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c906108c SS |
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* Generic 68000 stuff, to be included by other tm-*.h files. */ | |
21 | ||
22 | #define IEEE_FLOAT 1 | |
23 | ||
24 | /* Define the bit, byte, and word ordering of the machine. */ | |
25 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
26 | ||
27 | /* Offset from address of function to start of its code. | |
28 | Zero on most machines. */ | |
29 | ||
30 | #define FUNCTION_START_OFFSET 0 | |
31 | ||
32 | /* Advance PC across any function entry prologue instructions | |
33 | to reach some "real" code. */ | |
34 | ||
35 | #if !defined(SKIP_PROLOGUE) | |
b83266a0 | 36 | #define SKIP_PROLOGUE(ip) (m68k_skip_prologue (ip)) |
c906108c | 37 | #endif |
b83266a0 | 38 | extern CORE_ADDR m68k_skip_prologue PARAMS ((CORE_ADDR ip)); |
c906108c SS |
39 | |
40 | /* Immediately after a function call, return the saved pc. | |
41 | Can't always go through the frames for this because on some machines | |
42 | the new frame is not set up until the new function executes | |
43 | some instructions. */ | |
44 | ||
45 | #ifdef __STDC__ | |
46 | struct frame_info; | |
47 | struct frame_saved_regs; | |
48 | #endif | |
49 | ||
50 | extern CORE_ADDR m68k_saved_pc_after_call PARAMS ((struct frame_info *)); | |
51 | extern void m68k_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *)); | |
52 | ||
53 | #define SAVED_PC_AFTER_CALL(frame) \ | |
54 | m68k_saved_pc_after_call(frame) | |
55 | ||
56 | /* Stack grows downward. */ | |
57 | ||
58 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
59 | ||
60 | /* Stack must be kept short aligned when doing function calls. */ | |
61 | ||
62 | #define STACK_ALIGN(ADDR) (((ADDR) + 1) & ~1) | |
63 | ||
64 | /* Sequence of bytes for breakpoint instruction. | |
65 | This is a TRAP instruction. The last 4 bits (0xf below) is the | |
66 | vector. Systems which don't use 0xf should define BPT_VECTOR | |
67 | themselves before including this file. */ | |
68 | ||
69 | #if !defined (BPT_VECTOR) | |
70 | #define BPT_VECTOR 0xf | |
71 | #endif | |
72 | ||
73 | #if !defined (BREAKPOINT) | |
74 | #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} | |
75 | #endif | |
76 | ||
77 | /* We default to vector 1 for the "remote" target, but allow targets | |
78 | to override. */ | |
79 | #if !defined (REMOTE_BPT_VECTOR) | |
80 | #define REMOTE_BPT_VECTOR 1 | |
81 | #endif | |
82 | ||
83 | #if !defined (REMOTE_BREAKPOINT) | |
84 | #define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)} | |
85 | #endif | |
86 | ||
87 | /* If your kernel resets the pc after the trap happens you may need to | |
88 | define this before including this file. */ | |
89 | ||
90 | #if !defined (DECR_PC_AFTER_BREAK) | |
91 | #define DECR_PC_AFTER_BREAK 2 | |
92 | #endif | |
93 | ||
94 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
95 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
96 | real way to know how big a register is. */ | |
97 | ||
98 | #define REGISTER_SIZE 4 | |
99 | ||
100 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) | |
101 | #define REGISTER_BYTES_NOFP (16*4 + 8) | |
102 | ||
103 | #ifndef NUM_REGS | |
104 | #define NUM_REGS 29 | |
105 | #endif | |
106 | ||
107 | #define NUM_FREGS (NUM_REGS-24) | |
108 | ||
109 | #ifndef REGISTER_BYTES_OK | |
110 | #define REGISTER_BYTES_OK(b) \ | |
111 | ((b) == REGISTER_BYTES_FP \ | |
112 | || (b) == REGISTER_BYTES_NOFP) | |
113 | #endif | |
114 | ||
115 | #ifndef REGISTER_BYTES | |
116 | #define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4) | |
117 | #endif | |
118 | ||
119 | /* Index within `registers' of the first byte of the space for | |
120 | register N. */ | |
121 | ||
122 | #define REGISTER_BYTE(N) \ | |
123 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \ | |
124 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \ | |
125 | : (N) * 4) | |
126 | ||
127 | /* Number of bytes of storage in the actual machine representation | |
