Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 360 insertions, 0 deletions

diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
new file mode 100644
index 0000000..154fa8f
--- /dev/null
+++ b/gdb/gdbarch.c
@@ -0,0 +1,360 @@
+/* Semi-dynamic architecture support for GDB, the GNU debugger.
+   Copyright 1998, Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "bfd.h"
+#include "gdbcmd.h"
+
+
+
+/* Non-zero if we want to trace architecture code.  */
+
+#ifndef GDBARCH_DEBUG
+#define GDBARCH_DEBUG 0
+#endif
+int gdbarch_debug = GDBARCH_DEBUG;
+
+
+/* Functions to manipulate the endianness of the target.  */
+
+#ifdef TARGET_BYTE_ORDER_SELECTABLE
+/* compat - Catch old targets that expect a selectable byte-order to
+   default to BIG_ENDIAN */
+#ifndef TARGET_BYTE_ORDER_DEFAULT
+#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
+#endif
+#endif
+#ifndef TARGET_BYTE_ORDER_DEFAULT
+/* compat - Catch old non byte-order selectable targets that do not
+   define TARGET_BYTE_ORDER_DEFAULT and instead expect
+   TARGET_BYTE_ORDER to be used as the default.  For targets that
+   defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
+   below will get a strange compiler warning. */
+#define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
+#endif
+int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
+int target_byte_order_auto = 1;
+
+/* Chain containing the \"set endian\" commands.  */
+static struct cmd_list_element *endianlist = NULL;
+
+/* Called by ``show endian''.  */
+static void show_endian PARAMS ((char *, int));
+static void
+show_endian (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  char *msg =
+    (TARGET_BYTE_ORDER_AUTO
+     ? "The target endianness is set automatically (currently %s endian)\n"
+     : "The target is assumed to be %s endian\n");
+  printf_unfiltered (msg, (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
+}
+
+/* Called if the user enters ``set endian'' without an argument.  */
+static void set_endian PARAMS ((char *, int));
+static void
+set_endian (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  printf_unfiltered ("\"set endian\" must be followed by \"auto\", \"big\" or \"little\".\n");
+  show_endian (args, from_tty);
+}
+
+/* Called by ``set endian big''.  */
+static void set_endian_big PARAMS ((char *, int));
+static void
+set_endian_big (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (TARGET_BYTE_ORDER_SELECTABLE_P)
+    {
+      target_byte_order = BIG_ENDIAN;
+      target_byte_order_auto = 0;
+    }
+  else
+    {
+      printf_unfiltered ("Byte order is not selectable.");
+      show_endian (args, from_tty);
+    }
+}
+
+/* Called by ``set endian little''.  */
+static void set_endian_little PARAMS ((char *, int));
+static void
+set_endian_little (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (TARGET_BYTE_ORDER_SELECTABLE_P)
+    {
+      target_byte_order = LITTLE_ENDIAN;
+      target_byte_order_auto = 0;
+    }
+  else
+    {
+      printf_unfiltered ("Byte order is not selectable.");
+      show_endian (args, from_tty);
+    }
+}
+
+/* Called by ``set endian auto''.  */
+static void set_endian_auto PARAMS ((char *, int));
+static void
+set_endian_auto (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (TARGET_BYTE_ORDER_SELECTABLE_P)
+    {
+      target_byte_order_auto = 1;
+    }
+  else
+    {
+      printf_unfiltered ("Byte order is not selectable.");
+      show_endian (args, from_tty);
+    }
+}
+
+/* Set the endianness from a BFD.  */
+static void set_endian_from_file PARAMS ((bfd *));
+static void
+set_endian_from_file (abfd)
+     bfd *abfd;
+{
+  if (TARGET_BYTE_ORDER_SELECTABLE_P)
+    {
+      int want;
+      
+      if (bfd_big_endian (abfd))
+	want = BIG_ENDIAN;
+      else
+	want = LITTLE_ENDIAN;
+      if (TARGET_BYTE_ORDER_AUTO)
+	target_byte_order = want;
+      else if (TARGET_BYTE_ORDER != want)
+	warning ("%s endian file does not match %s endian target.",
+		 want == BIG_ENDIAN ? "big" : "little",
+		 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
+    }
+  else
+    {
+      if (bfd_big_endian (abfd)
+	  ? TARGET_BYTE_ORDER != BIG_ENDIAN
+	  : TARGET_BYTE_ORDER == BIG_ENDIAN)
+	warning ("%s endian file does not match %s endian target.",
+		 bfd_big_endian (abfd) ? "big" : "little",
+		 TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
+    }
+}
+
+
+
+/* Functions to manipulate the architecture of the target */
+
+int target_architecture_auto = 1;
+extern const struct bfd_arch_info bfd_default_arch_struct;
+const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
+int (*target_architecture_hook) PARAMS ((const struct bfd_arch_info *ap));
+
+/* Do the real work of changing the current architecture */
+static void
+set_arch (arch)
+     const struct bfd_arch_info *arch;
+{
+  /* FIXME: Is it compatible with gdb? */
+  /* Check with the target on the setting */
+  if (target_architecture_hook != NULL
+      && !target_architecture_hook (arch))
+    printf_unfiltered ("Target does not support `%s' architecture.\n",
+		       arch->printable_name);
