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

/* Definitions to make GDB run on an encore under umax 4.2
   Copyright (C) 1987, 1989 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.  */

#define TARGET_BYTE_ORDER LITTLE_ENDIAN

/* Define this if the C compiler puts an underscore at the front
   of external names before giving them to the linker.  */

#define NAMES_HAVE_UNDERSCORE

/* Exec files and symbol tables are in COFF format */

#define COFF_FORMAT

/* 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.  */

#define STACK_END_ADDR (0xfffff000)

/* 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)

#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))

/* Say how long (ordinary) registers are.  */

#define REGISTER_TYPE long

/* 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 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) * sizeof (int) + 4 * sizeof (double))

/* 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

/* Nonzero if register N requires conversion
   from raw format to virtual format.  */

#define REGISTER_CONVERTIBLE(N) 0

/* Convert data from raw format for register REGNUM
   to virtual format for register REGNUM.  */

#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)	\
  bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));

/* Convert data from virtual format for register REGNUM
   to raw format for register REGNUM.  */

#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)	\
  bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));

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

   FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
   and produces the nominal address of the caller frame.

   However, if FRAME_CHAIN_VALID returns zero,
   it means the given frame is the outermost one and has no caller.
   In that case, FRAME_CHAIN_COMBINE is not used.  */

/* 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)  \
  (outside_startup_file ((thisframe)->pc) ? \
   read_memory_integer ((thisframe)->frame, 4) :\
   0)

#define FRAME_CHAIN_VALID(chain, thisframe) \
  (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))

#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)

/* 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. */

#ifndef CORE_ADDR
#include "defs.h"   /* Make sure CORE_ADDR is defined.  */
#endif

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;				\
								\
  bzero (&(frame_saved_regs), 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 FRAME frame = get_current_frame ();			 \
  register CORE_ADDR fp;					 \
  register int regnum;						 \
  struct frame_saved_regs fsr;					 \
  struct frame_info *fi;						 \
  fi = get_frame_info (frame);					 \
  fp = fi->frame;						 \
  get_frame_saved_regs (fi, &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 ();					 \
  set_current_frame (create_new_frame (read_register (FP_REGNUM),\
				       read_pc ())); }

