Initial revision

1 files changed, 919 insertions, 0 deletions

diff --git a/gdb/mn10200-tdep.c b/gdb/mn10200-tdep.c
new file mode 100644
index 00000000000..cb7ead09313
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+++ b/gdb/mn10200-tdep.c
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+/* Target-dependent code for the Matsushita MN10200 for GDB, the GNU debugger.
+   Copyright 1997 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"
+
+  	
+/* Should call_function allocate stack space for a struct return?  */
+int
+mn10200_use_struct_convention (gcc_p, type)
+     int gcc_p;
+     struct type *type;
+{
+  return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8);
+}
+
+
+
+/* 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 mn10200:
+
+     With frame pointer:
+	mov fp,a0
+	mov sp,fp
+	add <size>,sp
+	Register saves for d2, d3, a1, a2 as needed.  Saves start
+	at fp - <size> + <outgoing_args_size> and work towards higher
+	addresses.  Note that the saves are actually done off the stack
+	pointer in the prologue!  This makes for smaller code and easier
+	prologue scanning as the displacement fields will unlikely
+        be more than 8 bits!
+
+     Without frame pointer:
+        add <size>,sp
+	Register saves for d2, d3, a1, a2 as needed.  Saves start
+	at sp + <outgoing_args_size> and work towards higher addresses.
+
+     Out of line prologue:
+	add <local size>,sp  -- optional
+	jsr __prologue
+	add <outgoing_size>,sp -- optional
+
+   The stack pointer remains constant throughout the life of most
+   functions.  As a result the compiler will usually omit the
+   frame pointer, so we must handle frame pointerless functions.  */
+
+/* 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 mn10200_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).
+
+      CALLER_A2_IN_A0: $a2 from the caller's frame is temporarily
+      in $a0.  This can happen if we're stopped in the prologue.
+
+      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.  */
+
+#define MY_FRAME_IN_SP 0x1
+#define MY_FRAME_IN_FP 0x2
+#define CALLER_A2_IN_A0 0x4
+#define NO_MORE_FRAMES 0x8
+ 
+static CORE_ADDR
+mn10200_analyze_prologue (fi, pc)
+    struct frame_info *fi;
+    CORE_ADDR pc;
+{
+  CORE_ADDR func_addr, func_end, addr, stop;
+  CORE_ADDR stack_size;
+  unsigned char buf[4];
+  int status;
+  char *name;
+  int out_of_line_prologue = 0;
+
+  /* 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)
+        fi->status = NO_MORE_FRAMES;
+      return pc;
+    }
+
+  /* At the start of a function our frame is in the stack pointer.  */
+  if (fi)
+    fi->status = MY_FRAME_IN_SP;
+
+  /* If we're physically on an RTS instruction, then our frame has already
+     been deallocated.
+
+     fi->frame is bogus, we need to fix it.  */
+  if (fi && fi->pc + 1 == func_end)
+    {
+      status = target_read_memory (fi->pc, buf, 1);
+      if (status != 0)
+	{
+	  if (fi->next == NULL)
+	    fi->frame = read_sp ();
+	  return fi->pc;
+	}
+
+      if (buf[0] == 0xfe)
+	{
+	  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;
+
+  status = target_read_memory (addr, buf, 2);
+  if (status != 0)
+    {
+      if (fi && fi->next == NULL && fi->status & MY_FRAME_IN_SP)
+	fi->frame = read_sp ();
+      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] == 0xdf
+      || (buf[0] == 0xf4 && buf[1] == 0x77))
+    {
+      if (fi)
+	fi->status = NO_MORE_FRAMES;
+      return addr;
+    }
+
+  /* Now see if we have a frame pointer.
