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c906108c | 1 | /* Parameters for execution on a 68000 series machine. |
b6ba6518 KB |
2 | Copyright 1986, 1987, 1989, 1990, 1992, 1993, 1994, 1995, 1996, 1998, |
3 | 1999, 2000 Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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. | |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b JM |
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. */ | |
c906108c SS |
21 | |
22 | /* Generic 68000 stuff, to be included by other tm-*.h files. */ | |
23 | ||
7355ddba | 24 | #define IEEE_FLOAT (1) |
c906108c SS |
25 | |
26 | /* Define the bit, byte, and word ordering of the machine. */ | |
27 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
28 | ||
29 | /* Offset from address of function to start of its code. | |
30 | Zero on most machines. */ | |
31 | ||
32 | #define FUNCTION_START_OFFSET 0 | |
33 | ||
34 | /* Advance PC across any function entry prologue instructions | |
35 | to reach some "real" code. */ | |
36 | ||
37 | #if !defined(SKIP_PROLOGUE) | |
b83266a0 | 38 | #define SKIP_PROLOGUE(ip) (m68k_skip_prologue (ip)) |
c906108c | 39 | #endif |
a14ed312 | 40 | extern CORE_ADDR m68k_skip_prologue (CORE_ADDR ip); |
c906108c SS |
41 | |
42 | /* Immediately after a function call, return the saved pc. | |
43 | Can't always go through the frames for this because on some machines | |
44 | the new frame is not set up until the new function executes | |
45 | some instructions. */ | |
46 | ||
c906108c SS |
47 | struct frame_info; |
48 | struct frame_saved_regs; | |
c906108c | 49 | |
a14ed312 KB |
50 | extern CORE_ADDR m68k_saved_pc_after_call (struct frame_info *); |
51 | extern void m68k_find_saved_regs (struct frame_info *, | |
52 | struct frame_saved_regs *); | |
c906108c SS |
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. */ | |
392a587b JM |
278 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
279 | (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue(FI)) | |
c906108c SS |
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) | |
392a587b | 310 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
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. */ | |
c906108c | 326 | \f |
c5aa993b | 327 | |
c906108c SS |
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 | ||
c5aa993b JM |
336 | fmovemx fp0-fp7,sp@- 0xf227 0xe0ff |
337 | moveml d0-a5,sp@- 0x48e7 0xfffc | |
338 | clrw sp@- 0x4267 | |
339 | movew ccr,sp@- 0x42e7 | |
c906108c SS |
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 | ||
c5aa993b JM |
346 | jsr @#0x32323232 0x4eb9 0x3232 0x3232 |
347 | addal #0x69696969,sp 0xdffc 0x6969 0x6969 | |
348 | trap #<your BPT_VECTOR number here> 0x4e4? | |
349 | nop 0x4e71 | |
c906108c SS |
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))} | |
c5aa993b JM |
361 | #define CALL_DUMMY_LENGTH 28 /* Size of CALL_DUMMY */ |
362 | #define CALL_DUMMY_START_OFFSET 12 /* Offset to jsr instruction */ | |
c906108c SS |
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 | ||
a14ed312 | 377 | extern void m68k_push_dummy_frame (void); |
c906108c | 378 | |
a14ed312 | 379 | extern void m68k_pop_frame (void); |
c906108c SS |
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 | |
f4281f55 AC |
390 | |
391 | /* Figure out where the longjmp will land. Slurp the args out of the stack. | |
392 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
393 | we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR. | |
394 | This routine returns true on success */ | |
395 | ||
396 | extern int m68k_get_longjmp_target (CORE_ADDR *); |