[thirdparty/binutils-gdb.git] / gdb / z8k-tdep.c

/* Target-machine dependent code for Zilog Z8000, for GDB.
   Copyright (C) 1992, 1993, 1994 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.  */

/*
   Contributed by Steve Chamberlain
   sac@cygnus.com
 */

#include "defs.h"
#include "frame.h"
#include "obstack.h"
#include "symtab.h"
#include "gdbcmd.h"
#include "gdbtypes.h"
#include "dis-asm.h"
#include "gdbcore.h"


/* Return the saved PC from this frame.

   If the frame has a memory copy of SRP_REGNUM, use that.  If not,
   just use the register SRP_REGNUM itself.  */

CORE_ADDR
frame_saved_pc (frame)
     struct frame_info *frame;
{
  return read_memory_pointer (frame->frame + (BIG ? 4 : 2));
}

#define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0))
#define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0))
#define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa)
#define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76)
#define IS_SUB2_SP(x) (x==0x1b87)
#define IS_MOVK_R5(x) (x==0x7905)
#define IS_SUB_SP(x) ((x & 0xffff) == 0x020f)
#define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa))

/* work out how much local space is on the stack and
   return the pc pointing to the first push */

static CORE_ADDR
skip_adjust (pc, size)
     CORE_ADDR pc;
     int *size;
{
  *size = 0;

  if (IS_PUSH_FP (read_memory_short (pc))
      && IS_MOV_SP_FP (read_memory_short (pc + 2)))
    {
      /* This is a function with an explict frame pointer */
      pc += 4;
      *size += 2;		/* remember the frame pointer */
    }

  /* remember any stack adjustment */
  if (IS_SUB_SP (read_memory_short (pc)))
    {
      *size += read_memory_short (pc + 2);
      pc += 4;
    }
  return pc;
}

static CORE_ADDR examine_frame PARAMS ((CORE_ADDR, CORE_ADDR * regs, CORE_ADDR));
static CORE_ADDR
examine_frame (pc, regs, sp)
     CORE_ADDR pc;
     CORE_ADDR *regs;
     CORE_ADDR sp;
{
  int w = read_memory_short (pc);
  int offset = 0;
  int regno;

  for (regno = 0; regno < NUM_REGS; regno++)
    regs[regno] = 0;

  while (IS_PUSHW (w) || IS_PUSHL (w))
    {
      /* work out which register is being pushed to where */
      if (IS_PUSHL (w))
	{
	  regs[w & 0xf] = offset;
	  regs[(w & 0xf) + 1] = offset + 2;
	  offset += 4;
	}
      else
	{
	  regs[w & 0xf] = offset;
	  offset += 2;
	}
      pc += 2;
      w = read_memory_short (pc);
    }

  if (IS_MOVE_FP (w))
    {
      /* We know the fp */

    }
  else if (IS_SUB_SP (w))
    {
      /* Subtracting a value from the sp, so were in a function
         which needs stack space for locals, but has no fp.  We fake up
         the values as if we had an fp */
      regs[FP_REGNUM] = sp;
    }
  else
    {
      /* This one didn't have an fp, we'll fake it up */
      regs[SP_REGNUM] = sp;
    }
  /* stack pointer contains address of next frame */
  /*  regs[fp_regnum()] = fp; */
  regs[SP_REGNUM] = sp;
  return pc;
}

CORE_ADDR
z8k_skip_prologue (start_pc)
     CORE_ADDR start_pc;
{
  CORE_ADDR dummy[NUM_REGS];

  return examine_frame (start_pc, dummy, 0);
}

CORE_ADDR
z8k_addr_bits_remove (addr)
     CORE_ADDR addr;
{
  return (addr & PTR_MASK);
}

int
read_memory_pointer (x)
     CORE_ADDR x;
{
  return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2);
}

