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. */
22 #include "gdb_string.h"
28 /* This table matches the indices assigned to enum gdb_osabi. Keep
30 static const char * const gdb_osabi_names
[] =
57 gdbarch_osabi_name (enum gdb_osabi osabi
)
59 if (osabi
>= GDB_OSABI_UNKNOWN
&& osabi
< GDB_OSABI_INVALID
)
60 return gdb_osabi_names
[osabi
];
62 return gdb_osabi_names
[GDB_OSABI_INVALID
];
65 /* Handler for a given architecture/OS ABI pair. There should be only
66 one handler for a given OS ABI each architecture family. */
67 struct gdb_osabi_handler
69 struct gdb_osabi_handler
*next
;
70 enum bfd_architecture arch
;
72 void (*init_osabi
)(struct gdbarch_info
, struct gdbarch
*);
75 static struct gdb_osabi_handler
*gdb_osabi_handler_list
;
78 gdbarch_register_osabi (enum bfd_architecture arch
, enum gdb_osabi osabi
,
79 void (*init_osabi
)(struct gdbarch_info
,
82 struct gdb_osabi_handler
**handler_p
;
84 /* Registering an OS ABI handler for "unknown" is not allowed. */
85 if (osabi
== GDB_OSABI_UNKNOWN
)
89 "gdbarch_register_osabi: An attempt to register a handler for "
90 "OS ABI \"%s\" for architecture %s was made. The handler will "
92 gdbarch_osabi_name (osabi
),
93 bfd_printable_arch_mach (arch
, 0));
97 for (handler_p
= &gdb_osabi_handler_list
; *handler_p
!= NULL
;
98 handler_p
= &(*handler_p
)->next
)
100 if ((*handler_p
)->arch
== arch
101 && (*handler_p
)->osabi
== osabi
)
105 "gdbarch_register_osabi: A handler for OS ABI \"%s\" "
106 "has already been registered for architecture %s",
107 gdbarch_osabi_name (osabi
),
108 bfd_printable_arch_mach (arch
, 0));
109 /* If user wants to continue, override previous definition. */
110 (*handler_p
)->init_osabi
= init_osabi
;
116 = (struct gdb_osabi_handler
*) xmalloc (sizeof (struct gdb_osabi_handler
));
117 (*handler_p
)->next
= NULL
;
118 (*handler_p
)->arch
= arch
;
119 (*handler_p
)->osabi
= osabi
;
120 (*handler_p
)->init_osabi
= init_osabi
;
124 /* Sniffer to find the OS ABI for a given file's architecture and flavour.
125 It is legal to have multiple sniffers for each arch/flavour pair, to
126 disambiguate one OS's a.out from another, for example. The first sniffer
127 to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should
128 be careful to claim a file only if it knows for sure what it is. */
129 struct gdb_osabi_sniffer
131 struct gdb_osabi_sniffer
*next
;
132 enum bfd_architecture arch
; /* bfd_arch_unknown == wildcard */
133 enum bfd_flavour flavour
;
134 enum gdb_osabi (*sniffer
)(bfd
*);
137 static struct gdb_osabi_sniffer
*gdb_osabi_sniffer_list
;
140 gdbarch_register_osabi_sniffer (enum bfd_architecture arch
,
141 enum bfd_flavour flavour
,
142 enum gdb_osabi (*sniffer_fn
)(bfd
*))
144 struct gdb_osabi_sniffer
*sniffer
;
147 (struct gdb_osabi_sniffer
*) xmalloc (sizeof (struct gdb_osabi_sniffer
));
148 sniffer
->arch
= arch
;
149 sniffer
->flavour
= flavour
;
150 sniffer
->sniffer
= sniffer_fn
;
152 sniffer
->next
= gdb_osabi_sniffer_list
;
153 gdb_osabi_sniffer_list
= sniffer
;
158 gdbarch_lookup_osabi (bfd
*abfd
)
160 struct gdb_osabi_sniffer
*sniffer
;
161 enum gdb_osabi osabi
, match
;
164 match
= GDB_OSABI_UNKNOWN
;
167 for (sniffer
= gdb_osabi_sniffer_list
; sniffer
!= NULL
;
168 sniffer
= sniffer
->next
)
170 if ((sniffer
->arch
== bfd_arch_unknown
/* wildcard */
171 || sniffer
->arch
== bfd_get_arch (abfd
))
172 && sniffer
->flavour
== bfd_get_flavour (abfd
))
174 osabi
= (*sniffer
->sniffer
) (abfd
);
175 if (osabi
< GDB_OSABI_UNKNOWN
|| osabi
>= GDB_OSABI_INVALID
)
179 "gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer "
180 "for architecture %s flavour %d",
182 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
183 (int) bfd_get_flavour (abfd
));
185 else if (osabi
!= GDB_OSABI_UNKNOWN
)
187 /* A specific sniffer always overrides a generic sniffer.
188 Croak on multiple match if the two matches are of the
189 same class. If the user wishes to continue, we'll use
191 if (match
!= GDB_OSABI_UNKNOWN
)
193 if ((match_specific
&& sniffer
->arch
!= bfd_arch_unknown
)
194 || (!match_specific
&& sniffer
->arch
== bfd_arch_unknown
))
198 "gdbarch_lookup_osabi: multiple %sspecific OS ABI "
199 "match for architecture %s flavour %d: first "
200 "match \"%s\", second match \"%s\"",
201 match_specific
? "" : "non-",
202 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
203 (int) bfd_get_flavour (abfd
),
204 gdbarch_osabi_name (match
),
205 gdbarch_osabi_name (osabi
));
207 else if (sniffer
->arch
!= bfd_arch_unknown
)
216 if (sniffer
->arch
!= bfd_arch_unknown
)
227 gdbarch_init_osabi (struct gdbarch_info info
, struct gdbarch
*gdbarch
,
228 enum gdb_osabi osabi
)
230 struct gdb_osabi_handler
*handler
;
231 bfd
*abfd
= info
.abfd
;
232 const struct bfd_arch_info
*arch_info
= gdbarch_bfd_arch_info (gdbarch
);
234 if (osabi
== GDB_OSABI_UNKNOWN
)
236 /* Don't complain about an unknown OSABI. Assume the user knows
237 what they are doing. */
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
;
408 if (osabi
== GDB_OSABI_UNKNOWN
)
410 /* The FreeBSD folks have been naughty; they stored the string
411 "FreeBSD" in the padding of the e_ident field of the ELF
412 header to "brand" their ELF binaries in FreeBSD 3.x. */
413 if (strcmp (&elf_elfheader (abfd
)->e_ident
[8], "FreeBSD") == 0)
414 osabi
= GDB_OSABI_FREEBSD_ELF
;
422 _initialize_gdb_osabi (void)
424 if (strcmp (gdb_osabi_names
[GDB_OSABI_INVALID
], "<invalid>") != 0)
427 "_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent");
429 /* Register a generic sniffer for ELF flavoured files. */
430 gdbarch_register_osabi_sniffer (bfd_arch_unknown
,
431 bfd_target_elf_flavour
,
432 generic_elf_osabi_sniffer
);