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5076de82 FF |
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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* Generic 68000 stuff, to be included by other tm-*.h files. | |
21 | Define HAVE_68881 if that is the case. */ | |
22 | ||
23 | #if defined (HAVE_68881) | |
24 | #define IEEE_FLOAT 1 | |
25 | #endif | |
26 | ||
27 | /* Define the bit, byte, and word ordering of the machine. */ | |
28 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
29 | ||
30 | /* Offset from address of function to start of its code. | |
31 | Zero on most machines. */ | |
32 | ||
33 | #define FUNCTION_START_OFFSET 0 | |
34 | ||
35 | /* Advance PC across any function entry prologue instructions | |
36 | to reach some "real" code. */ | |
37 | ||
38 | #if !defined(SKIP_PROLOGUE) | |
39 | #define SKIP_PROLOGUE(ip) {(ip) = m68k_skip_prologue(ip);} | |
40 | extern CORE_ADDR m68k_skip_prologue PARAMS ((CORE_ADDR ip)); | |
41 | #endif | |
42 | ||
43 | /* Immediately after a function call, return the saved pc. | |
44 | Can't always go through the frames for this because on some machines | |
45 | the new frame is not set up until the new function executes | |
46 | some instructions. */ | |
47 | ||
48 | #define SAVED_PC_AFTER_CALL(frame) \ | |
49 | read_memory_integer (read_register (SP_REGNUM), 4) | |
50 | ||
51 | /* Stack grows downward. */ | |
52 | ||
53 | #define INNER_THAN < | |
54 | ||
55 | /* Sequence of bytes for breakpoint instruction. | |
56 | This is a TRAP instruction. The last 4 bits (0xf below) is the | |
57 | vector. Systems which don't use 0xf should define BPT_VECTOR | |
58 | themselves before including this file. */ | |
59 | ||
60 | #if !defined (BPT_VECTOR) | |
61 | #define BPT_VECTOR 0xf | |
62 | #endif | |
63 | ||
64 | #if !defined (BREAKPOINT) | |
65 | #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} | |
66 | #endif | |
67 | ||
5af4f5f6 JK |
68 | /* We always use vector 1 for the "remote" target. This is hardcoded in |
69 | m68k-stub.c. */ | |
70 | #define REMOTE_BPT_VECTOR 1 | |
71 | #define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)} | |
72 | ||
5076de82 FF |
73 | /* If your kernel resets the pc after the trap happens you may need to |
74 | define this before including this file. */ | |
75 | ||
76 | #if !defined (DECR_PC_AFTER_BREAK) | |
77 | #define DECR_PC_AFTER_BREAK 2 | |
78 | #endif | |
79 | ||
80 | /* Nonzero if instruction at PC is a return instruction. */ | |
81 | /* Allow any of the return instructions, including a trapv and a return | |
82 | from interupt. */ | |
83 | ||
84 | #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74) | |
85 | ||
86 | /* Return 1 if P points to an invalid floating point value. */ | |
87 | ||
88 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ | |
89 | ||
90 | /* Say how long registers are. */ | |
91 | ||
92 | #define REGISTER_TYPE long | |
93 | ||
94 | #if defined (HAVE_68881) | |
95 | # if defined (GDB_TARGET_IS_SUN3) | |
96 | /* Sun3 status includes fpflags, which shows whether the FPU has been used | |
97 | by the process, and whether the FPU was done with an instruction or | |
98 | was interrupted in the middle of a long instruction. See | |
99 | <machine/reg.h>. */ | |
100 | /* a&d, pc,sr, fp, fpstat, fpflags */ | |
101 | # define NUM_REGS 31 | |
102 | # define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4) | |
103 | # else /* Not sun3. */ | |
104 | # define NUM_REGS 29 | |
105 | # define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4) | |
106 | # endif /* Not sun3. */ | |
107 | #else /* No 68881. */ | |
108 | # define NUM_REGS 18 | |
109 | # define REGISTER_BYTES (16*4 + 8) | |
110 | #endif /* No 68881. */ | |
111 | ||
112 | /* Index within `registers' of the first byte of the space for | |
113 | register N. */ | |
114 | ||
115 | #if defined (HAVE_68881) | |
116 | #define REGISTER_BYTE(N) \ | |
117 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \ | |
118 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \ | |
119 | : (N) * 4) | |
120 | ||
121 | /* Number of bytes of storage in the actual machine representation | |
122 | for register N. On the 68000, all regs are 4 bytes | |
123 | except the floating point regs which are 12 bytes. */ | |
124 | /* Note that the unsigned cast here forces the result of the | |
125 | subtraction to very high positive values if N < FP0_REGNUM */ | |
126 | ||
127 | #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4) | |
