Commit | Line | Data |
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c906108c | 1 | /* Target dependent code for the Motorola 68000 series. |
b6ba6518 | 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001 |
a1de33a8 | 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" |
4e052eda | 29 | #include "regcache.h" |
c906108c | 30 | \f |
c5aa993b | 31 | |
89c3b6d3 PDM |
32 | #define P_LINKL_FP 0x480e |
33 | #define P_LINKW_FP 0x4e56 | |
34 | #define P_PEA_FP 0x4856 | |
35 | #define P_MOVL_SP_FP 0x2c4f | |
36 | #define P_MOVL 0x207c | |
37 | #define P_JSR 0x4eb9 | |
38 | #define P_BSR 0x61ff | |
39 | #define P_LEAL 0x43fb | |
40 | #define P_MOVML 0x48ef | |
41 | #define P_FMOVM 0xf237 | |
42 | #define P_TRAP 0x4e40 | |
43 | ||
b83266a0 SS |
44 | /* The only reason this is here is the tm-altos.h reference below. It |
45 | was moved back here from tm-m68k.h. FIXME? */ | |
46 | ||
47 | extern CORE_ADDR | |
fba45db2 | 48 | altos_skip_prologue (CORE_ADDR pc) |
b83266a0 SS |
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 | 55 | /* Not sure why branches are here. */ |
514e603d | 56 | /* From tm-altos.h */ |
b83266a0 | 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 | ||
514e603d AC |
69 | /* OBSOLETE extern CORE_ADDR */ |
70 | /* OBSOLETE isi_skip_prologue (CORE_ADDR pc) */ | |
71 | /* OBSOLETE { */ | |
72 | /* OBSOLETE register int op = read_memory_integer (pc, 2); */ | |
73 | /* OBSOLETE if (op == P_LINKW_FP) */ | |
74 | /* OBSOLETE pc += 4; *//* Skip link #word */ | |
75 | /* OBSOLETE else if (op == P_LINKL_FP) */ | |
76 | /* OBSOLETE pc += 6; *//* Skip link #long */ | |
77 | /* OBSOLETE *//* Not sure why branches are here. */ | |
78 | /* OBSOLETE *//* From tm-isi.h, tm-altos.h */ | |
79 | /* OBSOLETE else if (op == 0060000) */ | |
80 | /* OBSOLETE pc += 4; *//* Skip bra #word */ | |
81 | /* OBSOLETE else if (op == 00600377) */ | |
82 | /* OBSOLETE pc += 6; *//* skip bra #long */ | |
83 | /* OBSOLETE else if ((op & 0177400) == 0060000) */ | |
84 | /* OBSOLETE pc += 2; *//* skip bra #char */ | |
85 | /* OBSOLETE return pc; */ | |
86 | /* OBSOLETE } */ | |
b83266a0 | 87 | |
89c3b6d3 | 88 | int |
fba45db2 | 89 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
89c3b6d3 | 90 | { |
1bd54964 AC |
91 | if (name != NULL) |
92 | return strcmp (name, "_sigcode") == 0; | |
93 | else | |
94 | return 0; | |
89c3b6d3 PDM |
95 | } |
96 | ||
97 | CORE_ADDR | |
fba45db2 | 98 | delta68_frame_args_address (struct frame_info *frame_info) |
89c3b6d3 PDM |
99 | { |
100 | /* we assume here that the only frameless functions are the system calls | |
101 | or other functions who do not put anything on the stack. */ | |
102 | if (frame_info->signal_handler_caller) | |
103 | return frame_info->frame + 12; | |
104 | else if (frameless_look_for_prologue (frame_info)) | |
105 | { | |
106 | /* Check for an interrupted system call */ | |
107 | if (frame_info->next && frame_info->next->signal_handler_caller) | |
108 | return frame_info->next->frame + 16; | |
109 | else | |
110 | return frame_info->frame + 4; | |
111 | } | |
112 | else | |
113 | return frame_info->frame; | |
114 | } | |
115 | ||
116 | CORE_ADDR | |
fba45db2 | 117 | delta68_frame_saved_pc (struct frame_info *frame_info) |
89c3b6d3 PDM |
118 | { |
119 | return read_memory_integer (delta68_frame_args_address (frame_info) + 4, 4); | |
120 | } | |
121 | ||
392a587b JM |
122 | /* Return number of args passed to a frame. |
123 | Can return -1, meaning no way to tell. */ | |
124 | ||
125 | int | |
fba45db2 | 126 | isi_frame_num_args (struct frame_info *fi) |
392a587b JM |
127 | { |
128 | int val; | |
129 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
130 | int insn = 0177777 & read_memory_integer (pc, 2); | |
131 | val = 0; | |
c5aa993b | 132 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 133 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
134 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
135 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
136 | { |
137 | val = (insn >> 9) & 7; | |
138 | if (val == 0) | |
139 | val = 8; | |
140 | } | |
c5aa993b | 141 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
