Commit | Line | Data |
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c906108c | 1 | /* Target dependent code for the Motorola 68000 series. |
a1de33a8 PDM |
2 | Copyright (C) 1990, 1992, 1993, 1994, 1995, 1996, 1999, 2000 |
3 | 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 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "symtab.h" | |
25 | #include "gdbcore.h" | |
26 | #include "value.h" | |
27 | #include "gdb_string.h" | |
7a292a7a | 28 | #include "inferior.h" |
c906108c | 29 | \f |
c5aa993b | 30 | |
89c3b6d3 PDM |
31 | #define P_LINKL_FP 0x480e |
32 | #define P_LINKW_FP 0x4e56 | |
33 | #define P_PEA_FP 0x4856 | |
34 | #define P_MOVL_SP_FP 0x2c4f | |
35 | #define P_MOVL 0x207c | |
36 | #define P_JSR 0x4eb9 | |
37 | #define P_BSR 0x61ff | |
38 | #define P_LEAL 0x43fb | |
39 | #define P_MOVML 0x48ef | |
40 | #define P_FMOVM 0xf237 | |
41 | #define P_TRAP 0x4e40 | |
42 | ||
b83266a0 SS |
43 | /* The only reason this is here is the tm-altos.h reference below. It |
44 | was moved back here from tm-m68k.h. FIXME? */ | |
45 | ||
46 | extern CORE_ADDR | |
47 | altos_skip_prologue (pc) | |
48 | CORE_ADDR pc; | |
49 | { | |
50 | register int op = read_memory_integer (pc, 2); | |
89c3b6d3 | 51 | if (op == P_LINKW_FP) |
c5aa993b | 52 | pc += 4; /* Skip link #word */ |
89c3b6d3 | 53 | else if (op == P_LINKL_FP) |
c5aa993b | 54 | pc += 6; /* Skip link #long */ |
b83266a0 SS |
55 | /* Not sure why branches are here. */ |
56 | /* From tm-isi.h, tm-altos.h */ | |
57 | else if (op == 0060000) | |
c5aa993b | 58 | pc += 4; /* Skip bra #word */ |
b83266a0 | 59 | else if (op == 00600377) |
c5aa993b | 60 | pc += 6; /* skip bra #long */ |
b83266a0 | 61 | else if ((op & 0177400) == 0060000) |
c5aa993b | 62 | pc += 2; /* skip bra #char */ |
b83266a0 SS |
63 | return pc; |
64 | } | |
65 | ||
66 | /* The only reason this is here is the tm-isi.h reference below. It | |
67 | was moved back here from tm-m68k.h. FIXME? */ | |
68 | ||
69 | extern CORE_ADDR | |
70 | isi_skip_prologue (pc) | |
71 | CORE_ADDR pc; | |
72 | { | |
73 | register int op = read_memory_integer (pc, 2); | |
89c3b6d3 | 74 | if (op == P_LINKW_FP) |
c5aa993b | 75 | pc += 4; /* Skip link #word */ |
89c3b6d3 | 76 | else if (op == P_LINKL_FP) |
c5aa993b | 77 | pc += 6; /* Skip link #long */ |
b83266a0 SS |
78 | /* Not sure why branches are here. */ |
79 | /* From tm-isi.h, tm-altos.h */ | |
80 | else if (op == 0060000) | |
c5aa993b | 81 | pc += 4; /* Skip bra #word */ |
b83266a0 | 82 | else if (op == 00600377) |
c5aa993b | 83 | pc += 6; /* skip bra #long */ |
b83266a0 | 84 | else if ((op & 0177400) == 0060000) |
c5aa993b | 85 | pc += 2; /* skip bra #char */ |
b83266a0 SS |
86 | return pc; |
87 | } | |
88 | ||
89c3b6d3 PDM |
89 | int |
90 | delta68_in_sigtramp (pc, name) | |
91 | CORE_ADDR pc; | |
92 | char *name; | |
93 | { | |
1bd54964 AC |
94 | if (name != NULL) |
95 | return strcmp (name, "_sigcode") == 0; | |
96 | else | |
97 | return 0; | |
89c3b6d3 PDM |
98 | } |
99 | ||
100 | CORE_ADDR | |
101 | delta68_frame_args_address (frame_info) | |
102 | struct frame_info * frame_info; | |
103 | { | |
104 | /* we assume here that the only frameless functions are the system calls | |
105 | or other functions who do not put anything on the stack. */ | |
106 | if (frame_info->signal_handler_caller) | |
107 | return frame_info->frame + 12; | |
108 | else if (frameless_look_for_prologue (frame_info)) | |
109 | { | |
110 | /* Check for an interrupted system call */ | |
111 | if (frame_info->next && frame_info->next->signal_handler_caller) | |
112 | return frame_info->next->frame + 16; | |