128 | for register N. On the 68000, all regs are 4 bytes | |
129 | except the floating point regs which are 12 bytes. */ | |
130 | /* Note that the unsigned cast here forces the result of the | |
131 | subtraction to very high positive values if N < FP0_REGNUM */ | |
132 | ||
133 | #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4) | |
134 | ||
135 | /* Number of bytes of storage in the program's representation | |
136 | for register N. On the 68000, all regs are 4 bytes | |
137 | except the floating point regs which are 8-byte doubles. */ | |
138 | ||
139 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4) | |
140 | ||
141 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
142 | ||
143 | #define MAX_REGISTER_RAW_SIZE 12 | |
144 | ||
145 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
146 | ||
147 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
148 | ||
149 | /* Nonzero if register N requires conversion | |
150 | from raw format to virtual format. */ | |
151 | ||
152 | #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8) | |
153 | ||
154 | #include "floatformat.h" | |
155 | ||
156 | /* Convert data from raw format for register REGNUM in buffer FROM | |
157 | to virtual format with type TYPE in buffer TO. */ | |
158 | ||
159 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \ | |
160 | do \ | |
161 | { \ | |
162 | DOUBLEST dbl_tmp_val; \ | |
163 | floatformat_to_doublest (&floatformat_m68881_ext, (FROM), &dbl_tmp_val); \ | |
164 | store_floating ((TO), TYPE_LENGTH (TYPE), dbl_tmp_val); \ | |
165 | } while (0) | |
166 | ||
167 | /* Convert data from virtual format with type TYPE in buffer FROM | |
168 | to raw format for register REGNUM in buffer TO. */ | |
169 | ||
170 | #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \ | |
171 | do \ | |
172 | { \ | |
173 | DOUBLEST dbl_tmp_val; \ | |
174 | dbl_tmp_val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \ | |
175 | floatformat_from_doublest (&floatformat_m68881_ext, &dbl_tmp_val, (TO)); \ | |
176 | } while (0) | |
177 | ||
178 | /* Return the GDB type object for the "standard" data type of data | |
179 | in register N. This should be int for D0-D7, double for FP0-FP7, | |
180 | and void pointer for all others (A0-A7, PC, SR, FPCONTROL etc). | |
181 | Note, for registers which contain addresses return pointer to void, | |
182 | not pointer to char, because we don't want to attempt to print | |
183 | the string after printing the address. */ | |
184 | ||
185 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
186 | ((unsigned) (N) >= FPC_REGNUM ? lookup_pointer_type (builtin_type_void) : \ | |
187 | (unsigned) (N) >= FP0_REGNUM ? builtin_type_double : \ | |
188 | (unsigned) (N) >= A0_REGNUM ? lookup_pointer_type (builtin_type_void) : \ | |
189 | builtin_type_int) | |
190 | ||
191 | /* Initializer for an array of names of registers. | |
192 | Entries beyond the first NUM_REGS are ignored. */ | |
193 | ||
194 | #define REGISTER_NAMES \ | |
195 | {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \ | |
196 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \ | |
197 | "ps", "pc", \ | |
198 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \ | |
199 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" } | |
200 | ||
201 | /* Register numbers of various important registers. | |
202 | Note that some of these values are "real" register numbers, | |
203 | and correspond to the general registers of the machine, | |
204 | and some are "phony" register numbers which are too large | |
205 | to be actual register numbers as far as the user is concerned | |
206 | but do serve to get the desired values when passed to read_register. */ | |
207 | ||
208 | #define D0_REGNUM 0 | |
209 | #define A0_REGNUM 8 | |
210 | #define A1_REGNUM 9 | |
211 | #define FP_REGNUM 14 /* Contains address of executing stack frame */ | |
212 | #define SP_REGNUM 15 /* Contains address of top of stack */ | |
