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/* BFD back end for SCO5 core files (U-area and raw sections)

   Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007

   Free Software Foundation, Inc.

   Written by Jouke Numan <jnuman@hiscom.nl>

   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.  */

#include "sysdep.h"

#include "bfd.h"

#include "libbfd.h"

#include "libaout.h"            /* BFD a.out internal data structures */

#include <stdio.h>

#include <sys/types.h>

#include <sys/param.h>

#include <sys/dir.h>

#include <signal.h>

#include <sys/user.h>           /* After a.out.h  */

#ifdef SCO5_CORE

#include <sys/paccess.h>

#include <sys/region.h>

#endif

struct sco5_core_struct

{

  struct user u;

};

/* forward declarations */

static asection *make_bfd_asection

  PARAMS ((bfd *, const char *, flagword, bfd_size_type, bfd_vma, file_ptr));

static struct user *read_uarea PARAMS ((bfd *, int));

const bfd_target *sco5_core_file_p PARAMS ((bfd *abfd));

char *sco5_core_file_failing_command PARAMS ((bfd *abfd));

int sco5_core_file_failing_signal PARAMS ((bfd *abfd));

#define sco5_core_file_matches_executable_p generic_core_file_matches_executable_p

#define sco5_core_file_pid _bfd_nocore_core_file_pid

static void swap_abort PARAMS ((void));

static asection *

make_bfd_asection (abfd, name, flags, size, vma, filepos)

     bfd *abfd;

     const char *name;

     flagword flags;

     bfd_size_type size;

     bfd_vma vma;

     file_ptr filepos;

{

  asection *asect;

  asect = bfd_make_section_anyway_with_flags (abfd, name, flags);

  if (!asect)

    return NULL;

  asect->size = size;

  asect->vma = vma;

  asect->filepos = filepos;

  asect->alignment_power = 2;

  return asect;

}

static struct user *

read_uarea(abfd, filepos)

     bfd *abfd;

     int filepos;

{

  struct sco5_core_struct *rawptr;

  bfd_size_type amt = sizeof (struct sco5_core_struct);

  rawptr = (struct sco5_core_struct *) bfd_zmalloc (amt);

  if (rawptr == NULL)

    return NULL;

  abfd->tdata.sco5_core_data = rawptr;

  if (bfd_seek (abfd, (file_ptr) filepos, SEEK_SET) != 0

      || bfd_bread ((void *) &rawptr->u, (bfd_size_type) sizeof rawptr->u,

                   abfd) != sizeof rawptr->u)

    {

      bfd_set_error (bfd_error_wrong_format);

      return NULL;

    }

  /* Sanity check perhaps??? */

  if (rawptr->u.u_dsize > 0x1000000)    /* Remember, it's in pages...  */

    {

      bfd_set_error (bfd_error_wrong_format);

      return NULL;

    }

  if (rawptr->u.u_ssize > 0x1000000)

    {

      bfd_set_error (bfd_error_wrong_format);

      return NULL;

    }

  return &rawptr->u;

}

const bfd_target *

sco5_core_file_p (abfd)

     bfd *abfd;

{

  int coffset_siz, val, nsecs, cheadoffs;

  int coresize;

  struct user *u;

  struct coreoffsets coffsets;

  struct coresecthead chead;

  char *secname;

  flagword flags;

  /* Read coreoffsets region at end of core (see core(FP)).  */

  {

    struct stat statbuf;

    if (bfd_stat (abfd, &statbuf) < 0)

      return NULL;

    coresize = statbuf.st_size;

  }

  /* Last long in core is sizeof struct coreoffsets, read it */

  if ((bfd_seek (abfd, (file_ptr) (coresize - sizeof coffset_siz),

                 SEEK_SET) != 0)

      || bfd_bread ((void *) &coffset_siz, (bfd_size_type) sizeof coffset_siz,

                   abfd) != sizeof coffset_siz)

    {

      bfd_set_error (bfd_error_wrong_format);

      return NULL;

    }

  /* Use it to seek start of coreoffsets region, read it and determine

     validity */

  if ((bfd_seek (abfd, (file_ptr) (coresize - coffset_siz), SEEK_SET) != 0)

      || (bfd_bread ((void *) &coffsets, (bfd_size_type) sizeof coffsets, abfd)

          != sizeof coffsets)

      || ((coffsets.u_info != 1) && (coffsets.u_info != C_VERSION)))

    {

      bfd_set_error (bfd_error_wrong_format);

      return NULL;

    }

  if (coffsets.u_info == 1)

    {

      /* Old version, no section heads, read info from user struct */

      u = read_uarea (abfd, coffsets.u_user);

      if (! u)

        goto fail;

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

                              (bfd_size_type) coffsets.u_usize,

                              (file_ptr) coffsets.u_user))

        goto fail;

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

                              SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,

                              ((bfd_size_type) u->u_exdata.ux_dsize

                               + u->u_exdata.ux_bsize),

                              (bfd_vma) u->u_exdata.ux_datorg,

                              (file_ptr) coffsets.u_data))

        goto fail;

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

                              SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,

                              (bfd_size_type) u->u_ssize * NBPC,

                              (bfd_vma) u->u_sub,

                              (file_ptr) coffsets.u_stack))

        goto fail;

      return abfd->xvec;                /* Done for version 1 */

    }

  /* Immediately before coreoffsets region is a long with offset in core

     to first coresecthead (CORES_OFFSETS), the long before this is the

     number of section heads in the list. Read both longs and read the

     coresecthead and check its validity */

  if ((bfd_seek (abfd,

                 (file_ptr) (coresize - coffset_siz - 2 * sizeof coffset_siz),

                 SEEK_SET) != 0)

      || (bfd_bread ((void *) &nsecs, (bfd_size_type) sizeof nsecs, abfd)