113 | else | |
114 | return frame_info->frame + 4; | |
115 | } | |
116 | else | |
117 | return frame_info->frame; | |
118 | } | |
119 | ||
120 | CORE_ADDR | |
121 | delta68_frame_saved_pc (frame_info) | |
122 | struct frame_info * frame_info; | |
123 | { | |
124 | return read_memory_integer (delta68_frame_args_address (frame_info) + 4, 4); | |
125 | } | |
126 | ||
392a587b JM |
127 | /* Return number of args passed to a frame. |
128 | Can return -1, meaning no way to tell. */ | |
129 | ||
130 | int | |
131 | isi_frame_num_args (fi) | |
132 | struct frame_info *fi; | |
133 | { | |
134 | int val; | |
135 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
136 | int insn = 0177777 & read_memory_integer (pc, 2); | |
137 | val = 0; | |
c5aa993b | 138 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 139 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
140 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
141 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
142 | { |
143 | val = (insn >> 9) & 7; | |
144 | if (val == 0) | |
145 | val = 8; | |
146 | } | |
c5aa993b | 147 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
148 | val = read_memory_integer (pc + 2, 4); |
149 | val >>= 2; | |
150 | return val; | |
151 | } | |
152 | ||
153 | int | |
154 | delta68_frame_num_args (fi) | |
155 | struct frame_info *fi; | |
156 | { | |
157 | int val; | |
158 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
159 | int insn = 0177777 & read_memory_integer (pc, 2); | |
160 | val = 0; | |
c5aa993b | 161 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 162 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
163 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
164 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
165 | { |
166 | val = (insn >> 9) & 7; | |
167 | if (val == 0) | |
168 | val = 8; | |
169 | } | |
c5aa993b | 170 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
171 | val = read_memory_integer (pc + 2, 4); |
172 | val >>= 2; | |
173 | return val; | |
174 | } | |
175 | ||
176 | int | |
177 | news_frame_num_args (fi) | |
178 | struct frame_info *fi; | |
179 | { | |
180 | int val; | |
181 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
182 | int insn = 0177777 & read_memory_integer (pc, 2); | |
183 | val = 0; | |
c5aa993b | 184 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 185 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
186 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
187 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
188 | { |
189 | val = (insn >> 9) & 7; | |
190 | if (val == 0) | |
191 | val = 8; | |
192 | } | |
c5aa993b | 193 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
194 | val = read_memory_integer (pc + 2, 4); |
195 | val >>= 2; | |
196 | return val; | |
197 | } | |
b83266a0 | 198 | |
c906108c SS |
199 | /* Push an empty stack frame, to record the current PC, etc. */ |
200 | ||
201 | void | |
202 | m68k_push_dummy_frame () | |
203 | { | |
204 | register CORE_ADDR sp = read_register (SP_REGNUM); | |
205 | register int regnum; | |
206 | char raw_buffer[12]; | |
207 | ||
208 | sp = push_word (sp, read_register (PC_REGNUM)); | |
209 | sp = push_word (sp, read_register (FP_REGNUM)); | |
210 | write_register (FP_REGNUM, sp); | |
211 | ||
212 | /* Always save the floating-point registers, whether they exist on | |
213 | this target or not. */ | |
214 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) | |
215 | { | |
216 | read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); | |
217 | sp = push_bytes (sp, raw_buffer, 12); | |
218 | } | |
219 | ||
