonymous shared memory */

#endif

/* These are stored in the bfd's tdata */

/* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they

   are set to 0.  Also, until HP-UX implements MxN threads, .user_tid and

   .lwpid are synonymous. */

struct hpux_core_struct

{

  int sig;

  int lwpid;               /* Kernel thread ID. */

  unsigned long user_tid;  /* User thread ID. */

  char cmd[MAXCOMLEN + 1];

};

#define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)

#define core_signal(bfd) (core_hdr(bfd)->sig)

#define core_command(bfd) (core_hdr(bfd)->cmd)

#define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)

#define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)

#define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p

static asection *make_bfd_asection (bfd *, const char *, flagword,

                                    bfd_size_type, bfd_vma, unsigned int);

static const bfd_target *hpux_core_core_file_p (bfd *);

static char *hpux_core_core_file_failing_command (bfd *);

static int hpux_core_core_file_failing_signal (bfd *);

static void swap_abort (void);

static asection *

make_bfd_asection (bfd *abfd, const char *name, flagword flags,

                   bfd_size_type size, bfd_vma vma,

                   unsigned int alignment_power)

{

  asection *asect;

  char *newname;

  newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);

  if (!newname)

    return NULL;

  strcpy (newname, name);

  asect = bfd_make_section_anyway_with_flags (abfd, newname, flags);

  if (!asect)

    return NULL;

  asect->size = size;

  asect->vma = vma;

  asect->filepos = bfd_tell (abfd);

  asect->alignment_power = alignment_power;

  return asect;

}

/* Return true if the given core file section corresponds to a thread,

   based on its name.  */

static int

thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,

                  asection *sect,

                  void *obj ATTRIBUTE_UNUSED)

{

  return CONST_STRNEQ (sect->name, ".reg/");

}

/* this function builds a bfd target if the file is a corefile.

   It returns null or 0 if it finds out thaat it is not a core file.

   The way it checks this is by looking for allowed 'type' field values.

   These are declared in sys/core.h

   There are some values which are 'reserved for future use'. In particular

   CORE_NONE is actually defined as 0. This may be a catch-all for cases

   in which the core file is generated by some non-hpux application.

   (I am just guessing here!)

*/

static const bfd_target *

hpux_core_core_file_p (bfd *abfd)

{

  int  good_sections = 0;

  int  unknown_sections = 0;

  core_hdr (abfd) = (struct hpux_core_struct *)

    bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));

  if (!core_hdr (abfd))

    return NULL;

  while (1)

    {

      int val;

      struct corehead core_header;

      val = bfd_bread ((void *) &core_header,

                      (bfd_size_type) sizeof core_header, abfd);

      if (val <= 0)

        break;

      switch (core_header.type)

        {

        case CORE_KERNEL:

        case CORE_FORMAT:

          /* Just skip this.  */

          bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);

          good_sections++;

          break;

        case CORE_EXEC:

          {

            struct proc_exec proc_exec;

            if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,

                          abfd) != core_header.len)

              break;

            strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);

            good_sections++;

          }

          break;

        case CORE_PROC:

          {

            struct proc_info proc_info;

            char  secname[100];  /* Of arbitrary size, but plenty large. */

            /* We need to read this section, 'cause we need to determine

               whether the core-dumped app was threaded before we create

               any .reg sections. */

            if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)

                != core_header.len)

              break;

              /* However, we also want to create those sections with the

                 file positioned at the start of the record, it seems. */

            if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)

              break;

#if defined(PROC_INFO_HAS_THREAD_ID)

            core_kernel_thread_id (abfd) = proc_info.lwpid;

            core_user_thread_id (abfd) = proc_info.user_tid;

#else

            core_kernel_thread_id (abfd) = 0;

            core_user_thread_id (abfd) = 0;

#endif

            /* If the program was unthreaded, then we'll just create a

               .reg section.

               If the program was threaded, then we'll create .reg/XXXXX

               section for each thread, where XXXXX is a printable

               representation of the kernel thread id.  We'll also

               create a .reg section for the thread that was running

               and signalled at the time of the core-dump (i.e., this

               is effectively an alias, needed to keep GDB happy.)

               Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'

               because GDB expects that .reg2 will be the floating-

               point registers. */

            if (core_kernel_thread_id (abfd) == 0)

              {

                if (!make_bfd_asection (abfd, ".reg",

                                        SEC_HAS_CONTENTS,

                                        core_header.len,

                                        (bfd_vma) offsetof (struct proc_info,

                                                            hw_regs),

                                        2))

                  goto fail;

              }

            else

              {

                /* There are threads.  Is this the one that caused the

                   core-dump?  We'll claim it was the running thread. */

                if (proc_info.sig != -1)

                  {

                    if (!make_bfd_asection (abfd, ".reg",

                                            SEC_HAS_CONTENTS,

                                            core_header.len,

                                            (bfd_vma)offsetof (struct proc_info,

                                                               hw_regs),

                                            2))

                      goto fail;

                  }

                /* We always make one of these sections, for every thread. */

                sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));

                if (!make_bfd_asection (abfd, secname,

                                        SEC_HAS_CONTENTS,

                                        core_header.len,

                                        (bfd_vma) offsetof (struct proc_info,

                                                            hw_regs),

                                        2))

                  goto fail;

              }

            core_signal (abfd) = proc_info.sig;

            if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)

              break;

            good_sections++;

          }

          break;

        case CORE_DATA:

        case CORE_STACK:

        case CORE_TEXT:

        case CORE_MMF:

        case CORE_SHM:

        case CORE_ANON_SHMEM:

          if (!make_bfd_asection (abfd, ".data",

                                  SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,

                                  core_header.len,

                                  (bfd_vma) core_header.addr, 2))

            goto fail;

          bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);

          good_sections++;

          break;

        case CORE_NONE:

          /* Let's not punt if we encounter a section of unknown

             type.  Rather, let's make a note of it.  If we later

             see that there were also "good" sections, then we'll

             declare that this a core file, but we'll also warn that

             it may be incompatible with this gdb.

             */

          unknown_sections++;

          break;

         default:

           goto fail; /*unrecognized core file type */

        }

    }

  /* OK, we believe you.  You're a core file (sure, sure).  */

  /* On HP/UX, we sometimes encounter core files where none of the threads

     was found to be the running thread (ie the signal was set to -1 for

     all threads).  This happens when the program was aborted externally

     via a TT_CORE ttrace system call.  In that case, we just pick one

     thread at random to be the active thread.  */

  if (core_kernel_thread_id (abfd) != 0

      && bfd_get_section_by_name (abfd, ".reg") == NULL)

    {

      asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);

      asection *reg_sect;

      if (asect != NULL)

        {

          reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,

                                        asect->size, asect->vma,

                                        asect->alignment_power);

          if (reg_sect == NULL)

            goto fail;

          reg_sect->filepos = asect->filepos;

        }

    }

  /* Were there sections of unknown type?  If so, yet there were

     at least some complete sections of known type, then, issue

     a warning.  Possibly the core file was generated on a version

     of HP-UX that is incompatible with that for which this gdb was

     built.

     */

  if ((unknown_sections > 0) && (good_sections > 0))

    (*_bfd_error_handler)

      ("%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",

       abfd->filename);

  return abfd->xvec;

 fail:

  bfd_release (abfd, core_hdr (abfd));

  core_hdr (abfd) = NULL;

  bfd_section_list_clear (abfd);

  return NULL;

}

static char *

hpux_core_core_file_failing_command (bfd *abfd)

{

  return core_command (abfd);

}

static int

hpux_core_core_file_failing_signal (bfd *abfd)

{

  return core_signal (abfd);

}

/* If somebody calls any byte-swapping routines, shoot them.  */

static void

swap_abort (void)

{

  abort(); /* This way doesn't require any declaration for ANSI to fuck up */

}

#define NO_GET ((bfd_vma (*) (const void *)) swap_abort)

#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)

#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)

#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)

#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)

#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)

const bfd_target hpux_core_vec =

  {

    "hpux-core",

    bfd_target_unknown_flavour,

    BFD_ENDIAN_BIG,             /* target byte order */

    BFD_ENDIAN_BIG,             /* target headers byte order */

    (HAS_RELOC | EXEC_P |       /* object flags */

     HAS_LINENO | HAS_DEBUG |

     HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),

    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */

    0,                                                      /* symbol prefix */

    ' ',                                                   /* ar_pad_char */

    16,                                                    /* ar_max_namelen */

    NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */

    NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */

    NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */

    NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */

    NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */

    NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */

    {                           /* bfd_check_format */

      _bfd_dummy_target,                /* unknown format */

      _bfd_dummy_target,                /* object file */

      _bfd_dummy_target,                /* archive */

      hpux_core_core_file_p             /* a core file */

    },

    {                           /* bfd_set_format */

      bfd_false, bfd_false,

      bfd_false, bfd_false

    },

    {                           /* bfd_write_contents */

      bfd_false, bfd_false,

      bfd_false, bfd_false

    },

    BFD_JUMP_TABLE_GENERIC (_bfd_generic),

    BFD_JUMP_TABLE_COPY (_bfd_generic),

    BFD_JUMP_TABLE_CORE (hpux_core),

    BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),

    BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),

    BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),

    BFD_JUMP_TABLE_WRITE (_bfd_generic),

    BFD_JUMP_TABLE_LINK (_bfd_nolink),

    BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

    NULL,

    (PTR) 0                      /* backend_data */

  };