Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 791 insertions, 0 deletions

diff --git a/gdb/mn10300-tdep.c b/gdb/mn10300-tdep.c
new file mode 100644
index 0000000..6c43176
--- /dev/null
+++ b/gdb/mn10300-tdep.c
@@ -0,0 +1,791 @@
+/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
+   Copyright 1996, 1997, 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 "frame.h"
+#include "inferior.h"
+#include "obstack.h"
+#include "target.h"
+#include "value.h"
+#include "bfd.h"
+#include "gdb_string.h"
+#include "gdbcore.h"
+#include "symfile.h"
+
+static char *mn10300_generic_register_names[] = 
+{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+  "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
+  "", "", "", "", "", "", "", "",
+  "", "", "", "", "", "", "", "fp" };
+
+char **mn10300_register_names = mn10300_generic_register_names;
+
+static CORE_ADDR mn10300_analyze_prologue PARAMS ((struct frame_info *fi,
+						  CORE_ADDR pc));
+
+/* Additional info used by the frame */
+
+struct frame_extra_info
+{
+  int status;
+  int stack_size;
+};
+
+static struct frame_info *analyze_dummy_frame PARAMS ((CORE_ADDR, CORE_ADDR));
+static struct frame_info *
+analyze_dummy_frame (pc, frame)
+     CORE_ADDR pc;
+     CORE_ADDR frame;
+{
+  static struct frame_info *dummy = NULL;
+  if (dummy == NULL)
+    {
+      dummy = xmalloc (sizeof (struct frame_info));
+      dummy->saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS);
+      dummy->extra_info = xmalloc (sizeof (struct frame_extra_info));
+    }
+  dummy->next = NULL;
+  dummy->prev = NULL;
+  dummy->pc = pc;
+  dummy->frame = frame;
+  dummy->extra_info->status = 0;
+  dummy->extra_info->stack_size = 0;
+  memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS);
+  mn10300_analyze_prologue (dummy, 0);
+  return dummy;
+}
+
+/* Values for frame_info.status */
+
+#define MY_FRAME_IN_SP 0x1
+#define MY_FRAME_IN_FP 0x2
+#define NO_MORE_FRAMES 0x4
+
+
+/* Should call_function allocate stack space for a struct return?  */
+int
+mn10300_use_struct_convention (gcc_p, type)
+     int gcc_p;
+     struct type *type;
+{
+  return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8);
+}
+
+/* The breakpoint instruction must be the same size as the smallest
+   instruction in the instruction set.
+
+   The Matsushita mn10x00 processors have single byte instructions
+   so we need a single byte breakpoint.  Matsushita hasn't defined
+   one, so we defined it ourselves.  */
+
+unsigned char *
+mn10300_breakpoint_from_pc (bp_addr, bp_size)
+     CORE_ADDR *bp_addr;
+     int *bp_size;
+{
+  static char breakpoint[] = {0xff};
+  *bp_size = 1;
+  return breakpoint;
+}
+
+
+/* Fix fi->frame if it's bogus at this point.  This is a helper
+   function for mn10300_analyze_prologue. */
+
+static void
+fix_frame_pointer (fi, stack_size)
+    struct frame_info *fi;
+    int stack_size;
+{
+  if (fi && fi->next == NULL)
+    {
+      if (fi->extra_info->status & MY_FRAME_IN_SP)
+	fi->frame = read_sp () - stack_size;
+      else if (fi->extra_info->status & MY_FRAME_IN_FP)
+	fi->frame = read_register (A3_REGNUM);
+    }
+}
+
+
+/* Set offsets of registers saved by movm instruction.