+       
+     Search for mov a2,a0 (0xf278)
+        then	mov a3,a2 (0xf27e).  */
+
+  if (buf[0] == 0xf2 && buf[1] == 0x78)
+    {
+      /* Our caller's $a2 will be found in $a0 now.  Note it for
+	 our callers.  */
+      if (fi)
+	fi->status |= CALLER_A2_IN_A0;
+      addr += 2;
+      if (addr >= stop)
+	{
+	  /* We still haven't allocated our local stack.  Handle this
+	     as if we stopped on the first or last insn of a function.   */
+	  if (fi && fi->next == NULL)
+	    fi->frame = read_sp ();
+	  return addr;
+	}
+
+      status = target_read_memory (addr, buf, 2);
+      if (status != 0)
+	{
+	  if (fi && fi->next == NULL)
+	    fi->frame = read_sp ();
+	  return addr;
+	}
+      if (buf[0] == 0xf2 && buf[1] == 0x7e)
+	{
+	  addr += 2;
+
+	  /* Our frame pointer is valid now.  */
+	  if (fi)
+	    {
+	      fi->status |= MY_FRAME_IN_FP;
+	      fi->status &= ~MY_FRAME_IN_SP;
+	    }
+	  if (addr >= stop)
+	    return addr;
+	}
+      else
+	{
+	  if (fi && fi->next == NULL)
+	    fi->frame = read_sp ();
+	  return addr;
+	}
+    }
+
+  /* Next we should allocate the local frame.
+       
+     Search for add imm8,a3 (0xd3XX)
+        or	add imm16,a3 (0xf70bXXXX)
+        or	add imm24,a3 (0xf467XXXXXX).
+       
+     If none of the above was found, then this prologue has
+     no stack, and therefore can't have any register saves,
+     so quit now.  */
+  status = target_read_memory (addr, buf, 2);
+  if (status != 0)
+    {
+      if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+	fi->frame = read_sp ();
+      return addr;
+    }
+  if (buf[0] == 0xd3)
+    {
+      stack_size = extract_signed_integer (&buf[1], 1);
+      if (fi)
+	fi->stack_size = stack_size;
+      addr += 2;
+      if (addr >= stop)
+	{
+	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+	    fi->frame = read_sp () - stack_size;
+	  return addr;
+	}
+    }
+  else if (buf[0] == 0xf7 && buf[1] == 0x0b)
+    {
+      status = target_read_memory (addr + 2, buf, 2);
+      if (status != 0)
+	{
+	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+	    fi->frame = read_sp ();
+	  return addr;
+	}
+      stack_size = extract_signed_integer (buf, 2);
+      if (fi)
+	fi->stack_size = stack_size;
+      addr += 4;
+      if (addr >= stop)
+	{
+	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+	    fi->frame = read_sp () - stack_size;
+	  return addr;
+	}
+    }
+  else if (buf[0] == 0xf4 && buf[1] == 0x67)
+    {
+      status = target_read_memory (addr + 2, buf, 3);
+      if (status != 0)
+	{
+	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+	    fi->frame = read_sp ();
+	  return addr;
+	}
+      stack_size = extract_signed_integer (buf, 3);
+      if (fi)
+	fi->stack_size = stack_size;
+      addr += 5;
+      if (addr >= stop)
+	{
+	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+	    fi->frame = read_sp () - stack_size;
+	  return addr;
+	}
+    }
+
+  /* Now see if we have a call to __prologue for an out of line
+     prologue.  */
+  status = target_read_memory (addr, buf, 2);
+  if (status != 0)
+    return addr;
+
+  /* First check for 16bit pc-relative call to __prologue.  */
+  if (buf[0] == 0xfd)
+    {
+      CORE_ADDR temp;
+      status = target_read_memory (addr + 1, buf, 2);
+      if (status != 0)
+	{
+  	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+    	    fi->frame = read_sp ();
+	  return addr;
+	}
+      
+      /* Get the PC this instruction will branch to.  */
+      temp = (extract_signed_integer (buf, 2) + addr + 3) & 0xffffff;
+
+      /* Get the name of the function at the target address.  */
+      status = find_pc_partial_function (temp, &name, NULL, NULL);
+      if (status == 0)
+	{
+  	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+    	    fi->frame = read_sp ();
+	  return addr;
+	}
+
+      /* Note if it is an out of line prologue.  */
+      out_of_line_prologue = (strcmp (name, "__prologue") == 0);
+
+      /* This sucks up 3 bytes of instruction space.  */
+      if (out_of_line_prologue)
+	addr += 3;
+
+      if (addr >= stop)
+	{
+	  if (fi && fi->next == NULL)
+	    {
+	      fi->stack_size -= 16;
