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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 | ||
f46ffb9e | 20 | /* Generic 68000 stuff, to be included by other tm-*.h files. */ |
5076de82 | 21 | |
5076de82 | 22 | #define IEEE_FLOAT 1 |
5076de82 FF |
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) | |
36 | #define SKIP_PROLOGUE(ip) {(ip) = m68k_skip_prologue(ip);} | |
37 | extern CORE_ADDR m68k_skip_prologue PARAMS ((CORE_ADDR ip)); | |
38 | #endif | |
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 | ||
9a13e99e SG |
45 | #ifdef __STDC__ |
46 | struct frame_info; | |
47 | #endif | |
48 | ||
49 | extern CORE_ADDR m68k_saved_pc_after_call PARAMS ((struct frame_info *)); | |
50 | ||
5076de82 | 51 | #define SAVED_PC_AFTER_CALL(frame) \ |
9a13e99e | 52 | m68k_saved_pc_after_call(frame) |
5076de82 FF |
53 | |
54 | /* Stack grows downward. */ | |
55 | ||
56 | #define INNER_THAN < | |
57 | ||
58 | /* Sequence of bytes for breakpoint instruction. | |
59 | This is a TRAP instruction. The last 4 bits (0xf below) is the | |
60 | vector. Systems which don't use 0xf should define BPT_VECTOR | |
61 | themselves before including this file. */ | |
62 | ||
63 | #if !defined (BPT_VECTOR) | |
64 | #define BPT_VECTOR 0xf | |
65 | #endif | |
66 | ||
67 | #if !defined (BREAKPOINT) | |
68 | #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} | |
69 | #endif | |
70 | ||
27405a28 JL |
71 | /* We default to vector 1 for the "remote" target, but allow targets |
72 | to override. */ | |
73 | #if !defined (REMOTE_BPT_VECTOR) | |
5af4f5f6 | 74 | #define REMOTE_BPT_VECTOR 1 |
27405a28 JL |
75 | #endif |
76 | ||
77 | #if !defined (REMOTE_BREAKPOINT) | |
5af4f5f6 | 78 | #define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)} |
27405a28 | 79 | #endif |
5af4f5f6 | 80 | |
5076de82 FF |
81 | /* If your kernel resets the pc after the trap happens you may need to |
82 | define this before including this file. */ | |
83 | ||
84 | #if !defined (DECR_PC_AFTER_BREAK) | |
85 | #define DECR_PC_AFTER_BREAK 2 | |
86 | #endif | |
87 | ||
88 | /* Nonzero if instruction at PC is a return instruction. */ | |
89 | /* Allow any of the return instructions, including a trapv and a return | |
90 | from interupt. */ | |
91 | ||
92 | #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74) | |
93 | ||
94 | /* Return 1 if P points to an invalid floating point value. */ | |
95 | ||
96 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ | |
97 | ||
f4f0d174 JK |
98 | /* Say how long (ordinary) registers are. This is a piece of bogosity |
99 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
100 | real way to know how big a register is. */ | |
5076de82 | 101 | |
f4f0d174 | 102 | #define REGISTER_SIZE 4 |
5076de82 | 103 | |
f46ffb9e JK |
104 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
105 | #define REGISTER_BYTES_NOFP (16*4 + 8) | |
106 | ||
9a13e99e SG |
107 | #ifndef NUM_REGS |
108 | #define NUM_REGS 29 | |
109 | #endif | |
110 | ||
111 | #ifndef REGISTER_BYTES_OK | |
112 | #define REGISTER_BYTES_OK(b) \ | |
113 | ((b) == REGISTER_BYTES_FP \ | |
114 | || (b) == REGISTER_BYTES_NOFP) | |
115 | #endif | |
116 | ||
117 | #ifndef REGISTER_BYTES | |
118 | #define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4) | |
119 | #endif | |
5076de82 FF |
120 | |
121 | /* Index within `registers' of the first byte of the space for | |
122 | register N. */ | |
123 | ||
5076de82 FF |
124 | #define REGISTER_BYTE(N) \ |
125 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \ | |
126 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \ | |
127 | : (N) * 4) | |
128 | ||
129 | /* Number of bytes of storage in the actual machine representation | |
130 | for register N. On the 68000, all regs are 4 bytes | |
131 | except the floating point regs which are 12 bytes. */ | |
132 | /* Note that the unsigned cast here forces the result of the | |
133 | subtraction to very high positive values if N < FP0_REGNUM */ | |
134 | ||
135 | #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4) | |
136 | ||
137 | /* Number of bytes of storage in the program's representation | |
138 | for register N. On the 68000, all regs are 4 bytes | |
