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[/] [or1k/] [trunk/] [gdb-5.3/] [gdb/] [osabi.c] - Rev 1773
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/* OS ABI variant handling for GDB. Copyright 2001, 2002 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "gdb_string.h" #include "osabi.h" #include "elf-bfd.h" /* This table matches the indices assigned to enum gdb_osabi. Keep them in sync. */ static const char * const gdb_osabi_names[] = { "<unknown>", "SVR4", "GNU/Hurd", "Solaris", "OSF/1", "GNU/Linux", "FreeBSD a.out", "FreeBSD ELF", "NetBSD a.out", "NetBSD ELF", "Windows CE", "DJGPP", "NetWare", "Irix", "LynxOS", "ARM EABI v1", "ARM EABI v2", "ARM APCS", "<invalid>" }; const char * gdbarch_osabi_name (enum gdb_osabi osabi) { if (osabi >= GDB_OSABI_UNKNOWN && osabi < GDB_OSABI_INVALID) return gdb_osabi_names[osabi]; return gdb_osabi_names[GDB_OSABI_INVALID]; } /* Handler for a given architecture/OS ABI pair. There should be only one handler for a given OS ABI each architecture family. */ struct gdb_osabi_handler { struct gdb_osabi_handler *next; enum bfd_architecture arch; enum gdb_osabi osabi; void (*init_osabi)(struct gdbarch_info, struct gdbarch *); }; static struct gdb_osabi_handler *gdb_osabi_handler_list; void gdbarch_register_osabi (enum bfd_architecture arch, enum gdb_osabi osabi, void (*init_osabi)(struct gdbarch_info, struct gdbarch *)) { struct gdb_osabi_handler **handler_p; /* Registering an OS ABI handler for "unknown" is not allowed. */ if (osabi == GDB_OSABI_UNKNOWN) { internal_error (__FILE__, __LINE__, "gdbarch_register_osabi: An attempt to register a handler for " "OS ABI \"%s\" for architecture %s was made. The handler will " "not be registered", gdbarch_osabi_name (osabi), bfd_printable_arch_mach (arch, 0)); return; } for (handler_p = &gdb_osabi_handler_list; *handler_p != NULL; handler_p = &(*handler_p)->next) { if ((*handler_p)->arch == arch && (*handler_p)->osabi == osabi) { internal_error (__FILE__, __LINE__, "gdbarch_register_osabi: A handler for OS ABI \"%s\" " "has already been registered for architecture %s", gdbarch_osabi_name (osabi), bfd_printable_arch_mach (arch, 0)); /* If user wants to continue, override previous definition. */ (*handler_p)->init_osabi = init_osabi; return; } } (*handler_p) = (struct gdb_osabi_handler *) xmalloc (sizeof (struct gdb_osabi_handler)); (*handler_p)->next = NULL; (*handler_p)->arch = arch; (*handler_p)->osabi = osabi; (*handler_p)->init_osabi = init_osabi; } /* Sniffer to find the OS ABI for a given file's architecture and flavour. It is legal to have multiple sniffers for each arch/flavour pair, to disambiguate one OS's a.out from another, for example. The first sniffer to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should be careful to claim a file only if it knows for sure what it is. */ struct gdb_osabi_sniffer { struct gdb_osabi_sniffer *next; enum bfd_architecture arch; /* bfd_arch_unknown == wildcard */ enum bfd_flavour flavour; enum gdb_osabi (*sniffer)(bfd *); }; static struct gdb_osabi_sniffer *gdb_osabi_sniffer_list; void gdbarch_register_osabi_sniffer (enum bfd_architecture arch, enum bfd_flavour flavour, enum gdb_osabi (*sniffer_fn)(bfd *)) { struct gdb_osabi_sniffer *sniffer; sniffer = (struct gdb_osabi_sniffer *) xmalloc (sizeof (struct gdb_osabi_sniffer)); sniffer->arch = arch; sniffer->flavour = flavour; sniffer->sniffer = sniffer_fn; sniffer->next = gdb_osabi_sniffer_list; gdb_osabi_sniffer_list = sniffer; } enum gdb_osabi gdbarch_lookup_osabi (bfd *abfd) { struct gdb_osabi_sniffer *sniffer; enum gdb_osabi osabi, match; int match_specific; match = GDB_OSABI_UNKNOWN; match_specific = 0; for (sniffer = gdb_osabi_sniffer_list; sniffer != NULL; sniffer = sniffer->next) { if ((sniffer->arch == bfd_arch_unknown /* wildcard */ || sniffer->arch == bfd_get_arch (abfd)) && sniffer->flavour == bfd_get_flavour (abfd)) { osabi = (*sniffer->sniffer) (abfd); if (osabi < GDB_OSABI_UNKNOWN || osabi >= GDB_OSABI_INVALID) { internal_error (__FILE__, __LINE__, "gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer " "for architecture %s flavour %d", (int) osabi, bfd_printable_arch_mach (bfd_get_arch (abfd), 0), (int) bfd_get_flavour (abfd)); } else if (osabi != GDB_OSABI_UNKNOWN) { /* A specific sniffer always overrides a generic sniffer. Croak on multiple match if the two matches are of the same class. If the user wishes to continue, we'll use the first match. */ if (match != GDB_OSABI_UNKNOWN) { if ((match_specific && sniffer->arch != bfd_arch_unknown) || (!match_specific && sniffer->arch == bfd_arch_unknown)) { internal_error (__FILE__, __LINE__, "gdbarch_lookup_osabi: multiple %sspecific OS ABI " "match for architecture %s flavour %d: first " "match \"%s\", second match \"%s\"", match_specific ? "" : "non-", bfd_printable_arch_mach (bfd_get_arch (abfd), 0), (int) bfd_get_flavour (abfd), gdbarch_osabi_name (match), gdbarch_osabi_name (osabi)); } else if (sniffer->arch != bfd_arch_unknown) { match = osabi; match_specific = 