diff options
Diffstat (limited to 'bfd/elfcore.h')
| -rw-r--r-- | bfd/elfcore.h | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/bfd/elfcore.h b/bfd/elfcore.h new file mode 100644 index 00000000000..e4454aac9d0 --- /dev/null +++ b/bfd/elfcore.h @@ -0,0 +1,226 @@ +/* ELF core file support for BFD. + Copyright (C) 1995, 1996, 1997, 1998 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 +(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. */ + + +char* +elf_core_file_failing_command (abfd) + bfd *abfd; +{ + return elf_tdata (abfd)->core_command; +} + +int +elf_core_file_failing_signal (abfd) + bfd *abfd; +{ + return elf_tdata (abfd)->core_signal; +} + + +boolean +elf_core_file_matches_executable_p (core_bfd, exec_bfd) + 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 (abfd) + 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; + struct elf_backend_data *ebd; + + /* Read in the ELF header in external format. */ + if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr)) + { + if (bfd_get_error () != bfd_error_system_call) + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + + /* Check the magic number. */ + if (elf_file_p (&x_ehdr) == false) + { + wrong: + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + + /* 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. */ + elf_tdata (abfd) = + (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)); + if (elf_tdata (abfd) == NULL) + return NULL; + + /* FIXME: from here on down, "goto wrong" will leak memory. */ + + /* 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++) + { + 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) + { + /* 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; + + /* Allocate space for the program headers. */ + i_phdrp = (Elf_Internal_Phdr *) + bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum); + if (!i_phdrp) + return NULL; + + 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_read ((PTR) &x_phdr, sizeof (x_phdr), 1, abfd) + != sizeof (x_phdr)) + return NULL; + + elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); + } + + /* Process each program header. */ + for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) + { + if (!_bfd_elfcore_section_from_phdr (abfd, i_phdrp + phindex, phindex)) + return NULL; + } + + /* Set the machine architecture. */ + 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) + return NULL; + } + + /* Save the entry point from the ELF header. */ + bfd_get_start_address (abfd) = i_ehdrp->e_entry; + + return abfd->xvec; +} |