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_matches_executable_p (bfd
*core_bfd
, bfd
*exec_bfd
)
39 /* xvecs must match if both are ELF files for the same target. */
41 if (core_bfd
->xvec
!= exec_bfd
->xvec
)
43 bfd_set_error (bfd_error_system_call
);
47 /* See if the name in the corefile matches the executable name. */
48 corename
= elf_tdata (core_bfd
)->core_program
;
51 const char* execname
= strrchr (exec_bfd
->filename
, '/');
53 execname
= execname
? execname
+ 1 : exec_bfd
->filename
;
55 if (strcmp (execname
, corename
) != 0)
62 /* Core files are simply standard ELF formatted files that partition
63 the file using the execution view of the file (program header table)
64 rather than the linking view. In fact, there is no section header
67 The process status information (including the contents of the general
68 register set) and the floating point register set are stored in a
69 segment of type PT_NOTE. We handcraft a couple of extra bfd sections
70 that allow standard bfd access to the general registers (.reg) and the
71 floating point registers (.reg2). */
74 elf_core_file_p (bfd
*abfd
)
76 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form. */
77 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form. */
78 Elf_Internal_Phdr
*i_phdrp
; /* Elf program header, internal form. */
80 const struct elf_backend_data
*ebd
;
81 struct bfd_preserve preserve
;
84 preserve
.marker
= NULL
;
86 /* Read in the ELF header in external format. */
87 if (bfd_bread (&x_ehdr
, sizeof (x_ehdr
), abfd
) != sizeof (x_ehdr
))
89 if (bfd_get_error () != bfd_error_system_call
)
95 /* Check the magic number. */
96 if (! elf_file_p (&x_ehdr
))
99 /* FIXME: Check EI_VERSION here ! */
101 /* Check the address size ("class"). */
102 if (x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
105 /* Check the byteorder. */
106 switch (x_ehdr
.e_ident
[EI_DATA
])
108 case ELFDATA2MSB
: /* Big-endian. */
109 if (! bfd_big_endian (abfd
))
112 case ELFDATA2LSB
: /* Little-endian. */
113 if (! bfd_little_endian (abfd
))
120 if (!bfd_preserve_save (abfd
, &preserve
))
123 /* Give abfd an elf_obj_tdata. */
124 if (! (*abfd
->xvec
->_bfd_set_format
[bfd_core
]) (abfd
))
126 preserve
.marker
= elf_tdata (abfd
);
128 /* Swap in the rest of the header, now that we have the byte order. */
129 i_ehdrp
= elf_elfheader (abfd
);
130 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
133 elf_debug_file (i_ehdrp
);
136 ebd
= get_elf_backend_data (abfd
);
138 /* Check that the ELF e_machine field matches what this particular
139 BFD format expects. */
141 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
142 && (ebd
->elf_machine_alt1
== 0
143 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
144 && (ebd
->elf_machine_alt2
== 0
145 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
))
147 const bfd_target
* const *target_ptr
;
149 if (ebd
->elf_machine_code
!= EM_NONE
)
152 /* This is the generic ELF target. Let it match any ELF target
153 for which we do not have a specific backend. */
155 for (target_ptr
= bfd_target_vector
; *target_ptr
!= NULL
; target_ptr
++)
157 const struct elf_backend_data
*back
;
159 if ((*target_ptr
)->flavour
!= bfd_target_elf_flavour
)
161 back
= xvec_get_elf_backend_data (*target_ptr
);
162 if (back
->s
->arch_size
!= ARCH_SIZE
)
164 if (back
->elf_machine_code
== i_ehdrp
->e_machine
165 || (back
->elf_machine_alt1
!= 0
166 && i_ehdrp
->e_machine
== back
->elf_machine_alt1
)
167 || (back
->elf_machine_alt2
!= 0
168 && i_ehdrp
->e_machine
== back
->elf_machine_alt2
))
170 /* target_ptr is an ELF backend which matches this
171 object file, so reject the generic ELF target. */
177 /* If there is no program header, or the type is not a core file, then
179 if (i_ehdrp
->e_phoff
== 0 || i_ehdrp
->e_type
!= ET_CORE
)
182 /* Does BFD's idea of the phdr size match the size
183 recorded in the file? */
184 if (i_ehdrp
->e_phentsize
!= sizeof (Elf_External_Phdr
))
187 /* If the program header count is PN_XNUM(0xffff), the actual
188 count is in the first section header. */
189 if (i_ehdrp
->e_shoff
!= 0 && i_ehdrp
->e_phnum
== PN_XNUM
)
191 Elf_External_Shdr x_shdr
;
192 Elf_Internal_Shdr i_shdr
;
193 bfd_signed_vma where
= i_ehdrp
->e_shoff
;
195 if (where
!= (file_ptr
) where
)
198 /* Seek to the section header table in the file. */
199 if (bfd_seek (abfd
, (file_ptr
) where
, SEEK_SET
) != 0)
202 /* Read the first section header at index 0, and convert to internal
204 if (bfd_bread (&x_shdr
, sizeof (x_shdr
), abfd
) != sizeof (x_shdr
))
206 elf_swap_shdr_in (abfd
, &x_shdr
, &i_shdr
);
208 if (i_shdr
.sh_info
!= 0)
210 i_ehdrp
->e_phnum
= i_shdr
.sh_info
;
211 if (i_ehdrp
->e_phnum
!= i_shdr
.sh_info
)
216 /* Sanity check that we can read all of the program headers.
