[binutils.git] / gdb / config / ns32k / tm-umax.h

/* Definitions to make GDB run on an encore under umax 4.2
   Copyright 1987, 1989, 1991, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* This is also included by tm-ns32km3.h, as well as being used by umax.  */

#define TARGET_BYTE_ORDER LITTLE_ENDIAN

/* Need to get function ends by adding this to epilogue address from .bf
   record, not using x_fsize field.  */
#define FUNCTION_EPILOGUE_SIZE 4

/* Offset from address of function to start of its code.
   Zero on most machines.  */

#define FUNCTION_START_OFFSET 0

/* Advance PC across any function entry prologue instructions
   to reach some "real" code.  */

#define SKIP_PROLOGUE(pc)   				\
{ register unsigned char op = read_memory_integer (pc, 1);	\
  if (op == 0x82) { op = read_memory_integer (pc+2,1);  \
  		    if ((op & 0x80) == 0) pc += 3;	\
		    else if ((op & 0xc0) == 0x80) pc += 4;	\
		    else pc += 6;			\
		   }					\
}

/* Immediately after a function call, return the saved pc.
   Can't always go through the frames for this because on some machines
   the new frame is not set up until the new function executes
   some instructions.  */

#define SAVED_PC_AFTER_CALL(frame) \
	read_memory_integer (read_register (SP_REGNUM), 4)

/* Address of end of stack space.  */

#ifndef STACK_END_ADDR
#define STACK_END_ADDR (0xfffff000)
#endif

/* Stack grows downward.  */

#define INNER_THAN <

/* Sequence of bytes for breakpoint instruction.  */

#define BREAKPOINT {0xf2}

/* Amount PC must be decremented by after a breakpoint.
   This is often the number of bytes in BREAKPOINT
   but not always.  */

#define DECR_PC_AFTER_BREAK 0

/* Nonzero if instruction at PC is a return instruction.  */

#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)

#if 0 /* Disable until fixed *correctly*.  */
#ifndef INVALID_FLOAT
#ifndef NaN
#include <nan.h>
#endif NaN

/* Return 1 if P points to an invalid floating point value.  */
/* Surely wrong for cross-debugging.  */
#define INVALID_FLOAT(p, s) \
	 ((s == sizeof (float))?	\
		NaF (*(float *) p) :	\
		NaD (*(double *) p))
#endif /* INVALID_FLOAT */
#endif

/* Say how long (ordinary) registers are.  This is a piece of bogosity
   used in push_word and a few other places; REGISTER_RAW_SIZE is the
   real way to know how big a register is.  */

#define REGISTER_SIZE 4

/* Number of machine registers */

#define NUM_REGS		25

#define NUM_GENERAL_REGS	8

/* Initializer for an array of names of registers.
   There should be NUM_REGS strings in this initializer.  */

#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",	\
 			"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",	\
			"sp", "fp", "pc", "ps",				\
 			"fsr",						\
			"l0", "l1", "l2", "l3", "xx",			\
 			}

/* 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	R0_REGNUM 0		/* General register 0 */
#define FP0_REGNUM 8		/* Floating point register 0 */
#define SP_REGNUM 16		/* Contains address of top of stack */
#define AP_REGNUM FP_REGNUM
#define FP_REGNUM 17		/* Contains address of executing stack frame */
#define PC_REGNUM 18		/* Contains program counter */
#define PS_REGNUM 19		/* Contains processor status */
#define FPS_REGNUM 20		/* Floating point status register */
#define LP0_REGNUM 21		/* Double register 0 (same as FP0) */

/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.  */
#define REGISTER_BYTES \
  ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
   + 4            * REGISTER_RAW_SIZE(LP0_REGNUM))

/* Index within `registers' of the first byte of the space for
   register N.  */

#define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
	LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)

/* Number of bytes of storage in the actual machine representation
   for register N.  On the 32000, all regs are 4 bytes
   except for the doubled floating registers. */

#define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)

/* Number of bytes of storage in the program's representation
   for register N.  On the 32000, all regs are 4 bytes
   except for the doubled floating registers. */

#define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)

/* 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) \
	(((N) < FP0_REGNUM) ?				\
		builtin_type_int :			\
		((N) < FP0_REGNUM + 8) ?		\
			builtin_type_float :		\
			((N) < LP0_REGNUM) ?		\
				builtin_type_int :	\
				builtin_type_double)

/* Store the address of the place in which to copy the structure the
   subroutine will return.  This is called from call_function.

