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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [config/] [m68k/] [tm-m68k.h] - Blame information for rev 1765

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1 106 markom
/* Parameters for execution on a 68000 series machine.
2
   Copyright 1986, 1987, 1989, 1990, 1992 Free Software Foundation, Inc.
3
 
4
   This file is part of GDB.
5
 
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.
10
 
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.
15
 
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.  */
20
 
21
/* Generic 68000 stuff, to be included by other tm-*.h files.  */
22
 
23
#define IEEE_FLOAT 1
24
 
25
/* Define the bit, byte, and word ordering of the machine.  */
26
#define TARGET_BYTE_ORDER BIG_ENDIAN
27
 
28
/* Offset from address of function to start of its code.
29
   Zero on most machines.  */
30
 
31
#define FUNCTION_START_OFFSET 0
32
 
33
/* Advance PC across any function entry prologue instructions
34
   to reach some "real" code.  */
35
 
36
#if !defined(SKIP_PROLOGUE)
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#define SKIP_PROLOGUE(ip) (m68k_skip_prologue (ip))
38
#endif
39
extern CORE_ADDR m68k_skip_prologue PARAMS ((CORE_ADDR ip));
40
 
41
/* Immediately after a function call, return the saved pc.
42
   Can't always go through the frames for this because on some machines
43
   the new frame is not set up until the new function executes
44
   some instructions.  */
45
 
46
struct frame_info;
47
struct frame_saved_regs;
48
 
49
extern CORE_ADDR m68k_saved_pc_after_call PARAMS ((struct frame_info *));
50
extern void m68k_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
51
 
52
#define SAVED_PC_AFTER_CALL(frame) \
53
  m68k_saved_pc_after_call(frame)
54
 
55
/* Stack grows downward.  */
56
 
57
#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
58
 
59
/* Stack must be kept short aligned when doing function calls.  */
60
 
61
#define STACK_ALIGN(ADDR) (((ADDR) + 1) & ~1)
62
 
63
/* Sequence of bytes for breakpoint instruction.
64
   This is a TRAP instruction.  The last 4 bits (0xf below) is the
65
   vector.  Systems which don't use 0xf should define BPT_VECTOR
66
   themselves before including this file.  */
67
 
68
#if !defined (BPT_VECTOR)
69
#define BPT_VECTOR 0xf
70
#endif
71
 
72
#if !defined (BREAKPOINT)
73
#define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
74
#endif
75
 
76
/* We default to vector 1 for the "remote" target, but allow targets
77
   to override.  */
78
#if !defined (REMOTE_BPT_VECTOR)
79
#define REMOTE_BPT_VECTOR 1
80
#endif
81
 
82
#if !defined (REMOTE_BREAKPOINT)
83
#define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)}
84
#endif
85
 
86
/* If your kernel resets the pc after the trap happens you may need to
87
   define this before including this file.  */
88
 
89
#if !defined (DECR_PC_AFTER_BREAK)
90
#define DECR_PC_AFTER_BREAK 2
91
#endif
92
 
93
/* Say how long (ordinary) registers are.  This is a piece of bogosity
94
   used in push_word and a few other places; REGISTER_RAW_SIZE is the
95
   real way to know how big a register is.  */
96
 
97
#define REGISTER_SIZE 4
98
 
99
#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
100
#define REGISTER_BYTES_NOFP (16*4 + 8)
101
 
102
#ifndef NUM_REGS
103
#define NUM_REGS 29
104
#endif
105
 
106
#define NUM_FREGS (NUM_REGS-24)
107
 
108
#ifndef REGISTER_BYTES_OK
109
#define REGISTER_BYTES_OK(b) \
110
   ((b) == REGISTER_BYTES_FP \
111
    || (b) == REGISTER_BYTES_NOFP)
112
#endif
113
 
114
#ifndef REGISTER_BYTES
115
#define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
116
#endif
117
 
118
/* Index within `registers' of the first byte of the space for
119
   register N.  */
120
 
121
#define REGISTER_BYTE(N)  \
122
 ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168    \
123
  : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72  \
124
  : (N) * 4)
125
 
126
/* Number of bytes of storage in the actual machine representation
127
   for register N.  On the 68000, all regs are 4 bytes
128
   except the floating point regs which are 12 bytes.  */
129
/* Note that the unsigned cast here forces the result of the
130
   subtraction to very high positive values if N < FP0_REGNUM */
131
 
132
#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
133
 
134
/* Number of bytes of storage in the program's representation
135
   for register N.  On the 68000, all regs are 4 bytes
136
   except the floating point regs which are 8-byte doubles.  */
137
 
138
#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
139
 
140
/* Largest value REGISTER_RAW_SIZE can have.  */
141
 
142
#define MAX_REGISTER_RAW_SIZE 12
143
 
144
/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
145
 
146
#define MAX_REGISTER_VIRTUAL_SIZE 8
147
 
148
/* Nonzero if register N requires conversion
149
   from raw format to virtual format.  */
150
 