217 It ought to be good enough to just read the last one. */
218 if (i_ehdrp
->e_phnum
> 1)
220 Elf_External_Phdr x_phdr
;
221 Elf_Internal_Phdr i_phdr
;
222 bfd_signed_vma where
;
224 /* Check that we don't have a totally silly number of
226 if (i_ehdrp
->e_phnum
> (unsigned int) -1 / sizeof (x_phdr
)
227 || i_ehdrp
->e_phnum
> (unsigned int) -1 / sizeof (i_phdr
))
230 where
= i_ehdrp
->e_phoff
+ (i_ehdrp
->e_phnum
- 1) * sizeof (x_phdr
);
231 if (where
!= (file_ptr
) where
)
233 if ((bfd_size_type
) where
<= i_ehdrp
->e_phoff
)
236 if (bfd_seek (abfd
, (file_ptr
) where
, SEEK_SET
) != 0)
238 if (bfd_bread (&x_phdr
, sizeof (x_phdr
), abfd
) != sizeof (x_phdr
))
242 /* Move to the start of the program headers. */
243 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
246 /* Allocate space for the program headers. */
247 amt
= sizeof (*i_phdrp
) * i_ehdrp
->e_phnum
;
248 i_phdrp
= (Elf_Internal_Phdr
*) bfd_alloc (abfd
, amt
);
252 elf_tdata (abfd
)->phdr
= i_phdrp
;
254 /* Read and convert to internal form. */
255 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
257 Elf_External_Phdr x_phdr
;
259 if (bfd_bread (&x_phdr
, sizeof (x_phdr
), abfd
) != sizeof (x_phdr
))
262 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdrp
+ phindex
);
265 /* Set the machine architecture. Do this before processing the
266 program headers since we need to know the architecture type
267 when processing the notes of some systems' core files. */
268 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0)
269 /* It's OK if this fails for the generic target. */
270 && ebd
->elf_machine_code
!= EM_NONE
)
273 /* Let the backend double check the format and override global
274 information. We do this before processing the program headers
275 to allow the correct machine (as opposed to just the default
276 machine) to be set, making it possible for grok_prstatus and
277 grok_psinfo to rely on the mach setting. */
278 if (ebd
->elf_backend_object_p
!= NULL
279 && ! ebd
->elf_backend_object_p (abfd
))
282 /* Process each program header. */
283 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
284 if (! bfd_section_from_phdr (abfd
, i_phdrp
+ phindex
, (int) phindex
))
287 /* Check for core truncation. */
289 bfd_size_type high
= 0;
291 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
293 Elf_Internal_Phdr
*p
= i_phdrp
+ phindex
;
296 bfd_size_type current
= p
->p_offset
+ p
->p_filesz
;
301 if (bfd_stat (abfd
, &statbuf
) == 0)
303 if ((bfd_size_type
) statbuf
.st_size
< high
)
305 (*_bfd_error_handler
)
306 (_("Warning: %B is truncated: expected core file "
307 "size >= %lu, found: %lu."),
308 abfd
, (unsigned long) high
, (unsigned long) statbuf
.st_size
);
313 /* Save the entry point from the ELF header. */
314 bfd_get_start_address (abfd
) = i_ehdrp
->e_entry
;
316 bfd_preserve_finish (abfd
, &preserve
);
320 /* There is way too much undoing of half-known state here. The caller,
321 bfd_check_format_matches, really shouldn't iterate on live bfd's to
322 check match/no-match like it does. We have to rely on that a call to
323 bfd_default_set_arch_mach with the previously known mach, undoes what
324 was done by the first bfd_default_set_arch_mach (with mach 0) here.
325 For this to work, only elf-data and the mach may be changed by the
326 target-specific elf_backend_object_p function. Note that saving the
327 whole bfd here and restoring it would be even worse; the first thing
328 you notice is that the cached bfd file position gets out of sync. */
329 bfd_set_error (bfd_error_wrong_format
);
332 if (preserve
.marker
!= NULL
)
333 bfd_preserve_restore (abfd
, &preserve
);
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