1 /* ELF core file support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 elf_core_file_failing_command (abfd)
25 return elf_tdata (abfd)->core_command;
29 elf_core_file_failing_signal (abfd)
32 return elf_tdata (abfd)->core_signal;
36 elf_core_file_matches_executable_p (core_bfd, exec_bfd)
42 /* xvecs must match if both are ELF files for the same target. */
44 if (core_bfd->xvec != exec_bfd->xvec)
46 bfd_set_error (bfd_error_system_call);
50 /* See if the name in the corefile matches the executable name. */
52 corename = elf_tdata (core_bfd)->core_program;
55 const char* execname = strrchr (exec_bfd->filename, '/');
56 execname = execname ? execname + 1 : exec_bfd->filename;
58 if (strcmp(execname, corename) != 0)
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
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).
79 elf_core_file_p (abfd)
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; /* Elf program header, internal form */
86 struct elf_backend_data *ebd;
87 struct bfd_preserve preserve;
88 struct elf_obj_tdata *new_tdata = NULL;
91 preserve.arch_info = abfd->arch_info;
93 /* Read in the ELF header in external format. */
94 if (bfd_bread ((PTR) &x_ehdr, (bfd_size_type) sizeof (x_ehdr), abfd)
97 if (bfd_get_error () != bfd_error_system_call)
98 bfd_set_error (bfd_error_wrong_format);
102 /* Check the magic number. */
103 if (elf_file_p (&x_ehdr) == false)
106 /* FIXME: Check EI_VERSION here ! */
108 /* Check the address size ("class"). */
109 if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
112 /* Check the byteorder. */
113 switch (x_ehdr.e_ident[EI_DATA])
115 case ELFDATA2MSB: /* Big-endian */
116 if (! bfd_big_endian (abfd))
119 case ELFDATA2LSB: /* Little-endian */
120 if (! bfd_little_endian (abfd))
127 /* Give abfd an elf_obj_tdata. */
128 amt = sizeof (struct elf_obj_tdata);
129 new_tdata = (struct elf_obj_tdata *) bfd_zalloc (abfd, amt);
130 if (new_tdata == NULL)
132 preserve.tdata = elf_tdata (abfd);
133 elf_tdata (abfd) = new_tdata;
135 /* Clear section information, since there might be a recognized bfd that
136 we now check if we can replace, and we don't want to append to it. */
137 preserve.sections = abfd->sections;
138 preserve.section_tail = abfd->section_tail;
139 preserve.section_count = abfd->section_count;
140 preserve.section_htab = abfd->section_htab;
141 abfd->sections = NULL;
142 abfd->section_tail = &abfd->sections;
143 abfd->section_count = 0;
144 if (!bfd_hash_table_init (&abfd->section_htab, bfd_section_hash_newfunc))
147 /* Swap in the rest of the header, now that we have the byte order. */
148 i_ehdrp = elf_elfheader (abfd);
149 elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
152 elf_debug_file (i_ehdrp);
155 ebd = get_elf_backend_data (abfd);
157 /* Check that the ELF e_machine field matches what this particular
158 BFD format expects. */
160 if (ebd->elf_machine_code != i_ehdrp->e_machine
161 && (ebd->elf_machine_alt1 == 0
162 || i_ehdrp->e_machine != ebd->elf_machine_alt1)
163 && (ebd->elf_machine_alt2 == 0
164 || i_ehdrp->e_machine != ebd->elf_machine_alt2))
166 const bfd_target * const *target_ptr;
168 if (ebd->elf_machine_code != EM_NONE)
171 /* This is the generic ELF target. Let it match any ELF target
172 for which we do not have a specific backend. */
174 for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
176 struct elf_backend_data *back;
178 if ((*target_ptr)->flavour != bfd_target_elf_flavour)
180 back = (struct elf_backend_data *) (*target_ptr)->backend_data;
181 if (back->elf_machine_code == i_ehdrp->e_machine)
183 /* target_ptr is an ELF backend which matches this
184 object file, so reject the generic ELF target. */
190 /* If there is no program header, or the type is not a core file, then
192 if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE)
195 /* Does BFD's idea of the phdr size match the size
196 recorded in the file? */
197 if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr))
200 /* Move to the start of the program headers. */
201 if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0)
204 /* Allocate space for the program headers. */
205 amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum;
206 i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
210 elf_tdata (abfd)->phdr = i_phdrp;
212 /* Read and convert to internal form. */
213 for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
215 Elf_External_Phdr x_phdr;
216 if (bfd_bread ((PTR) &x_phdr, (bfd_size_type) sizeof (x_phdr), abfd)
220 elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);
223 /* Set the machine architecture. */
224 if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
226 /* It's OK if this fails for the generic target. */
227 if (ebd->elf_machine_code != EM_NONE)
231 /* Process each program header. */
232 for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
234 if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex))
238 /* Save the entry point from the ELF header. */
239 bfd_get_start_address (abfd) = i_ehdrp->e_entry;
241 /* Let the backend double check the format and override global
243 if (ebd->elf_backend_object_p)
245 if ((*ebd->elf_backend_object_p) (abfd) == false)
249 bfd_hash_table_free (&preserve.section_htab);
253 /* There is way too much undoing of half-known state here. The caller,
254 bfd_check_format_matches, really shouldn't iterate on live bfd's to
255 check match/no-match like it does. We have to rely on that a call to
256 bfd_default_set_arch_mach with the previously known mach, undoes what
257 was done by the first bfd_default_set_arch_mach (with mach 0) here.
258 For this to work, only elf-data and the mach may be changed by the
259 target-specific elf_backend_object_p function. Note that saving the
260 whole bfd here and restoring it would be even worse; the first thing
261 you notice is that the cached bfd file position gets out of sync. */
262 bfd_set_error (bfd_error_wrong_format);
265 abfd->arch_info = preserve.arch_info;
266 if (new_tdata != NULL)
268 /* bfd_release frees all memory more recently bfd_alloc'd than
269 its arg, as well as its arg. */
270 bfd_release (abfd, new_tdata);
271 elf_tdata (abfd) = preserve.tdata;
272 abfd->section_htab = preserve.section_htab;
273 abfd->sections = preserve.sections;
274 abfd->section_tail = preserve.section_tail;
275 abfd->section_count = preserve.section_count;