220 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) | |
221 | { | |
222 | sp = push_word (sp, read_register (regnum)); | |
223 | } | |
224 | sp = push_word (sp, read_register (PS_REGNUM)); | |
225 | write_register (SP_REGNUM, sp); | |
226 | } | |
227 | ||
228 | /* Discard from the stack the innermost frame, | |
229 | restoring all saved registers. */ | |
230 | ||
231 | void | |
232 | m68k_pop_frame () | |
233 | { | |
234 | register struct frame_info *frame = get_current_frame (); | |
235 | register CORE_ADDR fp; | |
236 | register int regnum; | |
237 | struct frame_saved_regs fsr; | |
238 | char raw_buffer[12]; | |
239 | ||
240 | fp = FRAME_FP (frame); | |
241 | get_frame_saved_regs (frame, &fsr); | |
c5aa993b | 242 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) |
c906108c SS |
243 | { |
244 | if (fsr.regs[regnum]) | |
245 | { | |
246 | read_memory (fsr.regs[regnum], raw_buffer, 12); | |
247 | write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); | |
248 | } | |
249 | } | |
c5aa993b | 250 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) |
c906108c SS |
251 | { |
252 | if (fsr.regs[regnum]) | |
253 | { | |
254 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); | |
255 | } | |
256 | } | |
257 | if (fsr.regs[PS_REGNUM]) | |
258 | { | |
259 | write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); | |
260 | } | |
261 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
262 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
263 | write_register (SP_REGNUM, fp + 8); | |
264 | flush_cached_frames (); | |
265 | } | |
c906108c | 266 | \f |
c5aa993b | 267 | |
c906108c SS |
268 | /* Given an ip value corresponding to the start of a function, |
269 | return the ip of the first instruction after the function | |
270 | prologue. This is the generic m68k support. Machines which | |
271 | require something different can override the SKIP_PROLOGUE | |
272 | macro to point elsewhere. | |
273 | ||
274 | Some instructions which typically may appear in a function | |
275 | prologue include: | |
276 | ||
277 | A link instruction, word form: | |
278 | ||
c5aa993b | 279 | link.w %a6,&0 4e56 XXXX |
c906108c SS |
280 | |
281 | A link instruction, long form: | |
282 | ||
c5aa993b | 283 | link.l %fp,&F%1 480e XXXX XXXX |
c906108c SS |
284 | |
285 | A movm instruction to preserve integer regs: | |
286 | ||
c5aa993b | 287 | movm.l &M%1,(4,%sp) 48ef XXXX XXXX |
c906108c SS |
288 | |
289 | A fmovm instruction to preserve float regs: | |
290 | ||
c5aa993b | 291 | fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX |
c906108c SS |
292 | |
293 | Some profiling setup code (FIXME, not recognized yet): | |
294 | ||
c5aa993b JM |
295 | lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX |
296 | bsr _mcount 61ff XXXX XXXX | |
c906108c | 297 | |
c5aa993b | 298 | */ |
c906108c | 299 | |
c906108c SS |
300 | CORE_ADDR |
301 | m68k_skip_prologue (ip) | |
c5aa993b | 302 | CORE_ADDR ip; |
c906108c SS |
303 | { |
304 | register CORE_ADDR limit; | |
305 | struct symtab_and_line sal; | |
306 | register int op; | |
307 | ||
308 | /* Find out if there is a known limit for the extent of the prologue. | |
309 | If so, ensure we don't go past it. If not, assume "infinity". */ | |
310 | ||
311 | sal = find_pc_line (ip, 0); | |
c5aa993b | 312 | limit = (sal.end) ? sal.end : (CORE_ADDR) ~ 0; |
c906108c SS |
313 | |
314 | while (ip < limit) | |
315 | { | |
316 | op = read_memory_integer (ip, 2); | |
317 | op &= 0xFFFF; | |
c5aa993b | 318 | |
89c3b6d3 PDM |
319 | if (op == P_LINKW_FP) |
320 | ip += 4; /* Skip link.w */ | |
321 | else if (op == P_PEA_FP) | |
