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1.1 root 1: /*
2: * Emulation of Linux signals
3: *
4: * Copyright (c) 2003 Fabrice Bellard
5: *
6: * This program is free software; you can redistribute it and/or modify
7: * it under the terms of the GNU General Public License as published by
8: * the Free Software Foundation; either version 2 of the License, or
9: * (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: * GNU General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License
17: * along with this program; if not, write to the Free Software
18: * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19: */
20: #include <stdlib.h>
21: #include <stdio.h>
22: #include <string.h>
23: #include <stdarg.h>
24: #include <unistd.h>
25: #include <signal.h>
26: #include <errno.h>
27: #include <sys/ucontext.h>
28:
29: #include "qemu.h"
30:
31: //#define DEBUG_SIGNAL
32:
33: #define MAX_SIGQUEUE_SIZE 1024
34:
35: struct sigqueue {
36: struct sigqueue *next;
37: target_siginfo_t info;
38: };
39:
40: struct emulated_sigaction {
41: struct target_sigaction sa;
42: int pending; /* true if signal is pending */
43: struct sigqueue *first;
44: struct sigqueue info; /* in order to always have memory for the
45: first signal, we put it here */
46: };
47:
48: static struct emulated_sigaction sigact_table[TARGET_NSIG];
49: static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
50: static struct sigqueue *first_free; /* first free siginfo queue entry */
51: static int signal_pending; /* non zero if a signal may be pending */
52:
53: static void host_signal_handler(int host_signum, siginfo_t *info,
54: void *puc);
55:
56: static uint8_t host_to_target_signal_table[65] = {
57: [SIGHUP] = TARGET_SIGHUP,
58: [SIGINT] = TARGET_SIGINT,
59: [SIGQUIT] = TARGET_SIGQUIT,
60: [SIGILL] = TARGET_SIGILL,
61: [SIGTRAP] = TARGET_SIGTRAP,
62: [SIGABRT] = TARGET_SIGABRT,
63: /* [SIGIOT] = TARGET_SIGIOT,*/
64: [SIGBUS] = TARGET_SIGBUS,
65: [SIGFPE] = TARGET_SIGFPE,
66: [SIGKILL] = TARGET_SIGKILL,
67: [SIGUSR1] = TARGET_SIGUSR1,
68: [SIGSEGV] = TARGET_SIGSEGV,
69: [SIGUSR2] = TARGET_SIGUSR2,
70: [SIGPIPE] = TARGET_SIGPIPE,
71: [SIGALRM] = TARGET_SIGALRM,
72: [SIGTERM] = TARGET_SIGTERM,
73: #ifdef SIGSTKFLT
74: [SIGSTKFLT] = TARGET_SIGSTKFLT,
75: #endif
76: [SIGCHLD] = TARGET_SIGCHLD,
77: [SIGCONT] = TARGET_SIGCONT,
78: [SIGSTOP] = TARGET_SIGSTOP,
79: [SIGTSTP] = TARGET_SIGTSTP,
80: [SIGTTIN] = TARGET_SIGTTIN,
81: [SIGTTOU] = TARGET_SIGTTOU,
82: [SIGURG] = TARGET_SIGURG,
83: [SIGXCPU] = TARGET_SIGXCPU,
84: [SIGXFSZ] = TARGET_SIGXFSZ,
85: [SIGVTALRM] = TARGET_SIGVTALRM,
86: [SIGPROF] = TARGET_SIGPROF,
87: [SIGWINCH] = TARGET_SIGWINCH,
88: [SIGIO] = TARGET_SIGIO,
89: [SIGPWR] = TARGET_SIGPWR,
90: [SIGSYS] = TARGET_SIGSYS,
91: /* next signals stay the same */
92: };
93: static uint8_t target_to_host_signal_table[65];
94:
95: static inline int host_to_target_signal(int sig)
96: {
97: return host_to_target_signal_table[sig];
98: }
99:
100: static inline int target_to_host_signal(int sig)
101: {
102: return target_to_host_signal_table[sig];
103: }
104:
105: static void host_to_target_sigset_internal(target_sigset_t *d,
106: const sigset_t *s)
107: {
108: int i;
109: unsigned long sigmask;
110: uint32_t target_sigmask;
111:
112: sigmask = ((unsigned long *)s)[0];
113: target_sigmask = 0;
114: for(i = 0; i < 32; i++) {
115: if (sigmask & (1 << i))
116: target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1);
117: }
118: #if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
119: d->sig[0] = target_sigmask;
120: for(i = 1;i < TARGET_NSIG_WORDS; i++) {
121: d->sig[i] = ((unsigned long *)s)[i];
122: }
123: #elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
124: d->sig[0] = target_sigmask;
125: d->sig[1] = sigmask >> 32;
126: #else
127: #warning host_to_target_sigset
128: #endif
129: }
130:
131: void host_to_target_sigset(target_sigset_t *d, const sigset_t *s)
132: {
133: target_sigset_t d1;
134: int i;
135:
136: host_to_target_sigset_internal(&d1, s);
137: for(i = 0;i < TARGET_NSIG_WORDS; i++)
1.1.1.3 root 138: d->sig[i] = tswapl(d1.sig[i]);
1.1 root 139: }
140:
141: void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s)
142: {
143: int i;
144: unsigned long sigmask;
145: target_ulong target_sigmask;
146:
147: target_sigmask = s->sig[0];
148: sigmask = 0;
149: for(i = 0; i < 32; i++) {
150: if (target_sigmask & (1 << i))
151: sigmask |= 1 << (target_to_host_signal(i + 1) - 1);
152: }
153: #if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
154: ((unsigned long *)d)[0] = sigmask;
155: for(i = 1;i < TARGET_NSIG_WORDS; i++) {
156: ((unsigned long *)d)[i] = s->sig[i];
157: }
158: #elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
159: ((unsigned long *)d)[0] = sigmask | ((unsigned long)(s->sig[1]) << 32);
160: #else
161: #warning target_to_host_sigset
162: #endif /* TARGET_LONG_BITS */
163: }
164:
165: void target_to_host_sigset(sigset_t *d, const target_sigset_t *s)
166: {
167: target_sigset_t s1;
168: int i;
169:
170: for(i = 0;i < TARGET_NSIG_WORDS; i++)
1.1.1.3 root 171: s1.sig[i] = tswapl(s->sig[i]);
1.1 root 172: target_to_host_sigset_internal(d, &s1);
173: }
174:
175: void host_to_target_old_sigset(target_ulong *old_sigset,
176: const sigset_t *sigset)
177: {
178: target_sigset_t d;
179: host_to_target_sigset(&d, sigset);
180: *old_sigset = d.sig[0];
181: }
182:
183: void target_to_host_old_sigset(sigset_t *sigset,
184: const target_ulong *old_sigset)
185: {
186: target_sigset_t d;
187: int i;
188:
189: d.sig[0] = *old_sigset;
190: for(i = 1;i < TARGET_NSIG_WORDS; i++)
191: d.sig[i] = 0;
192: target_to_host_sigset(sigset, &d);
193: }
194:
195: /* siginfo conversion */
196:
197: static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
198: const siginfo_t *info)
199: {
200: int sig;
201: sig = host_to_target_signal(info->si_signo);
202: tinfo->si_signo = sig;
203: tinfo->si_errno = 0;
204: tinfo->si_code = 0;
205: if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
206: sig == SIGBUS || sig == SIGTRAP) {
207: /* should never come here, but who knows. The information for
208: the target is irrelevant */
209: tinfo->_sifields._sigfault._addr = 0;
210: } else if (sig >= TARGET_SIGRTMIN) {
211: tinfo->_sifields._rt._pid = info->si_pid;
212: tinfo->_sifields._rt._uid = info->si_uid;
213: /* XXX: potential problem if 64 bit */
214: tinfo->_sifields._rt._sigval.sival_ptr =
215: (target_ulong)info->si_value.sival_ptr;
216: }
217: }
218:
219: static void tswap_siginfo(target_siginfo_t *tinfo,
220: const target_siginfo_t *info)
221: {
222: int sig;
223: sig = info->si_signo;
224: tinfo->si_signo = tswap32(sig);
225: tinfo->si_errno = tswap32(info->si_errno);
226: tinfo->si_code = tswap32(info->si_code);
227: if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
228: sig == SIGBUS || sig == SIGTRAP) {
229: tinfo->_sifields._sigfault._addr =
230: tswapl(info->_sifields._sigfault._addr);
231: } else if (sig >= TARGET_SIGRTMIN) {
232: tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
233: tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
234: tinfo->_sifields._rt._sigval.sival_ptr =
235: tswapl(info->_sifields._rt._sigval.sival_ptr);
236: }
237: }
238:
239:
240: void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
241: {
242: host_to_target_siginfo_noswap(tinfo, info);
243: tswap_siginfo(tinfo, tinfo);
244: }
245:
246: /* XXX: we support only POSIX RT signals are used. */
247: /* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
248: void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
249: {
250: info->si_signo = tswap32(tinfo->si_signo);
251: info->si_errno = tswap32(tinfo->si_errno);
252: info->si_code = tswap32(tinfo->si_code);
253: info->si_pid = tswap32(tinfo->_sifields._rt._pid);
254: info->si_uid = tswap32(tinfo->_sifields._rt._uid);
255: info->si_value.sival_ptr =
256: (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
257: }
258:
259: void signal_init(void)
260: {
261: struct sigaction act;
262: int i, j;
263:
264: /* generate signal conversion tables */
265: for(i = 1; i <= 64; i++) {
266: if (host_to_target_signal_table[i] == 0)
267: host_to_target_signal_table[i] = i;
268: }
269: for(i = 1; i <= 64; i++) {
270: j = host_to_target_signal_table[i];
271: target_to_host_signal_table[j] = i;
272: }
273:
274: /* set all host signal handlers. ALL signals are blocked during
