1/*
2Copyright (c) 2003-2006 Hewlett-Packard Development Company, L.P.
3Permission is hereby granted, free of charge, to any person
4obtaining a copy of this software and associated documentation
5files (the "Software"), to deal in the Software without
6restriction, including without limitation the rights to use,
7copy, modify, merge, publish, distribute, sublicense, and/or sell
8copies of the Software, and to permit persons to whom the
9Software is furnished to do so, subject to the following
10conditions:
11
12The above copyright notice and this permission notice shall be
13included in all copies or substantial portions of the Software.
14
15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
17OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22OTHER DEALINGS IN THE SOFTWARE.
23*/
24
25#include "uwx_env.h"
26#include "uwx_context.h"
27#include "uwx_utable.h"
28#include "uwx_uinfo.h"
29#include "uwx_scoreboard.h"
30#include "uwx_str.h"
31#include "uwx_step.h"
32#include "uwx_trace.h"
33
34/*
35 * uwx_step.c
36 *
37 * This file contains the routines for stepping from one frame
38 * into its callers frame. The context for the current frame
39 * is maintained inside the current unwind environment
40 * (struct uwx_env), and is updated with each call to
41 * uwx_step() to refer to the previous frame.
42 */
43
44
45/* Forward Declarations */
46
47int uwx_decode_uvec(struct uwx_env *env, uint64_t *uvec, uint64_t **rstate);
48int uwx_restore_reg(struct uwx_env *env, uint64_t rstate,
49 uint64_t *valp, uint64_t *histp);
50int uwx_restore_freg(struct uwx_env *env, uint64_t rstate,
51 uint64_t *valp, uint64_t *histp);
52int uwx_restore_nat(struct uwx_env *env, uint64_t rstate, int unat);
53
54
55/* uwx_lookupip_hook: Hook routine so dynamic instrumentation */
56/* tools can intercept Lookup IP events. When not */
57/* intercepted, it just returns "Not found", so that */
58/* the callback routine is invoked. */
59
60/*ARGSUSED*/
61int uwx_lookupip_hook(int request, uint64_t ip, intptr_t tok, uint64_t **vecp,
62 size_t uvecsize)
63{
64 return UWX_LKUP_NOTFOUND;
65}
66
67
68/* uwx_get_frame_info: Gets unwind info for current frame */
69
70int uwx_get_frame_info(struct uwx_env *env)
71{
72 int i;
73 int status;
74 int cbstatus;
75 int cbcalled = 0;
76 uint64_t ip;
77 uint64_t *uvec;
78 uint64_t *rstate;
79 struct uwx_utable_entry uentry;
80 uint64_t uinfop;
81 uint64_t uvecout[UVECSIZE];
82
83 if (env->copyin == 0 || env->lookupip == 0)
84 return UWX_ERR_NOCALLBACKS;
85
86 env->ptr_size = DWORDSZ;
87 env->code_start = 0;
88 env->function_offset = -1LL;
89 env->function_name = 0;
90 env->module_name = 0;
91 env->abi_context = 0;
92 uwx_reset_str_pool(env);
93
94 /* Use the lookup IP callback routine to find out about the */
95 /* current IP. If the predicate registers are valid, pass them */
96 /* in the uvec. */
97
98 /* When self-unwinding, we call a hook routine before the */
99 /* callback. If the application is running under control of */
100 /* a dynamic instrumentation tool, that tool will have an */