c5aa993b | 322 | ip += 2; /* Skip pea %fp */ |
89c3b6d3 | 323 | else if (op == P_MOVL_SP_FP) |
c5aa993b | 324 | ip += 2; /* Skip move.l %sp, %fp */ |
89c3b6d3 PDM |
325 | else if (op == P_LINKL_FP) |
326 | ip += 6; /* Skip link.l */ | |
327 | else if (op == P_MOVML) | |
328 | ip += 6; /* Skip movm.l */ | |
c906108c | 329 | else if (op == P_FMOVM) |
89c3b6d3 | 330 | ip += 10; /* Skip fmovm */ |
c906108c | 331 | else |
89c3b6d3 | 332 | break; /* Found unknown code, bail out. */ |
c906108c SS |
333 | } |
334 | return (ip); | |
335 | } | |
336 | ||
337 | void | |
338 | m68k_find_saved_regs (frame_info, saved_regs) | |
339 | struct frame_info *frame_info; | |
340 | struct frame_saved_regs *saved_regs; | |
341 | { | |
c5aa993b JM |
342 | register int regnum; |
343 | register int regmask; | |
344 | register CORE_ADDR next_addr; | |
c906108c SS |
345 | register CORE_ADDR pc; |
346 | ||
347 | /* First possible address for a pc in a call dummy for this frame. */ | |
348 | CORE_ADDR possible_call_dummy_start = | |
c5aa993b | 349 | (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 - 8 * 12; |
c906108c SS |
350 | |
351 | int nextinsn; | |
352 | memset (saved_regs, 0, sizeof (*saved_regs)); | |
353 | if ((frame_info)->pc >= possible_call_dummy_start | |
354 | && (frame_info)->pc <= (frame_info)->frame) | |
355 | { | |
356 | ||
357 | /* It is a call dummy. We could just stop now, since we know | |
c5aa993b JM |
358 | what the call dummy saves and where. But this code proceeds |
359 | to parse the "prologue" which is part of the call dummy. | |
360 | This is needlessly complex and confusing. FIXME. */ | |
c906108c SS |
361 | |
362 | next_addr = (frame_info)->frame; | |
363 | pc = possible_call_dummy_start; | |
364 | } | |
c5aa993b | 365 | else |
c906108c | 366 | { |
c5aa993b | 367 | pc = get_pc_function_start ((frame_info)->pc); |
c906108c | 368 | |
89c3b6d3 PDM |
369 | nextinsn = read_memory_integer (pc, 2); |
370 | if (P_PEA_FP == nextinsn | |
371 | && P_MOVL_SP_FP == read_memory_integer (pc + 2, 2)) | |
c906108c | 372 | { |
89c3b6d3 | 373 | /* pea %fp |
c5aa993b | 374 | move.l %sp, %fp */ |
c906108c | 375 | next_addr = frame_info->frame; |
89c3b6d3 | 376 | pc += 4; |
c906108c | 377 | } |
89c3b6d3 | 378 | else if (P_LINKL_FP == nextinsn) |
c906108c SS |
379 | /* link.l %fp */ |
380 | /* Find the address above the saved | |
381 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 PDM |
382 | { |
383 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 4); | |
384 | pc += 6; | |
385 | } | |
386 | else if (P_LINKW_FP == nextinsn) | |
c906108c SS |
387 | /* link.w %fp */ |
388 | /* Find the address above the saved | |
389 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 PDM |
390 | { |
391 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 2); | |
392 | pc += 4; | |
393 | } | |
c5aa993b JM |
394 | else |
395 | goto lose; | |
396 | ||
397 | /* If have an addal #-n, sp next, adjust next_addr. */ | |
398 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) | |
399 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; | |
400 | } | |
c5aa993b | 401 | |
89c3b6d3 | 402 | for ( ; ; ) |
c5aa993b | 403 | { |
89c3b6d3 | 404 | nextinsn = 0xffff & read_memory_integer (pc, 2); |
c5aa993b | 405 | regmask = read_memory_integer (pc + 2, 2); |
89c3b6d3 PDM |
406 | /* fmovemx to -(sp) */ |
407 | if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000) | |
c906108c | 408 | { |
89c3b6d3 PDM |
409 | /* Regmask's low bit is for register fp7, the first pushed */ |
410 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
411 | if (regmask & 1) | |