275: the handlers to serialize them. */
276: sigfillset(&act.sa_mask);
277: act.sa_flags = SA_SIGINFO;
278: act.sa_sigaction = host_signal_handler;
279: for(i = 1; i < NSIG; i++) {
280: sigaction(i, &act, NULL);
281: }
282:
283: memset(sigact_table, 0, sizeof(sigact_table));
284:
285: first_free = &sigqueue_table[0];
286: for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
287: sigqueue_table[i].next = &sigqueue_table[i + 1];
288: sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
289: }
290:
291: /* signal queue handling */
292:
293: static inline struct sigqueue *alloc_sigqueue(void)
294: {
295: struct sigqueue *q = first_free;
296: if (!q)
297: return NULL;
298: first_free = q->next;
299: return q;
300: }
301:
302: static inline void free_sigqueue(struct sigqueue *q)
303: {
304: q->next = first_free;
305: first_free = q;
306: }
307:
308: /* abort execution with signal */
309: void __attribute((noreturn)) force_sig(int sig)
310: {
311: int host_sig;
312: host_sig = target_to_host_signal(sig);
313: fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
314: sig, strsignal(host_sig));
315: #if 1
316: _exit(-host_sig);
317: #else
318: {
319: struct sigaction act;
320: sigemptyset(&act.sa_mask);
321: act.sa_flags = SA_SIGINFO;
322: act.sa_sigaction = SIG_DFL;
323: sigaction(SIGABRT, &act, NULL);
324: abort();
325: }
326: #endif
327: }
328:
329: /* queue a signal so that it will be send to the virtual CPU as soon
330: as possible */
331: int queue_signal(int sig, target_siginfo_t *info)
332: {
333: struct emulated_sigaction *k;
334: struct sigqueue *q, **pq;
335: target_ulong handler;
336:
337: #if defined(DEBUG_SIGNAL)
338: fprintf(stderr, "queue_signal: sig=%d\n",
339: sig);
340: #endif
341: k = &sigact_table[sig - 1];
342: handler = k->sa._sa_handler;
343: if (handler == TARGET_SIG_DFL) {
344: /* default handler : ignore some signal. The other are fatal */
345: if (sig != TARGET_SIGCHLD &&
346: sig != TARGET_SIGURG &&
347: sig != TARGET_SIGWINCH) {
348: force_sig(sig);
349: } else {
350: return 0; /* indicate ignored */
351: }
352: } else if (handler == TARGET_SIG_IGN) {
353: /* ignore signal */
354: return 0;
355: } else if (handler == TARGET_SIG_ERR) {
356: force_sig(sig);
357: } else {
358: pq = &k->first;
359: if (sig < TARGET_SIGRTMIN) {
360: /* if non real time signal, we queue exactly one signal */
361: if (!k->pending)
362: q = &k->info;
363: else
364: return 0;
365: } else {
366: if (!k->pending) {
367: /* first signal */
368: q = &k->info;
369: } else {
370: q = alloc_sigqueue();
371: if (!q)
372: return -EAGAIN;
373: while (*pq != NULL)
374: pq = &(*pq)->next;
375: }
376: }
377: *pq = q;
378: q->info = *info;
379: q->next = NULL;
380: k->pending = 1;
381: /* signal that a new signal is pending */
382: signal_pending = 1;
383: return 1; /* indicates that the signal was queued */
384: }
385: }
386:
387: static void host_signal_handler(int host_signum, siginfo_t *info,
388: void *puc)
389: {
390: int sig;
391: target_siginfo_t tinfo;
392:
393: /* the CPU emulator uses some host signals to detect exceptions,
394: we we forward to it some signals */
395: if (host_signum == SIGSEGV || host_signum == SIGBUS
396: #if defined(TARGET_I386) && defined(USE_CODE_COPY)
397: || host_signum == SIGFPE
398: #endif
399: ) {
400: if (cpu_signal_handler(host_signum, info, puc))
401: return;
402: }
403:
404: /* get target signal number */
405: sig = host_to_target_signal(host_signum);
406: if (sig < 1 || sig > TARGET_NSIG)
407: return;
408: #if defined(DEBUG_SIGNAL)
409: fprintf(stderr, "qemu: got signal %d\n", sig);
410: #endif
411: host_to_target_siginfo_noswap(&tinfo, info);
412: if (queue_signal(sig, &tinfo) == 1) {
413: /* interrupt the virtual CPU as soon as possible */
414: cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
415: }
416: }
417:
418: int do_sigaction(int sig, const struct target_sigaction *act,
419: struct target_sigaction *oact)
420: {
421: struct emulated_sigaction *k;
422: struct sigaction act1;
423: int host_sig;
424:
425: if (sig < 1 || sig > TARGET_NSIG)
426: return -EINVAL;
427: k = &sigact_table[sig - 1];
428: #if defined(DEBUG_SIGNAL)
429: fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
430: sig, (int)act, (int)oact);
431: #endif
432: if (oact) {
433: oact->_sa_handler = tswapl(k->sa._sa_handler);
434: oact->sa_flags = tswapl(k->sa.sa_flags);
1.1.1.4 root 435: #if !defined(TARGET_MIPS)
436: oact->sa_restorer = tswapl(k->sa.sa_restorer);
437: #endif
1.1 root 438: oact->sa_mask = k->sa.sa_mask;
439: }
440: if (act) {
441: k->sa._sa_handler = tswapl(act->_sa_handler);
442: k->sa.sa_flags = tswapl(act->sa_flags);
1.1.1.4 root 443: #if !defined(TARGET_MIPS)
444: k->sa.sa_restorer = tswapl(act->sa_restorer);
445: #endif
1.1 root 446: k->sa.sa_mask = act->sa_mask;
447:
448: /* we update the host linux signal state */
449: host_sig = target_to_host_signal(sig);
450: if (host_sig != SIGSEGV && host_sig != SIGBUS) {
451: sigfillset(&act1.sa_mask);
452: act1.sa_flags = SA_SIGINFO;
453: if (k->sa.sa_flags & TARGET_SA_RESTART)
454: act1.sa_flags |= SA_RESTART;
455: /* NOTE: it is important to update the host kernel signal
456: ignore state to avoid getting unexpected interrupted
457: syscalls */
458: if (k->sa._sa_handler == TARGET_SIG_IGN) {
459: act1.sa_sigaction = (void *)SIG_IGN;
460: } else if (k->sa._sa_handler == TARGET_SIG_DFL) {
461: act1.sa_sigaction = (void *)SIG_DFL;
462: } else {
463: act1.sa_sigaction = host_signal_handler;
464: }
465: sigaction(host_sig, &act1, NULL);
466: }
467: }
468: return 0;
469: }
470:
471: #ifndef offsetof
472: #define offsetof(type, field) ((size_t) &((type *)0)->field)
473: #endif
474:
475: static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
476: const target_siginfo_t *info)
477: {
478: tswap_siginfo(tinfo, info);
479: return 0;
480: }
481:
482: #ifdef TARGET_I386
483:
484: /* from the Linux kernel */
485:
486: struct target_fpreg {
487: uint16_t significand[4];
488: uint16_t exponent;
489: };
490:
491: struct target_fpxreg {
492: uint16_t significand[4];
493: uint16_t exponent;
494: uint16_t padding[3];
495: };
496:
497: struct target_xmmreg {
498: target_ulong element[4];
499: };
500:
501: struct target_fpstate {
502: /* Regular FPU environment */
503: target_ulong cw;
504: target_ulong sw;
505: target_ulong tag;
506: target_ulong ipoff;
507: target_ulong cssel;
508: target_ulong dataoff;
509: target_ulong datasel;
510: struct target_fpreg _st[8];
511: uint16_t status;
512: uint16_t magic; /* 0xffff = regular FPU data only */
513:
514: /* FXSR FPU environment */
515: target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
516: target_ulong mxcsr;
517: target_ulong reserved;
518: struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
519: struct target_xmmreg _xmm[8];
520: target_ulong padding[56];
521: };
522:
523: #define X86_FXSR_MAGIC 0x0000
524:
525: struct target_sigcontext {
526: uint16_t gs, __gsh;
527: uint16_t fs, __fsh;
528: uint16_t es, __esh;
529: uint16_t ds, __dsh;
530: target_ulong edi;
531: target_ulong esi;
532: target_ulong ebp;
533: target_ulong esp;
534: target_ulong ebx;
535: target_ulong edx;
536: target_ulong ecx;
537: target_ulong eax;
538: target_ulong trapno;
539: target_ulong err;
540: target_ulong eip;
541: uint16_t cs, __csh;
542: target_ulong eflags;
543: target_ulong esp_at_signal;
544: uint16_t ss, __ssh;
545: target_ulong fpstate; /* pointer */
546: target_ulong oldmask;
547: target_ulong cr2;
548: };
549:
550: typedef struct target_sigaltstack {
551: target_ulong ss_sp;
552: int ss_flags;
553: target_ulong ss_size;
554: } target_stack_t;
555:
556: struct target_ucontext {
557: target_ulong tuc_flags;
558: target_ulong tuc_link;
559: target_stack_t tuc_stack;
560: struct target_sigcontext tuc_mcontext;
561: target_sigset_t tuc_sigmask; /* mask last for extensibility */
562: };
563:
564: struct sigframe
565: {
566: target_ulong pretcode;
567: int sig;
568: struct target_sigcontext sc;
569: struct target_fpstate fpstate;
570: target_ulong extramask[TARGET_NSIG_WORDS-1];
571: char retcode[8];
572: };
573:
574: struct rt_sigframe
575: {
576: target_ulong pretcode;
577: int sig;
578: target_ulong pinfo;
579: target_ulong puc;
580: struct target_siginfo info;
581: struct target_ucontext uc;
582: struct target_fpstate fpstate;
583: char retcode[8];
584: };
585:
586: /*
587: * Set up a signal frame.
