678 lines
19 KiB
C
678 lines
19 KiB
C
/* OS ABI variant handling for GDB.
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Copyright (C) 2001-2020 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "osabi.h"
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#include "arch-utils.h"
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#include "gdbcmd.h"
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#include "command.h"
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#include "elf-bfd.h"
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#ifndef GDB_OSABI_DEFAULT
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#define GDB_OSABI_DEFAULT GDB_OSABI_UNKNOWN
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#endif
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/* State for the "set osabi" command. */
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static enum { osabi_auto, osabi_default, osabi_user } user_osabi_state;
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static enum gdb_osabi user_selected_osabi;
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static const char *gdb_osabi_available_names[GDB_OSABI_INVALID + 3] = {
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"auto",
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"default",
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"none",
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NULL
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};
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static const char *set_osabi_string;
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/* Names associated with each osabi. */
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struct osabi_names
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{
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/* The "pretty" name. */
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const char *pretty;
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/* The triplet regexp, or NULL if not known. */
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const char *regexp;
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};
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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 struct osabi_names gdb_osabi_names[] =
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{
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{ "unknown", NULL },
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{ "none", NULL },
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{ "SVR4", NULL },
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{ "GNU/Hurd", NULL },
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{ "Solaris", NULL },
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{ "GNU/Linux", "linux(-gnu[^-]*)?" },
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{ "FreeBSD", NULL },
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{ "NetBSD", NULL },
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{ "OpenBSD", NULL },
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{ "WindowsCE", NULL },
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{ "DJGPP", NULL },
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{ "QNX-Neutrino", NULL },
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{ "Cygwin", NULL },
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{ "AIX", NULL },
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{ "DICOS", NULL },
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{ "Darwin", NULL },
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{ "Symbian", NULL },
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{ "OpenVMS", NULL },
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{ "LynxOS178", NULL },
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{ "Newlib", NULL },
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{ "SDE", NULL },
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{ "PikeOS", NULL },
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{ "<invalid>", NULL }
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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].pretty;
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return gdb_osabi_names[GDB_OSABI_INVALID].pretty;
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}
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/* See osabi.h. */
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const char *
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osabi_triplet_regexp (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].regexp;
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return gdb_osabi_names[GDB_OSABI_INVALID].regexp;
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}
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/* Lookup the OS ABI corresponding to the specified target description
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string. */
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enum gdb_osabi
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osabi_from_tdesc_string (const char *name)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE (gdb_osabi_names); i++)
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if (strcmp (name, gdb_osabi_names[i].pretty) == 0)
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{
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/* See note above: the name table matches the indices assigned
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to enum gdb_osabi. */
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enum gdb_osabi osabi = (enum gdb_osabi) i;
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if (osabi == GDB_OSABI_INVALID)
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return GDB_OSABI_UNKNOWN;
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else
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return osabi;
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}
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return GDB_OSABI_UNKNOWN;
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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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const char **name_ptr;
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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) = XNEW (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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/* Add this OS ABI to the list of enum values for "set osabi", if it isn't
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already there. */
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for (name_ptr = gdb_osabi_available_names; *name_ptr; name_ptr ++)
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{
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if (*name_ptr == gdbarch_osabi_name (osabi))
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return;
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}
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*name_ptr++ = gdbarch_osabi_name (osabi);
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*name_ptr = NULL;
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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 = XNEW (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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/* If we aren't in "auto" mode, return the specified OS ABI. */
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if (user_osabi_state == osabi_user)
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return user_selected_osabi;
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/* If we don't have a binary, just return unknown. The caller may
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have other sources the OSABI can be extracted from, e.g., the
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target description. */
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if (abfd == NULL)
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return GDB_OSABI_UNKNOWN;
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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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/* Return non-zero if architecture A can run code written for
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architecture B. */
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static int
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can_run_code_for (const struct bfd_arch_info *a, const struct bfd_arch_info *b)
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{
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/* BFD's 'A->compatible (A, B)' functions return zero if A and B are
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incompatible. But if they are compatible, it returns the 'more
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featureful' of the two arches. That is, if A can run code
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written for B, but B can't run code written for A, then it'll
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return A.
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struct bfd_arch_info objects are singletons: that is, there's
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supposed to be exactly one instance for a given machine. So you
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can tell whether two are equivalent by comparing pointers. */
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return (a == b || a->compatible (a, b) == a);
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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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{
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struct gdb_osabi_handler *handler;
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gdb_assert (info.osabi != GDB_OSABI_UNKNOWN);
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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 != info.osabi)
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continue;
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/* If the architecture described by ARCH_INFO can run code for
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the architecture we registered the handler for, then the
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handler is applicable. Note, though, that if the handler is
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for an architecture that is a superset of ARCH_INFO, we can't
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use that --- it would be perfectly correct for it to install
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gdbarch methods that refer to registers / instructions /
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other facilities ARCH_INFO doesn't have.