128 | ||
129 | /* Number of bytes of storage in the program's representation | |
130 | for register N. On the 68000, all regs are 4 bytes | |
131 | except the floating point regs which are 8-byte doubles. */ | |
132 | ||
133 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4) | |
134 | ||
135 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
136 | ||
137 | #define MAX_REGISTER_RAW_SIZE 12 | |
138 | ||
139 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
140 | ||
141 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
142 | ||
143 | /* Nonzero if register N requires conversion | |
144 | from raw format to virtual format. */ | |
145 | ||
146 | #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8) | |
147 | ||
148 | /* Put the declaration out here because if it's in the macros, PCC | |
149 | will complain. */ | |
150 | extern const struct ext_format ext_format_68881; | |
151 | ||
152 | /* Convert data from raw format for register REGNUM | |
153 | to virtual format for register REGNUM. */ | |
154 | ||
155 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ | |
156 | { \ | |
157 | if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ | |
158 | ieee_extended_to_double (&ext_format_68881, (FROM), (double *)(TO)); \ | |
159 | else \ | |
160 | memcpy ((TO), (FROM), 4); \ | |
161 | } | |
162 | ||
163 | /* Convert data from virtual format for register REGNUM | |
164 | to raw format for register REGNUM. */ | |
165 | ||
166 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ | |
167 | { \ | |
168 | if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ | |
169 | double_to_ieee_extended (&ext_format_68881, (double *)(FROM), (TO)); \ | |
170 | else \ | |
171 | memcpy ((TO), (FROM), 4); \ | |
172 | } | |
173 | ||
174 | /* Return the GDB type object for the "standard" data type | |
175 | of data in register N. */ | |
176 | /* Note, for registers which contain addresses return | |
177 | pointer to void, not pointer to char, because we don't | |
178 | want to attempt to print the string after printing the address. */ | |
179 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
180 | (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : \ | |
181 | (N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ? \ | |
182 | lookup_pointer_type (builtin_type_void) : builtin_type_int) | |
183 | ||
184 | #else /* no 68881. */ | |
185 | /* Index within `registers' of the first byte of the space for | |
186 | register N. */ | |
187 | ||
188 | #define REGISTER_BYTE(N) ((N) * 4) | |
189 | ||
190 | /* Number of bytes of storage in the actual machine representation | |
191 | for register N. On the 68000, all regs are 4 bytes. */ | |
192 | ||
193 | #define REGISTER_RAW_SIZE(N) 4 | |
194 | ||
195 | /* Number of bytes of storage in the program's representation | |
196 | for register N. On the 68000, all regs are 4 bytes. */ | |
197 | ||
198 | #define REGISTER_VIRTUAL_SIZE(N) 4 | |
199 | ||
200 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
201 | ||
202 | #define MAX_REGISTER_RAW_SIZE 4 | |
203 | ||
204 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
205 | ||
206 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
207 | ||
208 | /* Nonzero if register N requires conversion | |
209 | from raw format to virtual format. */ | |
210 | ||
211 | #define REGISTER_CONVERTIBLE(N) 0 | |
212 | ||
213 | /* Convert data from raw format for register REGNUM | |
214 | to virtual format for register REGNUM. */ | |
215 | ||
216 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4); | |
217 | ||
218 | /* Convert data from virtual format for register REGNUM | |
219 | to raw format for register REGNUM. */ | |
220 | ||
221 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4); | |
222 | ||
223 | /* Return the GDB type object for the "standard" data type | |
224 | of data in register N. */ | |
225 | ||
226 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int | |
227 | ||
228 | #endif /* No 68881. */ | |
229 | ||
230 | /* Initializer for an array of names of registers. | |
231 | Entries beyond the first NUM_REGS are ignored. */ | |
232 | ||
233 | #define REGISTER_NAMES \ | |
234 | {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \ | |
235 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \ | |
236 | "ps", "pc", \ | |
237 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \ | |
238 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" } | |
239 | ||
240 | /* Register numbers of various important registers. | |
