1 /* OS ABI variant handling for GDB.
2 Copyright 2001, 2002 Free Software Foundation, Inc.
4 This file is part of GDB.
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,
19 Boston, MA 02111-1307, USA. */
27 /* This table matches the indices assigned to enum gdb_osabi. Keep
29 static const char * const gdb_osabi_names
[] =
52 gdbarch_osabi_name (enum gdb_osabi osabi
)
54 if (osabi
>= GDB_OSABI_UNKNOWN
&& osabi
< GDB_OSABI_INVALID
)
55 return gdb_osabi_names
[osabi
];
57 return gdb_osabi_names
[GDB_OSABI_INVALID
];
60 /* Handler for a given architecture/OS ABI pair. There should be only
61 one handler for a given OS ABI each architecture family. */
62 struct gdb_osabi_handler
64 struct gdb_osabi_handler
*next
;
65 enum bfd_architecture arch
;
67 void (*init_osabi
)(struct gdbarch_info
, struct gdbarch
*);
70 static struct gdb_osabi_handler
*gdb_osabi_handler_list
;
73 gdbarch_register_osabi (enum bfd_architecture arch
, enum gdb_osabi osabi
,
74 void (*init_osabi
)(struct gdbarch_info
,
77 struct gdb_osabi_handler
**handler_p
;
79 /* Registering an OS ABI handler for "unknown" is not allowed. */
80 if (osabi
== GDB_OSABI_UNKNOWN
)
84 "gdbarch_register_osabi: An attempt to register a handler for "
85 "OS ABI \"%s\" for architecture %s was made. The handler will "
87 gdbarch_osabi_name (osabi
),
88 bfd_printable_arch_mach (arch
, 0));
92 for (handler_p
= &gdb_osabi_handler_list
; *handler_p
!= NULL
;
93 handler_p
= &(*handler_p
)->next
)
95 if ((*handler_p
)->arch
== arch
96 && (*handler_p
)->osabi
== osabi
)
100 "gdbarch_register_osabi: A handler for OS ABI \"%s\" "
101 "has already been registered for architecture %s",
102 gdbarch_osabi_name (osabi
),
103 bfd_printable_arch_mach (arch
, 0));
104 /* If user wants to continue, override previous definition. */
105 (*handler_p
)->init_osabi
= init_osabi
;
111 = (struct gdb_osabi_handler
*) xmalloc (sizeof (struct gdb_osabi_handler
));
112 (*handler_p
)->next
= NULL
;
113 (*handler_p
)->arch
= arch
;
114 (*handler_p
)->osabi
= osabi
;
115 (*handler_p
)->init_osabi
= init_osabi
;
119 /* Sniffer to find the OS ABI for a given file's architecture and flavour.
120 It is legal to have multiple sniffers for each arch/flavour pair, to
121 disambiguate one OS's a.out from another, for example. The first sniffer
122 to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should
123 be careful to claim a file only if it knows for sure what it is. */
124 struct gdb_osabi_sniffer
126 struct gdb_osabi_sniffer
*next
;
127 enum bfd_architecture arch
; /* bfd_arch_unknown == wildcard */
128 enum bfd_flavour flavour
;
129 enum gdb_osabi (*sniffer
)(bfd
*);
132 static struct gdb_osabi_sniffer
*gdb_osabi_sniffer_list
;
135 gdbarch_register_osabi_sniffer (enum bfd_architecture arch
,
136 enum bfd_flavour flavour
,
137 enum gdb_osabi (*sniffer_fn
)(bfd
*))
139 struct gdb_osabi_sniffer
*sniffer
;
142 (struct gdb_osabi_sniffer
*) xmalloc (sizeof (struct gdb_osabi_sniffer
));
143 sniffer
->arch
= arch
;
144 sniffer
->flavour
= flavour
;
145 sniffer
->sniffer
= sniffer_fn
;
147 sniffer
->next
= gdb_osabi_sniffer_list
;
148 gdb_osabi_sniffer_list
= sniffer
;
153 gdbarch_lookup_osabi (bfd
*abfd
)
155 struct gdb_osabi_sniffer
*sniffer
;
156 enum gdb_osabi osabi
, match
;
159 match
= GDB_OSABI_UNKNOWN
;
162 for (sniffer
= gdb_osabi_sniffer_list
; sniffer
!= NULL
;
163 sniffer
= sniffer
->next
)
165 if ((sniffer
->arch
== bfd_arch_unknown
/* wildcard */
166 || sniffer
->arch
== bfd_get_arch (abfd
))
167 && sniffer
->flavour
== bfd_get_flavour (abfd
))
169 osabi
= (*sniffer
->sniffer
) (abfd
);
170 if (osabi
< GDB_OSABI_UNKNOWN
|| osabi
>= GDB_OSABI_INVALID
)
174 "gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer "
175 "for architecture %s flavour %d",
177 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
178 (int) bfd_get_flavour (abfd
));
180 else if (osabi
!= GDB_OSABI_UNKNOWN
)
182 /* A specific sniffer always overrides a generic sniffer.