101 /* opportunity to intercept lookup IP requests. */
102
103 i = 0;
104 uvecout[i++] = UWX_KEY_VERSION;
105 uvecout[i++] = UWX_VERSION;
106 if (env->context.valid_regs & (1 << UWX_REG_PREDS)) {
107 uvecout[i++] = UWX_KEY_PREDS;
108 uvecout[i++] = env->context.special[UWX_REG_PREDS];
109 }
110 uvecout[i++] = UWX_KEY_END;
111 uvecout[i++] = 0;
112 uvec = uvecout;
113 cbstatus = UWX_LKUP_NOTFOUND;
114 ip = env->context.special[UWX_REG_IP];
115 env->remapped_ip = ip;
116
117 /* Call the hook routine. */
118
119 if (env->remote == 0)
120 cbstatus = uwx_lookupip_hook(UWX_LKUP_LOOKUP, ip, env->cb_token, &uvec,
121 sizeof(uvecout));
122
123 /* If the hook routine remapped the IP, use the new IP for */
124 /* the callback instead of the original IP. */
125
126 if (cbstatus == UWX_LKUP_REMAP) {
127 for (i = 0; uvec[i] != UWX_KEY_END; i += 2) {
128 switch ((int)uvec[i]) {
129 case UWX_KEY_NEWIP:
130 ip = uvec[i+1];
131 break;
132 }
133 }
134 env->remapped_ip = ip;
135 }
136
137 /* Now call the callback routine unless the hook routine gave */
138 /* us all the info. */
139
140 if (cbstatus == UWX_LKUP_NOTFOUND || cbstatus == UWX_LKUP_REMAP) {
141 cbcalled = 1;
142 cbstatus = (*env->lookupip)(UWX_LKUP_LOOKUP, ip, env->cb_token, &uvec);
143 }
144
145 /* If the callback routine remapped the IP, call it one more time */
146 /* with the new IP. */
147
148 if (cbstatus == UWX_LKUP_REMAP) {
149 for (i = 0; uvec[i] != UWX_KEY_END; i += 2) {
150 switch ((int)uvec[i]) {
151 case UWX_KEY_NEWIP:
152 ip = uvec[i+1];
153 break;
154 }
155 }
156 env->remapped_ip = ip;
157 cbstatus = (*env->lookupip)(UWX_LKUP_LOOKUP, ip, env->cb_token, &uvec);
158 }
159
160 /* If NOTFOUND, there's nothing we can do but return an error. */
161
162 if (cbstatus == UWX_LKUP_NOTFOUND) {
163 status = UWX_ERR_IPNOTFOUND;
164 }
165
166 /* If the callback returns an unwind table, we need to */
167 /* search the table for an unwind entry that describes the */
168 /* code region of interest, then decode the unwind information */
169 /* associated with that unwind table entry, and store the */
170 /* resulting register state array in the unwind environment */
171 /* block. */
172
173 else if (cbstatus == UWX_LKUP_UTABLE) {
174 status = uwx_search_utable(env, ip, uvec, &uentry);
175 if (cbcalled)
176 (void) (*env->lookupip)(UWX_LKUP_FREE, 0, env->cb_token, &uvec);
177 if (status == UWX_OK) {
178 env->ptr_size = uentry.ptr_size;
179 env->code_start = uentry.code_start;
180 status = uwx_decode_uinfo(env, &uentry, &rstate);
181 }
182 if (status == UWX_ERR_NOUENTRY || status == UWX_ERR_NOUDESC)
183 status = uwx_default_rstate(env, &rstate);
184 if (status == UWX_OK)
185 env->rstate = rstate;
186 }
187
188 /* If the callback returns an unwind info block, we can */
189 /* proceed directly to decoding the unwind information. */
190
191 else if (cbstatus == UWX_LKUP_UINFO) {
192 uentry.ptr_size = DWORDSZ;
193 uentry.code_start = 0;
194 uentry.code_end = 0;
195 uentry.unwind_info = 0;
196 uentry.unwind_flags = 0;
197 for (i = 0; uvec[i] != UWX_KEY_END; i += 2) {
