xref: /openbmc/qemu/linux-user/arm/signal.c (revision a003dbc6)
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, see <http://www.gnu.org/licenses/>.
18  */
19 #include "qemu/osdep.h"
20 #include "qemu.h"
21 #include "signal-common.h"
22 #include "linux-user/trace.h"
23 
24 struct target_sigcontext {
25     abi_ulong trap_no;
26     abi_ulong error_code;
27     abi_ulong oldmask;
28     abi_ulong arm_r0;
29     abi_ulong arm_r1;
30     abi_ulong arm_r2;
31     abi_ulong arm_r3;
32     abi_ulong arm_r4;
33     abi_ulong arm_r5;
34     abi_ulong arm_r6;
35     abi_ulong arm_r7;
36     abi_ulong arm_r8;
37     abi_ulong arm_r9;
38     abi_ulong arm_r10;
39     abi_ulong arm_fp;
40     abi_ulong arm_ip;
41     abi_ulong arm_sp;
42     abi_ulong arm_lr;
43     abi_ulong arm_pc;
44     abi_ulong arm_cpsr;
45     abi_ulong fault_address;
46 };
47 
48 struct target_ucontext_v1 {
49     abi_ulong tuc_flags;
50     abi_ulong tuc_link;
51     target_stack_t tuc_stack;
52     struct target_sigcontext tuc_mcontext;
53     target_sigset_t  tuc_sigmask;       /* mask last for extensibility */
54 };
55 
56 struct target_ucontext_v2 {
57     abi_ulong tuc_flags;
58     abi_ulong tuc_link;
59     target_stack_t tuc_stack;
60     struct target_sigcontext tuc_mcontext;
61     target_sigset_t  tuc_sigmask;       /* mask last for extensibility */
62     char __unused[128 - sizeof(target_sigset_t)];
63     abi_ulong tuc_regspace[128] __attribute__((__aligned__(8)));
64 };
65 
66 struct target_user_vfp {
67     uint64_t fpregs[32];
68     abi_ulong fpscr;
69 };
70 
71 struct target_user_vfp_exc {
72     abi_ulong fpexc;
73     abi_ulong fpinst;
74     abi_ulong fpinst2;
75 };
76 
77 struct target_vfp_sigframe {
78     abi_ulong magic;
79     abi_ulong size;
80     struct target_user_vfp ufp;
81     struct target_user_vfp_exc ufp_exc;
82 } __attribute__((__aligned__(8)));
83 
84 struct target_iwmmxt_sigframe {
85     abi_ulong magic;
86     abi_ulong size;
87     uint64_t regs[16];
88     /* Note that not all the coprocessor control registers are stored here */
89     uint32_t wcssf;
90     uint32_t wcasf;
91     uint32_t wcgr0;
92     uint32_t wcgr1;
93     uint32_t wcgr2;
94     uint32_t wcgr3;
95 } __attribute__((__aligned__(8)));
96 
97 #define TARGET_VFP_MAGIC 0x56465001
98 #define TARGET_IWMMXT_MAGIC 0x12ef842a
99 
100 struct sigframe_v1
101 {
102     struct target_sigcontext sc;
103     abi_ulong extramask[TARGET_NSIG_WORDS-1];
104     abi_ulong retcode[4];
105 };
106 
107 struct sigframe_v2
108 {
109     struct target_ucontext_v2 uc;
110     abi_ulong retcode[4];
111 };
112 
113 struct rt_sigframe_v1
114 {
115     abi_ulong pinfo;
116     abi_ulong puc;
117     struct target_siginfo info;
118     struct target_ucontext_v1 uc;
119     abi_ulong retcode[4];
120 };
121 
122 struct rt_sigframe_v2
123 {
124     struct target_siginfo info;
125     struct target_ucontext_v2 uc;
126     abi_ulong retcode[4];
127 };
128 
129 /*
130  * For ARM syscalls, we encode the syscall number into the instruction.
131  */
132 #define SWI_SYS_SIGRETURN       (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
133 #define SWI_SYS_RT_SIGRETURN    (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
134 
135 /*
136  * For Thumb syscalls, we pass the syscall number via r7.  We therefore
137  * need two 16-bit instructions.
