[Patch 1/7]: 68HC11 port of gdb (gdb)

Stephane Carrez Stephane.Carrez@free.fr
Sun Jun 25 13:34:00 GMT 2000


Hi!

Here are the patches for the support of 68HC11 in gdb.

I've split the patches in several parts:

 [1] - gdb/gdb which is the support for 68hc11 in gdb
 [2] - gdb/sim/m68hc11 which is the simulator (based on sim framework)

Then, I have several improvements and fixes of the simulator framework:

 [3] - 16-bit support in the framework
 [4] - New functions for event framework to know the time that remains
 [5] - Overlapping of address maps
 [6] - Misc fixes, sim_resume single step fix

Can you integrate these patches?

Thanks,
	Stephane

Here is the ChangeLog for gdb/ChangeLog.

2000-06-25  Stephane Carrez  <Stephane.Carrez@worldnet.fr>

	* configure.tgt: Recognize the 68hc11.
	* m68hc11-tdep.c: New file for 68hc11 target.
	* config/m68hc11/tm-m68hc11.h: New file for definition of 68hc11
	target.
	* config/m68hc11/m68hc11.mt: New file for 68hc11 port.
diff -Nrup --exclude-from=gdb-exclude.lst /src/gnu/cygnus/gdb/gdb/config/m68hc11/m68hc11.mt gdb/gdb/config/m68hc11/m68hc11.mt
--- /src/gnu/cygnus/gdb/gdb/config/m68hc11/m68hc11.mt	Thu Jan  1 01:00:00 1970
+++ gdb/gdb/config/m68hc11/m68hc11.mt	Mon Feb 21 09:00:22 2000
@@ -0,0 +1,6 @@
+# Target: Motorola 68HC11 processor
+TDEPFILES= m68hc11-tdep.o
+TM_FILE= tm-m68hc11.h
+SIM_OBS= remote-sim.o
+SIM= ../sim/m68hc11/libsim.a -lm
+
diff -Nrup --exclude-from=gdb-exclude.lst /src/gnu/cygnus/gdb/gdb/config/m68hc11/tm-m68hc11.h gdb/gdb/config/m68hc11/tm-m68hc11.h
--- /src/gnu/cygnus/gdb/gdb/config/m68hc11/tm-m68hc11.h	Thu Jan  1 01:00:00 1970
+++ gdb/gdb/config/m68hc11/tm-m68hc11.h	Wed Jun 21 10:33:06 2000
@@ -0,0 +1,254 @@
+/* Target-specific definition for the Motorola 68HC11
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+   Contributed by Stephane Carrez, stcarrez@worldnet.fr
+
+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.  */
+
+
+#define GDB_TARGET_IS_M6811
+
+/* Define the bit, byte, and word ordering of the machine.  */
+
+#define TARGET_BYTE_ORDER	BIG_ENDIAN
+
+/* Offset from address of function to start of its code.
+   Zero on most machines.  */
+
+#define FUNCTION_START_OFFSET 0
+
+#ifdef __STDC__			/* Forward decls for prototypes */
+struct frame_info;
+struct frame_saved_regs;
+struct type;
+struct value;
+#endif
+
+/* Advance PC across any function entry prologue instructions
+   to reach some "real" code.  */
+
+extern CORE_ADDR m68hc11_skip_prologue ();
+#define SKIP_PROLOGUE(ip) \
+    m68hc11_skip_prologue (ip)
+
+
+/* Stack grows downward.  */
+
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
+
+/* For a breakpoint, use "test".  This is also the breakpoint
+   instruction on the 68HC12.  */
+#define BREAKPOINT {0x0}
+
+/* If your kernel resets the pc after the trap happens you may need to
+   define this before including this file.  */
+#define DECR_PC_AFTER_BREAK 0
+
+extern char *m68hc11_register_names[];
+#define REGISTER_NAME(i) m68hc11_register_names[i]
+
+#define REGISTER_SIZE   2
+
+/* Register numbers of various important registers.
+   Note that some of these values are "real" register numbers,
+   and correspond to the general registers of the machine,
