Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 122 insertions, 0 deletions

diff --git a/gdb/ns32k-tdep.c b/gdb/ns32k-tdep.c
new file mode 100644
index 0000000..3edb7f5
--- /dev/null
+++ b/gdb/ns32k-tdep.c
@@ -0,0 +1,122 @@
+/* Print NS 32000 instructions for GDB, the GNU debugger.
+   Copyright 1986, 1988, 1991, 1992, 1994, 1995
+   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"
+
+void
+_initialize_ns32k_tdep ()
+{
+  tm_print_insn = print_insn_ns32k;
+}
+
+sign_extend (value, bits)
+{
+  value = value & ((1 << bits) - 1);
+  return (value & (1 << (bits-1))
+	  ? value | (~((1 << bits) - 1))
+	  : value);
+}
+
+void
+flip_bytes (ptr, count)
+     char *ptr;
+     int count;
+{
+  char tmp;
+
+  while (count > 0)
+    {
+      tmp = *ptr;
+      ptr[0] = ptr[count-1];
+      ptr[count-1] = tmp;
+      ptr++;
+      count -= 2;
+    }
+}
+
+/* Return the number of locals in the current frame given a pc
+   pointing to the enter instruction.  This is used in the macro
+   FRAME_FIND_SAVED_REGS.  */
+
+int
+ns32k_localcount (enter_pc)
+     CORE_ADDR enter_pc;
+{
+  unsigned char localtype;
+  int localcount;
+
+  localtype = read_memory_integer (enter_pc+2, 1);
+  if ((localtype & 0x80) == 0)
+    localcount = localtype;
+  else if ((localtype & 0xc0) == 0x80)
+    localcount = (((localtype & 0x3f) << 8)
+		  | (read_memory_integer (enter_pc+3, 1) & 0xff));
+  else
+    localcount = (((localtype & 0x3f) << 24)
+		  | ((read_memory_integer (enter_pc+3, 1) & 0xff) << 16)
+		  | ((read_memory_integer (enter_pc+4, 1) & 0xff) << 8 )
+		  | (read_memory_integer (enter_pc+5, 1) & 0xff));
+  return localcount;
+}
+
+
+/* Nonzero if instruction at PC is a return instruction.  */
+
+static int
+ns32k_about_to_return (pc)
+     CORE_ADDR pc;
+{
+  return (read_memory_integer (pc, 1) == 0x12);
+}
+
+
+/*
+ * Get the address of the enter opcode for the function
+ * containing PC, if there is an enter for the function,
+ * and if the pc is between the enter and exit.
+ * Returns positive address if pc is between enter/exit,
+ * 1 if pc before enter or after exit, 0 otherwise.
+ */
+
+CORE_ADDR
+ns32k_get_enter_addr (pc)
+     CORE_ADDR pc;
+{
+  CORE_ADDR enter_addr;
+  unsigned char op;
+
+  if (pc == 0)
+    return 0;
+
+  if (ns32k_about_to_return (pc))
+    return 1;		/* after exit */
+
+  enter_addr = get_pc_function_start (pc);
+
+  if (pc == enter_addr) 
+    return 1;		/* before enter */
+
+  op = read_memory_integer (enter_addr, 1);
+
+  if (op != 0x82)
+    return 0;		/* function has no enter/exit */
+
+  return enter_addr;	/* pc is between enter and exit */
+}