Obsolete fr30.

1 files changed, 601 insertions, 601 deletions

diff --git a/gdb/fr30-tdep.c b/gdb/fr30-tdep.c
index 09f886f..12e9f7e 100644
--- a/gdb/fr30-tdep.c
+++ b/gdb/fr30-tdep.c
@@ -1,601 +1,601 @@
-/* Target-dependent code for the Fujitsu FR30.
-   Copyright 1999, 2000, 2001 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"
-#include "regcache.h"
-
-/* An expression that tells us whether the function invocation represented
-   by FI does not have a frame on the stack associated with it.  */
-int
-fr30_frameless_function_invocation (struct frame_info *fi)
-{
-  int frameless;
-  CORE_ADDR func_start, after_prologue;
-  func_start = (get_pc_function_start ((fi)->pc) +
-		FUNCTION_START_OFFSET);
-  after_prologue = func_start;
-  after_prologue = SKIP_PROLOGUE (after_prologue);
-  frameless = (after_prologue == func_start);
-  return frameless;
-}
-
-/* Function: pop_frame
-   This routine gets called when either the user uses the `return'
-   command, or the call dummy breakpoint gets hit.  */
-
-void
-fr30_pop_frame (void)
-{
-  struct frame_info *frame = get_current_frame ();
-  int regnum;
-  CORE_ADDR sp = read_register (SP_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));
-
-      for (regnum = 0; regnum < NUM_REGS; regnum++)
-	if (frame->fsr.regs[regnum] != 0)
-	  {
-	    write_register (regnum,
-		      read_memory_unsigned_integer (frame->fsr.regs[regnum],
-					       REGISTER_RAW_SIZE (regnum)));
-	  }
-      write_register (SP_REGNUM, sp + frame->framesize);
-    }
-  flush_cached_frames ();
-}
-
-
-/* Function: fr30_store_return_value
-   Put a value where a caller expects to see it.  Used by the 'return'
-   command.  */
-void
-fr30_store_return_value (struct type *type,
-			 char *valbuf)
-{
-  /* Here's how the FR30 returns values (gleaned from gcc/config/
-     fr30/fr30.h):
-
-     If the return value is 32 bits long or less, it goes in r4.
-
-     If the return value is 64 bits long or less, it goes in r4 (most
-     significant word) and r5 (least significant word.
-
-     If the function returns a structure, of any size, the caller
-     passes the function an invisible first argument where the callee
-     should store the value.  But GDB doesn't let you do that anyway.
-
-     If you're returning a value smaller than a word, it's not really
-     necessary to zero the upper bytes of the register; the caller is
-     supposed to ignore them.  However, the FR30 typically keeps its
-     values extended to the full register width, so we should emulate
-     that.  */
-
-  /* The FR30 is big-endian, so if we return a small value (like a
-     short or a char), we need to position it correctly within the
-     register.  We round the size up to a register boundary, and then
-     adjust the offset so as to place the value at the right end.  */
-  int value_size = TYPE_LENGTH (type);
-  int returned_size = (value_size + FR30_REGSIZE - 1) & ~(FR30_REGSIZE - 1);
-  int offset = (REGISTER_BYTE (RETVAL_REG)
-		+ (returned_size - value_size));
-  char *zeros = alloca (returned_size);
-  memset (zeros, 0, returned_size);
-
-  write_register_bytes (REGISTER_BYTE (RETVAL_REG), zeros, returned_size);
-  write_register_bytes (offset, valbuf, value_size);
-}
-
-
-/* Function: skip_prologue
-   Return the address of the first code past the prologue of the function.  */
-
-CORE_ADDR
-fr30_skip_prologue (CORE_ADDR pc)
-{
-  CORE_ADDR func_addr, func_end;
-
-  /* See what the symbol table says */
-
-  if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
-    {
-      struct symtab_and_line sal;
-
-      sal = find_pc_line (func_addr, 0);
-
-      if (sal.line != 0 && sal.end < func_end)
-	{
-	  return sal.end;
-	}
-    }
-
-/* Either we didn't find the start of this function (nothing we can do),
-   or there's no line info, or the line after the prologue is after
-   the end of the function (there probably isn't a prologue). */
-
-  return pc;
-}
-
-
-/* Function: push_arguments
-   Setup arguments and RP for a call to the target.  First four args
-   go in FIRST_ARGREG -> LAST_ARGREG, subsequent args go on stack...
-   Structs are passed by reference.  XXX not right now Z.R.
-   64 bit quantities (doubles and long longs) may be split between
-   the regs and the stack.
-   When calling a function that returns a struct, a pointer to the struct
-   is passed in as a secret first argument (always in FIRST_ARGREG).
-
-   Stack space for the args has NOT been allocated: that job is up to us.
- */
-
-CORE_ADDR
-fr30_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
-		     int struct_return, CORE_ADDR struct_addr)
-{
-  int argreg;
-  int argnum;
-  int stack_offset;
-  struct stack_arg
-    {
-      char *val;
-      int len;
-      int offset;
-    };
-  struct stack_arg *stack_args =
-  (struct stack_arg *) alloca (nargs * sizeof (struct stack_arg));
-  int nstack_args = 0;
-
-  argreg = FIRST_ARGREG;
-
-  /* the struct_return pointer occupies the first parameter-passing reg */
-  if (struct_return)
-    write_register (argreg++, struct_addr);
-
-  stack_offset = 0;
-
-  /* Process args from left to right.  Store as many as allowed in
-     registers, save the rest to be pushed on the stack */
-  for (argnum = 0; argnum < nargs; argnum++)
-    {
-      char *val;
-      struct value *arg = args[argnum];
-      struct type *arg_type = check_typedef (VALUE_TYPE (arg));
-      struct type *target_type = TYPE_TARGET_TYPE (arg_type);
-      int len = TYPE_LENGTH (arg_type);
-      enum type_code typecode = TYPE_CODE (arg_type);
-      CORE_ADDR regval;
-      int newarg;
-
-      val = (char *) VALUE_CONTENTS (arg);
-
-      {
-	/* Copy the argument to general registers or the stack in
-	   register-sized pieces.  Large arguments are split between
-	   registers and stack.  */
-	while (len > 0)
-	  {
-	    if (argreg <= LAST_ARGREG)
-	      {
-		int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
-		regval = extract_address (val, partial_len);
-
-		/* It's a simple argument being passed in a general
-		   register.  */
-		write_register (argreg, regval);
-		argreg++;
-		len -= partial_len;
-		val += partial_len;
-	      }
-	    else
-	      {
-		/* keep for later pushing */
-		stack_args[nstack_args].val = val;
-		stack_args[nstack_args++].len = len;
-		break;
-	      }
-	  }
-      }
-    }
-  /* now do the real stack pushing, process args right to left */
-  while (nstack_args--)
-    {
-      sp -= stack_args[nstack_args].len;
-      write_memory (sp, stack_args[nstack_args].val,
-		    stack_args[nstack_args].len);
-    }
-
-  /* Return adjusted stack pointer.  */
-  return sp;
-}
-
-void _initialize_fr30_tdep (void);
-
-void
-_initialize_fr30_tdep (void)
-{
-  extern int print_insn_fr30 (bfd_vma, disassemble_info *);
-  tm_print_insn = print_insn_fr30;
-}
-
-/* Function: check_prologue_cache
-   Check if prologue for this frame's PC has already been scanned.
