/* ELF core file support for BFD.
- Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002
- 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.
+ 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. */
+ 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;
}
-boolean
-elf_core_file_matches_executable_p (core_bfd, exec_bfd)
- bfd *core_bfd;
- bfd *exec_bfd;
+int
+elf_core_file_pid (bfd *abfd)
+{
+ return elf_tdata (abfd)->core->pid;
+}
+
+bfd_boolean
+elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
{
char* corename;
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), '/');
- if (strcmp(execname, corename) != 0)
- return false;
+ execname = execname ? execname + 1 : bfd_get_filename (exec_bfd);
+
+ if (strcmp (execname, corename) != 0)
+ return FALSE;
}
- return true;
+ return TRUE;
}
/* Core files are simply standard ELF formatted files that partition
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; /* 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 bfd_preserve preserve;
- struct elf_obj_tdata *new_tdata = NULL;
+ const struct elf_backend_data *ebd;
bfd_size_type amt;
- preserve.arch_info = abfd->arch_info;
-
/* Read in the ELF header in external format. */
- if (bfd_bread ((PTR) &x_ehdr, (bfd_size_type) sizeof (x_ehdr), 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))
goto wrong;
- /* FIXME: Check EI_VERSION here ! */
+ /* FIXME: Check EI_VERSION here ! */
/* Check the address size ("class"). */
if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
/* 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;
}
/* Give abfd an elf_obj_tdata. */
- amt = sizeof (struct elf_obj_tdata);
- new_tdata = (struct elf_obj_tdata *) bfd_zalloc (abfd, amt);
- if (new_tdata == NULL)
- return NULL;
- preserve.tdata = elf_tdata (abfd);
- elf_tdata (abfd) = new_tdata;
-
- /* Clear section information, since there might be a recognized bfd that
- we now check if we can replace, and we don't want to append to it. */
- preserve.sections = abfd->sections;
- preserve.section_tail = abfd->section_tail;
- preserve.section_count = abfd->section_count;
- preserve.section_htab = abfd->section_htab;
- abfd->sections = NULL;
- abfd->section_tail = &abfd->sections;
- abfd->section_count = 0;
- if (!bfd_hash_table_init (&abfd->section_htab, bfd_section_hash_newfunc))
+ 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. */
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 (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;
for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
{
Elf_External_Phdr x_phdr;
- if (bfd_bread ((PTR) &x_phdr, (bfd_size_type) sizeof (x_phdr), 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);
/* 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))
- {
+ if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)
/* It's OK if this fails for the generic target. */
- if (ebd->elf_machine_code != EM_NONE)
- goto fail;
- }
+ && 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_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex))
+ if (bfd_get_error () != bfd_error_system_call)
+ goto wrong;
+ else
goto fail;
}
- /* Save the entry point from the ELF header. */
- bfd_get_start_address (abfd) = i_ehdrp->e_entry;
+ /* 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;
- /* Let the backend double check the format and override global
- information. */
- if (ebd->elf_backend_object_p)
+ /* Check that file's byte order matches xvec's. */
+ switch (x_ehdr.e_ident[EI_DATA])
{
- if (! (*ebd->elf_backend_object_p) (abfd))
+ 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;
}
- bfd_hash_table_free (&preserve.section_htab);
- 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);
+ elf_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
+#if DEBUG
+ elf_debug_file (&i_ehdr);
+#endif
-fail:
- abfd->arch_info = preserve.arch_info;
- if (new_tdata != NULL)
+ 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_release frees all memory more recently bfd_alloc'd than
- its arg, as well as its arg. */
- bfd_release (abfd, new_tdata);
- elf_tdata (abfd) = preserve.tdata;
- abfd->section_htab = preserve.section_htab;
- abfd->sections = preserve.sections;
- abfd->section_tail = preserve.section_tail;
- abfd->section_count = preserve.section_count;
+ bfd_set_error (bfd_error_file_too_big);
+ goto fail;
}
- return NULL;
+ 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