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 | |
fba45db2 | 47 | altos_skip_prologue (CORE_ADDR pc) |
b83266a0 SS |
48 | { |
49 | register int op = read_memory_integer (pc, 2); | |
89c3b6d3 | 50 | if (op == P_LINKW_FP) |
c5aa993b | 51 | pc += 4; /* Skip link #word */ |
89c3b6d3 | 52 | else if (op == P_LINKL_FP) |
c5aa993b | 53 | pc += 6; /* Skip link #long */ |
b83266a0 SS |
54 | /* Not sure why branches are here. */ |
55 | /* From tm-isi.h, tm-altos.h */ | |
56 | else if (op == 0060000) | |
c5aa993b | 57 | pc += 4; /* Skip bra #word */ |
b83266a0 | 58 | else if (op == 00600377) |
c5aa993b | 59 | pc += 6; /* skip bra #long */ |
b83266a0 | 60 | else if ((op & 0177400) == 0060000) |
c5aa993b | 61 | pc += 2; /* skip bra #char */ |
b83266a0 SS |
62 | return pc; |
63 | } | |
64 | ||
65 | /* The only reason this is here is the tm-isi.h reference below. It | |
66 | was moved back here from tm-m68k.h. FIXME? */ | |
67 | ||
68 | extern CORE_ADDR | |
fba45db2 | 69 | isi_skip_prologue (CORE_ADDR pc) |
b83266a0 SS |
70 | { |
71 | register int op = read_memory_integer (pc, 2); | |
89c3b6d3 | 72 | if (op == P_LINKW_FP) |
c5aa993b | 73 | pc += 4; /* Skip link #word */ |
89c3b6d3 | 74 | else if (op == P_LINKL_FP) |
c5aa993b | 75 | pc += 6; /* Skip link #long */ |
b83266a0 SS |
76 | /* Not sure why branches are here. */ |
77 | /* From tm-isi.h, tm-altos.h */ | |
78 | else if (op == 0060000) | |
c5aa993b | 79 | pc += 4; /* Skip bra #word */ |
b83266a0 | 80 | else if (op == 00600377) |
c5aa993b | 81 | pc += 6; /* skip bra #long */ |
b83266a0 | 82 | else if ((op & 0177400) == 0060000) |
c5aa993b | 83 | pc += 2; /* skip bra #char */ |
b83266a0 SS |
84 | return pc; |
85 | } | |
86 | ||
89c3b6d3 | 87 | int |
fba45db2 | 88 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
89c3b6d3 | 89 | { |
1bd54964 AC |
90 | if (name != NULL) |
91 | return strcmp (name, "_sigcode") == 0; | |
92 | else | |
93 | return 0; | |
89c3b6d3 PDM |
94 | } |
95 | ||
96 | CORE_ADDR | |
fba45db2 | 97 | delta68_frame_args_address (struct frame_info *frame_info) |
89c3b6d3 PDM |
98 | { |
99 | /* we assume here that the only frameless functions are the system calls | |
100 | or other functions who do not put anything on the stack. */ | |
101 | if (frame_info->signal_handler_caller) | |
102 | return frame_info->frame + 12; | |
103 | else if (frameless_look_for_prologue (frame_info)) | |
104 | { | |
105 | /* Check for an interrupted system call */ | |
106 | if (frame_info->next && frame_info->next->signal_handler_caller) | |
107 | return frame_info->next->frame + 16; | |
108 | else | |
109 | return frame_info->frame + 4; | |
110 | } | |
111 | else | |
112 | return frame_info->frame; | |
113 | } | |
114 | ||
115 | CORE_ADDR | |
fba45db2 | 116 | delta68_frame_saved_pc (struct frame_info *frame_info) |
89c3b6d3 PDM |
117 | { |
118 | return read_memory_integer (delta68_frame_args_address (frame_info) + 4, 4); | |
119 | } | |
120 | ||
392a587b JM |
121 | /* Return number of args passed to a frame. |
122 | Can return -1, meaning no way to tell. */ | |
123 | ||
124 | int | |
fba45db2 | 125 | isi_frame_num_args (struct frame_info *fi) |
392a587b JM |
126 | { |
127 | int val; | |
128 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
129 | int insn = 0177777 & read_memory_integer (pc, 2); | |
130 | val = 0; | |
c5aa993b | 131 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 132 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
133 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
134 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
135 | { |
136 | val = (insn >> 9) & 7; | |
137 | if (val == 0) | |
138 | val = 8; | |
139 | } | |
c5aa993b | 140 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
141 | val = read_memory_integer (pc + 2, 4); |
142 | val >>= 2; | |
143 | return val; | |
144 | } | |
145 | ||
146 | int | |
fba45db2 | 147 | delta68_frame_num_args (struct frame_info *fi) |
392a587b JM |
148 | { |
149 | int val; | |