412 | saved_regs->regs[regnum] = (next_addr -= 12); | |
413 | pc += 4; | |
414 | } | |
415 | /* fmovemx to (fp + displacement) */ | |
416 | else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000) | |
417 | { | |
418 | register CORE_ADDR addr; | |
419 | ||
420 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); | |
421 | /* Regmask's low bit is for register fp7, the first pushed */ | |
422 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
423 | if (regmask & 1) | |
424 | { | |
425 | saved_regs->regs[regnum] = addr; | |
426 | addr += 12; | |
427 | } | |
428 | pc += 6; | |
429 | } | |
430 | /* moveml to (sp) */ | |
431 | else if (0044327 == nextinsn) | |
432 | { | |
433 | /* Regmask's low bit is for register 0, the first written */ | |
434 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
435 | if (regmask & 1) | |
436 | { | |
437 | saved_regs->regs[regnum] = next_addr; | |
438 | next_addr += 4; | |
439 | } | |
440 | pc += 4; | |
441 | } | |
442 | /* moveml to (fp + displacement) */ | |
443 | else if (0044356 == nextinsn) | |
444 | { | |
445 | register CORE_ADDR addr; | |
446 | ||
447 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); | |
448 | /* Regmask's low bit is for register 0, the first written */ | |
449 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
450 | if (regmask & 1) | |
451 | { | |
452 | saved_regs->regs[regnum] = addr; | |
453 | addr += 4; | |
454 | } | |
455 | pc += 6; | |
456 | } | |
457 | /* moveml to -(sp) */ | |
458 | else if (0044347 == nextinsn) | |
459 | { | |
460 | /* Regmask's low bit is for register 15, the first pushed */ | |
461 | for (regnum = 16; --regnum >= 0; regmask >>= 1) | |
462 | if (regmask & 1) | |
463 | saved_regs->regs[regnum] = (next_addr -= 4); | |
464 | pc += 4; | |
465 | } | |
466 | /* movl r,-(sp) */ | |
467 | else if (0x2f00 == (0xfff0 & nextinsn)) | |
468 | { | |
469 | regnum = 0xf & nextinsn; | |
c906108c | 470 | saved_regs->regs[regnum] = (next_addr -= 4); |
89c3b6d3 | 471 | pc += 2; |
c906108c | 472 | } |
89c3b6d3 PDM |
473 | /* fmovemx to index of sp */ |
474 | else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000) | |
475 | { | |
476 | /* Regmask's low bit is for register fp0, the first written */ | |
477 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
478 | if (regmask & 1) | |
479 | { | |
480 | saved_regs->regs[regnum] = next_addr; | |
481 | next_addr += 12; | |
482 | } | |
483 | pc += 10; | |
484 | } | |
485 | /* clrw -(sp); movw ccr,-(sp) */ | |
486 | else if (0x4267 == nextinsn && 0x42e7 == regmask) | |
487 | { | |
488 | saved_regs->regs[PS_REGNUM] = (next_addr -= 4); | |
489 | pc += 4; | |
490 | } | |
491 | else | |
492 | break; | |
c906108c | 493 | } |
c5aa993b JM |
494 | lose:; |
495 | saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8; | |
496 | saved_regs->regs[FP_REGNUM] = (frame_info)->frame; | |
497 | saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4; | |
c906108c SS |
498 | #ifdef SIG_SP_FP_OFFSET |
499 | /* Adjust saved SP_REGNUM for fake _sigtramp frames. */ | |
500 | if (frame_info->signal_handler_caller && frame_info->next) | |
501 | saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET; | |
502 | #endif | |
503 | } | |
504 | ||
505 | ||
c5aa993b | 506 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
507 | |
508 | #include <sys/procfs.h> | |
509 | ||
c60c0f5f MS |
510 | /* Prototypes for supply_gregset etc. */ |
511 | #include "gregset.h" | |
512 | ||
c906108c | 513 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
514 | two different sets, the general register set (gregset) and the floating |
