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- /* BFD back end for traditional Unix core files (U-area and raw sections)
- Copyright (C) 1988-2022 Free Software Foundation, Inc.
- Written by John Gilmore of Cygnus Support.
- 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"
- #include "libaout.h" /* BFD a.out internal data structures */
- #include <sys/param.h>
- #include <dirent.h>
- #include <signal.h>
- #include <sys/user.h> /* After a.out.h */
- #ifdef TRAD_HEADER
- #include TRAD_HEADER
- #endif
- #ifndef NBPG
- # define NBPG getpagesize()
- #endif
- struct trad_core_struct
- {
- asection *data_section;
- asection *stack_section;
- asection *reg_section;
- struct 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 */
- #define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
- #define trad_unix_core_file_pid _bfd_nocore_core_file_pid
- /* Handle 4.2-style (and perhaps also sysV-style) core dump file. */
- static bfd_cleanup
- trad_unix_core_file_p (bfd *abfd)
- {
- int val;
- struct user u;
- struct trad_core_struct *rawptr;
- size_t amt;
- flagword flags;
- #ifdef TRAD_CORE_USER_OFFSET
- /* If defined, this macro is the file position of the user struct. */
- if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
- return 0;
- #endif
- val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
- if (val != sizeof u)
- {
- /* Too small to be a core file */
- bfd_set_error (bfd_error_wrong_format);
- return 0;
- }
- /* Sanity check perhaps??? */
- if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */
- {
- bfd_set_error (bfd_error_wrong_format);
- return 0;
- }
- if (u.u_ssize > 0x1000000)
- {
- bfd_set_error (bfd_error_wrong_format);
- return 0;
- }
- /* Check that the size claimed is no greater than the file size. */
- {
- struct stat statbuf;
- if (bfd_stat (abfd, &statbuf) < 0)
- return 0;
- if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize
- #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
- - u.u_tsize
- #endif
- + u.u_ssize)
- > (ufile_ptr) statbuf.st_size)
- {
- bfd_set_error (bfd_error_wrong_format);
- return 0;
- }
- #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
- if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize)
- #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
- /* Some systems write the file too big. */
- + TRAD_CORE_EXTRA_SIZE_ALLOWED
- #endif
- )
- < (ufile_ptr) statbuf.st_size)
- {
- /* The file is too big. Maybe it's not a core file
- or we otherwise have bad values for u_dsize and u_ssize). */
- bfd_set_error (bfd_error_wrong_format);
- return 0;
- }
- #endif
- }
- /* 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_zmalloc (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;
- core_datasec (abfd)->size = NBPG * u.u_dsize
- #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
- - NBPG * u.u_tsize
- #endif
- ;
- 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. */
- #ifdef HOST_DATA_START_ADDR
- core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
- #else
- core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
- #endif
- #ifdef HOST_STACK_START_ADDR
- core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
- #else
- core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
- #endif
- /* This is tricky. As the "register section", we give them the entire
- upage and stack. u.u_ar0 points to where "register 0" is stored.
- There are two tricks with this, though. One is that the rest of the
- registers might be at positive or negative (or both) displacements
- from *u_ar0. The other is that u_ar0 is sometimes an absolute address
- in kernel memory, and on other systems it is an offset from the beginning
- of the `struct user'.
- As a practical matter, we don't know where the registers actually are,
- so we have to pass the whole area to GDB. We encode the value of u_ar0
- by setting the .regs section up so that its virtual memory address
- 0 is at the place pointed to by u_ar0 (by setting the vma of the start
- of the section to -u_ar0). GDB uses this info to locate the regs,
- using minor trickery to get around the offset-or-absolute-addr problem. */
- core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
- core_datasec (abfd)->filepos = NBPG * UPAGES;
- core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
- #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
- - NBPG * u.u_tsize
- #endif
- ;
- 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;
- return _bfd_no_cleanup;
- fail:
- bfd_release (abfd, abfd->tdata.any);
- abfd->tdata.any = NULL;
- bfd_section_list_clear (abfd);
- return NULL;
- }
- static char *
- trad_unix_core_file_failing_command (bfd *abfd)
- {
- #ifndef NO_CORE_COMMAND
- char *com = abfd->tdata.trad_core_data->u.u_comm;
- if (*com)
- return com;
- else
- #endif
- return 0;
- }
- static int
- trad_unix_core_file_failing_signal (bfd *ignore_abfd ATTRIBUTE_UNUSED)
- {
- #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
- return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
- #else
- return -1; /* FIXME, where is it? */
- #endif
- }
- /* 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_trad_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 */
- 0, /* match priority. */
- TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
- 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 */
- trad_unix_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 (trad_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 */
- };
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