150 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
151 | int insn = 0177777 & read_memory_integer (pc, 2); | |
152 | val = 0; | |
c5aa993b | 153 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 154 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
155 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
156 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
157 | { |
158 | val = (insn >> 9) & 7; | |
159 | if (val == 0) | |
160 | val = 8; | |
161 | } | |
c5aa993b | 162 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
163 | val = read_memory_integer (pc + 2, 4); |
164 | val >>= 2; | |
165 | return val; | |
166 | } | |
167 | ||
168 | int | |
fba45db2 | 169 | news_frame_num_args (struct frame_info *fi) |
392a587b JM |
170 | { |
171 | int val; | |
172 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
173 | int insn = 0177777 & read_memory_integer (pc, 2); | |
174 | val = 0; | |
c5aa993b | 175 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 176 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
177 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
178 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
179 | { |
180 | val = (insn >> 9) & 7; | |
181 | if (val == 0) | |
182 | val = 8; | |
183 | } | |
c5aa993b | 184 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
185 | val = read_memory_integer (pc + 2, 4); |
186 | val >>= 2; | |
187 | return val; | |
188 | } | |
b83266a0 | 189 | |
c906108c SS |
190 | /* Push an empty stack frame, to record the current PC, etc. */ |
191 | ||
192 | void | |
fba45db2 | 193 | m68k_push_dummy_frame (void) |
c906108c SS |
194 | { |
195 | register CORE_ADDR sp = read_register (SP_REGNUM); | |
196 | register int regnum; | |
197 | char raw_buffer[12]; | |
198 | ||
199 | sp = push_word (sp, read_register (PC_REGNUM)); | |
200 | sp = push_word (sp, read_register (FP_REGNUM)); | |
201 | write_register (FP_REGNUM, sp); | |
202 | ||
203 | /* Always save the floating-point registers, whether they exist on | |
204 | this target or not. */ | |
205 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) | |
206 | { | |
207 | read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); | |
208 | sp = push_bytes (sp, raw_buffer, 12); | |
209 | } | |
210 | ||
211 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) | |
212 | { | |
213 | sp = push_word (sp, read_register (regnum)); | |
214 | } | |
215 | sp = push_word (sp, read_register (PS_REGNUM)); | |
216 | write_register (SP_REGNUM, sp); | |
217 | } | |
218 | ||
219 | /* Discard from the stack the innermost frame, | |
220 | restoring all saved registers. */ | |
221 | ||
222 | void | |
fba45db2 | 223 | m68k_pop_frame (void) |
c906108c SS |
224 | { |
225 | register struct frame_info *frame = get_current_frame (); | |
226 | register CORE_ADDR fp; | |
227 | register int regnum; | |
228 | struct frame_saved_regs fsr; | |
229 | char raw_buffer[12]; | |
230 | ||
231 | fp = FRAME_FP (frame); | |
232 | get_frame_saved_regs (frame, &fsr); | |
c5aa993b | 233 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) |
c906108c SS |
234 | { |
235 | if (fsr.regs[regnum]) | |
236 | { | |
237 | read_memory (fsr.regs[regnum], raw_buffer, 12); | |
238 | write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); | |
239 | } | |
240 | } | |
c5aa993b | 241 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) |
c906108c SS |
242 | { |
243 | if (fsr.regs[regnum]) | |
244 | { | |
245 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); | |
246 | } | |
247 | } | |
248 | if (fsr.regs[PS_REGNUM]) | |
249 | { | |
250 | write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); | |
251 | } | |
252 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
253 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
254 | write_register (SP_REGNUM, fp + 8); | |
255 | flush_cached_frames (); | |
256 | } | |
c906108c | 257 | \f |
c5aa993b | 258 | |
c906108c SS |
259 | /* Given an ip value corresponding to the start of a function, |
