xref: /qemu/linux-user/signal.c (revision ec6338bac30f982c16c23106edcf1ce4a04da575)
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 #include "target_signal.h"
31 
32 //#define DEBUG_SIGNAL
33 
34 #define MAX_SIGQUEUE_SIZE 1024
35 
36 struct sigqueue {
37     struct sigqueue *next;
38     target_siginfo_t info;
39 };
40 
41 struct emulated_sigaction {
42     struct target_sigaction sa;
43     int pending; /* true if signal is pending */
44     struct sigqueue *first;
45     struct sigqueue info; /* in order to always have memory for the
46                              first signal, we put it here */
47 };
48 
49 struct target_sigaltstack target_sigaltstack_used = {
50     .ss_sp = 0,
51     .ss_size = 0,
52     .ss_flags = TARGET_SS_DISABLE,
53 };
54 
55 static struct emulated_sigaction sigact_table[TARGET_NSIG];
56 static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
57 static struct sigqueue *first_free; /* first free siginfo queue entry */
58 static int signal_pending; /* non zero if a signal may be pending */
59 
60 static void host_signal_handler(int host_signum, siginfo_t *info,
61                                 void *puc);
62 
63 static uint8_t host_to_target_signal_table[65] = {
64     [SIGHUP] = TARGET_SIGHUP,
65     [SIGINT] = TARGET_SIGINT,
66     [SIGQUIT] = TARGET_SIGQUIT,
67     [SIGILL] = TARGET_SIGILL,
68     [SIGTRAP] = TARGET_SIGTRAP,
69     [SIGABRT] = TARGET_SIGABRT,
70 /*    [SIGIOT] = TARGET_SIGIOT,*/
71     [SIGBUS] = TARGET_SIGBUS,
72     [SIGFPE] = TARGET_SIGFPE,
73     [SIGKILL] = TARGET_SIGKILL,
74     [SIGUSR1] = TARGET_SIGUSR1,
75     [SIGSEGV] = TARGET_SIGSEGV,
76     [SIGUSR2] = TARGET_SIGUSR2,
77     [SIGPIPE] = TARGET_SIGPIPE,
78     [SIGALRM] = TARGET_SIGALRM,
79     [SIGTERM] = TARGET_SIGTERM,
80 #ifdef SIGSTKFLT
81     [SIGSTKFLT] = TARGET_SIGSTKFLT,
82 #endif
83     [SIGCHLD] = TARGET_SIGCHLD,
84     [SIGCONT] = TARGET_SIGCONT,
85     [SIGSTOP] = TARGET_SIGSTOP,
86     [SIGTSTP] = TARGET_SIGTSTP,
87     [SIGTTIN] = TARGET_SIGTTIN,
88     [SIGTTOU] = TARGET_SIGTTOU,
89     [SIGURG] = TARGET_SIGURG,
90     [SIGXCPU] = TARGET_SIGXCPU,
91     [SIGXFSZ] = TARGET_SIGXFSZ,
92     [SIGVTALRM] = TARGET_SIGVTALRM,
93     [SIGPROF] = TARGET_SIGPROF,
94     [SIGWINCH] = TARGET_SIGWINCH,
95     [SIGIO] = TARGET_SIGIO,
96     [SIGPWR] = TARGET_SIGPWR,
97     [SIGSYS] = TARGET_SIGSYS,
98     /* next signals stay the same */
99 };
100 static uint8_t target_to_host_signal_table[65];
101 
102 static inline int on_sig_stack(unsigned long sp)
103 {
104     return (sp - target_sigaltstack_used.ss_sp
105             < target_sigaltstack_used.ss_size);
106 }
107 
108 static inline int sas_ss_flags(unsigned long sp)
109 {
110     return (target_sigaltstack_used.ss_size == 0 ? SS_DISABLE
111             : on_sig_stack(sp) ? SS_ONSTACK : 0);
112 }
113 
114 static inline int host_to_target_signal(int sig)
115 {
116     return host_to_target_signal_table[sig];
117 }
118 
119 static inline int target_to_host_signal(int sig)
120 {
121     return target_to_host_signal_table[sig];
122 }
123 
124 static void host_to_target_sigset_internal(target_sigset_t *d,
125                                            const sigset_t *s)
126 {
127     int i;
128     unsigned long sigmask;
129     uint32_t target_sigmask;
130 
131     sigmask = ((unsigned long *)s)[0];
132     target_sigmask = 0;
133     for(i = 0; i < 32; i++) {
134         if (sigmask & (1 << i))
135             target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1);
136     }
137 #if TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 32
138     d->sig[0] = target_sigmask;
139     for(i = 1;i < TARGET_NSIG_WORDS; i++) {
140         d->sig[i] = ((unsigned long *)s)[i];
141     }
142 #elif TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
143     d->sig[0] = target_sigmask;
144     d->sig[1] = sigmask >> 32;
145 #else
146 #warning host_to_target_sigset
147 #endif
148 }
149 
150 void host_to_target_sigset(target_sigset_t *d, const sigset_t *s)
151 {
152     target_sigset_t d1;
153     int i;
154 
155     host_to_target_sigset_internal(&d1, s);
156     for(i = 0;i < TARGET_NSIG_WORDS; i++)
157         d->sig[i] = tswapl(d1.sig[i]);
158 }
159 
160 void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s)
161 {
162     int i;
163     unsigned long sigmask;
164     abi_ulong target_sigmask;
165 
166     target_sigmask = s->sig[0];
167     sigmask = 0;
168     for(i = 0; i < 32; i++) {
169         if (target_sigmask & (1 << i))
170             sigmask |= 1 << (target_to_host_signal(i + 1) - 1);
171     }
172 #if TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 32
173     ((unsigned long *)d)[0] = sigmask;
174     for(i = 1;i < TARGET_NSIG_WORDS; i++) {
175         ((unsigned long *)d)[i] = s->sig[i];
176     }
177 #elif TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
178     ((unsigned long *)d)[0] = sigmask | ((unsigned long)(s->sig[1]) << 32);
179 #else
180 #warning target_to_host_sigset
181 #endif /* TARGET_ABI_BITS */
182 }
183 
184 void target_to_host_sigset(sigset_t *d, const target_sigset_t *s)
185 {
186     target_sigset_t s1;
187     int i;
188 
189     for(i = 0;i < TARGET_NSIG_WORDS; i++)
190         s1.sig[i] = tswapl(s->sig[i]);
191     target_to_host_sigset_internal(d, &s1);
192 }
193 
194 void host_to_target_old_sigset(abi_ulong *old_sigset,
195                                const sigset_t *sigset)
196 {
197     target_sigset_t d;
198     host_to_target_sigset(&d, sigset);
199     *old_sigset = d.sig[0];
200 }
201 
202 void target_to_host_old_sigset(sigset_t *sigset,
203                                const abi_ulong *old_sigset)
204 {
205     target_sigset_t d;
206     int i;
207 
208     d.sig[0] = *old_sigset;
209     for(i = 1;i < TARGET_NSIG_WORDS; i++)
210         d.sig[i] = 0;
211     target_to_host_sigset(sigset, &d);
212 }
213 
214 /* siginfo conversion */
215 
216 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
217                                                  const siginfo_t *info)
218 {
219     int sig;
220     sig = host_to_target_signal(info->si_signo);
221     tinfo->si_signo = sig;
222     tinfo->si_errno = 0;
223     tinfo->si_code = 0;
224     if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
225         sig == SIGBUS || sig == SIGTRAP) {
226         /* should never come here, but who knows. The information for
227            the target is irrelevant */
228         tinfo->_sifields._sigfault._addr = 0;
229     } else if (sig == SIGIO) {
230 	tinfo->_sifields._sigpoll._fd = info->si_fd;
231     } else if (sig >= TARGET_SIGRTMIN) {
232         tinfo->_sifields._rt._pid = info->si_pid;
233         tinfo->_sifields._rt._uid = info->si_uid;
234         /* XXX: potential problem if 64 bit */
235         tinfo->_sifields._rt._sigval.sival_ptr =
236             (abi_ulong)info->si_value.sival_ptr;
237     }
238 }
239 
240 static void tswap_siginfo(target_siginfo_t *tinfo,
241                           const target_siginfo_t *info)
242 {
243     int sig;
244     sig = info->si_signo;
245     tinfo->si_signo = tswap32(sig);
246     tinfo->si_errno = tswap32(info->si_errno);
247     tinfo->si_code = tswap32(info->si_code);
248     if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
249         sig == SIGBUS || sig == SIGTRAP) {
250         tinfo->_sifields._sigfault._addr =
251             tswapl(info->_sifields._sigfault._addr);
252     } else if (sig == SIGIO) {
253 	tinfo->_sifields._sigpoll._fd = tswap32(info->_sifields._sigpoll._fd);
254     } else if (sig >= TARGET_SIGRTMIN) {
255         tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
256         tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
257         tinfo->_sifields._rt._sigval.sival_ptr =
258             tswapl(info->_sifields._rt._sigval.sival_ptr);
259     }
260 }
261 
262 
263 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
264 {
265     host_to_target_siginfo_noswap(tinfo, info);
266     tswap_siginfo(tinfo, tinfo);
267 }
268 
269 /* XXX: we support only POSIX RT signals are used. */
270 /* XXX: find a solution for 64 bit (additional malloced data is needed) */
271 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
272 {
273     info->si_signo = tswap32(tinfo->si_signo);
274     info->si_errno = tswap32(tinfo->si_errno);
275     info->si_code = tswap32(tinfo->si_code);
276     info->si_pid = tswap32(tinfo->_sifields._rt._pid);
277     info->si_uid = tswap32(tinfo->_sifields._rt._uid);
278     info->si_value.sival_ptr =
279         (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
280 }
281 
282 void signal_init(void)
283 {
284     struct sigaction act;
285     int i, j;
286 
287     /* generate signal conversion tables */
288     for(i = 1; i <= 64; i++) {
289         if (host_to_target_signal_table[i] == 0)
290             host_to_target_signal_table[i] = i;
291     }
292     for(i = 1; i <= 64; i++) {
293         j = host_to_target_signal_table[i];
294         target_to_host_signal_table[j] = i;
295     }
296 
297     /* set all host signal handlers. ALL signals are blocked during
298        the handlers to serialize them. */
299     sigfillset(&act.sa_mask);
300     act.sa_flags = SA_SIGINFO;
301     act.sa_sigaction = host_signal_handler;
302     for(i = 1; i < NSIG; i++) {
303         sigaction(i, &act, NULL);
304     }
305 
306     memset(sigact_table, 0, sizeof(sigact_table));
307 
308     first_free = &sigqueue_table[0];
309     for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
310         sigqueue_table[i].next = &sigqueue_table[i + 1];
311     sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
312 }
313 
314 /* signal queue handling */
315 
316 static inline struct sigqueue *alloc_sigqueue(void)
317 {
318     struct sigqueue *q = first_free;
319     if (!q)
320         return NULL;
321     first_free = q->next;
322     return q;
323 }
324 
325 static inline void free_sigqueue(struct sigqueue *q)
326 {
327     q->next = first_free;
328     first_free = q;
329 }
330 
331 /* abort execution with signal */
332 void __attribute((noreturn)) force_sig(int sig)
333 {
334     int host_sig;