515 | point register set (fpregset). For each set, there is an ioctl to get | |
516 | the current register set and another ioctl to set the current values. | |
c906108c | 517 | |
c5aa993b JM |
518 | The actual structure passed through the ioctl interface is, of course, |
519 | naturally machine dependent, and is different for each set of registers. | |
520 | For the m68k for example, the general register set is typically defined | |
521 | by: | |
c906108c | 522 | |
c5aa993b | 523 | typedef int gregset_t[18]; |
c906108c | 524 | |
c5aa993b JM |
525 | #define R_D0 0 |
526 | ... | |
527 | #define R_PS 17 | |
c906108c | 528 | |
c5aa993b | 529 | and the floating point set by: |
c906108c | 530 | |
c5aa993b JM |
531 | typedef struct fpregset { |
532 | int f_pcr; | |
533 | int f_psr; | |
534 | int f_fpiaddr; | |
535 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
536 | } fpregset_t; | |
c906108c | 537 | |
c5aa993b JM |
538 | These routines provide the packing and unpacking of gregset_t and |
539 | fpregset_t formatted data. | |
c906108c SS |
540 | |
541 | */ | |
542 | ||
543 | /* Atari SVR4 has R_SR but not R_PS */ | |
544 | ||
545 | #if !defined (R_PS) && defined (R_SR) | |
546 | #define R_PS R_SR | |
547 | #endif | |
548 | ||
549 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
550 | unpack the register contents and supply them as gdb's idea of the current |
551 | register values. */ | |
c906108c SS |
552 | |
553 | void | |
554 | supply_gregset (gregsetp) | |
c5aa993b | 555 | gregset_t *gregsetp; |
c906108c SS |
556 | { |
557 | register int regi; | |
558 | register greg_t *regp = (greg_t *) gregsetp; | |
559 | ||
c5aa993b | 560 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
561 | { |
562 | supply_register (regi, (char *) (regp + regi)); | |
563 | } | |
564 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
565 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
566 | } | |
567 | ||
568 | void | |
569 | fill_gregset (gregsetp, regno) | |
c5aa993b JM |
570 | gregset_t *gregsetp; |
571 | int regno; | |
c906108c SS |
572 | { |
573 | register int regi; | |
574 | register greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 575 | |
c5aa993b | 576 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
577 | { |
578 | if ((regno == -1) || (regno == regi)) | |
579 | { | |
580 | *(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)]; | |
581 | } | |
582 | } | |
583 | if ((regno == -1) || (regno == PS_REGNUM)) | |
584 | { | |
585 | *(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)]; | |
586 | } | |
587 | if ((regno == -1) || (regno == PC_REGNUM)) | |
588 | { | |
589 | *(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
590 | } | |
591 | } | |
592 | ||
593 | #if defined (FP0_REGNUM) | |
594 | ||
595 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
596 | (fpregset_t *), unpack the register contents and supply them as gdb's |
597 | idea of the current floating point register values. */ | |
c906108c | 598 | |
c5aa993b | 599 | void |
c906108c | 600 | supply_fpregset (fpregsetp) |
c5aa993b | 601 | fpregset_t *fpregsetp; |
c906108c SS |
602 | { |
603 | register int regi; | |
604 | char *from; | |
c5aa993b JM |
605 | |
606 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) | |
c906108c | 607 | { |
c5aa993b | 608 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
609 | supply_register (regi, from); |
610 | } | |
c5aa993b JM |
611 | supply_register (FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
612 | supply_register (FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
613 | supply_register (FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