   On this machine this is a no-op, because gcc isn't used on it
   yet.  So this calling convention is not used. */

#define STORE_STRUCT_RETURN(ADDR, SP)

/* 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) \
  memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE))

/* Write into appropriate registers a function return value
   of type TYPE, given in virtual format.  */

#define STORE_RETURN_VALUE(TYPE,VALBUF) \
  write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), 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) (*(int *)(REGBUF))
\f
/* Describe the pointer in each stack frame to the previous stack frame
   (its caller).  */

/* FRAME_CHAIN takes a frame's nominal address
   and produces the frame's chain-pointer. */

/* In the case of the ns32000 series, the frame's nominal address is the FP
   value, and at that address is saved previous FP value as a 4-byte word.  */

#define FRAME_CHAIN(thisframe)  \
  (!inside_entry_file ((thisframe)->pc) ? \
   read_memory_integer ((thisframe)->frame, 4) :\
   0)

/* Define other aspects of the stack frame.  */

#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))

/* Compute base of arguments. */

#define FRAME_ARGS_ADDRESS(fi)	\
  ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
	((fi)->frame) : (read_register (SP_REGNUM) - 4))

#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)

/* Get the address of the enter opcode for this function, if it is active.
   Returns positive address > 1 if pc is between enter/exit,
   1 if pc before enter or after exit, 0 otherwise. */

extern CORE_ADDR ns32k_get_enter_addr ();

/* Return number of args passed to a frame.
   Can return -1, meaning no way to tell.
   Encore's C compiler often reuses same area on stack for args,
   so this will often not work properly.  If the arg names
   are known, it's likely most of them will be printed. */

#define FRAME_NUM_ARGS(numargs, fi)			\
{ CORE_ADDR	pc;					\
  CORE_ADDR	enter_addr;				\
  unsigned int	insn;					\
  unsigned int	addr_mode;				\
  int width;						\
							\
  numargs = -1;						\
  enter_addr = ns32k_get_enter_addr ((fi)->pc);		\
  if (enter_addr > 0)					\
    {							\
      pc = (enter_addr == 1) ?				\
	SAVED_PC_AFTER_CALL (fi) :			\
	FRAME_SAVED_PC (fi);				\
      insn = read_memory_integer (pc,2);		\
      addr_mode = (insn >> 11) & 0x1f;			\
      insn = insn & 0x7ff;				\
      if ((insn & 0x7fc) == 0x57c &&			\
		addr_mode == 0x14) /* immediate */	\
	{						\
	  if (insn == 0x57c) /* adjspb */		\
  		width = 1;				\
	  else if (insn == 0x57d) /* adjspw */		\
  		width = 2;				\
	  else if (insn == 0x57f) /* adjspd */		\
  		width = 4;				\
	  numargs = read_memory_integer (pc+2,width);	\
	  if (width > 1)				\
	    flip_bytes (&numargs, width);		\
	  numargs = - sign_extend (numargs, width*8) / 4;\
	}						\
    }							\
}

/* Return number of bytes at start of arglist that are not really args.  */

#define FRAME_ARGS_SKIP 8

/* 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)	\
{ 								\
  register int	regmask, regnum;				\
  int		localcount;					\
  register CORE_ADDR	enter_addr;				\
  register CORE_ADDR	next_addr;				\
								\
  memset (&(frame_saved_regs), '\0', sizeof (frame_saved_regs));	\
  enter_addr = ns32k_get_enter_addr ((frame_info)->pc);		\
  if (enter_addr > 1)						\
    {								\
      regmask = read_memory_integer (enter_addr+1, 1) & 0xff;	\
      localcount = ns32k_localcount (enter_addr);		\
      next_addr = (frame_info)->frame + localcount;		\
      for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)	\
	(frame_saved_regs).regs[regnum] = (regmask & 1) ?	\
					  (next_addr -= 4) : 0;	\
      (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
      (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
      (frame_saved_regs).regs[FP_REGNUM] =			\
		  (read_memory_integer ((frame_info)->frame, 4));\
    }								\
  else if (enter_addr == 1)					\
    {								\
      CORE_ADDR sp = read_register (SP_REGNUM);			\
      (frame_saved_regs).regs[PC_REGNUM] = sp;			\
      (frame_saved_regs).regs[SP_REGNUM] = sp + 4;		\
    }								\
}
\f
/* Things needed for making the inferior call functions.  */

