[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.  */

#include "regcache.h"

#define TARGET_BYTE_ORDER BFD_ENDIAN_LITTLE

/* 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	21
f88e2c52	22	#include "regcache.h"
c906108c	23
778eb05e	24	#define TARGET_BYTE_ORDER BFD_ENDIAN_LITTLE
c906108c SS	25
	26	/* Offset from address of function to start of its code.
	27	Zero on most machines. */
	28
	29	#define FUNCTION_START_OFFSET 2
	30
	31	/* Advance PC across any function entry prologue instructions
	32	to reach some "real" code. */
	33
a14ed312	34	extern CORE_ADDR vax_skip_prologue (CORE_ADDR);
b83266a0	35	#define SKIP_PROLOGUE(pc) (vax_skip_prologue (pc))
c906108c SS	36
	37	/* Immediately after a function call, return the saved pc.
	38	Can't always go through the frames for this because on some machines
	39	the new frame is not set up until the new function executes
	40	some instructions. */
	41
	42	#define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
	43
	44	#define TARGET_UPAGES 14
	45	#define TARGET_NBPG 512
	46	#define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))
	47
	48	/* On the VAX, sigtramp is in the u area. Can't check the exact
	49	addresses because for cross-debugging we don't have VAX include
	50	files around. This should be close enough. */
	51	#define SIGTRAMP_START(pc) STACK_END_ADDR
	52	#define SIGTRAMP_END(pc) 0x80000000
	53
	54	/* Stack grows downward. */
	55
	56	#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
	57
	58	/* Sequence of bytes for breakpoint instruction. */
	59
	60	#define BREAKPOINT {3}
	61
	62	/* Amount PC must be decremented by after a breakpoint.
	63	This is often the number of bytes in BREAKPOINT
	64	but not always. */
	65
	66	#define DECR_PC_AFTER_BREAK 0
	67
	68	/* Return 1 if P points to an invalid floating point value.
	69	LEN is the length in bytes -- not relevant on the Vax. */
	70
	71	#define INVALID_FLOAT(p, len) (((short ) p & 0xff80) == 0x8000)
	72
	73	/* Say how long (ordinary) registers are. This is a piece of bogosity
	74	used in push_word and a few other places; REGISTER_RAW_SIZE is the
	75	real way to know how big a register is. */
	76
	77	#define REGISTER_SIZE 4
	78
	79	/* Number of machine registers */
	80
	81	#define NUM_REGS 17
	82
	83	/* Initializer for an array of names of registers.
	84	There should be NUM_REGS strings in this initializer. */
	85
	86	#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", "ps"}
	87
	88	/* Register numbers of various important registers.
	89	Note that some of these values are "real" register numbers,
	90	and correspond to the general registers of the machine,
	91	and some are "phony" register numbers which are too large
	92	to be actual register numbers as far as the user is concerned
	93	but do serve to get the desired values when passed to read_register. */
	94
	95	#define AP_REGNUM 12
	96	#define FP_REGNUM 13 /* Contains address of executing stack frame */
	97	#define SP_REGNUM 14 /* Contains address of top of stack */
	98	#define PC_REGNUM 15 /* Contains program counter */
	99	#define PS_REGNUM 16 /* Contains processor status */
100
101	/* Total amount of space needed to store our copies of the machine's
102	register state, the array `registers'. */
103	#define REGISTER_BYTES (17*4)
104
105	/* Index within `registers' of the first byte of the space for
106	register N. */
107
108	#define REGISTER_BYTE(N) ((N) * 4)
109
110	/* Number of bytes of storage in the actual machine representation
111	for register N. On the vax, all regs are 4 bytes. */
112
113	#define REGISTER_RAW_SIZE(N) 4
114
115	/* Number of bytes of storage in the program's representation
116	for register N. On the vax, all regs are 4 bytes. */
117
118	#define REGISTER_VIRTUAL_SIZE(N) 4
119
120	/* Largest value REGISTER_RAW_SIZE can have. */
121
122	#define MAX_REGISTER_RAW_SIZE 4
123
124	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
125
126	#define MAX_REGISTER_VIRTUAL_SIZE 4
127
128	/* Return the GDB type object for the "standard" data type
129	of data in register N. */
130
131	#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