+   and some are "phony" register numbers which are too large
+   to be actual register numbers as far as the user is concerned
+   but do serve to get the desired values when passed to read_register.  */
+
+#define X_REGNUM 	0
+#define D_REGNUM	1
+#define Y_REGNUM        2
+#define SP_REGNUM 	3
+#define PC_REGNUM 	4
+#define A_REGNUM        5
+#define B_REGNUM        6
+#define PSW_REGNUM 	7
+#define Z_REGNUM        8
+#define FP_REGNUM       9
+#define TMP_REGNUM     10
+#define ZS_REGNUM      11
+#define XY_REGNUM      12
+#define ZD1_REGNUM     13
+#define ZD32_REGNUM    (ZD1_REGNUM+31)
+
+#define NUM_REGS       (ZD32_REGNUM+1)
+
+#include "opcode/m68hc11.h"
+
+/* Say how much memory is needed to store a copy of the register set */
+#define REGISTER_BYTES    ((NUM_REGS)*2)
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#define REGISTER_BYTE(N)  ((N) * 2)
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  */
+
+#define REGISTER_RAW_SIZE(N) (2)
+
+/* Number of bytes of storage in the program's representation
+   for register N.  */
+
+#define REGISTER_VIRTUAL_SIZE(N) (2)
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE 8
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
+
+#define MAX_REGISTER_VIRTUAL_SIZE 8
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) builtin_type_uint16
+
+/* Store the address of the place in which to copy the structure the
+   subroutine will return.  This is called from call_function. 
+
+   We store structs through a pointer passed in D */
+
+#define STORE_STRUCT_RETURN(ADDR, SP) \
+    { write_register (D_REGNUM, (ADDR));  }
+
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  
+
+   Things always get returned in D/X */
+
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+  write_register_bytes (REGISTER_BYTE (D_REGNUM), VALBUF, TYPE_LENGTH (TYPE))
+
+
+/* Extract from an array REGBUF containing the (raw) register state
+   the address in which a function should return its structure value,
+   as a CORE_ADDR (or an expression that can be used as one).  */
+
+#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
+
+
+/* Define other aspects of the stack frame. 
+   we keep a copy of the worked out return pc lying around, since it
+   is a useful bit of info */
+
+#define EXTRA_FRAME_INFO \
+    int frame_reg; \
+    CORE_ADDR return_pc; \
+    CORE_ADDR dummy; \
+    int frameless; \
+    int size;
+
+/* There's a mess in stack frame creation.  See comments in blockframe.c
+   near reference to INIT_FRAME_PC_FIRST.  */
+
+#define	INIT_FRAME_PC(fromleaf, prev)	/* nada */
+
+#define INIT_FRAME_PC_FIRST(fromleaf, prev) \
+  (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
+	      (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
+
+#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
+    m68hc11_init_extra_frame_info (fromleaf, fi)
+
+extern void m68hc11_init_extra_frame_info (int fromleaf,
+                                           struct frame_info * fi);
+
+/* A macro that tells us whether the function invocation represented
+   by FI does not have a frame on the stack associated with it.  If it
+   does not, FRAMELESS is set to 1, else 0.  */
+
+#define FRAMELESS_FUNCTION_INVOCATION(FI) \
+  frameless_look_for_prologue (FI)
