1 /* ELF core file support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005, 2007,
3 2008, 2010 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
23 elf_core_file_failing_command (bfd
*abfd
)
25 return elf_tdata (abfd
)->core_command
;
29 elf_core_file_failing_signal (bfd
*abfd
)
31 return elf_tdata (abfd
)->core_signal
;
35 elf_core_file_pid (bfd
*abfd
)
37 return elf_tdata (abfd
)->core_pid
;
41 elf_core_file_matches_executable_p (bfd
*core_bfd
, bfd
*exec_bfd
)
45 /* xvecs must match if both are ELF files for the same target. */
47 if (core_bfd
->xvec
!= exec_bfd
->xvec
)
49 bfd_set_error (bfd_error_system_call
);
53 /* See if the name in the corefile matches the executable name. */
54 corename
= elf_tdata (core_bfd
)->core_program
;
57 const char* execname
= strrchr (exec_bfd
->filename
, '/');
59 execname
= execname
? execname
+ 1 : exec_bfd
->filename
;
61 if (strcmp (execname
, corename
) != 0)
68 /* Core files are simply standard ELF formatted files that partition
69 the file using the execution view of the file (program header table)
70 rather than the linking view. In fact, there is no section header
73 The process status information (including the contents of the general
74 register set) and the floating point register set are stored in a
75 segment of type PT_NOTE. We handcraft a couple of extra bfd sections
76 that allow standard bfd access to the general registers (.reg) and the
77 floating point registers (.reg2). */
80 elf_core_file_p (bfd
*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 const struct elf_backend_data
*ebd
;
87 struct bfd_preserve preserve
;
90 preserve
.marker
= NULL
;
92 /* Read in the ELF header in external format. */
93 if (bfd_bread (&x_ehdr
, sizeof (x_ehdr
), abfd
) != sizeof (x_ehdr
))
95 if (bfd_get_error () != bfd_error_system_call
)
101 /* Check the magic number. */
102 if (! elf_file_p (&x_ehdr
))
105 /* FIXME: Check EI_VERSION here ! */
107 /* Check the address size ("class"). */
108 if (x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
111 /* Check the byteorder. */
112 switch (x_ehdr
.e_ident
[EI_DATA
])
114 case ELFDATA2MSB
: /* Big-endian. */
115 if (! bfd_big_endian (abfd
))
118 case ELFDATA2LSB
: /* Little-endian. */
119 if (! bfd_little_endian (abfd
))
126 if (!bfd_preserve_save (abfd
, &preserve
))
129 /* Give abfd an elf_obj_tdata. */
130 if (! (*abfd
->xvec
->_bfd_set_format
[bfd_core
]) (abfd
))
132 preserve
.marker
= elf_tdata (abfd
);
134 /* Swap in the rest of the header, now that we have the byte order. */
135 i_ehdrp
= elf_elfheader (abfd
);
136 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
139 elf_debug_file (i_ehdrp
);
142 ebd
= get_elf_backend_data (abfd
);
144 /* Check that the ELF e_machine field matches what this particular
145 BFD format expects. */
147 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
148 && (ebd
->elf_machine_alt1
== 0
149 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
150 && (ebd
->elf_machine_alt2
== 0
151 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
))
153 const bfd_target
* const *target_ptr
;
155 if (ebd
->elf_machine_code
!= EM_NONE
)
158 /* This is the generic ELF target. Let it match any ELF target
159 for which we do not have a specific backend. */
161 for (target_ptr
= bfd_target_vector
; *target_ptr
!= NULL
; target_ptr
++)
163 const struct elf_backend_data
*back
;
165 if ((*target_ptr
)->flavour
!= bfd_target_elf_flavour
)
167 back
= xvec_get_elf_backend_data (*target_ptr
);
168 if (back
->s
->arch_size
!= ARCH_SIZE
)
170 if (back
->elf_machine_code
== i_ehdrp
->e_machine
171 || (back
->elf_machine_alt1
!= 0
172 && i_ehdrp
->e_machine
== back
->elf_machine_alt1
)
173 || (back
->elf_machine_alt2
!= 0
174 && i_ehdrp
->e_machine
== back
->elf_machine_alt2
))
176 /* target_ptr is an ELF backend which matches this
177 object file, so reject the generic ELF target. */
183 /* If there is no program header, or the type is not a core file, then
185 if (i_ehdrp
->e_phoff
== 0 || i_ehdrp
->e_type
!= ET_CORE
)
188 /* Does BFD's idea of the phdr size match the size
189 recorded in the file? */
190 if (i_ehdrp
->e_phentsize
!= sizeof (Elf_External_Phdr
))
193 /* If the program header count is PN_XNUM(0xffff), the actual
194 count is in the first section header. */
195 if (i_ehdrp
->e_shoff
!= 0 && i_ehdrp
->e_phnum
== PN_XNUM
)
197 Elf_External_Shdr x_shdr
;
198 Elf_Internal_Shdr i_shdr
;
199 bfd_signed_vma where
= i_ehdrp
->e_shoff
;
201 if (where
!= (file_ptr
) where
)
204 /* Seek to the section header table in the file. */
205 if (bfd_seek (abfd
, (file_ptr
) where
, SEEK_SET
) != 0)
208 /* Read the first section header at index 0, and convert to internal
210 if (bfd_bread (&x_shdr
, sizeof (x_shdr
), abfd
) != sizeof (x_shdr
))
212 elf_swap_shdr_in (abfd
, &x_shdr
, &i_shdr
);
214 if (i_shdr
.sh_info
!= 0)
216 i_ehdrp
->e_phnum
= i_shdr
.sh_info
;
217 if (i_ehdrp
->e_phnum
!= i_shdr
.sh_info
)
222 /* Sanity check that we can read all of the program headers.
