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

/* Definitions to make GDB target for a tahoe running 4.3-Reno.
   Copyright 1986, 1987, 1989, 1991, 1992, 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.  */

/*
 * Ported by the State University of New York at Buffalo by the Distributed
 * Computer Systems Lab, Department of Computer Science, 1991.
 */

#define TARGET_BYTE_ORDER BIG_ENDIAN
#define BITS_BIG_ENDIAN 0

/* 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 tahoe_skip_prologue PARAMS ((CORE_ADDR));
#define SKIP_PROLOGUE(pc) (tahoe_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)

/* Wrong for cross-debugging.  I don't know the real values.  */
#include <machine/param.h>
#define TARGET_UPAGES UPAGES
#define TARGET_NBPG NBPG

/* Address of end of stack space.  */

#define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))

/* On BSD, sigtramp is in the u area.  Can't check the exact
   addresses because for cross-debugging we don't have target include
   files around.  This should be close enough.  */
#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))

/* Stack grows downward.  */

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

/* Sequence of bytes for breakpoint instruction.  */

#define BREAKPOINT {0x30}

/* 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 Tahoe. */

#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 19

/* 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", "r12", "fp", "sp", "pc", "ps", "al", "ah"}

#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 */

#define AL_REGNUM 17		/* Contains accumulator */
#define AH_REGNUM 18

/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.  */

#define REGISTER_BYTES (19*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 tahoe, 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 tahoe, 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))

/* 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 Tahoe, the frame's nominal address is the FP value,
   and it points to the old FP */

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

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

/* Saved PC */

#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))

/* In most of GDB, getting the args address is too important to
   just say "I don't know". */

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

/* Address to use as an anchor for finding local variables */

#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 tahoe_frame_num_args PARAMS ((struct frame_info * fi));
#define FRAME_NUM_ARGS(fi) (tahoe_frame_num_args ((fi)))

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

#define FRAME_ARGS_SKIP 0

/* 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 rmask = 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 - 8;     \
  for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1)  \
    (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
  (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;  \
  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8;  \
  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;      \
}

/* 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;					\
printf("PUSH_DUMMY_FRAME\n");				\
  sp = push_word (sp, read_register (FP_REGNUM));	\
  write_register (FP_REGNUM, sp);			\
  sp = push_word (sp, 0x1fff0004);   /*SAVE MASK*/	\
  sp = push_word (sp, read_register (PC_REGNUM));	\
  for (regnum = 12; regnum >= 0; 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 CORE_ADDR fp = read_register (FP_REGNUM);			\
  register int regnum;							\
  register int regmask = read_memory_integer (fp-4, 4);			\
printf("POP_FRAME\n");							\
  regmask >>= 16;                                               	\
  write_register (SP_REGNUM, fp+4);	                           	\
  write_register (PC_REGNUM, read_memory_integer(fp-8, 4));	  	\
  write_register (FP_REGNUM, read_memory_integer(fp, 4));  		\
  fp -= 8;								\
  for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1)		\
    if (regmask & 0x1000)                                            	\
      write_register (regnum, read_memory_integer (fp-=4, 4));		\
  flush_cached_frames ();						\
}