+	      fi->frame = read_sp () - fi->stack_size;
+	    }
+	  return addr;
+	}
+    }
+  /* Now check for the 24bit pc-relative call to __prologue.  */
+  else if (buf[0] == 0xf4 && buf[1] == 0xe1)
+    {
+      CORE_ADDR temp;
+      status = target_read_memory (addr + 2, buf, 3);
+      if (status != 0)
+	{
+  	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+    	    fi->frame = read_sp ();
+	  return addr;
+	}
+      
+      /* Get the PC this instruction will branch to.  */
+      temp = (extract_signed_integer (buf, 3) + addr + 5) & 0xffffff;
+
+      /* Get the name of the function at the target address.  */
+      status = find_pc_partial_function (temp, &name, NULL, NULL);
+      if (status == 0)
+	{
+  	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+    	    fi->frame = read_sp ();
+	  return addr;
+	}
+
+      /* Note if it is an out of line prologue.  */
+      out_of_line_prologue = (strcmp (name, "__prologue") == 0);
+
+      /* This sucks up 5 bytes of instruction space.  */
+      if (out_of_line_prologue)
+	addr += 5;
+
+      if (addr >= stop)
+	{
+	  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
+	    {
+	      fi->stack_size -= 16;
+	      fi->frame = read_sp () - fi->stack_size;
+	    }
+	  return addr;
+	}
+    }
+
+  /* Now actually handle the out of line prologue.  */
+  if (out_of_line_prologue)
+    {
+      int outgoing_args_size = 0;
+
+      /* First adjust the stack size for this function.  The out of
+	 line prologue saves 4 registers (16bytes of data).  */
+      if (fi)
+	fi->stack_size -= 16;
+
+      /* Update fi->frame if necessary.  */
+      if (fi && fi->next == NULL)
+	fi->frame = read_sp () - fi->stack_size;
+
+      /* After the out of line prologue, there may be another
+	 stack adjustment for the outgoing arguments.
+
+	 Search for add imm8,a3 (0xd3XX)
+	    or	add imm16,a3 (0xf70bXXXX)
+	    or	add imm24,a3 (0xf467XXXXXX).  */
+       
+      status = target_read_memory (addr, buf, 2);
+      if (status != 0)
+	{
+	  if (fi)
+	    {
+	      fi->fsr.regs[2] = fi->frame + fi->stack_size + 4;
+	      fi->fsr.regs[3] = fi->frame + fi->stack_size + 8;
+	      fi->fsr.regs[5] = fi->frame + fi->stack_size + 12;
+	      fi->fsr.regs[6] = fi->frame + fi->stack_size + 16;
+	    }
+	  return addr;
+	}
+
+      if (buf[0] == 0xd3)
+	{
+	  outgoing_args_size = extract_signed_integer (&buf[1], 1);
+	  addr += 2;
+	}
+      else if (buf[0] == 0xf7 && buf[1] == 0x0b)
+	{
+	  status = target_read_memory (addr + 2, buf, 2);
+	  if (status != 0)
+	    {
+	      if (fi)
+		{
+		  fi->fsr.regs[2] = fi->frame + fi->stack_size + 4;
+		  fi->fsr.regs[3] = fi->frame + fi->stack_size + 8;
+		  fi->fsr.regs[5] = fi->frame + fi->stack_size + 12;
+		  fi->fsr.regs[6] = fi->frame + fi->stack_size + 16;
+		}
+	      return addr;
+	    }
+	  outgoing_args_size = extract_signed_integer (buf, 2);
+	  addr += 4;
+	}
+      else if (buf[0] == 0xf4 && buf[1] == 0x67)
+	{
+	  status = target_read_memory (addr + 2, buf, 3);
+	  if (status != 0)
+	    {
+	      if (fi && fi->next == NULL)
+		{
+		  fi->fsr.regs[2] = fi->frame + fi->stack_size + 4;
+		  fi->fsr.regs[3] = fi->frame + fi->stack_size + 8;
+		  fi->fsr.regs[5] = fi->frame + fi->stack_size + 12;
+		  fi->fsr.regs[6] = fi->frame + fi->stack_size + 16;
+		}
+	      return addr;
+	    }
+	  outgoing_args_size = extract_signed_integer (buf, 3);
+	  addr += 5;
+	}
+      else
+	outgoing_args_size = 0;
+
+      /* Now that we know the size of the outgoing arguments, fix
+	 fi->frame again if this is the innermost frame.  */
+      if (fi && fi->next == NULL)
+	fi->frame -= outgoing_args_size;
+
+      /* Note the register save information and update the stack
+	 size for this frame too.  */
+      if (fi)
+	{
+	  fi->fsr.regs[2] = fi->frame + fi->stack_size + 4;
+	  fi->fsr.regs[3] = fi->frame + fi->stack_size + 8;
+	  fi->fsr.regs[5] = fi->frame + fi->stack_size + 12;
+	  fi->fsr.regs[6] = fi->frame + fi->stack_size + 16;
+	  fi->stack_size += outgoing_args_size;
+	}
+      /* There can be no more prologue insns, so return now.  */
+      return addr;
+    }
+
+  /* At this point fi->frame needs to be correct.
