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);