1 /* ELF core file support for BFD.
2 Copyright (C) 1995, 1996, 1997, 1998 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 elf_core_file_failing_command (abfd
)
24 return elf_tdata (abfd
)->core_command
;
28 elf_core_file_failing_signal (abfd
)
31 return elf_tdata (abfd
)->core_signal
;
35 elf_core_file_matches_executable_p (core_bfd
, exec_bfd
)
41 /* xvecs must match if both are ELF files for the same target. */
43 if (core_bfd
->xvec
!= exec_bfd
->xvec
)
45 bfd_set_error (bfd_error_system_call
);
49 /* 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
, '/');
55 execname
= execname
? execname
+ 1 : exec_bfd
->filename
;
57 if (strcmp(execname
, corename
) != 0)
64 /* Core files are simply standard ELF formatted files that partition
65 the file using the execution view of the file (program header table)
66 rather than the linking view. In fact, there is no section header
69 The process status information (including the contents of the general
70 register set) and the floating point register set are stored in a
71 segment of type PT_NOTE. We handcraft a couple of extra bfd sections
72 that allow standard bfd access to the general registers (.reg) and the
73 floating point registers (.reg2).
78 elf_core_file_p (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
= NULL
; /* Elf program header, internal form */
85 struct elf_backend_data
*ebd
;
86 struct elf_obj_tdata
*preserved_tdata
= elf_tdata (abfd
);
87 struct elf_obj_tdata
*new_tdata
= NULL
;
89 /* Read in the ELF header in external format. */
90 if (bfd_read ((PTR
) & x_ehdr
, sizeof (x_ehdr
), 1, abfd
) != sizeof (x_ehdr
))
92 if (bfd_get_error () != bfd_error_system_call
)
93 bfd_set_error (bfd_error_wrong_format
);
97 /* Check the magic number. */
98 if (elf_file_p (&x_ehdr
) == false)
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. */
124 (struct elf_obj_tdata
*) bfd_zalloc (abfd
, sizeof (struct elf_obj_tdata
));
125 if (new_tdata
== NULL
)
127 elf_tdata (abfd
) = new_tdata
;
129 /* Swap in the rest of the header, now that we have the byte order. */
130 i_ehdrp
= elf_elfheader (abfd
);
131 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
134 elf_debug_file (i_ehdrp
);
137 ebd
= get_elf_backend_data (abfd
);
139 /* Check that the ELF e_machine field matches what this particular
140 BFD format expects. */
142 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
143 && (ebd
->elf_machine_alt1
== 0
144 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
145 && (ebd
->elf_machine_alt2
== 0
146 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
))
148 const bfd_target
* const *target_ptr
;
150 if (ebd
->elf_machine_code
!= EM_NONE
)
153 /* This is the generic ELF target. Let it match any ELF target
154 for which we do not have a specific backend. */
156 for (target_ptr
= bfd_target_vector
; *target_ptr
!= NULL
; target_ptr
++)
158 struct elf_backend_data
*back
;
160 if ((*target_ptr
)->flavour
!= bfd_target_elf_flavour
)
162 back
= (struct elf_backend_data
*) (*target_ptr
)->backend_data
;
163 if (back
->elf_machine_code
== i_ehdrp
->e_machine
)
165 /* target_ptr is an ELF backend which matches this
166 object file, so reject the generic ELF target. */
172 /* If there is no program header, or the type is not a core file, then
174 if (i_ehdrp
->e_phoff
== 0 || i_ehdrp
->e_type
!= ET_CORE
)
177 /* Does BFD's idea of the phdr size match the size
178 recorded in the file? */
179 if (i_ehdrp
->e_phentsize
!= sizeof (Elf_External_Phdr
))
182 /* Move to the start of the program headers. */
183 if (bfd_seek (abfd
, i_ehdrp
->e_phoff
, SEEK_SET
) != 0)
186 /* Allocate space for the program headers. */
187 i_phdrp
= (Elf_Internal_Phdr
*)
188 bfd_alloc (abfd
, sizeof (*i_phdrp
) * i_ehdrp
->e_phnum
);
192 elf_tdata (abfd
)->phdr
= i_phdrp
;
194 /* Read and convert to internal form. */
195 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
197 Elf_External_Phdr x_phdr
;
198 if (bfd_read ((PTR
) &x_phdr
, sizeof (x_phdr
), 1, abfd
)
202 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdrp
+ phindex
);
205 /* Process each program header. */
206 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
208 if (!_bfd_elfcore_section_from_phdr (abfd
, i_phdrp
+ phindex
, phindex
))
212 /* Set the machine architecture. */
213 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0))
215 /* It's OK if this fails for the generic target. */
216 if (ebd
->elf_machine_code
!= EM_NONE
)
220 /* Save the entry point from the ELF header. */
221 bfd_get_start_address (abfd
) = i_ehdrp
->e_entry
;
223 /* Let the backend double check the format and override global
225 if (ebd
->elf_backend_object_p
)
227 if ((*ebd
->elf_backend_object_p
) (abfd
) == false)
234 bfd_set_error (bfd_error_wrong_format
);
237 bfd_release (abfd
, i_phdrp
);
238 if (new_tdata
!= NULL
)
239 bfd_release (abfd
, new_tdata
);
240 elf_tdata (abfd
) = preserved_tdata
;
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