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

/* Definitions to make GDB run on an encore under umax 4.2
   Copyright (C) 1987, 1989, 1991 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

/* 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	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

/* 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. */

/* 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;				\
								\
  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	1	/* Definitions to make GDB run on an encore under umax 4.2
fbcb5095	2	Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
dd3b648e RP	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
dd3b648e RP	27	/* Need to get function ends by adding this to epilogue address from .bf
	28	record, not using x_fsize field. */
	29	#define FUNCTION_EPILOGUE_SIZE 4
	30
	31	/* Offset from address of function to start of its code.
	32	Zero on most machines. */
	33
	34	#define FUNCTION_START_OFFSET 0
	35
	36	/* Advance PC across any function entry prologue instructions
	37	to reach some "real" code. */
	38
	39	#define SKIP_PROLOGUE(pc) \
	40	{ register unsigned char op = read_memory_integer (pc, 1); \
	41	if (op == 0x82) { op = read_memory_integer (pc+2,1); \
	42	if ((op & 0x80) == 0) pc += 3; \
	43	else if ((op & 0xc0) == 0x80) pc += 4; \
	44	else pc += 6; \
	45	} \
	46	}
	47
	48	/* Immediately after a function call, return the saved pc.
	49	Can't always go through the frames for this because on some machines
	50	the new frame is not set up until the new function executes
	51	some instructions. */
	52
	53	#define SAVED_PC_AFTER_CALL(frame) \
	54	read_memory_integer (read_register (SP_REGNUM), 4)
	55
	56	/* Address of end of stack space. */
	57
	58	#define STACK_END_ADDR (0xfffff000)
	59
	60	/* Stack grows downward. */
	61
	62	#define INNER_THAN <
	63
	64	/* Sequence of bytes for breakpoint instruction. */
	65
	66	#define BREAKPOINT {0xf2}
	67
	68	/* Amount PC must be decremented by after a breakpoint.
	69	This is often the number of bytes in BREAKPOINT
	70	but not always. */
	71
	72	#define DECR_PC_AFTER_BREAK 0
	73
	74	/* Nonzero if instruction at PC is a return instruction. */
	75
	76	#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
	77
	78	#ifndef NaN
	79	#include <nan.h>
	80	#endif NaN
	81
	82	/* Return 1 if P points to an invalid floating point value. */
	83	/* Surely wrong for cross-debugging. */
	84	#define INVALID_FLOAT(p, s) \
	85	((s == sizeof (float))? \
	86	NaF ((float ) p) : \
	87	NaD ((double ) p))
	88
	89	/* Say how long (ordinary) registers are. */
	90
91	#define REGISTER_TYPE long
92
93	/* Number of machine registers */
94
95	#define NUM_REGS 25
96
97	#define NUM_GENERAL_REGS 8
98
99	/* Initializer for an array of names of registers.
100	There should be NUM_REGS strings in this initializer. */
101
102	#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
103	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
104	"sp", "fp", "pc", "ps", \
105	"fsr", \
106	"l0", "l1", "l2", "l3", "xx", \
107	}
108
109	/* Register numbers of various important registers.
110	Note that some of these values are "real" register numbers,
111	and correspond to the general registers of the machine,
112	and some are "phony" register numbers which are too large
113	to be actual register numbers as far as the user is concerned
114	but do serve to get the desired values when passed to read_register. */
115
6ad6ef42	116	#define R0_REGNUM 0 /* General register 0 */
dd3b648e RP	117	#define FP0_REGNUM 8 /* Floating point register 0 */
	118	#define SP_REGNUM 16 /* Contains address of top of stack */
	119	#define AP_REGNUM FP_REGNUM
	120	#define FP_REGNUM 17 /* Contains address of executing stack frame */
	121	#define PC_REGNUM 18 /* Contains program counter */
	122	#define PS_REGNUM 19 /* Contains processor status */
	123	#define FPS_REGNUM 20 /* Floating point status register */
	124	#define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
	125
	126	/* Total amount of space needed to store our copies of the machine's
	127	register state, the array `registers'. */
6ad6ef42 JG	128	#define REGISTER_BYTES \
	129	((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
	130	+ 4 * REGISTER_RAW_SIZE(LP0_REGNUM))
dd3b648e RP	131
	132	/* Index within `registers' of the first byte of the space for
	133	register N. */
	134
	135	#define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
	136	LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
	137
	138	/* Number of bytes of storage in the actual machine representation
	139	for register N. On the 32000, all regs are 4 bytes
	140	except for the doubled floating registers. */
	141
	142	#define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
	143
	144	/* Number of bytes of storage in the program's representation
	145	for register N. On the 32000, all regs are 4 bytes
	146	except for the doubled floating registers. */
	147
	148	#define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
	149
