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
[] =
58 gdbarch_osabi_name (enum gdb_osabi osabi
)
60 if (osabi
>= GDB_OSABI_UNKNOWN
&& osabi
< GDB_OSABI_INVALID
)
61 return gdb_osabi_names
[osabi
];
63 return gdb_osabi_names
[GDB_OSABI_INVALID
];
66 /* Handler for a given architecture/OS ABI pair. There should be only
67 one handler for a given OS ABI each architecture family. */
68 struct gdb_osabi_handler
70 struct gdb_osabi_handler
*next
;
71 enum bfd_architecture arch
;
73 void (*init_osabi
)(struct gdbarch_info
, struct gdbarch
*);
76 static struct gdb_osabi_handler
*gdb_osabi_handler_list
;
79 gdbarch_register_osabi (enum bfd_architecture arch
, enum gdb_osabi osabi
,
80 void (*init_osabi
)(struct gdbarch_info
,
83 struct gdb_osabi_handler
**handler_p
;
85 /* Registering an OS ABI handler for "unknown" is not allowed. */
86 if (osabi
== GDB_OSABI_UNKNOWN
)
90 "gdbarch_register_osabi: An attempt to register a handler for "
91 "OS ABI \"%s\" for architecture %s was made. The handler will "
93 gdbarch_osabi_name (osabi
),
94 bfd_printable_arch_mach (arch
, 0));
98 for (handler_p
= &gdb_osabi_handler_list
; *handler_p
!= NULL
;
99 handler_p
= &(*handler_p
)->next
)
101 if ((*handler_p
)->arch
== arch
102 && (*handler_p
)->osabi
== osabi
)
106 "gdbarch_register_osabi: A handler for OS ABI \"%s\" "
107 "has already been registered for architecture %s",
108 gdbarch_osabi_name (osabi
),
109 bfd_printable_arch_mach (arch
, 0));
110 /* If user wants to continue, override previous definition. */
111 (*handler_p
)->init_osabi
= init_osabi
;
117 = (struct gdb_osabi_handler
*) xmalloc (sizeof (struct gdb_osabi_handler
));
118 (*handler_p
)->next
= NULL
;
119 (*handler_p
)->arch
= arch
;
120 (*handler_p
)->osabi
= osabi
;
121 (*handler_p
)->init_osabi
= init_osabi
;
125 /* Sniffer to find the OS ABI for a given file's architecture and flavour.
126 It is legal to have multiple sniffers for each arch/flavour pair, to
127 disambiguate one OS's a.out from another, for example. The first sniffer
128 to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should
129 be careful to claim a file only if it knows for sure what it is. */
130 struct gdb_osabi_sniffer
132 struct gdb_osabi_sniffer
*next
;
133 enum bfd_architecture arch
; /* bfd_arch_unknown == wildcard */
134 enum bfd_flavour flavour
;
135 enum gdb_osabi (*sniffer
)(bfd
*);
138 static struct gdb_osabi_sniffer
*gdb_osabi_sniffer_list
;
141 gdbarch_register_osabi_sniffer (enum bfd_architecture arch
,
142 enum bfd_flavour flavour
,
143 enum gdb_osabi (*sniffer_fn
)(bfd
*))
145 struct gdb_osabi_sniffer
*sniffer
;
148 (struct gdb_osabi_sniffer
*) xmalloc (sizeof (struct gdb_osabi_sniffer
));
149 sniffer
->arch
= arch
;
150 sniffer
->flavour
= flavour
;
151 sniffer
->sniffer
= sniffer_fn
;
153 sniffer
->next
= gdb_osabi_sniffer_list
;
154 gdb_osabi_sniffer_list
= sniffer
;
159 gdbarch_lookup_osabi (bfd
*abfd
)
161 struct gdb_osabi_sniffer
*sniffer
;
162 enum gdb_osabi osabi
, match
;
165 match
= GDB_OSABI_UNKNOWN
;
168 for (sniffer
= gdb_osabi_sniffer_list
; sniffer
!= NULL
;
169 sniffer
= sniffer
->next
)
171 if ((sniffer
->arch
== bfd_arch_unknown
/* wildcard */
172 || sniffer
->arch
== bfd_get_arch (abfd
))
173 && sniffer
->flavour
== bfd_get_flavour (abfd
))
175 osabi
= (*sniffer
->sniffer
) (abfd
);
176 if (osabi
< GDB_OSABI_UNKNOWN
|| osabi
>= GDB_OSABI_INVALID
)
180 "gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer "
181 "for architecture %s flavour %d",
183 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
184 (int) bfd_get_flavour (abfd
));
186 else if (osabi
!= GDB_OSABI_UNKNOWN
)
188 /* A specific sniffer always overrides a generic sniffer.