260 | return the ip of the first instruction after the function | |
261 | prologue. This is the generic m68k support. Machines which | |
262 | require something different can override the SKIP_PROLOGUE | |
263 | macro to point elsewhere. | |
264 | ||
265 | Some instructions which typically may appear in a function | |
266 | prologue include: | |
267 | ||
268 | A link instruction, word form: | |
269 | ||
c5aa993b | 270 | link.w %a6,&0 4e56 XXXX |
c906108c SS |
271 | |
272 | A link instruction, long form: | |
273 | ||
c5aa993b | 274 | link.l %fp,&F%1 480e XXXX XXXX |
c906108c SS |
275 | |
276 | A movm instruction to preserve integer regs: | |
277 | ||
c5aa993b | 278 | movm.l &M%1,(4,%sp) 48ef XXXX XXXX |
c906108c SS |
279 | |
280 | A fmovm instruction to preserve float regs: | |
281 | ||
c5aa993b | 282 | fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX |
c906108c SS |
283 | |
284 | Some profiling setup code (FIXME, not recognized yet): | |
285 | ||
c5aa993b JM |
286 | lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX |
287 | bsr _mcount 61ff XXXX XXXX | |
c906108c | 288 | |
c5aa993b | 289 | */ |
c906108c | 290 | |
c906108c | 291 | CORE_ADDR |
fba45db2 | 292 | m68k_skip_prologue (CORE_ADDR ip) |
c906108c SS |
293 | { |
294 | register CORE_ADDR limit; | |
295 | struct symtab_and_line sal; | |
296 | register int op; | |
297 | ||
298 | /* Find out if there is a known limit for the extent of the prologue. | |
299 | If so, ensure we don't go past it. If not, assume "infinity". */ | |
300 | ||
301 | sal = find_pc_line (ip, 0); | |
c5aa993b | 302 | limit = (sal.end) ? sal.end : (CORE_ADDR) ~ 0; |
c906108c SS |
303 | |
304 | while (ip < limit) | |
305 | { | |
306 | op = read_memory_integer (ip, 2); | |
307 | op &= 0xFFFF; | |
c5aa993b | 308 | |
89c3b6d3 PDM |
309 | if (op == P_LINKW_FP) |
310 | ip += 4; /* Skip link.w */ | |
311 | else if (op == P_PEA_FP) | |
c5aa993b | 312 | ip += 2; /* Skip pea %fp */ |
89c3b6d3 | 313 | else if (op == P_MOVL_SP_FP) |
c5aa993b | 314 | ip += 2; /* Skip move.l %sp, %fp */ |
89c3b6d3 PDM |
315 | else if (op == P_LINKL_FP) |
316 | ip += 6; /* Skip link.l */ | |
317 | else if (op == P_MOVML) | |
318 | ip += 6; /* Skip movm.l */ | |
c906108c | 319 | else if (op == P_FMOVM) |
89c3b6d3 | 320 | ip += 10; /* Skip fmovm */ |
c906108c | 321 | else |
89c3b6d3 | 322 | break; /* Found unknown code, bail out. */ |
c906108c SS |
323 | } |
324 | return (ip); | |
325 | } | |
326 | ||
327 | void | |
fba45db2 KB |
328 | m68k_find_saved_regs (struct frame_info *frame_info, |
329 | struct frame_saved_regs *saved_regs) | |
c906108c | 330 | { |
c5aa993b JM |
331 | register int regnum; |
332 | register int regmask; | |
333 | register CORE_ADDR next_addr; | |
c906108c SS |
334 | register CORE_ADDR pc; |
335 | ||
336 | /* First possible address for a pc in a call dummy for this frame. */ | |
337 | CORE_ADDR possible_call_dummy_start = | |
c5aa993b | 338 | (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 - 8 * 12; |
c906108c SS |
339 | |
340 | int nextinsn; | |
341 | memset (saved_regs, 0, sizeof (*saved_regs)); | |
342 | if ((frame_info)->pc >= possible_call_dummy_start | |
343 | && (frame_info)->pc <= (frame_info)->frame) | |
344 | { | |
345 | ||
346 | /* It is a call dummy. We could just stop now, since we know | |
c5aa993b JM |
347 | what the call dummy saves and where. But this code proceeds |
348 | to parse the "prologue" which is part of the call dummy. | |
349 | This is needlessly complex and confusing. FIXME. */ | |
c906108c SS |
350 | |
351 | next_addr = (frame_info)->frame; | |
352 | pc = possible_call_dummy_start; | |
353 | } | |
c5aa993b | 354 | else |
c906108c | 355 | { |
c5aa993b | 356 | pc = get_pc_function_start ((frame_info)->pc); |
c906108c | 357 | |
89c3b6d3 PDM |
358 | nextinsn = read_memory_integer (pc, 2); |
359 | if (P_PEA_FP == nextinsn | |
360 | && P_MOVL_SP_FP == read_memory_integer (pc + 2, 2)) | |
c906108c | 361 | { |
89c3b6d3 | 362 | /* pea %fp |
c5aa993b | 363 | move.l %sp, %fp */ |