CORE_ADDR
frame_chain (thisframe)
     struct frame_info *thisframe;
{
  if (thisframe->prev == 0)
    {
      /* This is the top of the stack, let's get the sp for real */
    }
  if (!inside_entry_file (thisframe->pc))
    {
      return read_memory_pointer (thisframe->frame);
    }
  return 0;
}

void
init_frame_pc ()
{
  abort ();
}

/* 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
z8k_frame_init_saved_regs (frame_info)
     struct frame_info *frame_info;
{
  CORE_ADDR pc;
  int w;

  frame_saved_regs_zalloc (frame_info);
  pc = get_pc_function_start (frame_info->pc);

  /* wander down the instruction stream */
  examine_frame (pc, frame_info->saved_regs, frame_info->frame);

}

void
z8k_push_dummy_frame ()
{
  abort ();
}

int
gdb_print_insn_z8k (memaddr, info)
     bfd_vma memaddr;
     disassemble_info *info;
{
  if (BIG)
    return print_insn_z8001 (memaddr, info);
  else
    return print_insn_z8002 (memaddr, info);
}

/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
   is not the address of a valid instruction, the address of the next
   instruction beyond ADDR otherwise.  *PWORD1 receives the first word
   of the instruction. */

CORE_ADDR
NEXT_PROLOGUE_INSN (addr, lim, pword1)
     CORE_ADDR addr;
     CORE_ADDR lim;
     short *pword1;
{
  char buf[2];
  if (addr < lim + 8)
    {
      read_memory (addr, buf, 2);
      *pword1 = extract_signed_integer (buf, 2);

      return addr + 2;
    }
  return 0;
}

#if 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.

   We cache the result of doing this in the frame_cache_obstack, since
   it is fairly expensive.  */

void
frame_find_saved_regs (fip, fsrp)
     struct frame_info *fip;
     struct frame_saved_regs *fsrp;
{
  int locals;
  CORE_ADDR pc;
  CORE_ADDR adr;
  int i;

  memset (fsrp, 0, sizeof *fsrp);

  pc = skip_adjust (get_pc_function_start (fip->pc), &locals);

  {
    adr = FRAME_FP (fip) - locals;
    for (i = 0; i < 8; i++)
      {
	int word = read_memory_short (pc);

	pc += 2;
	if (IS_PUSHL (word))
	  {
	    fsrp->regs[word & 0xf] = adr;
	    fsrp->regs[(word & 0xf) + 1] = adr - 2;
	    adr -= 4;
	  }
	else if (IS_PUSHW (word))
	  {
	    fsrp->regs[word & 0xf] = adr;
	    adr -= 2;
	  }
	else
	  break;
      }

  }

  fsrp->regs[PC_REGNUM] = fip->frame + 4;
  fsrp->regs[FP_REGNUM] = fip->frame;

}
#endif

int
saved_pc_after_call ()
{
  return ADDR_BITS_REMOVE
    (read_memory_integer (read_register (SP_REGNUM), PTR_SIZE));
}


void
extract_return_value (type, regbuf, valbuf)
     struct type *type;
     char *regbuf;
     char *valbuf;
{
  int b;
  int len = TYPE_LENGTH (type);

  for (b = 0; b < len; b += 2)
    {
      int todo = len - b;

      if (todo > 2)
	todo = 2;
      memcpy (valbuf + b, regbuf + b, todo);
    }
}

void
write_return_value (type, valbuf)
     struct type *type;
     char *valbuf;
{
  int reg;
  int len;

  for (len = 0; len < TYPE_LENGTH (type); len += 2)
    write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2);
}

void
store_struct_return (addr, sp)
     CORE_ADDR addr;
     CORE_ADDR sp;
{
  write_register (2, addr);
}


void
print_register_hook (regno)
     int regno;
{
  if ((regno & 1) == 0 && regno < 16)
    {
      unsigned short l[2];

      read_relative_register_raw_bytes (regno, (char *) (l + 0));
      read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
      printf_unfiltered ("\t");
      printf_unfiltered ("%04x%04x", l[0], l[1]);
    }

