/* ELF core file support for BFD.
- Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1995-2020 Free Software Foundation, Inc.
-This file is part of BFD, the Binary File Descriptor library.
+ 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
-(at your option) any later version.
+ 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ 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. */
char*
-elf_core_file_failing_command (abfd)
- bfd *abfd;
+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 (abfd)
- bfd *abfd;
+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;
+}
-boolean
-elf_core_file_matches_executable_p (core_bfd, exec_bfd)
- bfd *core_bfd;
- bfd *exec_bfd;
+bfd_boolean
+elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
{
char* corename;
- /* xvecs must match if both are ELF files for the same target. */
+ /* xvecs must match if both are ELF files for the same target. */
if (core_bfd->xvec != exec_bfd->xvec)
{
bfd_set_error (bfd_error_system_call);
- return false;
+ return FALSE;
}
- /* See if the name in the corefile matches the executable name. */
+ /* 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;
- corename = elf_tdata (core_bfd)->core_program;
+ /* See if the name in the corefile matches the executable name. */
+ corename = elf_tdata (core_bfd)->core->program;
if (corename != NULL)
{
- const char* execname = strrchr (exec_bfd->filename, '/');
- execname = execname ? execname + 1 : exec_bfd->filename;
+ const char* execname = strrchr (bfd_get_filename (exec_bfd), '/');
+
+ execname = execname ? execname + 1 : bfd_get_filename (exec_bfd);
- if (strcmp(execname, corename) != 0)
- return false;
+ if (strcmp (execname, corename) != 0)
+ return FALSE;
}
- return true;
+ return TRUE;
}
-
/* Core files are simply standard ELF formatted files that partition
the file using the execution view of the file (program header table)
rather than the linking view. In fact, there is no section header
register set) and the floating point register set are stored in a
segment of type PT_NOTE. We handcraft a couple of extra bfd sections
that allow standard bfd access to the general registers (.reg) and the
- floating point registers (.reg2).
+ floating point registers (.reg2). */
- */
-
-const bfd_target *
-elf_core_file_p (abfd)
- bfd *abfd;
+bfd_cleanup
+elf_core_file_p (bfd *abfd)
{
- Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
- Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
- Elf_Internal_Phdr *i_phdrp = NULL; /* Elf program header, internal form */
+ Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */
+ Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form. */
+ Elf_Internal_Phdr *i_phdrp; /* Elf program header, internal form. */
unsigned int phindex;
- struct elf_backend_data *ebd;
- struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
- struct elf_obj_tdata *new_tdata = NULL;
+ const struct elf_backend_data *ebd;
+ bfd_size_type amt;
/* Read in the ELF header in external format. */
- if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
+ if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr))
{
if (bfd_get_error () != bfd_error_system_call)
- bfd_set_error (bfd_error_wrong_format);
- return NULL;
+ goto wrong;
+ else
+ goto fail;
}
- /* Check the magic number. */
- if (elf_file_p (&x_ehdr) == false)
+ /* Check the magic number. */
+ if (! elf_file_p (&x_ehdr))
goto wrong;
- /* FIXME: Check EI_VERSION here ! */
+ /* FIXME: Check EI_VERSION here ! */
- /* Check the address size ("class"). */
+ /* Check the address size ("class"). */
if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
goto wrong;
- /* Check the byteorder. */
+ /* Check the byteorder. */
switch (x_ehdr.e_ident[EI_DATA])
{
- case ELFDATA2MSB: /* Big-endian */
+ case ELFDATA2MSB: /* Big-endian. */
if (! bfd_big_endian (abfd))
goto wrong;
break;
- case ELFDATA2LSB: /* Little-endian */
+ case ELFDATA2LSB: /* Little-endian. */
if (! bfd_little_endian (abfd))
goto wrong;
break;
goto wrong;
}
- /* Give abfd an elf_obj_tdata. */
- new_tdata =
- (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata));
- if (new_tdata == NULL)
- return NULL;
- elf_tdata (abfd) = new_tdata;
+ /* Give abfd an elf_obj_tdata. */
+ if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd))
+ goto fail;
- /* Swap in the rest of the header, now that we have the byte order. */
+ /* Swap in the rest of the header, now that we have the byte order. */
i_ehdrp = elf_elfheader (abfd);
elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
{
- struct elf_backend_data *back;
+ const struct elf_backend_data *back;
if ((*target_ptr)->flavour != bfd_target_elf_flavour)
continue;
- back = (struct elf_backend_data *) (*target_ptr)->backend_data;
- if (back->elf_machine_code == i_ehdrp->e_machine)
+ 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)
+ || (back->elf_machine_alt2 != 0
+ && 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 there is no program header, or the type is not a core file, then
- we are hosed. */
+ we are hosed. */
if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE)
goto wrong;
if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr))
goto wrong;
- /* Allocate space for the program headers. */
- i_phdrp = (Elf_Internal_Phdr *)
- bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum);
+ /* 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 = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
if (!i_phdrp)
goto fail;
elf_tdata (abfd)->phdr = i_phdrp;
- /* Read and convert to internal form. */
+ /* Read and convert to internal form. */
for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
{
Elf_External_Phdr x_phdr;
- if (bfd_read ((PTR) &x_phdr, sizeof (x_phdr), 1, abfd)
- != sizeof (x_phdr))
+
+ if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr))
goto fail;
elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);
}
- /* Process each program header. */
+ /* Set the machine architecture. Do this before processing the
+ program headers since we need to know the architecture type
+ when processing the notes of some systems' core files. */
+ if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)
+ /* It's OK if this fails for the generic target. */
+ && ebd->elf_machine_code != EM_NONE)
+ goto fail;
+
+ /* Let the backend double check the format and override global
+ information. We do this before processing the program headers
+ to allow the correct machine (as opposed to just the default
+ machine) to be set, making it possible for grok_prstatus and
+ grok_psinfo to rely on the mach setting. */
+ if (ebd->elf_backend_object_p != NULL
+ && ! ebd->elf_backend_object_p (abfd))
+ goto wrong;
+
+ /* Process each program header. */
for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
+ 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. */
+ abfd->start_address = i_ehdrp->e_entry;
+ return _bfd_no_cleanup;
+
+ 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_elfcore_section_from_phdr (abfd, i_phdrp + phindex, phindex))
+ if (bfd_get_error () != bfd_error_system_call)
+ goto wrong;
+ else
goto fail;
}
- /* Set the machine architecture. */
- if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
+ /* 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])
{
- /* It's OK if this fails for the generic target. */
- if (ebd->elf_machine_code != EM_NONE)
- goto fail;
+ 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;
}
- /* Save the entry point from the ELF header. */
- bfd_get_start_address (abfd) = i_ehdrp->e_entry;
+ elf_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
+#if DEBUG
+ elf_debug_file (&i_ehdr);
+#endif
- /* Let the backend double check the format and override global
- information. */
- if (ebd->elf_backend_object_p)
+ 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))
{
- if ((*ebd->elf_backend_object_p) (abfd) == false)
- goto wrong;
+ 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;
+ }
}
- return abfd->xvec;
+ /* Having gotten this far, we have a valid ELF section, but no
+ build-id was found. */
+ goto fail;
-wrong:
+ wrong:
bfd_set_error (bfd_error_wrong_format);
-fail:
- if (i_phdrp != NULL)
- bfd_release (abfd, i_phdrp);
- if (new_tdata != NULL)
- bfd_release (abfd, new_tdata);
- elf_tdata (abfd) = preserved_tdata;
- return NULL;
+ fail:
+ return FALSE;
}
projects / deliverable / binutils-gdb.git / blobdiff