241 | Note that some of these values are "real" register numbers, | |
242 | and correspond to the general registers of the machine, | |
243 | and some are "phony" register numbers which are too large | |
244 | to be actual register numbers as far as the user is concerned | |
245 | but do serve to get the desired values when passed to read_register. */ | |
246 | ||
247 | #define A1_REGNUM 9 | |
248 | #define FP_REGNUM 14 /* Contains address of executing stack frame */ | |
249 | #define SP_REGNUM 15 /* Contains address of top of stack */ | |
250 | #define PS_REGNUM 16 /* Contains processor status */ | |
251 | #define PC_REGNUM 17 /* Contains program counter */ | |
252 | #if defined (HAVE_68881) | |
253 | #define FP0_REGNUM 18 /* Floating point register 0 */ | |
254 | #define FPC_REGNUM 26 /* 68881 control register */ | |
255 | #define FPS_REGNUM 27 /* 68881 status register */ | |
256 | #define FPI_REGNUM 28 /* 68881 iaddr register */ | |
257 | #endif /* 68881. */ | |
258 | ||
259 | /* Store the address of the place in which to copy the structure the | |
260 | subroutine will return. This is called from call_function. */ | |
261 | ||
262 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
263 | { write_register (A1_REGNUM, (ADDR)); } | |
264 | ||
265 | /* Extract from an array REGBUF containing the (raw) register state | |
266 | a function return value of type TYPE, and copy that, in virtual format, | |
267 | into VALBUF. This is assuming that floating point values are returned | |
268 | as doubles in d0/d1. */ | |
269 | ||
270 | #if !defined (EXTRACT_RETURN_VALUE) | |
271 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
272 | memcpy ((VALBUF), \ | |
273 | (char *)(REGBUF) + \ | |
274 | (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \ | |
275 | TYPE_LENGTH(TYPE)) | |
276 | #endif | |
277 | ||
278 | /* Write into appropriate registers a function return value | |
279 | of type TYPE, given in virtual format. Assumes floats are passed | |
280 | in d0/d1. */ | |
281 | ||
282 | #if !defined (STORE_RETURN_VALUE) | |
283 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
284 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
285 | #endif | |
286 | ||
287 | /* Extract from an array REGBUF containing the (raw) register state | |
288 | the address in which a function should return its structure value, | |
289 | as a CORE_ADDR (or an expression that can be used as one). */ | |
290 | ||
291 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
292 | \f | |
293 | /* Describe the pointer in each stack frame to the previous stack frame | |
294 | (its caller). */ | |
295 | ||
296 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
297 | chain-pointer. | |
298 | In the case of the 68000, the frame's nominal address | |
299 | is the address of a 4-byte word containing the calling frame's address. */ | |
300 | ||
993583e5 JK |
301 | /* If we are chaining from sigtramp, then manufacture a sigtramp frame |
302 | (which isn't really on the stack. I'm not sure this is right for anything | |
303 | but BSD4.3 on an hp300. */ | |
5076de82 | 304 | #define FRAME_CHAIN(thisframe) \ |
993583e5 JK |
305 | (thisframe->signal_handler_caller \ |
306 | ? thisframe->frame \ | |
80ddbedc RP |
307 | : (!inside_entry_file ((thisframe)->pc) \ |
308 | ? read_memory_integer ((thisframe)->frame, 4) \ | |
309 | : 0)) | |
5076de82 FF |
310 | |
311 | /* Define other aspects of the stack frame. */ | |
312 | ||
313 | /* A macro that tells us whether the function invocation represented | |
314 | by FI does not have a frame on the stack associated with it. If it | |
315 | does not, FRAMELESS is set to 1, else 0. */ | |
316 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
993583e5 JK |
317 | do { \ |
318 | if ((FI)->signal_handler_caller) \ | |
319 | (FRAMELESS) = 0; \ | |
320 | else \ | |
321 | (FRAMELESS) = frameless_look_for_prologue(FI); \ | |
322 | } while (0) | |
323 | ||
324 | /* This was determined by experimentation on hp300 BSD 4.3. Perhaps | |
325 | it corresponds to some offset in /usr/include/sys/user.h or | |
326 | something like that. Using some system include file would | |
327 | have the advantage of probably being more robust in the face | |
328 | of OS upgrades, but the disadvantage of being wrong for | |
329 | cross-debugging. */ | |
330 | ||
331 | #define SIG_PC_FP_OFFSET 530 | |
332 | ||
333 | #define FRAME_SAVED_PC(FRAME) \ | |
334 | (((FRAME)->signal_handler_caller \ | |