+
+     If MY_FRAME_IN_SP is set and we're the innermost frame, then we
+     need to fix fi->frame so that backtracing, find_frame_saved_regs,
+     etc work correctly.  */
+  if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP) != 0)
+    fi->frame = read_sp () - fi->stack_size;
+
+  /* And last we have the register saves.  These are relatively
+     simple because they're physically done off the stack pointer,
+     and thus the number of different instructions we need to
+     check is greatly reduced because we know the displacements
+     will be small.
+       
+     Search for movx d2,(X,a3) (0xf55eXX)
+        then	movx d3,(X,a3) (0xf55fXX)
+        then	mov  a1,(X,a3) (0x5dXX)	   No frame pointer case
+        then	mov  a2,(X,a3) (0x5eXX)	   No frame pointer case
+        or  mov  a0,(X,a3) (0x5cXX)	   Frame pointer case.  */
+
+  status = target_read_memory (addr, buf, 2);
+  if (status != 0)
+    return addr;
+  if (buf[0] == 0xf5 && buf[1] == 0x5e)
+    {
+      if (fi)
+	{
+	  status = target_read_memory (addr + 2, buf, 1);
+	  if (status != 0)
+	    return addr;
+	  fi->fsr.regs[2] = (fi->frame + stack_size
+			     + extract_signed_integer (buf, 1));
+	}
+      addr += 3;
+      if (addr >= stop)
+	return addr;
+      status = target_read_memory (addr, buf, 2);
+      if (status != 0)
+	return addr;
+    }
+  if (buf[0] == 0xf5 && buf[1] == 0x5f)
+    {
+      if (fi)
+	{
+	  status = target_read_memory (addr + 2, buf, 1);
+	  if (status != 0)
+	    return addr;
+	  fi->fsr.regs[3] = (fi->frame + stack_size
+			     + extract_signed_integer (buf, 1));
+	}
+      addr += 3;
+      if (addr >= stop)
+	return addr;
+      status = target_read_memory (addr, buf, 2);
+      if (status != 0)
+	return addr;
+    }
+  if (buf[0] == 0x5d)
+    {
+      if (fi)
+	{
+	  status = target_read_memory (addr + 1, buf, 1);
+	  if (status != 0)
+	    return addr;
+	  fi->fsr.regs[5] = (fi->frame + stack_size
+			     + extract_signed_integer (buf, 1));
+	}
+      addr += 2;
+      if (addr >= stop)
+	return addr;
+      status = target_read_memory (addr, buf, 2);
+      if (status != 0)
+	return addr;
+    }
+  if (buf[0] == 0x5e || buf[0] == 0x5c)
+    {
+      if (fi)
+	{
+	  status = target_read_memory (addr + 1, buf, 1);
+	  if (status != 0)
+	    return addr;
+	  fi->fsr.regs[6] = (fi->frame + stack_size
+			     + extract_signed_integer (buf, 1));
+	  fi->status &= ~CALLER_A2_IN_A0;
+	}
+      addr += 2;
+      if (addr >= stop)
+	return addr;
+      return addr;
+    }
+  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
+mn10200_frame_chain (fi)
+     struct frame_info *fi;
+{
+  struct frame_info dummy_frame;
+
+  /* Walk through the prologue to determine the stack size,
+     location of saved registers, end of the prologue, etc.  */
+  if (fi->status == 0)
+    mn10200_analyze_prologue (fi, (CORE_ADDR)0);
+
+  /* Quit now if mn10200_analyze_prologue set NO_MORE_FRAMES.  */
+  if (fi->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 $a2 to our function.
+
+	 If CALLER_A2_IN_A0, then the chain is in $a0.
+
+	 If fsr.regs[6] is nonzero, then it's at the memory
+	 location pointed to by fsr.regs[6].
+
+	 Else it's still in $a2.
