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

/* Definitions to make GDB run on a vax under 4.2bsd.
   Copyright 1986, 1987, 1989, 1991, 1993, 1994, 1996, 1998, 1999, 2000
   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 2

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

extern CORE_ADDR vax_skip_prologue (CORE_ADDR);
#define SKIP_PROLOGUE(pc) (vax_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) FRAME_SAVED_PC(frame)

#define TARGET_UPAGES 14
#define TARGET_NBPG 512
#define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))

/* On the VAX, sigtramp is in the u area.  Can't check the exact
   addresses because for cross-debugging we don't have VAX include
   files around.  This should be close enough.  */
#define SIGTRAMP_START(pc)	STACK_END_ADDR
#define SIGTRAMP_END(pc)	0x80000000

/* Stack grows downward.  */

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

/* Sequence of bytes for breakpoint instruction.  */

#define BREAKPOINT {3}

/* 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

/* Return 1 if P points to an invalid floating point value.
   LEN is the length in bytes -- not relevant on the Vax.  */

#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)

/* 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 17

/* 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", "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", "ps"}

/* 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 12
#define FP_REGNUM 13		/* Contains address of executing stack frame */
#define SP_REGNUM 14		/* Contains address of top of stack */
#define PC_REGNUM 15		/* Contains program counter */
#define PS_REGNUM 16		/* Contains processor status */

/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.  */
#define REGISTER_BYTES (17*4)

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

#define REGISTER_BYTE(N) ((N) * 4)

/* Number of bytes of storage in the actual machine representation
   for register N.  On the vax, all regs are 4 bytes.  */

#define REGISTER_RAW_SIZE(N) 4

/* Number of bytes of storage in the program's representation
   for register N.  On the vax, all regs are 4 bytes.  */

#define REGISTER_VIRTUAL_SIZE(N) 4

/* Largest value REGISTER_RAW_SIZE can have.  */

#define MAX_REGISTER_RAW_SIZE 4

/* Largest value REGISTER_VIRTUAL_SIZE can have.  */

#define MAX_REGISTER_VIRTUAL_SIZE 4

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

#define REGISTER_VIRTUAL_TYPE(N) 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. */

#define STORE_STRUCT_RETURN(ADDR, SP) \
  { write_register (1, (ADDR)); }

/* 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 Vax, the frame's nominal address is the FP value,
   and 12 bytes later comes the saved previous FP value as a 4-byte word.  */

#define FRAME_CHAIN(thisframe)  \
  (!inside_entry_file ((thisframe)->pc) ? \
   read_memory_integer ((thisframe)->frame + 12, 4) :\
   0)

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

/* A macro that tells us whether the function invocation represented
   by FI does not have a frame on the stack associated with it.  If it
   does not, FRAMELESS is set to 1, else 0.  */
/* On the vax, all functions have frames.  */
#define FRAMELESS_FUNCTION_INVOCATION(FI)  (0)

/* Saved Pc.  Get it from sigcontext if within sigtramp.  */

/* Offset to saved PC in sigcontext, from <sys/signal.h>.  */
#define SIGCONTEXT_PC_OFFSET 12

#define FRAME_SAVED_PC(FRAME) \
  (((FRAME)->signal_handler_caller \
    ? sigtramp_saved_pc (FRAME) \
    : read_memory_integer ((FRAME)->frame + 16, 4)) \
   )

/* Cannot find the AP register value directly from the FP value.  Must
   find it saved in the frame called by this one, or in the AP
   register for the innermost frame.  However, there is no way to tell
   the difference between the innermost frame and a frame for which we
   just don't know the frame that it called (e.g. "info frame
   0x7ffec789").  For the sake of argument suppose that the stack is
   somewhat trashed (which is one reason that "info frame" exists).
   So return 0 (indicating we don't know the address of
   the arglist) if we don't know what frame this frame calls.  */
#define FRAME_ARGS_ADDRESS_CORRECT(fi) \
 (((fi)->next                                  \
   ? read_memory_integer ((fi)->next->frame + 8, 4)   \
   : /* read_register (AP_REGNUM) */ 0))

