X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=bfd%2Felfcore.h;h=0339a671fc7fdb7371d3771581870a107ec00eeb;hb=f2e1c129f8f0985ec80e6cf775cf3e4afbced6fa;hp=81c4cff11393682e422117191edcf442af47e40a;hpb=9c5bfbb7fd76589a332126f99a4e195e46da207f;p=deliverable%2Fbinutils-gdb.git diff --git a/bfd/elfcore.h b/bfd/elfcore.h index 81c4cff113..0339a671fc 100644 --- a/bfd/elfcore.h +++ b/bfd/elfcore.h @@ -1,12 +1,11 @@ /* 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, @@ -16,18 +15,25 @@ 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 @@ -43,13 +49,21 @@ elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) 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; @@ -69,7 +83,7 @@ elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) 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. */ @@ -77,11 +91,8 @@ elf_core_file_p (bfd *abfd) 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)) { @@ -116,13 +127,9 @@ elf_core_file_p (bfd *abfd) 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); @@ -157,12 +164,14 @@ elf_core_file_p (bfd *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. */ @@ -181,13 +190,63 @@ elf_core_file_p (bfd *abfd) 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; @@ -207,44 +266,161 @@ elf_core_file_p (bfd *abfd) /* 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. */ - bfd_get_start_address (abfd) = i_ehdrp->e_entry; + abfd->start_address = i_ehdrp->e_entry; + return _bfd_no_cleanup; - /* Let the backend double check the format and override global - information. */ - if (ebd->elf_backend_object_p - && (! (*ebd->elf_backend_object_p) (abfd))) + 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; - 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); + /* 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; + } -fail: - if (preserve.marker != NULL) - bfd_preserve_restore (abfd, &preserve); - return NULL; + 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; }