1 /* ELF core file support for BFD.
2 Copyright (C) 1995-2014 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
22 elf_core_file_failing_command (bfd
*abfd
)
24 return elf_tdata (abfd
)->core
->command
;
28 elf_core_file_failing_signal (bfd
*abfd
)
30 return elf_tdata (abfd
)->core
->signal
;
34 elf_core_file_pid (bfd
*abfd
)
36 return elf_tdata (abfd
)->core
->pid
;
40 elf_core_file_matches_executable_p (bfd
*core_bfd
, bfd
*exec_bfd
)
44 /* xvecs must match if both are ELF files for the same target. */
46 if (core_bfd
->xvec
!= exec_bfd
->xvec
)
48 bfd_set_error (bfd_error_system_call
);
52 /* See if the name in the corefile matches the executable name. */
53 corename
= elf_tdata (core_bfd
)->core
->program
;
56 const char* execname
= strrchr (exec_bfd
->filename
, '/');
58 execname
= execname
? execname
+ 1 : exec_bfd
->filename
;
60 if (strcmp (execname
, corename
) != 0)
67 /* Core files are simply standard ELF formatted files that partition
68 the file using the execution view of the file (program header table)
69 rather than the linking view. In fact, there is no section header
72 The process status information (including the contents of the general
73 register set) and the floating point register set are stored in a
74 segment of type PT_NOTE. We handcraft a couple of extra bfd sections
75 that allow standard bfd access to the general registers (.reg) and the
76 floating point registers (.reg2). */
79 elf_core_file_p (bfd
*abfd
)
81 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form. */
82 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form. */
83 Elf_Internal_Phdr
*i_phdrp
; /* Elf program header, internal form. */
85 const struct elf_backend_data
*ebd
;
88 /* Read in the ELF header in external format. */
89 if (bfd_bread (&x_ehdr
, sizeof (x_ehdr
), abfd
) != sizeof (x_ehdr
))
91 if (bfd_get_error () != bfd_error_system_call
)
97 /* Check the magic number. */
98 if (! elf_file_p (&x_ehdr
))
101 /* FIXME: Check EI_VERSION here ! */
103 /* Check the address size ("class"). */
104 if (x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
107 /* Check the byteorder. */
108 switch (x_ehdr
.e_ident
[EI_DATA
])
110 case ELFDATA2MSB
: /* Big-endian. */
111 if (! bfd_big_endian (abfd
))
114 case ELFDATA2LSB
: /* Little-endian. */
115 if (! bfd_little_endian (abfd
))
122 /* Give abfd an elf_obj_tdata. */
123 if (! (*abfd
->xvec
->_bfd_set_format
[bfd_core
]) (abfd
))
126 /* Swap in the rest of the header, now that we have the byte order. */
127 i_ehdrp
= elf_elfheader (abfd
);
128 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
131 elf_debug_file (i_ehdrp
);
134 ebd
= get_elf_backend_data (abfd
);
136 /* Check that the ELF e_machine field matches what this particular
137 BFD format expects. */
139 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
140 && (ebd
->elf_machine_alt1
== 0
141 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
142 && (ebd
->elf_machine_alt2
== 0
143 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
))
145 const bfd_target
* const *target_ptr
;
147 if (ebd
->elf_machine_code
!= EM_NONE
)
150 /* This is the generic ELF target. Let it match any ELF target
151 for which we do not have a specific backend. */
153 for (target_ptr
= bfd_target_vector
; *target_ptr
!= NULL
; target_ptr
++)
155 const struct elf_backend_data
*back
;
157 if ((*target_ptr
)->flavour
!= bfd_target_elf_flavour
)
159 back
= xvec_get_elf_backend_data (*target_ptr
);
160 if (back
->s
->arch_size
!= ARCH_SIZE
)
162 if (back
->elf_machine_code
== i_ehdrp
->e_machine
163 || (back
->elf_machine_alt1
!= 0
164 && i_ehdrp
->e_machine
== back
->elf_machine_alt1
)
165 || (back
->elf_machine_alt2
!= 0
166 && i_ehdrp
->e_machine
== back
->elf_machine_alt2
))
168 /* target_ptr is an ELF backend which matches this
169 object file, so reject the generic ELF target. */
175 /* If there is no program header, or the type is not a core file, then
177 if (i_ehdrp
->e_phoff
== 0 || i_ehdrp
->e_type
!= ET_CORE
)
180 /* Does BFD's idea of the phdr size match the size
181 recorded in the file? */
182 if (i_ehdrp
->e_phentsize
!= sizeof (Elf_External_Phdr
))
185 /* If the program header count is PN_XNUM(0xffff), the actual
186 count is in the first section header. */
187 if (i_ehdrp
->e_shoff
!= 0 && i_ehdrp
->e_phnum
== PN_XNUM
)
189 Elf_External_Shdr x_shdr
;
190 Elf_Internal_Shdr i_shdr
;
191 bfd_signed_vma where
= i_ehdrp
->e_shoff
;
193 if (where
!= (file_ptr
) where
)
196 /* Seek to the section header table in the file. */
197 if (bfd_seek (abfd
, (file_ptr
) where
, SEEK_SET
) != 0)
200 /* Read the first section header at index 0, and convert to internal
202 if (bfd_bread (&x_shdr
, sizeof (x_shdr
), abfd
) != sizeof (x_shdr
))
204 elf_swap_shdr_in (abfd
, &x_shdr
, &i_shdr
);
206 if (i_shdr
.sh_info
!= 0)
208 i_ehdrp
->e_phnum
= i_shdr
.sh_info
;
209 if (i_ehdrp
->e_phnum
!= i_shdr
.sh_info
)
214 /* Sanity check that we can read all of the program headers.