  if ((regno & 3) == 0 && regno < 16)
    {
      unsigned short l[4];

      read_relative_register_raw_bytes (regno, (char *) (l + 0));
      read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
      read_relative_register_raw_bytes (regno + 2, (char *) (l + 2));
      read_relative_register_raw_bytes (regno + 3, (char *) (l + 3));

      printf_unfiltered ("\t");
      printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]);
    }
  if (regno == 15)
    {
      unsigned short rval;
      int i;

      read_relative_register_raw_bytes (regno, (char *) (&rval));

      printf_unfiltered ("\n");
      for (i = 0; i < 10; i += 2)
	{
	  printf_unfiltered ("(sp+%d=%04x)", i, read_memory_short (rval + i));
	}
    }

}

void
z8k_pop_frame ()
{
}

struct cmd_list_element *setmemorylist;

void
z8k_set_pointer_size (newsize)
     int newsize;
{
  static int oldsize = 0;

  if (oldsize != newsize)
    {
      printf_unfiltered ("pointer size set to %d bits\n", newsize);
      oldsize = newsize;
      if (newsize == 32)
	{
	  BIG = 1;
	}
      else
	{
	  BIG = 0;
	}
      _initialize_gdbtypes ();
    }
}

static void
segmented_command (args, from_tty)
     char *args;
     int from_tty;
{
  z8k_set_pointer_size (32);
}

static void
unsegmented_command (args, from_tty)
     char *args;
     int from_tty;
{
  z8k_set_pointer_size (16);
}

static void
set_memory (args, from_tty)
     char *args;
     int from_tty;
{
  printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n");
  help_list (setmemorylist, "set memory ", -1, gdb_stdout);
}

void
_initialize_z8ktdep ()
{
  tm_print_insn = gdb_print_insn_z8k;

  add_prefix_cmd ("memory", no_class, set_memory,
		  "set the memory model", &setmemorylist, "set memory ", 0,
		  &setlist);
  add_cmd ("segmented", class_support, segmented_command,
	   "Set segmented memory model.", &setmemorylist);
  add_cmd ("unsegmented", class_support, unsegmented_command,
	   "Set unsegmented memory model.", &setmemorylist);