+
+#define FRAME_CHAIN(FRAME)       m68hc11_frame_chain (FRAME)
+#define FRAME_CHAIN_VALID(chain,frame)	\
+      ((chain) != 0 && (frame) != 0)
+#define FRAME_SAVED_PC(FRAME)    ((FRAME)->return_pc)
+#define FRAME_ARGS_ADDRESS(fi)   (fi)->frame
+#define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
+
+#define SAVED_PC_AFTER_CALL(frame) m68hc11_saved_pc_after_call (frame)
+
+/* Set VAL to the number of args passed to frame described by FI.
+   Can set VAL to -1, meaning no way to tell.  */
+/* We can't tell how many args there are */
+
+#define FRAME_NUM_ARGS(fi) (-1)
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 0
+
+
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.  */
+
+#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)	    \
+   m68hc11_frame_find_saved_regs (frame_info, &(frame_saved_regs))
+
+extern void m68hc11_frame_find_saved_regs (struct frame_info *,
+                                           struct frame_saved_regs *);
+
+#define CALL_DUMMY		{ 0 }
+#define PUSH_DUMMY_FRAME
+#define CALL_DUMMY_START_OFFSET	0
+#define CALL_DUMMY_BREAKPOINT_OFFSET (0)
+
+extern CORE_ADDR m68hc11_call_dummy_address (void);
+#define CALL_DUMMY_ADDRESS() m68hc11_call_dummy_address ()
+
+#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
+sp = m68hc11_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p)
+
+extern CORE_ADDR m68hc11_fix_call_dummy (char *, CORE_ADDR, CORE_ADDR,
+                                         int, struct value **,
+                                         struct type *, int);
+#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
+    sp = m68hc11_push_arguments ((nargs), (args), (sp), \
+                                 (struct_return), (struct_addr))
+extern CORE_ADDR m68hc11_push_arguments (int, struct value **,
+                                         CORE_ADDR, int, CORE_ADDR);
+
+
+/* Extract from an array REGBUF containing the (raw) register state
+   a function return value of type TYPE, and copy that, in virtual format,
+   into VALBUF.  */
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+m68hc11_extract_return_value(TYPE, REGBUF, VALBUF)
+extern void m68hc11_extract_return_value (struct type *, char *, char *);
+
+
+/* Discard from the stack the innermost frame,
+   restoring all saved registers.  */
+#define POP_FRAME m68hc11_pop_frame();
+extern void m68hc11_pop_frame (void);
+
+
+/* Number of bits in the appropriate type.  */
+
+#define TARGET_INT_BIT         (2 * TARGET_CHAR_BIT)
+#define TARGET_PTR_BIT         (2 * TARGET_CHAR_BIT)
+#define TARGET_DOUBLE_BIT      (4 * TARGET_CHAR_BIT)
+#define TARGET_LONG_DOUBLE_BIT (8 * TARGET_CHAR_BIT)
diff -Nrup --exclude-from=gdb-exclude.lst /src/gnu/cygnus/gdb/gdb/configure.tgt gdb/gdb/configure.tgt
--- /src/gnu/cygnus/gdb/gdb/configure.tgt	Sun Jun 25 14:02:42 2000
+++ gdb/gdb/configure.tgt	Sun Jun 25 14:02:41 2000
@@ -17,6 +17,7 @@ arm*)			gdb_target_cpu=arm ;;
 # OBSOLETE c[12])		gdb_target_cpu=convex ;;
 hppa*)			gdb_target_cpu=pa ;;
 i[3456]86*)		gdb_target_cpu=i386 ;;
+m68hc11*|m6811*)	gdb_target_cpu=m68hc11 ;;
 m68*)			gdb_target_cpu=m68k ;;
 m88*)			gdb_target_cpu=m88k ;;
 mips*)			gdb_target_cpu=mips ;;
@@ -133,6 +134,7 @@ ia64-*-linux*)		gdb_target=linux ;;
 