/* Push an empty stack frame, to record the current PC, etc.  */

#define PUSH_DUMMY_FRAME \
{ register CORE_ADDR sp = read_register (SP_REGNUM);\
  register int regnum;				    \
  sp = push_word (sp, read_register (PC_REGNUM));   \
  sp = push_word (sp, read_register (FP_REGNUM));   \
  write_register (FP_REGNUM, sp);		    \
  for (regnum = 0; regnum < 8; regnum++)  \
    sp = push_word (sp, read_register (regnum));    \
  write_register (SP_REGNUM, sp);  			\
}

/* Discard from the stack the innermost frame, restoring all registers.  */

#define POP_FRAME  \
{ register struct frame_info *frame = get_current_frame ();	 \
  register CORE_ADDR fp;					 \
  register int regnum;						 \
  struct frame_saved_regs fsr;					 \
  struct frame_info *fi;						 \
  fp = frame->frame;						 \
  get_frame_saved_regs (frame, &fsr);				 \
  for (regnum = 0; regnum < 8; regnum++)			 \
    if (fsr.regs[regnum])					 \
      write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
  write_register (FP_REGNUM, read_memory_integer (fp, 4));	 \
  write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
  write_register (SP_REGNUM, fp + 8);				 \
  flush_cached_frames ();					 \
}

/* This sequence of words is the instructions
     enter	0xff,0		82 ff 00
     jsr	@0x00010203	7f ae c0 01 02 03
     adjspd	0x69696969	7f a5 01 02 03 04
     bpt			f2
   Note this is 16 bytes.  */

#define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }

#define CALL_DUMMY_START_OFFSET	3
#define CALL_DUMMY_LENGTH	16
#define CALL_DUMMY_ADDR		5
#define CALL_DUMMY_NARGS	11

/* Insert the specified number of args and function address
   into a call sequence of the above form stored at DUMMYNAME.  */

