459 lines
13 KiB
C
459 lines
13 KiB
C
/* OS ABI variant handling for GDB.
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Copyright 2001, 2002 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "osabi.h"
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#include "elf-bfd.h"
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/* This table matches the indices assigned to enum gdb_osabi. Keep
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them in sync. */
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static const char * const gdb_osabi_names[] =
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{
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"<unknown>",
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"SVR4",
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"GNU/Hurd",
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"Solaris",
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"OSF/1",
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"GNU/Linux",
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"FreeBSD a.out",
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"FreeBSD ELF",
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"NetBSD a.out",
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"NetBSD ELF",
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"Windows CE",
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"DJGPP",
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"NetWare",
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"Irix",
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"LynxOS",
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"Interix",
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"HP/UX ELF",
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"HP/UX SOM",
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"ARM EABI v1",
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"ARM EABI v2",
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"ARM APCS",
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"<invalid>"
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};
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const char *
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gdbarch_osabi_name (enum gdb_osabi osabi)
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{
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if (osabi >= GDB_OSABI_UNKNOWN && osabi < GDB_OSABI_INVALID)
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return gdb_osabi_names[osabi];
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return gdb_osabi_names[GDB_OSABI_INVALID];
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}
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/* Handler for a given architecture/OS ABI pair. There should be only
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one handler for a given OS ABI each architecture family. */
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struct gdb_osabi_handler
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{
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struct gdb_osabi_handler *next;
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const struct bfd_arch_info *arch_info;
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enum gdb_osabi osabi;
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void (*init_osabi)(struct gdbarch_info, struct gdbarch *);
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};
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static struct gdb_osabi_handler *gdb_osabi_handler_list;
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void
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gdbarch_register_osabi (enum bfd_architecture arch, unsigned long machine,
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enum gdb_osabi osabi,
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void (*init_osabi)(struct gdbarch_info,
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struct gdbarch *))
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{
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struct gdb_osabi_handler **handler_p;
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const struct bfd_arch_info *arch_info = bfd_lookup_arch (arch, machine);
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/* Registering an OS ABI handler for "unknown" is not allowed. */
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if (osabi == GDB_OSABI_UNKNOWN)
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{
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internal_error
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(__FILE__, __LINE__,
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"gdbarch_register_osabi: An attempt to register a handler for "
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"OS ABI \"%s\" for architecture %s was made. The handler will "
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"not be registered",
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gdbarch_osabi_name (osabi),
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bfd_printable_arch_mach (arch, machine));
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return;
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}
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gdb_assert (arch_info);
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for (handler_p = &gdb_osabi_handler_list; *handler_p != NULL;
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handler_p = &(*handler_p)->next)
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{
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if ((*handler_p)->arch_info == arch_info
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&& (*handler_p)->osabi == osabi)
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{
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internal_error
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(__FILE__, __LINE__,
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"gdbarch_register_osabi: A handler for OS ABI \"%s\" "
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"has already been registered for architecture %s",
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gdbarch_osabi_name (osabi),
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arch_info->printable_name);
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/* If user wants to continue, override previous definition. */
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(*handler_p)->init_osabi = init_osabi;
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return;
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}
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}
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(*handler_p)
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= (struct gdb_osabi_handler *) xmalloc (sizeof (struct gdb_osabi_handler));
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(*handler_p)->next = NULL;
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(*handler_p)->arch_info = arch_info;
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(*handler_p)->osabi = osabi;
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(*handler_p)->init_osabi = init_osabi;
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}
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/* Sniffer to find the OS ABI for a given file's architecture and flavour.