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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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/* NOTE: cagney/2003-10-23: The code for "a can_run_code_for b"
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is implemented using BFD's compatible method (a->compatible
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(b) == a -- the lowest common denominator between a and b is
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a). That method's definition of compatible may not be as you
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expect. For instance the test "amd64 can run code for i386"
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(or more generally "64-bit ISA can run code for the 32-bit
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ISA"). BFD doesn't normally consider 32-bit and 64-bit
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"compatible" so it doesn't succeed. */
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if (can_run_code_for (info.bfd_arch_info, 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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if (info.osabi == GDB_OSABI_NONE)
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{
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/* Don't complain about no 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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warning
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("A handler for the OS ABI \"%s\" is not built into this configuration\n"
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"of GDB. Attempting to continue with the default %s settings.\n",
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gdbarch_osabi_name (info.osabi),
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info.bfd_arch_info->printable_name);
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}
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/* Limit on the amount of data to be read. */
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#define MAX_NOTESZ 128
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/* Return non-zero if NOTE matches NAME, DESCSZ and TYPE. If
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*SECTSIZE is non-zero, then this reads that many bytes from
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the start of the section and clears *SECTSIZE. */
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static int
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check_note (bfd *abfd, asection *sect, char *note, unsigned int *sectsize,
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const char *name, unsigned long descsz, unsigned long type)
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{
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unsigned long notesz;
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if (*sectsize)
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{
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if (!bfd_get_section_contents (abfd, sect, note, 0, *sectsize))
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return 0;
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*sectsize = 0;
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}
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/* Calculate the size of this note. */
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notesz = strlen (name) + 1;
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notesz = ((notesz + 3) & ~3);
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notesz += descsz;
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notesz = ((notesz + 3) & ~3);
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/* If this assertion triggers, increase MAX_NOTESZ. */
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gdb_assert (notesz <= MAX_NOTESZ);
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/* Check whether SECT is big enough to contain the complete note. */
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if (notesz > bfd_section_size (sect))
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return 0;
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/* Check the note name. */
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if (bfd_h_get_32 (abfd, note) != (strlen (name) + 1)
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|| strcmp (note + 12, name) != 0)
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return 0;
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/* Check the descriptor size. */
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if (bfd_h_get_32 (abfd, note + 4) != descsz)
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return 0;
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/* Check the note type. */
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if (bfd_h_get_32 (abfd, note + 8) != type)
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return 0;
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return 1;
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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 *osabi = (enum gdb_osabi *) obj;
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const char *name;
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unsigned int sectsize;
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char *note;
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name = bfd_section_name (sect);
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sectsize = bfd_section_size (sect);
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/* Limit the amount of data to read. */
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if (sectsize > MAX_NOTESZ)
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sectsize = MAX_NOTESZ;
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/* We lazily read the section data here. Since we use
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BFD_DECOMPRESS, we can't use bfd_get_section_contents on a
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compressed section. But, since note sections are not compressed,
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deferring the reading until we recognize the section avoids any
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error. */
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note = (char *) alloca (sectsize);
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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)
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{
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/* GNU. */
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if (check_note (abfd, sect, note, §size, "GNU", 16, NT_GNU_ABI_TAG))
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{
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unsigned int abi_tag = bfd_h_get_32 (abfd, note + 16);
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switch (abi_tag)
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{
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case GNU_ABI_TAG_LINUX:
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*osabi = GDB_OSABI_LINUX;
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break;
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case GNU_ABI_TAG_HURD:
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*osabi = GDB_OSABI_HURD;
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break;
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case GNU_ABI_TAG_SOLARIS:
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*osabi = GDB_OSABI_SOLARIS;
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break;
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case GNU_ABI_TAG_FREEBSD:
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*osabi = GDB_OSABI_FREEBSD;
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break;
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case GNU_ABI_TAG_NETBSD:
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*osabi = GDB_OSABI_NETBSD;
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break;
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default:
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warning (_("GNU ABI tag value %u unrecognized."), abi_tag);
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break;
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}
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return;
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}
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/* FreeBSD. */
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if (check_note (abfd, sect, note, §size, "FreeBSD", 4,
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NT_FREEBSD_ABI_TAG))
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{
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/* There is no need to check the version yet. */
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*osabi = GDB_OSABI_FREEBSD;
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return;
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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
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&& check_note (abfd, sect, note, §size, "NetBSD", 4, NT_NETBSD_IDENT))
|
||
{
|
||
/* There is no need to check the version yet. */
|
||
*osabi = GDB_OSABI_NETBSD;
|
||
return;
|
||
}
|
||
|
||
/* .note.openbsd.ident notes, used by OpenBSD. */
|
||
if (strcmp (name, ".note.openbsd.ident") == 0
|
||
&& check_note (abfd, sect, note, §size, "OpenBSD", 4,
|
||
NT_OPENBSD_IDENT))
|
||
{
|
||
/* There is no need to check the version yet. */
|
||
*osabi = GDB_OSABI_OPENBSD;
|
||
return;
|
||
}
|
||
|
||
/* .note.netbsdcore.procinfo notes, used by NetBSD. */
|
||
if (strcmp (name, ".note.netbsdcore.procinfo") == 0)
|
||
{
|
||
*osabi = GDB_OSABI_NETBSD;
|
||
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:
|
||
case ELFOSABI_GNU:
|
||
case ELFOSABI_HPUX:
|
||
/* When the EI_OSABI field in the ELF header 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-specific notes.