189 Croak on multiple match if the two matches are of the
190 same class. If the user wishes to continue, we'll use
192 if (match
!= GDB_OSABI_UNKNOWN
)
194 if ((match_specific
&& sniffer
->arch
!= bfd_arch_unknown
)
195 || (!match_specific
&& sniffer
->arch
== bfd_arch_unknown
))
199 "gdbarch_lookup_osabi: multiple %sspecific OS ABI "
200 "match for architecture %s flavour %d: first "
201 "match \"%s\", second match \"%s\"",
202 match_specific
? "" : "non-",
203 bfd_printable_arch_mach (bfd_get_arch (abfd
), 0),
204 (int) bfd_get_flavour (abfd
),
205 gdbarch_osabi_name (match
),
206 gdbarch_osabi_name (osabi
));
208 else if (sniffer
->arch
!= bfd_arch_unknown
)
217 if (sniffer
->arch
!= bfd_arch_unknown
)
228 gdbarch_init_osabi (struct gdbarch_info info
, struct gdbarch
*gdbarch
,
229 enum gdb_osabi osabi
)
231 struct gdb_osabi_handler
*handler
;
232 bfd
*abfd
= info
.abfd
;
233 const struct bfd_arch_info
*arch_info
= gdbarch_bfd_arch_info (gdbarch
);
235 if (osabi
== GDB_OSABI_UNKNOWN
)
237 /* Don't complain about an unknown OSABI. Assume the user knows
238 what they are doing. */
242 for (handler
= gdb_osabi_handler_list
; handler
!= NULL
;
243 handler
= handler
->next
)
245 if (handler
->arch
== bfd_get_arch (abfd
)
246 && handler
->osabi
== osabi
)
248 (*handler
->init_osabi
) (info
, gdbarch
);
253 /* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM
254 that an ABI variant can be supported by overriding definitions in
256 if (GDB_MULTI_ARCH
> GDB_MULTI_ARCH_PARTIAL
)
259 "A handler for the OS ABI \"%s\" is not built into this "
260 "configuration of GDB. "
261 "Attempting to continue with the default %s settings",
262 gdbarch_osabi_name (osabi
),
263 bfd_printable_arch_mach (arch_info
->arch
, arch_info
->mach
));
267 /* Generic sniffer for ELF flavoured files. */
270 generic_elf_osabi_sniff_abi_tag_sections (bfd
*abfd
, asection
*sect
, void *obj
)
272 enum gdb_osabi
*os_ident_ptr
= obj
;
274 unsigned int sectsize
;
276 name
= bfd_get_section_name (abfd
, sect
);
277 sectsize
= bfd_section_size (abfd
, sect
);
279 /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */
280 if (strcmp (name
, ".note.ABI-tag") == 0 && sectsize
> 0)
282 unsigned int name_length
, data_length
, note_type
;
285 /* If the section is larger than this, it's probably not what we are
290 note
= alloca (sectsize
);
292 bfd_get_section_contents (abfd
, sect
, note
,
293 (file_ptr
) 0, (bfd_size_type
) sectsize
);
295 name_length
= bfd_h_get_32 (abfd
, note
);
296 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
297 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
299 if (name_length
== 4 && data_length
== 16 && note_type
== NT_GNU_ABI_TAG
300 && strcmp (note
+ 12, "GNU") == 0)
302 int os_number