215 It ought to be good enough to just read the last one. */
216 if (i_ehdrp
->e_phnum
> 1)
218 Elf_External_Phdr x_phdr
;
219 Elf_Internal_Phdr i_phdr
;
220 bfd_signed_vma where
;
222 /* Check that we don't have a totally silly number of
224 if (i_ehdrp
->e_phnum
> (unsigned int) -1 / sizeof (x_phdr
)
225 || i_ehdrp
->e_phnum
> (unsigned int) -1 / sizeof (i_phdr
))
228 where
= i_ehdrp
->e_phoff
+ (i_ehdrp
->e_phnum
- 1) * sizeof (x_phdr
);
229 if (where
!= (file_ptr
) where
)
231 if ((bfd_size_type
) where
<= i_ehdrp
->e_phoff
)
234 if (bfd_seek (abfd
, (file_ptr
) where
, SEEK_SET
) != 0)
236 if (bfd_bread (&x_phdr
, sizeof (x_phdr
), abfd
) != sizeof (x_phdr
))
240 /* Move to the start of the program headers. */
241 if (bfd_seek (abfd
, (file_ptr
) i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
244 /* Allocate space for the program headers. */
245 amt
= sizeof (*i_phdrp
) * i_ehdrp
->e_phnum
;
246 i_phdrp
= (Elf_Internal_Phdr
*) bfd_alloc (abfd
, amt
);
250 elf_tdata (abfd
)->phdr
= i_phdrp
;
252 /* Read and convert to internal form. */
253 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
255 Elf_External_Phdr x_phdr
;
257 if (bfd_bread (&x_phdr
, sizeof (x_phdr
), abfd
) != sizeof (x_phdr
))
260 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdrp
+ phindex
);
263 /* Set the machine architecture. Do this before processing the
264 program headers since we need to know the architecture type
265 when processing the notes of some systems' core files. */
266 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0)
267 /* It's OK if this fails for the generic target. */
268 && ebd
->elf_machine_code
!= EM_NONE
)
271 /* Let the backend double check the format and override global
272 information. We do this before processing the program headers
273 to allow the correct machine (as opposed to just the default
274 machine) to be set, making it possible for grok_prstatus and
275 grok_psinfo to rely on the mach setting. */
276 if (ebd
->elf_backend_object_p
!= NULL
277 && ! ebd
->elf_backend_object_p (abfd
))
280 /* Process each program header. */
281 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
282 if (! bfd_section_from_phdr (abfd
, i_phdrp
+ phindex
, (int) phindex
))
285 /* Check for core truncation. */
287 bfd_size_type high
= 0;
289 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
291 Elf_Internal_Phdr
*p
= i_phdrp
+ phindex
;
294 bfd_size_type current
= p
->p_offset
+ p
->p_filesz
;
299 if (bfd_stat (abfd
, &statbuf
) == 0)
301 if ((bfd_size_type
) statbuf
.st_size
< high
)
303 (*_bfd_error_handler
)
304 (_("Warning: %B is truncated: expected core file "
305 "size >= %lu, found: %lu."),
306 abfd
, (unsigned long) high
, (unsigned long) statbuf
.st_size
);
311 /* Save the entry point from the ELF header. */
312 bfd_get_start_address (abfd
) = i_ehdrp
->e_entry
;
316 bfd_set_error (bfd_error_wrong_format
);
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