335     host_sig = target_to_host_signal(sig);
336     fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
337             sig, strsignal(host_sig));
338 #if 1
339     _exit(-host_sig);
340 #else
341     {
342         struct sigaction act;
343         sigemptyset(&act.sa_mask);
344         act.sa_flags = SA_SIGINFO;
345         act.sa_sigaction = SIG_DFL;
346         sigaction(SIGABRT, &act, NULL);
347         abort();
348     }
349 #endif
350 }
351 
352 /* queue a signal so that it will be send to the virtual CPU as soon
353    as possible */
354 int queue_signal(int sig, target_siginfo_t *info)
355 {
356     struct emulated_sigaction *k;
357     struct sigqueue *q, **pq;
358     abi_ulong handler;
359 
360 #if defined(DEBUG_SIGNAL)
361     fprintf(stderr, "queue_signal: sig=%d\n",
362             sig);
363 #endif
364     k = &sigact_table[sig - 1];
365     handler = k->sa._sa_handler;
366     if (handler == TARGET_SIG_DFL) {
367         /* default handler : ignore some signal. The other are fatal */
368         if (sig != TARGET_SIGCHLD &&
369             sig != TARGET_SIGURG &&
370             sig != TARGET_SIGWINCH) {
371             force_sig(sig);
372         } else {
373             return 0; /* indicate ignored */
374         }
375     } else if (handler == TARGET_SIG_IGN) {
376         /* ignore signal */
377         return 0;
378     } else if (handler == TARGET_SIG_ERR) {
379         force_sig(sig);
380     } else {
381         pq = &k->first;
382         if (sig < TARGET_SIGRTMIN) {
383             /* if non real time signal, we queue exactly one signal */
384             if (!k->pending)
385                 q = &k->info;
386             else
387                 return 0;
388         } else {
389             if (!k->pending) {
390                 /* first signal */
391                 q = &k->info;
392             } else {
393                 q = alloc_sigqueue();
394                 if (!q)
395                     return -EAGAIN;
396                 while (*pq != NULL)
397                     pq = &(*pq)->next;
398             }
399         }
400         *pq = q;
401         q->info = *info;
402         q->next = NULL;
403         k->pending = 1;
404         /* signal that a new signal is pending */
405         signal_pending = 1;
406         return 1; /* indicates that the signal was queued */
407     }
408 }
409 
410 static void host_signal_handler(int host_signum, siginfo_t *info,
411                                 void *puc)
412 {
413     int sig;
414     target_siginfo_t tinfo;
415 
416     /* the CPU emulator uses some host signals to detect exceptions,
417        we we forward to it some signals */
418     if (host_signum == SIGSEGV || host_signum == SIGBUS) {
419         if (cpu_signal_handler(host_signum, info, puc))
420             return;
421     }
422 
423     /* get target signal number */
424     sig = host_to_target_signal(host_signum);
425     if (sig < 1 || sig > TARGET_NSIG)
426         return;
427 #if defined(DEBUG_SIGNAL)
428     fprintf(stderr, "qemu: got signal %d\n", sig);
429 #endif
430     host_to_target_siginfo_noswap(&tinfo, info);
431     if (queue_signal(sig, &tinfo) == 1) {
432         /* interrupt the virtual CPU as soon as possible */
433         cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
434     }
435 }
436 
437 /* do_sigaltstack() returns target values and errnos. */
438 int do_sigaltstack(const struct target_sigaltstack *uss,
439                    struct target_sigaltstack *uoss,
440                    abi_ulong sp)
441 {
442     int ret;
443     struct target_sigaltstack oss;
444 
445     /* XXX: test errors */
446     if(uoss)
447     {
448         __put_user(target_sigaltstack_used.ss_sp, &oss.ss_sp);
449         __put_user(target_sigaltstack_used.ss_size, &oss.ss_size);
450         __put_user(sas_ss_flags(sp), &oss.ss_flags);
451     }
452 
453     if(uss)
454     {
455 	struct target_sigaltstack ss;
456 
457 	ret = -TARGET_EFAULT;
458 	if (!access_ok(VERIFY_READ, uss, sizeof(*uss))
459 	    || __get_user(ss.ss_sp, &uss->ss_sp)
460 	    || __get_user(ss.ss_size, &uss->ss_size)
461 	    || __get_user(ss.ss_flags, &uss->ss_flags))
462             goto out;
463 
464 	ret = -TARGET_EPERM;
465 	if (on_sig_stack(sp))
466             goto out;
467 
468 	ret = -TARGET_EINVAL;
469 	if (ss.ss_flags != TARGET_SS_DISABLE
470             && ss.ss_flags != TARGET_SS_ONSTACK
471             && ss.ss_flags != 0)
472             goto out;
473 
474 	if (ss.ss_flags == TARGET_SS_DISABLE) {
475             ss.ss_size = 0;
476             ss.ss_sp = 0;
477 	} else {
478             ret = -TARGET_ENOMEM;
479             if (ss.ss_size < MINSIGSTKSZ)
480                 goto out;
481 	}
482 
483         target_sigaltstack_used.ss_sp = ss.ss_sp;
484         target_sigaltstack_used.ss_size = ss.ss_size;
485     }
486 
487     if (uoss) {
488         ret = -TARGET_EFAULT;
489         if (!access_ok(VERIFY_WRITE, uoss, sizeof(oss)))
490             goto out;
491         memcpy(uoss, &oss, sizeof(oss));
492     }
493 
494     ret = 0;
495 out:
496     return ret;
497 }
498 
499 /* do_sigaction() return host values and errnos */
500 int do_sigaction(int sig, const struct target_sigaction *act,
501                  struct target_sigaction *oact)
502 {
503     struct emulated_sigaction *k;
504     struct sigaction act1;
505     int host_sig;
506     int ret = 0;
507 
508     if (sig < 1 || sig > TARGET_NSIG || sig == SIGKILL || sig == SIGSTOP)
509         return -EINVAL;
510     k = &sigact_table[sig - 1];
511 #if defined(DEBUG_SIGNAL)
512     fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
513             sig, (int)act, (int)oact);
514 #endif
515     if (oact) {
516         oact->_sa_handler = tswapl(k->sa._sa_handler);
517         oact->sa_flags = tswapl(k->sa.sa_flags);
518 #if !defined(TARGET_MIPS)
519         oact->sa_restorer = tswapl(k->sa.sa_restorer);
520 #endif
521         oact->sa_mask = k->sa.sa_mask;
522     }
523     if (act) {
524         k->sa._sa_handler = tswapl(act->_sa_handler);
525         k->sa.sa_flags = tswapl(act->sa_flags);
526 #if !defined(TARGET_MIPS)
527         k->sa.sa_restorer = tswapl(act->sa_restorer);
528 #endif
529         k->sa.sa_mask = act->sa_mask;
530 
531         /* we update the host linux signal state */
532         host_sig = target_to_host_signal(sig);
533         if (host_sig != SIGSEGV && host_sig != SIGBUS) {
534             sigfillset(&act1.sa_mask);
535             act1.sa_flags = SA_SIGINFO;
536             if (k->sa.sa_flags & TARGET_SA_RESTART)
537                 act1.sa_flags |= SA_RESTART;
538             /* NOTE: it is important to update the host kernel signal
539                ignore state to avoid getting unexpected interrupted
540                syscalls */
541             if (k->sa._sa_handler == TARGET_SIG_IGN) {
542                 act1.sa_sigaction = (void *)SIG_IGN;
543             } else if (k->sa._sa_handler == TARGET_SIG_DFL) {
544                 act1.sa_sigaction = (void *)SIG_DFL;
545             } else {
546                 act1.sa_sigaction = host_signal_handler;
547             }
548             ret = sigaction(host_sig, &act1, NULL);
549         }
550     }
551     return ret;
552 }
553 
554 #ifndef offsetof
555 #define offsetof(type, field) ((size_t) &((type *)0)->field)
556 #endif
557 
558 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
559                                        const target_siginfo_t *info)
560 {
561     tswap_siginfo(tinfo, info);
562     return 0;
563 }
564 
565 #ifdef TARGET_I386
566 
567 /* from the Linux kernel */
568 
569 struct target_fpreg {
570 	uint16_t significand[4];
571 	uint16_t exponent;
572 };
573 
574 struct target_fpxreg {
575 	uint16_t significand[4];
576 	uint16_t exponent;
577 	uint16_t padding[3];
578 };
579 
580 struct target_xmmreg {
581 	abi_ulong element[4];
582 };
583 
584 struct target_fpstate {
585 	/* Regular FPU environment */
586         abi_ulong       cw;
587         abi_ulong       sw;
588         abi_ulong       tag;
589         abi_ulong       ipoff;
590         abi_ulong       cssel;
591         abi_ulong       dataoff;
592         abi_ulong       datasel;
593 	struct target_fpreg	_st[8];
594 	uint16_t	status;
595 	uint16_t	magic;		/* 0xffff = regular FPU data only */
596 
597 	/* FXSR FPU environment */
598         abi_ulong       _fxsr_env[6];   /* FXSR FPU env is ignored */
599         abi_ulong       mxcsr;
600         abi_ulong       reserved;
601 	struct target_fpxreg	_fxsr_st[8];	/* FXSR FPU reg data is ignored */
602 	struct target_xmmreg	_xmm[8];
603         abi_ulong       padding[56];
604 };
605 
606 #define X86_FXSR_MAGIC		0x0000
607 
608 struct target_sigcontext {
609 	uint16_t gs, __gsh;
610 	uint16_t fs, __fsh;
611 	uint16_t es, __esh;
612 	uint16_t ds, __dsh;
613         abi_ulong edi;
614         abi_ulong esi;
615         abi_ulong ebp;
616         abi_ulong esp;
617         abi_ulong ebx;
618         abi_ulong edx;
619         abi_ulong ecx;
620         abi_ulong eax;
621         abi_ulong trapno;
622         abi_ulong err;
623         abi_ulong eip;
624 	uint16_t cs, __csh;
625         abi_ulong eflags;
626         abi_ulong esp_at_signal;
627 	uint16_t ss, __ssh;
628         abi_ulong fpstate; /* pointer */
629         abi_ulong oldmask;
630         abi_ulong cr2;
631 };
632 
633 struct target_ucontext {
634         abi_ulong         tuc_flags;
635         abi_ulong         tuc_link;
636 	target_stack_t	  tuc_stack;
637 	struct target_sigcontext tuc_mcontext;
638 	target_sigset_t	  tuc_sigmask;	/* mask last for extensibility */
639 };
640 
641 struct sigframe
642 {
643     abi_ulong pretcode;
644     int sig;
645     struct target_sigcontext sc;
646     struct target_fpstate fpstate;
647     abi_ulong extramask[TARGET_NSIG_WORDS-1];
648     char retcode[8];
649 };
650 
651 struct rt_sigframe
652 {
653     abi_ulong pretcode;
654     int sig;
655     abi_ulong pinfo;
656     abi_ulong puc;
657     struct target_siginfo info;
658     struct target_ucontext uc;
659     struct target_fpstate fpstate;
660     char retcode[8];
661 };
662 
663 /*
664  * Set up a signal frame.