}
Commit	Line	Data
c906108c SS	1	/* Target-machine dependent code for Zilog Z8000, for GDB.
	2	Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
	3
c5aa993b	4	This file is part of GDB.
c906108c	5
c5aa993b JM	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
c906108c	10
c5aa993b JM	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
c906108c	15
c5aa993b JM	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
c906108c SS	20
c906108c SS	21	/*
c5aa993b JM	22	Contributed by Steve Chamberlain
c5aa993b JM	23	sac@cygnus.com
c906108c SS	24	*/
	25
	26	#include "defs.h"
	27	#include "frame.h"
	28	#include "obstack.h"
	29	#include "symtab.h"
	30	#include "gdbcmd.h"
	31	#include "gdbtypes.h"
	32	#include "dis-asm.h"
	33	#include "gdbcore.h"
	34
	35
	36	/* Return the saved PC from this frame.
	37
	38	If the frame has a memory copy of SRP_REGNUM, use that. If not,
	39	just use the register SRP_REGNUM itself. */
	40
	41	CORE_ADDR
	42	frame_saved_pc (frame)
	43	struct frame_info *frame;
	44	{
	45	return read_memory_pointer (frame->frame + (BIG ? 4 : 2));
	46	}
	47
	48	#define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0))
	49	#define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0))
	50	#define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa)
	51	#define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76)
	52	#define IS_SUB2_SP(x) (x==0x1b87)
	53	#define IS_MOVK_R5(x) (x==0x7905)
	54	#define IS_SUB_SP(x) ((x & 0xffff) == 0x020f)
	55	#define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa))
	56
	57	/* work out how much local space is on the stack and
	58	return the pc pointing to the first push */
	59
	60	static CORE_ADDR
	61	skip_adjust (pc, size)
	62	CORE_ADDR pc;
	63	int *size;
	64	{
	65	*size = 0;
	66
	67	if (IS_PUSH_FP (read_memory_short (pc))
	68	&& IS_MOV_SP_FP (read_memory_short (pc + 2)))
	69	{
	70	/* This is a function with an explict frame pointer */
	71	pc += 4;
	72	size += 2; / remember the frame pointer */
	73	}
	74
	75	/* remember any stack adjustment */
	76	if (IS_SUB_SP (read_memory_short (pc)))
	77	{
	78	*size += read_memory_short (pc + 2);
	79	pc += 4;
	80	}
	81	return pc;
	82	}
	83
c5aa993b	84	static CORE_ADDR examine_frame PARAMS ((CORE_ADDR, CORE_ADDR * regs, CORE_ADDR));
c906108c SS	85	static CORE_ADDR
	86	examine_frame (pc, regs, sp)
	87	CORE_ADDR pc;
	88	CORE_ADDR *regs;
	89	CORE_ADDR sp;
	90	{
	91	int w = read_memory_short (pc);
	92	int offset = 0;
	93	int regno;
	94
	95	for (regno = 0; regno < NUM_REGS; regno++)
	96	regs[regno] = 0;
	97
	98	while (IS_PUSHW (w) \|\| IS_PUSHL (w))
	99	{
	100	/* work out which register is being pushed to where */
	101	if (IS_PUSHL (w))
	102	{
	103	regs[w & 0xf] = offset;
	104	regs[(w & 0xf) + 1] = offset + 2;
	105	offset += 4;
	106	}
	107	else
	108	{
	109	regs[w & 0xf] = offset;
	110	offset += 2;
	111	}
	112	pc += 2;
	113	w = read_memory_short (pc);
	114	}
	115
	116	if (IS_MOVE_FP (w))
	117	{
	118	/* We know the fp */
	119
	120	}
	121	else if (IS_SUB_SP (w))
	122	{
	123	/* Subtracting a value from the sp, so were in a function
c5aa993b JM	124	which needs stack space for locals, but has no fp. We fake up
c5aa993b JM	125	the values as if we had an fp */
c906108c SS	126	regs[FP_REGNUM] = sp;
	127	}
	128	else
	129	{
	130	/* This one didn't have an fp, we'll fake it up */
	131	regs[SP_REGNUM] = sp;
	132	}
	133	/* stack pointer contains address of next frame */
c5aa993b	134	/* regs[fp_regnum()] = fp; */
c906108c SS	135	regs[SP_REGNUM] = sp;
	136	return pc;
	137	}
	138
	139	CORE_ADDR
	140	z8k_skip_prologue (start_pc)
