From 2001-07-23 Andreas Schwab <schwab@suse.de>:
[deliverable/binutils-gdb.git] / gdb / config / m68k / tm-m68k.h
1 /* Parameters for execution on a 68000 series machine.
2 Copyright 1986, 1987, 1989, 1990, 1992, 1993, 1994, 1995, 1996, 1998,
3 1999, 2000 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
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.
11
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.
16
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. */
21
22 #include "regcache.h"
23
24 /* Generic 68000 stuff, to be included by other tm-*.h files. */
25
26 #define IEEE_FLOAT (1)
27
28 /* Define the bit, byte, and word ordering of the machine. */
29 #define TARGET_BYTE_ORDER BIG_ENDIAN
30
31 #define TARGET_LONG_DOUBLE_FORMAT &floatformat_m68881_ext
32
33 #define TARGET_LONG_DOUBLE_BIT 96
34
35 /* Offset from address of function to start of its code.
36 Zero on most machines. */
37
38 #define FUNCTION_START_OFFSET 0
39
40 /* Advance PC across any function entry prologue instructions
41 to reach some "real" code. */
42
43 #if !defined(SKIP_PROLOGUE)
44 #define SKIP_PROLOGUE(ip) (m68k_skip_prologue (ip))
45 #endif
46 extern CORE_ADDR m68k_skip_prologue (CORE_ADDR ip);
47
48 /* Immediately after a function call, return the saved pc.
49 Can't always go through the frames for this because on some machines
50 the new frame is not set up until the new function executes
51 some instructions. */
52
53 struct frame_info;
54 struct frame_saved_regs;
55
56 extern CORE_ADDR m68k_saved_pc_after_call (struct frame_info *);
57 extern void m68k_find_saved_regs (struct frame_info *,
58 struct frame_saved_regs *);
59
60 #define SAVED_PC_AFTER_CALL(frame) \
61 m68k_saved_pc_after_call(frame)
62
63 /* Stack grows downward. */
64
65 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
66
67 /* Stack must be kept short aligned when doing function calls. */
68
69 #define STACK_ALIGN(ADDR) (((ADDR) + 1) & ~1)
70
71 /* Sequence of bytes for breakpoint instruction.
72 This is a TRAP instruction. The last 4 bits (0xf below) is the
73 vector. Systems which don't use 0xf should define BPT_VECTOR
74 themselves before including this file. */
75
76 #if !defined (BPT_VECTOR)
77 #define BPT_VECTOR 0xf
78 #endif
79
80 #if !defined (BREAKPOINT)
81 #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
82 #endif
83
84 /* We default to vector 1 for the "remote" target, but allow targets
85 to override. */
86 #if !defined (REMOTE_BPT_VECTOR)
87 #define REMOTE_BPT_VECTOR 1
88 #endif
89
90 #if !defined (REMOTE_BREAKPOINT)
91 #define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)}
92 #endif
93
94 /* If your kernel resets the pc after the trap happens you may need to
95 define this before including this file. */
96
97 #if !defined (DECR_PC_AFTER_BREAK)
98 #define DECR_PC_AFTER_BREAK 2
99 #endif
100
101 /* Say how long (ordinary) registers are. This is a piece of bogosity
102 used in push_word and a few other places; REGISTER_RAW_SIZE is the
103 real way to know how big a register is. */
104
105 #define REGISTER_SIZE 4
106
107 #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
108 #define REGISTER_BYTES_NOFP (16*4 + 8)
109
110 #ifndef NUM_REGS
111 #define NUM_REGS 29
112 #endif
113
114 #define NUM_FREGS (NUM_REGS-24)
115
116 #ifndef REGISTER_BYTES_OK
117 #define REGISTER_BYTES_OK(b) \
118 ((b) == REGISTER_BYTES_FP \
119 || (b) == REGISTER_BYTES_NOFP)
120 #endif
121
122 #ifndef REGISTER_BYTES
123 #define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
124 #endif
125
126 /* Index within `registers' of the first byte of the space for
127 register N. */
128
129 #define REGISTER_BYTE(N) \
130 ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \
131 : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \
132 : (N) * 4)
133
134 /* Number of bytes of storage in the actual machine representation
135 for register N. On the 68000, all regs are 4 bytes
136 except the floating point regs which are 12 bytes. */
137 /* Note that the unsigned cast here forces the result of the
138 subtraction to very high positive values if N < FP0_REGNUM */
139
140 #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
141
142 /* Number of bytes of storage in the program's representation
143 for register N. On the 68000, all regs are 4 bytes
144 except the floating point regs which are 12-byte long doubles. */
145
146 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
147
148 /* Largest value REGISTER_RAW_SIZE can have. */
149
150 #define MAX_REGISTER_RAW_SIZE 12
151
152 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
153
154 #define MAX_REGISTER_VIRTUAL_SIZE 12
155
156 /* Return the GDB type object for the "standard" data type of data
157 in register N. This should be int for D0-D7, long double for FP0-FP7,
158 and void pointer for all others (A0-A7, PC, SR, FPCONTROL etc).