223 It ought to be good enough to just read the last one. */
224 if (i_ehdrp
->e_phnum
> 1)
226 Elf_External_Phdr x_phdr
;
227 Elf_Internal_Phdr i_phdr
;
228 bfd_signed_vma where
;
230 /* Check that we don't have a totally silly number of
232 if (i_ehdrp
->e_phnum
> (unsigned int) -1 / sizeof (x_phdr
)
233 || i_ehdrp
->e_phnum
> (unsigned int) -1 / sizeof (i_phdr
))
236 where
= i_ehdrp
->e_phoff
+ (i_ehdrp
->e_phnum
- 1) * sizeof (x_phdr
);
237 if (where
!= (file_ptr
) where
)
239 if ((bfd_size_type
) where
<= i_ehdrp
->e_phoff
)
242 if (bfd_seek (abfd
, (file_ptr
) where
, SEEK_SET
) != 0)
244 if (bfd_bread (&x_phdr
, sizeof (x_phdr
), abfd
) != sizeof (x_phdr
))
248 /* Move to the start of the program headers. */
249 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
252 /* Allocate space for the program headers. */
253 amt
= sizeof (*i_phdrp
) * i_ehdrp
->e_phnum
;
254 i_phdrp
= (Elf_Internal_Phdr
*) bfd_alloc (abfd
, amt
);
258 elf_tdata (abfd
)->phdr
= i_phdrp
;
260 /* Read and convert to internal form. */
261 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
263 Elf_External_Phdr x_phdr
;
265 if (bfd_bread (&x_phdr
, sizeof (x_phdr
), abfd
) != sizeof (x_phdr
))
268 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdrp
+ phindex
);
271 /* Set the machine architecture. Do this before processing the
272 program headers since we need to know the architecture type
273 when processing the notes of some systems' core files. */
274 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0)
275 /* It's OK if this fails for the generic target. */
276 && ebd
->elf_machine_code
!= EM_NONE
)
279 /* Let the backend double check the format and override global
280 information. We do this before processing the program headers
281 to allow the correct machine (as opposed to just the default
282 machine) to be set, making it possible for grok_prstatus and
283 grok_psinfo to rely on the mach setting. */
284 if (ebd
->elf_backend_object_p
!= NULL
285 && ! ebd
->elf_backend_object_p (abfd
))
288 /* Process each program header. */
289 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
290 if (! bfd_section_from_phdr (abfd
, i_phdrp
+ phindex
, (int) phindex
))
293 /* Check for core truncation. */
295 bfd_size_type high
= 0;
297 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
299 Elf_Internal_Phdr
*p
= i_phdrp
+ phindex
;
302 bfd_size_type current
= p
->p_offset
+ p
->p_filesz
;
307 if (bfd_stat (abfd
, &statbuf
) == 0)
309 if ((bfd_size_type
) statbuf
.st_size
< high
)
311 (*_bfd_error_handler
)
312 (_("Warning: %B is truncated: expected core file "
313 "size >= %lu, found: %lu."),
314 abfd
, (unsigned long) high
, (unsigned long) statbuf
.st_size
);
319 /* Save the entry point from the ELF header. */
320 bfd_get_start_address (abfd
) = i_ehdrp
->e_entry
;
322 bfd_preserve_finish (abfd
, &preserve
);
326 /* There is way too much undoing of half-known state here. The caller,
327 bfd_check_format_matches, really shouldn't iterate on live bfd's to
328 check match/no-match like it does. We have to rely on that a call to
329 bfd_default_set_arch_mach with the previously known mach, undoes what
330 was done by the first bfd_default_set_arch_mach (with mach 0) here.
331 For this to work, only elf-data and the mach may be changed by the
332 target-specific elf_backend_object_p function. Note that saving the
333 whole bfd here and restoring it would be even worse; the first thing
334 you notice is that the cached bfd file position gets out of sync. */
335 bfd_set_error (bfd_error_wrong_format
);
338 if (preserve
.marker
!= NULL
)
339 bfd_preserve_restore (abfd
, &preserve
);
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