588: */
589:
590: /* XXX: save x87 state */
591: static int
592: setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
593: CPUX86State *env, unsigned long mask)
594: {
595: int err = 0;
596:
597: err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
598: err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
599: err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
600: err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
601: err |= __put_user(env->regs[R_EDI], &sc->edi);
602: err |= __put_user(env->regs[R_ESI], &sc->esi);
603: err |= __put_user(env->regs[R_EBP], &sc->ebp);
604: err |= __put_user(env->regs[R_ESP], &sc->esp);
605: err |= __put_user(env->regs[R_EBX], &sc->ebx);
606: err |= __put_user(env->regs[R_EDX], &sc->edx);
607: err |= __put_user(env->regs[R_ECX], &sc->ecx);
608: err |= __put_user(env->regs[R_EAX], &sc->eax);
609: err |= __put_user(env->exception_index, &sc->trapno);
610: err |= __put_user(env->error_code, &sc->err);
611: err |= __put_user(env->eip, &sc->eip);
612: err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
613: err |= __put_user(env->eflags, &sc->eflags);
614: err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
615: err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
616:
617: cpu_x86_fsave(env, (void *)fpstate, 1);
618: fpstate->status = fpstate->sw;
619: err |= __put_user(0xffff, &fpstate->magic);
620: err |= __put_user(fpstate, &sc->fpstate);
621:
622: /* non-iBCS2 extensions.. */
623: err |= __put_user(mask, &sc->oldmask);
624: err |= __put_user(env->cr[2], &sc->cr2);
625: return err;
626: }
627:
628: /*
629: * Determine which stack to use..
630: */
631:
632: static inline void *
633: get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
634: {
635: unsigned long esp;
636:
637: /* Default to using normal stack */
638: esp = env->regs[R_ESP];
639: #if 0
640: /* This is the X/Open sanctioned signal stack switching. */
641: if (ka->sa.sa_flags & SA_ONSTACK) {
642: if (sas_ss_flags(esp) == 0)
643: esp = current->sas_ss_sp + current->sas_ss_size;
644: }
645:
646: /* This is the legacy signal stack switching. */
647: else
648: #endif
649: if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
650: !(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
651: ka->sa.sa_restorer) {
652: esp = (unsigned long) ka->sa.sa_restorer;
653: }
1.1.1.3 root 654: return g2h((esp - frame_size) & -8ul);
1.1 root 655: }
656:
657: static void setup_frame(int sig, struct emulated_sigaction *ka,
658: target_sigset_t *set, CPUX86State *env)
659: {
660: struct sigframe *frame;
661: int i, err = 0;
662:
663: frame = get_sigframe(ka, env, sizeof(*frame));
664:
665: if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
666: goto give_sigsegv;
667: err |= __put_user((/*current->exec_domain
668: && current->exec_domain->signal_invmap
669: && sig < 32
670: ? current->exec_domain->signal_invmap[sig]
671: : */ sig),
672: &frame->sig);
673: if (err)
674: goto give_sigsegv;
675:
676: setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
677: if (err)
678: goto give_sigsegv;
679:
680: for(i = 1; i < TARGET_NSIG_WORDS; i++) {
681: if (__put_user(set->sig[i], &frame->extramask[i - 1]))
682: goto give_sigsegv;
683: }
684:
685: /* Set up to return from userspace. If provided, use a stub
686: already in userspace. */
687: if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
688: err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
689: } else {
690: err |= __put_user(frame->retcode, &frame->pretcode);
691: /* This is popl %eax ; movl $,%eax ; int $0x80 */
692: err |= __put_user(0xb858, (short *)(frame->retcode+0));
693: err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
694: err |= __put_user(0x80cd, (short *)(frame->retcode+6));
695: }
696:
697: if (err)
698: goto give_sigsegv;
699:
700: /* Set up registers for signal handler */
1.1.1.3 root 701: env->regs[R_ESP] = h2g(frame);
1.1 root 702: env->eip = (unsigned long) ka->sa._sa_handler;
703:
704: cpu_x86_load_seg(env, R_DS, __USER_DS);
705: cpu_x86_load_seg(env, R_ES, __USER_DS);
706: cpu_x86_load_seg(env, R_SS, __USER_DS);
707: cpu_x86_load_seg(env, R_CS, __USER_CS);
708: env->eflags &= ~TF_MASK;
709:
710: return;
711:
712: give_sigsegv:
713: if (sig == TARGET_SIGSEGV)
714: ka->sa._sa_handler = TARGET_SIG_DFL;
715: force_sig(TARGET_SIGSEGV /* , current */);
716: }
717:
718: static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
719: target_siginfo_t *info,
720: target_sigset_t *set, CPUX86State *env)
721: {
722: struct rt_sigframe *frame;
723: int i, err = 0;
724:
725: frame = get_sigframe(ka, env, sizeof(*frame));
726:
727: if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
728: goto give_sigsegv;
729:
730: err |= __put_user((/*current->exec_domain
731: && current->exec_domain->signal_invmap
732: && sig < 32
733: ? current->exec_domain->signal_invmap[sig]
734: : */sig),
735: &frame->sig);
736: err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
737: err |= __put_user((target_ulong)&frame->uc, &frame->puc);
738: err |= copy_siginfo_to_user(&frame->info, info);
739: if (err)
740: goto give_sigsegv;
741:
742: /* Create the ucontext. */
743: err |= __put_user(0, &frame->uc.tuc_flags);
744: err |= __put_user(0, &frame->uc.tuc_link);
745: err |= __put_user(/*current->sas_ss_sp*/ 0,
746: &frame->uc.tuc_stack.ss_sp);
747: err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
748: &frame->uc.tuc_stack.ss_flags);
749: err |= __put_user(/* current->sas_ss_size */ 0,
750: &frame->uc.tuc_stack.ss_size);
751: err |= setup_sigcontext(&frame->uc.tuc_mcontext, &frame->fpstate,
752: env, set->sig[0]);
753: for(i = 0; i < TARGET_NSIG_WORDS; i++) {
754: if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
755: goto give_sigsegv;
756: }
757:
758: /* Set up to return from userspace. If provided, use a stub
759: already in userspace. */
760: if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
761: err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
762: } else {
763: err |= __put_user(frame->retcode, &frame->pretcode);
764: /* This is movl $,%eax ; int $0x80 */
765: err |= __put_user(0xb8, (char *)(frame->retcode+0));
766: err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
767: err |= __put_user(0x80cd, (short *)(frame->retcode+5));
768: }
769:
770: if (err)
771: goto give_sigsegv;
772:
773: /* Set up registers for signal handler */
774: env->regs[R_ESP] = (unsigned long) frame;
775: env->eip = (unsigned long) ka->sa._sa_handler;
776:
777: cpu_x86_load_seg(env, R_DS, __USER_DS);
778: cpu_x86_load_seg(env, R_ES, __USER_DS);
779: cpu_x86_load_seg(env, R_SS, __USER_DS);
780: cpu_x86_load_seg(env, R_CS, __USER_CS);
781: env->eflags &= ~TF_MASK;
782:
783: return;
784:
785: give_sigsegv:
786: if (sig == TARGET_SIGSEGV)
787: ka->sa._sa_handler = TARGET_SIG_DFL;
788: force_sig(TARGET_SIGSEGV /* , current */);
789: }
790:
791: static int
792: restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
793: {
794: unsigned int err = 0;
795:
796: cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
797: cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
798: cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
799: cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
800:
801: env->regs[R_EDI] = ldl(&sc->edi);
802: env->regs[R_ESI] = ldl(&sc->esi);
803: env->regs[R_EBP] = ldl(&sc->ebp);
804: env->regs[R_ESP] = ldl(&sc->esp);
805: env->regs[R_EBX] = ldl(&sc->ebx);
806: env->regs[R_EDX] = ldl(&sc->edx);
807: env->regs[R_ECX] = ldl(&sc->ecx);
