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