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[/] [or1k/] [trunk/] [insight/] [gdb/] [config/] [m68k/] [tm-m68k.h] - Blame information for rev 1765

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1 578 markom
/* Parameters for execution on a 68000 series machine.
2
   Copyright 1986, 1987, 1989, 1990, 1992, 1993, 1994, 1995, 1996, 1998,
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   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
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   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
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   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
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   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.
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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,
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   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
/* Offset from address of function to start of its code.
32
   Zero on most machines.  */
33
 
34
#define FUNCTION_START_OFFSET 0
35
 
36
/* Advance PC across any function entry prologue instructions
37
   to reach some "real" code.  */
38
 
39
#if !defined(SKIP_PROLOGUE)
40
#define SKIP_PROLOGUE(ip) (m68k_skip_prologue (ip))
41
#endif
42
extern CORE_ADDR m68k_skip_prologue (CORE_ADDR ip);
43
 
44
/* Immediately after a function call, return the saved pc.
45
   Can't always go through the frames for this because on some machines
46
   the new frame is not set up until the new function executes
47
   some instructions.  */
48
 
49
struct frame_info;
50
struct frame_saved_regs;
51
 
52
extern CORE_ADDR m68k_saved_pc_after_call (struct frame_info *);
53
extern void m68k_find_saved_regs (struct frame_info *,
54
                                  struct frame_saved_regs *);
55
 
56
#define SAVED_PC_AFTER_CALL(frame) \
57
  m68k_saved_pc_after_call(frame)
58
 
59
/* Stack grows downward.  */
60
 
61
#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
62
 
63
/* Stack must be kept short aligned when doing function calls.  */
64
 
65
#define STACK_ALIGN(ADDR) (((ADDR) + 1) & ~1)
66
 
67
/* Sequence of bytes for breakpoint instruction.
68
   This is a TRAP instruction.  The last 4 bits (0xf below) is the
69
   vector.  Systems which don't use 0xf should define BPT_VECTOR
70
   themselves before including this file.  */
71
 
72
#if !defined (BPT_VECTOR)
73
#define BPT_VECTOR 0xf
74
#endif
75
 
76
#if !defined (BREAKPOINT)
77
#define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
78
#endif
79
 
80
/* We default to vector 1 for the "remote" target, but allow targets
81
   to override.  */
82
#if !defined (REMOTE_BPT_VECTOR)
83
#define REMOTE_BPT_VECTOR 1
84
#endif
85
 
86
#if !defined (REMOTE_BREAKPOINT)
87
#define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)}
88
#endif
89
 
90
/* If your kernel resets the pc after the trap happens you may need to
91
   define this before including this file.  */
92
 
93
#if !defined (DECR_PC_AFTER_BREAK)
94
#define DECR_PC_AFTER_BREAK 2
95
#endif
96
 
97
/* Say how long (ordinary) registers are.  This is a piece of bogosity
98
   used in push_word and a few other places; REGISTER_RAW_SIZE is the
99
   real way to know how big a register is.  */
100
 
101
#define REGISTER_SIZE 4
102
 
103
#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
104
#define REGISTER_BYTES_NOFP (16*4 + 8)
105
 
106
#ifndef NUM_REGS
107
#define NUM_REGS 29
108
#endif
109
 
110
#define NUM_FREGS (NUM_REGS-24)
111
 
112
#ifndef REGISTER_BYTES_OK
113
#define REGISTER_BYTES_OK(b) \
114
   ((b) == REGISTER_BYTES_FP \
115
    || (b) == REGISTER_BYTES_NOFP)
116
#endif
117
 
118
#ifndef REGISTER_BYTES
119
#define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
120
#endif
121
 
122
/* Index within `registers' of the first byte of the space for
123
   register N.  */
124
 
125
#define REGISTER_BYTE(N)  \
126
 ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168    \
127
  : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72  \
128
  : (N) * 4)
129
 
130
/* Number of bytes of storage in the actual machine representation
131
   for register N.  On the 68000, all regs are 4 bytes
132
   except the floating point regs which are 12 bytes.  */
133
/* Note that the unsigned cast here forces the result of the
134
   subtraction to very high positive values if N < FP0_REGNUM */
135
 
136
#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
137
 
138
/* Number of bytes of storage in the program's representation
139
   for register N.  On the 68000, all regs are 4 bytes
140
   except the floating point regs which are 8-byte doubles.  */
141
 
142
#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
143
 
144
/* Largest value REGISTER_RAW_SIZE can have.  */
145
 
146
#define MAX_REGISTER_RAW_SIZE 12
147
 
148
/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
149
 
150
#define MAX_REGISTER_VIRTUAL_SIZE 8
151
 
152
/* Nonzero if register N requires conversion
153
   from raw format to virtual format.  */
154
 
155
#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
156
 
157
#include "floatformat.h"
158
 
159
/* Convert data from raw format for register REGNUM in buffer FROM
160
   to virtual format with type TYPE in buffer TO.  */
161
 
