/* ELF core file support for BFD.
- Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003
- Free Software Foundation, Inc.
+ Copyright (C) 1995-2020 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 2 of the License, or
+ 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,
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
char*
elf_core_file_failing_command (bfd *abfd)
{
- return elf_tdata (abfd)->core_command;
+ return elf_tdata (abfd)->core->command;
}
int
elf_core_file_failing_signal (bfd *abfd)
{
- return elf_tdata (abfd)->core_signal;
+ return elf_tdata (abfd)->core->signal;
+}
+
+int
+elf_core_file_pid (bfd *abfd)
+{
+ return elf_tdata (abfd)->core->pid;
}
bfd_boolean
return FALSE;
}
+ /* If both BFDs have identical build-ids, then they match. */
+ if (core_bfd->build_id != NULL
+ && exec_bfd->build_id != NULL
+ && core_bfd->build_id->size == exec_bfd->build_id->size
+ && memcmp (core_bfd->build_id->data, exec_bfd->build_id->data,
+ core_bfd->build_id->size) == 0)
+ return TRUE;
+
/* See if the name in the corefile matches the executable name. */
- corename = elf_tdata (core_bfd)->core_program;
+ corename = elf_tdata (core_bfd)->core->program;
if (corename != NULL)
{
- const char* execname = strrchr (exec_bfd->filename, '/');
+ const char* execname = strrchr (bfd_get_filename (exec_bfd), '/');
- execname = execname ? execname + 1 : exec_bfd->filename;
+ execname = execname ? execname + 1 : bfd_get_filename (exec_bfd);
if (strcmp (execname, corename) != 0)
return FALSE;
that allow standard bfd access to the general registers (.reg) and the
floating point registers (.reg2). */
-const bfd_target *
+bfd_cleanup
elf_core_file_p (bfd *abfd)
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */
Elf_Internal_Phdr *i_phdrp; /* Elf program header, internal form. */
unsigned int phindex;
const struct elf_backend_data *ebd;
- struct bfd_preserve preserve;
bfd_size_type amt;
- preserve.marker = NULL;
-
/* Read in the ELF header in external format. */
if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr))
{
goto wrong;
}
- if (!bfd_preserve_save (abfd, &preserve))
- goto fail;
-
/* Give abfd an elf_obj_tdata. */
if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd))
goto fail;
- preserve.marker = elf_tdata (abfd);
/* Swap in the rest of the header, now that we have the byte order. */
i_ehdrp = elf_elfheader (abfd);
if ((*target_ptr)->flavour != bfd_target_elf_flavour)
continue;
- back = (const struct elf_backend_data *) (*target_ptr)->backend_data;
+ back = xvec_get_elf_backend_data (*target_ptr);
+ if (back->s->arch_size != ARCH_SIZE)
+ continue;
if (back->elf_machine_code == i_ehdrp->e_machine
|| (back->elf_machine_alt1 != 0
- && i_ehdrp->e_machine == back->elf_machine_alt1)
+ && i_ehdrp->e_machine == back->elf_machine_alt1)
|| (back->elf_machine_alt2 != 0
- && i_ehdrp->e_machine == back->elf_machine_alt2))
+ && i_ehdrp->e_machine == back->elf_machine_alt2))
{
/* target_ptr is an ELF backend which matches this
object file, so reject the generic ELF target. */
if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr))
goto wrong;
+ /* If the program header count is PN_XNUM(0xffff), the actual
+ count is in the first section header. */
+ if (i_ehdrp->e_shoff != 0 && i_ehdrp->e_phnum == PN_XNUM)
+ {
+ Elf_External_Shdr x_shdr;
+ Elf_Internal_Shdr i_shdr;
+ file_ptr where = (file_ptr) i_ehdrp->e_shoff;
+
+ /* Seek to the section header table in the file. */
+ if (bfd_seek (abfd, where, SEEK_SET) != 0)
+ goto fail;
+
+ /* Read the first section header at index 0, and convert to internal
+ form. */
+ if (bfd_bread (&x_shdr, sizeof (x_shdr), abfd) != sizeof (x_shdr))
+ goto fail;
+ elf_swap_shdr_in (abfd, &x_shdr, &i_shdr);
+
+ if (i_shdr.sh_info != 0)
+ {
+ i_ehdrp->e_phnum = i_shdr.sh_info;
+ if (i_ehdrp->e_phnum != i_shdr.sh_info)
+ goto wrong;
+ }
+ }
+
+ /* Sanity check that we can read all of the program headers.