-   If it has, copy the relevant information about that prologue and
-   return non-zero.  Otherwise do not copy anything and return zero.
-
-   The information saved in the cache includes:
-   * the frame register number;
-   * the size of the stack frame;
-   * the offsets of saved regs (relative to the old SP); and
-   * the offset from the stack pointer to the frame pointer
-
-   The cache contains only one entry, since this is adequate
-   for the typical sequence of prologue scan requests we get.
-   When performing a backtrace, GDB will usually ask to scan
-   the same function twice in a row (once to get the frame chain,
-   and once to fill in the extra frame information).
- */
-
-static struct frame_info prologue_cache;
-
-static int
-check_prologue_cache (struct frame_info *fi)
-{
-  int i;
-
-  if (fi->pc == prologue_cache.pc)
-    {
-      fi->framereg = prologue_cache.framereg;
-      fi->framesize = prologue_cache.framesize;
-      fi->frameoffset = prologue_cache.frameoffset;
-      for (i = 0; i <= NUM_REGS; i++)
-	fi->fsr.regs[i] = prologue_cache.fsr.regs[i];
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-/* Function: save_prologue_cache
-   Copy the prologue information from fi to the prologue cache.
- */
-
-static void
-save_prologue_cache (struct frame_info *fi)
-{
-  int i;
-
-  prologue_cache.pc = fi->pc;
-  prologue_cache.framereg = fi->framereg;
-  prologue_cache.framesize = fi->framesize;
-  prologue_cache.frameoffset = fi->frameoffset;
-
-  for (i = 0; i <= NUM_REGS; i++)
-    {
-      prologue_cache.fsr.regs[i] = fi->fsr.regs[i];
-    }
-}
-
-
-/* Function: scan_prologue
-   Scan the prologue of the function that contains PC, and record what
-   we find in PI.  PI->fsr must be zeroed by the called.  Returns the
-   pc after the prologue.  Note that the addresses saved in pi->fsr
-   are actually just frame relative (negative offsets from the frame
-   pointer).  This is because we don't know the actual value of the
-   frame pointer yet.  In some circumstances, the frame pointer can't
-   be determined till after we have scanned the prologue.  */
-
-static void
-fr30_scan_prologue (struct frame_info *fi)
-{
-  int sp_offset, fp_offset;
-  CORE_ADDR prologue_start, prologue_end, current_pc;
-
-  /* Check if this function is already in the cache of frame information. */
-  if (check_prologue_cache (fi))
-    return;
-
-  /* Assume there is no frame until proven otherwise.  */
-  fi->framereg = SP_REGNUM;
-  fi->framesize = 0;
-  fi->frameoffset = 0;
-
-  /* Find the function prologue.  If we can't find the function in
-     the symbol table, peek in the stack frame to find the PC.  */
-  if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
-    {
-      /* Assume the prologue is everything between the first instruction
-         in the function and the first source line.  */
-      struct symtab_and_line sal = find_pc_line (prologue_start, 0);
-
-      if (sal.line == 0)	/* no line info, use current PC */
-	prologue_end = fi->pc;
-      else if (sal.end < prologue_end)	/* next line begins after fn end */
-	prologue_end = sal.end;	/* (probably means no prologue)  */
-    }
-  else
-    {
-      /* XXX Z.R. What now??? The following is entirely bogus */
-      prologue_start = (read_memory_integer (fi->frame, 4) & 0x03fffffc) - 12;
-      prologue_end = prologue_start + 40;
-    }
-
-  /* Now search the prologue looking for instructions that set up the
-     frame pointer, adjust the stack pointer, and save registers.  */
-
-  sp_offset = fp_offset = 0;
-  for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 2)
-    {
-      unsigned int insn;
-
-      insn = read_memory_unsigned_integer (current_pc, 2);
-
-      if ((insn & 0xfe00) == 0x8e00)	/* stm0 or stm1 */
-	{
-	  int reg, mask = insn & 0xff;
-
-	  /* scan in one sweep - create virtual 16-bit mask from either insn's mask */
-	  if ((insn & 0x0100) == 0)
-	    {
-	      mask <<= 8;	/* stm0 - move to upper byte in virtual mask */
-	    }
-
-	  /* Calculate offsets of saved registers (to be turned later into addresses). */
-	  for (reg = R4_REGNUM; reg <= R11_REGNUM; reg++)
-	    if (mask & (1 << (15 - reg)))
-	      {
-		sp_offset -= 4;
-		fi->fsr.regs[reg] = sp_offset;
-	      }
-	}
-      else if ((insn & 0xfff0) == 0x1700)	/* st rx,@-r15 */
-	{
-	  int reg = insn & 0xf;
-
-	  sp_offset -= 4;
-	  fi->fsr.regs[reg] = sp_offset;
-	}
-      else if ((insn & 0xff00) == 0x0f00)	/* enter */
-	{
-	  fp_offset = fi->fsr.regs[FP_REGNUM] = sp_offset - 4;
-	  sp_offset -= 4 * (insn & 0xff);
-	  fi->framereg = FP_REGNUM;
-	}
-      else if (insn == 0x1781)	/* st rp,@-sp */
-	{
-	  sp_offset -= 4;
-	  fi->fsr.regs[RP_REGNUM] = sp_offset;
-	}
-      else if (insn == 0x170e)	/* st fp,@-sp */
-	{
-	  sp_offset -= 4;
-	  fi->fsr.regs[FP_REGNUM] = sp_offset;
-	}
-      else if (insn == 0x8bfe)	/* mov sp,fp */
-	{
-	  fi->framereg = FP_REGNUM;
-	}
-      else if ((insn & 0xff00) == 0xa300)	/* addsp xx */
-	{
-	  sp_offset += 4 * (signed char) (insn & 0xff);
-	}
-      else if ((insn & 0xff0f) == 0x9b00 &&	/* ldi:20 xx,r0 */
-	       read_memory_unsigned_integer (current_pc + 4, 2)
-	       == 0xac0f)	/* sub r0,sp */
-	{
-	  /* large stack adjustment */
-	  sp_offset -= (((insn & 0xf0) << 12) | read_memory_unsigned_integer (current_pc + 2, 2));
-	  current_pc += 4;
-	}
-      else if (insn == 0x9f80 &&	/* ldi:32 xx,r0 */
-	       read_memory_unsigned_integer (current_pc + 6, 2)
-	       == 0xac0f)	/* sub r0,sp */
-	{
-	  /* large stack adjustment */
-	  sp_offset -=
-	    (read_memory_unsigned_integer (current_pc + 2, 2) << 16 |
-	     read_memory_unsigned_integer (current_pc + 4, 2));
-	  current_pc += 6;
-	}
-    }
-
-  /* The frame size is just the negative of the offset (from the original SP)
-     of the last thing thing we pushed on the stack.  The frame offset is
-     [new FP] - [new SP].  */
-  fi->framesize = -sp_offset;
-  fi->frameoffset = fp_offset - sp_offset;
-
-  save_prologue_cache (fi);
-}
-
-/* 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 scan_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 (since that is derived from fr30_frame_chain ()).
