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
= NULL
; /* Elf program header, internal form */
86 struct elf_backend_data
*ebd
;
87 struct elf_obj_tdata
*preserved_tdata
= elf_tdata (abfd
);
88 struct elf_obj_tdata
*new_tdata
= NULL
;
90 /* Read in the ELF header in external format. */
91 if (bfd_read ((PTR
) & x_ehdr
, sizeof (x_ehdr
), 1, abfd
) != sizeof (x_ehdr
))
93 if (bfd_get_error () != bfd_error_system_call
)
94 bfd_set_error (bfd_error_wrong_format
);
98 /* Check the magic number. */
99 if (elf_file_p (&x_ehdr
) == false)
102 /* FIXME: Check EI_VERSION here ! */
104 /* Check the address size ("class"). */
105 if (x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
108 /* Check the byteorder. */
109 switch (x_ehdr
.e_ident
[EI_DATA
])
111 case ELFDATA2MSB
: /* Big-endian */
112 if (! bfd_big_endian (abfd
))
115 case ELFDATA2LSB
: /* Little-endian */
116 if (! bfd_little_endian (abfd
))
123 /* Give abfd an elf_obj_tdata. */
125 (struct elf_obj_tdata
*) bfd_zalloc (abfd
, sizeof (struct elf_obj_tdata
));
126 if (new_tdata
== NULL
)
128 elf_tdata (abfd
) = new_tdata
;
130 /* Swap in the rest of the header, now that we have the byte order. */
131 i_ehdrp
= elf_elfheader (abfd
);
132 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
135 elf_debug_file (i_ehdrp
);
138 ebd
= get_elf_backend_data (abfd
);
140 /* Check that the ELF e_machine field matches what this particular
141 BFD format expects. */
143 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
144 && (ebd
->elf_machine_alt1
== 0
145 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
146 && (ebd
->elf_machine_alt2
== 0
147 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
))
149 const bfd_target
* const *target_ptr
;
151 if (ebd
->elf_machine_code
!= EM_NONE
)
154 /* This is the generic ELF target. Let it match any ELF target
155 for which we do not have a specific backend. */
157 for (target_ptr
= bfd_target_vector
; *target_ptr
!= NULL
; target_ptr
++)
159 struct elf_backend_data
*back
;
161 if ((*target_ptr
)->flavour
!= bfd_target_elf_flavour
)
163 back
= (struct elf_backend_data
*) (*target_ptr
)->backend_data
;
164 if (back
->elf_machine_code
== i_ehdrp
->e_machine
)
166 /* target_ptr is an ELF backend which matches this
167 object file, so reject the generic ELF target. */
173 /* If there is no program header, or the type is not a core file, then
175 if (i_ehdrp
->e_phoff
== 0 || i_ehdrp
->e_type
!= ET_CORE
)
178 /* Does BFD's idea of the phdr size match the size
179 recorded in the file? */
180 if (i_ehdrp
->e_phentsize
!= sizeof (Elf_External_Phdr
))
183 /* Move to the start of the program headers. */
184 if (bfd_seek (abfd
, i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
187 /* Allocate space for the program headers. */
188 i_phdrp
= (Elf_Internal_Phdr
*)
189 bfd_alloc (abfd
, sizeof (*i_phdrp
) * i_ehdrp
->e_phnum
);
193 elf_tdata (abfd
)->phdr
= i_phdrp
;
195 /* Read and convert to internal form. */
196 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
198 Elf_External_Phdr x_phdr
;
199 if (bfd_read ((PTR
) &x_phdr
, sizeof (x_phdr
), 1, abfd
)
203 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdrp
+ phindex
);
206 /* Process each program header. */
207 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
209 if (!_bfd_elfcore_section_from_phdr (abfd
, i_phdrp
+ phindex
, phindex
))
213 /* Set the machine architecture. */
214 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0))
216 /* It's OK if this fails for the generic target. */
217 if (ebd
->elf_machine_code
!= EM_NONE
)
221 /* Save the entry point from the ELF header. */
222 bfd_get_start_address (abfd
) = i_ehdrp
->e_entry
;
224 /* Let the backend double check the format and override global
226 if (ebd
->elf_backend_object_p
)
228 if ((*ebd
->elf_backend_object_p
) (abfd
) == false)
235 bfd_set_error (bfd_error_wrong_format
);
238 bfd_release (abfd
, i_phdrp
);
239 if (new_tdata
!= NULL
)
240 bfd_release (abfd
, new_tdata
);
241 elf_tdata (abfd
) = preserved_tdata
;
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