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

/* Definitions to target GDB to a merlin under utek 2.1
   Copyright 1986, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#define TARGET_BYTE_ORDER LITTLE_ENDIAN

/* 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.  */

extern CORE_ADDR merlin_skip_prologue PARAMS ((CORE_ADDR));
#define SKIP_PROLOGUE(pc) (merlin_skip_prologue (pc))

/* 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 (0x800000)

/* Stack grows downward.  */

#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))

/* 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

/* Define this to say that the "svc" insn is followed by
   codes in memory saying which kind of system call it is.  */

#define NS32K_SVC_IMMED_OPERANDS

/* 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",	\
			"pc", "sp", "fp", "ps",				\
 			"fsr",						\
 			"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",	\
			"l0", "l1", "l2", "l3", "l4",			\
 			}

/* 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 AP_REGNUM FP_REGNUM
#define FP_REGNUM 10		/* Contains address of executing stack frame */
#define SP_REGNUM 9		/* Contains address of top of stack */
#define PC_REGNUM 8		/* Contains program counter */
#define PS_REGNUM 11		/* Contains processor status */
#define FPS_REGNUM 12		/* Floating point status register */
#define FP0_REGNUM 13		/* Floating point register 0 */
#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

/* Return the GDB type object for the "standard" data type
   of data in register N.  */

#define REGISTER_VIRTUAL_TYPE(N) \
  ((N) >= FP0_REGNUM ?		\
    ((N) >= LP0_REGNUM ?	\
     builtin_type_double	\
     : builtin_type_float)	\
   : builtin_type_int)	

/* 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, as gcc doesn't run on it yet.
   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, 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 (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 Merlin, 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) ((fi)->frame)

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

/* Return number of args passed to a frame.
   Can return -1, meaning no way to tell.  */

extern int merlin_frame_num_args PARAMS ((struct frame_info *fi));
#define FRAME_NUM_ARGS(fi) (merlin_frame_num_args ((fi)))

/* 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) \
{ int regmask,regnum;						\
  int localcount;						\
  CORE_ADDR enter_addr;						\
  CORE_ADDR next_addr;						\
								\
  enter_addr = get_pc_function_start ((frame_info)->pc);	\
  regmask = read_memory_integer (enter_addr+1, 1);		\
  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); }