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

#define CALL_DUMMY {0xbf699f32, 0x32323230}

/* Start execution at beginning of dummy */

#define CALL_DUMMY_START_OFFSET 0

/* 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, valtype, using_gcc) \
{ int temp = (int) fun;				\
  *((char *) dummyname + 1) = nargs;		\
  memcpy((char *)dummyname+3,&temp,4); }
Commit	Line	Data
c906108c SS	1	/* Definitions to make GDB target for a tahoe running 4.3-Reno.
	2	Copyright 1986, 1987, 1989, 1991, 1992, 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	* Ported by the State University of New York at Buffalo by the Distributed
	23	* Computer Systems Lab, Department of Computer Science, 1991.
	24	*/
	25
	26	#define TARGET_BYTE_ORDER BIG_ENDIAN
	27	#define BITS_BIG_ENDIAN 0
	28
	29	/* Offset from address of function to start of its code.
	30	Zero on most machines. */
	31
	32	#define FUNCTION_START_OFFSET 2
	33
	34	/* Advance PC across any function entry prologue instructions
	35	to reach some "real" code. */
	36
b83266a0 SS	37	extern CORE_ADDR tahoe_skip_prologue PARAMS ((CORE_ADDR));
b83266a0 SS	38	#define SKIP_PROLOGUE(pc) (tahoe_skip_prologue (pc))
c906108c SS	39
	40	/* Immediately after a function call, return the saved pc.
	41	Can't always go through the frames for this because on some machines
	42	the new frame is not set up until the new function executes
	43	some instructions. */
	44
	45	#define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
	46
	47	/* Wrong for cross-debugging. I don't know the real values. */
	48	#include <machine/param.h>
	49	#define TARGET_UPAGES UPAGES
	50	#define TARGET_NBPG NBPG
	51
	52	/* Address of end of stack space. */
	53
	54	#define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
	55
	56	/* On BSD, sigtramp is in the u area. Can't check the exact
	57	addresses because for cross-debugging we don't have target include
	58	files around. This should be close enough. */
	59	#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
	60
	61	/* Stack grows downward. */
	62
	63	#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
	64
	65	/* Sequence of bytes for breakpoint instruction. */
	66
	67	#define BREAKPOINT {0x30}
	68
	69	/* Amount PC must be decremented by after a breakpoint.
	70	This is often the number of bytes in BREAKPOINT
	71	but not always. */
	72
	73	#define DECR_PC_AFTER_BREAK 0
	74
	75	/* Return 1 if P points to an invalid floating point value.
	76	LEN is the length in bytes -- not relevant on the Tahoe. */
	77
	78	#define INVALID_FLOAT(p, len) (((short ) p & 0xff80) == 0x8000)
	79
	80	/* Say how long (ordinary) registers are. This is a piece of bogosity
	81	used in push_word and a few other places; REGISTER_RAW_SIZE is the
	82	real way to know how big a register is. */
	83
	84	#define REGISTER_SIZE 4
	85
	86	/* Number of machine registers */
	87
	88	#define NUM_REGS 19
	89
	90	/* Initializer for an array of names of registers.
	91	There should be NUM_REGS strings in this initializer. */
	92
	93	#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
	94
	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	#define AL_REGNUM 17 /* Contains accumulator */
	101	#define AH_REGNUM 18
	102
103	/* Total amount of space needed to store our copies of the machine's
104	register state, the array `registers'. */
105
106	#define REGISTER_BYTES (19*4)
107
108	/* Index within `registers' of the first byte of the space for
109	register N. */
110
111	#define REGISTER_BYTE(N) ((N) * 4)
112
113	/* Number of bytes of storage in the actual machine representation
114	for register N. On the tahoe, all regs are 4 bytes. */
115
116	#define REGISTER_RAW_SIZE(N) 4
117
118	/* Number of bytes of storage in the program's representation
119	for register N. On the tahoe, all regs are 4 bytes. */
120
121	#define REGISTER_VIRTUAL_SIZE(N) 4
122
123	/* Largest value REGISTER_RAW_SIZE can have. */
124
125	#define MAX_REGISTER_RAW_SIZE 4
126
127	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
128
129	#define MAX_REGISTER_VIRTUAL_SIZE 4
130
131	/* Return the GDB type object for the "standard" data type
132	of data in register N. */
133
134	#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
135
136	/* Store the address of the place in which to copy the structure the
137	subroutine will return. This is called from call_function. */
138
139	#define STORE_STRUCT_RETURN(ADDR, SP) \
140	{ write_register (1, (ADDR)); }
141
142	/* Extract from an array REGBUF containing the (raw) register state
143	a function return value of type TYPE, and copy that, in virtual format,
144	into VALBUF. */
145
146	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
147	memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
148