          != sizeof nsecs)

      || (bfd_bread ((void *) &cheadoffs, (bfd_size_type) sizeof cheadoffs,

                    abfd) != sizeof cheadoffs)

      || (bfd_seek (abfd, (file_ptr) cheadoffs, SEEK_SET) != 0)

      || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd)

          != sizeof chead)

      || (chead.cs_stype != CORES_OFFSETS)

      || (chead.cs_x.csx_magic != COREMAGIC_NUMBER))

    {

      bfd_set_error (bfd_error_wrong_format);

      goto fail;

    }

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

  /* Now loop over all regions and map them */

  nsecs--;                              /* We've seen CORES_OFFSETS already */

  for (; nsecs; nsecs--)

    {

      if ((bfd_seek (abfd, (file_ptr) chead.cs_hseek, SEEK_SET) != 0)

          || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd)

              != sizeof chead))

        {

          bfd_set_error (bfd_error_wrong_format);

          goto fail;

        }

      switch (chead.cs_stype)

        {

        case CORES_MAGIC:                       /* Core header, check magic */

          if (chead.cs_x.csx_magic != COREMAGIC_NUMBER)

            {

              bfd_set_error (bfd_error_wrong_format);

              goto fail;

            }

          secname = NULL;

          nsecs++;                              /* MAGIC not in section cnt!*/

          break;

        case CORES_UAREA:                       /* U-area, read in tdata */

          u = read_uarea (abfd, chead.cs_sseek);

          if (! u)

            goto fail;

          /* This is tricky.  As the "register section", we give them

             the entire upage and stack.  u.u_ar0 points to where

             "register 0" is stored.  There are two tricks with this,

             though.  One is that the rest of the registers might be

             at positive or negative (or both) displacements from

             *u_ar0.  The other is that u_ar0 is sometimes an absolute

             address in kernel memory, and on other systems it is an

             offset from the beginning of the `struct user'.

             As a practical matter, we don't know where the registers

             actually are, so we have to pass the whole area to GDB.

             We encode the value of u_ar0 by setting the .regs section

             up so that its virtual memory address 0 is at the place

             pointed to by u_ar0 (by setting the vma of the start of

             the section to -u_ar0).  GDB uses this info to locate the

             regs, using minor trickery to get around the

             offset-or-absolute-addr problem.  */

          chead.cs_vaddr = 0 - (bfd_vma) u->u_ar0;

          secname = ".reg";

          flags = SEC_HAS_CONTENTS;

          break;

        case CORES_PREGION:                     /* A program region, map it */

          switch (chead.cs_x.csx_preg.csxp_rtyp)

            {

            case PT_DATA:

              secname = ".data";        /* Data region.          */

              break;

            case PT_STACK:

              secname = ".stack";       /* Stack region.         */

              break;

            case PT_SHMEM:

              secname = ".shmem";       /* Shared memory         */

              break;

            case PT_LIBDAT:

              secname = ".libdat";      /* Shared library data   */

              break;

            case PT_V86:

              secname = ".virt86";      /* Virtual 8086 mode     */

              break;

            case PT_SHFIL:

              secname = ".mmfile";      /* Memory mapped file    */

              break;

            case PT_XDATA0:

              secname = ".Xdat0";       /* XENIX data region, virtual 0 */

              break;

            default:

              secname = "";

            }

          flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;

          break;

        case CORES_PROC:                        /* struct proc */

        case CORES_ITIMER:                      /* interval timers */

        case CORES_SCOUTSNAME:                  /* struct scoutsname */

          secname = NULL;       /* Ignore these */

          break;

        default:

          (*_bfd_error_handler) ("Unhandled SCO core file section type %d\n",

                                 chead.cs_stype);

          continue;

        }

      if (secname

          && !make_bfd_asection (abfd, secname, flags,

                                 (bfd_size_type) chead.cs_vsize,

                                 (bfd_vma) chead.cs_vaddr,

                                 (file_ptr) chead.cs_sseek))

        goto fail;

    }

  return abfd->xvec;

 fail:

  if (abfd->tdata.any)

    {

      bfd_release (abfd, abfd->tdata.any);

      abfd->tdata.any = NULL;

    }

  bfd_section_list_clear (abfd);

  return NULL;

}

char *

sco5_core_file_failing_command (abfd)

     bfd *abfd;

{

  char *com = abfd->tdata.sco5_core_data->u.u_comm;

  if (*com)

    return com;

  else

    return NULL;

}

int

sco5_core_file_failing_signal (ignore_abfd)

     bfd *ignore_abfd;

{

  return ((ignore_abfd->tdata.sco5_core_data->u.u_sysabort != 0)

          ? ignore_abfd->tdata.sco5_core_data->u.u_sysabort

          : -1);

}

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

static void

swap_abort ()

{

  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 sco5_core_vec =

  {

    "sco5-core",

    bfd_target_unknown_flavour,

    BFD_ENDIAN_LITTLE,         /* target byte order */

    BFD_ENDIAN_LITTLE,         /* 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 */

      sco5_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 (sco5),

    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 */

  };