808: env->eip = ldl(&sc->eip);
809:
810: cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
811: cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
812:
813: {
814: unsigned int tmpflags;
815: tmpflags = ldl(&sc->eflags);
816: env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
817: // regs->orig_eax = -1; /* disable syscall checks */
818: }
819:
820: {
821: struct _fpstate * buf;
822: buf = (void *)ldl(&sc->fpstate);
823: if (buf) {
824: #if 0
825: if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
826: goto badframe;
827: #endif
828: cpu_x86_frstor(env, (void *)buf, 1);
829: }
830: }
831:
832: *peax = ldl(&sc->eax);
833: return err;
834: #if 0
835: badframe:
836: return 1;
837: #endif
838: }
839:
840: long do_sigreturn(CPUX86State *env)
841: {
1.1.1.3 root 842: struct sigframe *frame = (struct sigframe *)g2h(env->regs[R_ESP] - 8);
1.1 root 843: target_sigset_t target_set;
844: sigset_t set;
845: int eax, i;
846:
847: #if defined(DEBUG_SIGNAL)
848: fprintf(stderr, "do_sigreturn\n");
849: #endif
850: /* set blocked signals */
851: if (__get_user(target_set.sig[0], &frame->sc.oldmask))
852: goto badframe;
853: for(i = 1; i < TARGET_NSIG_WORDS; i++) {
854: if (__get_user(target_set.sig[i], &frame->extramask[i - 1]))
855: goto badframe;
856: }
857:
858: target_to_host_sigset_internal(&set, &target_set);
859: sigprocmask(SIG_SETMASK, &set, NULL);
860:
861: /* restore registers */
862: if (restore_sigcontext(env, &frame->sc, &eax))
863: goto badframe;
864: return eax;
865:
866: badframe:
867: force_sig(TARGET_SIGSEGV);
868: return 0;
869: }
870:
871: long do_rt_sigreturn(CPUX86State *env)
872: {
1.1.1.3 root 873: struct rt_sigframe *frame = (struct rt_sigframe *)g2h(env->regs[R_ESP] - 4);
1.1 root 874: sigset_t set;
875: // stack_t st;
876: int eax;
877:
878: #if 0
879: if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
880: goto badframe;
881: #endif
882: target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
883: sigprocmask(SIG_SETMASK, &set, NULL);
884:
885: if (restore_sigcontext(env, &frame->uc.tuc_mcontext, &eax))
886: goto badframe;
887:
888: #if 0
889: if (__copy_from_user(&st, &frame->uc.tuc_stack, sizeof(st)))
890: goto badframe;
891: /* It is more difficult to avoid calling this function than to
892: call it and ignore errors. */
893: do_sigaltstack(&st, NULL, regs->esp);
894: #endif
895: return eax;
896:
897: badframe:
898: force_sig(TARGET_SIGSEGV);
899: return 0;
900: }
901:
902: #elif defined(TARGET_ARM)
903:
904: struct target_sigcontext {
905: target_ulong trap_no;
906: target_ulong error_code;
907: target_ulong oldmask;
908: target_ulong arm_r0;
909: target_ulong arm_r1;
910: target_ulong arm_r2;
911: target_ulong arm_r3;
912: target_ulong arm_r4;
913: target_ulong arm_r5;
914: target_ulong arm_r6;
915: target_ulong arm_r7;
916: target_ulong arm_r8;
917: target_ulong arm_r9;
918: target_ulong arm_r10;
919: target_ulong arm_fp;
920: target_ulong arm_ip;
921: target_ulong arm_sp;
922: target_ulong arm_lr;
923: target_ulong arm_pc;
924: target_ulong arm_cpsr;
925: target_ulong fault_address;
926: };
927:
928: typedef struct target_sigaltstack {
929: target_ulong ss_sp;
930: int ss_flags;
931: target_ulong ss_size;
932: } target_stack_t;
933:
934: struct target_ucontext {
935: target_ulong tuc_flags;
936: target_ulong tuc_link;
937: target_stack_t tuc_stack;
938: struct target_sigcontext tuc_mcontext;
939: target_sigset_t tuc_sigmask; /* mask last for extensibility */
940: };
941:
942: struct sigframe
943: {
944: struct target_sigcontext sc;
945: target_ulong extramask[TARGET_NSIG_WORDS-1];
946: target_ulong retcode;
947: };
948:
949: struct rt_sigframe
950: {
951: struct target_siginfo *pinfo;
952: void *puc;
953: struct target_siginfo info;
954: struct target_ucontext uc;
955: target_ulong retcode;
956: };
957:
958: #define TARGET_CONFIG_CPU_32 1
959:
960: /*
961: * For ARM syscalls, we encode the syscall number into the instruction.
962: */
963: #define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
964: #define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
965:
966: /*
967: * For Thumb syscalls, we pass the syscall number via r7. We therefore
968: * need two 16-bit instructions.
969: */
970: #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
971: #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
972:
973: static const target_ulong retcodes[4] = {
974: SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
975: SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
976: };
977:
978:
979: #define __put_user_error(x,p,e) __put_user(x, p)
980: #define __get_user_error(x,p,e) __get_user(x, p)
981:
982: static inline int valid_user_regs(CPUState *regs)
983: {
984: return 1;
985: }
986:
987: static int
988: setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
989: CPUState *env, unsigned long mask)
990: {
991: int err = 0;
992:
993: __put_user_error(env->regs[0], &sc->arm_r0, err);
994: __put_user_error(env->regs[1], &sc->arm_r1, err);
995: __put_user_error(env->regs[2], &sc->arm_r2, err);
996: __put_user_error(env->regs[3], &sc->arm_r3, err);
997: __put_user_error(env->regs[4], &sc->arm_r4, err);
998: __put_user_error(env->regs[5], &sc->arm_r5, err);
999: __put_user_error(env->regs[6], &sc->arm_r6, err);
1000: __put_user_error(env->regs[7], &sc->arm_r7, err);
1001: __put_user_error(env->regs[8], &sc->arm_r8, err);
1002: __put_user_error(env->regs[9], &sc->arm_r9, err);
1003: __put_user_error(env->regs[10], &sc->arm_r10, err);
1004: __put_user_error(env->regs[11], &sc->arm_fp, err);
1005: __put_user_error(env->regs[12], &sc->arm_ip, err);
1006: __put_user_error(env->regs[13], &sc->arm_sp, err);
1007: __put_user_error(env->regs[14], &sc->arm_lr, err);
1008: __put_user_error(env->regs[15], &sc->arm_pc, err);
1009: #ifdef TARGET_CONFIG_CPU_32
1.1.1.2 root 1010: __put_user_error(cpsr_read(env), &sc->arm_cpsr, err);
1.1 root 1011: #endif
1012:
1013: __put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err);
1014: __put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err);
1015: __put_user_error(/* current->thread.address */ 0, &sc->fault_address, err);
1016: __put_user_error(mask, &sc->oldmask, err);
1017:
1018: return err;
1019: }
1020:
1021: static inline void *
1022: get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
1023: {
1024: unsigned long sp = regs->regs[13];
1025:
1026: #if 0
1027: /*
1028: * This is the X/Open sanctioned signal stack switching.
1029: */
1030: if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
1031: sp = current->sas_ss_sp + current->sas_ss_size;
1032: #endif
1033: /*
1034: * ATPCS B01 mandates 8-byte alignment
1035: */
1.1.1.3 root 1036: return g2h((sp - framesize) & ~7);
1.1 root 1037: }
1038:
1039: static int
1040: setup_return(CPUState *env, struct emulated_sigaction *ka,
1041: target_ulong *rc, void *frame, int usig)
1042: {
1043: target_ulong handler = (target_ulong)ka->sa._sa_handler;
1044: target_ulong retcode;
1045: int thumb = 0;
1046: #if defined(TARGET_CONFIG_CPU_32)
1.1.1.2 root 1047: #if 0
1.1 root 1048: target_ulong cpsr = env->cpsr;
1049:
1050: /*
1051: * Maybe we need to deliver a 32-bit signal to a 26-bit task.
1052: */
1053: if (ka->sa.sa_flags & SA_THIRTYTWO)
1054: cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
1055:
1056: #ifdef CONFIG_ARM_THUMB
1057: if (elf_hwcap & HWCAP_THUMB) {
1058: /*
1059: * The LSB of the handler determines if we're going to
1060: * be using THUMB or ARM mode for this signal handler.