+   This is a helper function for mn10300_analyze_prologue.  */
+
+static void
+set_movm_offsets (fi, movm_args)
+    struct frame_info *fi;
+    int movm_args;
+{
+  int offset = 0;
+
+  if (fi == NULL || movm_args == 0)
+    return;
+
+  if (movm_args & 0x10)
+    {
+      fi->saved_regs[A3_REGNUM] = fi->frame + offset;
+      offset += 4;
+    }
+  if (movm_args & 0x20)
+    {
+      fi->saved_regs[A2_REGNUM] = fi->frame + offset;
+      offset += 4;
+    }
+  if (movm_args & 0x40)
+    {
+      fi->saved_regs[D3_REGNUM] = fi->frame + offset;
+      offset += 4;
+    }
+  if (movm_args & 0x80)
+    {
+      fi->saved_regs[D2_REGNUM] = fi->frame + offset;
+      offset += 4;
+    }
+}
+
+
+/* The main purpose of this file is dealing with prologues to extract
+   information about stack frames and saved registers.
+
+   For reference here's how prologues look on the mn10300:
+
+     With frame pointer:
+	movm [d2,d3,a2,a3],sp
+	mov sp,a3
+	add <size>,sp
+
+     Without frame pointer:
+	movm [d2,d3,a2,a3],sp (if needed)
+        add <size>,sp
+
+   One day we might keep the stack pointer constant, that won't
+   change the code for prologues, but it will make the frame
+   pointerless case much more common.  */
+	
+/* Analyze the prologue to determine where registers are saved,
+   the end of the prologue, etc etc.  Return the end of the prologue
+   scanned.
+
+   We store into FI (if non-null) several tidbits of information:
+
+    * stack_size -- size of this stack frame.  Note that if we stop in
+    certain parts of the prologue/epilogue we may claim the size of the
+    current frame is zero.  This happens when the current frame has
+    not been allocated yet or has already been deallocated.
+
+    * fsr -- Addresses of registers saved in the stack by this frame.
+
+    * status -- A (relatively) generic status indicator.  It's a bitmask
+    with the following bits: 
+
+      MY_FRAME_IN_SP: The base of the current frame is actually in
+      the stack pointer.  This can happen for frame pointerless
+      functions, or cases where we're stopped in the prologue/epilogue
+      itself.  For these cases mn10300_analyze_prologue will need up
+      update fi->frame before returning or analyzing the register
+      save instructions.
+
+      MY_FRAME_IN_FP: The base of the current frame is in the
+      frame pointer register ($a2).
+
+      NO_MORE_FRAMES: Set this if the current frame is "start" or
+      if the first instruction looks like mov <imm>,sp.  This tells
+      frame chain to not bother trying to unwind past this frame.  */
+
+static CORE_ADDR
+mn10300_analyze_prologue (fi, pc)
+    struct frame_info *fi;
+    CORE_ADDR pc;
+{
+  CORE_ADDR func_addr, func_end, addr, stop;
+  CORE_ADDR stack_size;
+  int imm_size;
+  unsigned char buf[4];
+  int status, movm_args = 0;
+  char *name;
+
+  /* Use the PC in the frame if it's provided to look up the
+     start of this function.  */
+  pc = (fi ? fi->pc : pc);
+
+  /* Find the start of this function.  */
+  status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
+
+  /* Do nothing if we couldn't find the start of this function or if we're
+     stopped at the first instruction in the prologue.  */
+  if (status == 0)
+    return pc;
+
+  /* If we're in start, then give up.  */
+  if (strcmp (name, "start") == 0)
+    {
+      if (fi != NULL)
+	fi->extra_info->status = NO_MORE_FRAMES;
+      return pc;
+    }
+
+  /* At the start of a function our frame is in the stack pointer.  */
+  if (fi)
+    fi->extra_info->status = MY_FRAME_IN_SP;
+
+  /* Get the next two bytes into buf, we need two because rets is a two
+     byte insn and the first isn't enough to uniquely identify it.  */
+  status = read_memory_nobpt (pc, buf, 2);
+  if (status != 0)
+    return pc;
+
+  /* If we're physically on an "rets" instruction, then our frame has
+     already been deallocated.  Note this can also be true for retf
+     and ret if they specify a size of zero.