151
#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
152
 
153
#include "floatformat.h"
154
 
155
/* Convert data from raw format for register REGNUM in buffer FROM
156
   to virtual format with type TYPE in buffer TO.  */
157
 
158
#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
159
do                                                                      \
160
  {                                                                     \
161
    DOUBLEST dbl_tmp_val;                                                       \
162
    floatformat_to_doublest (&floatformat_m68881_ext, (FROM), &dbl_tmp_val); \
163
    store_floating ((TO), TYPE_LENGTH (TYPE), dbl_tmp_val);             \
164
  } while (0)
165
 
166
/* Convert data from virtual format with type TYPE in buffer FROM
167
   to raw format for register REGNUM in buffer TO.  */
168
 
169
#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO)    \
170
do                                                                      \
171
  {                                                                     \
172
    DOUBLEST dbl_tmp_val;                                               \
173
    dbl_tmp_val = extract_floating ((FROM), TYPE_LENGTH (TYPE));        \
174
    floatformat_from_doublest (&floatformat_m68881_ext, &dbl_tmp_val, (TO)); \
175
  } while (0)
176
 
177
/* Return the GDB type object for the "standard" data type of data
178
   in register N.  This should be int for D0-D7, double for FP0-FP7,
179
   and void pointer for all others (A0-A7, PC, SR, FPCONTROL etc).
180
   Note, for registers which contain addresses return pointer to void,
181
   not pointer to char, because we don't want to attempt to print
182
   the string after printing the address.  */
183
 
184
#define REGISTER_VIRTUAL_TYPE(N) \
185
  ((unsigned) (N) >= FPC_REGNUM ? lookup_pointer_type (builtin_type_void) : \
186
   (unsigned) (N) >= FP0_REGNUM ? builtin_type_double :                     \
187
   (unsigned) (N) >=  A0_REGNUM ? lookup_pointer_type (builtin_type_void) : \
188
   builtin_type_int)
189
 
190
/* Initializer for an array of names of registers.
191
   Entries beyond the first NUM_REGS are ignored.  */
192
 
193
#define REGISTER_NAMES  \
194
 {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
195
  "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
196
  "ps", "pc",  \
197
  "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
198
  "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" }
199
 
200
/* Register numbers of various important registers.
201
   Note that some of these values are "real" register numbers,
202
   and correspond to the general registers of the machine,
203
   and some are "phony" register numbers which are too large
204
   to be actual register numbers as far as the user is concerned
205
   but do serve to get the desired values when passed to read_register.  */
206
 
207
#define D0_REGNUM 0
208
#define A0_REGNUM 8
209
#define A1_REGNUM 9
210
#define FP_REGNUM 14            /* Contains address of executing stack frame */
211
#define SP_REGNUM 15            /* Contains address of top of stack */
212
#define PS_REGNUM 16            /* Contains processor status */
213
#define PC_REGNUM 17            /* Contains program counter */
214
#define FP0_REGNUM 18           /* Floating point register 0 */
215
#define FPC_REGNUM 26           /* 68881 control register */
216
#define FPS_REGNUM 27           /* 68881 status register */
217
#define FPI_REGNUM 28           /* 68881 iaddr register */
218
 
219
/* Store the address of the place in which to copy the structure the
220
   subroutine will return.  This is called from call_function. */
221
 
222
#define STORE_STRUCT_RETURN(ADDR, SP) \
223
  { write_register (A1_REGNUM, (ADDR)); }
224
 
225
/* Extract from an array REGBUF containing the (raw) register state
226
   a function return value of type TYPE, and copy that, in virtual format,
227
   into VALBUF.  This is assuming that floating point values are returned
228
   as doubles in d0/d1.  */
229
 
230
#if !defined (EXTRACT_RETURN_VALUE)
231
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
232
  memcpy ((VALBUF),                                                     \
233
          (char *)(REGBUF) +                                            \
234
                 (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)),   \
235
          TYPE_LENGTH(TYPE))
236
#endif
237
 
238
/* Write into appropriate registers a function return value
239
   of type TYPE, given in virtual format.  Assumes floats are passed
240
   in d0/d1.  */
241
 
242
#if !defined (STORE_RETURN_VALUE)
243
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
244
  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
245
#endif
246
 
247
/* Extract from an array REGBUF containing the (raw) register state
248
   the address in which a function should return its structure value,
249
   as a CORE_ADDR (or an expression that can be used as one).  */
250
 
251
#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
252
 
253
/* Describe the pointer in each stack frame to the previous stack frame
254
   (its caller).  */
255
 
256
/* FRAME_CHAIN takes a frame's nominal address and produces the frame's
257
   chain-pointer.
258
   In the case of the 68000, the frame's nominal address
259
   is the address of a 4-byte word containing the calling frame's address.  */
260
 
261
/* If we are chaining from sigtramp, then manufacture a sigtramp frame
262
   (which isn't really on the stack.  I'm not sure this is right for anything
263
   but BSD4.3 on an hp300.  */
264
#define FRAME_CHAIN(thisframe)  \
265
  (thisframe->signal_handler_caller \
266
   ? thisframe->frame \
267
   : (!inside_entry_file ((thisframe)->pc) \
268
      ? read_memory_integer ((thisframe)->frame, 4) \
269
      : 0))
270
 