1; } } else { match = osabi; if (sniffer->arch != bfd_arch_unknown) match_specific = 1; } } } } return match; } void gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch, enum gdb_osabi osabi) { struct gdb_osabi_handler *handler; bfd *abfd = info.abfd; const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (gdbarch); if (osabi == GDB_OSABI_UNKNOWN) { /* Don't complain about an unknown OSABI. Assume the user knows what they are doing. */ return; } for (handler = gdb_osabi_handler_list; handler != NULL; handler = handler->next) { if (handler->arch == bfd_get_arch (abfd) && handler->osabi == osabi) { (*handler->init_osabi) (info, gdbarch); return; } } /* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM that an ABI variant can be supported by overriding definitions in the tm-file. */ if (GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL) fprintf_filtered (gdb_stderr, "A handler for the OS ABI \"%s\" is not built into this " "configuration of GDB. " "Attempting to continue with the default %s settings", gdbarch_osabi_name (osabi), bfd_printable_arch_mach (arch_info->arch, arch_info->mach)); } /* Generic sniffer for ELF flavoured files. */ void generic_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, void *obj) { enum gdb_osabi *os_ident_ptr = obj; const char *name; unsigned int sectsize; name = bfd_get_section_name (abfd, sect); sectsize = bfd_section_size (abfd, sect); /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */ if (strcmp (name, ".note.ABI-tag") == 0 && sectsize > 0) { unsigned int name_length, data_length, note_type; char *note; /* If the section is larger than this, it's probably not what we are looking for. */ if (sectsize > 128) sectsize = 128; note = alloca (sectsize); bfd_get_section_contents (abfd, sect, note, (file_ptr) 0, (bfd_size_type) sectsize); name_length = bfd_h_get_32 (abfd, note); data_length = bfd_h_get_32 (abfd, note + 4); note_type = bfd_h_get_32 (abfd, note + 8); if (name_length == 4 && data_length == 16 && note_type == NT_GNU_ABI_TAG && strcmp (note + 12, "GNU") == 0) { int os_number = bfd_h_get_32 (abfd, note + 16); switch (os_number) { case GNU_ABI_TAG_LINUX: *os_ident_ptr = GDB_OSABI_LINUX; break; case GNU_ABI_TAG_HURD: *os_ident_ptr = GDB_OSABI_HURD; break; case GNU_ABI_TAG_SOLARIS: *os_ident_ptr = GDB_OSABI_SOLARIS; break; default: internal_error (__FILE__, __LINE__, "generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d", os_number); } return; } else if (name_length == 8 && data_length == 4 && note_type == NT_FREEBSD_ABI_TAG && strcmp (note + 12, "FreeBSD") == 0) { /* XXX Should we check the version here? Probably not necessary yet. */ *os_ident_ptr = GDB_OSABI_FREEBSD_ELF; } return; } /* .note.netbsd.ident notes, used by NetBSD. */ if (strcmp (name, ".note.netbsd.ident") == 0 && sectsize > 0) { unsigned int name_length, data_length, note_type; char *note; /* If the section is larger than this, it's probably not what we are looking for. */ if (sectsize > 128) sectsize = 128; note = alloca (sectsize); bfd_get_section_contents (abfd, sect, note, (file_ptr) 0, (bfd_size_type) sectsize); name_length = bfd_h_get_32 (abfd, note); data_length = bfd_h_get_32 (abfd, note + 4); note_type = bfd_h_get_32 (abfd, note + 8); if (name_length == 7 && data_length == 4 && note_type == NT_NETBSD_IDENT && strcmp (note + 12, "NetBSD") == 0) { /* XXX Should we check the version here? Probably not necessary yet. */ *os_ident_ptr = GDB_OSABI_NETBSD_ELF; } return; } } static enum gdb_osabi generic_elf_osabi_sniffer (bfd *abfd) { unsigned int elfosabi; enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; switch (elfosabi) { case ELFOSABI_NONE: /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the file are conforming to the base specification for that machine (there are no OS-specific extensions). In order to determine the real OS in use we must look for OS notes that have been added. */ bfd_map_over_sections (abfd, generic_elf_osabi_sniff_abi_tag_sections, &osabi); break; case ELFOSABI_FREEBSD: osabi = GDB_OSABI_FREEBSD_ELF; break; case ELFOSABI_NETBSD: osabi = GDB_OSABI_NETBSD_ELF; break; case ELFOSABI_LINUX: osabi = GDB_OSABI_LINUX; break; case ELFOSABI_HURD: osabi = GDB_OSABI_HURD; break; case ELFOSABI_SOLARIS: osabi = GDB_OSABI_SOLARIS; break; } if (osabi == GDB_OSABI_UNKNOWN) { /* The FreeBSD folks have been naughty; they stored the string "FreeBSD" in the padding of the e_ident field of the ELF header to "brand" their ELF binaries in FreeBSD 3.x. */ if (strcmp (&elf_elfheader (abfd)->e_ident[8], "FreeBSD") == 0) osabi = GDB_OSABI_FREEBSD_ELF; } return osabi; } void _initialize_gdb_osabi (void) { if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID], "<invalid>") != 0) internal_error (__FILE__, __LINE__, "_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent"); /* Register a generic sniffer for ELF flavoured files. */ gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_elf_flavour, generic_elf_osabi_sniffer); }
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