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It is legal to have multiple sniffers for each arch/flavour pair, to
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disambiguate one OS's a.out from another, for example. The first sniffer
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to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should
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be careful to claim a file only if it knows for sure what it is. */
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struct gdb_osabi_sniffer
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{
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struct gdb_osabi_sniffer *next;
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enum bfd_architecture arch; /* bfd_arch_unknown == wildcard */
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enum bfd_flavour flavour;
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enum gdb_osabi (*sniffer)(bfd *);
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};
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static struct gdb_osabi_sniffer *gdb_osabi_sniffer_list;
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void
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gdbarch_register_osabi_sniffer (enum bfd_architecture arch,
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enum bfd_flavour flavour,
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enum gdb_osabi (*sniffer_fn)(bfd *))
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{
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struct gdb_osabi_sniffer *sniffer;
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sniffer =
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(struct gdb_osabi_sniffer *) xmalloc (sizeof (struct gdb_osabi_sniffer));
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sniffer->arch = arch;
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sniffer->flavour = flavour;
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sniffer->sniffer = sniffer_fn;
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sniffer->next = gdb_osabi_sniffer_list;
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gdb_osabi_sniffer_list = sniffer;
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}
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enum gdb_osabi
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gdbarch_lookup_osabi (bfd *abfd)
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{
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struct gdb_osabi_sniffer *sniffer;
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enum gdb_osabi osabi, match;
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int match_specific;
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match = GDB_OSABI_UNKNOWN;
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match_specific = 0;
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for (sniffer = gdb_osabi_sniffer_list; sniffer != NULL;
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sniffer = sniffer->next)
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{
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if ((sniffer->arch == bfd_arch_unknown /* wildcard */
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|| sniffer->arch == bfd_get_arch (abfd))
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&& sniffer->flavour == bfd_get_flavour (abfd))
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{
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osabi = (*sniffer->sniffer) (abfd);
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if (osabi < GDB_OSABI_UNKNOWN || osabi >= GDB_OSABI_INVALID)
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{
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internal_error
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(__FILE__, __LINE__,
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"gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer "
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"for architecture %s flavour %d",
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(int) osabi,
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bfd_printable_arch_mach (bfd_get_arch (abfd), 0),
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(int) bfd_get_flavour (abfd));
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}
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else if (osabi != GDB_OSABI_UNKNOWN)
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{
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/* A specific sniffer always overrides a generic sniffer.
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Croak on multiple match if the two matches are of the
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same class. If the user wishes to continue, we'll use
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the first match. */
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if (match != GDB_OSABI_UNKNOWN)
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{
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if ((match_specific && sniffer->arch != bfd_arch_unknown)
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|| (!match_specific && sniffer->arch == bfd_arch_unknown))
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{
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internal_error
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(__FILE__, __LINE__,
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"gdbarch_lookup_osabi: multiple %sspecific OS ABI "
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"match for architecture %s flavour %d: first "
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"match \"%s\", second match \"%s\"",
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match_specific ? "" : "non-",
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bfd_printable_arch_mach (bfd_get_arch (abfd), 0),
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(int) bfd_get_flavour (abfd),
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gdbarch_osabi_name (match),
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gdbarch_osabi_name (osabi));
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}
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else if (sniffer->arch != bfd_arch_unknown)
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{
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match = osabi;
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match_specific = 1;
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}
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}
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else
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{
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match = osabi;
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if (sniffer->arch != bfd_arch_unknown)
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match_specific = 1;
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}
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}
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}
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}
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return match;
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}
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void
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gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch,
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enum gdb_osabi osabi)
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{
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const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (gdbarch);
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const struct bfd_arch_info *compatible;
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struct gdb_osabi_handler *handler;
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if (osabi == GDB_OSABI_UNKNOWN)
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{
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/* Don't complain about an unknown OSABI. Assume the user knows
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what they are doing. */
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return;
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}
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for (handler = gdb_osabi_handler_list; handler != NULL;
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handler = handler->next)
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{
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if (handler->osabi != osabi)
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continue;
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/* Check whether the machine type and architecture of the
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handler are compatible with the desired machine type and
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architecture.
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NOTE: kettenis/20021027: There may be more than one machine
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type that is compatible with the desired machine type. Right
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now we simply return the first match, which is fine for now.