+  else
+    {
+      target_architecture_auto = 0;
+      target_architecture = arch;
+    }
+}
+
+/* Called if the user enters ``show architecture'' without an argument. */
+static void show_architecture PARAMS ((char *, int));
+static void
+show_architecture (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  const char *arch;
+  arch = TARGET_ARCHITECTURE->printable_name;
+  if (target_architecture_auto)
+    printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
+  else
+    printf_filtered ("The target architecture is assumed to be %s\n", arch);
+}
+
+/* Called if the user enters ``set architecture'' with or without an
+   argument. */
+static void set_architecture PARAMS ((char *, int));
+static void
+set_architecture (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (args == NULL)
+    {
+      printf_unfiltered ("\"set architecture\" must be followed by \"auto\" or an architecture name.\n");
+    }
+  else if (strcmp (args, "auto") == 0)
+    {
+      target_architecture_auto = 1;
+    }
+  else
+    {
+      const struct bfd_arch_info *arch = bfd_scan_arch (args);
+      if (arch != NULL)
+	set_arch (arch);
+      else
+	printf_unfiltered ("Architecture `%s' not reconized.\n", args);
+    }
+}
+
+/* Called if the user enters ``info architecture'' without an argument. */
+static void info_architecture PARAMS ((char *, int));
+static void
+info_architecture (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  enum bfd_architecture a;
+  printf_filtered ("Available architectures are:\n");
+  for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
+    {
+      const struct bfd_arch_info *ap = bfd_lookup_arch (a, 0);
+      if (ap != NULL)
+	{
+	  do
+	    {
+	      printf_filtered (" %s", ap->printable_name);
+	      ap = ap->next;
+	    }
+	  while (ap != NULL);
+	  printf_filtered ("\n");
+	}
+    }
+}
+
+/* Set the architecture from arch/machine */
+void
+set_architecture_from_arch_mach (arch, mach)
+     enum bfd_architecture arch;
+     unsigned long mach;
+{
+  const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
+  if (wanted != NULL)
+    set_arch (wanted);
+  else
+    fatal ("hardwired architecture/machine not reconized");
+}
+
+/* Set the architecture from a BFD */
+static void set_architecture_from_file PARAMS ((bfd *));
+static void
+set_architecture_from_file (abfd)
+     bfd *abfd;
+{
+  const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
+  if (target_architecture_auto)
+    {
+      if (target_architecture_hook != NULL
+	  && !target_architecture_hook (wanted))
+	warning ("Target may not support %s architecture",
+		 wanted->printable_name);
+      target_architecture = wanted;
+    }
+  else if (wanted != target_architecture)
+    {
+      warning ("%s architecture file may be incompatible with %s target.",
+	       wanted->printable_name,
+	       target_architecture->printable_name);
+    }
+}
+
+
+
+/* Disassembler */
+
+/* Pointer to the target-dependent disassembly function.  */
+int (*tm_print_insn) PARAMS ((bfd_vma, disassemble_info *));
+disassemble_info tm_print_insn_info;
+
+
+
+/* Set the dynamic target-system-dependant parameters (architecture,
+   byte-order) using information found in the BFD */
+
+void
+set_gdbarch_from_file (abfd)
+     bfd *abfd;
+{
+  set_architecture_from_file (abfd);
+  set_endian_from_file (abfd);
+}
+
+
+extern void _initialize_gdbarch PARAMS ((void));
+void
+_initialize_gdbarch ()
+{
+  add_prefix_cmd ("endian", class_support, set_endian,
+		  "Set endianness of target.",
+		  &endianlist, "set endian ", 0, &setlist);
+  add_cmd ("big", class_support, set_endian_big,
+	   "Set target as being big endian.", &endianlist);
+  add_cmd ("little", class_support, set_endian_little,
+	   "Set target as being little endian.", &endianlist);
+  add_cmd ("auto", class_support, set_endian_auto,
+	   "Select target endianness automatically.", &endianlist);
+  add_cmd ("endian", class_support, show_endian,
+	   "Show endianness of target.", &showlist);
+
+  add_cmd ("architecture", class_support, set_architecture,
+	   "Set architecture of target.", &setlist);
+  add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
+  add_cmd ("architecture", class_support, show_architecture,
+	   "Show architecture of target.", &showlist);
+  add_cmd ("architecture", class_support, info_architecture,
+	   "List supported target architectures", &infolist);
+
+  INIT_DISASSEMBLE_INFO_NO_ARCH (tm_print_insn_info, gdb_stdout, (fprintf_ftype)fprintf_filtered);
+  tm_print_insn_info.flavour = bfd_target_unknown_flavour;
+  tm_print_insn_info.read_memory_func = dis_asm_read_memory;
+  tm_print_insn_info.memory_error_func = dis_asm_memory_error;
+  tm_print_insn_info.print_address_func = dis_asm_print_address;
+
+#ifdef MAINTENANCE_CMDS
+  add_show_from_set (add_set_cmd ("archdebug",
+				  class_maintenance,
+				  var_zinteger,
+				  (char *)&gdbarch_debug,
+				  "Set architecture debugging.\n\
+When non-zero, architecture debugging is enabled.", &setlist),
+		     &showlist);
+#endif
+}