159 Note, for registers which contain addresses return pointer to void,
160 not pointer to char, because we don't want to attempt to print
161 the string after printing the address. */
162
163 #define REGISTER_VIRTUAL_TYPE(N) \
164 ((unsigned) (N) >= FPC_REGNUM ? lookup_pointer_type (builtin_type_void) : \
165 (unsigned) (N) >= FP0_REGNUM ? builtin_type_long_double : \
166 (unsigned) (N) >= A0_REGNUM ? lookup_pointer_type (builtin_type_void) : \
167 builtin_type_int)
168
169 /* Initializer for an array of names of registers.
170 Entries beyond the first NUM_REGS are ignored. */
171
172 #define REGISTER_NAMES \
173 {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
174 "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
175 "ps", "pc", \
176 "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
177 "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" }
178
179 /* Register numbers of various important registers.
180 Note that some of these values are "real" register numbers,
181 and correspond to the general registers of the machine,
182 and some are "phony" register numbers which are too large
183 to be actual register numbers as far as the user is concerned
184 but do serve to get the desired values when passed to read_register. */
185
186 #define D0_REGNUM 0
187 #define A0_REGNUM 8
188 #define A1_REGNUM 9
189 #define FP_REGNUM 14 /* Contains address of executing stack frame */
190 #define SP_REGNUM 15 /* Contains address of top of stack */
191 #define PS_REGNUM 16 /* Contains processor status */
192 #define PC_REGNUM 17 /* Contains program counter */
193 #define FP0_REGNUM 18 /* Floating point register 0 */
194 #define FPC_REGNUM 26 /* 68881 control register */
195 #define FPS_REGNUM 27 /* 68881 status register */
196 #define FPI_REGNUM 28 /* 68881 iaddr register */
197
198 /* Store the address of the place in which to copy the structure the
199 subroutine will return. This is called from call_function. */
200
201 #define STORE_STRUCT_RETURN(ADDR, SP) \
202 { write_register (A1_REGNUM, (ADDR)); }
203
204 /* Extract from an array REGBUF containing the (raw) register state
205 a function return value of type TYPE, and copy that, in virtual format,
206 into VALBUF. This is assuming that floating point values are returned
207 as doubles in d0/d1. */
208
209 #if !defined (EXTRACT_RETURN_VALUE)
210 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
211 memcpy ((VALBUF), \
212 (char *)(REGBUF) + \
213 (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \
214 TYPE_LENGTH(TYPE))
215 #endif
216
217 /* Write into appropriate registers a function return value
218 of type TYPE, given in virtual format. Assumes floats are passed
219 in d0/d1. */
220
221 #if !defined (STORE_RETURN_VALUE)
222 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
223 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
224 #endif
225
226 /* Extract from an array REGBUF containing the (raw) register state
227 the address in which a function should return its structure value,
228 as a CORE_ADDR (or an expression that can be used as one). */
229
230 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
231 \f
232 /* Describe the pointer in each stack frame to the previous stack frame
233 (its caller). */
234
235 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
236 chain-pointer.