132
133	/* Store the address of the place in which to copy the structure the
134	subroutine will return. This is called from call_function. */
135
136	#define STORE_STRUCT_RETURN(ADDR, SP) \
137	{ write_register (1, (ADDR)); }
138
139	/* Extract from an array REGBUF containing the (raw) register state
140	a function return value of type TYPE, and copy that, in virtual format,
141	into VALBUF. */
142
143	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
144	memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
145
146	/* Write into appropriate registers a function return value
147	of type TYPE, given in virtual format. */
148
149	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
150	write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
151
152	/* Extract from an array REGBUF containing the (raw) register state
153	the address in which a function should return its structure value,
154	as a CORE_ADDR (or an expression that can be used as one). */
155
156	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((int )(REGBUF))
c906108c	157	\f
c5aa993b	158
c906108c SS	159	/* Describe the pointer in each stack frame to the previous stack frame
	160	(its caller). */
	161
	162	/* FRAME_CHAIN takes a frame's nominal address
	163	and produces the frame's chain-pointer. */
	164
	165	/* In the case of the Vax, the frame's nominal address is the FP value,
	166	and 12 bytes later comes the saved previous FP value as a 4-byte word. */
	167
	168	#define FRAME_CHAIN(thisframe) \
	169	(!inside_entry_file ((thisframe)->pc) ? \
	170	read_memory_integer ((thisframe)->frame + 12, 4) :\
	171	0)
	172
	173	/* Define other aspects of the stack frame. */
	174
	175	/* A macro that tells us whether the function invocation represented
	176	by FI does not have a frame on the stack associated with it. If it
	177	does not, FRAMELESS is set to 1, else 0. */
	178	/* On the vax, all functions have frames. */
392a587b	179	#define FRAMELESS_FUNCTION_INVOCATION(FI) (0)
c906108c SS	180
	181	/* Saved Pc. Get it from sigcontext if within sigtramp. */
	182
	183	/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
	184	#define SIGCONTEXT_PC_OFFSET 12
	185
	186	#define FRAME_SAVED_PC(FRAME) \
	187	(((FRAME)->signal_handler_caller \
	188	? sigtramp_saved_pc (FRAME) \
	189	: read_memory_integer ((FRAME)->frame + 16, 4)) \
	190	)
	191
	192	/* Cannot find the AP register value directly from the FP value. Must
	193	find it saved in the frame called by this one, or in the AP
	194	register for the innermost frame. However, there is no way to tell
	195	the difference between the innermost frame and a frame for which we
	196	just don't know the frame that it called (e.g. "info frame
	197	0x7ffec789"). For the sake of argument suppose that the stack is
	198	somewhat trashed (which is one reason that "info frame" exists).
	199	So return 0 (indicating we don't know the address of
	200	the arglist) if we don't know what frame this frame calls. */
	201	#define FRAME_ARGS_ADDRESS_CORRECT(fi) \
	202	(((fi)->next \
	203	? read_memory_integer ((fi)->next->frame + 8, 4) \
	204	: /* read_register (AP_REGNUM) */ 0))
	205
	206	/* In most of GDB, getting the args address is too important to
	207	just say "I don't know". This is sometimes wrong for functions
	208	that aren't on top of the stack, but c'est la vie. */
	209	#define FRAME_ARGS_ADDRESS(fi) \
	210	(((fi)->next \
	211	? read_memory_integer ((fi)->next->frame + 8, 4) \
	212	: read_register (AP_REGNUM) /* 0 */))
	213
	214	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
	215
	216	/* Return number of args passed to a frame.
	217	Can return -1, meaning no way to tell. */
	218
a14ed312	219	extern int vax_frame_num_args (struct frame_info *fi);
392a587b	220	#define FRAME_NUM_ARGS(fi) (vax_frame_num_args ((fi)))
c906108c SS	221
	222	/* Return number of bytes at start of arglist that are not really args. */
	223
	224	#define FRAME_ARGS_SKIP 4
	225
	226	/* Put here the code to store, into a struct frame_saved_regs,
	227	the addresses of the saved registers of frame described by FRAME_INFO.