614 | } |
615 | ||
616 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
617 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
618 | of the current floating point register set. If REGNO is -1, update | |
619 | them all. */ | |
c906108c SS |
620 | |
621 | void | |
622 | fill_fpregset (fpregsetp, regno) | |
c5aa993b JM |
623 | fpregset_t *fpregsetp; |
624 | int regno; | |
c906108c SS |
625 | { |
626 | int regi; | |
627 | char *to; | |
628 | char *from; | |
c906108c | 629 | |
c5aa993b | 630 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) |
c906108c SS |
631 | { |
632 | if ((regno == -1) || (regno == regi)) | |
633 | { | |
634 | from = (char *) ®isters[REGISTER_BYTE (regi)]; | |
c5aa993b | 635 | to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
636 | memcpy (to, from, REGISTER_RAW_SIZE (regi)); |
637 | } | |
638 | } | |
639 | if ((regno == -1) || (regno == FPC_REGNUM)) | |
640 | { | |
c5aa993b | 641 | fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)]; |
c906108c SS |
642 | } |
643 | if ((regno == -1) || (regno == FPS_REGNUM)) | |
644 | { | |
c5aa993b | 645 | fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)]; |
c906108c SS |
646 | } |
647 | if ((regno == -1) || (regno == FPI_REGNUM)) | |
648 | { | |
c5aa993b | 649 | fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)]; |
c906108c SS |
650 | } |
651 | } | |
652 | ||
c5aa993b | 653 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 654 | |
c5aa993b | 655 | #endif /* USE_PROC_FS */ |
c906108c SS |
656 | |
657 | #ifdef GET_LONGJMP_TARGET | |
658 | /* Figure out where the longjmp will land. Slurp the args out of the stack. | |
659 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
660 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
661 | This routine returns true on success. */ | |
662 | ||
663 | int | |
c5aa993b | 664 | get_longjmp_target (pc) |
c906108c SS |
665 | CORE_ADDR *pc; |
666 | { | |
667 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; | |
668 | CORE_ADDR sp, jb_addr; | |
669 | ||
c5aa993b | 670 | sp = read_register (SP_REGNUM); |
c906108c | 671 | |
c5aa993b | 672 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
c906108c SS |
673 | buf, |
674 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
675 | return 0; | |
676 | ||
677 | jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
678 | ||
679 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
680 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
681 | return 0; | |
682 | ||
683 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
684 | ||
685 | return 1; | |
686 | } | |
687 | #endif /* GET_LONGJMP_TARGET */ | |
688 | ||
689 | /* Immediately after a function call, return the saved pc before the frame | |
690 | is setup. For sun3's, we check for the common case of being inside of a | |
691 | system call, and if so, we know that Sun pushes the call # on the stack | |
692 | prior to doing the trap. */ | |
693 | ||
694 | CORE_ADDR | |
c5aa993b | 695 | m68k_saved_pc_after_call (frame) |
c906108c SS |
696 | struct frame_info *frame; |
697 | { | |
698 | #ifdef SYSCALL_TRAP | |
699 | int op; | |
700 | ||
701 | op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2); | |
702 | ||
703 | if (op == SYSCALL_TRAP) | |
704 | return read_memory_integer (read_register (SP_REGNUM) + 4, 4); | |
705 | else | |
706 | #endif /* SYSCALL_TRAP */ | |
707 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
708 | } | |
709 | ||
2acceee2 | 710 | |
c906108c SS |
711 | void |
712 | _initialize_m68k_tdep () | |
713 | { | |
714 | tm_print_insn = print_insn_m68k; | |
715 | } |