 m32r-*-elf*)		gdb_target=m32r ;;
 
+m68hc11-*-*|m6811-*-*)	gdb_target=m68hc11 ;;
 m68000-*-sunos3*)	gdb_target=sun2os3 ;;
 m68000-*-sunos4*)	gdb_target=sun2os4 ;;
 
diff -Nrup --exclude-from=gdb-exclude.lst /src/gnu/cygnus/gdb/gdb/m68hc11-tdep.c gdb/gdb/m68hc11-tdep.c
--- /src/gnu/cygnus/gdb/gdb/m68hc11-tdep.c	Thu Jan  1 01:00:00 1970
+++ gdb/gdb/m68hc11-tdep.c	Wed Jun 21 10:38:43 2000
@@ -0,0 +1,516 @@
+/* Target-dependent code for Motorola 68HC11
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+   Contributed by Stephane Carrez, stcarrez@worldnet.fr
+
+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 "obstack.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "gdbcmd.h"
+#include "gdbcore.h"
+#include "gdb_string.h"
+#include "value.h"
+#include "inferior.h"
+#include "dis-asm.h"  
+#include "symfile.h"
+#include "objfiles.h"
+
+/* NOTE: This port is not finished. Several operations are not implemented
+   and will raise an error. Most of these functions concern the calling
+   of a function by GDB itself (command 'call') and retrieving data pushed
+   on the stack.  */
+
+void m68hc11_frame_find_saved_regs (struct frame_info *fi,
+                                    struct frame_saved_regs *fsr);
+static void m68hc11_pop_dummy_frame (struct frame_info *fi);
+
+/* Table of registers for 68HC11.  This includes the hard registers
+   and the pseudo hard registers used by GCC.  */
+char*
+m68hc11_register_names[] =
+{
+  "x",    "d",    "y",    "sp",   "pc",   "a",    "b",
+  "ccr",  "z",    "frame","tmp",  "zs",   "xy",
+  "ZD1",  "ZD2",  "ZD3",  "ZD4",  "ZD5",  "ZD6",  "ZD7",
+  "ZD8",  "ZD9",  "ZD10", "ZD11", "ZD12", "ZD13", "ZD14",
+  "ZD15", "ZD16", "ZD17", "ZD18", "ZD19", "ZD20", "ZD21",
+  "ZD22", "ZD23", "ZD24", "ZD25", "ZD26", "ZD27", "ZD28",
+  "ZD29", "ZD30", "ZD31", "ZD32"
+};
+
+static int reg_last    = 32 * 2 + 6;
+static int frame_index = 6;
+
+/* Raise an error for operations which are not yet provided.  */
+static void
+m68hc11_not_yet (const char *operation)
+{
+  error ("Operation '%s' is not yet implemented\n", operation);
+}
+
+/* Immediately after a function call, return the saved pc before the frame
+   is setup.  For sun3's, we check for the common case of being inside of a
+   system call, and if so, we know that Sun pushes the call # on the stack
+   prior to doing the trap. */
+
+CORE_ADDR
+m68hc11_saved_pc_after_call (struct frame_info *frame)
+{
+  unsigned addr = frame->frame + 1 + 2;
+
+  addr = read_register (SP_REGNUM) + 1;
+  addr &= 0x0ffff;
+  return read_memory_integer (addr, 2) & 0x0FFFF;
+}
+
+/* Discard from the stack the innermost frame, restoring all saved
+   registers.  */
+
+void
+m68hc11_pop_frame ()
+{
+  m68hc11_not_yet ("m68hc11_pop_frame");
+}
+
+/* Analyze the function prologue to find some information
+   about the function:
+    - the PC of the first line (for m68hc11_skip_prologue)
+    - the offset of the previous frame saved address (from current frame)
+    - the soft registers which are pushed.  */
+static void
+m68hc11_guess_from_prologue (CORE_ADDR pc, CORE_ADDR* first_line,
+                             int* frame_offset, int* pushed_regs)
+{
+  CORE_ADDR func_end;
+  unsigned char op0, op1, op2;
+  int add_sp_mode;
+  int sp_adjust;
+  int size;
+  int found_frame_point;
+  int found_load;
+  CORE_ADDR first_pc;
+  int reg_saved;
+  
+  first_pc = get_pc_function_start (pc);
+  size = 0;
+
+  if (first_pc == 0)
+    {
+      *frame_offset = 0;
