419 lines
13 KiB
C
419 lines
13 KiB
C
/* BFD back-end for CISCO crash dumps.
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Copyright (C) 1994-2016 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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/* core_file_failing_signal returns a host signal (this probably should
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be fixed). */
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#include <signal.h>
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/* for MSVC builds */
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#ifndef SIGTRAP
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# define SIGTRAP 5
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#endif
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#ifndef SIGEMT
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# define SIGEMT 6
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#endif
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#ifndef SIGBUS
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# define SIGBUS 10
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#endif
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int crash_info_locs[] =
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{
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0x0250, /* mips, ppc, x86, i960 */
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0x0400, /* m68k, mips, x86, i960 */
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0x0FFC, /* m68k, mips, ppc, x86, i960 */
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0x3000, /* ppc */
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0x4FFC, /* m68k */
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-1
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};
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#define CRASH_MAGIC 0xdead1234
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#define MASK_ADDR(x) ((x) & 0x0fffffff) /* Mask crash info address */
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typedef enum
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{
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CRASH_REASON_NOTCRASHED = 0,
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CRASH_REASON_EXCEPTION = 1,
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CRASH_REASON_CORRUPT = 2,
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} crashreason;
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typedef struct
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{
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char magic[4]; /* Magic number */
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char version[4]; /* Version number */
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char reason[4]; /* Crash reason */
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char cpu_vector[4]; /* CPU vector for exceptions */
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char registers[4]; /* Pointer to saved registers */
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char rambase[4]; /* Base of RAM (not in V1 crash info) */
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char textbase[4]; /* Base of .text section (not in V3 crash info) */
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char database[4]; /* Base of .data section (not in V3 crash info) */
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char bssbase[4]; /* Base of .bss section (not in V3 crash info) */
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} crashinfo_external;
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struct cisco_core_struct
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{
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int sig;
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};
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#define cisco_core_file_matches_executable_p generic_core_file_matches_executable_p
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#define cisco_core_file_pid _bfd_nocore_core_file_pid
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/* Examine the file for a crash info struct at the offset given by
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CRASH_INFO_LOC. */
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static const bfd_target *
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cisco_core_file_validate (bfd *abfd, int crash_info_loc)
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{
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char buf[4];
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unsigned int crashinfo_offset;
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crashinfo_external crashinfo;
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bfd_size_type nread;
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unsigned int magic;
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unsigned int version;
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unsigned int rambase;
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sec_ptr asect;
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struct stat statbuf;
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bfd_size_type amt;
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flagword flags;
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if (bfd_seek (abfd, (file_ptr) crash_info_loc, SEEK_SET) != 0)
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return NULL;
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nread = bfd_bread (buf, (bfd_size_type) 4, abfd);
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if (nread != 4)
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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crashinfo_offset = MASK_ADDR (bfd_get_32 (abfd, buf));
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if (bfd_seek (abfd, (file_ptr) crashinfo_offset, SEEK_SET) != 0)
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{
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/* Most likely we failed because of a bogus (huge) offset */
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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nread = bfd_bread (&crashinfo, (bfd_size_type) sizeof (crashinfo), abfd);
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if (nread != sizeof (crashinfo))
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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if (bfd_stat (abfd, &statbuf) < 0)
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{
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bfd_set_error (bfd_error_system_call);
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return NULL;
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}
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magic = bfd_get_32 (abfd, crashinfo.magic);
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if (magic != CRASH_MAGIC)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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version = bfd_get_32 (abfd, crashinfo.version);
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if (version == 0)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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else if (version == 1)
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{
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/* V1 core dumps don't specify the dump base, assume 0 */
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rambase = 0;
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}
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else
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{
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rambase = bfd_get_32 (abfd, crashinfo.rambase);
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}
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/* OK, we believe you. You're a core file. */
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amt = sizeof (struct cisco_core_struct);
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abfd->tdata.cisco_core_data = (struct cisco_core_struct *) bfd_zmalloc (amt);
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if (abfd->tdata.cisco_core_data == NULL)
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return NULL;
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switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason))
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{
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case CRASH_REASON_NOTCRASHED:
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/* Crash file probably came from write core. */
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abfd->tdata.cisco_core_data->sig = 0;
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break;
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case CRASH_REASON_CORRUPT:
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/* The crash context area was corrupt -- proceed with caution.