-
-   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
-fr30_init_extra_frame_info (struct frame_info *fi)
-{
-  int reg;
-
-  if (fi->next)
-    fi->pc = FRAME_SAVED_PC (fi->next);
-
-  memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
-
-  if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
-    {
-      /* We need to setup fi->frame here because run_stack_dummy gets it wrong
-         by assuming it's always FP.  */
-      fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
-      fi->framesize = 0;
-      fi->frameoffset = 0;
-      return;
-    }
-  fr30_scan_prologue (fi);
-
-  if (!fi->next)		/* this is the innermost frame? */
-    fi->frame = read_register (fi->framereg);
-  else
-    /* not the innermost frame */
-    /* If we have an FP,  the callee saved it. */
-    if (fi->framereg == FP_REGNUM)
-      if (fi->next->fsr.regs[fi->framereg] != 0)
-	fi->frame = read_memory_integer (fi->next->fsr.regs[fi->framereg], 4);
-
-  /* Calculate actual addresses of saved registers using offsets determined
-     by fr30_scan_prologue.  */
-  for (reg = 0; reg < NUM_REGS; reg++)
-    if (fi->fsr.regs[reg] != 0)
-      {
-	fi->fsr.regs[reg] += fi->frame + fi->framesize - fi->frameoffset;
-      }
-}
-
-/* Function: find_callers_reg
-   Find REGNUM on the stack.  Otherwise, it's in an active register.
-   One thing we might want to do here is to check REGNUM against the
-   clobber mask, and somehow flag it as invalid if it isn't saved on
-   the stack somewhere.  This would provide a graceful failure mode
-   when trying to get the value of caller-saves registers for an inner
-   frame.  */
-
-CORE_ADDR
-fr30_find_callers_reg (struct frame_info *fi, int regnum)
-{
-  for (; fi; fi = fi->next)
-    if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
-      return generic_read_register_dummy (fi->pc, fi->frame, regnum);
-    else if (fi->fsr.regs[regnum] != 0)
-      return read_memory_unsigned_integer (fi->fsr.regs[regnum],
-					   REGISTER_RAW_SIZE (regnum));
-
-  return read_register (regnum);
-}
-
-
-/* Function: frame_chain
-   Figure out the frame prior to FI.  Unfortunately, this involves
-   scanning the prologue of the caller, which will also be done
-   shortly by fr30_init_extra_frame_info.  For the dummy frame, we
-   just return the stack pointer that was in use at the time the
-   function call was made.  */
-
-
-CORE_ADDR
-fr30_frame_chain (struct frame_info *fi)
-{
-  CORE_ADDR fn_start, callers_pc, fp;
-  struct frame_info caller_fi;
-  int framereg;
-
-  /* is this a dummy frame? */
-  if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
-    return fi->frame;		/* dummy frame same as caller's frame */
-
-  /* is caller-of-this a dummy frame? */
-  callers_pc = FRAME_SAVED_PC (fi);	/* find out who called us: */
-  fp = fr30_find_callers_reg (fi, FP_REGNUM);
-  if (PC_IN_CALL_DUMMY (callers_pc, fp, fp))
-    return fp;			/* dummy frame's frame may bear no relation to ours */
-
-  if (find_pc_partial_function (fi->pc, 0, &fn_start, 0))
-    if (fn_start == entry_point_address ())
-      return 0;			/* in _start fn, don't chain further */
-
-  framereg = fi->framereg;
-
-  /* If the caller is the startup code, we're at the end of the chain.  */
-  if (find_pc_partial_function (callers_pc, 0, &fn_start, 0))
-    if (fn_start == entry_point_address ())
-      return 0;
-
-  memset (&caller_fi, 0, sizeof (caller_fi));
-  caller_fi.pc = callers_pc;
-  fr30_scan_prologue (&caller_fi);
-  framereg = caller_fi.framereg;
-
-  /* If the caller used a frame register, return its value.
-     Otherwise, return the caller's stack pointer.  */
-  if (framereg == FP_REGNUM)
-    return fr30_find_callers_reg (fi, framereg);
-  else
-    return fi->frame + fi->framesize;
-}
-
-/* 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
-fr30_frame_saved_pc (struct frame_info *fi)
-{
-  if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
-    return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
-  else
-    return fr30_find_callers_reg (fi, RP_REGNUM);
-}
-
-/* Function: fix_call_dummy
-   Pokes the callee function's address into the CALL_DUMMY assembly stub.
-   Assumes that the CALL_DUMMY looks like this:
-   jarl <offset24>, r31
-   trap
- */
-
-int
-fr30_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs,
-		     struct value **args, struct type *type, int gcc_p)
-{
-  long offset24;
-
-  offset24 = (long) fun - (long) entry_point_address ();
-  offset24 &= 0x3fffff;
-  offset24 |= 0xff800000;	/* jarl <offset24>, r31 */
-
-  store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff);
-  store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16);
-  return 0;
-}
+// OBSOLETE /* Target-dependent code for the Fujitsu FR30.
