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
[] =
54 gdbarch_osabi_name (enum gdb_osabi osabi
)
56 if (osabi
>= GDB_OSABI_UNKNOWN
&& osabi
< GDB_OSABI_INVALID
)
57 return gdb_osabi_names
[osabi
];
59 return gdb_osabi_names
[GDB_OSABI_INVALID
];
62 /* Handler for a given architecture/OS ABI pair. There should be only
63 one handler for a given OS ABI each architecture family. */
64 struct gdb_osabi_handler
66 struct gdb_osabi_handler
*next
;
67 enum bfd_architecture arch
;
69 void (*init_osabi
)(struct gdbarch_info
, struct gdbarch
*);
72 static struct gdb_osabi_handler
*gdb_osabi_handler_list
;
75 gdbarch_register_osabi (enum bfd_architecture arch
, enum gdb_osabi osabi
,
76 void (*init_osabi
)(struct gdbarch_info
,
79 struct gdb_osabi_handler
**handler_p
;
81 /* Registering an OS ABI handler for "unknown" is not allowed. */
82 if (osabi
== GDB_OSABI_UNKNOWN
)
86 "gdbarch_register_osabi: An attempt to register a handler for "
87 "OS ABI \"%s\" for architecture %s was made. The handler will "
89 gdbarch_osabi_name (osabi
),
90 bfd_printable_arch_mach (arch
, 0));
94 for (handler_p
= &gdb_osabi_handler_list
; *handler_p
!= NULL
;
95 handler_p
= &(*handler_p
)->next
)
97 if ((*handler_p
)->arch
== arch
98 && (*handler_p
)->osabi
== osabi
)
102 "gdbarch_register_osabi: A handler for OS ABI \"%s\" "
103 "has already been registered for architecture %s",
104 gdbarch_osabi_name (osabi
),
105 bfd_printable_arch_mach (arch
, 0));
106 /* If user wants to continue, override previous definition. */
107 (*handler_p
)->init_osabi
= init_osabi
;
113 = (struct gdb_osabi_handler
*) xmalloc (sizeof (struct gdb_osabi_handler
));
114 (*handler_p
)->next
= NULL
;
115 (*handler_p
)->arch
= arch
;
116 (*handler_p
)->osabi
= osabi
;
117 (*handler_p
)->init_osabi
= init_osabi
;
121 /* Sniffer to find the OS ABI for a given file's architecture and flavour.
122 It is legal to have multiple sniffers for each arch/flavour pair, to
123 disambiguate one OS's a.out from another, for example. The first sniffer
124 to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should
125 be careful to claim a file only if it knows for sure what it is. */
126 struct gdb_osabi_sniffer
128 struct gdb_osabi_sniffer
*next
;
129 enum bfd_architecture arch
; /* bfd_arch_unknown == wildcard */
130 enum bfd_flavour flavour
;
131 enum gdb_osabi (*sniffer
)(bfd
*);
134 static struct gdb_osabi_sniffer
*gdb_osabi_sniffer_list
;
137 gdbarch_register_osabi_sniffer (enum bfd_architecture arch
,
138 enum bfd_flavour flavour
,
139 enum gdb_osabi (*sniffer_fn
)(bfd
*))
141 struct gdb_osabi_sniffer
*sniffer
;
144 (struct gdb_osabi_sniffer
*) xmalloc (sizeof (struct gdb_osabi_sniffer
));
145 sniffer
->arch
= arch
;
146 sniffer
->flavour
= flavour
;
147 sniffer
->sniffer
= sniffer_fn
;
149 sniffer
->next
= gdb_osabi_sniffer_list
;
150 gdb_osabi_sniffer_list
= sniffer
;
155 gdbarch_lookup_osabi (bfd
*abfd
)
157 struct gdb_osabi_sniffer
*sniffer
;
158 enum gdb_osabi osabi
, match
;
161 match
= GDB_OSABI_UNKNOWN
;
164 for (sniffer
= gdb_osabi_sniffer_list
; sniffer
!= NULL
;
165 sniffer
= sniffer
->next
)
167 if ((sniffer
->arch
== bfd_arch_unknown
/* wildcard */
168 || sniffer
->arch
== bfd_get_arch (abfd
))
169 && sniffer
->flavour
== bfd_get_flavour (abfd
))
171 osabi
= (*sniffer
->sniffer
) (abfd
);
172 if (osabi
< GDB_OSABI_UNKNOWN
|| osabi
>= GDB_OSABI_INVALID
)
176 "gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer "
177 "for architecture %s flavour %d",
179 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
180 (int) bfd_get_flavour (abfd
));
182 else if (osabi
!= GDB_OSABI_UNKNOWN
)
184 /* A specific sniffer always overrides a generic sniffer.