	150	/* Largest value REGISTER_RAW_SIZE can have. */
	151
	152	#define MAX_REGISTER_RAW_SIZE 8
	153
	154	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
	155
	156	#define MAX_REGISTER_VIRTUAL_SIZE 8
	157
	158	/* Nonzero if register N requires conversion
	159	from raw format to virtual format. */
	160
	161	#define REGISTER_CONVERTIBLE(N) 0
	162
	163	/* Convert data from raw format for register REGNUM
	164	to virtual format for register REGNUM. */
	165
	166	#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
	167	bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
	168
	169	/* Convert data from virtual format for register REGNUM
	170	to raw format for register REGNUM. */
	171
	172	#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
	173	bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
	174
	175	/* Return the GDB type object for the "standard" data type
	176	of data in register N. */
	177
	178	#define REGISTER_VIRTUAL_TYPE(N) \
	179	(((N) < FP0_REGNUM) ? \
	180	builtin_type_int : \
	181	((N) < FP0_REGNUM + 8) ? \
	182	builtin_type_float : \
	183	((N) < LP0_REGNUM) ? \
	184	builtin_type_int : \
	185	builtin_type_double)
	186
	187	/* Store the address of the place in which to copy the structure the
	188	subroutine will return. This is called from call_function.
	189
	190	On this machine this is a no-op, because gcc isn't used on it
	191	yet. So this calling convention is not used. */
	192
	193	#define STORE_STRUCT_RETURN(ADDR, SP)
	194
195	/* Extract from an array REGBUF containing the (raw) register state
196	a function return value of type TYPE, and copy that, in virtual format,
197	into VALBUF. */
198
199	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
200	bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
201
202	/* Write into appropriate registers a function return value
203	of type TYPE, given in virtual format. */
204
205	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
206	write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
207
208	/* Extract from an array REGBUF containing the (raw) register state
209	the address in which a function should return its structure value,
210	as a CORE_ADDR (or an expression that can be used as one). */
211
212	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((int )(REGBUF))
213	\f
214	/* Describe the pointer in each stack frame to the previous stack frame
215	(its caller). */
216
217	/* FRAME_CHAIN takes a frame's nominal address
5e2e79f8	218	and produces the frame's chain-pointer. */
dd3b648e RP	219
	220	/* In the case of the ns32000 series, the frame's nominal address is the FP
	221	value, and at that address is saved previous FP value as a 4-byte word. */
	222
	223	#define FRAME_CHAIN(thisframe) \
5e2e79f8	224	(!inside_entry_file ((thisframe)->pc) ? \
dd3b648e RP	225	read_memory_integer ((thisframe)->frame, 4) :\
	226	0)
	227
dd3b648e RP	228	/* Define other aspects of the stack frame. */
	229
	230	#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
	231
	232	/* Compute base of arguments. */
	233
	234	#define FRAME_ARGS_ADDRESS(fi) \
	235	((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
	236	((fi)->frame) : (read_register (SP_REGNUM) - 4))
	237
	238	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
	239
	240	/* Get the address of the enter opcode for this function, if it is active.
	241	Returns positive address > 1 if pc is between enter/exit,
	242	1 if pc before enter or after exit, 0 otherwise. */
	243
dd3b648e RP	244	extern CORE_ADDR ns32k_get_enter_addr ();
	245
	246	/* Return number of args passed to a frame.
	247	Can return -1, meaning no way to tell.
	248	Encore's C compiler often reuses same area on stack for args,
	249	so this will often not work properly. If the arg names
	250	are known, it's likely most of them will be printed. */
	251
	252	#define FRAME_NUM_ARGS(numargs, fi) \
	253	{ CORE_ADDR pc; \
	254	CORE_ADDR enter_addr; \
	255	unsigned int insn; \
	256	unsigned int addr_mode; \
	257	int width; \
	258	\
	259	numargs = -1; \
	260	enter_addr = ns32k_get_enter_addr ((fi)->pc); \
	261	if (enter_addr > 0) \
	262	{ \
	263	pc = (enter_addr == 1) ? \
	264	SAVED_PC_AFTER_CALL (fi) : \
	265	FRAME_SAVED_PC (fi); \
	266	insn = read_memory_integer (pc,2); \
	267	addr_mode = (insn >> 11) & 0x1f; \
	268	insn = insn & 0x7ff; \
	269	if ((insn & 0x7fc) == 0x57c && \
	270	addr_mode == 0x14) /* immediate */ \
	271	{ \
	272	if (insn == 0x57c) /* adjspb */ \
	273	width = 1; \
	274	else if (insn == 0x57d) /* adjspw */ \
	275	width = 2; \
	276	else if (insn == 0x57f) /* adjspd */ \
	277	width = 4; \
	278	numargs = read_memory_integer (pc+2,width); \
	279	if (width > 1) \
	280	flip_bytes (&numargs, width); \
	281	numargs = - sign_extend (numargs, width*8) / 4;\
	282	} \
	283	} \
	284	}
	285
	286	/* Return number of bytes at start of arglist that are not really args. */
	287
	288	#define FRAME_ARGS_SKIP 8
	289
	290	/* Put here the code to store, into a struct frame_saved_regs,
	291	the addresses of the saved registers of frame described by FRAME_INFO.