#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   		\
{								\
	int	flipped;					\
	flipped = fun | 0xc0000000;				\
	flip_bytes (&flipped, 4);				\
	*((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;	\
	flipped = - nargs * 4;					\
	flip_bytes (&flipped, 4);				\
	*((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped;	\
}
Commit	Line	Data
5076de82 FF	1	/* Definitions to make GDB run on an encore under umax 4.2
	2	Copyright 1987, 1989, 1991, 1993 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	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.
	10
	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.
	15
	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., 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
5d76c8e6 JK	20	/* This is also included by tm-ns32km3.h, as well as being used by umax. */
5d76c8e6 JK	21
5076de82 FF	22	#define TARGET_BYTE_ORDER LITTLE_ENDIAN
	23
	24	/* Need to get function ends by adding this to epilogue address from .bf
	25	record, not using x_fsize field. */
	26	#define FUNCTION_EPILOGUE_SIZE 4
	27
	28	/* Offset from address of function to start of its code.
	29	Zero on most machines. */
	30
	31	#define FUNCTION_START_OFFSET 0
	32
	33	/* Advance PC across any function entry prologue instructions
	34	to reach some "real" code. */
	35
	36	#define SKIP_PROLOGUE(pc) \
	37	{ register unsigned char op = read_memory_integer (pc, 1); \
	38	if (op == 0x82) { op = read_memory_integer (pc+2,1); \
	39	if ((op & 0x80) == 0) pc += 3; \
	40	else if ((op & 0xc0) == 0x80) pc += 4; \
	41	else pc += 6; \
	42	} \
	43	}
	44
	45	/* Immediately after a function call, return the saved pc.
	46	Can't always go through the frames for this because on some machines
	47	the new frame is not set up until the new function executes
	48	some instructions. */
	49
	50	#define SAVED_PC_AFTER_CALL(frame) \
	51	read_memory_integer (read_register (SP_REGNUM), 4)
	52
	53	/* Address of end of stack space. */
	54
5d76c8e6	55	#ifndef STACK_END_ADDR
5076de82	56	#define STACK_END_ADDR (0xfffff000)
5d76c8e6	57	#endif
5076de82 FF	58
	59	/* Stack grows downward. */
	60
	61	#define INNER_THAN <
	62
	63	/* Sequence of bytes for breakpoint instruction. */
	64
	65	#define BREAKPOINT {0xf2}
	66
	67	/* Amount PC must be decremented by after a breakpoint.
	68	This is often the number of bytes in BREAKPOINT
	69	but not always. */
	70
	71	#define DECR_PC_AFTER_BREAK 0
	72
	73	/* Nonzero if instruction at PC is a return instruction. */
	74
	75	#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
	76
ac57e5ad	77	#if 0 /* Disable until fixed correctly. */
5d76c8e6	78	#ifndef INVALID_FLOAT
5076de82 FF	79	#ifndef NaN
	80	#include <nan.h>
	81	#endif NaN
	82
	83	/* Return 1 if P points to an invalid floating point value. */
	84	/* Surely wrong for cross-debugging. */
	85	#define INVALID_FLOAT(p, s) \
	86	((s == sizeof (float))? \
	87	NaF ((float ) p) : \
	88	NaD ((double ) p))
5d76c8e6	89	#endif /* INVALID_FLOAT */
ac57e5ad	90	#endif
5076de82	91
f4f0d174 JK	92	/* Say how long (ordinary) registers are. This is a piece of bogosity
	93	used in push_word and a few other places; REGISTER_RAW_SIZE is the
	94	real way to know how big a register is. */
5076de82	95
f4f0d174	96	#define REGISTER_SIZE 4
5076de82 FF	97
	98	/* Number of machine registers */
	99
	100	#define NUM_REGS 25
	101
	102	#define NUM_GENERAL_REGS 8
	103
	104	/* Initializer for an array of names of registers.
	105	There should be NUM_REGS strings in this initializer. */
	106
	107	#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
	108	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
	109	"sp", "fp", "pc", "ps", \
	110	"fsr", \
	111	"l0", "l1", "l2", "l3", "xx", \
	112	}
	113
	114	/* Register numbers of various important registers.
	115	Note that some of these values are "real" register numbers,
	116	and correspond to the general registers of the machine,
	117	and some are "phony" register numbers which are too large
	118	to be actual register numbers as far as the user is concerned
	119	but do serve to get the desired values when passed to read_register. */
	120
	121	#define R0_REGNUM 0 /* General register 0 */
	122	#define FP0_REGNUM 8 /* Floating point register 0 */
	123	#define SP_REGNUM 16 /* Contains address of top of stack */
	124	#define AP_REGNUM FP_REGNUM
	125	#define FP_REGNUM 17 /* Contains address of executing stack frame */
	126	#define PC_REGNUM 18 /* Contains program counter */
	127	#define PS_REGNUM 19 /* Contains processor status */
	128	#define FPS_REGNUM 20 /* Floating point status register */
