diff options
Diffstat (limited to 'binutils-2.25/bfd/elfcore.h')
| -rw-r--r-- | binutils-2.25/bfd/elfcore.h | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elfcore.h b/binutils-2.25/bfd/elfcore.h new file mode 100644 index 00000000..429c09c7 --- /dev/null +++ b/binutils-2.25/bfd/elfcore.h @@ -0,0 +1,320 @@ +/* ELF core file support for BFD. + Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005, 2007, + 2008, 2010 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 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. */ + +char* +elf_core_file_failing_command (bfd *abfd) +{ + return elf_tdata (abfd)->core->command; +} + +int +elf_core_file_failing_signal (bfd *abfd) +{ + return elf_tdata (abfd)->core->signal; +} + +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; + + /* 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; + } + + /* 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; + + if (strcmp (execname, corename) != 0) + return FALSE; + } + + 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 + table in a core file. + + The process status information (including the contents of the general + 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). */ + +const bfd_target * +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. */ + unsigned int phindex; + const struct elf_backend_data *ebd; + bfd_size_type amt; + + /* 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; + } + + /* Check the magic number. */ + if (! elf_file_p (&x_ehdr)) + goto wrong; + + /* FIXME: Check EI_VERSION here ! */ + + /* Check the address size ("class"). */ + if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) + goto wrong; + + /* Check the byteorder. */ + switch (x_ehdr.e_ident[EI_DATA]) + { + case ELFDATA2MSB: /* Big-endian. */ + if (! bfd_big_endian (abfd)) + goto wrong; + break; + case ELFDATA2LSB: /* Little-endian. */ + if (! bfd_little_endian (abfd)) + goto wrong; + break; + default: + goto wrong; + } + + /* 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. */ + i_ehdrp = elf_elfheader (abfd); + elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); + +#if DEBUG & 1 + elf_debug_file (i_ehdrp); +#endif + + ebd = get_elf_backend_data (abfd); + + /* Check that the ELF e_machine field matches what this particular + BFD format expects. */ + + if (ebd->elf_machine_code != i_ehdrp->e_machine + && (ebd->elf_machine_alt1 == 0 + || i_ehdrp->e_machine != ebd->elf_machine_alt1) + && (ebd->elf_machine_alt2 == 0 + || i_ehdrp->e_machine != ebd->elf_machine_alt2)) + { + const bfd_target * const *target_ptr; + + if (ebd->elf_machine_code != EM_NONE) + goto wrong; + + /* This is the generic ELF target. Let it match any ELF target + for which we do not have a specific backend. */ + + for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) + { + const struct elf_backend_data *back; + + if ((*target_ptr)->flavour != bfd_target_elf_flavour) + continue; + 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. */ + goto wrong; + } + } + } + + /* If there is no program header, or the type is not a core file, then + we are hosed. */ + if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) + goto wrong; + + /* Does BFD's idea of the phdr size match the size + recorded in the file? */ + 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; + bfd_signed_vma where = i_ehdrp->e_shoff; + + if (where != (file_ptr) where) + goto wrong; + + /* Seek to the section header table in the file. */ + if (bfd_seek (abfd, (file_ptr) 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; + bfd_signed_vma 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 = i_ehdrp->e_phoff + (i_ehdrp->e_phnum - 1) * sizeof (x_phdr); + if (where != (file_ptr) where) + goto wrong; + if ((bfd_size_type) where <= i_ehdrp->e_phoff) + goto wrong; + + if (bfd_seek (abfd, (file_ptr) 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. */ + for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) + { + 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_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) + /* 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) + (_("Warning: %B is truncated: expected core file " + "size >= %lu, found: %lu."), + abfd, (unsigned long) high, (unsigned long) statbuf.st_size); + } + } + } + + /* Save the entry point from the ELF header. */ + bfd_get_start_address (abfd) = i_ehdrp->e_entry; + return abfd->xvec; + +wrong: + bfd_set_error (bfd_error_wrong_format); +fail: + return NULL; +} |