335 | ? ((FRAME)->next \ | |
336 | ? read_memory_integer ((FRAME)->next->frame + SIG_PC_FP_OFFSET, 4) \ | |
337 | : read_memory_integer (read_register (SP_REGNUM) \ | |
338 | + SIG_PC_FP_OFFSET - 8, 4) \ | |
339 | ) \ | |
340 | : read_memory_integer ((FRAME)->frame + 4, 4)) \ | |
341 | ) | |
5076de82 FF |
342 | |
343 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
344 | ||
345 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
346 | ||
347 | /* Set VAL to the number of args passed to frame described by FI. | |
348 | Can set VAL to -1, meaning no way to tell. */ | |
349 | ||
350 | /* We can't tell how many args there are | |
351 | now that the C compiler delays popping them. */ | |
352 | #if !defined (FRAME_NUM_ARGS) | |
353 | #define FRAME_NUM_ARGS(val,fi) (val = -1) | |
354 | #endif | |
355 | ||
356 | /* Return number of bytes at start of arglist that are not really args. */ | |
357 | ||
358 | #define FRAME_ARGS_SKIP 8 | |
359 | ||
360 | /* Put here the code to store, into a struct frame_saved_regs, | |
361 | the addresses of the saved registers of frame described by FRAME_INFO. | |
362 | This includes special registers such as pc and fp saved in special | |
363 | ways in the stack frame. sp is even more special: | |
364 | the address we return for it IS the sp for the next frame. */ | |
365 | ||
366 | #if !defined (FRAME_FIND_SAVED_REGS) | |
e7ac0161 | 367 | #define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr)) |
5076de82 FF |
368 | #endif /* no FIND_FRAME_SAVED_REGS. */ |
369 | ||
370 | \f | |
ea2455a9 | 371 | /* Things needed for making the inferior call functions. */ |
5076de82 FF |
372 | |
373 | /* The CALL_DUMMY macro is the sequence of instructions, as disassembled | |
374 | by gdb itself: | |
375 | ||
376 | fmovemx fp0-fp7,sp@- 0xf227 0xe0ff | |
377 | moveml d0-a5,sp@- 0x48e7 0xfffc | |
378 | clrw sp@- 0x4267 | |
379 | movew ccr,sp@- 0x42e7 | |
380 | ||
381 | /..* The arguments are pushed at this point by GDB; | |
382 | no code is needed in the dummy for this. | |
383 | The CALL_DUMMY_START_OFFSET gives the position of | |
384 | the following jsr instruction. *../ | |
385 | ||
386 | jsr @#0x32323232 0x4eb9 0x3232 0x3232 | |
387 | addal #0x69696969,sp 0xdffc 0x6969 0x6969 | |
388 | trap #<your BPT_VECTOR number here> 0x4e4? | |
389 | nop 0x4e71 | |
390 | ||
391 | Note this is CALL_DUMMY_LENGTH bytes (28 for the above example). | |
392 | We actually start executing at the jsr, since the pushing of the | |
393 | registers is done by PUSH_DUMMY_FRAME. If this were real code, | |
394 | the arguments for the function called by the jsr would be pushed | |
395 | between the moveml and the jsr, and we could allow it to execute through. | |
396 | But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is | |
397 | done, and we cannot allow the moveml to push the registers again lest | |
398 | they be taken for the arguments. */ | |
399 | ||
400 | #if defined (HAVE_68881) | |
401 | ||
402 | #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))} | |
403 | #define CALL_DUMMY_LENGTH 28 /* Size of CALL_DUMMY */ | |
404 | #define CALL_DUMMY_START_OFFSET 12 /* Offset to jsr instruction*/ | |
405 | ||
406 | #else | |
407 | ||
408 | #define CALL_DUMMY {0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))} | |
409 | #define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */ | |
410 | #define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction*/ | |
411 | ||
412 | #endif /* HAVE_68881 */ | |
413 | ||
414 | /* Insert the specified number of args and function address | |
415 | into a call sequence of the above form stored at DUMMYNAME. | |
416 | We use the BFD routines to store a big-endian value of known size. */ | |
417 | ||
418 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
4a87a64a ILT |
419 | { bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \ |
420 | bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); } | |
5076de82 FF |
421 | |
422 | /* Push an empty stack frame, to record the current PC, etc. */ | |
423 | ||
424 | #define PUSH_DUMMY_FRAME { m68k_push_dummy_frame (); } | |
425 | ||
426 | extern void m68k_push_dummy_frame PARAMS ((void)); | |
427 | ||
428 | extern void m68k_pop_frame PARAMS ((void)); | |
429 | ||
430 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
431 | ||
432 | #define POP_FRAME { m68k_pop_frame (); } | |
433 | ||
434 | /* Offset from SP to first arg on stack at first instruction of a function */ | |
435 | ||
436 | #define SP_ARG0 (1 * 4) |