162
#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
163
do                                                                      \
164
  {                                                                     \
165
    DOUBLEST dbl_tmp_val;                                                       \
166
    floatformat_to_doublest (&floatformat_m68881_ext, (FROM), &dbl_tmp_val); \
167
    store_floating ((TO), TYPE_LENGTH (TYPE), dbl_tmp_val);             \
168
  } while (0)
169
 
170
/* Convert data from virtual format with type TYPE in buffer FROM
171
   to raw format for register REGNUM in buffer TO.  */
172
 
173
#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO)    \
174
do                                                                      \
175
  {                                                                     \
176
    DOUBLEST dbl_tmp_val;                                               \
177
    dbl_tmp_val = extract_floating ((FROM), TYPE_LENGTH (TYPE));        \
178
    floatformat_from_doublest (&floatformat_m68881_ext, &dbl_tmp_val, (TO)); \
179
  } while (0)
180
 
181
/* Return the GDB type object for the "standard" data type of data
182
   in register N.  This should be int for D0-D7, double for FP0-FP7,
183
   and void pointer for all others (A0-A7, PC, SR, FPCONTROL etc).
184
   Note, for registers which contain addresses return pointer to void,
185
   not pointer to char, because we don't want to attempt to print
186
   the string after printing the address.  */
187
 
188
#define REGISTER_VIRTUAL_TYPE(N) \
189
  ((unsigned) (N) >= FPC_REGNUM ? lookup_pointer_type (builtin_type_void) : \
190
   (unsigned) (N) >= FP0_REGNUM ? builtin_type_double :                     \
191
   (unsigned) (N) >=  A0_REGNUM ? lookup_pointer_type (builtin_type_void) : \
192
   builtin_type_int)
193
 
194
/* Initializer for an array of names of registers.
195
   Entries beyond the first NUM_REGS are ignored.  */
196
 
197
#define REGISTER_NAMES  \
198
 {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
199
  "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
200
  "ps", "pc",  \
201
  "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
202
  "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" }
203
 
204
/* Register numbers of various important registers.
205
   Note that some of these values are "real" register numbers,
206
   and correspond to the general registers of the machine,
207
   and some are "phony" register numbers which are too large
208
   to be actual register numbers as far as the user is concerned
209
   but do serve to get the desired values when passed to read_register.  */
210
 
211
#define D0_REGNUM 0
212
#define A0_REGNUM 8
213
#define A1_REGNUM 9
214
#define FP_REGNUM 14            /* Contains address of executing stack frame */
215
#define SP_REGNUM 15            /* Contains address of top of stack */
216
#define PS_REGNUM 16            /* Contains processor status */
217
#define PC_REGNUM 17            /* Contains program counter */
218
#define FP0_REGNUM 18           /* Floating point register 0 */
219
#define FPC_REGNUM 26           /* 68881 control register */
220
#define FPS_REGNUM 27           /* 68881 status register */
221
#define FPI_REGNUM 28           /* 68881 iaddr register */
222
 
223
/* Store the address of the place in which to copy the structure the
224
   subroutine will return.  This is called from call_function. */
225
 
226
#define STORE_STRUCT_RETURN(ADDR, SP) \
227
  { write_register (A1_REGNUM, (ADDR)); }
228
 
229
/* Extract from an array REGBUF containing the (raw) register state
230
   a function return value of type TYPE, and copy that, in virtual format,
231
   into VALBUF.  This is assuming that floating point values are returned
232
   as doubles in d0/d1.  */
233
 
234
#if !defined (EXTRACT_RETURN_VALUE)
235
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
236
  memcpy ((VALBUF),                                                     \
237
          (char *)(REGBUF) +                                            \
238
                 (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)),   \
239
          TYPE_LENGTH(TYPE))
240
#endif
241
 
242
/* Write into appropriate registers a function return value
243
   of type TYPE, given in virtual format.  Assumes floats are passed
244
   in d0/d1.  */
245
 
246
#if !defined (STORE_RETURN_VALUE)
247
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
248
  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
249
#endif
250
 
251
/* Extract from an array REGBUF containing the (raw) register state
252
   the address in which a function should return its structure value,
253
   as a CORE_ADDR (or an expression that can be used as one).  */
254
 
255
#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
256
 
257
/* Describe the pointer in each stack frame to the previous stack frame
258
   (its caller).  */
259
 
260
/* FRAME_CHAIN takes a frame's nominal address and produces the frame's
261
   chain-pointer.
262
   In the case of the 68000, the frame's nominal address
263
   is the address of a 4-byte word containing the calling frame's address.  */
264
 
265
/* If we are chaining from sigtramp, then manufacture a sigtramp frame
266
   (which isn't really on the stack.  I'm not sure this is right for anything
267
   but BSD4.3 on an hp300.  */
268
#define FRAME_CHAIN(thisframe)  \
269
  (thisframe->signal_handler_caller \
270
   ? thisframe->frame \
271
   : (!inside_entry_file ((thisframe)->pc) \
272
      ? read_memory_integer ((thisframe)->frame, 4) \
273
      : 0))
274
 