/* In most of GDB, getting the args address is too important to
   just say "I don't know".  This is sometimes wrong for functions
   that aren't on top of the stack, but c'est la vie.  */
#define FRAME_ARGS_ADDRESS(fi) \
 (((fi)->next                                  \
   ? read_memory_integer ((fi)->next->frame + 8, 4)   \
   : read_register (AP_REGNUM) /* 0 */))

#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 vax_frame_num_args (struct frame_info *fi);
#define FRAME_NUM_ARGS(fi) (vax_frame_num_args ((fi)))

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

#define FRAME_ARGS_SKIP 4

/* 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 regnum;     \
  register int regmask = read_memory_integer ((frame_info)->frame+4, 4) >> 16; \
  register CORE_ADDR next_addr;     \
  memset (&frame_saved_regs, '\0', sizeof frame_saved_regs);     \
  next_addr = (frame_info)->frame + 16;     \
  /* Regmask's low bit is for register 0,     \
     which is the first one that would be pushed.  */     \
  for (regnum = 0; regnum < 12; regnum++, regmask >>= 1)  \
    (frame_saved_regs).regs[regnum] = (regmask & 1) ? (next_addr += 4) : 0;  \
  (frame_saved_regs).regs[SP_REGNUM] = next_addr + 4;  \
  if (read_memory_integer ((frame_info)->frame + 4, 4) & 0x20000000)   \
    (frame_saved_regs).regs[SP_REGNUM] += 4 + 4 * read_memory_integer (next_addr + 4, 4);  \
  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 16;  \
  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 12;  \
  (frame_saved_regs).regs[AP_REGNUM] = (frame_info)->frame + 8;  \
  (frame_saved_regs).regs[PS_REGNUM] = (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, 0); /* arglist */		    \
  for (regnum = 11; regnum >= 0; regnum--)	    \
    sp = push_word (sp, read_register (regnum));    \
  sp = push_word (sp, read_register (PC_REGNUM));   \
  sp = push_word (sp, read_register (FP_REGNUM));   \
  sp = push_word (sp, read_register (AP_REGNUM));   \
  sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef)   \
		      + 0x2fff0000);		    \
  sp = push_word (sp, 0); 			    \
  write_register (SP_REGNUM, sp);		    \
  write_register (FP_REGNUM, sp);		    \
  write_register (AP_REGNUM, sp + 17 * sizeof (int)); }

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

#define POP_FRAME  \
{ register CORE_ADDR fp = read_register (FP_REGNUM);		 \
  register int regnum;						 \
  register int regmask = read_memory_integer (fp + 4, 4);	 \
  write_register (PS_REGNUM, 					 \
		  (regmask & 0xffff)				 \
		  | (read_register (PS_REGNUM) & 0xffff0000));	 \
  write_register (PC_REGNUM, read_memory_integer (fp + 16, 4));  \
  write_register (FP_REGNUM, read_memory_integer (fp + 12, 4));  \
  write_register (AP_REGNUM, read_memory_integer (fp + 8, 4));   \
  fp += 16;							 \
  for (regnum = 0; regnum < 12; regnum++)			 \
    if (regmask & (0x10000 << regnum))				 \
      write_register (regnum, read_memory_integer (fp += 4, 4)); \
  fp = fp + 4 + ((regmask >> 30) & 3);				 \
  if (regmask & 0x20000000)					 \
    { regnum = read_memory_integer (fp, 4);			 \
      fp += (regnum + 1) * 4; }					 \
  write_register (SP_REGNUM, fp);				 \
  flush_cached_frames ();					 \
}

/* This sequence of words is the instructions
   calls #69, @#32323232
   bpt
   Note this is 8 bytes.  */

#define CALL_DUMMY {0x329f69fb, 0x03323232}

#define CALL_DUMMY_START_OFFSET 0	/* Start execution at beginning of dummy */

#define CALL_DUMMY_BREAKPOINT_OFFSET 7

/* 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)   \
{ *((char *) dummyname + 1) = nargs;		\
  *(int *)((char *) dummyname + 3) = fun; }