|
||
|
||
The same applies for ELFOSABI_GNU: this can mean GNU/Hurd,
|
||
GNU/Linux, and possibly more. */
|
||
|
||
/* And likewise ELFOSABI_HPUX. For some reason the default
|
||
value for the EI_OSABI field is ELFOSABI_HPUX for all PA-RISC
|
||
targets (with the exception of GNU/Linux). */
|
||
bfd_map_over_sections (abfd,
|
||
generic_elf_osabi_sniff_abi_tag_sections,
|
||
&osabi);
|
||
break;
|
||
|
||
case ELFOSABI_FREEBSD:
|
||
osabi = GDB_OSABI_FREEBSD;
|
||
break;
|
||
|
||
case ELFOSABI_NETBSD:
|
||
osabi = GDB_OSABI_NETBSD;
|
||
break;
|
||
|
||
case ELFOSABI_SOLARIS:
|
||
osabi = GDB_OSABI_SOLARIS;
|
||
break;
|
||
|
||
case ELFOSABI_OPENVMS:
|
||
osabi = GDB_OSABI_OPENVMS;
|
||
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 (memcmp (&elf_elfheader (abfd)->e_ident[8],
|
||
"FreeBSD", sizeof ("FreeBSD")) == 0)
|
||
osabi = GDB_OSABI_FREEBSD;
|
||
}
|
||
|
||
return osabi;
|
||
}
|
||
|
||
static void
|
||
set_osabi (const char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
struct gdbarch_info info;
|
||
|
||
if (strcmp (set_osabi_string, "auto") == 0)
|
||
user_osabi_state = osabi_auto;
|
||
else if (strcmp (set_osabi_string, "default") == 0)
|
||
{
|
||
user_selected_osabi = GDB_OSABI_DEFAULT;
|
||
user_osabi_state = osabi_user;
|
||
}
|
||
else
|
||
{
|
||
int i;
|
||
|
||
for (i = 1; i < GDB_OSABI_INVALID; i++)
|
||
{
|
||
enum gdb_osabi osabi = (enum gdb_osabi) i;
|
||
|
||
if (strcmp (set_osabi_string, gdbarch_osabi_name (osabi)) == 0)
|
||
{
|
||
user_selected_osabi = osabi;
|
||
user_osabi_state = osabi_user;
|
||
break;
|
||
}
|
||
}
|
||
if (i == GDB_OSABI_INVALID)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("Invalid OS ABI \"%s\" passed to command handler."),
|
||
set_osabi_string);
|
||
}
|
||
|
||
/* NOTE: At some point (true multiple architectures) we'll need to be more
|
||
graceful here. */
|
||
gdbarch_info_init (&info);
|
||
if (! gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__, _("Updating OS ABI failed."));
|
||
}
|
||
|
||
static void
|
||
show_osabi (struct ui_file *file, int from_tty, struct cmd_list_element *c,
|
||
const char *value)
|
||
{
|
||
if (user_osabi_state == osabi_auto)
|
||
fprintf_filtered (file,
|
||
_("The current OS ABI is \"auto\" "
|
||
"(currently \"%s\").\n"),
|
||
gdbarch_osabi_name (gdbarch_osabi (get_current_arch ())));
|
||
else
|
||
fprintf_filtered (file, _("The current OS ABI is \"%s\".\n"),
|
||
gdbarch_osabi_name (user_selected_osabi));
|
||
|
||
if (GDB_OSABI_DEFAULT != GDB_OSABI_UNKNOWN)
|
||
fprintf_filtered (file, _("The default OS ABI is \"%s\".\n"),
|
||
gdbarch_osabi_name (GDB_OSABI_DEFAULT));
|
||
}
|
||
|
||
void
|
||
_initialize_gdb_osabi (void)
|
||
{
|
||
if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID].pretty, "<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);
|
||
|
||
/* Register the "set osabi" command. */
|
||
add_setshow_enum_cmd ("osabi", class_support, gdb_osabi_available_names,
|
||
&set_osabi_string,
|
||
_("Set OS ABI of target."),
|
||
_("Show OS ABI of target."),
|
||
NULL, set_osabi, show_osabi,
|
||
&setlist, &showlist);
|
||
user_osabi_state = osabi_auto;
|
||
}
|