198 switch ((int)uvec[i]) {
199 case UWX_KEY_UFLAGS:
200 uentry.unwind_flags = uvec[i+1];
201 if (uentry.unwind_flags & UNWIND_TBL_32BIT)
202 uentry.ptr_size = WORDSZ;
203 break;
204 case UWX_KEY_UINFO:
205 uentry.unwind_info = uvec[i+1];
206 break;
207 case UWX_KEY_GP:
208 uwx_set_reg(env, UWX_REG_GP, uvec[i+1]);
209 break;
210 case UWX_KEY_MODULE:
211 env->module_name =
212 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
213 break;
214 case UWX_KEY_FUNC:
215 env->function_name =
216 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
217 break;
218 case UWX_KEY_FUNCSTART:
219 uentry.code_start = uvec[i+1];
220 env->code_start = uentry.code_start;
221 break;
222 }
223 }
224 env->ptr_size = uentry.ptr_size;
225 if (cbcalled)
226 (void) (*env->lookupip)(UWX_LKUP_FREE, 0, env->cb_token, &uvec);
227 status = uwx_decode_uinfo(env, &uentry, &rstate);
228 if (status == UWX_ERR_NOUDESC)
229 status = uwx_default_rstate(env, &rstate);
230 if (status == UWX_OK)
231 env->rstate = rstate;
232 }
233
234 /* If the callback returns a frame description (in the form */
235 /* of an update vector), convert the update vector into a */
236 /* register state array, then invoke the callback again to */
237 /* let it free any memory it allocated. */
238
239 else if (cbstatus == UWX_LKUP_FDESC) {
240 status = uwx_decode_uvec(env, uvec, &rstate);
241 if (cbcalled)
242 (void) (*env->lookupip)(UWX_LKUP_FREE, 0, env->cb_token, &uvec);
243 if (status == UWX_OK)
244 env->rstate = rstate;
245 }
246
247 /* Any other return from the callback is an error. */
248
249 else {
250 status = UWX_ERR_LOOKUPERR;
251 }
252 return status;
253}
254
255
256/* uwx_restore_markers: Restores the stack markers -- PSP, RP, PFS */
257
258int uwx_restore_markers(struct uwx_env *env)
259{
260 int status;
261 uint64_t val;
262 uint64_t hist;
263
264 if ((env->context.valid_regs & VALID_BASIC4) != VALID_BASIC4)
265 return UWX_ERR_NOCONTEXT;
266
267 /* If we haven't already obtained the frame info for the */
268 /* current frame, get it now. */
269
270 if (env->rstate == 0) {
271 status = uwx_get_frame_info(env);
272 if (status != UWX_OK)
273 return status;
274 }
275
276 TRACE_S_STEP(env->rstate)
277
278 if (env->rstate[SBREG_PSP] != UWX_DISP_NONE) {
279 status = uwx_restore_reg(env, env->rstate[SBREG_PSP], &val, &hist);
280 if (status != UWX_OK)
281 return status;
282 env->context.special[UWX_REG_PSP] = val;
283 env->history.special[UWX_REG_PSP] = hist;
284 env->context.valid_regs |= 1 << UWX_REG_PSP;
285 TRACE_S_RESTORE_REG("PSP", env->rstate[SBREG_PSP], val)
286 }
287
288 if (env->rstate[SBREG_RP] != UWX_DISP_NONE) {
289 status = uwx_restore_reg(env, env->rstate[SBREG_RP], &val, &hist);
290 if (status != UWX_OK)
291 return status;
292 env->context.special[UWX_REG_RP] = val;
293 env->history.special[UWX_REG_RP] = hist;
294 env->context.valid_regs |= 1 << UWX_REG_RP;
295 TRACE_S_RESTORE_REG("RP", env->rstate[SBREG_RP], val)
296 }
297
298 if (env->rstate[SBREG_PFS] != UWX_DISP_NONE) {
299 status = uwx_restore_reg(env, env->rstate[SBREG_PFS], &val, &hist);