+      *pushed_regs  = 0;
+      *first_line   = pc;
+      return;
+    }
+
+#define OP_PAGE2 (0x18)
+#define OP_LDX  (0xde)
+#define OP_LDY  (0xde)
+#define OP_PSHX (0x3c)
+#define OP_PSHY (0x3c)
+#define OP_STS  (0x9f)
+#define OP_TSX  (0x30)
+#define OP_TSY  (0x30)
+#define OP_XGDX (0x8f)
+#define OP_XGDY (0x8f)
+#define OP_ADDD (0xc3)
+#define OP_TXS  (0x35)
+#define OP_TYS  (0x35)
+
+  /* The 68hc11 stack is as follows:
+
+
+     |           |
+     +-----------+
+     |           |
+     | args      |
+     |           |
+     +-----------+
+     | PC-return |
+     +-----------+
+     | Old frame |
+     +-----------+
+     |           |
+     | Locals    |
+     |           |
+     +-----------+ <--- current frame
+     |           |
+
+     With most processors (like 68K) the previous frame can be computed
+     easily because it is always at a fixed offset (see link/unlink).
+     That is, locals are accessed with negative offsets, arguments are
+     accessed with positive ones.  Since 68hc11 only supports offsets
+     in the range [0..255], the frame is defined at the bottom of
+     locals (see picture).
+
+     The purpose of the analysis made here is to find out the size
+     of locals in this function.  An alternative to this is to use
+     DWARF2 info.  This would be better but I don't know how to
+     access dwarf2 debug from this function.
+     
+     Walk from the function entry point to the point where we save
+     the frame.  While walking instructions, compute the size of bytes
+     which are pushed.  This gives us the index to access the previous
+     frame.
+
+     We limit the search to 128 bytes so that the algorithm is bounded
+     in case of random and wrong code.  We also stop and abort if
+     we find an instruction which is not supposed to appear in the
+     prologue (as generated by gcc 2.95, 2.96).
+  */
+  pc = first_pc;
+  func_end = pc + 128;
+  add_sp_mode = 0;
+  found_frame_point = 0;
+  while (pc + 2 < func_end)
+    {
+      op0 = read_memory_unsigned_integer (pc, 1);
+      op1 = read_memory_unsigned_integer (pc + 1, 1);
+      op2 = read_memory_unsigned_integer (pc + 2, 1);
+      
+      /* ldx *frame */
+      if (op0 == OP_LDX && op1 == frame_index)
+        {
+          pc += 2;
+        }
+
+      /* ldy *frame */
+      else if (op0 == OP_PAGE2 && op1 == OP_LDY && op2 == frame_index)
+        {
+          pc += 3;
+        }
+
+      /* pshx */
+      else if (op0 == OP_PSHX)
+        {
+          pc += 1;
+          size += 2;
+        }
+
+      /* pshy */
+      else if (op0 == OP_PAGE2 && op1 == OP_PSHX)
+        {
+          pc += 2;
+          size += 2;
+        }
+
+      /* sts *frame */
+      else if (op0 == OP_STS && op1 == frame_index)
+        {
+          found_frame_point = 1;
+          pc += 2;
+          break;
+        }
+      else if (op0 == OP_TSX && op1 == OP_XGDX)
+        {
+          add_sp_mode  = 1;
+          pc += 2;
+        }
+      else if (op0 == OP_PAGE2 && op1 == OP_TSY && op2 == OP_PAGE2)
+        {
+          op0 = read_memory_unsigned_integer (pc + 3, 1);
+          if (op0 != OP_XGDY)
+            break;
+          
+          add_sp_mode  = 2;
+          pc += 4;
+        }
+      else if (add_sp_mode && op0 == OP_ADDD)
+        {
+          sp_adjust = read_memory_unsigned_integer (pc + 1, 2);
+          if (sp_adjust & 0x8000)
+            sp_adjust |= 0xffff0000L;
+
+          sp_adjust = -sp_adjust;