+// OBSOLETE    Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
+// OBSOLETE 
+// OBSOLETE    This file is part of GDB.
+// OBSOLETE 
+// OBSOLETE    This program is free software; you can redistribute it and/or modify
+// OBSOLETE    it under the terms of the GNU General Public License as published by
+// OBSOLETE    the Free Software Foundation; either version 2 of the License, or
+// OBSOLETE    (at your option) any later version.
+// OBSOLETE 
+// OBSOLETE    This program is distributed in the hope that it will be useful,
+// OBSOLETE    but WITHOUT ANY WARRANTY; without even the implied warranty of
+// OBSOLETE    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// OBSOLETE    GNU General Public License for more details.
+// OBSOLETE 
+// OBSOLETE    You should have received a copy of the GNU General Public License
+// OBSOLETE    along with this program; if not, write to the Free Software
+// OBSOLETE    Foundation, Inc., 59 Temple Place - Suite 330,
+// OBSOLETE    Boston, MA 02111-1307, USA.  */
+// OBSOLETE 
+// OBSOLETE #include "defs.h"
+// OBSOLETE #include "frame.h"
+// OBSOLETE #include "inferior.h"
+// OBSOLETE #include "obstack.h"
+// OBSOLETE #include "target.h"
+// OBSOLETE #include "value.h"
+// OBSOLETE #include "bfd.h"
+// OBSOLETE #include "gdb_string.h"
+// OBSOLETE #include "gdbcore.h"
+// OBSOLETE #include "symfile.h"
+// OBSOLETE #include "regcache.h"
+// OBSOLETE 
+// OBSOLETE /* An expression that tells us whether the function invocation represented
+// OBSOLETE    by FI does not have a frame on the stack associated with it.  */
+// OBSOLETE int
+// OBSOLETE fr30_frameless_function_invocation (struct frame_info *fi)
+// OBSOLETE {
+// OBSOLETE   int frameless;
+// OBSOLETE   CORE_ADDR func_start, after_prologue;
+// OBSOLETE   func_start = (get_pc_function_start ((fi)->pc) +
+// OBSOLETE 		FUNCTION_START_OFFSET);
+// OBSOLETE   after_prologue = func_start;
+// OBSOLETE   after_prologue = SKIP_PROLOGUE (after_prologue);
+// OBSOLETE   frameless = (after_prologue == func_start);
+// OBSOLETE   return frameless;
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE /* Function: pop_frame
+// OBSOLETE    This routine gets called when either the user uses the `return'
+// OBSOLETE    command, or the call dummy breakpoint gets hit.  */
+// OBSOLETE 
+// OBSOLETE void
+// OBSOLETE fr30_pop_frame (void)
+// OBSOLETE {
+// OBSOLETE   struct frame_info *frame = get_current_frame ();
+// OBSOLETE   int regnum;
+// OBSOLETE   CORE_ADDR sp = read_register (SP_REGNUM);
+// OBSOLETE 
+// OBSOLETE   if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+// OBSOLETE     generic_pop_dummy_frame ();
+// OBSOLETE   else
+// OBSOLETE     {
+// OBSOLETE       write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+// OBSOLETE 
+// OBSOLETE       for (regnum = 0; regnum < NUM_REGS; regnum++)
+// OBSOLETE 	if (frame->fsr.regs[regnum] != 0)
+// OBSOLETE 	  {
+// OBSOLETE 	    write_register (regnum,
+// OBSOLETE 		      read_memory_unsigned_integer (frame->fsr.regs[regnum],
+// OBSOLETE 					       REGISTER_RAW_SIZE (regnum)));
+// OBSOLETE 	  }
+// OBSOLETE       write_register (SP_REGNUM, sp + frame->framesize);
+// OBSOLETE     }
+// OBSOLETE   flush_cached_frames ();
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE 
+// OBSOLETE /* Function: fr30_store_return_value
+// OBSOLETE    Put a value where a caller expects to see it.  Used by the 'return'
+// OBSOLETE    command.  */
+// OBSOLETE void
+// OBSOLETE fr30_store_return_value (struct type *type,
+// OBSOLETE 			 char *valbuf)
+// OBSOLETE {
+// OBSOLETE   /* Here's how the FR30 returns values (gleaned from gcc/config/
+// OBSOLETE      fr30/fr30.h):
+// OBSOLETE 
+// OBSOLETE      If the return value is 32 bits long or less, it goes in r4.
+// OBSOLETE 
+// OBSOLETE      If the return value is 64 bits long or less, it goes in r4 (most
+// OBSOLETE      significant word) and r5 (least significant word.
+// OBSOLETE 
+// OBSOLETE      If the function returns a structure, of any size, the caller
+// OBSOLETE      passes the function an invisible first argument where the callee
+// OBSOLETE      should store the value.  But GDB doesn't let you do that anyway.
+// OBSOLETE 
+// OBSOLETE      If you're returning a value smaller than a word, it's not really
+// OBSOLETE      necessary to zero the upper bytes of the register; the caller is
+// OBSOLETE      supposed to ignore them.  However, the FR30 typically keeps its
+// OBSOLETE      values extended to the full register width, so we should emulate
+// OBSOLETE      that.  */
+// OBSOLETE 
+// OBSOLETE   /* The FR30 is big-endian, so if we return a small value (like a
+// OBSOLETE      short or a char), we need to position it correctly within the
+// OBSOLETE      register.  We round the size up to a register boundary, and then
+// OBSOLETE      adjust the offset so as to place the value at the right end.  */
+// OBSOLETE   int value_size = TYPE_LENGTH (type);
+// OBSOLETE   int returned_size = (value_size + FR30_REGSIZE - 1) & ~(FR30_REGSIZE - 1);
+// OBSOLETE   int offset = (REGISTER_BYTE (RETVAL_REG)
+// OBSOLETE 		+ (returned_size - value_size));
+// OBSOLETE   char *zeros = alloca (returned_size);
+// OBSOLETE   memset (zeros, 0, returned_size);
+// OBSOLETE 
+// OBSOLETE   write_register_bytes (REGISTER_BYTE (RETVAL_REG), zeros, returned_size);
+// OBSOLETE   write_register_bytes (offset, valbuf, value_size);
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE 
+// OBSOLETE /* Function: skip_prologue
+// OBSOLETE    Return the address of the first code past the prologue of the function.  */
+// OBSOLETE 
+// OBSOLETE CORE_ADDR
+// OBSOLETE fr30_skip_prologue (CORE_ADDR pc)
+// OBSOLETE {
+// OBSOLETE   CORE_ADDR func_addr, func_end;
+// OBSOLETE 
+// OBSOLETE   /* See what the symbol table says */
+// OBSOLETE 
+// OBSOLETE   if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+// OBSOLETE     {
+// OBSOLETE       struct symtab_and_line sal;
+// OBSOLETE 
+// OBSOLETE       sal = find_pc_line (func_addr, 0);
+// OBSOLETE 
+// OBSOLETE       if (sal.line != 0 && sal.end < func_end)
+// OBSOLETE 	{
+// OBSOLETE 	  return sal.end;
+// OBSOLETE 	}
+// OBSOLETE     }
+// OBSOLETE 
+// OBSOLETE /* Either we didn't find the start of this function (nothing we can do),
+// OBSOLETE    or there's no line info, or the line after the prologue is after
+// OBSOLETE    the end of the function (there probably isn't a prologue). */
+// OBSOLETE 
+// OBSOLETE   return pc;
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE 
+// OBSOLETE /* Function: push_arguments
+// OBSOLETE    Setup arguments and RP for a call to the target.  First four args
+// OBSOLETE    go in FIRST_ARGREG -> LAST_ARGREG, subsequent args go on stack...