275
/* Define other aspects of the stack frame.  */
276
 
277
/* A macro that tells us whether the function invocation represented
278
   by FI does not have a frame on the stack associated with it.  If it
279
   does not, FRAMELESS is set to 1, else 0.  */
280
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
281
     (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue(FI))
282
 
283
/* This was determined by experimentation on hp300 BSD 4.3.  Perhaps
284
   it corresponds to some offset in /usr/include/sys/user.h or
285
   something like that.  Using some system include file would
286
   have the advantage of probably being more robust in the face
287
   of OS upgrades, but the disadvantage of being wrong for
288
   cross-debugging.  */
289
 
290
#define SIG_PC_FP_OFFSET 530
291
 
292
#define FRAME_SAVED_PC(FRAME) \
293
  (((FRAME)->signal_handler_caller \
294
    ? ((FRAME)->next \
295
       ? read_memory_integer ((FRAME)->next->frame + SIG_PC_FP_OFFSET, 4) \
296
       : read_memory_integer (read_register (SP_REGNUM) \
297
                              + SIG_PC_FP_OFFSET - 8, 4) \
298
       ) \
299
    : read_memory_integer ((FRAME)->frame + 4, 4)) \
300
   )
301
 
302
#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
303
 
304
#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
305
 
306
/* Set VAL to the number of args passed to frame described by FI.
307
   Can set VAL to -1, meaning no way to tell.  */
308
 
309
/* We can't tell how many args there are
310
   now that the C compiler delays popping them.  */
311
#if !defined (FRAME_NUM_ARGS)
312
#define FRAME_NUM_ARGS(fi) (-1)
313
#endif
314
 
315
/* Return number of bytes at start of arglist that are not really args.  */
316
 
317
#define FRAME_ARGS_SKIP 8
318
 
319
/* Put here the code to store, into a struct frame_saved_regs,
320
   the addresses of the saved registers of frame described by FRAME_INFO.
321
   This includes special registers such as pc and fp saved in special
322
   ways in the stack frame.  sp is even more special:
323
   the address we return for it IS the sp for the next frame.  */
324
 
325
#if !defined (FRAME_FIND_SAVED_REGS)
326
#define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr))
327
#endif /* no FIND_FRAME_SAVED_REGS.  */
328
 
329
 
330
/* Things needed for making the inferior call functions.  */
331
 
332
/* The CALL_DUMMY macro is the sequence of instructions, as disassembled
333
   by gdb itself:
334
 
335
   These instructions exist only so that m68k_find_saved_regs can parse
336
   them as a "prologue"; they are never executed.
337
 
338
   fmovemx fp0-fp7,sp@-                 0xf227 0xe0ff
339
   moveml d0-a5,sp@-                    0x48e7 0xfffc
340
   clrw sp@-                            0x4267
341
   movew ccr,sp@-                               0x42e7
342
 
343
   The arguments are pushed at this point by GDB; no code is needed in
344
   the dummy for this.  The CALL_DUMMY_START_OFFSET gives the position
345
   of the following jsr instruction.  That is where we start
346
   executing.
347
 
348
   jsr @#0x32323232                     0x4eb9 0x3232 0x3232
349
   addal #0x69696969,sp                 0xdffc 0x6969 0x6969
350
   trap #<your BPT_VECTOR number here>  0x4e4?
351
   nop                                  0x4e71
352
 
353
   Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
354
 
355
   The dummy frame always saves the floating-point registers, whether they
356
   actually exist on this target or not.  */
357
 
358
/* FIXME: Wrong to hardwire this as BPT_VECTOR when sometimes it
359
   should be REMOTE_BPT_VECTOR.  Best way to fix it would be to define
360
   CALL_DUMMY_BREAKPOINT_OFFSET.  */
361
 
362
#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
363
#define CALL_DUMMY_LENGTH 28    /* Size of CALL_DUMMY */
364
#define CALL_DUMMY_START_OFFSET 12      /* Offset to jsr instruction */
365
#define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12)
366
 
367
/* Insert the specified number of args and function address
368
   into a call sequence of the above form stored at DUMMYNAME.
369
   We use the BFD routines to store a big-endian value of known size.  */
370
 
371
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
372
{ bfd_putb32 (fun,     (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
373
  bfd_putb32 (nargs*4, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
374
 
375
/* Push an empty stack frame, to record the current PC, etc.  */
376
 
377
#define PUSH_DUMMY_FRAME        { m68k_push_dummy_frame (); }
378
 
379
extern void m68k_push_dummy_frame (void);
380
 
381
extern void m68k_pop_frame (void);
382
 
383
/* Discard from the stack the innermost frame, restoring all registers.  */
384
 
385
#define POP_FRAME               { m68k_pop_frame (); }
386
 
387
/* Offset from SP to first arg on stack at first instruction of a function */
388
 
389
#define SP_ARG0 (1 * 4)
390
 
391
#define TARGET_M68K
392
 
393
/* Figure out where the longjmp will land.  Slurp the args out of the stack.
394
   We expect the first arg to be a pointer to the jmp_buf structure from which
395
   we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
396
   This routine returns true on success */
397
 
398
extern int m68k_get_longjmp_target (CORE_ADDR *);

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