/* If vax pcc says CHAR or SHORT, it provides the correct address.  */

#define BELIEVE_PCC_PROMOTION 1
Commit	Line	Data
c906108c	1	/* Definitions to make GDB run on a vax under 4.2bsd.
b6ba6518 KB	2	Copyright 1986, 1987, 1989, 1991, 1993, 1994, 1996, 1998, 1999, 2000
b6ba6518 KB	3	Free Software Foundation, Inc.
c906108c	4
c5aa993b	5	This file is part of GDB.
c906108c	6
c5aa993b JM	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
c906108c	11
c5aa993b JM	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
c906108c	16
c5aa993b JM	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
c906108c SS	21
	22
	23	#define TARGET_BYTE_ORDER LITTLE_ENDIAN
	24
	25	/* Offset from address of function to start of its code.
	26	Zero on most machines. */
	27
	28	#define FUNCTION_START_OFFSET 2
	29
	30	/* Advance PC across any function entry prologue instructions
	31	to reach some "real" code. */
	32
a14ed312	33	extern CORE_ADDR vax_skip_prologue (CORE_ADDR);
b83266a0	34	#define SKIP_PROLOGUE(pc) (vax_skip_prologue (pc))
c906108c SS	35
	36	/* Immediately after a function call, return the saved pc.
	37	Can't always go through the frames for this because on some machines
	38	the new frame is not set up until the new function executes
	39	some instructions. */
	40
	41	#define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
	42
	43	#define TARGET_UPAGES 14
	44	#define TARGET_NBPG 512
	45	#define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))
	46
	47	/* On the VAX, sigtramp is in the u area. Can't check the exact
	48	addresses because for cross-debugging we don't have VAX include
	49	files around. This should be close enough. */
	50	#define SIGTRAMP_START(pc) STACK_END_ADDR
	51	#define SIGTRAMP_END(pc) 0x80000000
	52
	53	/* Stack grows downward. */
	54
	55	#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
	56
	57	/* Sequence of bytes for breakpoint instruction. */
	58
	59	#define BREAKPOINT {3}
	60
	61	/* Amount PC must be decremented by after a breakpoint.
	62	This is often the number of bytes in BREAKPOINT
	63	but not always. */
	64
	65	#define DECR_PC_AFTER_BREAK 0
	66
	67	/* Return 1 if P points to an invalid floating point value.
	68	LEN is the length in bytes -- not relevant on the Vax. */
	69
	70	#define INVALID_FLOAT(p, len) (((short ) p & 0xff80) == 0x8000)
	71
	72	/* Say how long (ordinary) registers are. This is a piece of bogosity
	73	used in push_word and a few other places; REGISTER_RAW_SIZE is the
	74	real way to know how big a register is. */
	75
	76	#define REGISTER_SIZE 4
	77
	78	/* Number of machine registers */
	79
	80	#define NUM_REGS 17
	81
	82	/* Initializer for an array of names of registers.
	83	There should be NUM_REGS strings in this initializer. */
	84
	85	#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", "ps"}
	86
	87	/* Register numbers of various important registers.
	88	Note that some of these values are "real" register numbers,
	89	and correspond to the general registers of the machine,
	90	and some are "phony" register numbers which are too large
	91	to be actual register numbers as far as the user is concerned
	92	but do serve to get the desired values when passed to read_register. */
	93
	94	#define AP_REGNUM 12
	95	#define FP_REGNUM 13 /* Contains address of executing stack frame */
	96	#define SP_REGNUM 14 /* Contains address of top of stack */
	97	#define PC_REGNUM 15 /* Contains program counter */
	98	#define PS_REGNUM 16 /* Contains processor status */
99
100	/* Total amount of space needed to store our copies of the machine's
101	register state, the array `registers'. */
102	#define REGISTER_BYTES (17*4)
103
104	/* Index within `registers' of the first byte of the space for
105	register N. */
106
107	#define REGISTER_BYTE(N) ((N) * 4)
108
109	/* Number of bytes of storage in the actual machine representation
110	for register N. On the vax, all regs are 4 bytes. */
111
112	#define REGISTER_RAW_SIZE(N) 4
113
114	/* Number of bytes of storage in the program's representation
115	for register N. On the vax, all regs are 4 bytes. */
116
117	#define REGISTER_VIRTUAL_SIZE(N) 4
118
