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
[] =
56 gdbarch_osabi_name (enum gdb_osabi osabi
)
58 if (osabi
>= GDB_OSABI_UNKNOWN
&& osabi
< GDB_OSABI_INVALID
)
59 return gdb_osabi_names
[osabi
];
61 return gdb_osabi_names
[GDB_OSABI_INVALID
];
64 /* Handler for a given architecture/OS ABI pair. There should be only
65 one handler for a given OS ABI each architecture family. */
66 struct gdb_osabi_handler
68 struct gdb_osabi_handler
*next
;
69 enum bfd_architecture arch
;
71 void (*init_osabi
)(struct gdbarch_info
, struct gdbarch
*);
74 static struct gdb_osabi_handler
*gdb_osabi_handler_list
;
77 gdbarch_register_osabi (enum bfd_architecture arch
, enum gdb_osabi osabi
,
78 void (*init_osabi
)(struct gdbarch_info
,
81 struct gdb_osabi_handler
**handler_p
;
83 /* Registering an OS ABI handler for "unknown" is not allowed. */
84 if (osabi
== GDB_OSABI_UNKNOWN
)
88 "gdbarch_register_osabi: An attempt to register a handler for "
89 "OS ABI \"%s\" for architecture %s was made. The handler will "
91 gdbarch_osabi_name (osabi
),
92 bfd_printable_arch_mach (arch
, 0));
96 for (handler_p
= &gdb_osabi_handler_list
; *handler_p
!= NULL
;
97 handler_p
= &(*handler_p
)->next
)
99 if ((*handler_p
)->arch
== arch
100 && (*handler_p
)->osabi
== osabi
)
104 "gdbarch_register_osabi: A handler for OS ABI \"%s\" "
105 "has already been registered for architecture %s",
106 gdbarch_osabi_name (osabi
),
107 bfd_printable_arch_mach (arch
, 0));
108 /* If user wants to continue, override previous definition. */
109 (*handler_p
)->init_osabi
= init_osabi
;
115 = (struct gdb_osabi_handler
*) xmalloc (sizeof (struct gdb_osabi_handler
));
116 (*handler_p
)->next
= NULL
;
117 (*handler_p
)->arch
= arch
;
118 (*handler_p
)->osabi
= osabi
;
119 (*handler_p
)->init_osabi
= init_osabi
;
123 /* Sniffer to find the OS ABI for a given file's architecture and flavour.
124 It is legal to have multiple sniffers for each arch/flavour pair, to
125 disambiguate one OS's a.out from another, for example. The first sniffer
126 to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should
127 be careful to claim a file only if it knows for sure what it is. */
128 struct gdb_osabi_sniffer
130 struct gdb_osabi_sniffer
*next
;
131 enum bfd_architecture arch
; /* bfd_arch_unknown == wildcard */
132 enum bfd_flavour flavour
;
133 enum gdb_osabi (*sniffer
)(bfd
*);
136 static struct gdb_osabi_sniffer
*gdb_osabi_sniffer_list
;
139 gdbarch_register_osabi_sniffer (enum bfd_architecture arch
,
140 enum bfd_flavour flavour
,
141 enum gdb_osabi (*sniffer_fn
)(bfd
*))
143 struct gdb_osabi_sniffer
*sniffer
;
146 (struct gdb_osabi_sniffer
*) xmalloc (sizeof (struct gdb_osabi_sniffer
));
147 sniffer
->arch
= arch
;
148 sniffer
->flavour
= flavour
;
149 sniffer
->sniffer
= sniffer_fn
;
151 sniffer
->next
= gdb_osabi_sniffer_list
;
152 gdb_osabi_sniffer_list
= sniffer
;
157 gdbarch_lookup_osabi (bfd
*abfd
)
159 struct gdb_osabi_sniffer
*sniffer
;
160 enum gdb_osabi osabi
, match
;
163 match
= GDB_OSABI_UNKNOWN
;
166 for (sniffer
= gdb_osabi_sniffer_list
; sniffer
!= NULL
;
167 sniffer
= sniffer
->next
)
169 if ((sniffer
->arch
== bfd_arch_unknown
/* wildcard */
170 || sniffer
->arch
== bfd_get_arch (abfd
))
171 && sniffer
->flavour
== bfd_get_flavour (abfd
))
173 osabi
= (*sniffer
->sniffer
) (abfd
);
174 if (osabi
< GDB_OSABI_UNKNOWN
|| osabi
>= GDB_OSABI_INVALID
)
178 "gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer "
179 "for architecture %s flavour %d",
181 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
182 (int) bfd_get_flavour (abfd
));
184 else if (osabi
!= GDB_OSABI_UNKNOWN
)
186 /* A specific sniffer always overrides a generic sniffer.
