406 lines
11 KiB
C
406 lines
11 KiB
C
/* Semi-dynamic architecture support for GDB, the GNU debugger.
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Copyright 1998-1999, 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, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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/* Just include everything in sight so that the every old definition
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of macro is visible. */
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#include "gdb_string.h"
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#include <ctype.h>
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#include "symtab.h"
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#include "frame.h"
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#include "inferior.h"
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#include "breakpoint.h"
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#include "wait.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "gdbthread.h"
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#include "annotate.h"
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#include "symfile.h" /* for overlay functions */
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#include "symcat.h"
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/* Non-zero if we want to trace architecture code. */
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#ifndef GDBARCH_DEBUG
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#define GDBARCH_DEBUG 0
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#endif
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int gdbarch_debug = GDBARCH_DEBUG;
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/* Functions to manipulate the endianness of the target. */
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#ifdef TARGET_BYTE_ORDER_SELECTABLE
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/* compat - Catch old targets that expect a selectable byte-order to
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default to BIG_ENDIAN */
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#ifndef TARGET_BYTE_ORDER_DEFAULT
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#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
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#endif
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#endif
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#if !TARGET_BYTE_ORDER_SELECTABLE_P
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#ifndef TARGET_BYTE_ORDER_DEFAULT
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/* compat - Catch old non byte-order selectable targets that do not
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define TARGET_BYTE_ORDER_DEFAULT and instead expect
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TARGET_BYTE_ORDER to be used as the default. For targets that
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defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
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below will get a strange compiler warning. */
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#define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
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#endif
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#endif
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#ifndef TARGET_BYTE_ORDER_DEFAULT
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#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
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#endif
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int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
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int target_byte_order_auto = 1;
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/* Chain containing the \"set endian\" commands. */
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static struct cmd_list_element *endianlist = NULL;
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/* Called by ``show endian''. */
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static void show_endian PARAMS ((char *, int));
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static void
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show_endian (args, from_tty)
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char *args;
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int from_tty;
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{
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char *msg =
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(TARGET_BYTE_ORDER_AUTO
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? "The target endianness is set automatically (currently %s endian)\n"
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: "The target is assumed to be %s endian\n");
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printf_unfiltered (msg, (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
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}
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/* Called if the user enters ``set endian'' without an argument. */
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static void set_endian PARAMS ((char *, int));
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static void
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set_endian (args, from_tty)
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char *args;
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int from_tty;
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{
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printf_unfiltered ("\"set endian\" must be followed by \"auto\", \"big\" or \"little\".\n");
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show_endian (args, from_tty);
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}
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/* Called by ``set endian big''. */
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static void set_endian_big PARAMS ((char *, int));
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static void
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set_endian_big (args, from_tty)
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char *args;
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int from_tty;
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{
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if (TARGET_BYTE_ORDER_SELECTABLE_P)
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{
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target_byte_order = BIG_ENDIAN;
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target_byte_order_auto = 0;
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}
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else
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{
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printf_unfiltered ("Byte order is not selectable.");
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show_endian (args, from_tty);
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}
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}
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/* Called by ``set endian little''. */
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static void set_endian_little PARAMS ((char *, int));
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static void
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set_endian_little (args, from_tty)
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char *args;
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int from_tty;
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{
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if (TARGET_BYTE_ORDER_SELECTABLE_P)
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{
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target_byte_order = LITTLE_ENDIAN;
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target_byte_order_auto = 0;
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}
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else
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{
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printf_unfiltered ("Byte order is not selectable.");
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show_endian (args, from_tty);
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}
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}
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/* Called by ``set endian auto''. */
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static void set_endian_auto PARAMS ((char *, int));
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static void
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set_endian_auto (args, from_tty)
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char *args;
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int from_tty;
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{
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if (TARGET_BYTE_ORDER_SELECTABLE_P)
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{
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target_byte_order_auto = 1;
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}
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else
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{
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printf_unfiltered ("Byte order is not selectable.");
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show_endian (args, from_tty);
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}
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}
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/* Set the endianness from a BFD. */
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static void set_endian_from_file PARAMS ((bfd *));
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static void
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set_endian_from_file (abfd)
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bfd *abfd;
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{
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if (TARGET_BYTE_ORDER_SELECTABLE_P)
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{
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int want;
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if (bfd_big_endian (abfd))
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want = BIG_ENDIAN;
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else
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want = LITTLE_ENDIAN;
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if (TARGET_BYTE_ORDER_AUTO)
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target_byte_order = want;
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else if (TARGET_BYTE_ORDER != want)
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warning ("%s endian file does not match %s endian target.",
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want == BIG_ENDIAN ? "big" : "little",
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TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
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}
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else
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{
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if (bfd_big_endian (abfd)
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? TARGET_BYTE_ORDER != BIG_ENDIAN
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: TARGET_BYTE_ORDER == BIG_ENDIAN)
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warning ("%s endian file does not match %s endian target.",
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bfd_big_endian (abfd) ? "big" : "little",
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TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
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}
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}
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/* Functions to manipulate the architecture of the target */
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int target_architecture_auto = 1;
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extern const struct bfd_arch_info bfd_default_arch_struct;
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const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
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int (*target_architecture_hook) PARAMS ((const struct bfd_arch_info *ap));
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/* Do the real work of changing the current architecture */
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static int arch_valid PARAMS ((const struct bfd_arch_info *arch));
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static int
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arch_ok (arch)
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const struct bfd_arch_info *arch;
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{
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/* Should be performing the more basic check that the binary is
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compatible with GDB. */
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/* Check with the target that the architecture is valid. */
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return (target_architecture_hook == NULL
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|| target_architecture_hook (arch));
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}
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enum set_arch { set_arch_auto, set_arch_manual };
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static void
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set_arch (arch, type)