142 | val = read_memory_integer (pc + 2, 4); |
143 | val >>= 2; | |
144 | return val; | |
145 | } | |
146 | ||
147 | int | |
fba45db2 | 148 | delta68_frame_num_args (struct frame_info *fi) |
392a587b JM |
149 | { |
150 | int val; | |
151 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
152 | int insn = 0177777 & read_memory_integer (pc, 2); | |
153 | val = 0; | |
c5aa993b | 154 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 155 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
156 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
157 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
158 | { |
159 | val = (insn >> 9) & 7; | |
160 | if (val == 0) | |
161 | val = 8; | |
162 | } | |
c5aa993b | 163 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
164 | val = read_memory_integer (pc + 2, 4); |
165 | val >>= 2; | |
166 | return val; | |
167 | } | |
168 | ||
169 | int | |
fba45db2 | 170 | news_frame_num_args (struct frame_info *fi) |
392a587b JM |
171 | { |
172 | int val; | |
173 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
174 | int insn = 0177777 & read_memory_integer (pc, 2); | |
175 | val = 0; | |
c5aa993b | 176 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 177 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
178 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
179 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
180 | { |
181 | val = (insn >> 9) & 7; | |
182 | if (val == 0) | |
183 | val = 8; | |
184 | } | |
c5aa993b | 185 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
186 | val = read_memory_integer (pc + 2, 4); |
187 | val >>= 2; | |
188 | return val; | |
189 | } | |
b83266a0 | 190 | |
c906108c SS |
191 | /* Push an empty stack frame, to record the current PC, etc. */ |
192 | ||
193 | void | |
fba45db2 | 194 | m68k_push_dummy_frame (void) |
c906108c SS |
195 | { |
196 | register CORE_ADDR sp = read_register (SP_REGNUM); | |
197 | register int regnum; | |
198 | char raw_buffer[12]; | |
199 | ||
200 | sp = push_word (sp, read_register (PC_REGNUM)); | |
201 | sp = push_word (sp, read_register (FP_REGNUM)); | |
202 | write_register (FP_REGNUM, sp); | |
203 | ||
204 | /* Always save the floating-point registers, whether they exist on | |
205 | this target or not. */ | |
206 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) | |
207 | { | |
208 | read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); | |
209 | sp = push_bytes (sp, raw_buffer, 12); | |
210 | } | |
211 | ||
212 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) | |
213 | { | |
214 | sp = push_word (sp, read_register (regnum)); | |
215 | } | |
216 | sp = push_word (sp, read_register (PS_REGNUM)); | |
217 | write_register (SP_REGNUM, sp); | |
218 | } | |
219 | ||
220 | /* Discard from the stack the innermost frame, | |
221 | restoring all saved registers. */ | |
222 | ||
223 | void | |
fba45db2 | 224 | m68k_pop_frame (void) |
c906108c SS |
225 | { |
226 | register struct frame_info *frame = get_current_frame (); | |
227 | register CORE_ADDR fp; | |
228 | register int regnum; | |
229 | struct frame_saved_regs fsr; | |
230 | char raw_buffer[12]; | |
231 | ||
232 | fp = FRAME_FP (frame); | |
233 | get_frame_saved_regs (frame, &fsr); | |
c5aa993b | 234 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) |
c906108c SS |
235 | { |
236 | if (fsr.regs[regnum]) | |
237 | { | |
238 | read_memory (fsr.regs[regnum], raw_buffer, 12); | |
239 | write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); | |
240 | } | |
241 | } | |
c5aa993b | 242 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) |
c906108c SS |
243 | { |
244 | if (fsr.regs[regnum]) | |
245 | { | |
246 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); | |
247 | } | |
248 | } | |
249 | if (fsr.regs[PS_REGNUM]) | |
250 | { | |
251 | write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); | |
252 | } | |
253 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
254 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
255 | write_register (SP_REGNUM, fp + 8); | |
256 | flush_cached_frames (); | |
257 | } | |
c906108c | 258 | \f |
c5aa993b | 259 | |
c906108c SS |
260 | /* Given an ip value corresponding to the start of a function, |
