419 lines
12 KiB
C
419 lines
12 KiB
C
/* BFD back-end for CISCO crash dumps.
|
||
Copyright (C) 1994-2018 Free Software Foundation, Inc.
|
||
|
||
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"
|
||
/* core_file_failing_signal returns a host signal (this probably should
|
||
be fixed). */
|
||
#include <signal.h>
|
||
|
||
/* for MSVC builds */
|
||
#ifndef SIGTRAP
|
||
# define SIGTRAP 5
|
||
#endif
|
||
#ifndef SIGEMT
|
||
# define SIGEMT 6
|
||
#endif
|
||
#ifndef SIGBUS
|
||
# define SIGBUS 10
|
||
#endif
|
||
|
||
int crash_info_locs[] =
|
||
{
|
||
0x0250, /* mips, ppc, x86, i960 */
|
||
0x0400, /* m68k, mips, x86, i960 */
|
||
0x0FFC, /* m68k, mips, ppc, x86, i960 */
|
||
0x3000, /* ppc */
|
||
0x4FFC, /* m68k */
|
||
-1
|
||
};
|
||
|
||
#define CRASH_MAGIC 0xdead1234
|
||
#define MASK_ADDR(x) ((x) & 0x0fffffff) /* Mask crash info address */
|
||
|
||
typedef enum
|
||
{
|
||
CRASH_REASON_NOTCRASHED = 0,
|
||
CRASH_REASON_EXCEPTION = 1,
|
||
CRASH_REASON_CORRUPT = 2,
|
||
} crashreason;
|
||
|
||
typedef struct
|
||
{
|
||
char magic[4]; /* Magic number */
|
||
char version[4]; /* Version number */
|
||
char reason[4]; /* Crash reason */
|
||
char cpu_vector[4]; /* CPU vector for exceptions */
|
||
char registers[4]; /* Pointer to saved registers */
|
||
char rambase[4]; /* Base of RAM (not in V1 crash info) */
|
||
char textbase[4]; /* Base of .text section (not in V3 crash info) */
|
||
char database[4]; /* Base of .data section (not in V3 crash info) */
|
||
char bssbase[4]; /* Base of .bss section (not in V3 crash info) */
|
||
} crashinfo_external;
|
||
|
||
struct cisco_core_struct
|
||
{
|
||
int sig;
|
||
};
|
||
|
||
#define cisco_core_file_matches_executable_p generic_core_file_matches_executable_p
|
||
#define cisco_core_file_pid _bfd_nocore_core_file_pid
|
||
|
||
/* Examine the file for a crash info struct at the offset given by
|
||
CRASH_INFO_LOC. */
|
||
|
||
static const bfd_target *
|
||
cisco_core_file_validate (bfd *abfd, int crash_info_loc)
|
||
{
|
||
char buf[4];
|
||
unsigned int crashinfo_offset;
|
||
crashinfo_external crashinfo;
|
||
bfd_size_type nread;
|
||
unsigned int magic;
|
||
unsigned int version;
|
||
unsigned int rambase;
|
||
sec_ptr asect;
|
||
struct stat statbuf;
|
||
bfd_size_type amt;
|
||
flagword flags;
|
||
|
||
if (bfd_seek (abfd, (file_ptr) crash_info_loc, SEEK_SET) != 0)
|
||
return NULL;
|
||
|
||
nread = bfd_bread (buf, (bfd_size_type) 4, abfd);
|
||
if (nread != 4)
|
||
{
|
||
if (bfd_get_error () != bfd_error_system_call)
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
crashinfo_offset = MASK_ADDR (bfd_get_32 (abfd, buf));
|
||
|
||
if (bfd_seek (abfd, (file_ptr) crashinfo_offset, SEEK_SET) != 0)
|
||
{
|
||
/* Most likely we failed because of a bogus (huge) offset */
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
|
||
nread = bfd_bread (&crashinfo, (bfd_size_type) sizeof (crashinfo), abfd);
|
||
if (nread != sizeof (crashinfo))
|
||
{
|
||
if (bfd_get_error () != bfd_error_system_call)
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
|
||
if (bfd_stat (abfd, &statbuf) < 0)
|
||
{
|
||
bfd_set_error (bfd_error_system_call);
|
||
return NULL;
|
||
}
|
||
|
||
magic = bfd_get_32 (abfd, crashinfo.magic);
|
||
if (magic != CRASH_MAGIC)
|
||
{
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
|
||
version = bfd_get_32 (abfd, crashinfo.version);
|
||
if (version == 0)
|
||
{
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
else if (version == 1)
|
||
{
|
||
/* V1 core dumps don't specify the dump base, assume 0 */
|
||
rambase = 0;
|
||
}
|
||
else
|
||
{
|
||
rambase = bfd_get_32 (abfd, crashinfo.rambase);
|
||
}
|
||
|
||