	129	#define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
	130
	131	/* Total amount of space needed to store our copies of the machine's
	132	register state, the array `registers'. */
	133	#define REGISTER_BYTES \
	134	((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
	135	+ 4 * REGISTER_RAW_SIZE(LP0_REGNUM))
	136
	137	/* Index within `registers' of the first byte of the space for
	138	register N. */
	139
	140	#define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
	141	LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
	142
	143	/* Number of bytes of storage in the actual machine representation
	144	for register N. On the 32000, all regs are 4 bytes
	145	except for the doubled floating registers. */
	146
	147	#define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
	148
	149	/* Number of bytes of storage in the program's representation
	150	for register N. On the 32000, all regs are 4 bytes
	151	except for the doubled floating registers. */
	152
	153	#define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
	154
	155	/* Largest value REGISTER_RAW_SIZE can have. */
	156
	157	#define MAX_REGISTER_RAW_SIZE 8
	158
	159	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
	160
161	#define MAX_REGISTER_VIRTUAL_SIZE 8
162
5076de82 FF	163	/* Return the GDB type object for the "standard" data type
	164	of data in register N. */
	165
	166	#define REGISTER_VIRTUAL_TYPE(N) \
	167	(((N) < FP0_REGNUM) ? \
	168	builtin_type_int : \
	169	((N) < FP0_REGNUM + 8) ? \
	170	builtin_type_float : \
	171	((N) < LP0_REGNUM) ? \
	172	builtin_type_int : \
	173	builtin_type_double)
	174
	175	/* Store the address of the place in which to copy the structure the
	176	subroutine will return. This is called from call_function.
	177
	178	On this machine this is a no-op, because gcc isn't used on it
	179	yet. So this calling convention is not used. */
	180
	181	#define STORE_STRUCT_RETURN(ADDR, SP)
	182
	183	/* Extract from an array REGBUF containing the (raw) register state
	184	a function return value of type TYPE, and copy that, in virtual format,
	185	into VALBUF. */
	186
	187	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
ade40d31	188	memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE))
5076de82 FF	189
	190	/* Write into appropriate registers a function return value
	191	of type TYPE, given in virtual format. */
	192
	193	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
	194	write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
	195
	196	/* Extract from an array REGBUF containing the (raw) register state
	197	the address in which a function should return its structure value,
	198	as a CORE_ADDR (or an expression that can be used as one). */
	199
	200	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((int )(REGBUF))
	201	\f
	202	/* Describe the pointer in each stack frame to the previous stack frame
	203	(its caller). */
	204
	205	/* FRAME_CHAIN takes a frame's nominal address
	206	and produces the frame's chain-pointer. */
	207
	208	/* In the case of the ns32000 series, the frame's nominal address is the FP
	209	value, and at that address is saved previous FP value as a 4-byte word. */
	210
	211	#define FRAME_CHAIN(thisframe) \
	212	(!inside_entry_file ((thisframe)->pc) ? \
	213	read_memory_integer ((thisframe)->frame, 4) :\
	214	0)
	215
	216	/* Define other aspects of the stack frame. */
	217
	218	#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
	219
	220	/* Compute base of arguments. */
	221
	222	#define FRAME_ARGS_ADDRESS(fi) \
	223	((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
	224	((fi)->frame) : (read_register (SP_REGNUM) - 4))
	225
	226	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
	227
	228	/* Get the address of the enter opcode for this function, if it is active.
	229	Returns positive address > 1 if pc is between enter/exit,
	230	1 if pc before enter or after exit, 0 otherwise. */
	231
	232	extern CORE_ADDR ns32k_get_enter_addr ();
	233
	234	/* Return number of args passed to a frame.
	235	Can return -1, meaning no way to tell.
	236	Encore's C compiler often reuses same area on stack for args,
	237	so this will often not work properly. If the arg names
	238	are known, it's likely most of them will be printed. */
	239
	240	#define FRAME_NUM_ARGS(numargs, fi) \
	241	{ CORE_ADDR pc; \
	242	CORE_ADDR enter_addr; \
	243	unsigned int insn; \
	244	unsigned int addr_mode; \
	245	int width; \
	246	\
	247	numargs = -1; \
	248	enter_addr = ns32k_get_enter_addr ((fi)->pc); \