213 | #define PS_REGNUM 16 /* Contains processor status */ | |
214 | #define PC_REGNUM 17 /* Contains program counter */ | |
215 | #define FP0_REGNUM 18 /* Floating point register 0 */ | |
216 | #define FPC_REGNUM 26 /* 68881 control register */ | |
217 | #define FPS_REGNUM 27 /* 68881 status register */ | |
218 | #define FPI_REGNUM 28 /* 68881 iaddr register */ | |
219 | ||
220 | /* Store the address of the place in which to copy the structure the | |
221 | subroutine will return. This is called from call_function. */ | |
222 | ||
223 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
224 | { write_register (A1_REGNUM, (ADDR)); } | |
225 | ||
226 | /* Extract from an array REGBUF containing the (raw) register state | |
227 | a function return value of type TYPE, and copy that, in virtual format, | |
228 | into VALBUF. This is assuming that floating point values are returned | |
229 | as doubles in d0/d1. */ | |
230 | ||
231 | #if !defined (EXTRACT_RETURN_VALUE) | |
232 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
233 | memcpy ((VALBUF), \ | |
234 | (char *)(REGBUF) + \ | |
235 | (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \ | |
236 | TYPE_LENGTH(TYPE)) | |
237 | #endif | |
238 | ||
239 | /* Write into appropriate registers a function return value | |
240 | of type TYPE, given in virtual format. Assumes floats are passed | |
241 | in d0/d1. */ | |
242 | ||
243 | #if !defined (STORE_RETURN_VALUE) | |
244 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
245 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
246 | #endif | |
247 | ||
248 | /* Extract from an array REGBUF containing the (raw) register state | |
249 | the address in which a function should return its structure value, | |
250 | as a CORE_ADDR (or an expression that can be used as one). */ | |
251 | ||
252 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
253 | \f | |
254 | /* Describe the pointer in each stack frame to the previous stack frame | |
255 | (its caller). */ | |
256 | ||
257 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
258 | chain-pointer. | |
259 | In the case of the 68000, the frame's nominal address | |
260 | is the address of a 4-byte word containing the calling frame's address. */ | |
261 | ||
262 | /* If we are chaining from sigtramp, then manufacture a sigtramp frame | |
263 | (which isn't really on the stack. I'm not sure this is right for anything | |
264 | but BSD4.3 on an hp300. */ | |
265 | #define FRAME_CHAIN(thisframe) \ | |
266 | (thisframe->signal_handler_caller \ | |
267 | ? thisframe->frame \ | |
268 | : (!inside_entry_file ((thisframe)->pc) \ | |
269 | ? read_memory_integer ((thisframe)->frame, 4) \ | |
270 | : 0)) | |
271 | ||
272 | /* Define other aspects of the stack frame. */ | |
273 | ||
274 | /* A macro that tells us whether the function invocation represented | |
275 | by FI does not have a frame on the stack associated with it. If it | |
276 | does not, FRAMELESS is set to 1, else 0. */ | |
392a587b JM |
277 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
278 | (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue(FI)) | |
c906108c SS |
279 | |
280 | /* This was determined by experimentation on hp300 BSD 4.3. Perhaps | |
281 | it corresponds to some offset in /usr/include/sys/user.h or | |
282 | something like that. Using some system include file would | |
283 | have the advantage of probably being more robust in the face | |
284 | of OS upgrades, but the disadvantage of being wrong for | |
285 | cross-debugging. */ | |
286 | ||
287 | #define SIG_PC_FP_OFFSET 530 | |
288 | ||
289 | #define FRAME_SAVED_PC(FRAME) \ | |
290 | (((FRAME)->signal_handler_caller \ | |
291 | ? ((FRAME)->next \ | |
292 | ? read_memory_integer ((FRAME)->next->frame + SIG_PC_FP_OFFSET, 4) \ | |
293 | : read_memory_integer (read_register (SP_REGNUM) \ | |
294 | + SIG_PC_FP_OFFSET - 8, 4) \ | |
295 | ) \ | |
296 | : read_memory_integer ((FRAME)->frame + 4, 4)) \ | |