138  */
139 #define SWI_THUMB_SIGRETURN     (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
140 #define SWI_THUMB_RT_SIGRETURN  (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
141 
142 static const abi_ulong retcodes[4] = {
143         SWI_SYS_SIGRETURN,      SWI_THUMB_SIGRETURN,
144         SWI_SYS_RT_SIGRETURN,   SWI_THUMB_RT_SIGRETURN
145 };
146 
147 /*
148  * Stub needed to make sure the FD register (r9) contains the right
149  * value.
150  */
151 static const unsigned long sigreturn_fdpic_codes[3] = {
152     0xe59fc004, /* ldr r12, [pc, #4] to read function descriptor */
153     0xe59c9004, /* ldr r9, [r12, #4] to setup GOT */
154     0xe59cf000  /* ldr pc, [r12] to jump into restorer */
155 };
156 
157 static const unsigned long sigreturn_fdpic_thumb_codes[3] = {
158     0xc008f8df, /* ldr r12, [pc, #8] to read function descriptor */
159     0x9004f8dc, /* ldr r9, [r12, #4] to setup GOT */
160     0xf000f8dc  /* ldr pc, [r12] to jump into restorer */
161 };
162 
163 static inline int valid_user_regs(CPUARMState *regs)
164 {
165     return 1;
166 }
167 
168 static void
169 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
170                  CPUARMState *env, abi_ulong mask)
171 {
172     __put_user(env->regs[0], &sc->arm_r0);
173     __put_user(env->regs[1], &sc->arm_r1);
174     __put_user(env->regs[2], &sc->arm_r2);
175     __put_user(env->regs[3], &sc->arm_r3);
176     __put_user(env->regs[4], &sc->arm_r4);
177     __put_user(env->regs[5], &sc->arm_r5);
178     __put_user(env->regs[6], &sc->arm_r6);
179     __put_user(env->regs[7], &sc->arm_r7);
180     __put_user(env->regs[8], &sc->arm_r8);
181     __put_user(env->regs[9], &sc->arm_r9);
182     __put_user(env->regs[10], &sc->arm_r10);
183     __put_user(env->regs[11], &sc->arm_fp);
184     __put_user(env->regs[12], &sc->arm_ip);
185     __put_user(env->regs[13], &sc->arm_sp);
186     __put_user(env->regs[14], &sc->arm_lr);
187     __put_user(env->regs[15], &sc->arm_pc);
188     __put_user(cpsr_read(env), &sc->arm_cpsr);
189 
190     __put_user(/* current->thread.trap_no */ 0, &sc->trap_no);
191     __put_user(/* current->thread.error_code */ 0, &sc->error_code);
192     __put_user(/* current->thread.address */ 0, &sc->fault_address);
193     __put_user(mask, &sc->oldmask);
194 }
195 
196 static inline abi_ulong
197 get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize)
198 {
199     unsigned long sp;
200 
201     sp = target_sigsp(get_sp_from_cpustate(regs), ka);
202     /*
203      * ATPCS B01 mandates 8-byte alignment
204      */
205     return (sp - framesize) & ~7;
206 }
207 
208 static int
209 setup_return(CPUARMState *env, struct target_sigaction *ka,
210              abi_ulong *rc, abi_ulong frame_addr, int usig, abi_ulong rc_addr)
211 {
212     abi_ulong handler = 0;
213     abi_ulong handler_fdpic_GOT = 0;
214     abi_ulong retcode;
215 
216     int thumb;
217     int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
218 
219     if (is_fdpic) {
220         /* In FDPIC mode, ka->_sa_handler points to a function
221          * descriptor (FD). The first word contains the address of the
222          * handler. The second word contains the value of the PIC
223          * register (r9).  */
224         abi_ulong funcdesc_ptr = ka->_sa_handler;
225         if (get_user_ual(handler, funcdesc_ptr)
226             || get_user_ual(handler_fdpic_GOT, funcdesc_ptr + 4)) {
227             return 1;
228         }
229     } else {
230         handler = ka->_sa_handler;
231     }
232 
233     thumb = handler & 1;
234 
235     uint32_t cpsr = cpsr_read(env);
236 
237     cpsr &= ~CPSR_IT;
238     if (thumb) {
239         cpsr |= CPSR_T;
240     } else {
241         cpsr &= ~CPSR_T;
242     }
243     if (env->cp15.sctlr_el[1] & SCTLR_E0E) {
244         cpsr |= CPSR_E;
245     } else {
246         cpsr &= ~CPSR_E;
247     }
248 
249     if (ka->sa_flags & TARGET_SA_RESTORER) {
250         if (is_fdpic) {
251             /* For FDPIC we ensure that the restorer is called with a
252              * correct r9 value.  For that we need to write code on
253              * the stack that sets r9 and jumps back to restorer
254              * value.
