1 /* ELF core file support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003
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. */
51 corename
= elf_tdata (core_bfd
)->core_program
;
54 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). */
77 elf_core_file_p (abfd
)
80 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form. */
81 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form. */
82 Elf_Internal_Phdr
*i_phdrp
; /* Elf program header, internal form. */
84 struct elf_backend_data
*ebd
;
85 struct bfd_preserve preserve
;
88 preserve
.marker
= NULL
;
90 /* Read in the ELF header in external format. */
91 if (bfd_bread ((PTR
) &x_ehdr
, (bfd_size_type
) sizeof (x_ehdr
), abfd
)
94 if (bfd_get_error () != bfd_error_system_call
)
100 /* Check the magic number. */
101 if (! elf_file_p (&x_ehdr
))
104 /* FIXME: Check EI_VERSION here ! */
106 /* Check the address size ("class"). */
107 if (x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
110 /* Check the byteorder. */
111 switch (x_ehdr
.e_ident
[EI_DATA
])
113 case ELFDATA2MSB
: /* Big-endian. */
114 if (! bfd_big_endian (abfd
))
117 case ELFDATA2LSB
: /* Little-endian. */
118 if (! bfd_little_endian (abfd
))
125 /* Give abfd an elf_obj_tdata. */
126 amt
= sizeof (struct elf_obj_tdata
);
127 preserve
.marker
= bfd_zalloc (abfd
, amt
);
128 if (preserve
.marker
== NULL
)
130 if (!bfd_preserve_save (abfd
, &preserve
))
133 elf_tdata (abfd
) = preserve
.marker
;
135 /* Swap in the rest of the header, now that we have the byte order. */
136 i_ehdrp
= elf_elfheader (abfd
);
137 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
140 elf_debug_file (i_ehdrp
);
143 ebd
= get_elf_backend_data (abfd
);
145 /* Check that the ELF e_machine field matches what this particular
146 BFD format expects. */
148 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
149 && (ebd
->elf_machine_alt1
== 0
150 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
151 && (ebd
->elf_machine_alt2
== 0
152 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
))
154 const bfd_target
* const *target_ptr
;
156 if (ebd
->elf_machine_code
!= EM_NONE
)
159 /* This is the generic ELF target. Let it match any ELF target
160 for which we do not have a specific backend. */
162 for (target_ptr
= bfd_target_vector
; *target_ptr
!= NULL
; target_ptr
++)
164 struct elf_backend_data
*back
;
166 if ((*target_ptr
)->flavour
!= bfd_target_elf_flavour
)
168 back
= (struct elf_backend_data
*) (*target_ptr
)->backend_data
;
169 if (back
->elf_machine_code
== i_ehdrp
->e_machine
170 || (back
->elf_machine_alt1
!= 0
171 && i_ehdrp
->e_machine
== back
->elf_machine_alt1
)
172 || (back
->elf_machine_alt2
!= 0
173 && i_ehdrp
->e_machine
== back
->elf_machine_alt2
))
175 /* target_ptr is an ELF backend which matches this
176 object file, so reject the generic ELF target. */
182 /* If there is no program header, or the type is not a core file, then
184 if (i_ehdrp
->e_phoff
== 0 || i_ehdrp
->e_type
!= ET_CORE
)
187 /* Does BFD's idea of the phdr size match the size
188 recorded in the file? */
189 if (i_ehdrp
->e_phentsize
!= sizeof (Elf_External_Phdr
))
192 /* Move to the start of the program headers. */
193 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
196 /* Allocate space for the program headers. */
197 amt
= sizeof (*i_phdrp
) * i_ehdrp
->e_phnum
;
198 i_phdrp
= (Elf_Internal_Phdr
*) bfd_alloc (abfd
, amt
);
202 elf_tdata (abfd
)->phdr
= i_phdrp
;
204 /* Read and convert to internal form. */
205 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
207 Elf_External_Phdr x_phdr
;
209 if (bfd_bread ((PTR
) &x_phdr
, (bfd_size_type
) sizeof (x_phdr
), abfd
)
213 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdrp
+ phindex
);
216 /* Set the machine architecture. Do this before processing the
217 program headers since we need to know the architecture type
218 when processing the notes of some systems' core files. */
219 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0))
221 /* It's OK if this fails for the generic target. */
222 if (ebd
->elf_machine_code
!= EM_NONE
)
226 /* Process each program header. */
227 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
228 if (! bfd_section_from_phdr (abfd
, i_phdrp
+ phindex
, (int) phindex
))
231 /* Save the entry point from the ELF header. */
232 bfd_get_start_address (abfd
) = i_ehdrp
->e_entry
;
234 /* Let the backend double check the format and override global
236 if (ebd
->elf_backend_object_p
237 && (! (*ebd
->elf_backend_object_p
) (abfd
)))
240 bfd_preserve_finish (abfd
, &preserve
);
244 /* There is way too much undoing of half-known state here. The caller,
245 bfd_check_format_matches, really shouldn't iterate on live bfd's to
246 check match/no-match like it does. We have to rely on that a call to
247 bfd_default_set_arch_mach with the previously known mach, undoes what
248 was done by the first bfd_default_set_arch_mach (with mach 0) here.
249 For this to work, only elf-data and the mach may be changed by the
250 target-specific elf_backend_object_p function. Note that saving the
251 whole bfd here and restoring it would be even worse; the first thing
252 you notice is that the cached bfd file position gets out of sync. */
253 bfd_set_error (bfd_error_wrong_format
);
256 if (preserve
.marker
!= NULL
)
257 bfd_preserve_restore (abfd
, &preserve
);
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