300 if (status != UWX_OK)
301 return status;
302 env->context.special[UWX_REG_PFS] = val;
303 env->history.special[UWX_REG_PFS] = hist;
304 env->context.valid_regs |= 1 << UWX_REG_PFS;
305 TRACE_S_RESTORE_REG("PFS", env->rstate[SBREG_PFS], val)
306 }
307
308 return UWX_OK;
309}
310
311/* uwx_get_module_info: Gets module name and text base for current frame */
312
313int uwx_get_module_info(
314 struct uwx_env *env,
315 char **modp,
316 uint64_t *text_base)
317{
318 int i;
319 int status;
320 int cbstatus;
321 uint64_t ip;
322 uint64_t *uvec;
323 uint64_t uvecout[UVECSIZE];
324
325 if (env == 0)
326 return UWX_ERR_NOENV;
327
328 /* If we haven't already obtained the frame info for the */
329 /* current frame, get it now. */
330
331 if (env->rstate == 0) {
332 status = uwx_get_frame_info(env);
333 if (status != UWX_OK)
334 return status;
335 }
336
337 /* Get the module name from the lookup IP callback. */
338 if (env->module_name == 0) {
339 ip = env->remapped_ip;
340 i = 0;
341 if (env->function_offset >= 0) {
342 uvecout[i++] = UWX_KEY_FUNCSTART;
343 uvecout[i++] = ip - env->function_offset;
344 }
345 uvecout[i++] = UWX_KEY_END;
346 uvecout[i++] = 0;
347 uvec = uvecout;
348 cbstatus = (*env->lookupip)(UWX_LKUP_MODULE, ip, env->cb_token, &uvec);
349
350 if (cbstatus == UWX_LKUP_SYMINFO) {
351 for (i = 0; uvec[i] != UWX_KEY_END; i += 2) {
352 switch ((int)uvec[i]) {
353 case UWX_KEY_TBASE:
354 env->text_base = uvec[i+1];
355 break;
356 case UWX_KEY_MODULE:
357 env->module_name =
358 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
359 break;
360 case UWX_KEY_FUNC:
361 env->function_name =
362 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
363 break;
364 case UWX_KEY_FUNCSTART:
365 env->function_offset = ip - uvec[i+1];
366 break;
367 }
368 }
369 (void) (*env->lookupip)(UWX_LKUP_FREE, 0, env->cb_token, &uvec);
370 }
371 }
372
373 *modp = env->module_name;
374 *text_base = env->text_base;
375
376 return UWX_OK;
377}
378
379/* uwx_get_funcstart: Gets start address of function from current frame */
380
381int uwx_get_funcstart(
382 struct uwx_env *env,
383 uint64_t *funcstart)
384{
385 int status;
386 uint64_t *uvec;
387 uint64_t uvecout[UVECSIZE];
388
389 if (env == 0)
390 return UWX_ERR_NOENV;
391
392 /* If we haven't already obtained the frame info for the */
393 /* current frame, get it now. */
394
395 if (env->rstate == 0) {
396 status = uwx_get_frame_info(env);
397 if (status != UWX_OK)
398 return status;
399 }
400
401 *funcstart = env->remapped_ip - env->function_offset;
402
403 return UWX_OK;
404}
405
406/* uwx_get_sym_info: Gets symbolic info from current frame */
407/* (Will make a UWX_LKUP_SYMBOLS callback if info */
408/* was not provided by UWX_LKUP_LOOKUP callback) */
409
410int uwx_get_sym_info(
411 struct uwx_env *env,
412 char **modp,
413 char **symp,
414 uint64_t *offsetp)
415{
416 int status;
417 int cbstatus;
418 uint64_t ip;
419 uint64_t *uvec;
420 uint64_t uvecout[UVECSIZE];
421 int i;
422
423 if (env == 0)
424 return UWX_ERR_NOENV;
425