183 Croak on multiple match if the two matches are of the
184 same class. If the user wishes to continue, we'll use
186 if (match
!= GDB_OSABI_UNKNOWN
)
188 if ((match_specific
&& sniffer
->arch
!= bfd_arch_unknown
)
189 || (!match_specific
&& sniffer
->arch
== bfd_arch_unknown
))
193 "gdbarch_lookup_osabi: multiple %sspecific OS ABI "
194 "match for architecture %s flavour %d: first "
195 "match \"%s\", second match \"%s\"",
196 match_specific
? "" : "non-",
197 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
198 (int) bfd_get_flavour (abfd
),
199 gdbarch_osabi_name (match
),
200 gdbarch_osabi_name (osabi
));
202 else if (sniffer
->arch
!= bfd_arch_unknown
)
211 if (sniffer
->arch
!= bfd_arch_unknown
)
222 gdbarch_init_osabi (struct gdbarch_info info
, struct gdbarch
*gdbarch
,
223 enum gdb_osabi osabi
)
225 struct gdb_osabi_handler
*handler
;
226 bfd
*abfd
= info
.abfd
;
227 const struct bfd_arch_info
*arch_info
= gdbarch_bfd_arch_info (gdbarch
);
229 if (osabi
== GDB_OSABI_UNKNOWN
)
231 /* Don't complain about not knowing the OS ABI if we don't
235 (gdb_stderr
, "GDB doesn't recognize the OS ABI of the inferior. "
236 "Attempting to continue with the default %s settings",
237 bfd_printable_arch_mach (arch_info
->arch
, arch_info
->mach
));
241 for (handler
= gdb_osabi_handler_list
; handler
!= NULL
;
242 handler
= handler
->next
)
244 if (handler
->arch
== bfd_get_arch (abfd
)
245 && handler
->osabi
== osabi
)
247 (*handler
->init_osabi
) (info
, gdbarch
);
252 /* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM
253 that an ABI variant can be supported by overriding definitions in
255 if (GDB_MULTI_ARCH
> GDB_MULTI_ARCH_PARTIAL
)
258 "A handler for the OS ABI \"%s\" is not built into this "
259 "configuration of GDB. "
260 "Attempting to continue with the default %s settings",
261 gdbarch_osabi_name (osabi
),
262 bfd_printable_arch_mach (arch_info
->arch
, arch_info
->mach
));
266 /* Generic sniffer for ELF flavoured files. */
269 generic_elf_osabi_sniff_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
271 enum gdb_osabi
*os_ident_ptr
= obj
;
273 unsigned int sectsize
;
275 name
= bfd_get_section_name (abfd
, sect
);
276 sectsize
= bfd_section_size (abfd
, sect
);
278 /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */
279 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
281 unsigned int name_length
, data_length
, note_type
;
284 /* If the section is larger than this, it's probably not what we are
289 note
= alloca (sectsize
);
291 bfd_get_section_contents (abfd
, sect
, note
,
292 (file_ptr
) 0, (bfd_size_type
) sectsize
);
294 name_length
= bfd_h_get_32 (abfd
, note
);
295 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
296 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
298 if (name_length
== 4 && data_length
== 16 && note_type
== NT_GNU_ABI_TAG
299 && strcmp (note
+ 12, "GNU") == 0)
301 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
305 case GNU_ABI_TAG_LINUX
:
306 *os_ident_ptr
= GDB_OSABI_LINUX
;
309 case GNU_ABI_TAG_HURD
:
310 *os_ident_ptr
= GDB_OSABI_HURD
;
313 case GNU_ABI_TAG_SOLARIS
:
314 *os_ident_ptr
= GDB_OSABI_SOLARIS
;
320 "generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d",
325 else if (name_length
== 8 && data_length
== 4
326 && note_type
== NT_FREEBSD_ABI_TAG
327 && strcmp (note
+ 12, "FreeBSD") == 0)
329 /* XXX Should we check the version here? Probably not
331 *os_ident_ptr
= GDB_OSABI_FREEBSD_ELF
;
336 /* .note.netbsd.ident notes, used by NetBSD. */
337 if (strcmp (name
, ".note.netbsd.ident") == 0 && sectsize
> 0)
339 unsigned int name_length
, data_length
, note_type
;
342 /* If the section is larger than this, it's probably not what we are
347 note
= alloca (sectsize
);
349 bfd_get_section_contents (abfd
, sect
, note
,
350 (file_ptr
) 0, (bfd_size_type
) sectsize
);
352 name_length
= bfd_h_get_32 (abfd
, note
);
353 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
354 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
356 if (name_length
== 7 && data_length
== 4 && note_type
== NT_NETBSD_IDENT
357 && strcmp (note
+ 12, "NetBSD") == 0)
359 /* XXX Should we check the version here? Probably not
361 *os_ident_ptr
= GDB_OSABI_NETBSD_ELF
;
367 static enum gdb_osabi
368 generic_elf_osabi_sniffer (bfd
*abfd
)
370 unsigned int elfosabi
;
371 enum gdb_osabi osabi
= GDB_OSABI_UNKNOWN
;
373 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
378 /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
379 file are conforming to the base specification for that machine
380 (there are no OS-specific extensions). In order to determine the
381 real OS in use we must look for OS notes that have been added. */
382 bfd_map_over_sections (abfd
,
383 generic_elf_osabi_sniff_abi_tag_sections
,
387 case ELFOSABI_FREEBSD
:
388 osabi
= GDB_OSABI_FREEBSD_ELF
;
391 case ELFOSABI_NETBSD
:
392 osabi
= GDB_OSABI_NETBSD_ELF
;
396 osabi
= GDB_OSABI_LINUX
;
400 osabi
= GDB_OSABI_HURD
;
403 case ELFOSABI_SOLARIS
:
404 osabi
= GDB_OSABI_SOLARIS
;
413 _initialize_gdb_osabi (void)
415 if (strcmp (gdb_osabi_names
[GDB_OSABI_INVALID
], "<invalid>") != 0)
418 "_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent");
420 /* Register a generic sniffer for ELF flavoured files. */
421 gdbarch_register_osabi_sniffer (bfd_arch_unknown
,
422 bfd_target_elf_flavour
,
423 generic_elf_osabi_sniffer
);