= bfd_h_get_32 (abfd
, note
+ 16);
306 case GNU_ABI_TAG_LINUX
:
307 *os_ident_ptr
= GDB_OSABI_LINUX
;
310 case GNU_ABI_TAG_HURD
:
311 *os_ident_ptr
= GDB_OSABI_HURD
;
314 case GNU_ABI_TAG_SOLARIS
:
315 *os_ident_ptr
= GDB_OSABI_SOLARIS
;
321 "generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d",
326 else if (name_length
== 8 && data_length
== 4
327 && note_type
== NT_FREEBSD_ABI_TAG
328 && strcmp (note
+ 12, "FreeBSD") == 0)
330 /* XXX Should we check the version here? Probably not
332 *os_ident_ptr
= GDB_OSABI_FREEBSD_ELF
;
337 /* .note.netbsd.ident notes, used by NetBSD. */
338 if (strcmp (name
, ".note.netbsd.ident") == 0 && sectsize
> 0)
340 unsigned int name_length
, data_length
, note_type
;
343 /* If the section is larger than this, it's probably not what we are
348 note
= alloca (sectsize
);
350 bfd_get_section_contents (abfd
, sect
, note
,
351 (file_ptr
) 0, (bfd_size_type
) sectsize
);
353 name_length
= bfd_h_get_32 (abfd
, note
);
354 data_length
= bfd_h_get_32 (abfd
, note
+ 4);
355 note_type
= bfd_h_get_32 (abfd
, note
+ 8);
357 if (name_length
== 7 && data_length
== 4 && note_type
== NT_NETBSD_IDENT
358 && strcmp (note
+ 12, "NetBSD") == 0)
360 /* XXX Should we check the version here? Probably not
362 *os_ident_ptr
= GDB_OSABI_NETBSD_ELF
;
368 static enum gdb_osabi
369 generic_elf_osabi_sniffer (bfd
*abfd
)
371 unsigned int elfosabi
;
372 enum gdb_osabi osabi
= GDB_OSABI_UNKNOWN
;
374 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
379 /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
380 file are conforming to the base specification for that machine
381 (there are no OS-specific extensions). In order to determine the
382 real OS in use we must look for OS notes that have been added. */
383 bfd_map_over_sections (abfd
,
384 generic_elf_osabi_sniff_abi_tag_sections
,
388 case ELFOSABI_FREEBSD
:
389 osabi
= GDB_OSABI_FREEBSD_ELF
;
392 case ELFOSABI_NETBSD
:
393 osabi
= GDB_OSABI_NETBSD_ELF
;
397 osabi
= GDB_OSABI_LINUX
;
401 osabi
= GDB_OSABI_HURD
;
404 case ELFOSABI_SOLARIS
:
405 osabi
= GDB_OSABI_SOLARIS
;
409 if (osabi
== GDB_OSABI_UNKNOWN
)
411 /* The FreeBSD folks have been naughty; they stored the string
412 "FreeBSD" in the padding of the e_ident field of the ELF
413 header to "brand" their ELF binaries in FreeBSD 3.x. */
414 if (strcmp (&elf_elfheader (abfd
)->e_ident
[8], "FreeBSD") == 0)
415 osabi
= GDB_OSABI_FREEBSD_ELF
;
423 _initialize_gdb_osabi (void)
425 if (strcmp (gdb_osabi_names
[GDB_OSABI_INVALID
], "<invalid>") != 0)
428 "_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent");
430 /* Register a generic sniffer for ELF flavoured files. */
431 gdbarch_register_osabi_sniffer (bfd_arch_unknown
,
432 bfd_target_elf_flavour
,
433 generic_elf_osabi_sniffer
);