426 /* If we haven't already obtained the frame info for the */
427 /* current frame, get it now. */
428
429 if (env->rstate == 0) {
430 status = uwx_get_frame_info(env);
431 if (status != UWX_OK)
432 return status;
433 }
434
435 /* Get the symbolic information from the lookup IP callback. */
436 if (env->function_name == 0) {
437 ip = env->remapped_ip;
438 i = 0;
439 if (env->function_offset >= 0) {
440 uvecout[i++] = UWX_KEY_FUNCSTART;
441 uvecout[i++] = ip - env->function_offset;
442 }
443 uvecout[i++] = UWX_KEY_END;
444 uvecout[i++] = 0;
445 uvec = uvecout;
446 cbstatus = (*env->lookupip)(UWX_LKUP_SYMBOLS, ip, env->cb_token, &uvec);
447
448 if (cbstatus == UWX_LKUP_SYMINFO) {
449 for (i = 0; uvec[i] != UWX_KEY_END; i += 2) {
450 switch ((int)uvec[i]) {
451 case UWX_KEY_MODULE:
452 env->module_name =
453 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
454 break;
455 case UWX_KEY_FUNC:
456 env->function_name =
457 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
458 break;
459 case UWX_KEY_FUNCSTART:
460 env->function_offset = ip - uvec[i+1];
461 break;
462 }
463 }
464 (void) (*env->lookupip)(UWX_LKUP_FREE, 0, env->cb_token, &uvec);
465 }
466 }
467
468 *modp = env->module_name;
469 *symp = env->function_name;
470 *offsetp = env->function_offset;
471
472 return UWX_OK;
473}
474
475
476/* uwx_step: Steps from the current frame to the previous frame */
477
478int uwx_step(struct uwx_env *env)
479{
480 int i;
481 int status;
482 int pfs_sol;
483 int dispcode;
484 uint64_t val;
485 uint64_t fval[2];
486 uint64_t hist;
487 uint64_t tempgr[NPRESERVEDGR];
488 int needpriunat;
489 int unat;
490 int tempnat;
491
492 if (env == 0)
493 return UWX_ERR_NOENV;
494
495 /* Complete the current context by restoring the current values */
496 /* of psp, rp, and pfs. */
497
498 if (env->rstate == 0 ||
499 (env->context.valid_regs & VALID_MARKERS) != VALID_MARKERS) {
500 status = uwx_restore_markers(env);
501 if (status != UWX_OK)
502 return status;
503 }
504
505 /* Check for bottom of stack (rp == 0). */
506
507 if (env->context.special[UWX_REG_RP] == 0)
508 return UWX_BOTTOM;
509
510 /* Find where the primary unat is saved, get a copy. */
511 /* Then, as we restore the GRs, we'll merge the NaT bits into the */
512 /* priunat register in the context. */
513 /* (Make sure we need it, though, before we try to get it, */
514 /* because the attempt to get it might invoke the copy-in callback. */
515 /* We don't need the priunat unless one of GR 4-7 was */
516 /* saved to the memory stack.) */
517
518 needpriunat = 0;
519 for (i = 0; i < NSB_GR; i++) {
520 dispcode = UWX_GET_DISP_CODE(env->rstate[SBREG_GR + i]);
521 if (dispcode == UWX_DISP_SPREL(0) || dispcode == UWX_DISP_PSPREL(0))
522 needpriunat = 1;
523 }
524 unat = 0;
525 if (needpriunat && env->rstate[SBREG_PRIUNAT] != UWX_DISP_NONE) {
526 status = uwx_restore_reg(env, env->rstate[SBREG_PRIUNAT], &val, &hist);
527 if (status != UWX_OK)
528 return status;
529 unat = (int) val;
530 env->history.special[UWX_REG_PRIUNAT] = hist;
531 TRACE_S_RESTORE_REG("PRIUNAT", env->rstate[SBREG_PRIUNAT], val)