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const struct bfd_arch_info *arch;
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enum set_arch type;
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{
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switch (type)
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{
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case set_arch_auto:
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if (!arch_ok (arch))
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warning ("Target may not support %s architecture",
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arch->printable_name);
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target_architecture = arch;
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break;
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case set_arch_manual:
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if (!arch_ok (arch))
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{
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printf_unfiltered ("Target does not support `%s' architecture.\n",
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arch->printable_name);
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}
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else
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{
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target_architecture_auto = 0;
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target_architecture = arch;
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}
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break;
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}
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}
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/* Called if the user enters ``show architecture'' without an argument. */
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static void show_architecture PARAMS ((char *, int));
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static void
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show_architecture (args, from_tty)
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char *args;
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int from_tty;
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{
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const char *arch;
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arch = TARGET_ARCHITECTURE->printable_name;
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if (target_architecture_auto)
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printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
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else
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printf_filtered ("The target architecture is assumed to be %s\n", arch);
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}
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/* Called if the user enters ``set architecture'' with or without an
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argument. */
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static void set_architecture PARAMS ((char *, int));
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static void
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set_architecture (args, from_tty)
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char *args;
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int from_tty;
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{
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if (args == NULL)
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{
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printf_unfiltered ("\"set architecture\" must be followed by \"auto\" or an architecture name.\n");
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}
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else if (strcmp (args, "auto") == 0)
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{
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target_architecture_auto = 1;
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}
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else
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{
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const struct bfd_arch_info *arch = bfd_scan_arch (args);
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if (arch != NULL)
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set_arch (arch, set_arch_manual);
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else
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printf_unfiltered ("Architecture `%s' not reconized.\n", args);
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}
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}
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/* Called if the user enters ``info architecture'' without an argument. */
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static void info_architecture PARAMS ((char *, int));
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static void
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info_architecture (args, from_tty)
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char *args;
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int from_tty;
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{
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enum bfd_architecture a;
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printf_filtered ("Available architectures are:\n");
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for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
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{
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const struct bfd_arch_info *ap = bfd_lookup_arch (a, 0);
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if (ap != NULL)
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{
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do
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{
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printf_filtered (" %s", ap->printable_name);
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ap = ap->next;
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}
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while (ap != NULL);
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printf_filtered ("\n");
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}
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}
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}
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/* Set the architecture from arch/machine */
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void
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set_architecture_from_arch_mach (arch, mach)
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enum bfd_architecture arch;
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unsigned long mach;
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{
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const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
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if (wanted != NULL)
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set_arch (wanted, set_arch_manual);
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else
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fatal ("hardwired architecture/machine not reconized");
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}
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/* Set the architecture from a BFD */
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static void set_architecture_from_file PARAMS ((bfd *));
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static void
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set_architecture_from_file (abfd)
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bfd *abfd;
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{
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const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
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if (target_architecture_auto)
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{
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set_arch (wanted, set_arch_auto);
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}
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else if (wanted != target_architecture)
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{
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warning ("%s architecture file may be incompatible with %s target.",
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wanted->printable_name,
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target_architecture->printable_name);
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}
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}
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/* Disassembler */
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/* Pointer to the target-dependent disassembly function. */
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int (*tm_print_insn) PARAMS ((bfd_vma, disassemble_info *));
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disassemble_info tm_print_insn_info;
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/* Set the dynamic target-system-dependant parameters (architecture,
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byte-order) using information found in the BFD */
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void
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set_gdbarch_from_file (abfd)
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bfd *abfd;
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{
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set_architecture_from_file (abfd);
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set_endian_from_file (abfd);
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}
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#if defined (CALL_DUMMY)
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/* FIXME - this should go away */
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LONGEST call_dummy_words[] = CALL_DUMMY;
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int sizeof_call_dummy_words = sizeof (call_dummy_words);
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#endif
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extern void _initialize_gdbarch PARAMS ((void));
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void
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_initialize_gdbarch ()
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{
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add_prefix_cmd ("endian", class_support, set_endian,
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"Set endianness of target.",
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&endianlist, "set endian ", 0, &setlist);
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add_cmd ("big", class_support, set_endian_big,
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"Set target as being big endian.", &endianlist);
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add_cmd ("little", class_support, set_endian_little,
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"Set target as being little endian.", &endianlist);
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add_cmd ("auto", class_support, set_endian_auto,
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"Select target endianness automatically.", &endianlist);
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add_cmd ("endian", class_support, show_endian,
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"Show endianness of target.", &showlist);
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add_cmd ("architecture", class_support, set_architecture,
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"Set architecture of target.", &setlist);
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add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
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add_cmd ("architecture", class_support, show_architecture,
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"Show architecture of target.", &showlist);
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add_cmd ("architecture", class_support, info_architecture,
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"List supported target architectures", &infolist);
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INIT_DISASSEMBLE_INFO_NO_ARCH (tm_print_insn_info, gdb_stdout, (fprintf_ftype)fprintf_filtered);
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tm_print_insn_info.flavour = bfd_target_unknown_flavour;
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tm_print_insn_info.read_memory_func = dis_asm_read_memory;
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tm_print_insn_info.memory_error_func = dis_asm_memory_error;
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tm_print_insn_info.print_address_func = dis_asm_print_address;
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add_show_from_set (add_set_cmd ("archdebug",
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class_maintenance,
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var_zinteger,
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(char *)&gdbarch_debug,
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"Set architecture debugging.\n\
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When non-zero, architecture debugging is enabled.", &setlist),
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&showlist);
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}
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