	141	CORE_ADDR start_pc;
	142	{
	143	CORE_ADDR dummy[NUM_REGS];
	144
	145	return examine_frame (start_pc, dummy, 0);
	146	}
	147
	148	CORE_ADDR
	149	z8k_addr_bits_remove (addr)
	150	CORE_ADDR addr;
	151	{
	152	return (addr & PTR_MASK);
	153	}
	154
	155	int
	156	read_memory_pointer (x)
	157	CORE_ADDR x;
	158	{
	159	return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2);
	160	}
	161
	162	CORE_ADDR
	163	frame_chain (thisframe)
	164	struct frame_info *thisframe;
	165	{
	166	if (thisframe->prev == 0)
	167	{
	168	/* This is the top of the stack, let's get the sp for real */
	169	}
	170	if (!inside_entry_file (thisframe->pc))
	171	{
	172	return read_memory_pointer (thisframe->frame);
	173	}
	174	return 0;
	175	}
	176
	177	void
	178	init_frame_pc ()
	179	{
	180	abort ();
	181	}
	182
	183	/* Put here the code to store, into a struct frame_saved_regs,
	184	the addresses of the saved registers of frame described by FRAME_INFO.
	185	This includes special registers such as pc and fp saved in special
	186	ways in the stack frame. sp is even more special:
	187	the address we return for it IS the sp for the next frame. */
	188
	189	void
	190	z8k_frame_init_saved_regs (frame_info)
	191	struct frame_info *frame_info;
	192	{
	193	CORE_ADDR pc;
	194	int w;
	195
	196	frame_saved_regs_zalloc (frame_info);
	197	pc = get_pc_function_start (frame_info->pc);
	198
199	/* wander down the instruction stream */
200	examine_frame (pc, frame_info->saved_regs, frame_info->frame);
201
202	}
203
204	void
205	z8k_push_dummy_frame ()
206	{
207	abort ();
208	}
209
210	int
211	gdb_print_insn_z8k (memaddr, info)
212	bfd_vma memaddr;
213	disassemble_info *info;
214	{
215	if (BIG)
216	return print_insn_z8001 (memaddr, info);
217	else
218	return print_insn_z8002 (memaddr, info);
219	}
220
221	/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
222	is not the address of a valid instruction, the address of the next
223	instruction beyond ADDR otherwise. *PWORD1 receives the first word
c5aa993b	224	of the instruction. */
c906108c SS	225
	226	CORE_ADDR
	227	NEXT_PROLOGUE_INSN (addr, lim, pword1)
	228	CORE_ADDR addr;
	229	CORE_ADDR lim;
	230	short *pword1;
	231	{
	232	char buf[2];
	233	if (addr < lim + 8)
	234	{
	235	read_memory (addr, buf, 2);
	236	*pword1 = extract_signed_integer (buf, 2);
	237
	238	return addr + 2;
	239	}
	240	return 0;
	241	}
	242
	243	#if 0
	244	/* Put here the code to store, into a struct frame_saved_regs,
	245	the addresses of the saved registers of frame described by FRAME_INFO.
	246	This includes special registers such as pc and fp saved in special
	247	ways in the stack frame. sp is even more special:
	248	the address we return for it IS the sp for the next frame.
	249
	250	We cache the result of doing this in the frame_cache_obstack, since
	251	it is fairly expensive. */
	252
	253	void
	254	frame_find_saved_regs (fip, fsrp)
	255	struct frame_info *fip;
	256	struct frame_saved_regs *fsrp;
	257	{
	258	int locals;
	259	CORE_ADDR pc;
	260	CORE_ADDR adr;
	261	int i;
	262
	263	memset (fsrp, 0, sizeof *fsrp);
	264
	265	pc = skip_adjust (get_pc_function_start (fip->pc), &locals);
	266
	267	{
	268	adr = FRAME_FP (fip) - locals;
	269	for (i = 0; i < 8; i++)
	270	{
	271	int word = read_memory_short (pc);
	272
	273	pc += 2;
	274	if (IS_PUSHL (word))
	275	{
	276	fsrp->regs[word & 0xf] = adr;
	277	fsrp->regs[(word & 0xf) + 1] = adr - 2;
	278	adr -= 4;
	279	}
	280	else if (IS_PUSHW (word))
	281	{
	282	fsrp->regs[word & 0xf] = adr;
	283	adr -= 2;
	284	}
	285	else
	286	break;
	287	}
	288
289	}
290
291	fsrp->regs[PC_REGNUM] = fip->frame + 4;