/* OK, we believe you. You're a core file. */
|
||
|
||
amt = sizeof (struct cisco_core_struct);
|
||
abfd->tdata.cisco_core_data = (struct cisco_core_struct *) bfd_zmalloc (amt);
|
||
if (abfd->tdata.cisco_core_data == NULL)
|
||
return NULL;
|
||
|
||
switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason))
|
||
{
|
||
case CRASH_REASON_NOTCRASHED:
|
||
/* Crash file probably came from write core. */
|
||
abfd->tdata.cisco_core_data->sig = 0;
|
||
break;
|
||
case CRASH_REASON_CORRUPT:
|
||
/* The crash context area was corrupt -- proceed with caution.
|
||
We have no way of passing this information back to the caller. */
|
||
abfd->tdata.cisco_core_data->sig = 0;
|
||
break;
|
||
case CRASH_REASON_EXCEPTION:
|
||
/* Crash occured due to CPU exception. */
|
||
|
||
/* This is 68k-specific; for MIPS we'll need to interpret
|
||
cpu_vector differently based on the target configuration
|
||
(since CISCO core files don't seem to have the processor
|
||
encoded in them). */
|
||
|
||
switch (bfd_get_32 (abfd, crashinfo.cpu_vector))
|
||
{
|
||
/* bus error */
|
||
case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
|
||
/* address error */
|
||
case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
|
||
/* illegal instruction */
|
||
case 4 : abfd->tdata.cisco_core_data->sig = SIGILL; break;
|
||
/* zero divide */
|
||
case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* chk instruction */
|
||
case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* trapv instruction */
|
||
case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* privilege violation */
|
||
case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break;
|
||
/* trace trap */
|
||
case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP; break;
|
||
/* line 1010 emulator */
|
||
case 10: abfd->tdata.cisco_core_data->sig = SIGILL; break;
|
||
/* line 1111 emulator */
|
||
case 11: abfd->tdata.cisco_core_data->sig = SIGILL; break;
|
||
|
||
/* Coprocessor protocol violation. Using a standard MMU or FPU
|
||
this cannot be triggered by software. Call it a SIGBUS. */
|
||
case 13: abfd->tdata.cisco_core_data->sig = SIGBUS; break;
|
||
|
||
/* interrupt */
|
||
case 31: abfd->tdata.cisco_core_data->sig = SIGINT; break;
|
||
/* breakpoint */
|
||
case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP; break;
|
||
|
||
/* floating point err */
|
||
case 48: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* floating point err */
|
||
case 49: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* zero divide */
|
||
case 50: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* underflow */
|
||
case 51: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* operand error */
|
||
case 52: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* overflow */
|
||
case 53: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
/* NAN */
|
||
case 54: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
|
||
default:
|
||
#ifndef SIGEMT
|
||
#define SIGEMT SIGTRAP
|
||
#endif
|
||
/* "software generated"*/
|
||
abfd->tdata.cisco_core_data->sig = SIGEMT;
|
||
}
|
||
break;
|
||
default:
|
||
/* Unknown crash reason. */
|
||
abfd->tdata.cisco_core_data->sig = 0;
|
||
break;
|
||
}
|
||
|
||
/* Create a ".data" section that maps the entire file, which is
|
||
essentially a dump of the target system's RAM. */
|
||
|
||
flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
|
||
asect = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
|
||
if (asect == NULL)
|
||
goto error_return;
|
||
/* The size of memory is the size of the core file itself. */
|
||
asect->size = statbuf.st_size;
|
||
asect->vma = rambase;
|
||
asect->filepos = 0;
|
||
|
||
