binutils-gdb/bfd/trad-core.c

/* BFD back end for traditional Unix core files (U-area and sections, raw)
   Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.  */

/* This file does not define a particular back-end, but it defines routines
   that can be used by other back-ends.  */
#include <sysdep.h>
#include "bfd.h"
#include <stdio.h>
#include "libbfd.h"

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

#include <sys/types.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <machine/reg.h>

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

#include <errno.h>

/* need this cast b/c ptr is really void * */
#define core_hdr(bfd) (((struct core_data *) (bfd->tdata))->hdr)
#define core_datasec(bfd) (((struct core_data *) ((bfd)->tdata))->data_section)
#define core_stacksec(bfd) (((struct core_data*)((bfd)->tdata))->stack_section)
#define core_regsec(bfd) (((struct core_data *) ((bfd)->tdata))->reg_section)
#define core_upage(bfd) (((struct core_data *) ((bfd)->tdata))->upage)

/* These are stored in the bfd's tdata */
struct core_data {
  struct user *upage;             /* core file header */
  asection *data_section;
  asection *stack_section;
  asection *reg_section;
};

/* ARGSUSED */
bfd_target *
trad_unix_core_file_p (abfd)
     bfd *abfd;
{
#if HOST_SYS == SUN_SYS
  return 0;
#else
  int val;
  char *rawptr;
  struct user u;
  unsigned int reg_offset, fp_reg_offset;

  /* 4.2-style (and perhaps also sysV-style) core dump file.  */

  val = bfd_read ((void *)&u, 1, sizeof u, abfd);
  if (val != sizeof u)
    return 0;			/* Too small to be a core file */

  /* Sanity check perhaps??? */
  if (u.u_dsize > 0x1000000)	/* Remember, it's in pages... */
    return 0;
  if (u.u_ssize > 0x1000000)
    return 0;
  /* Check that the size claimed is no greater than the file size. FIXME. */

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

  /* Allocate both the upage and the struct core_data at once, so
     a single free() will free them both.  */
  rawptr = (char *)zalloc (sizeof (u) + sizeof (struct core_data));
  if (rawptr == NULL) {
    bfd_error = no_memory;
    return 0;
  }
  
  set_tdata (abfd, (struct core_data *)rawptr);
  core_upage (abfd) = (struct user *)(rawptr + sizeof (struct core_data));
  *core_upage (abfd) = u;		/* Save that upage! */

  /* create the sections.  This is raunchy, but bfd_close wants to reclaim
     them */
  core_stacksec (abfd) = (asection *) zalloc (sizeof (asection));
  if (core_stacksec (abfd) == NULL) {
loser:
    bfd_error = no_memory;
    free ((void *)rawptr);
    return 0;
  }
  core_datasec (abfd) = (asection *) zalloc (sizeof (asection));
  if (core_datasec (abfd) == NULL) {
loser1:
    free ((void *)core_stacksec (abfd));
    goto loser;
  }
  core_regsec (abfd) = (asection *) zalloc (sizeof (asection));
  if (core_regsec (abfd) == NULL) {
loser2:
    free ((void *)core_datasec (abfd));
    goto loser1;
  }

  core_stacksec (abfd)->name = ".stack";
  core_datasec (abfd)->name = ".data";
  core_regsec (abfd)->name = ".reg";

  core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD;
  core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD;
  core_regsec (abfd)->flags = SEC_ALLOC;

  core_datasec (abfd)->size =  NBPG * u.u_dsize;
  core_stacksec (abfd)->size = NBPG * u.u_ssize;
  core_regsec (abfd)->size = NBPG * UPAGES;  /* Larger than sizeof struct u */

  /* What a hack... we'd like to steal it from the exec file,
     since the upage does not seem to provide it.  FIXME.  */
  core_datasec (abfd)->vma = TEXT_START_ADDR + (NBPG * u.u_tsize);
  core_stacksec (abfd)->vma = STACK_END_ADDR - (NBPG * u.u_ssize);
  core_regsec (abfd)->vma = -1;

  core_datasec (abfd)->filepos = NBPG * UPAGES;
  core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize;
  core_regsec (abfd)->filepos = 0;	/* Register segment is the upage */

  /* Align to word at least */
  core_stacksec (abfd)->alignment_power = 2;
  core_datasec (abfd)->alignment_power = 2;
  core_regsec (abfd)->alignment_power = 2;

  abfd->sections = core_stacksec (abfd);
  core_stacksec (abfd)->next = core_datasec (abfd);
  core_datasec (abfd)->next = core_regsec (abfd);
  abfd->section_count = 3;

  return abfd->xvec;
#endif
}

char *
trad_unix_core_file_failing_command (abfd)
     bfd *abfd;
{
  if (*core_upage (abfd)->u_comm)
    return core_upage (abfd)->u_comm;
  else
    return 0;
}

/* ARGSUSED */
int
trad_unix_core_file_failing_signal (ignore_abfd)
     bfd *ignore_abfd;
{
  return -1;		/* FIXME, where is it? */
}

/* ARGSUSED */
boolean
trad_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
     bfd *core_bfd, *exec_bfd;
{
  return true;		/* FIXME, We have no way of telling at this point */
}