292	fsrp->regs[FP_REGNUM] = fip->frame;
293
294	}
295	#endif
296
297	int
298	saved_pc_after_call ()
299	{
c5aa993b	300	return ADDR_BITS_REMOVE
c906108c SS	301	(read_memory_integer (read_register (SP_REGNUM), PTR_SIZE));
	302	}
	303
	304
	305	void
	306	extract_return_value (type, regbuf, valbuf)
	307	struct type *type;
	308	char *regbuf;
	309	char *valbuf;
	310	{
	311	int b;
	312	int len = TYPE_LENGTH (type);
	313
	314	for (b = 0; b < len; b += 2)
	315	{
	316	int todo = len - b;
	317
	318	if (todo > 2)
	319	todo = 2;
	320	memcpy (valbuf + b, regbuf + b, todo);
	321	}
	322	}
	323
	324	void
	325	write_return_value (type, valbuf)
	326	struct type *type;
	327	char *valbuf;
	328	{
	329	int reg;
	330	int len;
	331
	332	for (len = 0; len < TYPE_LENGTH (type); len += 2)
c5aa993b	333	write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2);
c906108c SS	334	}
	335
	336	void
	337	store_struct_return (addr, sp)
	338	CORE_ADDR addr;
	339	CORE_ADDR sp;
	340	{
	341	write_register (2, addr);
	342	}
	343
	344
	345	void
	346	print_register_hook (regno)
	347	int regno;
	348	{
	349	if ((regno & 1) == 0 && regno < 16)
	350	{
	351	unsigned short l[2];
	352
	353	read_relative_register_raw_bytes (regno, (char *) (l + 0));
	354	read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
	355	printf_unfiltered ("\t");
	356	printf_unfiltered ("%04x%04x", l[0], l[1]);
	357	}
	358
	359	if ((regno & 3) == 0 && regno < 16)
	360	{
	361	unsigned short l[4];
	362
	363	read_relative_register_raw_bytes (regno, (char *) (l + 0));
	364	read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
	365	read_relative_register_raw_bytes (regno + 2, (char *) (l + 2));
	366	read_relative_register_raw_bytes (regno + 3, (char *) (l + 3));
	367
	368	printf_unfiltered ("\t");
	369	printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]);
	370	}
	371	if (regno == 15)
	372	{
	373	unsigned short rval;
	374	int i;
	375
	376	read_relative_register_raw_bytes (regno, (char *) (&rval));
	377
	378	printf_unfiltered ("\n");
	379	for (i = 0; i < 10; i += 2)
	380	{
	381	printf_unfiltered ("(sp+%d=%04x)", i, read_memory_short (rval + i));
	382	}
	383	}
	384
	385	}
	386
	387	void
	388	z8k_pop_frame ()
	389	{
	390	}
	391
	392	struct cmd_list_element *setmemorylist;
	393
	394	void
	395	z8k_set_pointer_size (newsize)
	396	int newsize;
	397	{
398	static int oldsize = 0;
399
400	if (oldsize != newsize)
401	{
402	printf_unfiltered ("pointer size set to %d bits\n", newsize);
403	oldsize = newsize;
404	if (newsize == 32)
405	{
406	BIG = 1;
407	}
408	else
409	{
410	BIG = 0;
411	}
412	_initialize_gdbtypes ();
413	}
414	}
415
416	static void
417	segmented_command (args, from_tty)
418	char *args;
419	int from_tty;
420	{
421	z8k_set_pointer_size (32);
422	}
423
424	static void
425	unsegmented_command (args, from_tty)
426	char *args;
427	int from_tty;
428	{
429	z8k_set_pointer_size (16);
430	}
431
432	static void
433	set_memory (args, from_tty)
434	char *args;
435	int from_tty;
436	{
437	printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n");
438	help_list (setmemorylist, "set memory ", -1, gdb_stdout);
439	}
440
441	void
442	_initialize_z8ktdep ()
443	{
444	tm_print_insn = gdb_print_insn_z8k;
445
446	add_prefix_cmd ("memory", no_class, set_memory,
447	"set the memory model", &setmemorylist, "set memory ", 0,
448	&setlist);
449	add_cmd ("segmented", class_support, segmented_command,
450	"Set segmented memory model.", &setmemorylist);
451	add_cmd ("unsegmented", class_support, unsegmented_command,
452	"Set unsegmented memory model.", &setmemorylist);
453
454	}