+
+     In this case fi->frame is bogus, we need to fix it.  */
+  if (fi && buf[0] == 0xf0 && buf[1] == 0xfc)
+    {
+      if (fi->next == NULL)
+	fi->frame = read_sp ();
+      return fi->pc;
+    }
+
+  /* Similarly if we're stopped on the first insn of a prologue as our
+     frame hasn't been allocated yet.  */
+  if (fi && fi->pc == func_addr)
+    {
+      if (fi->next == NULL)
+	fi->frame = read_sp ();
+      return fi->pc;
+    }
+
+  /* Figure out where to stop scanning.  */
+  stop = fi ? fi->pc : func_end;
+
+  /* Don't walk off the end of the function.  */
+  stop = stop > func_end ? func_end : stop;
+
+  /* Start scanning on the first instruction of this function.  */
+  addr = func_addr;
+
+  /* Suck in two bytes.  */
+  status = read_memory_nobpt (addr, buf, 2);
+  if (status != 0)
+    {
+      fix_frame_pointer (fi, 0);
+      return addr;
+    }
+
+  /* First see if this insn sets the stack pointer; if so, it's something
+     we won't understand, so quit now.   */
+  if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
+    {
+      if (fi)
+	fi->extra_info->status = NO_MORE_FRAMES;
+      return addr;
+    }
+
+  /* Now look for movm [regs],sp, which saves the callee saved registers.
+
+     At this time we don't know if fi->frame is valid, so we only note
+     that we encountered a movm instruction.  Later, we'll set the entries
+     in fsr.regs as needed.  */
+  if (buf[0] == 0xcf)
+    {
+      /* Extract the register list for the movm instruction.  */
+      status = read_memory_nobpt (addr + 1, buf, 1);
+      movm_args = *buf;
+
+      addr += 2;
+
+      /* Quit now if we're beyond the stop point.  */
+      if (addr >= stop)
+	{
+	  /* Fix fi->frame since it's bogus at this point.  */
+	  if (fi && fi->next == NULL)
+	    fi->frame = read_sp ();
+
+	  /* Note if/where callee saved registers were saved.  */
+	  set_movm_offsets (fi, movm_args);
+	  return addr;
+	}
+
+      /* Get the next two bytes so the prologue scan can continue.  */
+      status = read_memory_nobpt (addr, buf, 2);
+      if (status != 0)
+	{
+	  /* Fix fi->frame since it's bogus at this point.  */
+	  if (fi && fi->next == NULL)
+	    fi->frame = read_sp ();
+
+	  /* Note if/where callee saved registers were saved.  */
+	  set_movm_offsets (fi, movm_args);
+	  return addr;
+	}
+    }
+
+  /* Now see if we set up a frame pointer via "mov sp,a3" */
+  if (buf[0] == 0x3f)
+    {
+      addr += 1;
+
+      /* The frame pointer is now valid.  */
+      if (fi)
+	{
+	  fi->extra_info->status |= MY_FRAME_IN_FP;
+	  fi->extra_info->status &= ~MY_FRAME_IN_SP;
+	}
+
+      /* Quit now if we're beyond the stop point.  */
+      if (addr >= stop)
+	{
+	  /* Fix fi->frame if it's bogus at this point.  */
+	  fix_frame_pointer (fi, 0);
+
+	  /* Note if/where callee saved registers were saved.  */
+	  set_movm_offsets (fi, movm_args);
+	  return addr;
+	}
+
+      /* Get two more bytes so scanning can continue.  */
+      status = read_memory_nobpt (addr, buf, 2);
+      if (status != 0)
+	{
+	  /* Fix fi->frame if it's bogus at this point.  */
+	  fix_frame_pointer (fi, 0);
+
+	  /* Note if/where callee saved registers were saved.  */
+	  set_movm_offsets (fi, movm_args);
+	  return addr;
+	}
+    }
+  
+  /* Next we should allocate the local frame.  No more prologue insns
+     are found after allocating the local frame.
+       
+     Search for add imm8,sp (0xf8feXX)
+        or	add imm16,sp (0xfafeXXXX)
+        or	add imm32,sp (0xfcfeXXXXXXXX).