	249	if (enter_addr > 0) \
	250	{ \
	251	pc = (enter_addr == 1) ? \
	252	SAVED_PC_AFTER_CALL (fi) : \
253	FRAME_SAVED_PC (fi); \
254	insn = read_memory_integer (pc,2); \
255	addr_mode = (insn >> 11) & 0x1f; \
256	insn = insn & 0x7ff; \
257	if ((insn & 0x7fc) == 0x57c && \
258	addr_mode == 0x14) /* immediate */ \
259	{ \
260	if (insn == 0x57c) /* adjspb */ \
261	width = 1; \
262	else if (insn == 0x57d) /* adjspw */ \
263	width = 2; \
264	else if (insn == 0x57f) /* adjspd */ \
265	width = 4; \
266	numargs = read_memory_integer (pc+2,width); \
267	if (width > 1) \
268	flip_bytes (&numargs, width); \
269	numargs = - sign_extend (numargs, width*8) / 4;\
270	} \
271	} \
272	}
273
274	/* Return number of bytes at start of arglist that are not really args. */
275
276	#define FRAME_ARGS_SKIP 8
277
278	/* Put here the code to store, into a struct frame_saved_regs,
279	the addresses of the saved registers of frame described by FRAME_INFO.
280	This includes special registers such as pc and fp saved in special
281	ways in the stack frame. sp is even more special:
282	the address we return for it IS the sp for the next frame. */
283
284	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
285	{ \
286	register int regmask, regnum; \
287	int localcount; \
288	register CORE_ADDR enter_addr; \
289	register CORE_ADDR next_addr; \
290	\
4ed97c9a	291	memset (&(frame_saved_regs), '\0', sizeof (frame_saved_regs)); \
5076de82 FF	292	enter_addr = ns32k_get_enter_addr ((frame_info)->pc); \
	293	if (enter_addr > 1) \
	294	{ \
	295	regmask = read_memory_integer (enter_addr+1, 1) & 0xff; \
	296	localcount = ns32k_localcount (enter_addr); \
	297	next_addr = (frame_info)->frame + localcount; \
	298	for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
	299	(frame_saved_regs).regs[regnum] = (regmask & 1) ? \
	300	(next_addr -= 4) : 0; \
	301	(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
	302	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
	303	(frame_saved_regs).regs[FP_REGNUM] = \
	304	(read_memory_integer ((frame_info)->frame, 4));\
	305	} \
	306	else if (enter_addr == 1) \
	307	{ \
	308	CORE_ADDR sp = read_register (SP_REGNUM); \
	309	(frame_saved_regs).regs[PC_REGNUM] = sp; \
	310	(frame_saved_regs).regs[SP_REGNUM] = sp + 4; \
	311	} \
	312	}
	313	\f
	314	/* Things needed for making the inferior call functions. */
	315
	316	/* Push an empty stack frame, to record the current PC, etc. */
	317
	318	#define PUSH_DUMMY_FRAME \
	319	{ register CORE_ADDR sp = read_register (SP_REGNUM);\
	320	register int regnum; \
	321	sp = push_word (sp, read_register (PC_REGNUM)); \
	322	sp = push_word (sp, read_register (FP_REGNUM)); \
	323	write_register (FP_REGNUM, sp); \
	324	for (regnum = 0; regnum < 8; regnum++) \
	325	sp = push_word (sp, read_register (regnum)); \
	326	write_register (SP_REGNUM, sp); \
	327	}
	328
	329	/* Discard from the stack the innermost frame, restoring all registers. */
	330
	331	#define POP_FRAME \
669caa9c	332	{ register struct frame_info *frame = get_current_frame (); \
5076de82 FF	333	register CORE_ADDR fp; \
	334	register int regnum; \
	335	struct frame_saved_regs fsr; \
	336	struct frame_info *fi; \
669caa9c SS	337	fp = frame->frame; \
669caa9c SS	338	get_frame_saved_regs (frame, &fsr); \
5076de82 FF	339	for (regnum = 0; regnum < 8; regnum++) \
	340	if (fsr.regs[regnum]) \
	341	write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
	342	write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
	343	write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
	344	write_register (SP_REGNUM, fp + 8); \
	345	flush_cached_frames (); \
16726dd1	346	}
5076de82 FF	347
	348	/* This sequence of words is the instructions
	349	enter 0xff,0 82 ff 00
	350	jsr @0x00010203 7f ae c0 01 02 03
	351	adjspd 0x69696969 7f a5 01 02 03 04
	352	bpt f2
	353	Note this is 16 bytes. */
	354
	355	#define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
	356
	357	#define CALL_DUMMY_START_OFFSET 3
	358	#define CALL_DUMMY_LENGTH 16
	359	#define CALL_DUMMY_ADDR 5
	360	#define CALL_DUMMY_NARGS 11
	361
	362	/* Insert the specified number of args and function address
	363	into a call sequence of the above form stored at DUMMYNAME. */
	364
	365	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
	366	{ \
	367	int flipped; \
	368	flipped = fun \| 0xc0000000; \
	369	flip_bytes (&flipped, 4); \
	370	((int ) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
	371	flipped = - nargs * 4; \
	372	flip_bytes (&flipped, 4); \
	373	((int ) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
	374	}