119	/* Largest value REGISTER_RAW_SIZE can have. */
120
121	#define MAX_REGISTER_RAW_SIZE 4
122
123	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
124
125	#define MAX_REGISTER_VIRTUAL_SIZE 4
126
127	/* Return the GDB type object for the "standard" data type
128	of data in register N. */
129
130	#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
131
132	/* Store the address of the place in which to copy the structure the
133	subroutine will return. This is called from call_function. */
134
135	#define STORE_STRUCT_RETURN(ADDR, SP) \
136	{ write_register (1, (ADDR)); }
137
138	/* Extract from an array REGBUF containing the (raw) register state
139	a function return value of type TYPE, and copy that, in virtual format,
140	into VALBUF. */
141
142	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
143	memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
144
145	/* Write into appropriate registers a function return value
146	of type TYPE, given in virtual format. */
147
148	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
149	write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
150
151	/* Extract from an array REGBUF containing the (raw) register state
152	the address in which a function should return its structure value,
153	as a CORE_ADDR (or an expression that can be used as one). */
154
155	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((int )(REGBUF))
c906108c	156	\f
c5aa993b	157
c906108c SS	158	/* Describe the pointer in each stack frame to the previous stack frame
	159	(its caller). */
	160
	161	/* FRAME_CHAIN takes a frame's nominal address
	162	and produces the frame's chain-pointer. */
	163
	164	/* In the case of the Vax, the frame's nominal address is the FP value,
	165	and 12 bytes later comes the saved previous FP value as a 4-byte word. */
	166
	167	#define FRAME_CHAIN(thisframe) \
	168	(!inside_entry_file ((thisframe)->pc) ? \
	169	read_memory_integer ((thisframe)->frame + 12, 4) :\
	170	0)
	171
	172	/* Define other aspects of the stack frame. */
	173
	174	/* A macro that tells us whether the function invocation represented
	175	by FI does not have a frame on the stack associated with it. If it
	176	does not, FRAMELESS is set to 1, else 0. */
	177	/* On the vax, all functions have frames. */
392a587b	178	#define FRAMELESS_FUNCTION_INVOCATION(FI) (0)
c906108c SS	179
	180	/* Saved Pc. Get it from sigcontext if within sigtramp. */
	181
	182	/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
	183	#define SIGCONTEXT_PC_OFFSET 12
	184
	185	#define FRAME_SAVED_PC(FRAME) \
	186	(((FRAME)->signal_handler_caller \
	187	? sigtramp_saved_pc (FRAME) \
	188	: read_memory_integer ((FRAME)->frame + 16, 4)) \
	189	)
	190
	191	/* Cannot find the AP register value directly from the FP value. Must
	192	find it saved in the frame called by this one, or in the AP
	193	register for the innermost frame. However, there is no way to tell
	194	the difference between the innermost frame and a frame for which we
	195	just don't know the frame that it called (e.g. "info frame
	196	0x7ffec789"). For the sake of argument suppose that the stack is
	197	somewhat trashed (which is one reason that "info frame" exists).
	198	So return 0 (indicating we don't know the address of
	199	the arglist) if we don't know what frame this frame calls. */
	200	#define FRAME_ARGS_ADDRESS_CORRECT(fi) \
	201	(((fi)->next \
	202	? read_memory_integer ((fi)->next->frame + 8, 4) \
	203	: /* read_register (AP_REGNUM) */ 0))
	204
	205	/* In most of GDB, getting the args address is too important to
	206	just say "I don't know". This is sometimes wrong for functions
	207	that aren't on top of the stack, but c'est la vie. */
	208	#define FRAME_ARGS_ADDRESS(fi) \
	209	(((fi)->next \
	210	? read_memory_integer ((fi)->next->frame + 8, 4) \
	211	: read_register (AP_REGNUM) /* 0 */))
	212
	213	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
	214
	215	/* Return number of args passed to a frame.
	216	Can return -1, meaning no way to tell. */
	217
a14ed312	218	extern int vax_frame_num_args (struct frame_info *fi);
392a587b	219	#define FRAME_NUM_ARGS(fi) (vax_frame_num_args ((fi)))
