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. */
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
;
37 elf_core_file_matches_executable_p (core_bfd
, exec_bfd
)
43 /* xvecs must match if both are ELF files for the same target. */
45 if (core_bfd
->xvec
!= exec_bfd
->xvec
)
47 bfd_set_error (bfd_error_system_call
);
51 /* 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
, '/');
57 execname
= execname
? execname
+ 1 : exec_bfd
->filename
;
59 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).
81 elf_core_file_p (abfd
)
84 Elf_External_Ehdr x_ehdr
; /* Elf file header, external form */
85 Elf_Internal_Ehdr
*i_ehdrp
; /* Elf file header, internal form */
86 Elf_Internal_Phdr
*i_phdrp
= NULL
; /* Elf program header, internal form */
88 struct elf_backend_data
*ebd
;
89 struct elf_obj_tdata
*preserved_tdata
= elf_tdata (abfd
);
90 struct elf_obj_tdata
*new_tdata
= NULL
;
92 /* Read in the ELF header in external format. */
93 if (bfd_read ((PTR
) & x_ehdr
, sizeof (x_ehdr
), 1, abfd
) != sizeof (x_ehdr
))
95 if (bfd_get_error () != bfd_error_system_call
)
96 bfd_set_error (bfd_error_wrong_format
);
100 /* Check the magic number. */
101 if (elf_file_p (&x_ehdr
) == false)
104 /* FIXME: Check EI_VERSION here ! */
106 /* Check the address size ("class"). */
107 if (x_ehdr
.e_ident
[EI_CLASS
] != ELFCLASS
)
110 /* Check the byteorder. */
111 switch (x_ehdr
.e_ident
[EI_DATA
])
113 case ELFDATA2MSB
: /* Big-endian */
114 if (! bfd_big_endian (abfd
))
117 case ELFDATA2LSB
: /* Little-endian */
118 if (! bfd_little_endian (abfd
))
125 /* Give abfd an elf_obj_tdata. */
127 (struct elf_obj_tdata
*) bfd_zalloc (abfd
, sizeof (struct elf_obj_tdata
));
128 if (new_tdata
== NULL
)
130 elf_tdata (abfd
) = new_tdata
;
132 /* Swap in the rest of the header, now that we have the byte order. */
133 i_ehdrp
= elf_elfheader (abfd
);
134 elf_swap_ehdr_in (abfd
, &x_ehdr
, i_ehdrp
);
137 elf_debug_file (i_ehdrp
);
140 ebd
= get_elf_backend_data (abfd
);
142 /* Check that the ELF e_machine field matches what this particular
143 BFD format expects. */
145 if (ebd
->elf_machine_code
!= i_ehdrp
->e_machine
146 && (ebd
->elf_machine_alt1
== 0
147 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt1
)
148 && (ebd
->elf_machine_alt2
== 0
149 || i_ehdrp
->e_machine
!= ebd
->elf_machine_alt2
))
151 const bfd_target
* const *target_ptr
;
153 if (ebd
->elf_machine_code
!= EM_NONE
)
156 /* This is the generic ELF target. Let it match any ELF target
157 for which we do not have a specific backend. */
159 for (target_ptr
= bfd_target_vector
; *target_ptr
!= NULL
; target_ptr
++)
161 struct elf_backend_data
*back
;
163 if ((*target_ptr
)->flavour
!= bfd_target_elf_flavour
)
165 back
= (struct elf_backend_data
*) (*target_ptr
)->backend_data
;
166 if (back
->elf_machine_code
== i_ehdrp
->e_machine
)
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 /* Allocate space for the program headers. */
186 i_phdrp
= (Elf_Internal_Phdr
*)
187 bfd_alloc (abfd
, sizeof (*i_phdrp
) * i_ehdrp
->e_phnum
);
191 elf_tdata (abfd
)->phdr
= i_phdrp
;
193 /* Read and convert to internal form. */
194 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
196 Elf_External_Phdr x_phdr
;
197 if (bfd_read ((PTR
) &x_phdr
, sizeof (x_phdr
), 1, abfd
)
201 elf_swap_phdr_in (abfd
, &x_phdr
, i_phdrp
+ phindex
);
204 /* Process each program header. */
205 for (phindex
= 0; phindex
< i_ehdrp
->e_phnum
; ++phindex
)
207 if (!_bfd_elfcore_section_from_phdr (abfd
, i_phdrp
+ phindex
, phindex
))
211 /* Set the machine architecture. */
212 if (! bfd_default_set_arch_mach (abfd
, ebd
->arch
, 0))
214 /* It's OK if this fails for the generic target. */
215 if (ebd
->elf_machine_code
!= EM_NONE
)
219 /* Save the entry point from the ELF header. */
220 bfd_get_start_address (abfd
) = i_ehdrp
->e_entry
;
222 /* Let the backend double check the format and override global
224 if (ebd
->elf_backend_object_p
)
226 if ((*ebd
->elf_backend_object_p
) (abfd
) == false)
233 bfd_set_error (bfd_error_wrong_format
);
236 bfd_release (abfd
, i_phdrp
);
237 if (new_tdata
!= NULL
)
238 bfd_release (abfd
, new_tdata
);
239 elf_tdata (abfd
) = preserved_tdata
;
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