| /* 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; |
| } |