139 | except the floating point regs which are 8-byte doubles. */ | |
140 | ||
141 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4) | |
142 | ||
143 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
144 | ||
145 | #define MAX_REGISTER_RAW_SIZE 12 | |
146 | ||
147 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
148 | ||
149 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
150 | ||
151 | /* Nonzero if register N requires conversion | |
152 | from raw format to virtual format. */ | |
153 | ||
154 | #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8) | |
155 | ||
156 | /* Put the declaration out here because if it's in the macros, PCC | |
157 | will complain. */ | |
158 | extern const struct ext_format ext_format_68881; | |
159 | ||
ad09cb2b PS |
160 | /* Convert data from raw format for register REGNUM in buffer FROM |
161 | to virtual format with type TYPE in buffer TO. */ | |
5076de82 | 162 | |
ad09cb2b | 163 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \ |
5076de82 | 164 | { \ |
bf5c0d64 | 165 | double val; \ |
ad09cb2b PS |
166 | ieee_extended_to_double (&ext_format_68881, (FROM), &val); \ |
167 | store_floating ((TO), TYPE_LENGTH (TYPE), val); \ | |
5076de82 FF |
168 | } |
169 | ||
ad09cb2b PS |
170 | /* Convert data from virtual format with type TYPE in buffer FROM |
171 | to raw format for register REGNUM in buffer TO. */ | |
5076de82 | 172 | |
ad09cb2b | 173 | #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \ |
5076de82 | 174 | { \ |
ad09cb2b PS |
175 | double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \ |
176 | double_to_ieee_extended (&ext_format_68881, &val, (TO)); \ | |
5076de82 FF |
177 | } |
178 | ||
179 | /* Return the GDB type object for the "standard" data type | |
180 | of data in register N. */ | |
181 | /* Note, for registers which contain addresses return | |
182 | pointer to void, not pointer to char, because we don't | |
183 | want to attempt to print the string after printing the address. */ | |
184 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
185 | (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : \ | |
186 | (N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ? \ | |
187 | lookup_pointer_type (builtin_type_void) : builtin_type_int) | |
188 | ||
5076de82 FF |
189 | /* Initializer for an array of names of registers. |
190 | Entries beyond the first NUM_REGS are ignored. */ | |
191 | ||
192 | #define REGISTER_NAMES \ | |
193 | {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \ | |
194 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \ | |
195 | "ps", "pc", \ | |
196 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \ | |
197 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" } | |
198 | ||
199 | /* Register numbers of various important registers. | |
200 | Note that some of these values are "real" register numbers, | |
201 | and correspond to the general registers of the machine, | |
202 | and some are "phony" register numbers which are too large | |
203 | to be actual register numbers as far as the user is concerned | |
204 | but do serve to get the desired values when passed to read_register. */ | |
205 | ||
206 | #define A1_REGNUM 9 | |
207 | #define FP_REGNUM 14 /* Contains address of executing stack frame */ | |
208 | #define SP_REGNUM 15 /* Contains address of top of stack */ | |
209 | #define PS_REGNUM 16 /* Contains processor status */ | |
210 | #define PC_REGNUM 17 /* Contains program counter */ | |
5076de82 FF |
211 | #define FP0_REGNUM 18 /* Floating point register 0 */ |
212 | #define FPC_REGNUM 26 /* 68881 control register */ | |
213 | #define FPS_REGNUM 27 /* 68881 status register */ | |
214 | #define FPI_REGNUM 28 /* 68881 iaddr register */ | |
5076de82 FF |
215 | |
216 | /* Store the address of the place in which to copy the structure the | |
217 | subroutine will return. This is called from call_function. */ | |
218 | ||
219 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
220 | { write_register (A1_REGNUM, (ADDR)); } | |
221 | ||
222 | /* Extract from an array REGBUF containing the (raw) register state | |
223 | a function return value of type TYPE, and copy that, in virtual format, | |