c906108c | 364 | next_addr = frame_info->frame; |
89c3b6d3 | 365 | pc += 4; |
c906108c | 366 | } |
89c3b6d3 | 367 | else if (P_LINKL_FP == nextinsn) |
c906108c SS |
368 | /* link.l %fp */ |
369 | /* Find the address above the saved | |
370 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 PDM |
371 | { |
372 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 4); | |
373 | pc += 6; | |
374 | } | |
375 | else if (P_LINKW_FP == nextinsn) | |
c906108c SS |
376 | /* link.w %fp */ |
377 | /* Find the address above the saved | |
378 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 PDM |
379 | { |
380 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 2); | |
381 | pc += 4; | |
382 | } | |
c5aa993b JM |
383 | else |
384 | goto lose; | |
385 | ||
386 | /* If have an addal #-n, sp next, adjust next_addr. */ | |
387 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) | |
388 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; | |
389 | } | |
c5aa993b | 390 | |
89c3b6d3 | 391 | for ( ; ; ) |
c5aa993b | 392 | { |
89c3b6d3 | 393 | nextinsn = 0xffff & read_memory_integer (pc, 2); |
c5aa993b | 394 | regmask = read_memory_integer (pc + 2, 2); |
89c3b6d3 PDM |
395 | /* fmovemx to -(sp) */ |
396 | if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000) | |
c906108c | 397 | { |
89c3b6d3 PDM |
398 | /* Regmask's low bit is for register fp7, the first pushed */ |
399 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
400 | if (regmask & 1) | |
401 | saved_regs->regs[regnum] = (next_addr -= 12); | |
402 | pc += 4; | |
403 | } | |
404 | /* fmovemx to (fp + displacement) */ | |
405 | else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000) | |
406 | { | |
407 | register CORE_ADDR addr; | |
408 | ||
409 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); | |
410 | /* Regmask's low bit is for register fp7, the first pushed */ | |
411 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
412 | if (regmask & 1) | |
413 | { | |
414 | saved_regs->regs[regnum] = addr; | |
415 | addr += 12; | |
416 | } | |
417 | pc += 6; | |
418 | } | |
419 | /* moveml to (sp) */ | |
420 | else if (0044327 == nextinsn) | |
421 | { | |
422 | /* Regmask's low bit is for register 0, the first written */ | |
423 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
424 | if (regmask & 1) | |
425 | { | |
426 | saved_regs->regs[regnum] = next_addr; | |
427 | next_addr += 4; | |
428 | } | |
429 | pc += 4; | |
430 | } | |
431 | /* moveml to (fp + displacement) */ | |
432 | else if (0044356 == nextinsn) | |
433 | { | |
434 | register CORE_ADDR addr; | |
435 | ||
436 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); | |
437 | /* Regmask's low bit is for register 0, the first written */ | |
438 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
439 | if (regmask & 1) | |
440 | { | |
441 | saved_regs->regs[regnum] = addr; | |
442 | addr += 4; | |
443 | } | |
444 | pc += 6; | |
445 | } | |
446 | /* moveml to -(sp) */ | |
447 | else if (0044347 == nextinsn) | |
448 | { | |
449 | /* Regmask's low bit is for register 15, the first pushed */ | |
450 | for (regnum = 16; --regnum >= 0; regmask >>= 1) | |
451 | if (regmask & 1) | |
452 | saved_regs->regs[regnum] = (next_addr -= 4); | |
453 | pc += 4; | |
454 | } | |
455 | /* movl r,-(sp) */ | |
456 | else if (0x2f00 == (0xfff0 & nextinsn)) | |
457 | { | |
458 | regnum = 0xf & nextinsn; | |
c906108c | 459 | saved_regs->regs[regnum] = (next_addr -= 4); |
89c3b6d3 | 460 | pc += 2; |
c906108c | 461 | } |
89c3b6d3 PDM |
462 | /* fmovemx to index of sp */ |
463 | else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000) | |
464 | { | |
465 | /* Regmask's low bit is for register fp0, the first written */ | |
466 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
467 | if (regmask & 1) | |
468 | { | |
469 | saved_regs->regs[regnum] = next_addr; | |
470 | next_addr += 12; | |
471 | } | |
472 | pc += 10; | |
473 | } | |
474 | /* clrw -(sp); movw ccr,-(sp) */ | |