149	/* Write into appropriate registers a function return value
150	of type TYPE, given in virtual format. */
151
152	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
153	write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
154
155	/* Extract from an array REGBUF containing the (raw) register state
156	the address in which a function should return its structure value,
157	as a CORE_ADDR (or an expression that can be used as one). */
158
159	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((int )(REGBUF))
160
161	/* Describe the pointer in each stack frame to the previous stack frame
162	(its caller).
163
164	FRAME_CHAIN takes a frame's nominal address
165	and produces the frame's chain-pointer. */
166
167	/* In the case of the Tahoe, the frame's nominal address is the FP value,
168	and it points to the old FP */
169
170	#define FRAME_CHAIN(thisframe) \
171	(!inside_entry_file ((thisframe)->pc) ? \
172	read_memory_integer ((thisframe)->frame, 4) :\
173	0)
174
175	/* Define other aspects of the stack frame. */
176
177	/* Saved PC */
178
179	#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
180
181	/* In most of GDB, getting the args address is too important to
182	just say "I don't know". */
183
184	#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
185
186	/* Address to use as an anchor for finding local variables */
187
188	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
189
190	/* Return number of args passed to a frame.
191	Can return -1, meaning no way to tell. */
192
c5aa993b	193	extern int tahoe_frame_num_args PARAMS ((struct frame_info * fi));
392a587b	194	#define FRAME_NUM_ARGS(fi) (tahoe_frame_num_args ((fi)))
c906108c SS	195
	196	/* Return number of bytes at start of arglist that are not really args. */
	197
	198	#define FRAME_ARGS_SKIP 0
	199
	200	/* Put here the code to store, into a struct frame_saved_regs,
	201	the addresses of the saved registers of frame described by FRAME_INFO.
	202	This includes special registers such as pc and fp saved in special
	203	ways in the stack frame. sp is even more special:
	204	the address we return for it IS the sp for the next frame. */
	205
	206	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
	207	{ register int regnum; \
	208	register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
	209	register CORE_ADDR next_addr; \
	210	memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
	211	next_addr = (frame_info)->frame - 8; \
	212	for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1) \
	213	(frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
	214	(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
	215	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8; \
	216	(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
	217	}
	218
	219	/* Things needed for making the inferior call functions. */
	220
	221	/* Push an empty stack frame, to record the current PC, etc. */
	222
	223	#define PUSH_DUMMY_FRAME \
	224	{ register CORE_ADDR sp = read_register (SP_REGNUM); \
	225	register int regnum; \
	226	printf("PUSH_DUMMY_FRAME\n"); \
	227	sp = push_word (sp, read_register (FP_REGNUM)); \
	228	write_register (FP_REGNUM, sp); \
	229	sp = push_word (sp, 0x1fff0004); /SAVE MASK/ \
	230	sp = push_word (sp, read_register (PC_REGNUM)); \
	231	for (regnum = 12; regnum >= 0; regnum--) \
	232	sp = push_word (sp, read_register (regnum)); \
	233	write_register (SP_REGNUM, sp); \
	234	}
	235
	236	/* Discard from the stack the innermost frame, restoring all registers. */
	237
	238	#define POP_FRAME \
	239	{ register CORE_ADDR fp = read_register (FP_REGNUM); \
	240	register int regnum; \
	241	register int regmask = read_memory_integer (fp-4, 4); \
	242	printf("POP_FRAME\n"); \
	243	regmask >>= 16; \
	244	write_register (SP_REGNUM, fp+4); \
	245	write_register (PC_REGNUM, read_memory_integer(fp-8, 4)); \
	246	write_register (FP_REGNUM, read_memory_integer(fp, 4)); \
	247	fp -= 8; \
	248	for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1) \
	249	if (regmask & 0x1000) \
	250	write_register (regnum, read_memory_integer (fp-=4, 4)); \
	251	flush_cached_frames (); \
	252	}
	253
	254	/* This sequence of words is the instructions
c5aa993b JM	255	calls #69, @#32323232
c5aa993b JM	256	bpt
c906108c SS	257	Note this is 8 bytes. */
	258
	259	#define CALL_DUMMY {0xbf699f32, 0x32323230}
	260
	261	/* Start execution at beginning of dummy */
	262
	263	#define CALL_DUMMY_START_OFFSET 0
	264
	265	/* Insert the specified number of args and function address
	266	into a call sequence of the above form stored at DUMMYNAME. */
	267
	268	#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \
	269	{ int temp = (int) fun; \
	270	((char ) dummyname + 1) = nargs; \
	271	memcpy((char *)dummyname+3,&temp,4); }