1061: */
1062: thumb = handler & 1;
1063:
1064: if (thumb)
1065: cpsr |= T_BIT;
1066: else
1067: cpsr &= ~T_BIT;
1068: }
1069: #endif
1070: #endif
1071: #endif /* TARGET_CONFIG_CPU_32 */
1072:
1073: if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
1074: retcode = (target_ulong)ka->sa.sa_restorer;
1075: } else {
1076: unsigned int idx = thumb;
1077:
1078: if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
1079: idx += 2;
1080:
1081: if (__put_user(retcodes[idx], rc))
1082: return 1;
1083: #if 0
1084: flush_icache_range((target_ulong)rc,
1085: (target_ulong)(rc + 1));
1086: #endif
1087: retcode = ((target_ulong)rc) + thumb;
1088: }
1089:
1090: env->regs[0] = usig;
1.1.1.3 root 1091: env->regs[13] = h2g(frame);
1.1 root 1092: env->regs[14] = retcode;
1093: env->regs[15] = handler & (thumb ? ~1 : ~3);
1094:
1.1.1.2 root 1095: #if 0
1.1 root 1096: #ifdef TARGET_CONFIG_CPU_32
1097: env->cpsr = cpsr;
1098: #endif
1.1.1.2 root 1099: #endif
1.1 root 1100:
1101: return 0;
1102: }
1103:
1104: static void setup_frame(int usig, struct emulated_sigaction *ka,
1105: target_sigset_t *set, CPUState *regs)
1106: {
1107: struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
1108: int i, err = 0;
1109:
1110: err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
1111:
1112: for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1113: if (__put_user(set->sig[i], &frame->extramask[i - 1]))
1114: return;
1115: }
1116:
1117: if (err == 0)
1118: err = setup_return(regs, ka, &frame->retcode, frame, usig);
1119: // return err;
1120: }
1121:
1122: static void setup_rt_frame(int usig, struct emulated_sigaction *ka,
1123: target_siginfo_t *info,
1124: target_sigset_t *set, CPUState *env)
1125: {
1126: struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame));
1127: int i, err = 0;
1128:
1129: if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
1130: return /* 1 */;
1131:
1132: __put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err);
1133: __put_user_error(&frame->uc, (target_ulong *)&frame->puc, err);
1134: err |= copy_siginfo_to_user(&frame->info, info);
1135:
1136: /* Clear all the bits of the ucontext we don't use. */
1.1.1.3 root 1137: memset(&frame->uc, 0, offsetof(struct target_ucontext, tuc_mcontext));
1.1 root 1138:
1139: err |= setup_sigcontext(&frame->uc.tuc_mcontext, /*&frame->fpstate,*/
1140: env, set->sig[0]);
1141: for(i = 0; i < TARGET_NSIG_WORDS; i++) {
1142: if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
1143: return;
1144: }
1145:
1146: if (err == 0)
1147: err = setup_return(env, ka, &frame->retcode, frame, usig);
1148:
1149: if (err == 0) {
1150: /*
1151: * For realtime signals we must also set the second and third
1152: * arguments for the signal handler.
1153: * -- Peter Maydell <[email protected]> 2000-12-06
1154: */
1155: env->regs[1] = (target_ulong)frame->pinfo;
1156: env->regs[2] = (target_ulong)frame->puc;
1157: }
1158:
1159: // return err;
1160: }
1161:
1162: static int
1163: restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
1164: {
1165: int err = 0;
1.1.1.2 root 1166: uint32_t cpsr;
1.1 root 1167:
1168: __get_user_error(env->regs[0], &sc->arm_r0, err);
1169: __get_user_error(env->regs[1], &sc->arm_r1, err);
1170: __get_user_error(env->regs[2], &sc->arm_r2, err);
1171: __get_user_error(env->regs[3], &sc->arm_r3, err);
1172: __get_user_error(env->regs[4], &sc->arm_r4, err);
1173: __get_user_error(env->regs[5], &sc->arm_r5, err);
1174: __get_user_error(env->regs[6], &sc->arm_r6, err);
1175: __get_user_error(env->regs[7], &sc->arm_r7, err);
1176: __get_user_error(env->regs[8], &sc->arm_r8, err);
1177: __get_user_error(env->regs[9], &sc->arm_r9, err);
1178: __get_user_error(env->regs[10], &sc->arm_r10, err);
1179: __get_user_error(env->regs[11], &sc->arm_fp, err);
1180: __get_user_error(env->regs[12], &sc->arm_ip, err);
1181: __get_user_error(env->regs[13], &sc->arm_sp, err);
1182: __get_user_error(env->regs[14], &sc->arm_lr, err);
1183: __get_user_error(env->regs[15], &sc->arm_pc, err);
1184: #ifdef TARGET_CONFIG_CPU_32
1.1.1.2 root 1185: __get_user_error(cpsr, &sc->arm_cpsr, err);
1186: cpsr_write(env, cpsr, 0xffffffff);
1.1 root 1187: #endif
1188:
1189: err |= !valid_user_regs(env);
1190:
1191: return err;
1192: }
1193:
1194: long do_sigreturn(CPUState *env)
1195: {
1196: struct sigframe *frame;
1197: target_sigset_t set;
1198: sigset_t host_set;
1199: int i;
1200:
1201: /*
1202: * Since we stacked the signal on a 64-bit boundary,
1203: * then 'sp' should be word aligned here. If it's
1204: * not, then the user is trying to mess with us.
1205: */
1206: if (env->regs[13] & 7)
1207: goto badframe;
1208:
1.1.1.3 root 1209: frame = (struct sigframe *)g2h(env->regs[13]);
1.1 root 1210:
1211: #if 0
1212: if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1213: goto badframe;
1214: #endif
1215: if (__get_user(set.sig[0], &frame->sc.oldmask))
1216: goto badframe;
1217: for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1218: if (__get_user(set.sig[i], &frame->extramask[i - 1]))
1219: goto badframe;
1220: }
1221:
1222: target_to_host_sigset_internal(&host_set, &set);
1223: sigprocmask(SIG_SETMASK, &host_set, NULL);
1224:
1225: if (restore_sigcontext(env, &frame->sc))
1226: goto badframe;
1227:
1228: #if 0
1229: /* Send SIGTRAP if we're single-stepping */
1230: if (ptrace_cancel_bpt(current))
1231: send_sig(SIGTRAP, current, 1);
1232: #endif
1233: return env->regs[0];
1234:
1235: badframe:
1236: force_sig(SIGSEGV /* , current */);
1237: return 0;
1238: }
1239:
1240: long do_rt_sigreturn(CPUState *env)
1241: {
1242: struct rt_sigframe *frame;
1243: sigset_t host_set;
1244:
1245: /*
1246: * Since we stacked the signal on a 64-bit boundary,
1247: * then 'sp' should be word aligned here. If it's
1248: * not, then the user is trying to mess with us.
1249: */
1250: if (env->regs[13] & 7)
1251: goto badframe;
1252:
1253: frame = (struct rt_sigframe *)env->regs[13];
1254:
1255: #if 0
1256: if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1257: goto badframe;
1258: #endif
1259: target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
1260: sigprocmask(SIG_SETMASK, &host_set, NULL);
1261:
1262: if (restore_sigcontext(env, &frame->uc.tuc_mcontext))
1263: goto badframe;
1264:
1265: #if 0
1266: /* Send SIGTRAP if we're single-stepping */
1267: if (ptrace_cancel_bpt(current))
1268: send_sig(SIGTRAP, current, 1);
1269: #endif
1270: return env->regs[0];
1271:
1272: badframe:
1273: force_sig(SIGSEGV /* , current */);
1274: return 0;
1275: }
1276:
1277: #elif defined(TARGET_SPARC)
1278:
1279: #define __SUNOS_MAXWIN 31
1280:
1281: /* This is what SunOS does, so shall I. */
1282: struct target_sigcontext {
1283: target_ulong sigc_onstack; /* state to restore */
1284:
1285: target_ulong sigc_mask; /* sigmask to restore */
1286: target_ulong sigc_sp; /* stack pointer */
1287: target_ulong sigc_pc; /* program counter */
1288: target_ulong sigc_npc; /* next program counter */
1289: target_ulong sigc_psr; /* for condition codes etc */
1290: target_ulong sigc_g1; /* User uses these two registers */
1291: target_ulong sigc_o0; /* within the trampoline code. */
1292:
1293: /* Now comes information regarding the users window set
1294: * at the time of the signal.