/* 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
dd3b648e RP	1	/* Definitions to make GDB run on an encore under umax 4.2
	2	Copyright (C) 1987, 1989 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
99a7de40	6	This program is free software; you can redistribute it and/or modify
dd3b648e	7	it under the terms of the GNU General Public License as published by
99a7de40 JG	8	the Free Software Foundation; either version 2 of the License, or
99a7de40 JG	9	(at your option) any later version.
dd3b648e	10
99a7de40	11	This program is distributed in the hope that it will be useful,
dd3b648e RP	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
99a7de40 JG	17	along with this program; if not, write to the Free Software
99a7de40 JG	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
dd3b648e RP	19
	20	#define TARGET_BYTE_ORDER LITTLE_ENDIAN
	21
	22	/* Define this if the C compiler puts an underscore at the front
	23	of external names before giving them to the linker. */
	24
	25	#define NAMES_HAVE_UNDERSCORE
	26
	27	/* Exec files and symbol tables are in COFF format */
	28
	29	#define COFF_FORMAT
	30
	31	/* Need to get function ends by adding this to epilogue address from .bf
	32	record, not using x_fsize field. */
	33	#define FUNCTION_EPILOGUE_SIZE 4
	34
	35	/* Offset from address of function to start of its code.
	36	Zero on most machines. */
	37
	38	#define FUNCTION_START_OFFSET 0
	39
	40	/* Advance PC across any function entry prologue instructions
	41	to reach some "real" code. */
	42
	43	#define SKIP_PROLOGUE(pc) \
	44	{ register unsigned char op = read_memory_integer (pc, 1); \
	45	if (op == 0x82) { op = read_memory_integer (pc+2,1); \
	46	if ((op & 0x80) == 0) pc += 3; \
	47	else if ((op & 0xc0) == 0x80) pc += 4; \
	48	else pc += 6; \
	49	} \
	50	}
	51
	52	/* Immediately after a function call, return the saved pc.
	53	Can't always go through the frames for this because on some machines
	54	the new frame is not set up until the new function executes
	55	some instructions. */
	56
	57	#define SAVED_PC_AFTER_CALL(frame) \
	58	read_memory_integer (read_register (SP_REGNUM), 4)
	59
	60	/* Address of end of stack space. */
	61
	62	#define STACK_END_ADDR (0xfffff000)
	63
	64	/* Stack grows downward. */
	65
	66	#define INNER_THAN <
	67
	68	/* Sequence of bytes for breakpoint instruction. */
	69
	70	#define BREAKPOINT {0xf2}
	71
	72	/* Amount PC must be decremented by after a breakpoint.
	73	This is often the number of bytes in BREAKPOINT
	74	but not always. */
	75
	76	#define DECR_PC_AFTER_BREAK 0
	77
	78	/* Nonzero if instruction at PC is a return instruction. */
	79
	80	#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
	81
	82	#ifndef NaN
83	#include <nan.h>
84	#endif NaN
85
86	/* Return 1 if P points to an invalid floating point value. */
87	/* Surely wrong for cross-debugging. */
88	#define INVALID_FLOAT(p, s) \
89	((s == sizeof (float))? \
90	NaF ((float ) p) : \
91	NaD ((double ) p))
92
93	/* Say how long (ordinary) registers are. */
94
95	#define REGISTER_TYPE long
96
97	/* Number of machine registers */
98
99	#define NUM_REGS 25
100
101	#define NUM_GENERAL_REGS 8
102
103	/* Initializer for an array of names of registers.
104	There should be NUM_REGS strings in this initializer. */
105
106	#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
107	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
108	"sp", "fp", "pc", "ps", \
109	"fsr", \
110	"l0", "l1", "l2", "l3", "xx", \
111	}
112
113	/* Register numbers of various important registers.
114	Note that some of these values are "real" register numbers,
115	and correspond to the general registers of the machine,
116	and some are "phony" register numbers which are too large
117	to be actual register numbers as far as the user is concerned
118	but do serve to get the desired values when passed to read_register. */
119
120	#define FP0_REGNUM 8 /* Floating point register 0 */
121	#define SP_REGNUM 16 /* Contains address of top of stack */
122	#define AP_REGNUM FP_REGNUM
123	#define FP_REGNUM 17 /* Contains address of executing stack frame */
124	#define PC_REGNUM 18 /* Contains program counter */
125	#define PS_REGNUM 19 /* Contains processor status */
126	#define FPS_REGNUM 20 /* Floating point status register */
127	#define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
128
129	/* Total amount of space needed to store our copies of the machine's
130	register state, the array `registers'. */
131	#define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
132
133	/* Index within `registers' of the first byte of the space for
134	register N. */
135
136	#define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
137	LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