261 | return the ip of the first instruction after the function | |
262 | prologue. This is the generic m68k support. Machines which | |
263 | require something different can override the SKIP_PROLOGUE | |
264 | macro to point elsewhere. | |
265 | ||
266 | Some instructions which typically may appear in a function | |
267 | prologue include: | |
268 | ||
269 | A link instruction, word form: | |
270 | ||
c5aa993b | 271 | link.w %a6,&0 4e56 XXXX |
c906108c SS |
272 | |
273 | A link instruction, long form: | |
274 | ||
c5aa993b | 275 | link.l %fp,&F%1 480e XXXX XXXX |
c906108c SS |
276 | |
277 | A movm instruction to preserve integer regs: | |
278 | ||
c5aa993b | 279 | movm.l &M%1,(4,%sp) 48ef XXXX XXXX |
c906108c SS |
280 | |
281 | A fmovm instruction to preserve float regs: | |
282 | ||
c5aa993b | 283 | fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX |
c906108c SS |
284 | |
285 | Some profiling setup code (FIXME, not recognized yet): | |
286 | ||
c5aa993b JM |
287 | lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX |
288 | bsr _mcount 61ff XXXX XXXX | |
c906108c | 289 | |
c5aa993b | 290 | */ |
c906108c | 291 | |
c906108c | 292 | CORE_ADDR |
fba45db2 | 293 | m68k_skip_prologue (CORE_ADDR ip) |
c906108c SS |
294 | { |
295 | register CORE_ADDR limit; | |
296 | struct symtab_and_line sal; | |
297 | register int op; | |
298 | ||
299 | /* Find out if there is a known limit for the extent of the prologue. | |
300 | If so, ensure we don't go past it. If not, assume "infinity". */ | |
301 | ||
302 | sal = find_pc_line (ip, 0); | |
c5aa993b | 303 | limit = (sal.end) ? sal.end : (CORE_ADDR) ~ 0; |
c906108c SS |
304 | |
305 | while (ip < limit) | |
306 | { | |
307 | op = read_memory_integer (ip, 2); | |
308 | op &= 0xFFFF; | |
c5aa993b | 309 | |
89c3b6d3 PDM |
310 | if (op == P_LINKW_FP) |
311 | ip += 4; /* Skip link.w */ | |
312 | else if (op == P_PEA_FP) | |
c5aa993b | 313 | ip += 2; /* Skip pea %fp */ |
89c3b6d3 | 314 | else if (op == P_MOVL_SP_FP) |
c5aa993b | 315 | ip += 2; /* Skip move.l %sp, %fp */ |
89c3b6d3 PDM |
316 | else if (op == P_LINKL_FP) |
317 | ip += 6; /* Skip link.l */ | |
318 | else if (op == P_MOVML) | |
319 | ip += 6; /* Skip movm.l */ | |
c906108c | 320 | else if (op == P_FMOVM) |
89c3b6d3 | 321 | ip += 10; /* Skip fmovm */ |
c906108c | 322 | else |
89c3b6d3 | 323 | break; /* Found unknown code, bail out. */ |
c906108c SS |
324 | } |
325 | return (ip); | |
326 | } | |
327 | ||
328 | void | |
fba45db2 KB |
329 | m68k_find_saved_regs (struct frame_info *frame_info, |
330 | struct frame_saved_regs *saved_regs) | |
c906108c | 331 | { |
c5aa993b JM |
332 | register int regnum; |
333 | register int regmask; | |
334 | register CORE_ADDR next_addr; | |
c906108c SS |
335 | register CORE_ADDR pc; |
336 | ||
337 | /* First possible address for a pc in a call dummy for this frame. */ | |
338 | CORE_ADDR possible_call_dummy_start = | |
c5aa993b | 339 | (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 - 8 * 12; |
c906108c SS |
340 | |
341 | int nextinsn; | |
342 | memset (saved_regs, 0, sizeof (*saved_regs)); | |
343 | if ((frame_info)->pc >= possible_call_dummy_start | |
344 | && (frame_info)->pc <= (frame_info)->frame) | |
345 | { | |
346 | ||
347 | /* It is a call dummy. We could just stop now, since we know | |
c5aa993b JM |
348 | what the call dummy saves and where. But this code proceeds |
349 | to parse the "prologue" which is part of the call dummy. | |
350 | This is needlessly complex and confusing. FIXME. */ | |
c906108c SS |
351 | |
352 | next_addr = (frame_info)->frame; | |
353 | pc = possible_call_dummy_start; | |
354 | } | |
c5aa993b | 355 | else |
c906108c | 356 | { |
c5aa993b | 357 | pc = get_pc_function_start ((frame_info)->pc); |
c906108c | 358 | |
89c3b6d3 PDM |
359 | nextinsn = read_memory_integer (pc, 2); |
360 | if (P_PEA_FP == nextinsn | |
361 | && P_MOVL_SP_FP == read_memory_integer (pc + 2, 2)) | |
c906108c | 362 | { |
89c3b6d3 | 363 | /* pea %fp |
c5aa993b | 364 | move.l %sp, %fp */ |
c906108c | 365 | next_addr = frame_info->frame; |
89c3b6d3 | 366 | pc += 4; |
c906108c | 367 | } |
89c3b6d3 | 368 | else if (P_LINKL_FP == nextinsn) |