255              */
256             if (thumb) {
257                 __put_user(sigreturn_fdpic_thumb_codes[0], rc);
258                 __put_user(sigreturn_fdpic_thumb_codes[1], rc + 1);
259                 __put_user(sigreturn_fdpic_thumb_codes[2], rc + 2);
260                 __put_user((abi_ulong)ka->sa_restorer, rc + 3);
261             } else {
262                 __put_user(sigreturn_fdpic_codes[0], rc);
263                 __put_user(sigreturn_fdpic_codes[1], rc + 1);
264                 __put_user(sigreturn_fdpic_codes[2], rc + 2);
265                 __put_user((abi_ulong)ka->sa_restorer, rc + 3);
266             }
267 
268             retcode = rc_addr + thumb;
269         } else {
270             retcode = ka->sa_restorer;
271         }
272     } else {
273         unsigned int idx = thumb;
274 
275         if (ka->sa_flags & TARGET_SA_SIGINFO) {
276             idx += 2;
277         }
278 
279         __put_user(retcodes[idx], rc);
280 
281         retcode = rc_addr + thumb;
282     }
283 
284     env->regs[0] = usig;
285     if (is_fdpic) {
286         env->regs[9] = handler_fdpic_GOT;
287     }
288     env->regs[13] = frame_addr;
289     env->regs[14] = retcode;
290     env->regs[15] = handler & (thumb ? ~1 : ~3);
291     cpsr_write(env, cpsr, CPSR_IT | CPSR_T | CPSR_E, CPSRWriteByInstr);
292 
293     return 0;
294 }
295 
296 static abi_ulong *setup_sigframe_v2_vfp(abi_ulong *regspace, CPUARMState *env)
297 {
298     int i;
299     struct target_vfp_sigframe *vfpframe;
300     vfpframe = (struct target_vfp_sigframe *)regspace;
301     __put_user(TARGET_VFP_MAGIC, &vfpframe->magic);
302     __put_user(sizeof(*vfpframe), &vfpframe->size);
303     for (i = 0; i < 32; i++) {
304         __put_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
305     }
306     __put_user(vfp_get_fpscr(env), &vfpframe->ufp.fpscr);
307     __put_user(env->vfp.xregs[ARM_VFP_FPEXC], &vfpframe->ufp_exc.fpexc);
308     __put_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
309     __put_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
310     return (abi_ulong*)(vfpframe+1);
311 }
312 
313 static abi_ulong *setup_sigframe_v2_iwmmxt(abi_ulong *regspace,
314                                            CPUARMState *env)
315 {
316     int i;
317     struct target_iwmmxt_sigframe *iwmmxtframe;
318     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
319     __put_user(TARGET_IWMMXT_MAGIC, &iwmmxtframe->magic);
320     __put_user(sizeof(*iwmmxtframe), &iwmmxtframe->size);
321     for (i = 0; i < 16; i++) {
322         __put_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
323     }
324     __put_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
325     __put_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
326     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
327     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
328     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
329     __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
330     return (abi_ulong*)(iwmmxtframe+1);
331 }
332 
333 static void setup_sigframe_v2(struct target_ucontext_v2 *uc,
334                               target_sigset_t *set, CPUARMState *env)
335 {
336     struct target_sigaltstack stack;
337     int i;
338     abi_ulong *regspace;
339 
340     /* Clear all the bits of the ucontext we don't use.  */
341     memset(uc, 0, offsetof(struct target_ucontext_v2, tuc_mcontext));
342 
343     memset(&stack, 0, sizeof(stack));
344     target_save_altstack(&stack, env);
345     memcpy(&uc->tuc_stack, &stack, sizeof(stack));
346 
347     setup_sigcontext(&uc->tuc_mcontext, env, set->sig[0]);
348     /* Save coprocessor signal frame.  */
349     regspace = uc->tuc_regspace;
350     if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) {
351         regspace = setup_sigframe_v2_vfp(regspace, env);
352     }
353     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
354         regspace = setup_sigframe_v2_iwmmxt(regspace, env);
355     }
356 
357     /* Write terminating magic word */
358     __put_user(0, regspace);
359 
360     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
361         __put_user(set->sig[i], &uc->tuc_sigmask.sig[i]);
362     }
363 }
364 
365 /* compare linux/arch/arm/kernel/signal.c:setup_frame() */
366 static void setup_frame_v1(int usig, struct target_sigaction *ka,
367                            target_sigset_t *set, CPUARMState *regs)
368 {
369     struct sigframe_v1 *frame;