665  */
666 
667 /* XXX: save x87 state */
668 static int
669 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
670 		 CPUX86State *env, unsigned long mask)
671 {
672 	int err = 0;
673 
674 	err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
675 	err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
676 	err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
677 	err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
678 	err |= __put_user(env->regs[R_EDI], &sc->edi);
679 	err |= __put_user(env->regs[R_ESI], &sc->esi);
680 	err |= __put_user(env->regs[R_EBP], &sc->ebp);
681 	err |= __put_user(env->regs[R_ESP], &sc->esp);
682 	err |= __put_user(env->regs[R_EBX], &sc->ebx);
683 	err |= __put_user(env->regs[R_EDX], &sc->edx);
684 	err |= __put_user(env->regs[R_ECX], &sc->ecx);
685 	err |= __put_user(env->regs[R_EAX], &sc->eax);
686 	err |= __put_user(env->exception_index, &sc->trapno);
687 	err |= __put_user(env->error_code, &sc->err);
688 	err |= __put_user(env->eip, &sc->eip);
689 	err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
690 	err |= __put_user(env->eflags, &sc->eflags);
691 	err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
692 	err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
693 
694         cpu_x86_fsave(env, (void *)fpstate, 1);
695         fpstate->status = fpstate->sw;
696         err |= __put_user(0xffff, &fpstate->magic);
697         err |= __put_user(fpstate, &sc->fpstate);
698 
699 	/* non-iBCS2 extensions.. */
700 	err |= __put_user(mask, &sc->oldmask);
701 	err |= __put_user(env->cr[2], &sc->cr2);
702 	return err;
703 }
704 
705 /*
706  * Determine which stack to use..
707  */
708 
709 static inline void *
710 get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
711 {
712 	unsigned long esp;
713 
714 	/* Default to using normal stack */
715 	esp = env->regs[R_ESP];
716 	/* This is the X/Open sanctioned signal stack switching.  */
717         if (ka->sa.sa_flags & TARGET_SA_ONSTACK) {
718             if (sas_ss_flags(esp) == 0)
719                 esp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
720         }
721 
722 	/* This is the legacy signal stack switching. */
723 	else
724         if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
725             !(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
726             ka->sa.sa_restorer) {
727             esp = (unsigned long) ka->sa.sa_restorer;
728 	}
729         return g2h((esp - frame_size) & -8ul);
730 }
731 
732 static void setup_frame(int sig, struct emulated_sigaction *ka,
733 			target_sigset_t *set, CPUX86State *env)
734 {
735 	struct sigframe *frame;
736 	int i, err = 0;
737 
738 	frame = get_sigframe(ka, env, sizeof(*frame));
739 
740 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
741 		goto give_sigsegv;
742 	err |= __put_user((/*current->exec_domain
743 		           && current->exec_domain->signal_invmap
744 		           && sig < 32
745 		           ? current->exec_domain->signal_invmap[sig]
746 		           : */ sig),
747 		          &frame->sig);
748 	if (err)
749 		goto give_sigsegv;
750 
751 	setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
752 	if (err)
753 		goto give_sigsegv;
754 
755         for(i = 1; i < TARGET_NSIG_WORDS; i++) {
756             if (__put_user(set->sig[i], &frame->extramask[i - 1]))
757                 goto give_sigsegv;
758         }
759 
760 	/* Set up to return from userspace.  If provided, use a stub
761 	   already in userspace.  */
762 	if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
763 		err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
764 	} else {
765 		err |= __put_user(frame->retcode, &frame->pretcode);
766 		/* This is popl %eax ; movl $,%eax ; int $0x80 */
767 		err |= __put_user(0xb858, (short *)(frame->retcode+0));
768 #if defined(TARGET_X86_64)
769 #warning "Fix this !"
770 #else
771 		err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
772 #endif
773 		err |= __put_user(0x80cd, (short *)(frame->retcode+6));
774 	}
775 
776 	if (err)
777 		goto give_sigsegv;
778 
779 	/* Set up registers for signal handler */
780 	env->regs[R_ESP] = h2g(frame);
781 	env->eip = (unsigned long) ka->sa._sa_handler;
782 
783         cpu_x86_load_seg(env, R_DS, __USER_DS);
784         cpu_x86_load_seg(env, R_ES, __USER_DS);
785         cpu_x86_load_seg(env, R_SS, __USER_DS);
786         cpu_x86_load_seg(env, R_CS, __USER_CS);
787 	env->eflags &= ~TF_MASK;
788 
789 	return;
790 
791 give_sigsegv:
792 	if (sig == TARGET_SIGSEGV)
793 		ka->sa._sa_handler = TARGET_SIG_DFL;
794 	force_sig(TARGET_SIGSEGV /* , current */);
795 }
796 
797 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
798                            target_siginfo_t *info,
799 			   target_sigset_t *set, CPUX86State *env)
800 {
801 	struct rt_sigframe *frame;
802 	int i, err = 0;
803 
804 	frame = get_sigframe(ka, env, sizeof(*frame));
805 
806 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
807 		goto give_sigsegv;
808 
809 	err |= __put_user((/*current->exec_domain
810 		    	   && current->exec_domain->signal_invmap
811 		    	   && sig < 32
812 		    	   ? current->exec_domain->signal_invmap[sig]
813 			   : */sig),
814 			  &frame->sig);
815 	err |= __put_user((abi_ulong)&frame->info, &frame->pinfo);
816 	err |= __put_user((abi_ulong)&frame->uc, &frame->puc);
817 	err |= copy_siginfo_to_user(&frame->info, info);
818 	if (err)
819 		goto give_sigsegv;
820 
821 	/* Create the ucontext.  */
822 	err |= __put_user(0, &frame->uc.tuc_flags);
823 	err |= __put_user(0, &frame->uc.tuc_link);
824 	err |= __put_user(target_sigaltstack_used.ss_sp,
825 			  &frame->uc.tuc_stack.ss_sp);
826 	err |= __put_user(sas_ss_flags(get_sp_from_cpustate(env)),
827 			  &frame->uc.tuc_stack.ss_flags);
828 	err |= __put_user(target_sigaltstack_used.ss_size,
829 			  &frame->uc.tuc_stack.ss_size);
830 	err |= setup_sigcontext(&frame->uc.tuc_mcontext, &frame->fpstate,
831 			        env, set->sig[0]);
832         for(i = 0; i < TARGET_NSIG_WORDS; i++) {
833             if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
834                 goto give_sigsegv;
835         }
836 
837 	/* Set up to return from userspace.  If provided, use a stub
838 	   already in userspace.  */
839 	if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
840 		err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
841 	} else {
842 		err |= __put_user(frame->retcode, &frame->pretcode);
843 		/* This is movl $,%eax ; int $0x80 */
844 		err |= __put_user(0xb8, (char *)(frame->retcode+0));
845 		err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
846 		err |= __put_user(0x80cd, (short *)(frame->retcode+5));
847 	}
848 
849 	if (err)
850 		goto give_sigsegv;
851 
852 	/* Set up registers for signal handler */
853 	env->regs[R_ESP] = (unsigned long) frame;
854 	env->eip = (unsigned long) ka->sa._sa_handler;
855 
856         cpu_x86_load_seg(env, R_DS, __USER_DS);
857         cpu_x86_load_seg(env, R_ES, __USER_DS);
858         cpu_x86_load_seg(env, R_SS, __USER_DS);
859         cpu_x86_load_seg(env, R_CS, __USER_CS);
860 	env->eflags &= ~TF_MASK;
861 
862 	return;
863 
864 give_sigsegv:
865 	if (sig == TARGET_SIGSEGV)
866 		ka->sa._sa_handler = TARGET_SIG_DFL;
867 	force_sig(TARGET_SIGSEGV /* , current */);
868 }
869 
870 static int
871 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
872 {
873 	unsigned int err = 0;
874 
875         cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
876         cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
877         cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
878         cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
879 
880         env->regs[R_EDI] = ldl(&sc->edi);
881         env->regs[R_ESI] = ldl(&sc->esi);
882         env->regs[R_EBP] = ldl(&sc->ebp);
883         env->regs[R_ESP] = ldl(&sc->esp);
884         env->regs[R_EBX] = ldl(&sc->ebx);
885         env->regs[R_EDX] = ldl(&sc->edx);
886         env->regs[R_ECX] = ldl(&sc->ecx);
887         env->eip = ldl(&sc->eip);
888 
889         cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
890         cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
891 
892 	{
893 		unsigned int tmpflags;
894                 tmpflags = ldl(&sc->eflags);
895 		env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
896                 //		regs->orig_eax = -1;		/* disable syscall checks */
897 	}
898 
899 	{
900 		struct _fpstate * buf;
901                 buf = (void *)ldl(&sc->fpstate);
902 		if (buf) {
903 #if 0
904 			if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
905 				goto badframe;
906 #endif
907                         cpu_x86_frstor(env, (void *)buf, 1);
908 		}
909 	}
910 
911         *peax = ldl(&sc->eax);
912 	return err;
913 #if 0
914 badframe:
915 	return 1;
916 #endif
917 }
918 
919 long do_sigreturn(CPUX86State *env)
920 {
921     struct sigframe *frame = (struct sigframe *)g2h(env->regs[R_ESP] - 8);
922     target_sigset_t target_set;
923     sigset_t set;
924     int eax, i;
925 
926 #if defined(DEBUG_SIGNAL)
927     fprintf(stderr, "do_sigreturn\n");
928 #endif
929     /* set blocked signals */
930     if (__get_user(target_set.sig[0], &frame->sc.oldmask))
931         goto badframe;
932     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
933         if (__get_user(target_set.sig[i], &frame->extramask[i - 1]))
934             goto badframe;
935     }
936 
937     target_to_host_sigset_internal(&set, &target_set);
938     sigprocmask(SIG_SETMASK, &set, NULL);
939 
940     /* restore registers */
941     if (restore_sigcontext(env, &frame->sc, &eax))
942         goto badframe;
943     return eax;
944 
945 badframe:
946     force_sig(TARGET_SIGSEGV);
947     return 0;
948 }
949 
950 long do_rt_sigreturn(CPUX86State *env)
951 {
952 	struct rt_sigframe *frame = (struct rt_sigframe *)g2h(env->regs[R_ESP] - 4);
953         sigset_t set;
954 	int eax;
955 
956 #if 0
957 	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
958 		goto badframe;
959 #endif
960         target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
961         sigprocmask(SIG_SETMASK, &set, NULL);
962 
963 	if (restore_sigcontext(env, &frame->uc.tuc_mcontext, &eax))
964 		goto badframe;
965 
966 	if (do_sigaltstack(&frame->uc.tuc_stack, NULL, get_sp_from_cpustate(env)) == -EFAULT)
967 		goto badframe;
968 
969 	return eax;
970 
971 badframe:
972 	force_sig(TARGET_SIGSEGV);
973 	return 0;
974 }
975 
976 #elif defined(TARGET_ARM)
977 
978 struct target_sigcontext {
979 	abi_ulong trap_no;
980 	abi_ulong error_code;
981 	abi_ulong oldmask;
982 	abi_ulong arm_r0;
983 	abi_ulong arm_r1;
984 	abi_ulong arm_r2;
985 	abi_ulong arm_r3;
986 	abi_ulong arm_r4;
987 	abi_ulong arm_r5;
988 	abi_ulong arm_r6;
989 	abi_ulong arm_r7;
990 	abi_ulong arm_r8;
991 	abi_ulong arm_r9;
992 	abi_ulong arm_r10;
993 	abi_ulong arm_fp;
994 	abi_ulong arm_ip;
995 	abi_ulong arm_sp;
996 	abi_ulong arm_lr;
997 	abi_ulong arm_pc;
998 	abi_ulong arm_cpsr;
999 	abi_ulong fault_address;
1000 };
1001 
1002 struct target_ucontext {
1003     abi_ulong tuc_flags;
1004     abi_ulong tuc_link;
1005     target_stack_t tuc_stack;
1006     struct target_sigcontext tuc_mcontext;
1007     target_sigset_t  tuc_sigmask;	/* mask last for extensibility */
1008 };
1009 
1010 struct sigframe
1011 {
1012     struct target_sigcontext sc;
1013     abi_ulong extramask[TARGET_NSIG_WORDS-1];
1014     abi_ulong retcode;
1015 };
1016 
1017 struct rt_sigframe
1018 {
1019     struct target_siginfo *pinfo;
1020     void *puc;
1021     struct target_siginfo info;
1022     struct target_ucontext uc;
1023     abi_ulong retcode;
1024 };
1025 
1026 #define TARGET_CONFIG_CPU_32 1
1027 
1028 /*
1029  * For ARM syscalls, we encode the syscall number into the instruction.