297 | ) | |
298 | ||
299 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
300 | ||
301 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
302 | ||
303 | /* Set VAL to the number of args passed to frame described by FI. | |
304 | Can set VAL to -1, meaning no way to tell. */ | |
305 | ||
306 | /* We can't tell how many args there are | |
307 | now that the C compiler delays popping them. */ | |
308 | #if !defined (FRAME_NUM_ARGS) | |
392a587b | 309 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
310 | #endif |
311 | ||
312 | /* Return number of bytes at start of arglist that are not really args. */ | |
313 | ||
314 | #define FRAME_ARGS_SKIP 8 | |
315 | ||
316 | /* Put here the code to store, into a struct frame_saved_regs, | |
317 | the addresses of the saved registers of frame described by FRAME_INFO. | |
318 | This includes special registers such as pc and fp saved in special | |
319 | ways in the stack frame. sp is even more special: | |
320 | the address we return for it IS the sp for the next frame. */ | |
321 | ||
322 | #if !defined (FRAME_FIND_SAVED_REGS) | |
323 | #define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr)) | |
324 | #endif /* no FIND_FRAME_SAVED_REGS. */ | |
325 | ||
326 | \f | |
327 | /* Things needed for making the inferior call functions. */ | |
328 | ||
329 | /* The CALL_DUMMY macro is the sequence of instructions, as disassembled | |
330 | by gdb itself: | |
331 | ||
332 | These instructions exist only so that m68k_find_saved_regs can parse | |
333 | them as a "prologue"; they are never executed. | |
334 | ||
335 | fmovemx fp0-fp7,sp@- 0xf227 0xe0ff | |
336 | moveml d0-a5,sp@- 0x48e7 0xfffc | |
337 | clrw sp@- 0x4267 | |
338 | movew ccr,sp@- 0x42e7 | |
339 | ||
340 | The arguments are pushed at this point by GDB; no code is needed in | |
341 | the dummy for this. The CALL_DUMMY_START_OFFSET gives the position | |
342 | of the following jsr instruction. That is where we start | |
343 | executing. | |
344 | ||
345 | jsr @#0x32323232 0x4eb9 0x3232 0x3232 | |
346 | addal #0x69696969,sp 0xdffc 0x6969 0x6969 | |
347 | trap #<your BPT_VECTOR number here> 0x4e4? | |
348 | nop 0x4e71 | |
349 | ||
350 | Note this is CALL_DUMMY_LENGTH bytes (28 for the above example). | |
351 | ||
352 | The dummy frame always saves the floating-point registers, whether they | |
353 | actually exist on this target or not. */ | |
354 | ||
355 | /* FIXME: Wrong to hardwire this as BPT_VECTOR when sometimes it | |
356 | should be REMOTE_BPT_VECTOR. Best way to fix it would be to define | |
357 | CALL_DUMMY_BREAKPOINT_OFFSET. */ | |
358 | ||
359 | #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))} | |
360 | #define CALL_DUMMY_LENGTH 28 /* Size of CALL_DUMMY */ | |
361 | #define CALL_DUMMY_START_OFFSET 12 /* Offset to jsr instruction*/ | |
362 | #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12) | |
363 | ||
364 | /* Insert the specified number of args and function address | |
365 | into a call sequence of the above form stored at DUMMYNAME. | |
366 | We use the BFD routines to store a big-endian value of known size. */ | |
367 | ||
368 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
369 | { bfd_putb32 (fun, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \ | |
370 | bfd_putb32 (nargs*4, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 8); } | |
371 | ||
372 | /* Push an empty stack frame, to record the current PC, etc. */ | |
373 | ||
374 | #define PUSH_DUMMY_FRAME { m68k_push_dummy_frame (); } | |
375 | ||
376 | extern void m68k_push_dummy_frame PARAMS ((void)); | |
377 | ||
378 | extern void m68k_pop_frame PARAMS ((void)); | |
379 | ||
380 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
381 | ||
382 | #define POP_FRAME { m68k_pop_frame (); } | |
383 | ||
384 | /* Offset from SP to first arg on stack at first instruction of a function */ | |
385 | ||
386 | #define SP_ARG0 (1 * 4) | |
387 | ||
388 | #define TARGET_M68K |