237 In the case of the 68000, the frame's nominal address
238 is the address of a 4-byte word containing the calling frame's address. */
239
240 /* If we are chaining from sigtramp, then manufacture a sigtramp frame
241 (which isn't really on the stack. I'm not sure this is right for anything
242 but BSD4.3 on an hp300. */
243 #define FRAME_CHAIN(thisframe) \
244 (thisframe->signal_handler_caller \
245 ? thisframe->frame \
246 : (!inside_entry_file ((thisframe)->pc) \
247 ? read_memory_integer ((thisframe)->frame, 4) \
248 : 0))
249
250 /* Define other aspects of the stack frame. */
251
252 /* A macro that tells us whether the function invocation represented
253 by FI does not have a frame on the stack associated with it. If it
254 does not, FRAMELESS is set to 1, else 0. */
255 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
256 (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue(FI))
257
258 /* This was determined by experimentation on hp300 BSD 4.3. Perhaps
259 it corresponds to some offset in /usr/include/sys/user.h or
260 something like that. Using some system include file would
261 have the advantage of probably being more robust in the face
262 of OS upgrades, but the disadvantage of being wrong for
263 cross-debugging. */
264
265 #define SIG_PC_FP_OFFSET 530
266
267 #define FRAME_SAVED_PC(FRAME) \
268 (((FRAME)->signal_handler_caller \
269 ? ((FRAME)->next \
270 ? read_memory_integer ((FRAME)->next->frame + SIG_PC_FP_OFFSET, 4) \
271 : read_memory_integer (read_register (SP_REGNUM) \
272 + SIG_PC_FP_OFFSET - 8, 4) \
273 ) \
274 : read_memory_integer ((FRAME)->frame + 4, 4)) \
275 )
276
277 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
278
279 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
280
281 /* Set VAL to the number of args passed to frame described by FI.
282 Can set VAL to -1, meaning no way to tell. */
283
284 /* We can't tell how many args there are
285 now that the C compiler delays popping them. */
286 #if !defined (FRAME_NUM_ARGS)
287 #define FRAME_NUM_ARGS(fi) (-1)
288 #endif
289
290 /* Return number of bytes at start of arglist that are not really args. */
291
292 #define FRAME_ARGS_SKIP 8
293
294 /* Put here the code to store, into a struct frame_saved_regs,
295 the addresses of the saved registers of frame described by FRAME_INFO.
296 This includes special registers such as pc and fp saved in special
297 ways in the stack frame. sp is even more special:
298 the address we return for it IS the sp for the next frame. */
299
300 #if !defined (FRAME_FIND_SAVED_REGS)
301 #define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr))
302 #endif /* no FIND_FRAME_SAVED_REGS. */
303 \f
304
305 /* Things needed for making the inferior call functions. */
306
307 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
308 by gdb itself:
309
310 These instructions exist only so that m68k_find_saved_regs can parse
311 them as a "prologue"; they are never executed.
312
313 fmovemx fp0-fp7,sp@- 0xf227 0xe0ff
314 moveml d0-a5,sp@- 0x48e7 0xfffc
315 clrw sp@- 0x4267
316 movew ccr,sp@- 0x42e7
317
318 The arguments are pushed at this point by GDB; no code is needed in
319 the dummy for this. The CALL_DUMMY_START_OFFSET gives the position
320 of the following jsr instruction. That is where we start
321 executing.
322
323 jsr @#0x32323232 0x4eb9 0x3232 0x3232
324 addal #0x69696969,sp 0xdffc 0x6969 0x6969
325 trap #<your BPT_VECTOR number here> 0x4e4?
326 nop 0x4e71
327
328 Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
329
330 The dummy frame always saves the floating-point registers, whether they
331 actually exist on this target or not. */
332
333 /* FIXME: Wrong to hardwire this as BPT_VECTOR when sometimes it
334 should be REMOTE_BPT_VECTOR. Best way to fix it would be to define
335 CALL_DUMMY_BREAKPOINT_OFFSET. */
336
337 #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
338 #define CALL_DUMMY_LENGTH 28 /* Size of CALL_DUMMY */
339 #define CALL_DUMMY_START_OFFSET 12 /* Offset to jsr instruction */
340 #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12)
341
342 /* Insert the specified number of args and function address
343 into a call sequence of the above form stored at DUMMYNAME.
344 We use the BFD routines to store a big-endian value of known size. */
345
346 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
347 { bfd_putb32 (fun, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
348 bfd_putb32 (nargs*4, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
349
350 /* Push an empty stack frame, to record the current PC, etc. */
351
352 #define PUSH_DUMMY_FRAME { m68k_push_dummy_frame (); }
353
354 extern void m68k_push_dummy_frame (void);
355
356 extern void m68k_pop_frame (void);
357
358 /* Discard from the stack the innermost frame, restoring all registers. */
359
360 #define POP_FRAME { m68k_pop_frame (); }
361
362 /* Offset from SP to first arg on stack at first instruction of a function */
363
364 #define SP_ARG0 (1 * 4)
365
366 #define TARGET_M68K
367
368 /* Figure out where the longjmp will land. Slurp the args out of the stack.
369 We expect the first arg to be a pointer to the jmp_buf structure from which
370 we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
371 This routine returns true on success */
372
373 extern int m68k_get_longjmp_target (CORE_ADDR *);
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