1295: */
1296: target_ulong sigc_oswins; /* outstanding windows */
1297:
1298: /* stack ptrs for each regwin buf */
1299: char *sigc_spbuf[__SUNOS_MAXWIN];
1300:
1301: /* Windows to restore after signal */
1302: struct {
1303: target_ulong locals[8];
1304: target_ulong ins[8];
1305: } sigc_wbuf[__SUNOS_MAXWIN];
1306: };
1307: /* A Sparc stack frame */
1308: struct sparc_stackf {
1309: target_ulong locals[8];
1310: target_ulong ins[6];
1311: struct sparc_stackf *fp;
1312: target_ulong callers_pc;
1313: char *structptr;
1314: target_ulong xargs[6];
1315: target_ulong xxargs[1];
1316: };
1317:
1318: typedef struct {
1319: struct {
1320: target_ulong psr;
1321: target_ulong pc;
1322: target_ulong npc;
1323: target_ulong y;
1324: target_ulong u_regs[16]; /* globals and ins */
1325: } si_regs;
1326: int si_mask;
1327: } __siginfo_t;
1328:
1329: typedef struct {
1330: unsigned long si_float_regs [32];
1331: unsigned long si_fsr;
1332: unsigned long si_fpqdepth;
1333: struct {
1334: unsigned long *insn_addr;
1335: unsigned long insn;
1336: } si_fpqueue [16];
1.1.1.4 root 1337: } qemu_siginfo_fpu_t;
1.1 root 1338:
1339:
1340: struct target_signal_frame {
1341: struct sparc_stackf ss;
1342: __siginfo_t info;
1.1.1.4 root 1343: qemu_siginfo_fpu_t *fpu_save;
1.1 root 1344: target_ulong insns[2] __attribute__ ((aligned (8)));
1345: target_ulong extramask[TARGET_NSIG_WORDS - 1];
1346: target_ulong extra_size; /* Should be 0 */
1.1.1.4 root 1347: qemu_siginfo_fpu_t fpu_state;
1.1 root 1348: };
1349: struct target_rt_signal_frame {
1350: struct sparc_stackf ss;
1351: siginfo_t info;
1352: target_ulong regs[20];
1353: sigset_t mask;
1.1.1.4 root 1354: qemu_siginfo_fpu_t *fpu_save;
1.1 root 1355: unsigned int insns[2];
1356: stack_t stack;
1357: unsigned int extra_size; /* Should be 0 */
1.1.1.4 root 1358: qemu_siginfo_fpu_t fpu_state;
1.1 root 1359: };
1360:
1361: #define UREG_O0 16
1362: #define UREG_O6 22
1363: #define UREG_I0 0
1364: #define UREG_I1 1
1365: #define UREG_I2 2
1366: #define UREG_I6 6
1367: #define UREG_I7 7
1368: #define UREG_L0 8
1369: #define UREG_FP UREG_I6
1370: #define UREG_SP UREG_O6
1371:
1372: static inline void *get_sigframe(struct emulated_sigaction *sa, CPUState *env, unsigned long framesize)
1373: {
1374: unsigned long sp;
1375:
1376: sp = env->regwptr[UREG_FP];
1377: #if 0
1378:
1379: /* This is the X/Open sanctioned signal stack switching. */
1380: if (sa->sa_flags & TARGET_SA_ONSTACK) {
1381: if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
1382: sp = current->sas_ss_sp + current->sas_ss_size;
1383: }
1384: #endif
1.1.1.3 root 1385: return g2h(sp - framesize);
1.1 root 1386: }
1387:
1388: static int
1389: setup___siginfo(__siginfo_t *si, CPUState *env, target_ulong mask)
1390: {
1391: int err = 0, i;
1392:
1393: err |= __put_user(env->psr, &si->si_regs.psr);
1394: err |= __put_user(env->pc, &si->si_regs.pc);
1395: err |= __put_user(env->npc, &si->si_regs.npc);
1396: err |= __put_user(env->y, &si->si_regs.y);
1397: for (i=0; i < 8; i++) {
1398: err |= __put_user(env->gregs[i], &si->si_regs.u_regs[i]);
1399: }
1400: for (i=0; i < 8; i++) {
1401: err |= __put_user(env->regwptr[UREG_I0 + i], &si->si_regs.u_regs[i+8]);
1402: }
1403: err |= __put_user(mask, &si->si_mask);
1404: return err;
1405: }
1406:
1407: #if 0
1408: static int
1409: setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
1410: CPUState *env, unsigned long mask)
1411: {
1412: int err = 0;
1413:
1414: err |= __put_user(mask, &sc->sigc_mask);
1415: err |= __put_user(env->regwptr[UREG_SP], &sc->sigc_sp);
1416: err |= __put_user(env->pc, &sc->sigc_pc);
1417: err |= __put_user(env->npc, &sc->sigc_npc);
1418: err |= __put_user(env->psr, &sc->sigc_psr);
1419: err |= __put_user(env->gregs[1], &sc->sigc_g1);
1420: err |= __put_user(env->regwptr[UREG_O0], &sc->sigc_o0);
1421:
1422: return err;
1423: }
1424: #endif
1425: #define NF_ALIGNEDSZ (((sizeof(struct target_signal_frame) + 7) & (~7)))
1426:
1427: static void setup_frame(int sig, struct emulated_sigaction *ka,
1428: target_sigset_t *set, CPUState *env)
1429: {
1430: struct target_signal_frame *sf;
1431: int sigframe_size, err, i;
1432:
1433: /* 1. Make sure everything is clean */
1434: //synchronize_user_stack();
1435:
1436: sigframe_size = NF_ALIGNEDSZ;
1437:
1438: sf = (struct target_signal_frame *)
1439: get_sigframe(ka, env, sigframe_size);
1440:
1441: //fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
1442: #if 0
1443: if (invalid_frame_pointer(sf, sigframe_size))
1444: goto sigill_and_return;
1445: #endif
1446: /* 2. Save the current process state */
1447: err = setup___siginfo(&sf->info, env, set->sig[0]);
1448: err |= __put_user(0, &sf->extra_size);
1449:
1450: //err |= save_fpu_state(regs, &sf->fpu_state);
1451: //err |= __put_user(&sf->fpu_state, &sf->fpu_save);
1452:
1453: err |= __put_user(set->sig[0], &sf->info.si_mask);
1454: for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
1455: err |= __put_user(set->sig[i + 1], &sf->extramask[i]);
1456: }
1457:
1458: for (i = 0; i < 8; i++) {
1459: err |= __put_user(env->regwptr[i + UREG_L0], &sf->ss.locals[i]);
1460: }
1461: for (i = 0; i < 8; i++) {
1462: err |= __put_user(env->regwptr[i + UREG_I0], &sf->ss.ins[i]);
1463: }
1464: if (err)
1465: goto sigsegv;
1466:
1467: /* 3. signal handler back-trampoline and parameters */
1.1.1.3 root 1468: env->regwptr[UREG_FP] = h2g(sf);
1.1 root 1469: env->regwptr[UREG_I0] = sig;
1.1.1.3 root 1470: env->regwptr[UREG_I1] = h2g(&sf->info);
1471: env->regwptr[UREG_I2] = h2g(&sf->info);
1.1 root 1472:
1473: /* 4. signal handler */
1474: env->pc = (unsigned long) ka->sa._sa_handler;
1475: env->npc = (env->pc + 4);
1476: /* 5. return to kernel instructions */
1477: if (ka->sa.sa_restorer)
1478: env->regwptr[UREG_I7] = (unsigned long)ka->sa.sa_restorer;
1479: else {
1.1.1.3 root 1480: env->regwptr[UREG_I7] = h2g(&(sf->insns[0]) - 2);
1.1 root 1481:
1482: /* mov __NR_sigreturn, %g1 */
1483: err |= __put_user(0x821020d8, &sf->insns[0]);
1484:
1485: /* t 0x10 */
1486: err |= __put_user(0x91d02010, &sf->insns[1]);
1487: if (err)
1488: goto sigsegv;
1489:
1490: /* Flush instruction space. */
1491: //flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
1492: // tb_flush(env);
1493: }
1494: return;
1495:
1496: //sigill_and_return:
1497: force_sig(TARGET_SIGILL);
1498: sigsegv:
1499: //fprintf(stderr, "force_sig\n");
1500: force_sig(TARGET_SIGSEGV);
1501: }
1502: static inline int
1.1.1.4 root 1503: restore_fpu_state(CPUState *env, qemu_siginfo_fpu_t *fpu)
1.1 root 1504: {
1505: int err;
1506: #if 0
1507: #ifdef CONFIG_SMP
1508: if (current->flags & PF_USEDFPU)
1509: regs->psr &= ~PSR_EF;
1510: #else
1511: if (current == last_task_used_math) {
1512: last_task_used_math = 0;
1513: regs->psr &= ~PSR_EF;
1514: }
1515: #endif
1516: current->used_math = 1;
1517: current->flags &= ~PF_USEDFPU;
1518: #endif
1519: #if 0
1520: if (verify_area (VERIFY_READ, fpu, sizeof(*fpu)))
1521: return -EFAULT;
1522: #endif
1523:
1.1.1.5 ! root 1524: #if 0
! 1525: /* XXX: incorrect */
1.1 root 1526: err = __copy_from_user(&env->fpr[0], &fpu->si_float_regs[0],
1527: (sizeof(unsigned long) * 32));
1.1.1.5 ! root 1528: #endif
1.1 root 1529: err |= __get_user(env->fsr, &fpu->si_fsr);
1530: #if 0
1531: err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
1532: if (current->thread.fpqdepth != 0)
1533: err |= __copy_from_user(¤t->thread.fpqueue[0],
1534: &fpu->si_fpqueue[0],
1535: ((sizeof(unsigned long) +
1536: (sizeof(unsigned long *)))*16));
1537: #endif
1538: return err;
1539: }
1540:
1541:
1542: static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1543: target_siginfo_t *info,
1544: target_sigset_t *set, CPUState *env)
1545: {
1546: fprintf(stderr, "setup_rt_frame: not implemented\n");
1547: }
1548:
1549: long do_sigreturn(CPUState *env)
1550: {
1551: struct target_signal_frame *sf;
1552: uint32_t up_psr, pc, npc;
1553: target_sigset_t set;
1554: sigset_t host_set;
1555: target_ulong fpu_save;
1556: int err, i;
1557:
1.1.1.3 root 1558: sf = (struct target_signal_frame *)g2h(env->regwptr[UREG_FP]);
1.1 root 1559: #if 0
1560: fprintf(stderr, "sigreturn\n");
1561: fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
1562: #endif
1563: //cpu_dump_state(env, stderr, fprintf, 0);
1564:
1565: /* 1. Make sure we are not getting garbage from the user */
1566: #if 0
1567: if (verify_area (VERIFY_READ, sf, sizeof (*sf)))
1568: goto segv_and_exit;
1569: #endif
1570:
1571: if (((uint) sf) & 3)
1572: goto segv_and_exit;
1573:
1574: err = __get_user(pc, &sf->info.si_regs.pc);
1575: err |= __get_user(npc, &sf->info.si_regs.npc);
1576:
1577: if ((pc | npc) & 3)
1578: goto segv_and_exit;
1579:
1580: /* 2. Restore the state */
1581: err |= __get_user(up_psr, &sf->info.si_regs.psr);
1582:
1583: /* User can only change condition codes and FPU enabling in %psr. */
1584: env->psr = (up_psr & (PSR_ICC /* | PSR_EF */))
1585: | (env->psr & ~(PSR_ICC /* | PSR_EF */));
1586:
1587: env->pc = pc;
1588: env->npc = npc;
1589: err |= __get_user(env->y, &sf->info.si_regs.y);
1590: for (i=0; i < 8; i++) {
1591: err |= __get_user(env->gregs[i], &sf->info.si_regs.u_regs[i]);
1592: }
1593: for (i=0; i < 8; i++) {
1594: err |= __get_user(env->regwptr[i + UREG_I0], &sf->info.si_regs.u_regs[i+8]);
1595: }
1596:
1597: err |= __get_user(fpu_save, (target_ulong *)&sf->fpu_save);
1598:
1599: //if (fpu_save)
1600: // err |= restore_fpu_state(env, fpu_save);
1601:
1602: /* This is pretty much atomic, no amount locking would prevent
1603: * the races which exist anyways.