185 Croak on multiple match if the two matches are of the
186 same class. If the user wishes to continue, we'll use
188 if (match
!= GDB_OSABI_UNKNOWN
)
190 if ((match_specific
&& sniffer
->arch
!= bfd_arch_unknown
)
191 || (!match_specific
&& sniffer
->arch
== bfd_arch_unknown
))
195 "gdbarch_lookup_osabi: multiple %sspecific OS ABI "
196 "match for architecture %s flavour %d: first "
197 "match \"%s\", second match \"%s\"",
198 match_specific
? "" : "non-",
199 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
200 (int) bfd_get_flavour (abfd
),
201 gdbarch_osabi_name (match
),
202 gdbarch_osabi_name (osabi
));
204 else if (sniffer
->arch
!= bfd_arch_unknown
)
213 if (sniffer
->arch
!= bfd_arch_unknown
)
224 gdbarch_init_osabi (struct gdbarch_info info
, struct gdbarch
*gdbarch
,
225 enum gdb_osabi osabi
)
227 struct gdb_osabi_handler
*handler
;
228 bfd
*abfd
= info
.abfd
;
229 const struct bfd_arch_info
*arch_info
= gdbarch_bfd_arch_info (gdbarch
);
231 if (osabi
== GDB_OSABI_UNKNOWN
)
233 /* Don't complain about not knowing the OS ABI if we don't
237 (gdb_stderr
, "GDB doesn't recognize the OS ABI of the inferior. "
238 "Attempting to continue with the default %s settings",
239 bfd_printable_arch_mach (arch_info
->arch
, arch_info
->mach
));
243 for (handler
= gdb_osabi_handler_list
; handler
!= NULL
;
244 handler
= handler
->next
)
246 if (handler
->arch
== bfd_get_arch (abfd
)
247 && handler
->osabi
== osabi
)
249 (*handler
->init_osabi
) (info
, gdbarch
);
254 /* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM
255 that an ABI variant can be supported by overriding definitions in
257 if (GDB_MULTI_ARCH
> GDB_MULTI_ARCH_PARTIAL
)
260 "A handler for the OS ABI \"%s\" is not built into this "
261 "configuration of GDB. "
262 "Attempting to continue with the default %s settings",
263 gdbarch_osabi_name (osabi
),
264 bfd_printable_arch_mach (arch_info
->arch
, arch_info
->mach
));
268 /* Generic sniffer for ELF flavoured files. */
271 generic_elf_osabi_sniff_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
273 enum gdb_osabi
*os_ident_ptr
= obj
;
275 unsigned int sectsize
;
277 name
= bfd_get_section_name (abfd
, sect
);
278 sectsize
= bfd_section_size (abfd
, sect
);
280 /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */
281 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
283 unsigned int name_length
, data_length
, note_type
;
286 /* If the section is larger than this, it's probably not what we are
291 note
= alloca (sectsize
);
293 bfd_get_section_contents (abfd
, sect
, note
,
294 (file_ptr
) 0, (bfd_size_type
) sectsize
);
296 name_length
= bfd_h_get_32 (abfd
, note
);
297 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
298 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
300 if (name_length
== 4 && data_length
== 16 && note_type
== NT_GNU_ABI_TAG
301 && strcmp (note
+ 12, "GNU") == 0)
303 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
307 case GNU_ABI_TAG_LINUX
:
308 *os_ident_ptr
= GDB_OSABI_LINUX
;
311 case GNU_ABI_TAG_HURD
:
312 *os_ident_ptr
= GDB_OSABI_HURD
;
315 case GNU_ABI_TAG_SOLARIS
:
316 *os_ident_ptr
= GDB_OSABI_SOLARIS
;
322 "generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d",
327 else if (name_length
== 8 && data_length
== 4
328 && note_type
== NT_FREEBSD_ABI_TAG
329 && strcmp (note
+ 12, "FreeBSD") == 0)
331 /* XXX Should we check the version here? Probably not
333 *os_ident_ptr
= GDB_OSABI_FREEBSD_ELF
;
338 /* .note.netbsd.ident notes, used by NetBSD. */
339 if (strcmp (name
, ".note.netbsd.ident") == 0 && sectsize
> 0)
341 unsigned int name_length
, data_length
, note_type
;
344 /* If the section is larger than this, it's probably not what we are
349 note
= alloca (sectsize
);
351 bfd_get_section_contents (abfd
, sect
, note
,
352 (file_ptr
) 0, (bfd_size_type
) sectsize
);
354 name_length
= bfd_h_get_32 (abfd
, note
);
355 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
356 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
358 if (name_length
== 7 && data_length
== 4 && note_type
== NT_NETBSD_IDENT
359 && strcmp (note
+ 12, "NetBSD") == 0)
361 /* XXX Should we check the version here? Probably not
363 *os_ident_ptr
= GDB_OSABI_NETBSD_ELF
;
369 static enum gdb_osabi
370 generic_elf_osabi_sniffer (bfd
*abfd
)
372 unsigned int elfosabi
;
373 enum gdb_osabi osabi
= GDB_OSABI_UNKNOWN
;
375 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
380 /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
381 file are conforming to the base specification for that machine
382 (there are no OS-specific extensions). In order to determine the
383 real OS in use we must look for OS notes that have been added. */
384 bfd_map_over_sections (abfd
,
385 generic_elf_osabi_sniff_abi_tag_sections
,
389 case ELFOSABI_FREEBSD
:
390 osabi
= GDB_OSABI_FREEBSD_ELF
;
393 case ELFOSABI_NETBSD
:
394 osabi
= GDB_OSABI_NETBSD_ELF
;
398 osabi
= GDB_OSABI_LINUX
;
402 osabi
= GDB_OSABI_HURD
;
405 case ELFOSABI_SOLARIS
:
406 osabi
= GDB_OSABI_SOLARIS
;
415 _initialize_gdb_osabi (void)
417 if (strcmp (gdb_osabi_names
[GDB_OSABI_INVALID
], "<invalid>") != 0)
420 "_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent");
422 /* Register a generic sniffer for ELF flavoured files. */
423 gdbarch_register_osabi_sniffer (bfd_arch_unknown
,
424 bfd_target_elf_flavour
,
425 generic_elf_osabi_sniffer
);