+// OBSOLETE    Structs are passed by reference.  XXX not right now Z.R.
+// OBSOLETE    64 bit quantities (doubles and long longs) may be split between
+// OBSOLETE    the regs and the stack.
+// OBSOLETE    When calling a function that returns a struct, a pointer to the struct
+// OBSOLETE    is passed in as a secret first argument (always in FIRST_ARGREG).
+// OBSOLETE 
+// OBSOLETE    Stack space for the args has NOT been allocated: that job is up to us.
+// OBSOLETE  */
+// OBSOLETE 
+// OBSOLETE CORE_ADDR
+// OBSOLETE fr30_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
+// OBSOLETE 		     int struct_return, CORE_ADDR struct_addr)
+// OBSOLETE {
+// OBSOLETE   int argreg;
+// OBSOLETE   int argnum;
+// OBSOLETE   int stack_offset;
+// OBSOLETE   struct stack_arg
+// OBSOLETE     {
+// OBSOLETE       char *val;
+// OBSOLETE       int len;
+// OBSOLETE       int offset;
+// OBSOLETE     };
+// OBSOLETE   struct stack_arg *stack_args =
+// OBSOLETE   (struct stack_arg *) alloca (nargs * sizeof (struct stack_arg));
+// OBSOLETE   int nstack_args = 0;
+// OBSOLETE 
+// OBSOLETE   argreg = FIRST_ARGREG;
+// OBSOLETE 
+// OBSOLETE   /* the struct_return pointer occupies the first parameter-passing reg */
+// OBSOLETE   if (struct_return)
+// OBSOLETE     write_register (argreg++, struct_addr);
+// OBSOLETE 
+// OBSOLETE   stack_offset = 0;
+// OBSOLETE 
+// OBSOLETE   /* Process args from left to right.  Store as many as allowed in
+// OBSOLETE      registers, save the rest to be pushed on the stack */
+// OBSOLETE   for (argnum = 0; argnum < nargs; argnum++)
+// OBSOLETE     {
+// OBSOLETE       char *val;
+// OBSOLETE       struct value *arg = args[argnum];
+// OBSOLETE       struct type *arg_type = check_typedef (VALUE_TYPE (arg));
+// OBSOLETE       struct type *target_type = TYPE_TARGET_TYPE (arg_type);
+// OBSOLETE       int len = TYPE_LENGTH (arg_type);
+// OBSOLETE       enum type_code typecode = TYPE_CODE (arg_type);
+// OBSOLETE       CORE_ADDR regval;
+// OBSOLETE       int newarg;
+// OBSOLETE 
+// OBSOLETE       val = (char *) VALUE_CONTENTS (arg);
+// OBSOLETE 
+// OBSOLETE       {
+// OBSOLETE 	/* Copy the argument to general registers or the stack in
+// OBSOLETE 	   register-sized pieces.  Large arguments are split between
+// OBSOLETE 	   registers and stack.  */
+// OBSOLETE 	while (len > 0)
+// OBSOLETE 	  {
+// OBSOLETE 	    if (argreg <= LAST_ARGREG)
+// OBSOLETE 	      {
+// OBSOLETE 		int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
+// OBSOLETE 		regval = extract_address (val, partial_len);
+// OBSOLETE 
+// OBSOLETE 		/* It's a simple argument being passed in a general
+// OBSOLETE 		   register.  */
+// OBSOLETE 		write_register (argreg, regval);
+// OBSOLETE 		argreg++;
+// OBSOLETE 		len -= partial_len;
+// OBSOLETE 		val += partial_len;
+// OBSOLETE 	      }
+// OBSOLETE 	    else
+// OBSOLETE 	      {
+// OBSOLETE 		/* keep for later pushing */
+// OBSOLETE 		stack_args[nstack_args].val = val;
+// OBSOLETE 		stack_args[nstack_args++].len = len;
+// OBSOLETE 		break;
+// OBSOLETE 	      }
+// OBSOLETE 	  }
+// OBSOLETE       }
+// OBSOLETE     }
+// OBSOLETE   /* now do the real stack pushing, process args right to left */
+// OBSOLETE   while (nstack_args--)
+// OBSOLETE     {
+// OBSOLETE       sp -= stack_args[nstack_args].len;
+// OBSOLETE       write_memory (sp, stack_args[nstack_args].val,
+// OBSOLETE 		    stack_args[nstack_args].len);
+// OBSOLETE     }
+// OBSOLETE 
+// OBSOLETE   /* Return adjusted stack pointer.  */
+// OBSOLETE   return sp;
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE void _initialize_fr30_tdep (void);
+// OBSOLETE 
+// OBSOLETE void
+// OBSOLETE _initialize_fr30_tdep (void)
+// OBSOLETE {
+// OBSOLETE   extern int print_insn_fr30 (bfd_vma, disassemble_info *);
+// OBSOLETE   tm_print_insn = print_insn_fr30;
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE /* Function: check_prologue_cache
+// OBSOLETE    Check if prologue for this frame's PC has already been scanned.
+// OBSOLETE    If it has, copy the relevant information about that prologue and
+// OBSOLETE    return non-zero.  Otherwise do not copy anything and return zero.