c906108c SS |
369 | /* link.l %fp */ |
370 | /* Find the address above the saved | |
371 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 PDM |
372 | { |
373 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 4); | |
374 | pc += 6; | |
375 | } | |
376 | else if (P_LINKW_FP == nextinsn) | |
c906108c SS |
377 | /* link.w %fp */ |
378 | /* Find the address above the saved | |
379 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 PDM |
380 | { |
381 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 2); | |
382 | pc += 4; | |
383 | } | |
c5aa993b JM |
384 | else |
385 | goto lose; | |
386 | ||
387 | /* If have an addal #-n, sp next, adjust next_addr. */ | |
388 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) | |
389 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; | |
390 | } | |
c5aa993b | 391 | |
89c3b6d3 | 392 | for ( ; ; ) |
c5aa993b | 393 | { |
89c3b6d3 | 394 | nextinsn = 0xffff & read_memory_integer (pc, 2); |
c5aa993b | 395 | regmask = read_memory_integer (pc + 2, 2); |
89c3b6d3 PDM |
396 | /* fmovemx to -(sp) */ |
397 | if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000) | |
c906108c | 398 | { |
89c3b6d3 PDM |
399 | /* Regmask's low bit is for register fp7, the first pushed */ |
400 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
401 | if (regmask & 1) | |
402 | saved_regs->regs[regnum] = (next_addr -= 12); | |
403 | pc += 4; | |
404 | } | |
405 | /* fmovemx to (fp + displacement) */ | |
406 | else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000) | |
407 | { | |
408 | register CORE_ADDR addr; | |
409 | ||
410 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); | |
411 | /* Regmask's low bit is for register fp7, the first pushed */ | |
412 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
413 | if (regmask & 1) | |
414 | { | |
415 | saved_regs->regs[regnum] = addr; | |
416 | addr += 12; | |
417 | } | |
418 | pc += 6; | |
419 | } | |
420 | /* moveml to (sp) */ | |
421 | else if (0044327 == nextinsn) | |
422 | { | |
423 | /* Regmask's low bit is for register 0, the first written */ | |
424 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
425 | if (regmask & 1) | |
426 | { | |
427 | saved_regs->regs[regnum] = next_addr; | |
428 | next_addr += 4; | |
429 | } | |
430 | pc += 4; | |
431 | } | |
432 | /* moveml to (fp + displacement) */ | |
433 | else if (0044356 == nextinsn) | |
434 | { | |
435 | register CORE_ADDR addr; | |
436 | ||
437 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); | |
438 | /* Regmask's low bit is for register 0, the first written */ | |
439 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
440 | if (regmask & 1) | |
441 | { | |
442 | saved_regs->regs[regnum] = addr; | |
443 | addr += 4; | |
444 | } | |
445 | pc += 6; | |
446 | } | |
447 | /* moveml to -(sp) */ | |
448 | else if (0044347 == nextinsn) | |
449 | { | |
450 | /* Regmask's low bit is for register 15, the first pushed */ | |
451 | for (regnum = 16; --regnum >= 0; regmask >>= 1) | |
452 | if (regmask & 1) | |
453 | saved_regs->regs[regnum] = (next_addr -= 4); | |
454 | pc += 4; | |
455 | } | |
456 | /* movl r,-(sp) */ | |
457 | else if (0x2f00 == (0xfff0 & nextinsn)) | |
458 | { | |
459 | regnum = 0xf & nextinsn; | |
c906108c | 460 | saved_regs->regs[regnum] = (next_addr -= 4); |
89c3b6d3 | 461 | pc += 2; |
c906108c | 462 | } |
89c3b6d3 PDM |
463 | /* fmovemx to index of sp */ |
464 | else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000) | |
465 | { | |
466 | /* Regmask's low bit is for register fp0, the first written */ | |
467 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
468 | if (regmask & 1) | |
469 | { | |
470 | saved_regs->regs[regnum] = next_addr; | |
471 | next_addr += 12; | |
472 | } | |
473 | pc += 10; | |
474 | } | |
475 | /* clrw -(sp); movw ccr,-(sp) */ | |
476 | else if (0x4267 == nextinsn && 0x42e7 == regmask) | |
477 | { | |
478 | saved_regs->regs[PS_REGNUM] = (next_addr -= 4); | |
479 | pc += 4; | |
480 | } | |
481 | else | |
482 | break; | |
c906108c | 483 | } |
c5aa993b JM |
484 | lose:; |
485 | saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8; | |
486 | saved_regs->regs[FP_REGNUM] = (frame_info)->frame; | |