224 | into VALBUF. This is assuming that floating point values are returned | |
225 | as doubles in d0/d1. */ | |
226 | ||
227 | #if !defined (EXTRACT_RETURN_VALUE) | |
228 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
229 | memcpy ((VALBUF), \ | |
230 | (char *)(REGBUF) + \ | |
231 | (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \ | |
232 | TYPE_LENGTH(TYPE)) | |
233 | #endif | |
234 | ||
235 | /* Write into appropriate registers a function return value | |
236 | of type TYPE, given in virtual format. Assumes floats are passed | |
237 | in d0/d1. */ | |
238 | ||
239 | #if !defined (STORE_RETURN_VALUE) | |
240 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
241 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
242 | #endif | |
243 | ||
244 | /* Extract from an array REGBUF containing the (raw) register state | |
245 | the address in which a function should return its structure value, | |
246 | as a CORE_ADDR (or an expression that can be used as one). */ | |
247 | ||
248 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
249 | \f | |
250 | /* Describe the pointer in each stack frame to the previous stack frame | |
251 | (its caller). */ | |
252 | ||
253 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
254 | chain-pointer. | |
255 | In the case of the 68000, the frame's nominal address | |
256 | is the address of a 4-byte word containing the calling frame's address. */ | |
257 | ||
993583e5 JK |
258 | /* If we are chaining from sigtramp, then manufacture a sigtramp frame |
259 | (which isn't really on the stack. I'm not sure this is right for anything | |
260 | but BSD4.3 on an hp300. */ | |
5076de82 | 261 | #define FRAME_CHAIN(thisframe) \ |
993583e5 JK |
262 | (thisframe->signal_handler_caller \ |
263 | ? thisframe->frame \ | |
80ddbedc RP |
264 | : (!inside_entry_file ((thisframe)->pc) \ |
265 | ? read_memory_integer ((thisframe)->frame, 4) \ | |
266 | : 0)) | |
5076de82 FF |
267 | |
268 | /* Define other aspects of the stack frame. */ | |
269 | ||
270 | /* A macro that tells us whether the function invocation represented | |
271 | by FI does not have a frame on the stack associated with it. If it | |
272 | does not, FRAMELESS is set to 1, else 0. */ | |
273 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
993583e5 JK |
274 | do { \ |
275 | if ((FI)->signal_handler_caller) \ | |
276 | (FRAMELESS) = 0; \ | |
277 | else \ | |
278 | (FRAMELESS) = frameless_look_for_prologue(FI); \ | |
279 | } while (0) | |
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 | ) | |
5076de82 FF |
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(val,fi) (val = -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) | |
e7ac0161 | 324 | #define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr)) |
5076de82 FF |
325 | #endif /* no FIND_FRAME_SAVED_REGS. */ |
326 | ||
327 | \f | |
ea2455a9 | 328 | /* Things needed for making the inferior call functions. */ |
5076de82 FF |
329 | |
330 | /* The CALL_DUMMY macro is the sequence of instructions, as disassembled | |
331 | by gdb itself: | |
332 | ||
f46ffb9e JK |
333 | These instructions exist only so that m68k_find_saved_regs can parse |
334 | them as a "prologue"; they are never executed. | |
335 | ||
5076de82 FF |
336 | fmovemx fp0-fp7,sp@- 0xf227 0xe0ff |
337 | moveml d0-a5,sp@- 0x48e7 0xfffc | |
338 | clrw sp@- 0x4267 | |
339 | movew ccr,sp@- 0x42e7 | |
340 | ||
f46ffb9e JK |
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. | |
5076de82 FF |
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). | |
5076de82 | 352 | |
f46ffb9e JK |
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 | |
56756a5a JK |
357 | should be REMOTE_BPT_VECTOR. Best way to fix it would be to define |
358 | CALL_DUMMY_BREAKPOINT_OFFSET. */ | |
5076de82 FF |
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*/ | |
f0d2557c | 363 | #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12) |
5076de82 | 364 | |
5076de82 FF |
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) \ | |
9a13e99e SG |
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); } | |
5076de82 FF |
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) |