1030  */
1031 #define SWI_SYS_SIGRETURN	(0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
1032 #define SWI_SYS_RT_SIGRETURN	(0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
1033 
1034 /*
1035  * For Thumb syscalls, we pass the syscall number via r7.  We therefore
1036  * need two 16-bit instructions.
1037  */
1038 #define SWI_THUMB_SIGRETURN	(0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
1039 #define SWI_THUMB_RT_SIGRETURN	(0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
1040 
1041 static const abi_ulong retcodes[4] = {
1042 	SWI_SYS_SIGRETURN,	SWI_THUMB_SIGRETURN,
1043 	SWI_SYS_RT_SIGRETURN,	SWI_THUMB_RT_SIGRETURN
1044 };
1045 
1046 
1047 #define __put_user_error(x,p,e) __put_user(x, p)
1048 #define __get_user_error(x,p,e) __get_user(x, p)
1049 
1050 static inline int valid_user_regs(CPUState *regs)
1051 {
1052     return 1;
1053 }
1054 
1055 static int
1056 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
1057 		 CPUState *env, unsigned long mask)
1058 {
1059 	int err = 0;
1060 
1061 	__put_user_error(env->regs[0], &sc->arm_r0, err);
1062 	__put_user_error(env->regs[1], &sc->arm_r1, err);
1063 	__put_user_error(env->regs[2], &sc->arm_r2, err);
1064 	__put_user_error(env->regs[3], &sc->arm_r3, err);
1065 	__put_user_error(env->regs[4], &sc->arm_r4, err);
1066 	__put_user_error(env->regs[5], &sc->arm_r5, err);
1067 	__put_user_error(env->regs[6], &sc->arm_r6, err);
1068 	__put_user_error(env->regs[7], &sc->arm_r7, err);
1069 	__put_user_error(env->regs[8], &sc->arm_r8, err);
1070 	__put_user_error(env->regs[9], &sc->arm_r9, err);
1071 	__put_user_error(env->regs[10], &sc->arm_r10, err);
1072 	__put_user_error(env->regs[11], &sc->arm_fp, err);
1073 	__put_user_error(env->regs[12], &sc->arm_ip, err);
1074 	__put_user_error(env->regs[13], &sc->arm_sp, err);
1075 	__put_user_error(env->regs[14], &sc->arm_lr, err);
1076 	__put_user_error(env->regs[15], &sc->arm_pc, err);
1077 #ifdef TARGET_CONFIG_CPU_32
1078 	__put_user_error(cpsr_read(env), &sc->arm_cpsr, err);
1079 #endif
1080 
1081 	__put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err);
1082 	__put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err);
1083 	__put_user_error(/* current->thread.address */ 0, &sc->fault_address, err);
1084 	__put_user_error(mask, &sc->oldmask, err);
1085 
1086 	return err;
1087 }
1088 
1089 static inline void *
1090 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
1091 {
1092 	unsigned long sp = regs->regs[13];
1093 
1094 	/*
1095 	 * This is the X/Open sanctioned signal stack switching.
1096 	 */
1097 	if ((ka->sa.sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp))
1098             sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
1099 	/*
1100 	 * ATPCS B01 mandates 8-byte alignment
1101 	 */
1102 	return g2h((sp - framesize) & ~7);
1103 }
1104 
1105 static int
1106 setup_return(CPUState *env, struct emulated_sigaction *ka,
1107 	     abi_ulong *rc, void *frame, int usig)
1108 {
1109 	abi_ulong handler = (abi_ulong)ka->sa._sa_handler;
1110 	abi_ulong retcode;
1111 	int thumb = 0;
1112 #if defined(TARGET_CONFIG_CPU_32)
1113 #if 0
1114 	abi_ulong cpsr = env->cpsr;
1115 
1116 	/*
1117 	 * Maybe we need to deliver a 32-bit signal to a 26-bit task.
1118 	 */
1119 	if (ka->sa.sa_flags & SA_THIRTYTWO)
1120 		cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
1121 
1122 #ifdef CONFIG_ARM_THUMB
1123 	if (elf_hwcap & HWCAP_THUMB) {
1124 		/*
1125 		 * The LSB of the handler determines if we're going to
1126 		 * be using THUMB or ARM mode for this signal handler.
1127 		 */
1128 		thumb = handler & 1;
1129 
1130 		if (thumb)
1131 			cpsr |= T_BIT;
1132 		else
1133 			cpsr &= ~T_BIT;
1134 	}
1135 #endif /* CONFIG_ARM_THUMB */
1136 #endif /* 0 */
1137 #endif /* TARGET_CONFIG_CPU_32 */
1138 
1139 	if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
1140 		retcode = (abi_ulong)ka->sa.sa_restorer;
1141 	} else {
1142 		unsigned int idx = thumb;
1143 
1144 		if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
1145 			idx += 2;
1146 
1147 		if (__put_user(retcodes[idx], rc))
1148 			return 1;
1149 #if 0
1150 		flush_icache_range((abi_ulong)rc,
1151 				   (abi_ulong)(rc + 1));
1152 #endif
1153 		retcode = ((abi_ulong)rc) + thumb;
1154 	}
1155 
1156 	env->regs[0] = usig;
1157 	env->regs[13] = h2g(frame);
1158 	env->regs[14] = retcode;
1159 	env->regs[15] = handler & (thumb ? ~1 : ~3);
1160 
1161 #if 0
1162 #ifdef TARGET_CONFIG_CPU_32
1163 	env->cpsr = cpsr;
1164 #endif
1165 #endif
1166 
1167 	return 0;
1168 }
1169 
1170 static void setup_frame(int usig, struct emulated_sigaction *ka,
1171 			target_sigset_t *set, CPUState *regs)
1172 {
1173 	struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
1174 	int i, err = 0;
1175 
1176 	err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
1177 
1178         for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1179             if (__put_user(set->sig[i], &frame->extramask[i - 1]))
1180                 return;
1181 	}
1182 
1183 	if (err == 0)
1184             err = setup_return(regs, ka, &frame->retcode, frame, usig);
1185         //	return err;
1186 }
1187 
1188 static void setup_rt_frame(int usig, struct emulated_sigaction *ka,
1189                            target_siginfo_t *info,
1190 			   target_sigset_t *set, CPUState *env)
1191 {
1192 	struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame));
1193 	struct target_sigaltstack stack;
1194 	int i, err = 0;
1195 
1196 	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
1197             return /* 1 */;
1198 
1199 	__put_user_error(&frame->info, (abi_ulong *)&frame->pinfo, err);
1200 	__put_user_error(&frame->uc, (abi_ulong *)&frame->puc, err);
1201 	err |= copy_siginfo_to_user(&frame->info, info);
1202 
1203 	/* Clear all the bits of the ucontext we don't use.  */
1204 	memset(&frame->uc, 0, offsetof(struct target_ucontext, tuc_mcontext));
1205 
1206         memset(&stack, 0, sizeof(stack));
1207         __put_user(target_sigaltstack_used.ss_sp, &stack.ss_sp);
1208         __put_user(target_sigaltstack_used.ss_size, &stack.ss_size);
1209         __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &stack.ss_flags);
1210         if (!access_ok(VERIFY_WRITE, &frame->uc.tuc_stack, sizeof(stack)))
1211             err = 1;
1212         else
1213             memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
1214 
1215 	err |= setup_sigcontext(&frame->uc.tuc_mcontext, /*&frame->fpstate,*/
1216 				env, set->sig[0]);
1217         for(i = 0; i < TARGET_NSIG_WORDS; i++) {
1218             if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
1219                 return;
1220         }
1221 
1222 	if (err == 0)
1223 		err = setup_return(env, ka, &frame->retcode, frame, usig);
1224 
1225 	if (err == 0) {
1226 		/*
1227 		 * For realtime signals we must also set the second and third
1228 		 * arguments for the signal handler.
1229 		 *   -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
1230 		 */
1231             env->regs[1] = (abi_ulong)frame->pinfo;
1232             env->regs[2] = (abi_ulong)frame->puc;
1233 	}
1234 
1235         //	return err;
1236 }
1237 
1238 static int
1239 restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
1240 {
1241 	int err = 0;
1242         uint32_t cpsr;
1243 
1244 	__get_user_error(env->regs[0], &sc->arm_r0, err);
1245 	__get_user_error(env->regs[1], &sc->arm_r1, err);
1246 	__get_user_error(env->regs[2], &sc->arm_r2, err);
1247 	__get_user_error(env->regs[3], &sc->arm_r3, err);
1248 	__get_user_error(env->regs[4], &sc->arm_r4, err);
1249 	__get_user_error(env->regs[5], &sc->arm_r5, err);
1250 	__get_user_error(env->regs[6], &sc->arm_r6, err);
1251 	__get_user_error(env->regs[7], &sc->arm_r7, err);
1252 	__get_user_error(env->regs[8], &sc->arm_r8, err);
1253 	__get_user_error(env->regs[9], &sc->arm_r9, err);
1254 	__get_user_error(env->regs[10], &sc->arm_r10, err);
1255 	__get_user_error(env->regs[11], &sc->arm_fp, err);
1256 	__get_user_error(env->regs[12], &sc->arm_ip, err);
1257 	__get_user_error(env->regs[13], &sc->arm_sp, err);
1258 	__get_user_error(env->regs[14], &sc->arm_lr, err);
1259 	__get_user_error(env->regs[15], &sc->arm_pc, err);
1260 #ifdef TARGET_CONFIG_CPU_32
1261 	__get_user_error(cpsr, &sc->arm_cpsr, err);
1262         cpsr_write(env, cpsr, 0xffffffff);
1263 #endif
1264 
1265 	err |= !valid_user_regs(env);
1266 
1267 	return err;
1268 }
1269 
1270 long do_sigreturn(CPUState *env)
1271 {
1272 	struct sigframe *frame;
1273 	target_sigset_t set;
1274         sigset_t host_set;
1275         int i;
1276 
1277 	/*
1278 	 * Since we stacked the signal on a 64-bit boundary,
1279 	 * then 'sp' should be word aligned here.  If it's
1280 	 * not, then the user is trying to mess with us.