+       
+     If none of the above was found, then this prologue has no 
+     additional stack.  */
+
+  status = read_memory_nobpt (addr, buf, 2);
+  if (status != 0)
+    {
+      /* Fix fi->frame if it's bogus at this point.  */
+      fix_frame_pointer (fi, 0);
+
+      /* Note if/where callee saved registers were saved.  */
+      set_movm_offsets (fi, movm_args);
+      return addr;
+    }
+
+  imm_size = 0;
+  if (buf[0] == 0xf8 && buf[1] == 0xfe)
+    imm_size = 1;
+  else if (buf[0] == 0xfa && buf[1] == 0xfe)
+    imm_size = 2;
+  else if (buf[0] == 0xfc && buf[1] == 0xfe)
+    imm_size = 4;
+
+  if (imm_size != 0)
+    {
+      /* Suck in imm_size more bytes, they'll hold the size of the
+         current frame.  */
+      status = read_memory_nobpt (addr + 2, buf, imm_size);
+      if (status != 0)
+	{
+	  /* Fix fi->frame if it's bogus at this point.  */
+	  fix_frame_pointer (fi, 0);
+
+	  /* Note if/where callee saved registers were saved.  */
+	  set_movm_offsets (fi, movm_args);
+	  return addr;
+	}
+
+      /* Note the size of the stack in the frame info structure.  */
+      stack_size = extract_signed_integer (buf, imm_size);
+      if (fi)
+	fi->extra_info->stack_size = stack_size;
+
+      /* We just consumed 2 + imm_size bytes.  */
+      addr += 2 + imm_size;
+
+      /* No more prologue insns follow, so begin preparation to return.  */
+      /* Fix fi->frame if it's bogus at this point.  */
+      fix_frame_pointer (fi, stack_size);
+
+      /* Note if/where callee saved registers were saved.  */
+      set_movm_offsets (fi, movm_args);
+      return addr;
+    }
+
+  /* We never found an insn which allocates local stack space, regardless
+     this is the end of the prologue.  */
+  /* Fix fi->frame if it's bogus at this point.  */
+  fix_frame_pointer (fi, 0);
+
+  /* Note if/where callee saved registers were saved.  */
+  set_movm_offsets (fi, movm_args);
+  return addr;
+}
+  
+/* Function: frame_chain
+   Figure out and return the caller's frame pointer given current
+   frame_info struct.
+
+   We don't handle dummy frames yet but we would probably just return the
+   stack pointer that was in use at the time the function call was made?  */
+
+CORE_ADDR
+mn10300_frame_chain (fi)
+     struct frame_info *fi;
+{
+  struct frame_info *dummy;
+  /* Walk through the prologue to determine the stack size,
+     location of saved registers, end of the prologue, etc.  */
+  if (fi->extra_info->status == 0)
+    mn10300_analyze_prologue (fi, (CORE_ADDR)0);
+
+  /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES.  */
+  if (fi->extra_info->status & NO_MORE_FRAMES)
+    return 0;
+
+  /* Now that we've analyzed our prologue, determine the frame
+     pointer for our caller.
+
+       If our caller has a frame pointer, then we need to
+       find the entry value of $a3 to our function.
+
+	 If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory
+	 location pointed to by fsr.regs[A3_REGNUM].
+
+	 Else it's still in $a3.
+
+       If our caller does not have a frame pointer, then his
+       frame base is fi->frame + -caller's stack size.  */
+       
+  /* The easiest way to get that info is to analyze our caller's frame.