+          add_sp_mode |= 4;
+          pc += 3;
+        }
+      else if (add_sp_mode == (1 | 4) && op0 == OP_XGDX
+               && op1 == OP_TXS)
+        {
+          size += sp_adjust;
+          pc += 2;
+          add_sp_mode = 0;
+        }
+      else if (add_sp_mode == (2 | 4) && op0 == OP_PAGE2
+               && op1 == OP_XGDY && op2 == OP_PAGE2)
+        {
+          op0 = read_memory_unsigned_integer (pc + 3, 1);
+          if (op0 != OP_TYS)
+            break;
+
+          size += sp_adjust;
+          pc += 4;
+          add_sp_mode = 0;
+        }
+      else
+        {
+          break;
+        }
+    }
+
+  if (found_frame_point == 0)
+    {
+      *frame_offset = 0;
+    }
+  else
+    {
+      *frame_offset = size;
+    }
+
+  /* Now, look forward to see how many registers are pushed on the stack.
+     We look only for soft registers so there must be a first LDX *REG
+     before a PSHX.  */
+  reg_saved = 0;
+  found_load = 0;
+  while (pc + 2 < func_end)
+    {
+      op0 = read_memory_unsigned_integer (pc, 1);
+      op1 = read_memory_unsigned_integer (pc + 1, 1);
+      op2 = read_memory_unsigned_integer (pc + 2, 1);
+      if (op0 == OP_LDX && op1 > frame_index && op1 <= reg_last)
+        {
+          found_load = 1;
+          pc += 2;
+        }
+      else if (op0 == OP_PAGE2 && op1 == OP_LDY
+               && op2 > frame_index && op2 < reg_last)
+        {
+          found_load = 1;
+          pc += 3;
+        }
+      else if (op0 == OP_PSHX)
+        {
+          /* If there was no load, this is a push for a function call.  */
+          if (found_load == 0)
+            break;
+          
+          reg_saved += 2;
+          pc += 1;
+          found_load = 0;
+        }
+      else if (op0 == OP_PAGE2 && op1 == OP_PSHY)
+        {
+          if (found_load == 0)
+            break;
+          
+          reg_saved += 2;
+          pc += 2;
+          found_load = 0;
+        }
+      else
+        {
+          break;
+        }
+    }
+  *pushed_regs = reg_saved;
+  *first_line  = pc;
+}
+
+
+CORE_ADDR
+m68hc11_skip_prologue (CORE_ADDR pc)
+{
+  CORE_ADDR func_addr, func_end;
+  struct symtab_and_line sal;
+  int frame_offset;
+  int pushed_args;
+
+  /* If we have line debugging information, then the end of the.  */
+  /* prologue should be the first assembly instruction of the
+     first source line.  */
+  if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+    {
+      sal = find_pc_line (func_addr, 0);
+      if (sal.end && sal.end < func_end)
+	return sal.end;
+    }
+
+  m68hc11_guess_from_prologue (pc, &pc, &frame_offset, &pushed_args);
+  return pc;
+}
+
+/* Given a GDB frame, determine the address of the calling function's frame.
+   This will be used to create a new GDB frame struct, and then
+   INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+*/
+
+CORE_ADDR
+m68hc11_frame_chain (struct frame_info *frame)
+{
+  unsigned addr;
+
+  if (frame->return_pc == 0 || inside_entry_file(frame->return_pc))
+    return (CORE_ADDR)0;
+
+  if (frame->frame == 0)
+    {
+      return (CORE_ADDR) 0;
+    }
+
+  addr = frame->frame + frame->size + 1 - 2;
+  addr = read_memory_unsigned_integer (addr, 2) & 0x0FFFF;
+  if (addr == 0)
+    {
+      return (CORE_ADDR)0;
+    }
+    
+  return addr;
+}  
+
+/* Put here the code to store, into a struct frame_saved_regs, the
+   addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.   sp is even more special: the address we