532 }
533
534 /* Retrieve saved values of the preserved GRs into temporaries. */
535
536 tempnat = (int) env->context.special[UWX_REG_PRIUNAT];
537 for (i = 0; i < NSB_GR; i++) {
538 if (env->rstate[SBREG_GR + i] != UWX_DISP_NONE) {
539 status = uwx_restore_reg(env,
540 env->rstate[SBREG_GR + i], &val, &hist);
541 if (status != UWX_OK)
542 return status;
543 tempgr[i] = val;
544 if (uwx_restore_nat(env, env->rstate[SBREG_GR + i], unat))
545 tempnat |= 1 << i;
546 else
547 tempnat &= ~(1 << i);
548 env->history.gr[i] = hist;
549 env->context.valid_regs |= 1 << (i + VALID_GR_SHIFT);
550 TRACE_S_RESTORE_GR(i, env->rstate[SBREG_GR + i], val)
551 }
552 }
553
554 /* Now we have everything we need to step back to the previous frame. */
555
556 /* Restore preserved BRs. */
557
558 for (i = 0; i < NSB_BR; i++) {
559 if (env->rstate[SBREG_BR + i] != UWX_DISP_NONE) {
560 status = uwx_restore_reg(env,
561 env->rstate[SBREG_BR + i], &val, &hist);
562 if (status != UWX_OK)
563 return status;
564 env->context.br[i] = val;
565 env->history.br[i] = hist;
566 env->context.valid_regs |= 1 << (i + VALID_BR_SHIFT);
567 TRACE_S_RESTORE_BR(i, env->rstate[SBREG_BR + i], val)
568 }
569 }
570
571 /* Restore preserved FRs. */
572
573 if (env->nsbreg == NSBREG) {
574 for (i = 0; i < NSB_FR; i++) {
575 if (env->rstate[SBREG_FR + i] != UWX_DISP_NONE) {
576 status = uwx_restore_freg(env,
577 env->rstate[SBREG_FR + i], fval, &hist);
578 if (status != UWX_OK)
579 return status;
580 env->context.fr[i].part0 = fval[0];
581 env->context.fr[i].part1 = fval[1];
582 env->history.fr[i] = hist;
583 env->context.valid_frs |= 1 << i;
584 TRACE_S_RESTORE_FR(i, env->rstate[SBREG_FR + i], fval)
585 }
586 }
587 }
588
589 /* Restore other preserved regs. */
590
591 if (env->rstate[SBREG_PREDS] != UWX_DISP_NONE) {
592 status = uwx_restore_reg(env, env->rstate[SBREG_PREDS], &val, &hist);
593 if (status != UWX_OK)
594 return status;
595 env->context.special[UWX_REG_PREDS] = val;
596 env->history.special[UWX_REG_PREDS] = hist;
597 env->context.valid_regs |= 1 << UWX_REG_PREDS;
598 TRACE_S_RESTORE_REG("PREDS", env->rstate[SBREG_PREDS], val)
599 }
600 if (env->rstate[SBREG_RNAT] != UWX_DISP_NONE) {
601 status = uwx_restore_reg(env, env->rstate[SBREG_RNAT], &val, &hist);
602 if (status != UWX_OK)
603 return status;
604 env->context.special[UWX_REG_AR_RNAT] = val;
605 env->history.special[UWX_REG_AR_RNAT] = hist;
606 env->context.valid_regs |= 1 << UWX_REG_AR_RNAT;
607 TRACE_S_RESTORE_REG("RNAT", env->rstate[SBREG_RNAT], val)
608 }
609 if (env->rstate[SBREG_UNAT] != UWX_DISP_NONE) {
610 status = uwx_restore_reg(env, env->rstate[SBREG_UNAT], &val, &hist);
611 if (status != UWX_OK)
612 return status;
613 env->context.special[UWX_REG_AR_UNAT] = val;
614 env->history.special[UWX_REG_AR_UNAT] = hist;
615 env->context.valid_regs |= 1 << UWX_REG_AR_UNAT;
616 TRACE_S_RESTORE_REG("UNAT", env->rstate[SBREG_UNAT], val)
617 }
618 if (env->rstate[SBREG_FPSR] != UWX_DISP_NONE) {
619 status = uwx_restore_reg(env, env->rstate[SBREG_FPSR], &val, &hist);