\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 = 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
c906108c SS	1	/* Definitions to target GDB to a merlin under utek 2.1
	2	Copyright 1986, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	19
	20	#define TARGET_BYTE_ORDER LITTLE_ENDIAN
	21
	22	/* Offset from address of function to start of its code.
	23	Zero on most machines. */
	24
	25	#define FUNCTION_START_OFFSET 0
	26
	27	/* Advance PC across any function entry prologue instructions
	28	to reach some "real" code. */
	29
b83266a0 SS	30	extern CORE_ADDR merlin_skip_prologue PARAMS ((CORE_ADDR));
b83266a0 SS	31	#define SKIP_PROLOGUE(pc) (merlin_skip_prologue (pc))
c906108c SS	32
	33	/* Immediately after a function call, return the saved pc.
	34	Can't always go through the frames for this because on some machines
	35	the new frame is not set up until the new function executes
	36	some instructions. */
	37
	38	#define SAVED_PC_AFTER_CALL(frame) \
	39	read_memory_integer (read_register (SP_REGNUM), 4)
	40
	41	/* Address of end of stack space. */
	42
	43	#define STACK_END_ADDR (0x800000)
	44
	45	/* Stack grows downward. */
	46
	47	#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
	48
	49	/* Sequence of bytes for breakpoint instruction. */
	50
	51	#define BREAKPOINT {0xf2}
	52
	53	/* Amount PC must be decremented by after a breakpoint.
	54	This is often the number of bytes in BREAKPOINT
	55	but not always. */
	56
	57	#define DECR_PC_AFTER_BREAK 0
	58
	59	/* Define this to say that the "svc" insn is followed by
	60	codes in memory saying which kind of system call it is. */
	61
	62	#define NS32K_SVC_IMMED_OPERANDS
	63
	64	/* Say how long (ordinary) registers are. This is a piece of bogosity
	65	used in push_word and a few other places; REGISTER_RAW_SIZE is the
	66	real way to know how big a register is. */
	67
	68	#define REGISTER_SIZE 4
	69
	70	/* Number of machine registers */
	71
	72	#define NUM_REGS 25
	73
	74	#define NUM_GENERAL_REGS 8
	75
	76	/* Initializer for an array of names of registers.
	77	There should be NUM_REGS strings in this initializer. */
	78
	79	#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
	80	"pc", "sp", "fp", "ps", \
	81	"fsr", \
	82	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
	83	"l0", "l1", "l2", "l3", "l4", \
	84	}
	85
	86	/* Register numbers of various important registers.
	87	Note that some of these values are "real" register numbers,
	88	and correspond to the general registers of the machine,
	89	and some are "phony" register numbers which are too large
	90	to be actual register numbers as far as the user is concerned
	91	but do serve to get the desired values when passed to read_register. */
	92
	93	#define AP_REGNUM FP_REGNUM
	94	#define FP_REGNUM 10 /* Contains address of executing stack frame */
	95	#define SP_REGNUM 9 /* Contains address of top of stack */
96	#define PC_REGNUM 8 /* Contains program counter */
97	#define PS_REGNUM 11 /* Contains processor status */
98	#define FPS_REGNUM 12 /* Floating point status register */
99	#define FP0_REGNUM 13 /* Floating point register 0 */
100	#define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
101
102	/* Total amount of space needed to store our copies of the machine's
103	register state, the array `registers'. */
104	#define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
105
106	/* Index within `registers' of the first byte of the space for
107	register N. */
108
109	#define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
110	LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
111
112	/* Number of bytes of storage in the actual machine representation
113	for register N. On the 32000, all regs are 4 bytes
114	except for the doubled floating registers. */
115
116	#define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
117
118	/* Number of bytes of storage in the program's representation
119	for register N. On the 32000, all regs are 4 bytes
120	except for the doubled floating registers. */
121
122	#define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
123
124	/* Largest value REGISTER_RAW_SIZE can have. */
125
126	#define MAX_REGISTER_RAW_SIZE 8
127
128	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
129
130	#define MAX_REGISTER_VIRTUAL_SIZE 8
131
132	/* Return the GDB type object for the "standard" data type
133	of data in register N. */
134
135	#define REGISTER_VIRTUAL_TYPE(N) \
136	((N) >= FP0_REGNUM ? \
137	((N) >= LP0_REGNUM ? \
138	builtin_type_double \
139	: builtin_type_float) \
140	: builtin_type_int)
141
142	/* Store the address of the place in which to copy the structure the
143	subroutine will return. This is called from call_function.
144
145	On this machine this is a no-op, as gcc doesn't run on it yet.
146	This calling convention is not used. */
147
148	#define STORE_STRUCT_RETURN(ADDR, SP)
149
150	/* Extract from an array REGBUF containing the (raw) register state
151	a function return value of type TYPE, and copy that, in virtual format,
152	into VALBUF. */
153
154	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