475 | else if (0x4267 == nextinsn && 0x42e7 == regmask) | |
476 | { | |
477 | saved_regs->regs[PS_REGNUM] = (next_addr -= 4); | |
478 | pc += 4; | |
479 | } | |
480 | else | |
481 | break; | |
c906108c | 482 | } |
c5aa993b JM |
483 | lose:; |
484 | saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8; | |
485 | saved_regs->regs[FP_REGNUM] = (frame_info)->frame; | |
486 | saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4; | |
c906108c SS |
487 | #ifdef SIG_SP_FP_OFFSET |
488 | /* Adjust saved SP_REGNUM for fake _sigtramp frames. */ | |
489 | if (frame_info->signal_handler_caller && frame_info->next) | |
490 | saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET; | |
491 | #endif | |
492 | } | |
493 | ||
494 | ||
c5aa993b | 495 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
496 | |
497 | #include <sys/procfs.h> | |
498 | ||
c60c0f5f MS |
499 | /* Prototypes for supply_gregset etc. */ |
500 | #include "gregset.h" | |
501 | ||
c906108c | 502 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
503 | two different sets, the general register set (gregset) and the floating |
504 | point register set (fpregset). For each set, there is an ioctl to get | |
505 | the current register set and another ioctl to set the current values. | |
c906108c | 506 | |
c5aa993b JM |
507 | The actual structure passed through the ioctl interface is, of course, |
508 | naturally machine dependent, and is different for each set of registers. | |
509 | For the m68k for example, the general register set is typically defined | |
510 | by: | |
c906108c | 511 | |
c5aa993b | 512 | typedef int gregset_t[18]; |
c906108c | 513 | |
c5aa993b JM |
514 | #define R_D0 0 |
515 | ... | |
516 | #define R_PS 17 | |
c906108c | 517 | |
c5aa993b | 518 | and the floating point set by: |
c906108c | 519 | |
c5aa993b JM |
520 | typedef struct fpregset { |
521 | int f_pcr; | |
522 | int f_psr; | |
523 | int f_fpiaddr; | |
524 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
525 | } fpregset_t; | |
c906108c | 526 | |
c5aa993b JM |
527 | These routines provide the packing and unpacking of gregset_t and |
528 | fpregset_t formatted data. | |
c906108c SS |
529 | |
530 | */ | |
531 | ||
532 | /* Atari SVR4 has R_SR but not R_PS */ | |
533 | ||
534 | #if !defined (R_PS) && defined (R_SR) | |
535 | #define R_PS R_SR | |
536 | #endif | |
537 | ||
538 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
539 | unpack the register contents and supply them as gdb's idea of the current |
540 | register values. */ | |
c906108c SS |
541 | |
542 | void | |
fba45db2 | 543 | supply_gregset (gregset_t *gregsetp) |
c906108c SS |
544 | { |
545 | register int regi; | |
546 | register greg_t *regp = (greg_t *) gregsetp; | |
547 | ||
c5aa993b | 548 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
549 | { |
550 | supply_register (regi, (char *) (regp + regi)); | |
551 | } | |
552 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
553 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
554 | } | |
555 | ||
556 | void | |
fba45db2 | 557 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c SS |
558 | { |
559 | register int regi; | |
560 | register greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 561 | |
c5aa993b | 562 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
563 | { |
564 | if ((regno == -1) || (regno == regi)) | |
565 | { | |
566 | *(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)]; | |
567 | } | |
568 | } | |
569 | if ((regno == -1) || (regno == PS_REGNUM)) | |
570 | { | |
571 | *(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)]; | |
572 | } | |
573 | if ((regno == -1) || (regno == PC_REGNUM)) | |
574 | { | |
575 | *(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
576 | } | |
577 | } | |
578 | ||
579 | #if defined (FP0_REGNUM) | |
580 | ||
581 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
582 | (fpregset_t *), unpack the register contents and supply them as gdb's |
583 | idea of the current floating point register values. */ | |