1281 	 */
1282 	if (env->regs[13] & 7)
1283 		goto badframe;
1284 
1285 	frame = (struct sigframe *)g2h(env->regs[13]);
1286 
1287 #if 0
1288 	if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1289 		goto badframe;
1290 #endif
1291 	if (__get_user(set.sig[0], &frame->sc.oldmask))
1292             goto badframe;
1293         for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1294             if (__get_user(set.sig[i], &frame->extramask[i - 1]))
1295                 goto badframe;
1296         }
1297 
1298         target_to_host_sigset_internal(&host_set, &set);
1299         sigprocmask(SIG_SETMASK, &host_set, NULL);
1300 
1301 	if (restore_sigcontext(env, &frame->sc))
1302 		goto badframe;
1303 
1304 #if 0
1305 	/* Send SIGTRAP if we're single-stepping */
1306 	if (ptrace_cancel_bpt(current))
1307 		send_sig(SIGTRAP, current, 1);
1308 #endif
1309 	return env->regs[0];
1310 
1311 badframe:
1312         force_sig(SIGSEGV /* , current */);
1313 	return 0;
1314 }
1315 
1316 long do_rt_sigreturn(CPUState *env)
1317 {
1318 	struct rt_sigframe *frame;
1319         sigset_t host_set;
1320 
1321 	/*
1322 	 * Since we stacked the signal on a 64-bit boundary,
1323 	 * then 'sp' should be word aligned here.  If it's
1324 	 * not, then the user is trying to mess with us.
1325 	 */
1326 	if (env->regs[13] & 7)
1327 		goto badframe;
1328 
1329 	frame = (struct rt_sigframe *)env->regs[13];
1330 
1331 #if 0
1332 	if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1333 		goto badframe;
1334 #endif
1335         target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
1336         sigprocmask(SIG_SETMASK, &host_set, NULL);
1337 
1338 	if (restore_sigcontext(env, &frame->uc.tuc_mcontext))
1339 		goto badframe;
1340 
1341 	if (do_sigaltstack(&frame->uc.tuc_stack, NULL, get_sp_from_cpustate(env)) == -EFAULT)
1342 		goto badframe;
1343 
1344 #if 0
1345 	/* Send SIGTRAP if we're single-stepping */
1346 	if (ptrace_cancel_bpt(current))
1347 		send_sig(SIGTRAP, current, 1);
1348 #endif
1349 	return env->regs[0];
1350 
1351 badframe:
1352         force_sig(SIGSEGV /* , current */);
1353 	return 0;
1354 }
1355 
1356 #elif defined(TARGET_SPARC)
1357 
1358 #define __SUNOS_MAXWIN   31
1359 
1360 /* This is what SunOS does, so shall I. */
1361 struct target_sigcontext {
1362         abi_ulong sigc_onstack;      /* state to restore */
1363 
1364         abi_ulong sigc_mask;         /* sigmask to restore */
1365         abi_ulong sigc_sp;           /* stack pointer */
1366         abi_ulong sigc_pc;           /* program counter */
1367         abi_ulong sigc_npc;          /* next program counter */
1368         abi_ulong sigc_psr;          /* for condition codes etc */
1369         abi_ulong sigc_g1;           /* User uses these two registers */
1370         abi_ulong sigc_o0;           /* within the trampoline code. */
1371 
1372         /* Now comes information regarding the users window set
1373          * at the time of the signal.
1374          */
1375         abi_ulong sigc_oswins;       /* outstanding windows */
1376 
1377         /* stack ptrs for each regwin buf */
1378         char *sigc_spbuf[__SUNOS_MAXWIN];
1379 
1380         /* Windows to restore after signal */
1381         struct {
1382                 abi_ulong locals[8];
1383                 abi_ulong ins[8];
1384         } sigc_wbuf[__SUNOS_MAXWIN];
1385 };
1386 /* A Sparc stack frame */
1387 struct sparc_stackf {
1388         abi_ulong locals[8];
1389         abi_ulong ins[6];
1390         struct sparc_stackf *fp;
1391         abi_ulong callers_pc;
1392         char *structptr;
1393         abi_ulong xargs[6];
1394         abi_ulong xxargs[1];
1395 };
1396 
1397 typedef struct {
1398         struct {
1399                 abi_ulong psr;
1400                 abi_ulong pc;
1401                 abi_ulong npc;
1402                 abi_ulong y;
1403                 abi_ulong u_regs[16]; /* globals and ins */
1404         }               si_regs;
1405         int             si_mask;
1406 } __siginfo_t;
1407 
1408 typedef struct {
1409         unsigned   long si_float_regs [32];
1410         unsigned   long si_fsr;
1411         unsigned   long si_fpqdepth;
1412         struct {
1413                 unsigned long *insn_addr;
1414                 unsigned long insn;
1415         } si_fpqueue [16];
1416 } qemu_siginfo_fpu_t;
1417 
1418 
1419 struct target_signal_frame {
1420 	struct sparc_stackf	ss;
1421 	__siginfo_t		info;
1422 	qemu_siginfo_fpu_t 	*fpu_save;
1423 	abi_ulong		insns[2] __attribute__ ((aligned (8)));
1424 	abi_ulong		extramask[TARGET_NSIG_WORDS - 1];
1425 	abi_ulong		extra_size; /* Should be 0 */
1426 	qemu_siginfo_fpu_t	fpu_state;
1427 };
1428 struct target_rt_signal_frame {
1429 	struct sparc_stackf	ss;
1430 	siginfo_t		info;
1431 	abi_ulong		regs[20];
1432 	sigset_t		mask;
1433 	qemu_siginfo_fpu_t 	*fpu_save;
1434 	unsigned int		insns[2];
1435 	stack_t			stack;
1436 	unsigned int		extra_size; /* Should be 0 */
1437 	qemu_siginfo_fpu_t	fpu_state;
1438 };
1439 
1440 #define UREG_O0        16
1441 #define UREG_O6        22
1442 #define UREG_I0        0
1443 #define UREG_I1        1
1444 #define UREG_I2        2
1445 #define UREG_I3        3
1446 #define UREG_I4        4
1447 #define UREG_I5        5
1448 #define UREG_I6        6
1449 #define UREG_I7        7
1450 #define UREG_L0	       8
1451 #define UREG_FP        UREG_I6
1452 #define UREG_SP        UREG_O6
1453 
1454 static inline void *get_sigframe(struct emulated_sigaction *sa, CPUState *env, unsigned long framesize)
1455 {
1456 	unsigned long sp;
1457 
1458 	sp = env->regwptr[UREG_FP];
1459 
1460 	/* This is the X/Open sanctioned signal stack switching.  */
1461 	if (sa->sa.sa_flags & TARGET_SA_ONSTACK) {
1462             if (!on_sig_stack(sp)
1463                 && !((target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size) & 7))
1464                 sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
1465 	}
1466 	return g2h(sp - framesize);
1467 }
1468 
1469 static int
1470 setup___siginfo(__siginfo_t *si, CPUState *env, abi_ulong mask)
1471 {
1472 	int err = 0, i;
1473 
1474 	err |= __put_user(env->psr, &si->si_regs.psr);
1475 	err |= __put_user(env->pc, &si->si_regs.pc);
1476 	err |= __put_user(env->npc, &si->si_regs.npc);
1477 	err |= __put_user(env->y, &si->si_regs.y);
1478 	for (i=0; i < 8; i++) {
1479 		err |= __put_user(env->gregs[i], &si->si_regs.u_regs[i]);
1480 	}
1481 	for (i=0; i < 8; i++) {
1482 		err |= __put_user(env->regwptr[UREG_I0 + i], &si->si_regs.u_regs[i+8]);
1483 	}
1484 	err |= __put_user(mask, &si->si_mask);
1485 	return err;
1486 }
1487 
1488 #if 0
1489 static int
1490 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
1491 		 CPUState *env, unsigned long mask)
1492 {
1493 	int err = 0;
1494 
1495 	err |= __put_user(mask, &sc->sigc_mask);
1496 	err |= __put_user(env->regwptr[UREG_SP], &sc->sigc_sp);
1497 	err |= __put_user(env->pc, &sc->sigc_pc);
1498 	err |= __put_user(env->npc, &sc->sigc_npc);
1499 	err |= __put_user(env->psr, &sc->sigc_psr);
1500 	err |= __put_user(env->gregs[1], &sc->sigc_g1);
1501 	err |= __put_user(env->regwptr[UREG_O0], &sc->sigc_o0);
1502 
1503 	return err;
1504 }
1505 #endif
1506 #define NF_ALIGNEDSZ  (((sizeof(struct target_signal_frame) + 7) & (~7)))
1507 
1508 static void setup_frame(int sig, struct emulated_sigaction *ka,
1509 			target_sigset_t *set, CPUState *env)
1510 {
1511 	struct target_signal_frame *sf;
1512 	int sigframe_size, err, i;
1513 
1514 	/* 1. Make sure everything is clean */
1515 	//synchronize_user_stack();
1516 
1517         sigframe_size = NF_ALIGNEDSZ;
1518 
1519 	sf = (struct target_signal_frame *)
1520 		get_sigframe(ka, env, sigframe_size);
1521 
1522 	//fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
1523 #if 0
1524 	if (invalid_frame_pointer(sf, sigframe_size))
1525 		goto sigill_and_return;
1526 #endif
1527 	/* 2. Save the current process state */
1528 	err = setup___siginfo(&sf->info, env, set->sig[0]);
1529 	err |= __put_user(0, &sf->extra_size);
1530 
1531 	//err |= save_fpu_state(regs, &sf->fpu_state);
1532 	//err |= __put_user(&sf->fpu_state, &sf->fpu_save);
1533 
1534 	err |= __put_user(set->sig[0], &sf->info.si_mask);
1535 	for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
1536 		err |= __put_user(set->sig[i + 1], &sf->extramask[i]);
1537 	}
1538 
1539 	for (i = 0; i < 8; i++) {
1540 	  	err |= __put_user(env->regwptr[i + UREG_L0], &sf->ss.locals[i]);
1541 	}
1542 	for (i = 0; i < 8; i++) {
1543 	  	err |= __put_user(env->regwptr[i + UREG_I0], &sf->ss.ins[i]);
1544 	}
1545 	if (err)
1546 		goto sigsegv;
1547 
1548 	/* 3. signal handler back-trampoline and parameters */
1549 	env->regwptr[UREG_FP] = h2g(sf);
1550 	env->regwptr[UREG_I0] = sig;
1551 	env->regwptr[UREG_I1] = h2g(&sf->info);
1552 	env->regwptr[UREG_I2] = h2g(&sf->info);
1553 
1554 	/* 4. signal handler */
1555 	env->pc = (unsigned long) ka->sa._sa_handler;
1556 	env->npc = (env->pc + 4);
1557 	/* 5. return to kernel instructions */
1558 	if (ka->sa.sa_restorer)
1559 		env->regwptr[UREG_I7] = (unsigned long)ka->sa.sa_restorer;
1560 	else {
1561 		env->regwptr[UREG_I7] = h2g(&(sf->insns[0]) - 2);
1562 
1563 		/* mov __NR_sigreturn, %g1 */
1564 		err |= __put_user(0x821020d8, &sf->insns[0]);
1565 
1566 		/* t 0x10 */
1567 		err |= __put_user(0x91d02010, &sf->insns[1]);
1568 		if (err)
1569 			goto sigsegv;
1570 
1571 		/* Flush instruction space. */