+     So we set up a dummy frame and call mn10300_analyze_prologue to
+     find stuff for us.  */
+  dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame);
+
+  if (dummy->extra_info->status & MY_FRAME_IN_FP)
+    {
+      /* Our caller has a frame pointer.  So find the frame in $a3 or
+         in the stack.  */
+      if (fi->saved_regs[A3_REGNUM])
+	return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE));
+      else
+	return read_register (A3_REGNUM);
+    }
+  else
+    {
+      int adjust = 0;
+
+      adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0);
+      adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0);
+      adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0);
+      adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0);
+
+      /* Our caller does not have a frame pointer.  So his frame starts
+	 at the base of our frame (fi->frame) + register save space
+	 + <his size>.  */
+      return fi->frame + adjust + -dummy->extra_info->stack_size;
+    }
+}
+
+/* Function: skip_prologue
+   Return the address of the first inst past the prologue of the function.  */
+
+CORE_ADDR
+mn10300_skip_prologue (pc)
+     CORE_ADDR pc;
+{
+  /* We used to check the debug symbols, but that can lose if
+     we have a null prologue.  */
+  return mn10300_analyze_prologue (NULL, pc);
+}
+
+
+/* Function: pop_frame
+   This routine gets called when either the user uses the `return'
+   command, or the call dummy breakpoint gets hit.  */
+
+void
+mn10300_pop_frame (frame)
+     struct frame_info *frame;
+{
+  int regnum;
+
+  if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
+    generic_pop_dummy_frame ();
+  else
+    {
+      write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+
+      /* Restore any saved registers.  */
+      for (regnum = 0; regnum < NUM_REGS; regnum++)
+	if (frame->saved_regs[regnum] != 0)
+	  {
+	    ULONGEST value;
+
+	    value = read_memory_unsigned_integer (frame->saved_regs[regnum],
+						  REGISTER_RAW_SIZE (regnum));
+	    write_register (regnum, value);
+	  }
+
+      /* Actually cut back the stack.  */
+      write_register (SP_REGNUM, FRAME_FP (frame));
+
+      /* Don't we need to set the PC?!?  XXX FIXME.  */
+    }
+
+  /* Throw away any cached frame information.  */
+  flush_cached_frames ();
+}
+
+/* Function: push_arguments
+   Setup arguments for a call to the target.  Arguments go in
+   order on the stack.  */
+
+CORE_ADDR
+mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr)
+     int nargs;
+     value_ptr *args;
+     CORE_ADDR sp;
+     unsigned char struct_return;
+     CORE_ADDR struct_addr;
+{
+  int argnum = 0;
+  int len = 0;
+  int stack_offset = 0;
+  int regsused = struct_return ? 1 : 0;
+
+  /* This should be a nop, but align the stack just in case something
+     went wrong.  Stacks are four byte aligned on the mn10300.  */
+  sp &= ~3;
+
+  /* Now make space on the stack for the args.
+
+     XXX This doesn't appear to handle pass-by-invisible reference
+     arguments.  */
+  for (argnum = 0; argnum < nargs; argnum++)
+    {
+      int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3;
+
+      while (regsused < 2 && arg_length > 0)
+	{
+	  regsused++;
+	  arg_length -= 4;
+	}
+      len += arg_length;
+    }
+
+  /* Allocate stack space.  */
+  sp -= len;
+
+  regsused = struct_return ? 1 : 0;
+  /* Push all arguments onto the stack. */
+  for (argnum = 0; argnum < nargs; argnum++)
+    {
+      int len;
+      char *val;
+
+      /* XXX Check this.  What about UNIONS?  */
+      if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
+	  && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
+	{
+	  /* XXX Wrong, we want a pointer to this argument.  */
+          len = TYPE_LENGTH (VALUE_TYPE (*args));
+          val = (char *)VALUE_CONTENTS (*args);
+	}
+      else
+	{
+	  len = TYPE_LENGTH (VALUE_TYPE (*args));
+	  val = (char *)VALUE_CONTENTS (*args);
+	}
+
+      while (regsused < 2 && len > 0)
+	{
+	  write_register (regsused, extract_unsigned_integer (val, 4));
+	  val += 4;
+	  len -= 4;
+	  regsused++;
+	}
+
+      while (len > 0)
+	{
+	  write_memory (sp + stack_offset, val, 4);
+	  len -= 4;
+	  val += 4;
+	  stack_offset += 4;
+	}
+
+      args++;
+    }
+
+  /* Make space for the flushback area.  */
+  sp -= 8;
+  return sp;
+}
+
+/* Function: push_return_address (pc)
+   Set up the return address for the inferior function call.
