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