+// OBSOLETE 
+// OBSOLETE    The information saved in the cache includes:
+// OBSOLETE    * the frame register number;
+// OBSOLETE    * the size of the stack frame;
+// OBSOLETE    * the offsets of saved regs (relative to the old SP); and
+// OBSOLETE    * the offset from the stack pointer to the frame pointer
+// OBSOLETE 
+// OBSOLETE    The cache contains only one entry, since this is adequate
+// OBSOLETE    for the typical sequence of prologue scan requests we get.
+// OBSOLETE    When performing a backtrace, GDB will usually ask to scan
+// OBSOLETE    the same function twice in a row (once to get the frame chain,
+// OBSOLETE    and once to fill in the extra frame information).
+// OBSOLETE  */
+// OBSOLETE 
+// OBSOLETE static struct frame_info prologue_cache;
+// OBSOLETE 
+// OBSOLETE static int
+// OBSOLETE check_prologue_cache (struct frame_info *fi)
+// OBSOLETE {
+// OBSOLETE   int i;
+// OBSOLETE 
+// OBSOLETE   if (fi->pc == prologue_cache.pc)
+// OBSOLETE     {
+// OBSOLETE       fi->framereg = prologue_cache.framereg;
+// OBSOLETE       fi->framesize = prologue_cache.framesize;
+// OBSOLETE       fi->frameoffset = prologue_cache.frameoffset;
+// OBSOLETE       for (i = 0; i <= NUM_REGS; i++)
+// OBSOLETE 	fi->fsr.regs[i] = prologue_cache.fsr.regs[i];
+// OBSOLETE       return 1;
+// OBSOLETE     }
+// OBSOLETE   else
+// OBSOLETE     return 0;
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE 
+// OBSOLETE /* Function: save_prologue_cache
+// OBSOLETE    Copy the prologue information from fi to the prologue cache.
+// OBSOLETE  */
+// OBSOLETE 
+// OBSOLETE static void
+// OBSOLETE save_prologue_cache (struct frame_info *fi)
+// OBSOLETE {
+// OBSOLETE   int i;
+// OBSOLETE 
+// OBSOLETE   prologue_cache.pc = fi->pc;
+// OBSOLETE   prologue_cache.framereg = fi->framereg;
+// OBSOLETE   prologue_cache.framesize = fi->framesize;
+// OBSOLETE   prologue_cache.frameoffset = fi->frameoffset;
+// OBSOLETE 
+// OBSOLETE   for (i = 0; i <= NUM_REGS; i++)
+// OBSOLETE     {
+// OBSOLETE       prologue_cache.fsr.regs[i] = fi->fsr.regs[i];
+// OBSOLETE     }
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE 
+// OBSOLETE /* Function: scan_prologue
+// OBSOLETE    Scan the prologue of the function that contains PC, and record what
+// OBSOLETE    we find in PI.  PI->fsr must be zeroed by the called.  Returns the
+// OBSOLETE    pc after the prologue.  Note that the addresses saved in pi->fsr
+// OBSOLETE    are actually just frame relative (negative offsets from the frame
+// OBSOLETE    pointer).  This is because we don't know the actual value of the
+// OBSOLETE    frame pointer yet.  In some circumstances, the frame pointer can't
+// OBSOLETE    be determined till after we have scanned the prologue.  */
+// OBSOLETE 
+// OBSOLETE static void
+// OBSOLETE fr30_scan_prologue (struct frame_info *fi)
+// OBSOLETE {
+// OBSOLETE   int sp_offset, fp_offset;
+// OBSOLETE   CORE_ADDR prologue_start, prologue_end, current_pc;
+// OBSOLETE 
+// OBSOLETE   /* Check if this function is already in the cache of frame information. */
+// OBSOLETE   if (check_prologue_cache (fi))
+// OBSOLETE     return;
+// OBSOLETE 
+// OBSOLETE   /* Assume there is no frame until proven otherwise.  */
+// OBSOLETE   fi->framereg = SP_REGNUM;
+// OBSOLETE   fi->framesize = 0;
+// OBSOLETE   fi->frameoffset = 0;
+// OBSOLETE 
+// OBSOLETE   /* Find the function prologue.  If we can't find the function in
+// OBSOLETE      the symbol table, peek in the stack frame to find the PC.  */
+// OBSOLETE   if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
+// OBSOLETE     {
+// OBSOLETE       /* Assume the prologue is everything between the first instruction
+// OBSOLETE          in the function and the first source line.  */
+// OBSOLETE       struct symtab_and_line sal = find_pc_line (prologue_start, 0);
+// OBSOLETE 
+// OBSOLETE       if (sal.line == 0)	/* no line info, use current PC */
+// OBSOLETE 	prologue_end = fi->pc;
+// OBSOLETE       else if (sal.end < prologue_end)	/* next line begins after fn end */
+// OBSOLETE 	prologue_end = sal.end;	/* (probably means no prologue)  */
+// OBSOLETE     }
+// OBSOLETE   else
+// OBSOLETE     {
+// OBSOLETE       /* XXX Z.R. What now??? The following is entirely bogus */
+// OBSOLETE       prologue_start = (read_memory_integer (fi->frame, 4) & 0x03fffffc) - 12;
+// OBSOLETE       prologue_end = prologue_start + 40;
+// OBSOLETE     }
+// OBSOLETE 
+// OBSOLETE   /* Now search the prologue looking for instructions that set up the
+// OBSOLETE      frame pointer, adjust the stack pointer, and save registers.  */
+// OBSOLETE 
+// OBSOLETE   sp_offset = fp_offset = 0;
+// OBSOLETE   for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 2)
+// OBSOLETE     {
+// OBSOLETE       unsigned int insn;
+// OBSOLETE 
+// OBSOLETE       insn = read_memory_unsigned_integer (current_pc, 2);
+// OBSOLETE 
+// OBSOLETE       if ((insn & 0xfe00) == 0x8e00)	/* stm0 or stm1 */
+// OBSOLETE 	{
+// OBSOLETE 	  int reg, mask = insn & 0xff;
+// OBSOLETE 
+// OBSOLETE 	  /* scan in one sweep - create virtual 16-bit mask from either insn's mask */
+// OBSOLETE 	  if ((insn & 0x0100) == 0)
+// OBSOLETE 	    {
+// OBSOLETE 	      mask <<= 8;	/* stm0 - move to upper byte in virtual mask */
+// OBSOLETE 	    }
+// OBSOLETE 
+// OBSOLETE 	  /* Calculate offsets of saved registers (to be turned later into addresses). */