1572 		//flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
1573                 //		tb_flush(env);
1574 	}
1575 	return;
1576 
1577         //sigill_and_return:
1578 	force_sig(TARGET_SIGILL);
1579 sigsegv:
1580 	//fprintf(stderr, "force_sig\n");
1581 	force_sig(TARGET_SIGSEGV);
1582 }
1583 static inline int
1584 restore_fpu_state(CPUState *env, qemu_siginfo_fpu_t *fpu)
1585 {
1586         int err;
1587 #if 0
1588 #ifdef CONFIG_SMP
1589         if (current->flags & PF_USEDFPU)
1590                 regs->psr &= ~PSR_EF;
1591 #else
1592         if (current == last_task_used_math) {
1593                 last_task_used_math = 0;
1594                 regs->psr &= ~PSR_EF;
1595         }
1596 #endif
1597         current->used_math = 1;
1598         current->flags &= ~PF_USEDFPU;
1599 #endif
1600 #if 0
1601         if (verify_area (VERIFY_READ, fpu, sizeof(*fpu)))
1602                 return -EFAULT;
1603 #endif
1604 
1605 #if 0
1606         /* XXX: incorrect */
1607         err = __copy_from_user(&env->fpr[0], &fpu->si_float_regs[0],
1608 	                             (sizeof(unsigned long) * 32));
1609 #endif
1610         err |= __get_user(env->fsr, &fpu->si_fsr);
1611 #if 0
1612         err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
1613         if (current->thread.fpqdepth != 0)
1614                 err |= __copy_from_user(&current->thread.fpqueue[0],
1615                                         &fpu->si_fpqueue[0],
1616                                         ((sizeof(unsigned long) +
1617                                         (sizeof(unsigned long *)))*16));
1618 #endif
1619         return err;
1620 }
1621 
1622 
1623 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1624                            target_siginfo_t *info,
1625 			   target_sigset_t *set, CPUState *env)
1626 {
1627     fprintf(stderr, "setup_rt_frame: not implemented\n");
1628 }
1629 
1630 long do_sigreturn(CPUState *env)
1631 {
1632         struct target_signal_frame *sf;
1633         uint32_t up_psr, pc, npc;
1634         target_sigset_t set;
1635         sigset_t host_set;
1636         abi_ulong fpu_save;
1637         int err, i;
1638 
1639         sf = (struct target_signal_frame *)g2h(env->regwptr[UREG_FP]);
1640 #if 0
1641 	fprintf(stderr, "sigreturn\n");
1642 	fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
1643 #endif
1644 	//cpu_dump_state(env, stderr, fprintf, 0);
1645 
1646         /* 1. Make sure we are not getting garbage from the user */
1647 #if 0
1648         if (verify_area (VERIFY_READ, sf, sizeof (*sf)))
1649                 goto segv_and_exit;
1650 #endif
1651 
1652         if (((uint) sf) & 3)
1653                 goto segv_and_exit;
1654 
1655         err = __get_user(pc,  &sf->info.si_regs.pc);
1656         err |= __get_user(npc, &sf->info.si_regs.npc);
1657 
1658         if ((pc | npc) & 3)
1659                 goto segv_and_exit;
1660 
1661         /* 2. Restore the state */
1662         err |= __get_user(up_psr, &sf->info.si_regs.psr);
1663 
1664         /* User can only change condition codes and FPU enabling in %psr. */
1665         env->psr = (up_psr & (PSR_ICC /* | PSR_EF */))
1666                   | (env->psr & ~(PSR_ICC /* | PSR_EF */));
1667 
1668 	env->pc = pc;
1669 	env->npc = npc;
1670         err |= __get_user(env->y, &sf->info.si_regs.y);
1671 	for (i=0; i < 8; i++) {
1672 		err |= __get_user(env->gregs[i], &sf->info.si_regs.u_regs[i]);
1673 	}
1674 	for (i=0; i < 8; i++) {
1675 		err |= __get_user(env->regwptr[i + UREG_I0], &sf->info.si_regs.u_regs[i+8]);
1676 	}
1677 
1678         err |= __get_user(fpu_save, (abi_ulong *)&sf->fpu_save);
1679 
1680         //if (fpu_save)
1681         //        err |= restore_fpu_state(env, fpu_save);
1682 
1683         /* This is pretty much atomic, no amount locking would prevent
1684          * the races which exist anyways.
1685          */
1686         err |= __get_user(set.sig[0], &sf->info.si_mask);
1687         for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1688             err |= (__get_user(set.sig[i], &sf->extramask[i - 1]));
1689         }
1690 
1691         target_to_host_sigset_internal(&host_set, &set);
1692         sigprocmask(SIG_SETMASK, &host_set, NULL);
1693 
1694         if (err)
1695                 goto segv_and_exit;
1696 
1697         return env->regwptr[0];
1698 
1699 segv_and_exit:
1700 	force_sig(TARGET_SIGSEGV);
1701 }
1702 
1703 long do_rt_sigreturn(CPUState *env)
1704 {
1705     fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1706     return -ENOSYS;
1707 }
1708 
1709 #ifdef TARGET_SPARC64
1710 #define MC_TSTATE 0
1711 #define MC_PC 1
1712 #define MC_NPC 2
1713 #define MC_Y 3
1714 #define MC_G1 4
1715 #define MC_G2 5
1716 #define MC_G3 6
1717 #define MC_G4 7
1718 #define MC_G5 8
1719 #define MC_G6 9
1720 #define MC_G7 10
1721 #define MC_O0 11
1722 #define MC_O1 12
1723 #define MC_O2 13
1724 #define MC_O3 14
1725 #define MC_O4 15
1726 #define MC_O5 16
1727 #define MC_O6 17
1728 #define MC_O7 18
1729 #define MC_NGREG 19
1730 
1731 typedef abi_ulong target_mc_greg_t;
1732 typedef target_mc_greg_t target_mc_gregset_t[MC_NGREG];
1733 
1734 struct target_mc_fq {
1735     abi_ulong *mcfq_addr;
1736     uint32_t mcfq_insn;
1737 };
1738 
1739 struct target_mc_fpu {
1740     union {
1741         uint32_t sregs[32];
1742         uint64_t dregs[32];
1743         //uint128_t qregs[16];
1744     } mcfpu_fregs;
1745     abi_ulong mcfpu_fsr;
1746     abi_ulong mcfpu_fprs;
1747     abi_ulong mcfpu_gsr;
1748     struct target_mc_fq *mcfpu_fq;
1749     unsigned char mcfpu_qcnt;
1750     unsigned char mcfpu_qentsz;
1751     unsigned char mcfpu_enab;
1752 };
1753 typedef struct target_mc_fpu target_mc_fpu_t;
1754 
1755 typedef struct {
1756     target_mc_gregset_t mc_gregs;
1757     target_mc_greg_t mc_fp;
1758     target_mc_greg_t mc_i7;
1759     target_mc_fpu_t mc_fpregs;
1760 } target_mcontext_t;
1761 
1762 struct target_ucontext {
1763     struct target_ucontext *uc_link;
1764     abi_ulong uc_flags;
1765     target_sigset_t uc_sigmask;
1766     target_mcontext_t uc_mcontext;
1767 };
1768 
1769 /* A V9 register window */
1770 struct target_reg_window {
1771     abi_ulong locals[8];
1772     abi_ulong ins[8];
1773 };
1774 
1775 #define TARGET_STACK_BIAS 2047
1776 
1777 /* {set, get}context() needed for 64-bit SparcLinux userland. */
1778 void sparc64_set_context(CPUSPARCState *env)
1779 {
1780     struct target_ucontext *ucp = (struct target_ucontext *)
1781         env->regwptr[UREG_I0];
1782     target_mc_gregset_t *grp;
1783     abi_ulong pc, npc, tstate;
1784     abi_ulong fp, i7;
1785     unsigned char fenab;
1786     int err;
1787     unsigned int i;
1788     abi_ulong *src, *dst;
1789 
1790     grp  = &ucp->uc_mcontext.mc_gregs;
1791     err  = get_user(pc, &((*grp)[MC_PC]));
1792     err |= get_user(npc, &((*grp)[MC_NPC]));
1793     if (err || ((pc | npc) & 3))
1794         goto do_sigsegv;
1795     if (env->regwptr[UREG_I1]) {
1796         target_sigset_t target_set;
1797         sigset_t set;
1798 
1799         if (TARGET_NSIG_WORDS == 1) {
1800             if (get_user(target_set.sig[0], &ucp->uc_sigmask.sig[0]))
1801                 goto do_sigsegv;
1802         } else {
1803             src = &ucp->uc_sigmask;
1804             dst = &target_set;
1805             for (i = 0; i < sizeof(target_sigset_t) / sizeof(abi_ulong);
1806                  i++, dst++, src++)
1807                 err |= get_user(dst, src);
1808             if (err)
1809                 goto do_sigsegv;
1810         }
1811         target_to_host_sigset_internal(&set, &target_set);
1812         sigprocmask(SIG_SETMASK, &set, NULL);
1813     }
1814     env->pc = pc;
1815     env->npc = npc;
1816     err |= get_user(env->y, &((*grp)[MC_Y]));
1817     err |= get_user(tstate, &((*grp)[MC_TSTATE]));
1818     env->asi = (tstate >> 24) & 0xff;
1819     PUT_CCR(env, tstate >> 32);
1820     PUT_CWP64(env, tstate & 0x1f);
1821     err |= get_user(env->gregs[1], (&(*grp)[MC_G1]));
1822     err |= get_user(env->gregs[2], (&(*grp)[MC_G2]));
1823     err |= get_user(env->gregs[3], (&(*grp)[MC_G3]));
1824     err |= get_user(env->gregs[4], (&(*grp)[MC_G4]));
1825     err |= get_user(env->gregs[5], (&(*grp)[MC_G5]));
1826     err |= get_user(env->gregs[6], (&(*grp)[MC_G6]));
1827     err |= get_user(env->gregs[7], (&(*grp)[MC_G7]));
1828     err |= get_user(env->regwptr[UREG_I0], (&(*grp)[MC_O0]));
1829     err |= get_user(env->regwptr[UREG_I1], (&(*grp)[MC_O1]));
1830     err |= get_user(env->regwptr[UREG_I2], (&(*grp)[MC_O2]));
1831     err |= get_user(env->regwptr[UREG_I3], (&(*grp)[MC_O3]));
1832     err |= get_user(env->regwptr[UREG_I4], (&(*grp)[MC_O4]));
1833     err |= get_user(env->regwptr[UREG_I5], (&(*grp)[MC_O5]));
1834     err |= get_user(env->regwptr[UREG_I6], (&(*grp)[MC_O6]));
1835     err |= get_user(env->regwptr[UREG_I7], (&(*grp)[MC_O7]));
1836 
1837     err |= get_user(fp, &(ucp->uc_mcontext.mc_fp));
1838     err |= get_user(i7, &(ucp->uc_mcontext.mc_i7));
1839     err |= put_user(fp,
1840                     (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[6])));
1841     err |= put_user(i7,
1842                     (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[7])));
1843 
1844     err |= get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
1845     err |= get_user(env->fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