	292	This includes special registers such as pc and fp saved in special
	293	ways in the stack frame. sp is even more special:
	294	the address we return for it IS the sp for the next frame. */
	295
	296	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
	297	{ \
	298	register int regmask, regnum; \
	299	int localcount; \
	300	register CORE_ADDR enter_addr; \
	301	register CORE_ADDR next_addr; \
	302	\
	303	bzero (&(frame_saved_regs), sizeof (frame_saved_regs)); \
	304	enter_addr = ns32k_get_enter_addr ((frame_info)->pc); \
	305	if (enter_addr > 1) \
	306	{ \
	307	regmask = read_memory_integer (enter_addr+1, 1) & 0xff; \
308	localcount = ns32k_localcount (enter_addr); \
309	next_addr = (frame_info)->frame + localcount; \
310	for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
311	(frame_saved_regs).regs[regnum] = (regmask & 1) ? \
312	(next_addr -= 4) : 0; \
313	(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
314	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
315	(frame_saved_regs).regs[FP_REGNUM] = \
316	(read_memory_integer ((frame_info)->frame, 4));\
317	} \
318	else if (enter_addr == 1) \
319	{ \
320	CORE_ADDR sp = read_register (SP_REGNUM); \
321	(frame_saved_regs).regs[PC_REGNUM] = sp; \
322	(frame_saved_regs).regs[SP_REGNUM] = sp + 4; \
323	} \
324	}
325	\f
326	/* Things needed for making the inferior call functions. */
327
328	/* Push an empty stack frame, to record the current PC, etc. */
329
330	#define PUSH_DUMMY_FRAME \
331	{ register CORE_ADDR sp = read_register (SP_REGNUM);\
332	register int regnum; \
333	sp = push_word (sp, read_register (PC_REGNUM)); \
334	sp = push_word (sp, read_register (FP_REGNUM)); \
335	write_register (FP_REGNUM, sp); \
336	for (regnum = 0; regnum < 8; regnum++) \
337	sp = push_word (sp, read_register (regnum)); \
338	write_register (SP_REGNUM, sp); \
339	}
340
341	/* Discard from the stack the innermost frame, restoring all registers. */
342
343	#define POP_FRAME \
344	{ register FRAME frame = get_current_frame (); \
345	register CORE_ADDR fp; \
346	register int regnum; \
347	struct frame_saved_regs fsr; \
348	struct frame_info *fi; \
349	fi = get_frame_info (frame); \
350	fp = fi->frame; \
351	get_frame_saved_regs (fi, &fsr); \
352	for (regnum = 0; regnum < 8; regnum++) \
353	if (fsr.regs[regnum]) \
354	write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
355	write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
356	write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
357	write_register (SP_REGNUM, fp + 8); \
358	flush_cached_frames (); \
359	set_current_frame (create_new_frame (read_register (FP_REGNUM),\
360	read_pc ())); }
361
362	/* This sequence of words is the instructions
363	enter 0xff,0 82 ff 00
364	jsr @0x00010203 7f ae c0 01 02 03
365	adjspd 0x69696969 7f a5 01 02 03 04
366	bpt f2
367	Note this is 16 bytes. */
368
369	#define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
370
371	#define CALL_DUMMY_START_OFFSET 3
372	#define CALL_DUMMY_LENGTH 16
373	#define CALL_DUMMY_ADDR 5
374	#define CALL_DUMMY_NARGS 11
375
376	/* Insert the specified number of args and function address
377	into a call sequence of the above form stored at DUMMYNAME. */
378
379	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
380	{ \
381	int flipped; \
382	flipped = fun \| 0xc0000000; \
383	flip_bytes (&flipped, 4); \
384	((int ) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
385	flipped = - nargs * 4; \
386	flip_bytes (&flipped, 4); \
387	((int ) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
388	}