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However, we might want to do something smarter in the future. */
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compatible = arch_info->compatible (arch_info, handler->arch_info);
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if (compatible == handler->arch_info)
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{
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(*handler->init_osabi) (info, gdbarch);
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return;
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}
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}
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/* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM
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that an ABI variant can be supported by overriding definitions in
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the tm-file. */
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if (GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL)
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fprintf_filtered
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(gdb_stderr,
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"A handler for the OS ABI \"%s\" is not built into this "
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"configuration of GDB. "
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"Attempting to continue with the default %s settings",
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gdbarch_osabi_name (osabi),
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bfd_printable_arch_mach (arch_info->arch, arch_info->mach));
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}
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/* Generic sniffer for ELF flavoured files. */
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void
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generic_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, void *obj)
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{
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enum gdb_osabi *os_ident_ptr = obj;
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const char *name;
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unsigned int sectsize;
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name = bfd_get_section_name (abfd, sect);
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sectsize = bfd_section_size (abfd, sect);
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/* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */
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if (strcmp (name, ".note.ABI-tag") == 0 && sectsize > 0)
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{
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unsigned int name_length, data_length, note_type;
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char *note;
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/* If the section is larger than this, it's probably not what we are
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looking for. */
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if (sectsize > 128)
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sectsize = 128;
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note = alloca (sectsize);
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bfd_get_section_contents (abfd, sect, note,
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(file_ptr) 0, (bfd_size_type) sectsize);
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name_length = bfd_h_get_32 (abfd, note);
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data_length = bfd_h_get_32 (abfd, note + 4);
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note_type = bfd_h_get_32 (abfd, note + 8);
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if (name_length == 4 && data_length == 16 && note_type == NT_GNU_ABI_TAG
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&& strcmp (note + 12, "GNU") == 0)
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{
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int os_number = bfd_h_get_32 (abfd, note + 16);
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switch (os_number)
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{
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case GNU_ABI_TAG_LINUX:
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*os_ident_ptr = GDB_OSABI_LINUX;
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break;
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case GNU_ABI_TAG_HURD:
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*os_ident_ptr = GDB_OSABI_HURD;
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break;
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case GNU_ABI_TAG_SOLARIS:
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*os_ident_ptr = GDB_OSABI_SOLARIS;
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break;
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default:
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internal_error
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(__FILE__, __LINE__,
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"generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d",
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os_number);
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}
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return;
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}
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else if (name_length == 8 && data_length == 4
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&& note_type == NT_FREEBSD_ABI_TAG
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&& strcmp (note + 12, "FreeBSD") == 0)
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{
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/* XXX Should we check the version here? Probably not
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necessary yet. */
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*os_ident_ptr = GDB_OSABI_FREEBSD_ELF;
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}
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return;
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}
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/* .note.netbsd.ident notes, used by NetBSD. */
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if (strcmp (name, ".note.netbsd.ident") == 0 && sectsize > 0)
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{
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unsigned int name_length, data_length, note_type;
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char *note;
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/* If the section is larger than this, it's probably not what we are
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looking for. */
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if (sectsize > 128)
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sectsize = 128;
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note = alloca (sectsize);
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bfd_get_section_contents (abfd, sect, note,
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(file_ptr) 0, (bfd_size_type) sectsize);
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name_length = bfd_h_get_32 (abfd, note);
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data_length = bfd_h_get_32 (abfd, note + 4);
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note_type = bfd_h_get_32 (abfd, note + 8);
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if (name_length == 7 && data_length == 4 && note_type == NT_NETBSD_IDENT
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&& strcmp (note + 12, "NetBSD") == 0)
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{
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/* XXX Should we check the version here? Probably not
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necessary yet. */
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*os_ident_ptr = GDB_OSABI_NETBSD_ELF;
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}
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return;
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}
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}
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static enum gdb_osabi
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generic_elf_osabi_sniffer (bfd *abfd)
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{
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unsigned int elfosabi;
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enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
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elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
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switch (elfosabi)
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{
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case ELFOSABI_NONE:
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/* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
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file are conforming to the base specification for that machine
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(there are no OS-specific extensions). In order to determine the
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real OS in use we must look for OS notes that have been added. */
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bfd_map_over_sections (abfd,
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generic_elf_osabi_sniff_abi_tag_sections,
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&osabi);
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break;
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case ELFOSABI_FREEBSD:
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osabi = GDB_OSABI_FREEBSD_ELF;
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break;
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case ELFOSABI_NETBSD:
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osabi = GDB_OSABI_NETBSD_ELF;
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break;
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case ELFOSABI_LINUX:
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osabi = GDB_OSABI_LINUX;
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break;
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case ELFOSABI_HURD:
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osabi = GDB_OSABI_HURD;
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break;
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case ELFOSABI_SOLARIS:
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osabi = GDB_OSABI_SOLARIS;
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break;
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case ELFOSABI_HPUX:
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osabi = GDB_OSABI_HPUX_ELF;
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break;
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}
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if (osabi == GDB_OSABI_UNKNOWN)
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{
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/* The FreeBSD folks have been naughty; they stored the string
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"FreeBSD" in the padding of the e_ident field of the ELF
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header to "brand" their ELF binaries in FreeBSD 3.x. */
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if (strcmp (&elf_elfheader (abfd)->e_ident[8], "FreeBSD") == 0)
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osabi = GDB_OSABI_FREEBSD_ELF;
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}
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return osabi;
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}
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void
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_initialize_gdb_osabi (void)
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{
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if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID], "<invalid>") != 0)
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internal_error
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(__FILE__, __LINE__,
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"_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent");
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/* Register a generic sniffer for ELF flavoured files. */
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gdbarch_register_osabi_sniffer (bfd_arch_unknown,
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bfd_target_elf_flavour,
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generic_elf_osabi_sniffer);
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}
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