1604: */
1605: err |= __get_user(set.sig[0], &sf->info.si_mask);
1606: for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1607: err |= (__get_user(set.sig[i], &sf->extramask[i - 1]));
1608: }
1609:
1610: target_to_host_sigset_internal(&host_set, &set);
1611: sigprocmask(SIG_SETMASK, &host_set, NULL);
1612:
1613: if (err)
1614: goto segv_and_exit;
1615:
1616: return env->regwptr[0];
1617:
1618: segv_and_exit:
1619: force_sig(TARGET_SIGSEGV);
1620: }
1621:
1622: long do_rt_sigreturn(CPUState *env)
1623: {
1624: fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1625: return -ENOSYS;
1626: }
1627:
1.1.1.4 root 1628: #elif defined(TARGET_MIPS)
1629:
1630: struct target_sigcontext {
1631: uint32_t sc_regmask; /* Unused */
1632: uint32_t sc_status;
1633: uint64_t sc_pc;
1634: uint64_t sc_regs[32];
1635: uint64_t sc_fpregs[32];
1636: uint32_t sc_ownedfp; /* Unused */
1637: uint32_t sc_fpc_csr;
1638: uint32_t sc_fpc_eir; /* Unused */
1639: uint32_t sc_used_math;
1640: uint32_t sc_dsp; /* dsp status, was sc_ssflags */
1641: uint64_t sc_mdhi;
1642: uint64_t sc_mdlo;
1643: target_ulong sc_hi1; /* Was sc_cause */
1644: target_ulong sc_lo1; /* Was sc_badvaddr */
1645: target_ulong sc_hi2; /* Was sc_sigset[4] */
1646: target_ulong sc_lo2;
1647: target_ulong sc_hi3;
1648: target_ulong sc_lo3;
1649: };
1650:
1651: struct sigframe {
1652: uint32_t sf_ass[4]; /* argument save space for o32 */
1653: uint32_t sf_code[2]; /* signal trampoline */
1654: struct target_sigcontext sf_sc;
1655: target_sigset_t sf_mask;
1656: };
1657:
1658: /* Install trampoline to jump back from signal handler */
1659: static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall)
1660: {
1661: int err;
1662:
1663: /*
1664: * Set up the return code ...
1665: *
1666: * li v0, __NR__foo_sigreturn
1667: * syscall
1668: */
1669:
1670: err = __put_user(0x24020000 + syscall, tramp + 0);
1671: err |= __put_user(0x0000000c , tramp + 1);
1672: /* flush_cache_sigtramp((unsigned long) tramp); */
1673: return err;
1674: }
1675:
1676: static inline int
1677: setup_sigcontext(CPUState *regs, struct target_sigcontext *sc)
1678: {
1679: int err = 0;
1680:
1681: err |= __put_user(regs->PC, &sc->sc_pc);
1682:
1683: #define save_gp_reg(i) do { \
1684: err |= __put_user(regs->gpr[i], &sc->sc_regs[i]); \
1685: } while(0)
1686: __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
1687: save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
1688: save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
1689: save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
1690: save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
1691: save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
1692: save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
1693: save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
1694: save_gp_reg(31);
1695: #undef save_gp_reg
1696:
1697: err |= __put_user(regs->HI, &sc->sc_mdhi);
1698: err |= __put_user(regs->LO, &sc->sc_mdlo);
1699:
1700: /* Not used yet, but might be useful if we ever have DSP suppport */
1701: #if 0
1702: if (cpu_has_dsp) {
1703: err |= __put_user(mfhi1(), &sc->sc_hi1);
1704: err |= __put_user(mflo1(), &sc->sc_lo1);
1705: err |= __put_user(mfhi2(), &sc->sc_hi2);
1706: err |= __put_user(mflo2(), &sc->sc_lo2);
1707: err |= __put_user(mfhi3(), &sc->sc_hi3);
1708: err |= __put_user(mflo3(), &sc->sc_lo3);
1709: err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
1710: }
1711: /* same with 64 bit */
1712: #ifdef CONFIG_64BIT
1713: err |= __put_user(regs->hi, &sc->sc_hi[0]);
1714: err |= __put_user(regs->lo, &sc->sc_lo[0]);
1715: if (cpu_has_dsp) {
1716: err |= __put_user(mfhi1(), &sc->sc_hi[1]);
1717: err |= __put_user(mflo1(), &sc->sc_lo[1]);
1718: err |= __put_user(mfhi2(), &sc->sc_hi[2]);
1719: err |= __put_user(mflo2(), &sc->sc_lo[2]);
1720: err |= __put_user(mfhi3(), &sc->sc_hi[3]);
1721: err |= __put_user(mflo3(), &sc->sc_lo[3]);
1722: err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
1723: }
1724: #endif
1725:
1726:
1727: #endif
1728:
1729:
1730: #if 0
1731: err |= __put_user(!!used_math(), &sc->sc_used_math);
1732:
1733: if (!used_math())
1734: goto out;
1735:
1736: /*
1737: * Save FPU state to signal context. Signal handler will "inherit"
1738: * current FPU state.
1739: */
1740: preempt_disable();
1741:
1742: if (!is_fpu_owner()) {
1743: own_fpu();
1744: restore_fp(current);
1745: }
1746: err |= save_fp_context(sc);
1747:
1748: preempt_enable();
1749: out:
1750: #endif
1751: return err;
1752: }
1753:
1754: static inline int
1755: restore_sigcontext(CPUState *regs, struct target_sigcontext *sc)
1756: {
1757: int err = 0;
1758:
1759: err |= __get_user(regs->CP0_EPC, &sc->sc_pc);
1760:
1761: err |= __get_user(regs->HI, &sc->sc_mdhi);
1762: err |= __get_user(regs->LO, &sc->sc_mdlo);
1763:
1764: #define restore_gp_reg(i) do { \
1765: err |= __get_user(regs->gpr[i], &sc->sc_regs[i]); \
1766: } while(0)
1767: restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
1768: restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
1769: restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
1770: restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
1771: restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
1772: restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
1773: restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
1774: restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
1775: restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
1776: restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
1777: restore_gp_reg(31);
1778: #undef restore_gp_reg
1779:
1780: #if 0
1781: if (cpu_has_dsp) {
1782: err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
1783: err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
1784: err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
1785: err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
1786: err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
1787: err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
1788: err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
1789: }
1790: #ifdef CONFIG_64BIT
1791: err |= __get_user(regs->hi, &sc->sc_hi[0]);
1792: err |= __get_user(regs->lo, &sc->sc_lo[0]);
1793: if (cpu_has_dsp) {
1794: err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
1795: err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
1796: err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
1797: err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
1798: err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
1799: err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
1800: err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
1801: }
1802: #endif
1803:
1804: err |= __get_user(used_math, &sc->sc_used_math);
1805: conditional_used_math(used_math);
1806:
1807: preempt_disable();
1808:
1809: if (used_math()) {
1810: /* restore fpu context if we have used it before */
1811: own_fpu();
1812: err |= restore_fp_context(sc);
1813: } else {
1814: /* signal handler may have used FPU. Give it up. */
1815: lose_fpu();
1816: }
1817:
1818: preempt_enable();
1819: #endif
1820: return err;
1821: }
1822: /*
1823: * Determine which stack to use..