187 Croak on multiple match if the two matches are of the
188 same class. If the user wishes to continue, we'll use
190 if (match
!= GDB_OSABI_UNKNOWN
)
192 if ((match_specific
&& sniffer
->arch
!= bfd_arch_unknown
)
193 || (!match_specific
&& sniffer
->arch
== bfd_arch_unknown
))
197 "gdbarch_lookup_osabi: multiple %sspecific OS ABI "
198 "match for architecture %s flavour %d: first "
199 "match \"%s\", second match \"%s\"",
200 match_specific
? "" : "non-",
201 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
202 (int) bfd_get_flavour (abfd
),
203 gdbarch_osabi_name (match
),
204 gdbarch_osabi_name (osabi
));
206 else if (sniffer
->arch
!= bfd_arch_unknown
)
215 if (sniffer
->arch
!= bfd_arch_unknown
)
226 gdbarch_init_osabi (struct gdbarch_info info
, struct gdbarch
*gdbarch
,
227 enum gdb_osabi osabi
)
229 struct gdb_osabi_handler
*handler
;
230 bfd
*abfd
= info
.abfd
;
231 const struct bfd_arch_info
*arch_info
= gdbarch_bfd_arch_info (gdbarch
);
233 if (osabi
== GDB_OSABI_UNKNOWN
)
235 /* Don't complain about not knowing the OS ABI if we don't
239 (gdb_stderr
, "GDB doesn't recognize the OS ABI of the inferior. "
240 "Attempting to continue with the default %s settings",
241 bfd_printable_arch_mach (arch_info
->arch
, arch_info
->mach
));
245 for (handler
= gdb_osabi_handler_list
; handler
!= NULL
;
246 handler
= handler
->next
)
248 if (handler
->arch
== bfd_get_arch (abfd
)
249 && handler
->osabi
== osabi
)
251 (*handler
->init_osabi
) (info
, gdbarch
);
256 /* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM
257 that an ABI variant can be supported by overriding definitions in
259 if (GDB_MULTI_ARCH
> GDB_MULTI_ARCH_PARTIAL
)
262 "A handler for the OS ABI \"%s\" is not built into this "
263 "configuration of GDB. "
264 "Attempting to continue with the default %s settings",
265 gdbarch_osabi_name (osabi
),
266 bfd_printable_arch_mach (arch_info
->arch
, arch_info
->mach
));
270 /* Generic sniffer for ELF flavoured files. */
273 generic_elf_osabi_sniff_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
275 enum gdb_osabi
*os_ident_ptr
= obj
;
277 unsigned int sectsize
;
279 name
= bfd_get_section_name (abfd
, sect
);
280 sectsize
= bfd_section_size (abfd
, sect
);
282 /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */
283 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
285 unsigned int name_length
, data_length
, note_type
;
288 /* If the section is larger than this, it's probably not what we are
293 note
= alloca (sectsize
);
295 bfd_get_section_contents (abfd
, sect
, note
,
296 (file_ptr
) 0, (bfd_size_type
) sectsize
);
298 name_length
= bfd_h_get_32 (abfd
, note
);
299 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
300 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
302 if (name_length
== 4 && data_length
== 16 && note_type
== NT_GNU_ABI_TAG
303 && strcmp (note
+ 12, "GNU") == 0)
305 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
309 case GNU_ABI_TAG_LINUX
:
310 *os_ident_ptr
= GDB_OSABI_LINUX
;
313 case GNU_ABI_TAG_HURD
:
314 *os_ident_ptr
= GDB_OSABI_HURD
;
317 case GNU_ABI_TAG_SOLARIS
:
318 *os_ident_ptr
= GDB_OSABI_SOLARIS
;
324 "generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d",
329 else if (name_length
== 8 && data_length
== 4
330 && note_type
== NT_FREEBSD_ABI_TAG
331 && strcmp (note
+ 12, "FreeBSD") == 0)
333 /* XXX Should we check the version here? Probably not
335 *os_ident_ptr
= GDB_OSABI_FREEBSD_ELF
;
340 /* .note.netbsd.ident notes, used by NetBSD. */
341 if (strcmp (name
, ".note.netbsd.ident") == 0 && sectsize
> 0)
343 unsigned int name_length
, data_length
, note_type
;
346 /* If the section is larger than this, it's probably not what we are
351 note
= alloca (sectsize
);
353 bfd_get_section_contents (abfd
, sect
, note
,
354 (file_ptr
) 0, (bfd_size_type
) sectsize
);
356 name_length
= bfd_h_get_32 (abfd
, note
);
357 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
358 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
360 if (name_length
== 7 && data_length
== 4 && note_type
== NT_NETBSD_IDENT
361 && strcmp (note
+ 12, "NetBSD") == 0)
363 /* XXX Should we check the version here? Probably not
365 *os_ident_ptr
= GDB_OSABI_NETBSD_ELF
;
371 static enum gdb_osabi
372 generic_elf_osabi_sniffer (bfd
*abfd
)
374 unsigned int elfosabi
;
375 enum gdb_osabi osabi
= GDB_OSABI_UNKNOWN
;
377 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
382 /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
383 file are conforming to the base specification for that machine
384 (there are no OS-specific extensions). In order to determine the
385 real OS in use we must look for OS notes that have been added. */
386 bfd_map_over_sections (abfd
,
387 generic_elf_osabi_sniff_abi_tag_sections
,
391 case ELFOSABI_FREEBSD
:
392 osabi
= GDB_OSABI_FREEBSD_ELF
;
395 case ELFOSABI_NETBSD
:
396 osabi
= GDB_OSABI_NETBSD_ELF
;
400 osabi
= GDB_OSABI_LINUX
;
404 osabi
= GDB_OSABI_HURD
;
407 case ELFOSABI_SOLARIS
:
408 osabi
= GDB_OSABI_SOLARIS
;
412 if (osabi
== GDB_OSABI_UNKNOWN
)
414 /* The FreeBSD folks have been naughty; they stored the string
415 "FreeBSD" in the padding of the e_ident field of the ELF
416 header to "brand" their ELF binaries in FreeBSD 3.x. */
417 if (strcmp (&elf_elfheader (abfd
)->e_ident
[8], "FreeBSD") == 0)
418 osabi
= GDB_OSABI_FREEBSD_ELF
;
426 _initialize_gdb_osabi (void)
428 if (strcmp (gdb_osabi_names
[GDB_OSABI_INVALID
], "<invalid>") != 0)
431 "_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent");
433 /* Register a generic sniffer for ELF flavoured files. */
434 gdbarch_register_osabi_sniffer (bfd_arch_unknown
,
435 bfd_target_elf_flavour
,
436 generic_elf_osabi_sniffer
);