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/* BFD backend for core files which use the ptrace_user structure
Copyright (C) 1993-2020 Free Software Foundation, Inc.
The structure of this file is based on trad-core.c written by John Gilmore
of Cygnus Support.
Modified to work with the ptrace_user structure by Kevin A. Buettner.
(Longterm it may be better to merge this file with trad-core.c)
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. */
#ifdef PTRACE_CORE
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/ptrace.h>
struct trad_core_struct
{
asection *data_section;
asection *stack_section;
asection *reg_section;
struct ptrace_user u;
};
#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
/* forward declarations */
const bfd_target *ptrace_unix_core_file_p (bfd *abfd);
char * ptrace_unix_core_file_failing_command (bfd *abfd);
int ptrace_unix_core_file_failing_signal (bfd *abfd);
#define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
#define ptrace_unix_core_file_pid _bfd_nocore_core_file_pid
static void swap_abort (void);
const bfd_target *
ptrace_unix_core_file_p (bfd *abfd)
{
int val;
struct ptrace_user u;
struct trad_core_struct *rawptr;
size_t amt;
flagword flags;
val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
|| u.pt_rev != _BCS_PTRACE_REV)
{
/* Too small to be a core file */
bfd_set_error (bfd_error_wrong_format);
return 0;
}
/* 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. */
amt = sizeof (struct trad_core_struct);
rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);
if (rawptr == NULL)
return 0;
abfd->tdata.trad_core_data = rawptr;
rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
/* Create the sections. */
flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
flags);
if (core_stacksec (abfd) == NULL)
goto fail;
core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
flags);
if (core_datasec (abfd) == NULL)
goto fail;
core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
SEC_HAS_CONTENTS);
if (core_regsec (abfd) == NULL)
goto fail;
/* FIXME: Need to worry about shared memory, library data, and library
text. I don't think that any of these things are supported on the
system on which I am developing this for though. */
core_datasec (abfd)->size = u.pt_dsize;
core_stacksec (abfd)->size = u.pt_ssize;
core_regsec (abfd)->size = sizeof (u);
core_datasec (abfd)->vma = u.pt_o_data_start;
core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */
core_datasec (abfd)->filepos = (int) u.pt_dataptr;
core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
/* Align to word at least */
core_stacksec (abfd)->alignment_power = 2;
core_datasec (abfd)->alignment_power = 2;
core_regsec (abfd)->alignment_power = 2;
return abfd->xvec;
fail:
bfd_release (abfd, abfd->tdata.any);
abfd->tdata.any = NULL;
bfd_section_list_clear (abfd);
return NULL;
}
char *
ptrace_unix_core_file_failing_command (bfd *abfd)
{
char *com = abfd->tdata.trad_core_data->u.pt_comm;
if (*com)
return com;
else
return 0;
}
int
ptrace_unix_core_file_failing_signal (bfd *abfd)
{
return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
}
/* 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 core_ptrace_vec =
{
"trad-core",
bfd_target_unknown_flavour,
BFD_ENDIAN_UNKNOWN, /* target byte order */
BFD_ENDIAN_UNKNOWN, /* 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 */
ptrace_unix_core_file_p /* a core file */
},
{ /* bfd_set_format */
_bfd_bool_bfd_false_error, bfd_false,
_bfd_bool_bfd_false_error, bfd_false
},
{ /* bfd_write_contents */
_bfd_bool_bfd_false_error, bfd_false,
_bfd_bool_bfd_false_error, bfd_false
},
BFD_JUMP_TABLE_GENERIC (_bfd_generic),
BFD_JUMP_TABLE_COPY (_bfd_generic),
BFD_JUMP_TABLE_CORE (ptrace_unix),
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,
NULL /* backend_data */
};
#endif /* PTRACE_CORE */
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