138
139	/* Number of bytes of storage in the actual machine representation
140	for register N. On the 32000, all regs are 4 bytes
141	except for the doubled floating registers. */
142
143	#define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
144
145	/* Number of bytes of storage in the program's representation
146	for register N. On the 32000, all regs are 4 bytes
147	except for the doubled floating registers. */
148
149	#define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
150
151	/* Largest value REGISTER_RAW_SIZE can have. */
152
153	#define MAX_REGISTER_RAW_SIZE 8
154
155	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
156
157	#define MAX_REGISTER_VIRTUAL_SIZE 8
158
159	/* Nonzero if register N requires conversion
160	from raw format to virtual format. */
161
162	#define REGISTER_CONVERTIBLE(N) 0
163
164	/* Convert data from raw format for register REGNUM
165	to virtual format for register REGNUM. */
166
167	#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
168	bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
169
170	/* Convert data from virtual format for register REGNUM
171	to raw format for register REGNUM. */
172
173	#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
174	bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
175
176	/* Return the GDB type object for the "standard" data type
177	of data in register N. */
178
179	#define REGISTER_VIRTUAL_TYPE(N) \
180	(((N) < FP0_REGNUM) ? \
181	builtin_type_int : \
182	((N) < FP0_REGNUM + 8) ? \
183	builtin_type_float : \
184	((N) < LP0_REGNUM) ? \
185	builtin_type_int : \
186	builtin_type_double)
187
188	/* Store the address of the place in which to copy the structure the
189	subroutine will return. This is called from call_function.
190
191	On this machine this is a no-op, because gcc isn't used on it
192	yet. So this calling convention is not used. */
193
194	#define STORE_STRUCT_RETURN(ADDR, SP)
195
196	/* Extract from an array REGBUF containing the (raw) register state
197	a function return value of type TYPE, and copy that, in virtual format,
198	into VALBUF. */
199
200	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
201	bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
202
203	/* Write into appropriate registers a function return value
204	of type TYPE, given in virtual format. */
205
206	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
207	write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
208
209	/* Extract from an array REGBUF containing the (raw) register state
210	the address in which a function should return its structure value,
211	as a CORE_ADDR (or an expression that can be used as one). */
212
213	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((int )(REGBUF))
214	\f
215	/* Describe the pointer in each stack frame to the previous stack frame
216	(its caller). */
217
218	/* FRAME_CHAIN takes a frame's nominal address
219	and produces the frame's chain-pointer.
220
221	FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
222	and produces the nominal address of the caller frame.
223
224	However, if FRAME_CHAIN_VALID returns zero,
225	it means the given frame is the outermost one and has no caller.
226	In that case, FRAME_CHAIN_COMBINE is not used. */
227
228	/* In the case of the ns32000 series, the frame's nominal address is the FP
229	value, and at that address is saved previous FP value as a 4-byte word. */
230
231	#define FRAME_CHAIN(thisframe) \
232	(outside_startup_file ((thisframe)->pc) ? \
233	read_memory_integer ((thisframe)->frame, 4) :\
234	0)
235
236	#define FRAME_CHAIN_VALID(chain, thisframe) \
237	(chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
238
239	#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
240
241	/* Define other aspects of the stack frame. */
242
243	#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
244
245	/* Compute base of arguments. */
246
247	#define FRAME_ARGS_ADDRESS(fi) \
248	((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
249	((fi)->frame) : (read_register (SP_REGNUM) - 4))
250
251	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
252
253	/* Get the address of the enter opcode for this function, if it is active.
254	Returns positive address > 1 if pc is between enter/exit,
255	1 if pc before enter or after exit, 0 otherwise. */
256
257	#ifndef CORE_ADDR
258	#include "defs.h" /* Make sure CORE_ADDR is defined. */
259	#endif
260
261	extern CORE_ADDR ns32k_get_enter_addr ();
262
263	/* Return number of args passed to a frame.
264	Can return -1, meaning no way to tell.
265	Encore's C compiler often reuses same area on stack for args,
266	so this will often not work properly. If the arg names
267	are known, it's likely most of them will be printed. */