620 if (status != UWX_OK)
621 return status;
622 env->context.special[UWX_REG_AR_FPSR] = val;
623 env->history.special[UWX_REG_AR_FPSR] = hist;
624 env->context.valid_regs |= 1 << UWX_REG_AR_FPSR;
625 TRACE_S_RESTORE_REG("FPSR", env->rstate[SBREG_FPSR], val)
626 }
627 if (env->rstate[SBREG_LC] != UWX_DISP_NONE) {
628 status = uwx_restore_reg(env, env->rstate[SBREG_LC], &val, &hist);
629 if (status != UWX_OK)
630 return status;
631 env->context.special[UWX_REG_AR_LC] = val;
632 env->history.special[UWX_REG_AR_LC] = hist;
633 env->context.valid_regs |= 1 << UWX_REG_AR_LC;
634 TRACE_S_RESTORE_REG("LC", env->rstate[SBREG_LC], val)
635 }
636
637 /* Restore preserved GRs from temporaries. */
638
639 for (i = 0; i < NSB_GR; i++) {
640 if (env->rstate[SBREG_GR + i] != UWX_DISP_NONE)
641 env->context.gr[i] = tempgr[i];
642 }
643 env->context.special[UWX_REG_PRIUNAT] = tempnat;
644
645 /* Restore the frame markers. */
646
647 env->context.special[UWX_REG_IP] = env->context.special[UWX_REG_RP];
648 env->history.special[UWX_REG_IP] = env->history.special[UWX_REG_RP];
649
650 env->context.special[UWX_REG_SP] = env->context.special[UWX_REG_PSP];
651 env->history.special[UWX_REG_SP] = env->history.special[UWX_REG_PSP];
652
653 pfs_sol = ((unsigned int)env->context.special[UWX_REG_PFS] >> 7) & 0x7f;
654 env->context.special[UWX_REG_BSP] = uwx_add_to_bsp(
655 env->context.special[UWX_REG_BSP],
656 -pfs_sol);
657
658 env->context.special[UWX_REG_CFM] = env->context.special[UWX_REG_PFS];
659 env->history.special[UWX_REG_CFM] = env->history.special[UWX_REG_PFS];
660
661 env->context.special[UWX_REG_RP] = 0;
662
663 /* The frame info for the new frame isn't yet available. */
664
665 env->rstate = 0;
666 env->context.valid_regs &= ~VALID_MARKERS;
667
668 return UWX_OK;
669}
670
671
672/* uwx_decode_uvec: Converts the update vector into a register state array */
673
674int uwx_decode_uvec(struct uwx_env *env, uint64_t *uvec, uint64_t **rstate)
675{
676 int i;
677 int status;
678
679 status = uwx_default_rstate(env, rstate);
680 if (status != UWX_OK)
681 return status;
682
683 for (i = 0; uvec[i] != UWX_KEY_END; i += 2) {
684 switch ((int)uvec[i]) {
685 case UWX_KEY_CONTEXT:
686 env->abi_context = (int)(uvec[i+1]);
687 status = UWX_ABI_FRAME;
688 break;
689 case UWX_KEY_GP:
690 uwx_set_reg(env, UWX_REG_GP, uvec[i+1]);
691 break;
692 case UWX_KEY_MODULE:
693 env->module_name =
694 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
695 break;
696 case UWX_KEY_FUNC:
697 env->function_name =
698 uwx_alloc_str(env, (char *)(intptr_t)(uvec[i+1]));
699 break;
700 case UWX_KEY_FUNCSTART:
701 env->function_offset = env->remapped_ip - uvec[i+1];
702 break;
703 default:
704 return UWX_ERR_CANTUNWIND;
705 }
706 }
707 return status;
708}
709
710
711/* uwx_restore_reg: Restores a register according to the scoreboard */
712
713#define COPYIN_MSTACK_8(dest, src) \
714 (env->remote? \
715 (*env->copyin)(UWX_COPYIN_MSTACK, (dest), (src), \
716 DWORDSZ, env->cb_token) : \
717 (*(uint64_t *)(intptr_t)(dest) = \
718 *(uint64_t *)(intptr_t)(src), DWORDSZ) )