487 | saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4; | |
c906108c SS |
488 | #ifdef SIG_SP_FP_OFFSET |
489 | /* Adjust saved SP_REGNUM for fake _sigtramp frames. */ | |
490 | if (frame_info->signal_handler_caller && frame_info->next) | |
491 | saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET; | |
492 | #endif | |
493 | } | |
494 | ||
495 | ||
c5aa993b | 496 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
497 | |
498 | #include <sys/procfs.h> | |
499 | ||
c60c0f5f MS |
500 | /* Prototypes for supply_gregset etc. */ |
501 | #include "gregset.h" | |
502 | ||
c906108c | 503 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
504 | two different sets, the general register set (gregset) and the floating |
505 | point register set (fpregset). For each set, there is an ioctl to get | |
506 | the current register set and another ioctl to set the current values. | |
c906108c | 507 | |
c5aa993b JM |
508 | The actual structure passed through the ioctl interface is, of course, |
509 | naturally machine dependent, and is different for each set of registers. | |
510 | For the m68k for example, the general register set is typically defined | |
511 | by: | |
c906108c | 512 | |
c5aa993b | 513 | typedef int gregset_t[18]; |
c906108c | 514 | |
c5aa993b JM |
515 | #define R_D0 0 |
516 | ... | |
517 | #define R_PS 17 | |
c906108c | 518 | |
c5aa993b | 519 | and the floating point set by: |
c906108c | 520 | |
c5aa993b JM |
521 | typedef struct fpregset { |
522 | int f_pcr; | |
523 | int f_psr; | |
524 | int f_fpiaddr; | |
525 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
526 | } fpregset_t; | |
c906108c | 527 | |
c5aa993b JM |
528 | These routines provide the packing and unpacking of gregset_t and |
529 | fpregset_t formatted data. | |
c906108c SS |
530 | |
531 | */ | |
532 | ||
533 | /* Atari SVR4 has R_SR but not R_PS */ | |
534 | ||
535 | #if !defined (R_PS) && defined (R_SR) | |
536 | #define R_PS R_SR | |
537 | #endif | |
538 | ||
539 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
540 | unpack the register contents and supply them as gdb's idea of the current |
541 | register values. */ | |
c906108c SS |
542 | |
543 | void | |
fba45db2 | 544 | supply_gregset (gregset_t *gregsetp) |
c906108c SS |
545 | { |
546 | register int regi; | |
547 | register greg_t *regp = (greg_t *) gregsetp; | |
548 | ||
c5aa993b | 549 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
550 | { |
551 | supply_register (regi, (char *) (regp + regi)); | |
552 | } | |
553 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
554 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
555 | } | |
556 | ||
557 | void | |
fba45db2 | 558 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c SS |
559 | { |
560 | register int regi; | |
561 | register greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 562 | |
c5aa993b | 563 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
564 | { |
565 | if ((regno == -1) || (regno == regi)) | |
566 | { | |
567 | *(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)]; | |
568 | } | |
569 | } | |
570 | if ((regno == -1) || (regno == PS_REGNUM)) | |
571 | { | |
572 | *(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)]; | |
573 | } | |
574 | if ((regno == -1) || (regno == PC_REGNUM)) | |
575 | { | |
576 | *(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
577 | } | |
578 | } | |
579 | ||
580 | #if defined (FP0_REGNUM) | |
581 | ||
582 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
583 | (fpregset_t *), unpack the register contents and supply them as gdb's |
584 | idea of the current floating point register values. */ | |
c906108c | 585 | |
c5aa993b | 586 | void |
fba45db2 | 587 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c SS |
588 | { |
589 | register int regi; | |
590 | char *from; | |
c5aa993b JM |
591 | |
592 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) | |
c906108c | 593 | { |
c5aa993b | 594 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
595 | supply_register (regi, from); |
596 | } | |
c5aa993b JM |
597 | supply_register (FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