+   Needed for targets where we don't actually execute a JSR/BSR instruction */
+ 
+CORE_ADDR
+mn10300_push_return_address (pc, sp)
+     CORE_ADDR pc;
+     CORE_ADDR sp;
+{
+  unsigned char buf[4];
+
+  store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ());
+  write_memory (sp - 4, buf, 4);
+  return sp - 4;
+}
+
+/* Function: store_struct_return (addr,sp)
+   Store the structure value return address for an inferior function
+   call.  */
+ 
+CORE_ADDR
+mn10300_store_struct_return (addr, sp)
+     CORE_ADDR addr;
+     CORE_ADDR sp;
+{
+  /* The structure return address is passed as the first argument.  */
+  write_register (0, addr);
+  return sp;
+}
+ 
+/* Function: frame_saved_pc 
+   Find the caller of this frame.  We do this by seeing if RP_REGNUM
+   is saved in the stack anywhere, otherwise we get it from the
+   registers.  If the inner frame is a dummy frame, return its PC
+   instead of RP, because that's where "caller" of the dummy-frame
+   will be found.  */
+
+CORE_ADDR
+mn10300_frame_saved_pc (fi)
+     struct frame_info *fi;
+{
+  int adjust = 0;
+
+  adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0);
+  adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0);
+  adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0);
+  adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0);
+
+  return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE));
+}
+
+void
+get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+     char *raw_buffer;
+     int *optimized;
+     CORE_ADDR *addrp;
+     struct frame_info *frame;
+     int regnum;
+     enum lval_type *lval;
+{
+  generic_get_saved_register (raw_buffer, optimized, addrp, 
+			      frame, regnum, lval);
+}
+
+/* Function: mn10300_init_extra_frame_info
+   Setup the frame's frame pointer, pc, and frame addresses for saved
+   registers.  Most of the work is done in mn10300_analyze_prologue().
+
+   Note that when we are called for the last frame (currently active frame),
+   that fi->pc and fi->frame will already be setup.  However, fi->frame will
+   be valid only if this routine uses FP.  For previous frames, fi-frame will
+   always be correct.  mn10300_analyze_prologue will fix fi->frame if
+   it's not valid.
+
+   We can be called with the PC in the call dummy under two circumstances.
+   First, during normal backtracing, second, while figuring out the frame
+   pointer just prior to calling the target function (see run_stack_dummy).  */
+
+void
+mn10300_init_extra_frame_info (fi)
+     struct frame_info *fi;
+{
+  if (fi->next)
+    fi->pc = FRAME_SAVED_PC (fi->next);
+
+  frame_saved_regs_zalloc (fi);
+  fi->extra_info = (struct frame_extra_info *)
+    frame_obstack_alloc (sizeof (struct frame_extra_info));
+
+  fi->extra_info->status = 0;
+  fi->extra_info->stack_size = 0;
+
+  mn10300_analyze_prologue (fi, 0);
+}
+
+/* Function: mn10300_virtual_frame_pointer
+   Return the register that the function uses for a frame pointer, 
+   plus any necessary offset to be applied to the register before
+   any frame pointer offsets.  */
+
+void
+mn10300_virtual_frame_pointer (pc, reg, offset)
+     CORE_ADDR pc;
+     long *reg;
+     long *offset;
+{
+  struct frame_info *dummy = analyze_dummy_frame (pc, 0);
+  /* Set up a dummy frame_info, Analyze the prolog and fill in the
+     extra info.  */
+  /* Results will tell us which type of frame it uses.  */
+  if (dummy->extra_info->status & MY_FRAME_IN_SP)
+    {
+      *reg    = SP_REGNUM;
+      *offset = -(dummy->extra_info->stack_size);
+    }
+  else
+    {
+      *reg    = A3_REGNUM;
+      *offset = 0;
+    }
+}
+  
+/* This can be made more generic later.  */
+static void
+set_machine_hook (filename)
+     char *filename;
+{
+  int i;
+
+  if (bfd_get_mach (exec_bfd) == bfd_mach_mn10300
+      || bfd_get_mach (exec_bfd) == 0)
+    {
+      mn10300_register_names = mn10300_generic_register_names;
+    }
+
+}
+
+void
+_initialize_mn10300_tdep ()
+{
+/*  printf("_initialize_mn10300_tdep\n"); */
+
+  tm_print_insn = print_insn_mn10300;
+
+  specify_exec_file_hook (set_machine_hook);
+}
+