+// OBSOLETE 	  for (reg = R4_REGNUM; reg <= R11_REGNUM; reg++)
+// OBSOLETE 	    if (mask & (1 << (15 - reg)))
+// OBSOLETE 	      {
+// OBSOLETE 		sp_offset -= 4;
+// OBSOLETE 		fi->fsr.regs[reg] = sp_offset;
+// OBSOLETE 	      }
+// OBSOLETE 	}
+// OBSOLETE       else if ((insn & 0xfff0) == 0x1700)	/* st rx,@-r15 */
+// OBSOLETE 	{
+// OBSOLETE 	  int reg = insn & 0xf;
+// OBSOLETE 
+// OBSOLETE 	  sp_offset -= 4;
+// OBSOLETE 	  fi->fsr.regs[reg] = sp_offset;
+// OBSOLETE 	}
+// OBSOLETE       else if ((insn & 0xff00) == 0x0f00)	/* enter */
+// OBSOLETE 	{
+// OBSOLETE 	  fp_offset = fi->fsr.regs[FP_REGNUM] = sp_offset - 4;
+// OBSOLETE 	  sp_offset -= 4 * (insn & 0xff);
+// OBSOLETE 	  fi->framereg = FP_REGNUM;
+// OBSOLETE 	}
+// OBSOLETE       else if (insn == 0x1781)	/* st rp,@-sp */
+// OBSOLETE 	{
+// OBSOLETE 	  sp_offset -= 4;
+// OBSOLETE 	  fi->fsr.regs[RP_REGNUM] = sp_offset;
+// OBSOLETE 	}
+// OBSOLETE       else if (insn == 0x170e)	/* st fp,@-sp */
+// OBSOLETE 	{
+// OBSOLETE 	  sp_offset -= 4;
+// OBSOLETE 	  fi->fsr.regs[FP_REGNUM] = sp_offset;
+// OBSOLETE 	}
+// OBSOLETE       else if (insn == 0x8bfe)	/* mov sp,fp */
+// OBSOLETE 	{
+// OBSOLETE 	  fi->framereg = FP_REGNUM;
+// OBSOLETE 	}
+// OBSOLETE       else if ((insn & 0xff00) == 0xa300)	/* addsp xx */
+// OBSOLETE 	{
+// OBSOLETE 	  sp_offset += 4 * (signed char) (insn & 0xff);
+// OBSOLETE 	}
+// OBSOLETE       else if ((insn & 0xff0f) == 0x9b00 &&	/* ldi:20 xx,r0 */
+// OBSOLETE 	       read_memory_unsigned_integer (current_pc + 4, 2)
+// OBSOLETE 	       == 0xac0f)	/* sub r0,sp */
+// OBSOLETE 	{
+// OBSOLETE 	  /* large stack adjustment */
+// OBSOLETE 	  sp_offset -= (((insn & 0xf0) << 12) | read_memory_unsigned_integer (current_pc + 2, 2));
+// OBSOLETE 	  current_pc += 4;
+// OBSOLETE 	}
+// OBSOLETE       else if (insn == 0x9f80 &&	/* ldi:32 xx,r0 */
+// OBSOLETE 	       read_memory_unsigned_integer (current_pc + 6, 2)
+// OBSOLETE 	       == 0xac0f)	/* sub r0,sp */
+// OBSOLETE 	{
+// OBSOLETE 	  /* large stack adjustment */
+// OBSOLETE 	  sp_offset -=
+// OBSOLETE 	    (read_memory_unsigned_integer (current_pc + 2, 2) << 16 |
+// OBSOLETE 	     read_memory_unsigned_integer (current_pc + 4, 2));
+// OBSOLETE 	  current_pc += 6;
+// OBSOLETE 	}
+// OBSOLETE     }
+// OBSOLETE 
+// OBSOLETE   /* The frame size is just the negative of the offset (from the original SP)
+// OBSOLETE      of the last thing thing we pushed on the stack.  The frame offset is
+// OBSOLETE      [new FP] - [new SP].  */
+// OBSOLETE   fi->framesize = -sp_offset;
+// OBSOLETE   fi->frameoffset = fp_offset - sp_offset;
+// OBSOLETE 
+// OBSOLETE   save_prologue_cache (fi);
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE /* Function: init_extra_frame_info
+// OBSOLETE    Setup the frame's frame pointer, pc, and frame addresses for saved
+// OBSOLETE    registers.  Most of the work is done in scan_prologue().
+// OBSOLETE 
+// OBSOLETE    Note that when we are called for the last frame (currently active frame),
+// OBSOLETE    that fi->pc and fi->frame will already be setup.  However, fi->frame will
+// OBSOLETE    be valid only if this routine uses FP.  For previous frames, fi-frame will
+// OBSOLETE    always be correct (since that is derived from fr30_frame_chain ()).
+// OBSOLETE 
+// OBSOLETE    We can be called with the PC in the call dummy under two circumstances.
+// OBSOLETE    First, during normal backtracing, second, while figuring out the frame
+// OBSOLETE    pointer just prior to calling the target function (see run_stack_dummy).  */
+// OBSOLETE 
+// OBSOLETE void
+// OBSOLETE fr30_init_extra_frame_info (struct frame_info *fi)
+// OBSOLETE {
+// OBSOLETE   int reg;
+// OBSOLETE 
+// OBSOLETE   if (fi->next)
+// OBSOLETE     fi->pc = FRAME_SAVED_PC (fi->next);
+// OBSOLETE 
+// OBSOLETE   memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
+// OBSOLETE 
+// OBSOLETE   if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+// OBSOLETE     {
+// OBSOLETE       /* We need to setup fi->frame here because run_stack_dummy gets it wrong
+// OBSOLETE          by assuming it's always FP.  */
+// OBSOLETE       fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
+// OBSOLETE       fi->framesize = 0;
+// OBSOLETE       fi->frameoffset = 0;
+// OBSOLETE       return;
+// OBSOLETE     }
+// OBSOLETE   fr30_scan_prologue (fi);
+// OBSOLETE 
+// OBSOLETE   if (!fi->next)		/* this is the innermost frame? */
+// OBSOLETE     fi->frame = read_register (fi->framereg);
+// OBSOLETE   else
+// OBSOLETE     /* not the innermost frame */
+// OBSOLETE     /* If we have an FP,  the callee saved it. */
+// OBSOLETE     if (fi->framereg == FP_REGNUM)
+// OBSOLETE       if (fi->next->fsr.regs[fi->framereg] != 0)
+// OBSOLETE 	fi->frame = read_memory_integer (fi->next->fsr.regs[fi->framereg], 4);
+// OBSOLETE 
+// OBSOLETE   /* Calculate actual addresses of saved registers using offsets determined
+// OBSOLETE      by fr30_scan_prologue.  */
+// OBSOLETE   for (reg = 0; reg < NUM_REGS; reg++)
+// OBSOLETE     if (fi->fsr.regs[reg] != 0)
+// OBSOLETE       {
+// OBSOLETE 	fi->fsr.regs[reg] += fi->frame + fi->framesize - fi->frameoffset;
+// OBSOLETE       }
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE /* Function: find_callers_reg
+// OBSOLETE    Find REGNUM on the stack.  Otherwise, it's in an active register.