/* Create a ".crash" section to allow access to the saved
|
||
crash information. */
|
||
|
||
flags = SEC_HAS_CONTENTS;
|
||
asect = bfd_make_section_anyway_with_flags (abfd, ".crash", flags);
|
||
if (asect == NULL)
|
||
goto error_return;
|
||
asect->vma = 0;
|
||
asect->filepos = crashinfo_offset;
|
||
asect->size = sizeof (crashinfo);
|
||
|
||
/* Create a ".reg" section to allow access to the saved
|
||
registers. */
|
||
|
||
asect = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
|
||
if (asect == NULL)
|
||
goto error_return;
|
||
asect->vma = 0;
|
||
asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase;
|
||
/* Since we don't know the exact size of the saved register info,
|
||
choose a register section size that is either the remaining part
|
||
of the file, or 1024, whichever is smaller. */
|
||
nread = statbuf.st_size - asect->filepos;
|
||
asect->size = (nread < 1024) ? nread : 1024;
|
||
|
||
return abfd->xvec;
|
||
|
||
/* Get here if we have already started filling out the BFD
|
||
and there is an error of some kind. */
|
||
|
||
error_return:
|
||
bfd_release (abfd, abfd->tdata.any);
|
||
abfd->tdata.any = NULL;
|
||
bfd_section_list_clear (abfd);
|
||
return NULL;
|
||
}
|
||
|
||
static const bfd_target *
|
||
cisco_core_file_p (bfd *abfd)
|
||
{
|
||
int *crash_info_locp;
|
||
const bfd_target *target = NULL;
|
||
|
||
for (crash_info_locp = crash_info_locs;
|
||
*crash_info_locp != -1 && target == NULL;
|
||
crash_info_locp++)
|
||
{
|
||
target = cisco_core_file_validate (abfd, *crash_info_locp);
|
||
}
|
||
return (target);
|
||
}
|
||
|
||
static char *
|
||
cisco_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
|
||
{
|
||
return NULL;
|
||
}
|
||
|
||
static int
|
||
cisco_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
|
||
{
|
||
return abfd->tdata.cisco_core_data->sig;
|
||
}
|
||
|
||
extern const bfd_target core_cisco_le_vec;
|
||
|
||
const bfd_target core_cisco_be_vec =
|
||
{
|
||
"cisco-ios-core-big",
|
||
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 */
|
||
0, /* match priority. */
|
||
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
||
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
||
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
|
||
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
||
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
||
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
|
||
|
||
{ /* bfd_check_format */
|
||
_bfd_dummy_target, /* unknown format */
|
||
_bfd_dummy_target, /* object file */
|
||
_bfd_dummy_target, /* archive */
|
||
cisco_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 (cisco),
|
||
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),
|
||
|
||
& core_cisco_le_vec,
|
||
|
||
NULL /* backend_data */
|
||
};
|
||
|
||
const bfd_target core_cisco_le_vec =
|
||
{
|
||
"cisco-ios-core-little",
|
||
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 */
|
||
0, /* match_priority */
|
||
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
||
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
||
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
|
||
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
||
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
||
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
|
||
|
||
{ /* bfd_check_format */
|
||
_bfd_dummy_target, /* unknown format */
|
||
_bfd_dummy_target, /* object file */
|
||
_bfd_dummy_target, /* archive */
|
||
cisco_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 (cisco),
|
||
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),
|
||
|
||
&core_cisco_be_vec,
|
||
|
||
NULL /* backend_data */
|
||
};
|