271
/* Define other aspects of the stack frame.  */
272
 
273
/* A macro that tells us whether the function invocation represented
274
   by FI does not have a frame on the stack associated with it.  If it
275
   does not, FRAMELESS is set to 1, else 0.  */
276
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
277
     (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue(FI))
278
 
279
/* This was determined by experimentation on hp300 BSD 4.3.  Perhaps
280
   it corresponds to some offset in /usr/include/sys/user.h or
281
   something like that.  Using some system include file would
282
   have the advantage of probably being more robust in the face
283
   of OS upgrades, but the disadvantage of being wrong for
284
   cross-debugging.  */
285
 
286
#define SIG_PC_FP_OFFSET 530
287
 
288
#define FRAME_SAVED_PC(FRAME) \
289
  (((FRAME)->signal_handler_caller \
290
    ? ((FRAME)->next \
291
       ? read_memory_integer ((FRAME)->next->frame + SIG_PC_FP_OFFSET, 4) \
292
       : read_memory_integer (read_register (SP_REGNUM) \
293
                              + SIG_PC_FP_OFFSET - 8, 4) \
294
       ) \
295
    : read_memory_integer ((FRAME)->frame + 4, 4)) \
296
   )
297
 
298
#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
299
 
300
#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
301
 
302
/* Set VAL to the number of args passed to frame described by FI.
303
   Can set VAL to -1, meaning no way to tell.  */
304
 
305
/* We can't tell how many args there are
306
   now that the C compiler delays popping them.  */
307
#if !defined (FRAME_NUM_ARGS)
308
#define FRAME_NUM_ARGS(fi) (-1)
309
#endif
310
 
311
/* Return number of bytes at start of arglist that are not really args.  */
312
 
313
#define FRAME_ARGS_SKIP 8
314
 
315
/* Put here the code to store, into a struct frame_saved_regs,
316
   the addresses of the saved registers of frame described by FRAME_INFO.
317
   This includes special registers such as pc and fp saved in special
318
   ways in the stack frame.  sp is even more special:
319
   the address we return for it IS the sp for the next frame.  */
320
 
321
#if !defined (FRAME_FIND_SAVED_REGS)
322
#define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr))
323
#endif /* no FIND_FRAME_SAVED_REGS.  */
324
 
325
 
326
/* Things needed for making the inferior call functions.  */
327
 
328
/* The CALL_DUMMY macro is the sequence of instructions, as disassembled
329
   by gdb itself:
330
 
331
   These instructions exist only so that m68k_find_saved_regs can parse
332
   them as a "prologue"; they are never executed.
333
 
334
   fmovemx fp0-fp7,sp@-                 0xf227 0xe0ff
335
   moveml d0-a5,sp@-                    0x48e7 0xfffc
336
   clrw sp@-                            0x4267
337
   movew ccr,sp@-                               0x42e7
338
 
339
   The arguments are pushed at this point by GDB; no code is needed in
340
   the dummy for this.  The CALL_DUMMY_START_OFFSET gives the position
341
   of the following jsr instruction.  That is where we start
342
   executing.
343
 
344
   jsr @#0x32323232                     0x4eb9 0x3232 0x3232
345
   addal #0x69696969,sp                 0xdffc 0x6969 0x6969
346
   trap #<your BPT_VECTOR number here>  0x4e4?
347
   nop                                  0x4e71
348
 
349
   Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
350
 
351
   The dummy frame always saves the floating-point registers, whether they
352
   actually exist on this target or not.  */
353
 
354
/* FIXME: Wrong to hardwire this as BPT_VECTOR when sometimes it
355
   should be REMOTE_BPT_VECTOR.  Best way to fix it would be to define
356
   CALL_DUMMY_BREAKPOINT_OFFSET.  */
357
 
358
#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
359
#define CALL_DUMMY_LENGTH 28    /* Size of CALL_DUMMY */
360
#define CALL_DUMMY_START_OFFSET 12      /* Offset to jsr instruction */
361
#define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12)
362
 
363
/* Insert the specified number of args and function address
364
   into a call sequence of the above form stored at DUMMYNAME.
365
   We use the BFD routines to store a big-endian value of known size.  */
366
 
367
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
368
{ bfd_putb32 (fun,     (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
369
  bfd_putb32 (nargs*4, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
370
 
371
/* Push an empty stack frame, to record the current PC, etc.  */
372
 
373
#define PUSH_DUMMY_FRAME        { m68k_push_dummy_frame (); }
374
 
375
extern void m68k_push_dummy_frame PARAMS ((void));
376
 
377
extern void m68k_pop_frame PARAMS ((void));
378
 
379
/* Discard from the stack the innermost frame, restoring all registers.  */
380
 
381
#define POP_FRAME               { m68k_pop_frame (); }
382
 
383
/* Offset from SP to first arg on stack at first instruction of a function */
384
 
385
#define SP_ARG0 (1 * 4)
386
 
387
#define TARGET_M68K

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