+/* BFD back-end for CISCO crash dumps.
+ Copyright (C) 1994-2022 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
+\f
+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
+\f
+/* Examine the file for a crash info struct at the offset given by
+ CRASH_INFO_LOC. */
+
+static bfd_cleanup
+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;
+ size_t 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 _bfd_no_cleanup;
+
+ /* 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 bfd_cleanup
+cisco_core_file_p (bfd *abfd)
+{
+ int *crash_info_locp;
+ bfd_cleanup cleanup = NULL;
+
+ for (crash_info_locp = crash_info_locs;
+ *crash_info_locp != -1 && cleanup == NULL;
+ crash_info_locp++)
+ {
+ cleanup = cisco_core_file_validate (abfd, *crash_info_locp);
+ }
+ return cleanup;
+}
+
+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;
+}
+\f
+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. */
+ TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
+ 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_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error
+ },
+ { /* bfd_write_contents */
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error
+ },
+
+ 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 */
+ TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
+ 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_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error
+ },
+ { /* bfd_write_contents */
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error,
+ _bfd_bool_bfd_false_error
+ },
+
+ 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 */
+};
projects / thirdparty / binutils-gdb.git / blobdiff