155	memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
156
157	/* Write into appropriate registers a function return value
158	of type TYPE, given in virtual format. */
159
160	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
161	write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
162
163	/* Extract from an array REGBUF containing the (raw) register state
164	the address in which a function should return its structure value,
165	as a CORE_ADDR (or an expression that can be used as one). */
166
167	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((int )(REGBUF))
168	\f
169	/* Describe the pointer in each stack frame to the previous stack frame
170	(its caller). */
171
172	/* FRAME_CHAIN takes a frame's nominal address
173	and produces the frame's chain-pointer. */
174
175	/* In the case of the Merlin, the frame's nominal address is the FP value,
176	and at that address is saved previous FP value as a 4-byte word. */
177
178	#define FRAME_CHAIN(thisframe) \
179	(!inside_entry_file ((thisframe)->pc) ? \
180	read_memory_integer ((thisframe)->frame, 4) :\
181	0)
182
183	/* Define other aspects of the stack frame. */
184
185	#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
186
187	/* compute base of arguments */
188	#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
189
190	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
191
192	/* Return number of args passed to a frame.
193	Can return -1, meaning no way to tell. */
194
392a587b	195	extern int merlin_frame_num_args PARAMS ((struct frame_info *fi));
cce74817	196	#define FRAME_NUM_ARGS(fi) (merlin_frame_num_args ((fi)))
c906108c SS	197
	198	/* Return number of bytes at start of arglist that are not really args. */
	199
	200	#define FRAME_ARGS_SKIP 8
	201
	202	/* Put here the code to store, into a struct frame_saved_regs,
	203	the addresses of the saved registers of frame described by FRAME_INFO.
	204	This includes special registers such as pc and fp saved in special
	205	ways in the stack frame. sp is even more special:
	206	the address we return for it IS the sp for the next frame. */
	207
	208	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
	209	{ int regmask,regnum; \
	210	int localcount; \
	211	CORE_ADDR enter_addr; \
	212	CORE_ADDR next_addr; \
	213	\
	214	enter_addr = get_pc_function_start ((frame_info)->pc); \
	215	regmask = read_memory_integer (enter_addr+1, 1); \
	216	localcount = ns32k_localcount (enter_addr); \
	217	next_addr = (frame_info)->frame + localcount; \
	218	for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
	219	(frame_saved_regs).regs[regnum] \
	220	= (regmask & 1) ? (next_addr -= 4) : 0; \
	221	(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
	222	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
	223	(frame_saved_regs).regs[FP_REGNUM] \
	224	= read_memory_integer ((frame_info)->frame, 4); }
	225
	226	\f
	227	/* Things needed for making the inferior call functions. */
	228
	229	/* Push an empty stack frame, to record the current PC, etc. */
	230
	231	#define PUSH_DUMMY_FRAME \
	232	{ register CORE_ADDR sp = read_register (SP_REGNUM); \
	233	register int regnum; \
	234	sp = push_word (sp, read_register (PC_REGNUM)); \
	235	sp = push_word (sp, read_register (FP_REGNUM)); \
	236	write_register (FP_REGNUM, sp); \
	237	for (regnum = 0; regnum < 8; regnum++) \
	238	sp = push_word (sp, read_register (regnum)); \
	239	write_register (SP_REGNUM, sp); \
	240	}
	241
	242	/* Discard from the stack the innermost frame, restoring all registers. */
	243
	244	#define POP_FRAME \
	245	{ register struct frame_info *frame = get_current_frame (); \
	246	register CORE_ADDR fp; \
	247	register int regnum; \
	248	struct frame_saved_regs fsr; \
	249	struct frame_info *fi; \
	250	fp = frame->frame; \
	251	get_frame_saved_regs (frame, &fsr); \
	252	for (regnum = 0; regnum < 8; regnum++) \
	253	if (fsr.regs[regnum]) \
	254	write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
	255	write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
	256	write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
	257	write_register (SP_REGNUM, fp + 8); \
	258	flush_cached_frames (); \
	259	}
	260
261	/* This sequence of words is the instructions
262	enter 0xff,0 82 ff 00
263	jsr @0x00010203 7f ae c0 01 02 03
264	adjspd 0x69696969 7f a5 01 02 03 04
265	bpt f2
266	Note this is 16 bytes. */
267
268	#define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
269
270	#define CALL_DUMMY_START_OFFSET 3
271	#define CALL_DUMMY_LENGTH 16
272	#define CALL_DUMMY_ADDR 5
273	#define CALL_DUMMY_NARGS 11
274
275	/* Insert the specified number of args and function address
276	into a call sequence of the above form stored at DUMMYNAME. */
277
278	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
279	{ int flipped = fun \| 0xc0000000; \
280	flip_bytes (&flipped, 4); \
281	((int ) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
282	flipped = - nargs * 4; \
283	flip_bytes (&flipped, 4); \
284	((int ) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
285	}