1824: */
1825: static inline void *
1826: get_sigframe(struct emulated_sigaction *ka, CPUState *regs, size_t frame_size)
1827: {
1828: unsigned long sp;
1829:
1830: /* Default to using normal stack */
1831: sp = regs->gpr[29];
1832:
1833: /*
1834: * FPU emulator may have it's own trampoline active just
1835: * above the user stack, 16-bytes before the next lowest
1836: * 16 byte boundary. Try to avoid trashing it.
1837: */
1838: sp -= 32;
1839:
1840: #if 0
1841: /* This is the X/Open sanctioned signal stack switching. */
1842: if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
1843: sp = current->sas_ss_sp + current->sas_ss_size;
1844: #endif
1845:
1846: return g2h((sp - frame_size) & ~7);
1847: }
1848:
1849: static void setup_frame(int sig, struct emulated_sigaction * ka,
1850: target_sigset_t *set, CPUState *regs)
1851: {
1852: struct sigframe *frame;
1853: int i;
1854:
1855: frame = get_sigframe(ka, regs, sizeof(*frame));
1856: if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
1857: goto give_sigsegv;
1858:
1859: install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
1860:
1861: if(setup_sigcontext(regs, &frame->sf_sc))
1862: goto give_sigsegv;
1863:
1864: for(i = 0; i < TARGET_NSIG_WORDS; i++) {
1865: if(__put_user(set->sig[i], &frame->sf_mask.sig[i]))
1866: goto give_sigsegv;
1867: }
1868:
1869: /*
1870: * Arguments to signal handler:
1871: *
1872: * a0 = signal number
1873: * a1 = 0 (should be cause)
1874: * a2 = pointer to struct sigcontext
1875: *
1876: * $25 and PC point to the signal handler, $29 points to the
1877: * struct sigframe.
1878: */
1879: regs->gpr[ 4] = sig;
1880: regs->gpr[ 5] = 0;
1881: regs->gpr[ 6] = h2g(&frame->sf_sc);
1882: regs->gpr[29] = h2g(frame);
1883: regs->gpr[31] = h2g(frame->sf_code);
1884: /* The original kernel code sets CP0_EPC to the handler
1885: * since it returns to userland using eret
1886: * we cannot do this here, and we must set PC directly */
1887: regs->PC = regs->gpr[25] = ka->sa._sa_handler;
1888: return;
1889:
1890: give_sigsegv:
1891: force_sig(TARGET_SIGSEGV/*, current*/);
1892: return;
1893: }
1894:
1895: long do_sigreturn(CPUState *regs)
1896: {
1897: struct sigframe *frame;
1898: sigset_t blocked;
1899: target_sigset_t target_set;
1900: int i;
1901:
1902: #if defined(DEBUG_SIGNAL)
1903: fprintf(stderr, "do_sigreturn\n");
1904: #endif
1905: frame = (struct sigframe *) regs->gpr[29];
1906: if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
1907: goto badframe;
1908:
1909: for(i = 0; i < TARGET_NSIG_WORDS; i++) {
1910: if(__get_user(target_set.sig[i], &frame->sf_mask.sig[i]))
1911: goto badframe;
1912: }
1913:
1914: target_to_host_sigset_internal(&blocked, &target_set);
1915: sigprocmask(SIG_SETMASK, &blocked, NULL);
1916:
1917: if (restore_sigcontext(regs, &frame->sf_sc))
1918: goto badframe;
1919:
1920: #if 0
1921: /*
1922: * Don't let your children do this ...
1923: */
1924: __asm__ __volatile__(
1925: "move\t$29, %0\n\t"
1926: "j\tsyscall_exit"
1927: :/* no outputs */
1928: :"r" (®s));
1929: /* Unreached */
1930: #endif
1931:
1932: regs->PC = regs->CP0_EPC;
1933: /* I am not sure this is right, but it seems to work
1934: * maybe a problem with nested signals ? */
1935: regs->CP0_EPC = 0;
1936: return 0;
1937:
1938: badframe:
1939: force_sig(TARGET_SIGSEGV/*, current*/);
1940: return 0;
1941:
1942: }
1943:
1944: static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1945: target_siginfo_t *info,
1946: target_sigset_t *set, CPUState *env)
1947: {
1948: fprintf(stderr, "setup_rt_frame: not implemented\n");
1949: }
1950:
1951: long do_rt_sigreturn(CPUState *env)
1952: {
1953: fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1954: return -ENOSYS;
1955: }
1.1 root 1956:
1957: #else
1958:
1959: static void setup_frame(int sig, struct emulated_sigaction *ka,
1960: target_sigset_t *set, CPUState *env)
1961: {
1962: fprintf(stderr, "setup_frame: not implemented\n");
1963: }
1964:
1965: static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1966: target_siginfo_t *info,
1967: target_sigset_t *set, CPUState *env)
1968: {
1969: fprintf(stderr, "setup_rt_frame: not implemented\n");
1970: }
1971:
1972: long do_sigreturn(CPUState *env)
1973: {
1974: fprintf(stderr, "do_sigreturn: not implemented\n");
1975: return -ENOSYS;
1976: }
1977:
1978: long do_rt_sigreturn(CPUState *env)
1979: {
1980: fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1981: return -ENOSYS;
1982: }
1983:
1984: #endif
1985:
1986: void process_pending_signals(void *cpu_env)
1987: {
1988: int sig;
1989: target_ulong handler;
1990: sigset_t set, old_set;
1991: target_sigset_t target_old_set;
1992: struct emulated_sigaction *k;
1993: struct sigqueue *q;
1994:
1995: if (!signal_pending)
1996: return;
1997:
1998: k = sigact_table;
1999: for(sig = 1; sig <= TARGET_NSIG; sig++) {
2000: if (k->pending)
2001: goto handle_signal;
2002: k++;
2003: }
2004: /* if no signal is pending, just return */
2005: signal_pending = 0;
2006: return;
2007:
2008: handle_signal:
2009: #ifdef DEBUG_SIGNAL
2010: fprintf(stderr, "qemu: process signal %d\n", sig);
2011: #endif
2012: /* dequeue signal */
2013: q = k->first;
2014: k->first = q->next;
2015: if (!k->first)
2016: k->pending = 0;
2017:
2018: sig = gdb_handlesig (cpu_env, sig);
2019: if (!sig) {
2020: fprintf (stderr, "Lost signal\n");
2021: abort();
2022: }
2023:
2024: handler = k->sa._sa_handler;
2025: if (handler == TARGET_SIG_DFL) {
2026: /* default handler : ignore some signal. The other are fatal */
2027: if (sig != TARGET_SIGCHLD &&
2028: sig != TARGET_SIGURG &&
2029: sig != TARGET_SIGWINCH) {
2030: force_sig(sig);
2031: }
2032: } else if (handler == TARGET_SIG_IGN) {
2033: /* ignore sig */
2034: } else if (handler == TARGET_SIG_ERR) {
2035: force_sig(sig);
2036: } else {
2037: /* compute the blocked signals during the handler execution */
2038: target_to_host_sigset(&set, &k->sa.sa_mask);
2039: /* SA_NODEFER indicates that the current signal should not be
2040: blocked during the handler */
2041: if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
2042: sigaddset(&set, target_to_host_signal(sig));
2043:
2044: /* block signals in the handler using Linux */
2045: sigprocmask(SIG_BLOCK, &set, &old_set);
2046: /* save the previous blocked signal state to restore it at the
2047: end of the signal execution (see do_sigreturn) */
2048: host_to_target_sigset_internal(&target_old_set, &old_set);
2049:
2050: /* if the CPU is in VM86 mode, we restore the 32 bit values */
2051: #ifdef TARGET_I386
2052: {
2053: CPUX86State *env = cpu_env;
2054: if (env->eflags & VM_MASK)
2055: save_v86_state(env);
2056: }
2057: #endif
2058: /* prepare the stack frame of the virtual CPU */
2059: if (k->sa.sa_flags & TARGET_SA_SIGINFO)
2060: setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
2061: else
2062: setup_frame(sig, k, &target_old_set, cpu_env);
2063: if (k->sa.sa_flags & TARGET_SA_RESETHAND)
2064: k->sa._sa_handler = TARGET_SIG_DFL;
2065: }
2066: if (q != &k->info)
2067: free_sigqueue(q);
2068: }
2069:
2070:
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