+
+       If our caller does not have a frame pointer, then his
+       frame base is fi->frame + -caller's stack size + 4.  */
+       
+  /* The easiest way to get that info is to analyze our caller's frame.
+
+     So we set up a dummy frame and call mn10200_analyze_prologue to
+     find stuff for us.  */
+  dummy_frame.pc = FRAME_SAVED_PC (fi);
+  dummy_frame.frame = fi->frame;
+  memset (dummy_frame.fsr.regs, '\000', sizeof dummy_frame.fsr.regs);
+  dummy_frame.status = 0;
+  dummy_frame.stack_size = 0;
+  mn10200_analyze_prologue (&dummy_frame);
+
+  if (dummy_frame.status & MY_FRAME_IN_FP)
+    {
+      /* Our caller has a frame pointer.  So find the frame in $a2, $a0,
+	 or in the stack.  */
+      if (fi->fsr.regs[6])
+	return (read_memory_integer (fi->fsr.regs[FP_REGNUM], REGISTER_SIZE)
+		& 0xffffff);
+      else if (fi->status & CALLER_A2_IN_A0)
+	return read_register (4);
+      else
+	return read_register (FP_REGNUM);
+    }
+  else
+    {
+      /* Our caller does not have a frame pointer.  So his frame starts
+	 at the base of our frame (fi->frame) + <his size> + 4 (saved pc).  */
+      return fi->frame + -dummy_frame.stack_size + 4;
+    }
+}
+
+/* Function: skip_prologue
+   Return the address of the first inst past the prologue of the function.  */
+
+CORE_ADDR
+mn10200_skip_prologue (pc)
+     CORE_ADDR pc;
+{
+  /* We used to check the debug symbols, but that can lose if
+     we have a null prologue.  */
+  return mn10200_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
+mn10200_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->fsr.regs[regnum] != 0)
+	  {
+	    ULONGEST value;
+
+	    value = read_memory_unsigned_integer (frame->fsr.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
+mn10200_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 two byte aligned on the mn10200.  */
+  sp &= ~1;
+
+  /* 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])) + 1) & ~1;
+
+      /* If we've used all argument registers, then this argument is
+	 pushed.  */
+      if (regsused >= 2 || arg_length > 4)
+	{
+	  regsused = 2;
+	  len += arg_length;
+	}
+      /* We know we've got some arg register space left.  If this argument
+	 will fit entirely in regs, then put it there.  */
+      else if (arg_length <= 2
+	       || TYPE_CODE (VALUE_TYPE (args[argnum])) == TYPE_CODE_PTR) 
+	{
+	  regsused++;
+	}
+      else if (regsused == 0)
+	{
+	  regsused = 2;
+	}
+      else
+	{
+	  regsused = 2;
+	  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);
+	}
+
+      if (regsused < 2
+	  && (len <= 2
+	      || TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_PTR))
+	{
+	  write_register (regsused, extract_unsigned_integer (val, 4));
+	  regsused++;
+	}
+      else if (regsused == 0 && len == 4)
+	{
+	  write_register (regsused, extract_unsigned_integer (val, 2));
+	  write_register (regsused + 1, extract_unsigned_integer (val + 2, 2));
+	  regsused = 2;
+	}
+      else
+	{
+	  regsused = 2;
+	  while (len > 0)
+	    {
+	      write_memory (sp + stack_offset, val, 2);
+
+	      len -= 2;
+	      val += 2;
+	      stack_offset += 2;
+	    }
+	}
+      args++;
+    }
+
+  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
+mn10200_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
+mn10200_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
+mn10200_frame_saved_pc (fi)
+     struct frame_info *fi;
+{
+  /* The saved PC will always be at the base of the current frame.  */
+  return (read_memory_integer (fi->frame, REGISTER_SIZE) & 0xffffff);
+}
+
+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: init_extra_frame_info
+   Setup the frame's frame pointer, pc, and frame addresses for saved
+   registers.  Most of the work is done in mn10200_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.  mn10200_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
+mn10200_init_extra_frame_info (fi)
+     struct frame_info *fi;
+{
+  if (fi->next)
+    fi->pc = FRAME_SAVED_PC (fi->next);
+
+  memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
+  fi->status = 0;
+  fi->stack_size = 0;
+
+  mn10200_analyze_prologue (fi, 0);
+}
+
+void
+_initialize_mn10200_tdep ()
+{
+  tm_print_insn = print_insn_mn10200;
+}
+