c906108c SS	220
	221	/* Return number of bytes at start of arglist that are not really args. */
	222
	223	#define FRAME_ARGS_SKIP 4
	224
	225	/* Put here the code to store, into a struct frame_saved_regs,
	226	the addresses of the saved registers of frame described by FRAME_INFO.
	227	This includes special registers such as pc and fp saved in special
	228	ways in the stack frame. sp is even more special:
	229	the address we return for it IS the sp for the next frame. */
	230
	231	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
	232	{ register int regnum; \
	233	register int regmask = read_memory_integer ((frame_info)->frame+4, 4) >> 16; \
	234	register CORE_ADDR next_addr; \
	235	memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
	236	next_addr = (frame_info)->frame + 16; \
	237	/* Regmask's low bit is for register 0, \
	238	which is the first one that would be pushed. */ \
	239	for (regnum = 0; regnum < 12; regnum++, regmask >>= 1) \
	240	(frame_saved_regs).regs[regnum] = (regmask & 1) ? (next_addr += 4) : 0; \
	241	(frame_saved_regs).regs[SP_REGNUM] = next_addr + 4; \
	242	if (read_memory_integer ((frame_info)->frame + 4, 4) & 0x20000000) \
	243	(frame_saved_regs).regs[SP_REGNUM] += 4 + 4 * read_memory_integer (next_addr + 4, 4); \
	244	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 16; \
	245	(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 12; \
	246	(frame_saved_regs).regs[AP_REGNUM] = (frame_info)->frame + 8; \
	247	(frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \
	248	}
	249	\f
	250	/* Things needed for making the inferior call functions. */
	251
	252	/* Push an empty stack frame, to record the current PC, etc. */
	253
	254	#define PUSH_DUMMY_FRAME \
	255	{ register CORE_ADDR sp = read_register (SP_REGNUM);\
	256	register int regnum; \
	257	sp = push_word (sp, 0); /* arglist */ \
	258	for (regnum = 11; regnum >= 0; regnum--) \
	259	sp = push_word (sp, read_register (regnum)); \
	260	sp = push_word (sp, read_register (PC_REGNUM)); \
	261	sp = push_word (sp, read_register (FP_REGNUM)); \
	262	sp = push_word (sp, read_register (AP_REGNUM)); \
	263	sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) \
	264	+ 0x2fff0000); \
	265	sp = push_word (sp, 0); \
	266	write_register (SP_REGNUM, sp); \
	267	write_register (FP_REGNUM, sp); \
	268	write_register (AP_REGNUM, sp + 17 * sizeof (int)); }
	269
	270	/* Discard from the stack the innermost frame, restoring all registers. */
	271
	272	#define POP_FRAME \
	273	{ register CORE_ADDR fp = read_register (FP_REGNUM); \
	274	register int regnum; \
	275	register int regmask = read_memory_integer (fp + 4, 4); \
	276	write_register (PS_REGNUM, \
	277	(regmask & 0xffff) \
	278	\| (read_register (PS_REGNUM) & 0xffff0000)); \
	279	write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); \
	280	write_register (FP_REGNUM, read_memory_integer (fp + 12, 4)); \
	281	write_register (AP_REGNUM, read_memory_integer (fp + 8, 4)); \
	282	fp += 16; \
	283	for (regnum = 0; regnum < 12; regnum++) \
284	if (regmask & (0x10000 << regnum)) \
285	write_register (regnum, read_memory_integer (fp += 4, 4)); \
286	fp = fp + 4 + ((regmask >> 30) & 3); \
287	if (regmask & 0x20000000) \
288	{ regnum = read_memory_integer (fp, 4); \
289	fp += (regnum + 1) * 4; } \
290	write_register (SP_REGNUM, fp); \
291	flush_cached_frames (); \
292	}
293
294	/* This sequence of words is the instructions
c5aa993b JM	295	calls #69, @#32323232
c5aa993b JM	296	bpt
c906108c SS	297	Note this is 8 bytes. */
	298
	299	#define CALL_DUMMY {0x329f69fb, 0x03323232}
	300
c5aa993b	301	#define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
c906108c SS	302
	303	#define CALL_DUMMY_BREAKPOINT_OFFSET 7
	304
	305	/* Insert the specified number of args and function address
	306	into a call sequence of the above form stored at DUMMYNAME. */
	307
	308	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
	309	{ ((char ) dummyname + 1) = nargs; \
	310	(int )((char *) dummyname + 3) = fun; }
	311
	312	/* If vax pcc says CHAR or SHORT, it provides the correct address. */
	313
	314	#define BELIEVE_PCC_PROMOTION 1