+   return for it IS the sp for the next frame.  */
+void
+m68hc11_frame_find_saved_regs (struct frame_info *fi,
+                               struct frame_saved_regs *fsr)
+{
+  CORE_ADDR pc;
+  int saved;
+  
+  pc = fi->pc;
+  memset (fsr, 0, sizeof (*fsr));
+  m68hc11_guess_from_prologue (pc, &pc, &fi->size, &saved);
+}
+
+void
+m68hc11_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+{
+  unsigned addr;
+  struct frame_saved_regs dummy;
+
+  m68hc11_frame_find_saved_regs (fi, &dummy);
+
+  if (fromleaf)
+    {
+      fi->return_pc = m68hc11_saved_pc_after_call (fi);
+    }
+  else
+    {
+      addr = fi->frame + fi->size + 1;
+      fi->return_pc = read_memory_unsigned_integer (addr, 2) & 0x0ffff;
+
+#if 0
+      printf ("Pc@0x%04x, FR 0x%04x, size %d, read ret @0x%04x -> 0x%04x\n",
+              fi->pc,
+              fi->frame, fi->size,
+              addr & 0x0ffff,
+              fi->return_pc);
+#endif
+    }
+}
+
+/* Same as 'info reg' but prints the registers in a different way.  */
+static void
+show_regs (char *args, int from_tty)
+{
+  int ccr = read_register (PSW_REGNUM);
+  int i;
+    
+  printf_filtered ("PC=%04x SP=%04x FP=%04x CCR=%02x %c%c%c%c%c%c%c%c\n",
+		   read_register (PC_REGNUM),
+		   read_register (SP_REGNUM),
+		   read_register (FP_REGNUM),
+		   ccr,
+		   ccr & M6811_S_BIT ? 'S' : '-',
+		   ccr & M6811_X_BIT ? 'X' : '-',
+		   ccr & M6811_H_BIT ? 'H' : '-',
+		   ccr & M6811_I_BIT ? 'I' : '-',
+		   ccr & M6811_N_BIT ? 'N' : '-',
+		   ccr & M6811_Z_BIT ? 'Z' : '-',
+		   ccr & M6811_V_BIT ? 'V' : '-',
+		   ccr & M6811_C_BIT ? 'C' : '-');
+
+  printf_filtered ("D=%04x IX=%04x IY=%04x\n",
+		   read_register (D_REGNUM),
+		   read_register (X_REGNUM),
+		   read_register (Y_REGNUM));
+  for (i = ZD1_REGNUM; i <= ZD32_REGNUM; i++)
+    {
+      printf_filtered ("ZD%d=%04x",
+                       i - ZD1_REGNUM + 1,
+                       read_register (i));
+      if (((i - ZD1_REGNUM) % 8) == 7)
+        printf_filtered ("\n");
+      else
+        printf_filtered (" ");
+    }
+}
+
+CORE_ADDR
+m68hc11_fix_call_dummy (char *dummyname,
+                        CORE_ADDR start_sp,
+                        CORE_ADDR fun,
+                        int nargs,
+                        value_ptr *args,
+                        struct type *type,
+                        int gcc_p)
+{
+  m68hc11_not_yet ("m68hc11_fix_call_dummy");
+  return 0;
+}
+
+static void
+m68hc11_pop_dummy_frame (struct frame_info *fi)
+{
+  m68hc11_not_yet ("m68hc11_pop_dummy_frame");
+}
+
+
+CORE_ADDR
+m68hc11_push_arguments (int nargs,
+                        value_ptr *args,
+                        CORE_ADDR sp,
+                        int struct_return,
+                        CORE_ADDR struct_addr)
+{
+  m68hc11_not_yet ("m68hc11_push_arguments");
+  return 0;
+}
+
+
+CORE_ADDR
+m68hc11_call_dummy_address ()
+{
+  m68hc11_not_yet ("m68hc11_call_dummy_address");
+  return 0;  
+}
+
+/* Given a return value in `regbuf' with a type `valtype', 
+   extract and copy its value into `valbuf'.  */
+
+void
+m68hc11_extract_return_value (struct type *valtype,
+                              char *regbuf,
+                              char *valbuf)
+{
+  m68hc11_not_yet ("m68hc11_extract_return_value");
+}
+
+void
+_initialize_m68hc11_tdep ()
+{
+  tm_print_insn = print_insn_m68hc11;
+
+  add_com ("regs", class_vars, show_regs, "Print all registers");
+} 
+



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