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We have no way of passing this information back to the caller. */
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abfd->tdata.cisco_core_data->sig = 0;
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break;
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case CRASH_REASON_EXCEPTION:
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/* Crash occured due to CPU exception. */
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/* This is 68k-specific; for MIPS we'll need to interpret
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cpu_vector differently based on the target configuration
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(since CISCO core files don't seem to have the processor
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encoded in them). */
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switch (bfd_get_32 (abfd, crashinfo.cpu_vector))
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{
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/* bus error */
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case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
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/* address error */
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case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
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/* illegal instruction */
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case 4 : abfd->tdata.cisco_core_data->sig = SIGILL; break;
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/* zero divide */
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case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* chk instruction */
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case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* trapv instruction */
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case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* privilege violation */
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case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break;
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/* trace trap */
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case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP; break;
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/* line 1010 emulator */
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case 10: abfd->tdata.cisco_core_data->sig = SIGILL; break;
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/* line 1111 emulator */
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case 11: abfd->tdata.cisco_core_data->sig = SIGILL; break;
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/* Coprocessor protocol violation. Using a standard MMU or FPU
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this cannot be triggered by software. Call it a SIGBUS. */
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case 13: abfd->tdata.cisco_core_data->sig = SIGBUS; break;
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/* interrupt */
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case 31: abfd->tdata.cisco_core_data->sig = SIGINT; break;
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/* breakpoint */
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case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP; break;
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/* floating point err */
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case 48: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* floating point err */
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case 49: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* zero divide */
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case 50: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* underflow */
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case 51: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* operand error */
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case 52: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* overflow */
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case 53: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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/* NAN */
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case 54: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
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default:
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#ifndef SIGEMT
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#define SIGEMT SIGTRAP
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#endif
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/* "software generated"*/
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abfd->tdata.cisco_core_data->sig = SIGEMT;
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}
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break;
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default:
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/* Unknown crash reason. */
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abfd->tdata.cisco_core_data->sig = 0;
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break;
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}
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/* Create a ".data" section that maps the entire file, which is
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essentially a dump of the target system's RAM. */
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flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
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asect = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
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if (asect == NULL)
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goto error_return;
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/* The size of memory is the size of the core file itself. */
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asect->size = statbuf.st_size;
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asect->vma = rambase;
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asect->filepos = 0;
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/* Create a ".crash" section to allow access to the saved
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crash information. */
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flags = SEC_HAS_CONTENTS;
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asect = bfd_make_section_anyway_with_flags (abfd, ".crash", flags);
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if (asect == NULL)
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goto error_return;
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asect->vma = 0;
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asect->filepos = crashinfo_offset;
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asect->size = sizeof (crashinfo);
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/* Create a ".reg" section to allow access to the saved
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registers. */
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asect = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
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if (asect == NULL)
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goto error_return;
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asect->vma = 0;
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asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase;
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/* Since we don't know the exact size of the saved register info,
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choose a register section size that is either the remaining part
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of the file, or 1024, whichever is smaller. */
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nread = statbuf.st_size - asect->filepos;
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asect->size = (nread < 1024) ? nread : 1024;
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return abfd->xvec;
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/* Get here if we have already started filling out the BFD
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and there is an error of some kind. */
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error_return:
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bfd_release (abfd, abfd->tdata.any);
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abfd->tdata.any = NULL;
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bfd_section_list_clear (abfd);
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return NULL;
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}
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static const bfd_target *
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cisco_core_file_p (bfd *abfd)
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{
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int *crash_info_locp;
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const bfd_target *target = NULL;
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for (crash_info_locp = crash_info_locs;
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*crash_info_locp != -1 && target == NULL;
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crash_info_locp++)
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{
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target = cisco_core_file_validate (abfd, *crash_info_locp);
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}
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return (target);
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}
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static char *
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cisco_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
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{
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return NULL;
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}
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static int
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cisco_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
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{
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return abfd->tdata.cisco_core_data->sig;
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}
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extern const bfd_target core_cisco_le_vec;
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const bfd_target core_cisco_be_vec =
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{
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"cisco-ios-core-big",
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bfd_target_unknown_flavour,
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BFD_ENDIAN_BIG, /* target byte order */
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BFD_ENDIAN_BIG, /* target headers byte order */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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0, /* symbol prefix */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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0, /* match priority. */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
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{ /* bfd_check_format */
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_bfd_dummy_target, /* unknown format */
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_bfd_dummy_target, /* object file */
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_bfd_dummy_target, /* archive */
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cisco_core_file_p /* a core file */
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},
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{ /* bfd_set_format */
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bfd_false, bfd_false,
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bfd_false, bfd_false
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},
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{ /* bfd_write_contents */
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bfd_false, bfd_false,
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bfd_false, bfd_false
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},
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BFD_JUMP_TABLE_GENERIC (_bfd_generic),
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BFD_JUMP_TABLE_COPY (_bfd_generic),
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BFD_JUMP_TABLE_CORE (cisco),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
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BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
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BFD_JUMP_TABLE_WRITE (_bfd_generic),
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BFD_JUMP_TABLE_LINK (_bfd_nolink),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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& core_cisco_le_vec,
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NULL /* backend_data */
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};
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const bfd_target core_cisco_le_vec =
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{
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"cisco-ios-core-little",
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bfd_target_unknown_flavour,
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BFD_ENDIAN_LITTLE, /* target byte order */
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BFD_ENDIAN_LITTLE, /* target headers byte order */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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0, /* symbol prefix */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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0, /* match_priority */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
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{ /* bfd_check_format */
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_bfd_dummy_target, /* unknown format */
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_bfd_dummy_target, /* object file */
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_bfd_dummy_target, /* archive */
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cisco_core_file_p /* a core file */
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},
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{ /* bfd_set_format */
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bfd_false, bfd_false,
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bfd_false, bfd_false
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},
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{ /* bfd_write_contents */
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bfd_false, bfd_false,
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bfd_false, bfd_false
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},
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BFD_JUMP_TABLE_GENERIC (_bfd_generic),
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BFD_JUMP_TABLE_COPY (_bfd_generic),
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BFD_JUMP_TABLE_CORE (cisco),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
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BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
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BFD_JUMP_TABLE_WRITE (_bfd_generic),
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BFD_JUMP_TABLE_LINK (_bfd_nolink),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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&core_cisco_be_vec,
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NULL /* backend_data */
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};
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