598 | supply_register (FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
599 | supply_register (FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
600 | } |
601 | ||
602 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
603 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
604 | of the current floating point register set. If REGNO is -1, update | |
605 | them all. */ | |
c906108c SS |
606 | |
607 | void | |
fba45db2 | 608 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
609 | { |
610 | int regi; | |
611 | char *to; | |
612 | char *from; | |
c906108c | 613 | |
c5aa993b | 614 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) |
c906108c SS |
615 | { |
616 | if ((regno == -1) || (regno == regi)) | |
617 | { | |
618 | from = (char *) ®isters[REGISTER_BYTE (regi)]; | |
c5aa993b | 619 | to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
620 | memcpy (to, from, REGISTER_RAW_SIZE (regi)); |
621 | } | |
622 | } | |
623 | if ((regno == -1) || (regno == FPC_REGNUM)) | |
624 | { | |
c5aa993b | 625 | fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)]; |
c906108c SS |
626 | } |
627 | if ((regno == -1) || (regno == FPS_REGNUM)) | |
628 | { | |
c5aa993b | 629 | fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)]; |
c906108c SS |
630 | } |
631 | if ((regno == -1) || (regno == FPI_REGNUM)) | |
632 | { | |
c5aa993b | 633 | fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)]; |
c906108c SS |
634 | } |
635 | } | |
636 | ||
c5aa993b | 637 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 638 | |
c5aa993b | 639 | #endif /* USE_PROC_FS */ |
c906108c | 640 | |
c906108c SS |
641 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
642 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
643 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
644 | This routine returns true on success. */ | |
645 | ||
2765b798 AC |
646 | /* NOTE: cagney/2000-11-08: For this function to be fully multi-arched |
647 | the macro's JB_PC and JB_ELEMENT_SIZE would need to be moved into | |
648 | the ``struct gdbarch_tdep'' object and then set on a target ISA/ABI | |
649 | dependant basis. */ | |
650 | ||
c906108c | 651 | int |
f4281f55 | 652 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 653 | { |
2765b798 | 654 | #if defined (JB_PC) && defined (JB_ELEMENT_SIZE) |
35fc8285 | 655 | char *buf; |
c906108c SS |
656 | CORE_ADDR sp, jb_addr; |
657 | ||
35fc8285 | 658 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 659 | sp = read_register (SP_REGNUM); |
c906108c | 660 | |
c5aa993b | 661 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
c906108c SS |
662 | buf, |
663 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
664 | return 0; | |
665 | ||
666 | jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
667 | ||
668 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
669 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
670 | return 0; | |
671 | ||
672 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
673 | ||
674 | return 1; | |
2765b798 | 675 | #else |
8e65ff28 AC |
676 | internal_error (__FILE__, __LINE__, |
677 | "m68k_get_longjmp_target: not implemented"); | |
2765b798 AC |
678 | return 0; |
679 | #endif | |
c906108c | 680 | } |
c906108c SS |
681 | |
682 | /* Immediately after a function call, return the saved pc before the frame | |
683 | is setup. For sun3's, we check for the common case of being inside of a | |
684 | system call, and if so, we know that Sun pushes the call # on the stack | |
685 | prior to doing the trap. */ | |
686 | ||
687 | CORE_ADDR | |
fba45db2 | 688 | m68k_saved_pc_after_call (struct frame_info *frame) |
c906108c SS |
689 | { |
690 | #ifdef SYSCALL_TRAP | |
691 | int op; | |
692 | ||
693 | op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2); | |
694 | ||
695 | if (op == SYSCALL_TRAP) | |
696 | return read_memory_integer (read_register (SP_REGNUM) + 4, 4); | |
697 | else | |
698 | #endif /* SYSCALL_TRAP */ | |
699 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
700 | } | |
701 | ||
2acceee2 | 702 | |
c906108c | 703 | void |
fba45db2 | 704 | _initialize_m68k_tdep (void) |
c906108c SS |
705 | { |
706 | tm_print_insn = print_insn_m68k; | |
707 | } |