268
269	#define FRAME_NUM_ARGS(numargs, fi) \
270	{ CORE_ADDR pc; \
271	CORE_ADDR enter_addr; \
272	unsigned int insn; \
273	unsigned int addr_mode; \
274	int width; \
275	\
276	numargs = -1; \
277	enter_addr = ns32k_get_enter_addr ((fi)->pc); \
278	if (enter_addr > 0) \
279	{ \
280	pc = (enter_addr == 1) ? \
281	SAVED_PC_AFTER_CALL (fi) : \
282	FRAME_SAVED_PC (fi); \
283	insn = read_memory_integer (pc,2); \
284	addr_mode = (insn >> 11) & 0x1f; \
285	insn = insn & 0x7ff; \
286	if ((insn & 0x7fc) == 0x57c && \
287	addr_mode == 0x14) /* immediate */ \
288	{ \
289	if (insn == 0x57c) /* adjspb */ \
290	width = 1; \
291	else if (insn == 0x57d) /* adjspw */ \
292	width = 2; \
293	else if (insn == 0x57f) /* adjspd */ \
294	width = 4; \
295	numargs = read_memory_integer (pc+2,width); \
296	if (width > 1) \
297	flip_bytes (&numargs, width); \
298	numargs = - sign_extend (numargs, width*8) / 4;\
299	} \
300	} \
301	}
302
303	/* Return number of bytes at start of arglist that are not really args. */
304
305	#define FRAME_ARGS_SKIP 8
306
307	/* Put here the code to store, into a struct frame_saved_regs,
308	the addresses of the saved registers of frame described by FRAME_INFO.
309	This includes special registers such as pc and fp saved in special
310	ways in the stack frame. sp is even more special:
311	the address we return for it IS the sp for the next frame. */
312
313	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
314	{ \
315	register int regmask, regnum; \
316	int localcount; \
317	register CORE_ADDR enter_addr; \
318	register CORE_ADDR next_addr; \
319	\
320	bzero (&(frame_saved_regs), sizeof (frame_saved_regs)); \
321	enter_addr = ns32k_get_enter_addr ((frame_info)->pc); \
322	if (enter_addr > 1) \
323	{ \
324	regmask = read_memory_integer (enter_addr+1, 1) & 0xff; \
325	localcount = ns32k_localcount (enter_addr); \
326	next_addr = (frame_info)->frame + localcount; \
327	for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
328	(frame_saved_regs).regs[regnum] = (regmask & 1) ? \
329	(next_addr -= 4) : 0; \
330	(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
331	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
332	(frame_saved_regs).regs[FP_REGNUM] = \
333	(read_memory_integer ((frame_info)->frame, 4));\
334	} \
335	else if (enter_addr == 1) \
336	{ \
337	CORE_ADDR sp = read_register (SP_REGNUM); \
338	(frame_saved_regs).regs[PC_REGNUM] = sp; \
339	(frame_saved_regs).regs[SP_REGNUM] = sp + 4; \
340	} \
341	}
342	\f
343	/* Things needed for making the inferior call functions. */
344
345	/* Push an empty stack frame, to record the current PC, etc. */
346
347	#define PUSH_DUMMY_FRAME \
348	{ register CORE_ADDR sp = read_register (SP_REGNUM);\
349	register int regnum; \
350	sp = push_word (sp, read_register (PC_REGNUM)); \
351	sp = push_word (sp, read_register (FP_REGNUM)); \
352	write_register (FP_REGNUM, sp); \
353	for (regnum = 0; regnum < 8; regnum++) \
354	sp = push_word (sp, read_register (regnum)); \
355	write_register (SP_REGNUM, sp); \
356	}
357
358	/* Discard from the stack the innermost frame, restoring all registers. */
359
360	#define POP_FRAME \
361	{ register FRAME frame = get_current_frame (); \
362	register CORE_ADDR fp; \
363	register int regnum; \
364	struct frame_saved_regs fsr; \
365	struct frame_info *fi; \
366	fi = get_frame_info (frame); \
367	fp = fi->frame; \
368	get_frame_saved_regs (fi, &fsr); \
369	for (regnum = 0; regnum < 8; regnum++) \
370	if (fsr.regs[regnum]) \
371	write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
372	write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
373	write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
374	write_register (SP_REGNUM, fp + 8); \
375	flush_cached_frames (); \
376	set_current_frame (create_new_frame (read_register (FP_REGNUM),\
377	read_pc ())); }
378
379	/* This sequence of words is the instructions
380	enter 0xff,0 82 ff 00
381	jsr @0x00010203 7f ae c0 01 02 03
382	adjspd 0x69696969 7f a5 01 02 03 04
383	bpt f2
384	Note this is 16 bytes. */
385
386	#define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
387
388	#define CALL_DUMMY_START_OFFSET 3
389	#define CALL_DUMMY_LENGTH 16
390	#define CALL_DUMMY_ADDR 5
391	#define CALL_DUMMY_NARGS 11
392
393	/* Insert the specified number of args and function address
394	into a call sequence of the above form stored at DUMMYNAME. */
395
396	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
397	{ \
398	int flipped; \
399	flipped = fun \| 0xc0000000; \
400	flip_bytes (&flipped, 4); \
401	((int ) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
402	flipped = - nargs * 4; \
403	flip_bytes (&flipped, 4); \
404	((int ) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
405	}