1846     src = &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs);
1847     dst = &env->fpr;
1848     for (i = 0; i < 64; i++, dst++, src++)
1849         err |= get_user(dst, src);
1850     err |= get_user(env->fsr,
1851                     &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
1852     err |= get_user(env->gsr,
1853                     &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
1854     if (err)
1855         goto do_sigsegv;
1856 
1857     return;
1858  do_sigsegv:
1859     force_sig(SIGSEGV);
1860 }
1861 
1862 void sparc64_get_context(CPUSPARCState *env)
1863 {
1864     struct target_ucontext *ucp = (struct target_ucontext *)
1865         env->regwptr[UREG_I0];
1866     target_mc_gregset_t *grp;
1867     target_mcontext_t *mcp;
1868     abi_ulong fp, i7;
1869     int err;
1870     unsigned int i;
1871     abi_ulong *src, *dst;
1872     target_sigset_t target_set;
1873     sigset_t set;
1874 
1875     mcp = &ucp->uc_mcontext;
1876     grp = &mcp->mc_gregs;
1877 
1878     /* Skip over the trap instruction, first. */
1879     env->pc = env->npc;
1880     env->npc += 4;
1881 
1882     err = 0;
1883 
1884     sigprocmask(0, NULL, &set);
1885     host_to_target_sigset_internal(&target_set, &set);
1886     if (TARGET_NSIG_WORDS == 1)
1887         err |= put_user(target_set.sig[0],
1888                         (abi_ulong *)&ucp->uc_sigmask);
1889     else {
1890         src = &target_set;
1891         dst = &ucp->uc_sigmask;
1892         for (i = 0; i < sizeof(target_sigset_t) / sizeof(abi_ulong);
1893              i++, dst++, src++)
1894             err |= put_user(src, dst);
1895         if (err)
1896             goto do_sigsegv;
1897     }
1898 
1899     err |= put_user(env->tstate, &((*grp)[MC_TSTATE]));
1900     err |= put_user(env->pc, &((*grp)[MC_PC]));
1901     err |= put_user(env->npc, &((*grp)[MC_NPC]));
1902     err |= put_user(env->y, &((*grp)[MC_Y]));
1903     err |= put_user(env->gregs[1], &((*grp)[MC_G1]));
1904     err |= put_user(env->gregs[2], &((*grp)[MC_G2]));
1905     err |= put_user(env->gregs[3], &((*grp)[MC_G3]));
1906     err |= put_user(env->gregs[4], &((*grp)[MC_G4]));
1907     err |= put_user(env->gregs[5], &((*grp)[MC_G5]));
1908     err |= put_user(env->gregs[6], &((*grp)[MC_G6]));
1909     err |= put_user(env->gregs[7], &((*grp)[MC_G7]));
1910     err |= put_user(env->regwptr[UREG_I0], &((*grp)[MC_O0]));
1911     err |= put_user(env->regwptr[UREG_I1], &((*grp)[MC_O1]));
1912     err |= put_user(env->regwptr[UREG_I2], &((*grp)[MC_O2]));
1913     err |= put_user(env->regwptr[UREG_I3], &((*grp)[MC_O3]));
1914     err |= put_user(env->regwptr[UREG_I4], &((*grp)[MC_O4]));
1915     err |= put_user(env->regwptr[UREG_I5], &((*grp)[MC_O5]));
1916     err |= put_user(env->regwptr[UREG_I6], &((*grp)[MC_O6]));
1917     err |= put_user(env->regwptr[UREG_I7], &((*grp)[MC_O7]));
1918 
1919     err |= get_user(fp,
1920                     (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[6])));
1921     err |= get_user(i7,
1922                     (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[7])));
1923     err |= put_user(fp, &(mcp->mc_fp));
1924     err |= put_user(i7, &(mcp->mc_i7));
1925 
1926     src = &env->fpr;
1927     dst = &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs);
1928     for (i = 0; i < 64; i++, dst++, src++)
1929         err |= put_user(src, dst);
1930     err |= put_user(env->fsr, &(mcp->mc_fpregs.mcfpu_fsr));
1931     err |= put_user(env->gsr, &(mcp->mc_fpregs.mcfpu_gsr));
1932     err |= put_user(env->fprs, &(mcp->mc_fpregs.mcfpu_fprs));
1933 
1934     if (err)
1935         goto do_sigsegv;
1936 
1937     return;
1938  do_sigsegv:
1939     force_sig(SIGSEGV);
1940 }
1941 #endif
1942 #elif defined(TARGET_MIPS64)
1943 
1944 # warning signal handling not implemented
1945 
1946 static void setup_frame(int sig, struct emulated_sigaction *ka,
1947 			target_sigset_t *set, CPUState *env)
1948 {
1949     fprintf(stderr, "setup_frame: not implemented\n");
1950 }
1951 
1952 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1953                            target_siginfo_t *info,
1954 			   target_sigset_t *set, CPUState *env)
1955 {
1956     fprintf(stderr, "setup_rt_frame: not implemented\n");
1957 }
1958 
1959 long do_sigreturn(CPUState *env)
1960 {
1961     fprintf(stderr, "do_sigreturn: not implemented\n");
1962     return -ENOSYS;
1963 }
1964 
1965 long do_rt_sigreturn(CPUState *env)
1966 {
1967     fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1968     return -ENOSYS;
1969 }
1970 
1971 #elif defined(TARGET_MIPSN32)
1972 
1973 # warning signal handling not implemented
1974 
1975 static void setup_frame(int sig, struct emulated_sigaction *ka,
1976 			target_sigset_t *set, CPUState *env)
1977 {
1978     fprintf(stderr, "setup_frame: not implemented\n");
1979 }
1980 
1981 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1982                            target_siginfo_t *info,
1983 			   target_sigset_t *set, CPUState *env)
1984 {
1985     fprintf(stderr, "setup_rt_frame: not implemented\n");
1986 }
1987 
1988 long do_sigreturn(CPUState *env)
1989 {
1990     fprintf(stderr, "do_sigreturn: not implemented\n");
1991     return -ENOSYS;
1992 }
1993 
1994 long do_rt_sigreturn(CPUState *env)
1995 {
1996     fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1997     return -ENOSYS;
1998 }
1999 
2000 #elif defined(TARGET_MIPS)
2001 
2002 struct target_sigcontext {
2003     uint32_t   sc_regmask;     /* Unused */
2004     uint32_t   sc_status;
2005     uint64_t   sc_pc;
2006     uint64_t   sc_regs[32];
2007     uint64_t   sc_fpregs[32];
2008     uint32_t   sc_ownedfp;     /* Unused */
2009     uint32_t   sc_fpc_csr;
2010     uint32_t   sc_fpc_eir;     /* Unused */
2011     uint32_t   sc_used_math;
2012     uint32_t   sc_dsp;         /* dsp status, was sc_ssflags */
2013     uint64_t   sc_mdhi;
2014     uint64_t   sc_mdlo;
2015     target_ulong   sc_hi1;         /* Was sc_cause */
2016     target_ulong   sc_lo1;         /* Was sc_badvaddr */
2017     target_ulong   sc_hi2;         /* Was sc_sigset[4] */
2018     target_ulong   sc_lo2;
2019     target_ulong   sc_hi3;
2020     target_ulong   sc_lo3;
2021 };
2022 
2023 struct sigframe {
2024     uint32_t sf_ass[4];			/* argument save space for o32 */
2025     uint32_t sf_code[2];			/* signal trampoline */
2026     struct target_sigcontext sf_sc;
2027     target_sigset_t sf_mask;
2028 };
2029 
2030 /* Install trampoline to jump back from signal handler */
2031 static inline int install_sigtramp(unsigned int *tramp,   unsigned int syscall)
2032 {
2033     int err;
2034 
2035     /*
2036     * Set up the return code ...
2037     *
2038     *         li      v0, __NR__foo_sigreturn
2039     *         syscall
2040     */
2041 
2042     err = __put_user(0x24020000 + syscall, tramp + 0);
2043     err |= __put_user(0x0000000c          , tramp + 1);
2044     /* flush_cache_sigtramp((unsigned long) tramp); */
2045     return err;
2046 }
2047 
2048 static inline int
2049 setup_sigcontext(CPUState *regs, struct target_sigcontext *sc)
2050 {
2051     int err = 0;
2052 
2053     err |= __put_user(regs->PC[regs->current_tc], &sc->sc_pc);
2054 
2055 #define save_gp_reg(i) do {   							\
2056         err |= __put_user(regs->gpr[i][regs->current_tc], &sc->sc_regs[i]);	\
2057     } while(0)
2058     __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
2059     save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
2060     save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
2061     save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
2062     save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
2063     save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
2064     save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
2065     save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
2066     save_gp_reg(31);
2067 #undef save_gp_reg
2068 
2069     err |= __put_user(regs->HI[0][regs->current_tc], &sc->sc_mdhi);
2070     err |= __put_user(regs->LO[0][regs->current_tc], &sc->sc_mdlo);
2071 
2072     /* Not used yet, but might be useful if we ever have DSP suppport */
2073 #if 0
2074     if (cpu_has_dsp) {
2075 	err |= __put_user(mfhi1(), &sc->sc_hi1);
2076 	err |= __put_user(mflo1(), &sc->sc_lo1);
2077 	err |= __put_user(mfhi2(), &sc->sc_hi2);
2078 	err |= __put_user(mflo2(), &sc->sc_lo2);
2079 	err |= __put_user(mfhi3(), &sc->sc_hi3);
2080 	err |= __put_user(mflo3(), &sc->sc_lo3);
2081 	err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
2082     }
2083     /* same with 64 bit */
2084 #ifdef CONFIG_64BIT
2085     err |= __put_user(regs->hi, &sc->sc_hi[0]);
2086     err |= __put_user(regs->lo, &sc->sc_lo[0]);
2087     if (cpu_has_dsp) {
2088 	err |= __put_user(mfhi1(), &sc->sc_hi[1]);
2089 	err |= __put_user(mflo1(), &sc->sc_lo[1]);
2090 	err |= __put_user(mfhi2(), &sc->sc_hi[2]);
2091 	err |= __put_user(mflo2(), &sc->sc_lo[2]);
2092 	err |= __put_user(mfhi3(), &sc->sc_hi[3]);
2093 	err |= __put_user(mflo3(), &sc->sc_lo[3]);
2094 	err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
2095     }
2096 #endif
2097 #endif
2098 
2099 #if 0
2100     err |= __put_user(!!used_math(), &sc->sc_used_math);
2101 
2102     if (!used_math())
2103 	goto out;
2104 
2105     /*
2106     * Save FPU state to signal context.  Signal handler will "inherit"
2107     * current FPU state.