	228	This includes special registers such as pc and fp saved in special
	229	ways in the stack frame. sp is even more special:
	230	the address we return for it IS the sp for the next frame. */
	231
	232	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
	233	{ register int regnum; \
	234	register int regmask = read_memory_integer ((frame_info)->frame+4, 4) >> 16; \
	235	register CORE_ADDR next_addr; \
	236	memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
	237	next_addr = (frame_info)->frame + 16; \
	238	/* Regmask's low bit is for register 0, \
	239	which is the first one that would be pushed. */ \
	240	for (regnum = 0; regnum < 12; regnum++, regmask >>= 1) \
	241	(frame_saved_regs).regs[regnum] = (regmask & 1) ? (next_addr += 4) : 0; \
	242	(frame_saved_regs).regs[SP_REGNUM] = next_addr + 4; \
	243	if (read_memory_integer ((frame_info)->frame + 4, 4) & 0x20000000) \
	244	(frame_saved_regs).regs[SP_REGNUM] += 4 + 4 * read_memory_integer (next_addr + 4, 4); \
	245	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 16; \
	246	(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 12; \
	247	(frame_saved_regs).regs[AP_REGNUM] = (frame_info)->frame + 8; \
	248	(frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \
	249	}
	250	\f
	251	/* Things needed for making the inferior call functions. */
	252
	253	/* Push an empty stack frame, to record the current PC, etc. */
	254
	255	#define PUSH_DUMMY_FRAME \
	256	{ register CORE_ADDR sp = read_register (SP_REGNUM);\
	257	register int regnum; \
	258	sp = push_word (sp, 0); /* arglist */ \
	259	for (regnum = 11; regnum >= 0; regnum--) \
	260	sp = push_word (sp, read_register (regnum)); \
	261	sp = push_word (sp, read_register (PC_REGNUM)); \
	262	sp = push_word (sp, read_register (FP_REGNUM)); \
	263	sp = push_word (sp, read_register (AP_REGNUM)); \
	264	sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) \
	265	+ 0x2fff0000); \
	266	sp = push_word (sp, 0); \
	267	write_register (SP_REGNUM, sp); \
	268	write_register (FP_REGNUM, sp); \
	269	write_register (AP_REGNUM, sp + 17 * sizeof (int)); }
	270
	271	/* Discard from the stack the innermost frame, restoring all registers. */
	272
	273	#define POP_FRAME \
	274	{ register CORE_ADDR fp = read_register (FP_REGNUM); \
	275	register int regnum; \
	276	register int regmask = read_memory_integer (fp + 4, 4); \
	277	write_register (PS_REGNUM, \
	278	(regmask & 0xffff) \
	279	\| (read_register (PS_REGNUM) & 0xffff0000)); \
	280	write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); \
	281	write_register (FP_REGNUM, read_memory_integer (fp + 12, 4)); \
	282	write_register (AP_REGNUM, read_memory_integer (fp + 8, 4)); \
	283	fp += 16; \
	284	for (regnum = 0; regnum < 12; regnum++) \
285	if (regmask & (0x10000 << regnum)) \
286	write_register (regnum, read_memory_integer (fp += 4, 4)); \
287	fp = fp + 4 + ((regmask >> 30) & 3); \
288	if (regmask & 0x20000000) \
289	{ regnum = read_memory_integer (fp, 4); \
290	fp += (regnum + 1) * 4; } \
291	write_register (SP_REGNUM, fp); \
292	flush_cached_frames (); \
293	}
294
295	/* This sequence of words is the instructions
c5aa993b JM	296	calls #69, @#32323232
c5aa993b JM	297	bpt
c906108c SS	298	Note this is 8 bytes. */
	299
	300	#define CALL_DUMMY {0x329f69fb, 0x03323232}
	301
c5aa993b	302	#define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
c906108c SS	303
	304	#define CALL_DUMMY_BREAKPOINT_OFFSET 7
	305
	306	/* Insert the specified number of args and function address
	307	into a call sequence of the above form stored at DUMMYNAME. */
	308
	309	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
	310	{ ((char ) dummyname + 1) = nargs; \
	311	(int )((char *) dummyname + 3) = fun; }
	312
	313	/* If vax pcc says CHAR or SHORT, it provides the correct address. */
	314
	315	#define BELIEVE_PCC_PROMOTION 1