+// OBSOLETE    One thing we might want to do here is to check REGNUM against the
+// OBSOLETE    clobber mask, and somehow flag it as invalid if it isn't saved on
+// OBSOLETE    the stack somewhere.  This would provide a graceful failure mode
+// OBSOLETE    when trying to get the value of caller-saves registers for an inner
+// OBSOLETE    frame.  */
+// OBSOLETE 
+// OBSOLETE CORE_ADDR
+// OBSOLETE fr30_find_callers_reg (struct frame_info *fi, int regnum)
+// OBSOLETE {
+// OBSOLETE   for (; fi; fi = fi->next)
+// OBSOLETE     if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+// OBSOLETE       return generic_read_register_dummy (fi->pc, fi->frame, regnum);
+// OBSOLETE     else if (fi->fsr.regs[regnum] != 0)
+// OBSOLETE       return read_memory_unsigned_integer (fi->fsr.regs[regnum],
+// OBSOLETE 					   REGISTER_RAW_SIZE (regnum));
+// OBSOLETE 
+// OBSOLETE   return read_register (regnum);
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE 
+// OBSOLETE /* Function: frame_chain
+// OBSOLETE    Figure out the frame prior to FI.  Unfortunately, this involves
+// OBSOLETE    scanning the prologue of the caller, which will also be done
+// OBSOLETE    shortly by fr30_init_extra_frame_info.  For the dummy frame, we
+// OBSOLETE    just return the stack pointer that was in use at the time the
+// OBSOLETE    function call was made.  */
+// OBSOLETE 
+// OBSOLETE 
+// OBSOLETE CORE_ADDR
+// OBSOLETE fr30_frame_chain (struct frame_info *fi)
+// OBSOLETE {
+// OBSOLETE   CORE_ADDR fn_start, callers_pc, fp;
+// OBSOLETE   struct frame_info caller_fi;
+// OBSOLETE   int framereg;
+// OBSOLETE 
+// OBSOLETE   /* is this a dummy frame? */
+// OBSOLETE   if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+// OBSOLETE     return fi->frame;		/* dummy frame same as caller's frame */
+// OBSOLETE 
+// OBSOLETE   /* is caller-of-this a dummy frame? */
+// OBSOLETE   callers_pc = FRAME_SAVED_PC (fi);	/* find out who called us: */
+// OBSOLETE   fp = fr30_find_callers_reg (fi, FP_REGNUM);
+// OBSOLETE   if (PC_IN_CALL_DUMMY (callers_pc, fp, fp))
+// OBSOLETE     return fp;			/* dummy frame's frame may bear no relation to ours */
+// OBSOLETE 
+// OBSOLETE   if (find_pc_partial_function (fi->pc, 0, &fn_start, 0))
+// OBSOLETE     if (fn_start == entry_point_address ())
+// OBSOLETE       return 0;			/* in _start fn, don't chain further */
+// OBSOLETE 
+// OBSOLETE   framereg = fi->framereg;
+// OBSOLETE 
+// OBSOLETE   /* If the caller is the startup code, we're at the end of the chain.  */
+// OBSOLETE   if (find_pc_partial_function (callers_pc, 0, &fn_start, 0))
+// OBSOLETE     if (fn_start == entry_point_address ())
+// OBSOLETE       return 0;
+// OBSOLETE 
+// OBSOLETE   memset (&caller_fi, 0, sizeof (caller_fi));
+// OBSOLETE   caller_fi.pc = callers_pc;
+// OBSOLETE   fr30_scan_prologue (&caller_fi);
+// OBSOLETE   framereg = caller_fi.framereg;
+// OBSOLETE 
+// OBSOLETE   /* If the caller used a frame register, return its value.
+// OBSOLETE      Otherwise, return the caller's stack pointer.  */
+// OBSOLETE   if (framereg == FP_REGNUM)
+// OBSOLETE     return fr30_find_callers_reg (fi, framereg);
+// OBSOLETE   else
+// OBSOLETE     return fi->frame + fi->framesize;
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE /* Function: frame_saved_pc 
+// OBSOLETE    Find the caller of this frame.  We do this by seeing if RP_REGNUM
+// OBSOLETE    is saved in the stack anywhere, otherwise we get it from the
+// OBSOLETE    registers.  If the inner frame is a dummy frame, return its PC
+// OBSOLETE    instead of RP, because that's where "caller" of the dummy-frame
+// OBSOLETE    will be found.  */
+// OBSOLETE 
+// OBSOLETE CORE_ADDR
+// OBSOLETE fr30_frame_saved_pc (struct frame_info *fi)
+// OBSOLETE {
+// OBSOLETE   if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+// OBSOLETE     return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
+// OBSOLETE   else
+// OBSOLETE     return fr30_find_callers_reg (fi, RP_REGNUM);
+// OBSOLETE }
+// OBSOLETE 
+// OBSOLETE /* Function: fix_call_dummy
+// OBSOLETE    Pokes the callee function's address into the CALL_DUMMY assembly stub.
+// OBSOLETE    Assumes that the CALL_DUMMY looks like this:
+// OBSOLETE    jarl <offset24>, r31
+// OBSOLETE    trap
+// OBSOLETE  */
+// OBSOLETE 
+// OBSOLETE int
+// OBSOLETE fr30_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs,
+// OBSOLETE 		     struct value **args, struct type *type, int gcc_p)
+// OBSOLETE {
+// OBSOLETE   long offset24;
+// OBSOLETE 
+// OBSOLETE   offset24 = (long) fun - (long) entry_point_address ();
+// OBSOLETE   offset24 &= 0x3fffff;
+// OBSOLETE   offset24 |= 0xff800000;	/* jarl <offset24>, r31 */
+// OBSOLETE 
+// OBSOLETE   store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff);
+// OBSOLETE   store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16);
+// OBSOLETE   return 0;
+// OBSOLETE }