c906108c | 584 | |
c5aa993b | 585 | void |
fba45db2 | 586 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c SS |
587 | { |
588 | register int regi; | |
589 | char *from; | |
c5aa993b JM |
590 | |
591 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) | |
c906108c | 592 | { |
c5aa993b | 593 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
594 | supply_register (regi, from); |
595 | } | |
c5aa993b JM |
596 | supply_register (FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
597 | supply_register (FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
598 | supply_register (FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
599 | } |
600 | ||
601 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
602 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
603 | of the current floating point register set. If REGNO is -1, update | |
604 | them all. */ | |
c906108c SS |
605 | |
606 | void | |
fba45db2 | 607 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
608 | { |
609 | int regi; | |
610 | char *to; | |
611 | char *from; | |
c906108c | 612 | |
c5aa993b | 613 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) |
c906108c SS |
614 | { |
615 | if ((regno == -1) || (regno == regi)) | |
616 | { | |
617 | from = (char *) ®isters[REGISTER_BYTE (regi)]; | |
c5aa993b | 618 | to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
619 | memcpy (to, from, REGISTER_RAW_SIZE (regi)); |
620 | } | |
621 | } | |
622 | if ((regno == -1) || (regno == FPC_REGNUM)) | |
623 | { | |
c5aa993b | 624 | fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)]; |
c906108c SS |
625 | } |
626 | if ((regno == -1) || (regno == FPS_REGNUM)) | |
627 | { | |
c5aa993b | 628 | fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)]; |
c906108c SS |
629 | } |
630 | if ((regno == -1) || (regno == FPI_REGNUM)) | |
631 | { | |
c5aa993b | 632 | fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)]; |
c906108c SS |
633 | } |
634 | } | |
635 | ||
c5aa993b | 636 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 637 | |
c5aa993b | 638 | #endif /* USE_PROC_FS */ |
c906108c SS |
639 | |
640 | #ifdef GET_LONGJMP_TARGET | |
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 | ||
646 | int | |
fba45db2 | 647 | get_longjmp_target (CORE_ADDR *pc) |
c906108c SS |
648 | { |
649 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; | |
650 | CORE_ADDR sp, jb_addr; | |
651 | ||
c5aa993b | 652 | sp = read_register (SP_REGNUM); |
c906108c | 653 | |
c5aa993b | 654 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
c906108c SS |
655 | buf, |
656 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
657 | return 0; | |
658 | ||
659 | jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
660 | ||
661 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
662 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
663 | return 0; | |
664 | ||
665 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
666 | ||
667 | return 1; | |
668 | } | |
669 | #endif /* GET_LONGJMP_TARGET */ | |
670 | ||
671 | /* Immediately after a function call, return the saved pc before the frame | |
672 | is setup. For sun3's, we check for the common case of being inside of a | |
673 | system call, and if so, we know that Sun pushes the call # on the stack | |
674 | prior to doing the trap. */ | |
675 | ||
676 | CORE_ADDR | |
fba45db2 | 677 | m68k_saved_pc_after_call (struct frame_info *frame) |
c906108c SS |
678 | { |
679 | #ifdef SYSCALL_TRAP | |
680 | int op; | |
681 | ||
682 | op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2); | |
683 | ||
684 | if (op == SYSCALL_TRAP) | |
685 | return read_memory_integer (read_register (SP_REGNUM) + 4, 4); | |
686 | else | |
687 | #endif /* SYSCALL_TRAP */ | |
688 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
689 | } | |
690 | ||
2acceee2 | 691 | |
c906108c | 692 | void |
fba45db2 | 693 | _initialize_m68k_tdep (void) |
c906108c SS |
694 | { |
695 | tm_print_insn = print_insn_m68k; | |
696 | } |