elfcore.h revision 78828
1/* ELF core file support for BFD. 2 Copyright 1995, 1996, 1997, 1998, 2000, 2001 3 Free Software Foundation, Inc. 4 5This file is part of BFD, the Binary File Descriptor library. 6 7This program is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2 of the License, or 10(at your option) any later version. 11 12This program is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with this program; if not, write to the Free Software 19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21char* 22elf_core_file_failing_command (abfd) 23 bfd *abfd; 24{ 25 return elf_tdata (abfd)->core_command; 26} 27 28int 29elf_core_file_failing_signal (abfd) 30 bfd *abfd; 31{ 32 return elf_tdata (abfd)->core_signal; 33} 34 35boolean 36elf_core_file_matches_executable_p (core_bfd, exec_bfd) 37 bfd *core_bfd; 38 bfd *exec_bfd; 39{ 40 char* corename; 41 42 /* xvecs must match if both are ELF files for the same target. */ 43 44 if (core_bfd->xvec != exec_bfd->xvec) 45 { 46 bfd_set_error (bfd_error_system_call); 47 return false; 48 } 49 50 /* See if the name in the corefile matches the executable name. */ 51 52 corename = elf_tdata (core_bfd)->core_program; 53 if (corename != NULL) 54 { 55 const char* execname = strrchr (exec_bfd->filename, '/'); 56 execname = execname ? execname + 1 : exec_bfd->filename; 57 58 if (strcmp(execname, corename) != 0) 59 return false; 60 } 61 62 return true; 63} 64 65/* Core files are simply standard ELF formatted files that partition 66 the file using the execution view of the file (program header table) 67 rather than the linking view. In fact, there is no section header 68 table in a core file. 69 70 The process status information (including the contents of the general 71 register set) and the floating point register set are stored in a 72 segment of type PT_NOTE. We handcraft a couple of extra bfd sections 73 that allow standard bfd access to the general registers (.reg) and the 74 floating point registers (.reg2). 75 76 */ 77 78const bfd_target * 79elf_core_file_p (abfd) 80 bfd *abfd; 81{ 82 Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ 83 Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ 84 Elf_Internal_Phdr *i_phdrp = NULL; /* Elf program header, internal form */ 85 unsigned int phindex; 86 struct elf_backend_data *ebd; 87 struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd); 88 struct elf_obj_tdata *new_tdata = NULL; 89 90 /* Read in the ELF header in external format. */ 91 if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr)) 92 { 93 if (bfd_get_error () != bfd_error_system_call) 94 bfd_set_error (bfd_error_wrong_format); 95 return NULL; 96 } 97 98 /* Check the magic number. */ 99 if (elf_file_p (&x_ehdr) == false) 100 goto wrong; 101 102 /* FIXME: Check EI_VERSION here ! */ 103 104 /* Check the address size ("class"). */ 105 if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) 106 goto wrong; 107 108 /* Check the byteorder. */ 109 switch (x_ehdr.e_ident[EI_DATA]) 110 { 111 case ELFDATA2MSB: /* Big-endian */ 112 if (! bfd_big_endian (abfd)) 113 goto wrong; 114 break; 115 case ELFDATA2LSB: /* Little-endian */ 116 if (! bfd_little_endian (abfd)) 117 goto wrong; 118 break; 119 default: 120 goto wrong; 121 } 122 123 /* Give abfd an elf_obj_tdata. */ 124 new_tdata = 125 (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)); 126 if (new_tdata == NULL) 127 return NULL; 128 elf_tdata (abfd) = new_tdata; 129 130 /* Swap in the rest of the header, now that we have the byte order. */ 131 i_ehdrp = elf_elfheader (abfd); 132 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); 133 134#if DEBUG & 1 135 elf_debug_file (i_ehdrp); 136#endif 137 138 ebd = get_elf_backend_data (abfd); 139 140 /* Check that the ELF e_machine field matches what this particular 141 BFD format expects. */ 142 143 if (ebd->elf_machine_code != i_ehdrp->e_machine 144 && (ebd->elf_machine_alt1 == 0 145 || i_ehdrp->e_machine != ebd->elf_machine_alt1) 146 && (ebd->elf_machine_alt2 == 0 147 || i_ehdrp->e_machine != ebd->elf_machine_alt2)) 148 { 149 const bfd_target * const *target_ptr; 150 151 if (ebd->elf_machine_code != EM_NONE) 152 goto wrong; 153 154 /* This is the generic ELF target. Let it match any ELF target 155 for which we do not have a specific backend. */ 156 157 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) 158 { 159 struct elf_backend_data *back; 160 161 if ((*target_ptr)->flavour != bfd_target_elf_flavour) 162 continue; 163 back = (struct elf_backend_data *) (*target_ptr)->backend_data; 164 if (back->elf_machine_code == i_ehdrp->e_machine) 165 { 166 /* target_ptr is an ELF backend which matches this 167 object file, so reject the generic ELF target. */ 168 goto wrong; 169 } 170 } 171 } 172 173 /* If there is no program header, or the type is not a core file, then 174 we are hosed. */ 175 if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) 176 goto wrong; 177 178 /* Does BFD's idea of the phdr size match the size 179 recorded in the file? */ 180 if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr)) 181 goto wrong; 182 183 /* Move to the start of the program headers. */ 184 if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) != 0) 185 goto wrong; 186 187 /* Allocate space for the program headers. */ 188 i_phdrp = (Elf_Internal_Phdr *) 189 bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum); 190 if (!i_phdrp) 191 goto fail; 192 193 elf_tdata (abfd)->phdr = i_phdrp; 194 195 /* Read and convert to internal form. */ 196 for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) 197 { 198 Elf_External_Phdr x_phdr; 199 if (bfd_read ((PTR) &x_phdr, sizeof (x_phdr), 1, abfd) 200 != sizeof (x_phdr)) 201 goto fail; 202 203 elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); 204 } 205 206 /* Process each program header. */ 207 for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) 208 { 209 if (!_bfd_elfcore_section_from_phdr (abfd, i_phdrp + phindex, phindex)) 210 goto fail; 211 } 212 213 /* Set the machine architecture. */ 214 if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) 215 { 216 /* It's OK if this fails for the generic target. */ 217 if (ebd->elf_machine_code != EM_NONE) 218 goto fail; 219 } 220 221 /* Save the entry point from the ELF header. */ 222 bfd_get_start_address (abfd) = i_ehdrp->e_entry; 223 224 /* Let the backend double check the format and override global 225 information. */ 226 if (ebd->elf_backend_object_p) 227 { 228 if ((*ebd->elf_backend_object_p) (abfd) == false) 229 goto wrong; 230 } 231 232 return abfd->xvec; 233 234wrong: 235 bfd_set_error (bfd_error_wrong_format); 236fail: 237 if (i_phdrp != NULL) 238 bfd_release (abfd, i_phdrp); 239 if (new_tdata != NULL) 240 bfd_release (abfd, new_tdata); 241 elf_tdata (abfd) = preserved_tdata; 242 return NULL; 243} 244