+ It ought to be good enough to just read the last one. */
+ if (i_ehdrp->e_phnum > 1)
+ {
+ Elf_External_Phdr x_phdr;
+ Elf_Internal_Phdr i_phdr;
+ file_ptr where;
+
+ /* Check that we don't have a totally silly number of
+ program headers. */
+ if (i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (x_phdr)
+ || i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (i_phdr))
+ goto wrong;
+
+ where = (file_ptr)(i_ehdrp->e_phoff + (i_ehdrp->e_phnum - 1) * sizeof (x_phdr));
+ if ((bfd_size_type) where <= i_ehdrp->e_phoff)
+ goto wrong;
+
+ if (bfd_seek (abfd, where, SEEK_SET) != 0)
+ goto fail;
+ if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr))
+ goto fail;
+ }
+
/* Move to the start of the program headers. */
if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0)
goto wrong;
/* Allocate space for the program headers. */
amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum;
- i_phdrp = bfd_alloc (abfd, amt);
+ i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
if (!i_phdrp)
goto fail;
if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex))
goto fail;
+ /* Check for core truncation. */
+ {
+ bfd_size_type high = 0;
+ struct stat statbuf;
+ for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
+ {
+ Elf_Internal_Phdr *p = i_phdrp + phindex;
+ if (p->p_filesz)
+ {
+ bfd_size_type current = p->p_offset + p->p_filesz;
+ if (high < current)
+ high = current;
+ }
+ }
+ if (bfd_stat (abfd, &statbuf) == 0)
+ {
+ if ((bfd_size_type) statbuf.st_size < high)
+ {
+ _bfd_error_handler
+ /* xgettext:c-format */
+ (_("warning: %pB is truncated: expected core file "
+ "size >= %" PRIu64 ", found: %" PRIu64),
+ abfd, (uint64_t) high, (uint64_t) statbuf.st_size);
+ }
+ }
+ }
+
/* Save the entry point from the ELF header. */
- bfd_get_start_address (abfd) = i_ehdrp->e_entry;
-
- bfd_preserve_finish (abfd, &preserve);
- return abfd->xvec;
-
-wrong:
- /* There is way too much undoing of half-known state here. The caller,
- bfd_check_format_matches, really shouldn't iterate on live bfd's to
- check match/no-match like it does. We have to rely on that a call to
- bfd_default_set_arch_mach with the previously known mach, undoes what
- was done by the first bfd_default_set_arch_mach (with mach 0) here.
- For this to work, only elf-data and the mach may be changed by the
- target-specific elf_backend_object_p function. Note that saving the
- whole bfd here and restoring it would be even worse; the first thing
- you notice is that the cached bfd file position gets out of sync. */
- bfd_set_error (bfd_error_wrong_format);
+ abfd->start_address = i_ehdrp->e_entry;
+ return _bfd_no_cleanup;
-fail:
- if (preserve.marker != NULL)
- bfd_preserve_restore (abfd, &preserve);
+ wrong:
+ bfd_set_error (bfd_error_wrong_format);
+ fail:
return NULL;
}
+
+/* Attempt to find a build-id in a core file from the core file BFD.
+ OFFSET is the file offset to a PT_LOAD segment that may contain
+ the build-id note. Returns TRUE upon success, FALSE otherwise. */
+
+bfd_boolean
+NAME(_bfd_elf, core_find_build_id)
+ (bfd *abfd,
+ bfd_vma offset)
+{
+ Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */
+ Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form. */
+ Elf_Internal_Phdr *i_phdr;
+ unsigned int i;
+ size_t amt;
+
+ /* Seek to the position of the segment at OFFSET. */
+ if (bfd_seek (abfd, offset, SEEK_SET) != 0)
+ goto fail;
+
+ /* Read in the ELF header in external format. */
+ if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr))
+ {
+ if (bfd_get_error () != bfd_error_system_call)
+ goto wrong;
+ else
+ goto fail;
+ }
+
+ /* Now check to see if we have a valid ELF file, and one that BFD can
+ make use of. The magic number must match, the address size ('class')
+ and byte-swapping must match our XVEC entry, and it must have a
+ section header table (FIXME: See comments re sections at top of this
+ file). */
+ if (! elf_file_p (&x_ehdr)
+ || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT
+ || x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
+ goto wrong;
+
+ /* Check that file's byte order matches xvec's. */
+ switch (x_ehdr.e_ident[EI_DATA])
+ {
+ case ELFDATA2MSB: /* Big-endian. */
+ if (! bfd_header_big_endian (abfd))
+ goto wrong;
+ break;
+ case ELFDATA2LSB: /* Little-endian. */
+ if (! bfd_header_little_endian (abfd))
+ goto wrong;
+ break;
+ case ELFDATANONE: /* No data encoding specified. */
+ default: /* Unknown data encoding specified . */
+ goto wrong;
+ }
+
+ elf_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
+#if DEBUG
+ elf_debug_file (&i_ehdr);
+#endif
+
+ if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0)
+ goto fail;
+
+ /* Read in program headers. */
+ if (_bfd_mul_overflow (i_ehdr.e_phnum, sizeof (*i_phdr), &amt))
+ {
+ bfd_set_error (bfd_error_file_too_big);
+ goto fail;
+ }
+ i_phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
+ if (i_phdr == NULL)
+ goto fail;
+
+ if (bfd_seek (abfd, (file_ptr) (offset + i_ehdr.e_phoff), SEEK_SET) != 0)
+ goto fail;
+
+ /* Read in program headers and parse notes. */
+ for (i = 0; i < i_ehdr.e_phnum; ++i, ++i_phdr)
+ {
+ Elf_External_Phdr x_phdr;
+
+ if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr))
+ goto fail;
+ elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
+
+ if (i_phdr->p_type == PT_NOTE && i_phdr->p_filesz > 0)
+ {
+ elf_read_notes (abfd, offset + i_phdr->p_offset,
+ i_phdr->p_filesz, i_phdr->p_align);
+ if (abfd->build_id != NULL)
+ return TRUE;
+ }
+ }
+
+ /* Having gotten this far, we have a valid ELF section, but no
+ build-id was found. */
+ goto fail;
+
+ wrong:
+ bfd_set_error (bfd_error_wrong_format);
+ fail:
+ return FALSE;
+}
projects / deliverable / binutils-gdb.git / blobdiff