2108     */
2109     preempt_disable();
2110 
2111     if (!is_fpu_owner()) {
2112 	own_fpu();
2113 	restore_fp(current);
2114     }
2115     err |= save_fp_context(sc);
2116 
2117     preempt_enable();
2118     out:
2119 #endif
2120     return err;
2121 }
2122 
2123 static inline int
2124 restore_sigcontext(CPUState *regs, struct target_sigcontext *sc)
2125 {
2126     int err = 0;
2127 
2128     err |= __get_user(regs->CP0_EPC, &sc->sc_pc);
2129 
2130     err |= __get_user(regs->HI[0][regs->current_tc], &sc->sc_mdhi);
2131     err |= __get_user(regs->LO[0][regs->current_tc], &sc->sc_mdlo);
2132 
2133 #define restore_gp_reg(i) do {   							\
2134         err |= __get_user(regs->gpr[i][regs->current_tc], &sc->sc_regs[i]);		\
2135     } while(0)
2136     restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
2137     restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
2138     restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
2139     restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
2140     restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
2141     restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
2142     restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
2143     restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
2144     restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
2145     restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
2146     restore_gp_reg(31);
2147 #undef restore_gp_reg
2148 
2149 #if 0
2150     if (cpu_has_dsp) {
2151 	err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
2152 	err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
2153 	err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
2154 	err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
2155 	err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
2156 	err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
2157 	err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
2158     }
2159 #ifdef CONFIG_64BIT
2160     err |= __get_user(regs->hi, &sc->sc_hi[0]);
2161     err |= __get_user(regs->lo, &sc->sc_lo[0]);
2162     if (cpu_has_dsp) {
2163 	err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
2164 	err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
2165 	err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
2166 	err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
2167 	err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
2168 	err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
2169 	err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
2170     }
2171 #endif
2172 
2173     err |= __get_user(used_math, &sc->sc_used_math);
2174     conditional_used_math(used_math);
2175 
2176     preempt_disable();
2177 
2178     if (used_math()) {
2179 	/* restore fpu context if we have used it before */
2180 	own_fpu();
2181 	err |= restore_fp_context(sc);
2182     } else {
2183 	/* signal handler may have used FPU.  Give it up. */
2184 	lose_fpu();
2185     }
2186 
2187     preempt_enable();
2188 #endif
2189     return err;
2190 }
2191 /*
2192  * Determine which stack to use..
2193  */
2194 static inline void *
2195 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, size_t frame_size)
2196 {
2197     unsigned long sp;
2198 
2199     /* Default to using normal stack */
2200     sp = regs->gpr[29][regs->current_tc];
2201 
2202     /*
2203      * FPU emulator may have it's own trampoline active just
2204      * above the user stack, 16-bytes before the next lowest
2205      * 16 byte boundary.  Try to avoid trashing it.
2206      */
2207     sp -= 32;
2208 
2209     /* This is the X/Open sanctioned signal stack switching.  */
2210     if ((ka->sa.sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags (sp) == 0)) {
2211         sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
2212     }
2213 
2214     return g2h((sp - frame_size) & ~7);
2215 }
2216 
2217 static void setup_frame(int sig, struct emulated_sigaction * ka,
2218    		target_sigset_t *set, CPUState *regs)
2219 {
2220     struct sigframe *frame;
2221     int i;
2222 
2223     frame = get_sigframe(ka, regs, sizeof(*frame));
2224     if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
2225 	goto give_sigsegv;
2226 
2227     install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
2228 
2229     if(setup_sigcontext(regs, &frame->sf_sc))
2230 	goto give_sigsegv;
2231 
2232     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
2233 	if(__put_user(set->sig[i], &frame->sf_mask.sig[i]))
2234 	    goto give_sigsegv;
2235     }
2236 
2237     /*
2238     * Arguments to signal handler:
2239     *
2240     *   a0 = signal number
2241     *   a1 = 0 (should be cause)
2242     *   a2 = pointer to struct sigcontext
2243     *
2244     * $25 and PC point to the signal handler, $29 points to the
2245     * struct sigframe.
2246     */
2247     regs->gpr[ 4][regs->current_tc] = sig;
2248     regs->gpr[ 5][regs->current_tc] = 0;
2249     regs->gpr[ 6][regs->current_tc] = h2g(&frame->sf_sc);
2250     regs->gpr[29][regs->current_tc] = h2g(frame);
2251     regs->gpr[31][regs->current_tc] = h2g(frame->sf_code);
2252     /* The original kernel code sets CP0_EPC to the handler
2253     * since it returns to userland using eret
2254     * we cannot do this here, and we must set PC directly */
2255     regs->PC[regs->current_tc] = regs->gpr[25][regs->current_tc] = ka->sa._sa_handler;
2256     return;
2257 
2258 give_sigsegv:
2259     force_sig(TARGET_SIGSEGV/*, current*/);
2260     return;
2261 }
2262 
2263 long do_sigreturn(CPUState *regs)
2264 {
2265     struct sigframe *frame;
2266     sigset_t blocked;
2267     target_sigset_t target_set;
2268     int i;
2269 
2270 #if defined(DEBUG_SIGNAL)
2271     fprintf(stderr, "do_sigreturn\n");
2272 #endif
2273     frame = (struct sigframe *) regs->gpr[29][regs->current_tc];
2274     if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
2275    	goto badframe;
2276 
2277     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
2278    	if(__get_user(target_set.sig[i], &frame->sf_mask.sig[i]))
2279 	    goto badframe;
2280     }
2281 
2282     target_to_host_sigset_internal(&blocked, &target_set);
2283     sigprocmask(SIG_SETMASK, &blocked, NULL);
2284 
2285     if (restore_sigcontext(regs, &frame->sf_sc))
2286    	goto badframe;
2287 
2288 #if 0
2289     /*
2290      * Don't let your children do this ...
2291      */
2292     __asm__ __volatile__(
2293    	"move\t$29, %0\n\t"
2294    	"j\tsyscall_exit"
2295    	:/* no outputs */
2296    	:"r" (&regs));
2297     /* Unreached */
2298 #endif
2299 
2300     regs->PC[regs->current_tc] = regs->CP0_EPC;
2301     /* I am not sure this is right, but it seems to work
2302     * maybe a problem with nested signals ? */
2303     regs->CP0_EPC = 0;
2304     return 0;
2305 
2306 badframe:
2307     force_sig(TARGET_SIGSEGV/*, current*/);
2308     return 0;
2309 }
2310 
2311 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
2312                            target_siginfo_t *info,
2313 			   target_sigset_t *set, CPUState *env)
2314 {
2315     fprintf(stderr, "setup_rt_frame: not implemented\n");
2316 }
2317 
2318 long do_rt_sigreturn(CPUState *env)
2319 {
2320     fprintf(stderr, "do_rt_sigreturn: not implemented\n");
2321     return -ENOSYS;
2322 }
2323 
2324 #else
2325 
2326 static void setup_frame(int sig, struct emulated_sigaction *ka,
2327 			target_sigset_t *set, CPUState *env)
2328 {
2329     fprintf(stderr, "setup_frame: not implemented\n");
2330 }
2331 
2332 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
2333                            target_siginfo_t *info,
2334 			   target_sigset_t *set, CPUState *env)
2335 {
2336     fprintf(stderr, "setup_rt_frame: not implemented\n");
2337 }
2338 
2339 long do_sigreturn(CPUState *env)
2340 {
2341     fprintf(stderr, "do_sigreturn: not implemented\n");
2342     return -ENOSYS;
2343 }
2344 
2345 long do_rt_sigreturn(CPUState *env)
2346 {
2347     fprintf(stderr, "do_rt_sigreturn: not implemented\n");
2348     return -ENOSYS;
2349 }
2350 
2351 #endif
2352 
2353 void process_pending_signals(void *cpu_env)
2354 {
2355     int sig;
2356     abi_ulong handler;
2357     sigset_t set, old_set;
2358     target_sigset_t target_old_set;
2359     struct emulated_sigaction *k;
2360     struct sigqueue *q;
2361 
2362     if (!signal_pending)
2363         return;
2364 
2365     k = sigact_table;
2366     for(sig = 1; sig <= TARGET_NSIG; sig++) {
2367         if (k->pending)
2368             goto handle_signal;
2369         k++;
2370     }
2371     /* if no signal is pending, just return */
2372     signal_pending = 0;
2373     return;
2374 
2375  handle_signal:
2376 #ifdef DEBUG_SIGNAL
2377     fprintf(stderr, "qemu: process signal %d\n", sig);
2378 #endif
2379     /* dequeue signal */
2380     q = k->first;
2381     k->first = q->next;
2382     if (!k->first)
2383         k->pending = 0;
2384 
2385     sig = gdb_handlesig (cpu_env, sig);
2386     if (!sig) {
2387         fprintf (stderr, "Lost signal\n");
2388         abort();
2389     }
2390 
2391     handler = k->sa._sa_handler;
2392     if (handler == TARGET_SIG_DFL) {
2393         /* default handler : ignore some signal. The other are fatal */
2394         if (sig != TARGET_SIGCHLD &&
2395             sig != TARGET_SIGURG &&
2396             sig != TARGET_SIGWINCH) {
2397             force_sig(sig);
2398         }
2399     } else if (handler == TARGET_SIG_IGN) {
2400         /* ignore sig */
2401     } else if (handler == TARGET_SIG_ERR) {
2402         force_sig(sig);
2403     } else {
2404         /* compute the blocked signals during the handler execution */
2405         target_to_host_sigset(&set, &k->sa.sa_mask);
2406         /* SA_NODEFER indicates that the current signal should not be
2407            blocked during the handler */
2408         if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
2409             sigaddset(&set, target_to_host_signal(sig));
2410 
2411         /* block signals in the handler using Linux */
2412         sigprocmask(SIG_BLOCK, &set, &old_set);
2413         /* save the previous blocked signal state to restore it at the
2414            end of the signal execution (see do_sigreturn) */
2415         host_to_target_sigset_internal(&target_old_set, &old_set);
2416 
2417         /* if the CPU is in VM86 mode, we restore the 32 bit values */
2418 #if defined(TARGET_I386) && !defined(TARGET_X86_64)
2419         {
2420             CPUX86State *env = cpu_env;
2421             if (env->eflags & VM_MASK)
2422                 save_v86_state(env);
2423         }
2424 #endif
2425         /* prepare the stack frame of the virtual CPU */
2426         if (k->sa.sa_flags & TARGET_SA_SIGINFO)
2427             setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
2428         else
2429             setup_frame(sig, k, &target_old_set, cpu_env);
2430 	if (k->sa.sa_flags & TARGET_SA_RESETHAND)
2431             k->sa._sa_handler = TARGET_SIG_DFL;
2432     }
2433     if (q != &k->info)
2434         free_sigqueue(q);
2435 }
2436