719
720int uwx_restore_reg(struct uwx_env *env, uint64_t rstate,
721 uint64_t *valp, uint64_t *histp)
722{
723 int status;
724 uint64_t p;
725 int n;
726 int regid;
727
728 status = UWX_OK;
729
730 switch (UWX_GET_DISP_CODE(rstate)) {
731 case UWX_DISP_SPPLUS(0):
732 *valp = env->context.special[UWX_REG_SP] +
733 UWX_GET_DISP_OFFSET(rstate);
734 *histp = UWX_DISP_NONE;
735 break;
736 case UWX_DISP_SPREL(0):
737 p = env->context.special[UWX_REG_SP] +
738 UWX_GET_DISP_OFFSET(rstate);
739 n = COPYIN_MSTACK_8((char *)valp, p);
740 if (n != DWORDSZ)
741 status = UWX_ERR_COPYIN_MSTK;
742 *histp = UWX_DISP_MSTK(p);
743 break;
744 case UWX_DISP_PSPREL(0):
745 p = env->context.special[UWX_REG_PSP] + 16 -
746 UWX_GET_DISP_OFFSET(rstate);
747 n = COPYIN_MSTACK_8((char *)valp, p);
748 if (n != DWORDSZ)
749 status = UWX_ERR_COPYIN_MSTK;
750 *histp = UWX_DISP_MSTK(p);
751 break;
752 case UWX_DISP_REG(0):
753 regid = UWX_GET_DISP_REGID(rstate);
754 status = uwx_get_reg(env, regid, valp);
755 (void) uwx_get_spill_loc(env, regid, histp);
756 break;
757 }
758 return status;
759}
760
761#define COPYIN_MSTACK_16(dest, src) \
762 (env->remote? \
763 (*env->copyin)(UWX_COPYIN_MSTACK, (dest), (src), \
764 2*DWORDSZ, env->cb_token) : \
765 (*(uint64_t *)(intptr_t)(dest) = *(uint64_t *)(intptr_t)(src), \
766 *(uint64_t *)(intptr_t)((dest)+8) = \
767 *(uint64_t *)(intptr_t)((src)+8), \
768 2*DWORDSZ) )
769
770int uwx_restore_freg(struct uwx_env *env, uint64_t rstate,
771 uint64_t *valp, uint64_t *histp)
772{
773 int status;
774 uint64_t p;
775 int n;
776 int regid;
777
778 status = UWX_OK;
779
780 switch (UWX_GET_DISP_CODE(rstate)) {
781 case UWX_DISP_SPREL(0):
782 p = env->context.special[UWX_REG_SP] +
783 UWX_GET_DISP_OFFSET(rstate);
784 n = COPYIN_MSTACK_16((char *)valp, p);
785 if (n != 2*DWORDSZ)
786 status = UWX_ERR_COPYIN_MSTK;
787 *histp = UWX_DISP_MSTK(p);
788 break;
789 case UWX_DISP_PSPREL(0):
790 p = env->context.special[UWX_REG_PSP] + 16 -
791 UWX_GET_DISP_OFFSET(rstate);
792 n = COPYIN_MSTACK_16((char *)valp, p);
793 if (n != 2*DWORDSZ)
794 status = UWX_ERR_COPYIN_MSTK;
795 *histp = UWX_DISP_MSTK(p);
796 break;
797 case UWX_DISP_REG(0):
798 regid = UWX_GET_DISP_REGID(rstate);
799 status = uwx_get_reg(env, regid, valp);
800 (void) uwx_get_spill_loc(env, regid, histp);
801 break;
802 }
803 return status;
804}
805
806/* uwx_restore_nat: Returns the saved NaT bit for a preserved GR */
807
808int uwx_restore_nat(struct uwx_env *env, uint64_t rstate, int unat)
809{
810 int nat;
811 uint64_t p;
812
813 nat = 0;
814 switch (UWX_GET_DISP_CODE(rstate)) {
815 case UWX_DISP_SPREL(0):
816 p = env->context.special[UWX_REG_SP] +
817 UWX_GET_DISP_OFFSET(rstate);
818 nat = (unat >> (((int)p >> 3) & 0x3f)) & 0x01;
819 break;
820 case UWX_DISP_PSPREL(0):
821 p = env->context.special[UWX_REG_PSP] + 16 -
822 UWX_GET_DISP_OFFSET(rstate);
823 nat = (unat >> (((int)p >> 3) & 0x3f)) & 0x01;
824 break;
825 case UWX_DISP_REG(0):
826 (void) uwx_get_nat(env, UWX_GET_DISP_REGID(rstate), &nat);
827 break;
828 }
829 return nat;
830}
831