370     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
371     int i;
372 
373     trace_user_setup_frame(regs, frame_addr);
374     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
375         goto sigsegv;
376     }
377 
378     setup_sigcontext(&frame->sc, regs, set->sig[0]);
379 
380     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
381         __put_user(set->sig[i], &frame->extramask[i - 1]);
382     }
383 
384     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
385                      frame_addr + offsetof(struct sigframe_v1, retcode))) {
386         goto sigsegv;
387     }
388 
389     unlock_user_struct(frame, frame_addr, 1);
390     return;
391 sigsegv:
392     unlock_user_struct(frame, frame_addr, 1);
393     force_sigsegv(usig);
394 }
395 
396 static void setup_frame_v2(int usig, struct target_sigaction *ka,
397                            target_sigset_t *set, CPUARMState *regs)
398 {
399     struct sigframe_v2 *frame;
400     abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
401 
402     trace_user_setup_frame(regs, frame_addr);
403     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
404         goto sigsegv;
405     }
406 
407     setup_sigframe_v2(&frame->uc, set, regs);
408 
409     if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
410                      frame_addr + offsetof(struct sigframe_v2, retcode))) {
411         goto sigsegv;
412     }
413 
414     unlock_user_struct(frame, frame_addr, 1);
415     return;
416 sigsegv:
417     unlock_user_struct(frame, frame_addr, 1);
418     force_sigsegv(usig);
419 }
420 
421 void setup_frame(int usig, struct target_sigaction *ka,
422                  target_sigset_t *set, CPUARMState *regs)
423 {
424     if (get_osversion() >= 0x020612) {
425         setup_frame_v2(usig, ka, set, regs);
426     } else {
427         setup_frame_v1(usig, ka, set, regs);
428     }
429 }
430 
431 /* compare linux/arch/arm/kernel/signal.c:setup_rt_frame() */
432 static void setup_rt_frame_v1(int usig, struct target_sigaction *ka,
433                               target_siginfo_t *info,
434                               target_sigset_t *set, CPUARMState *env)
435 {
436     struct rt_sigframe_v1 *frame;
437     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
438     struct target_sigaltstack stack;
439     int i;
440     abi_ulong info_addr, uc_addr;
441 
442     trace_user_setup_rt_frame(env, frame_addr);
443     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
444         goto sigsegv;
445     }
446 
447     info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info);
448     __put_user(info_addr, &frame->pinfo);
449     uc_addr = frame_addr + offsetof(struct rt_sigframe_v1, uc);
450     __put_user(uc_addr, &frame->puc);
451     tswap_siginfo(&frame->info, info);
452 
453     /* Clear all the bits of the ucontext we don't use.  */
454     memset(&frame->uc, 0, offsetof(struct target_ucontext_v1, tuc_mcontext));
455 
456     memset(&stack, 0, sizeof(stack));
457     target_save_altstack(&stack, env);
458     memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
459 
460     setup_sigcontext(&frame->uc.tuc_mcontext, env, set->sig[0]);
461     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
462         __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
463     }
464 
465     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
466                      frame_addr + offsetof(struct rt_sigframe_v1, retcode))) {
467         goto sigsegv;
468     }
469 
470     env->regs[1] = info_addr;
471     env->regs[2] = uc_addr;
472 
473     unlock_user_struct(frame, frame_addr, 1);
474     return;
475 sigsegv:
476     unlock_user_struct(frame, frame_addr, 1);
477     force_sigsegv(usig);
478 }
479 
480 static void setup_rt_frame_v2(int usig, struct target_sigaction *ka,
481                               target_siginfo_t *info,
482                               target_sigset_t *set, CPUARMState *env)
483 {
484     struct rt_sigframe_v2 *frame;
485     abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
486     abi_ulong info_addr, uc_addr;
487 
488     trace_user_setup_rt_frame(env, frame_addr);
489     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
490         goto sigsegv;
491     }
492 
493     info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info);
494     uc_addr = frame_addr + offsetof(struct rt_sigframe_v2, uc);
495     tswap_siginfo(&frame->info, info);
496 
497     setup_sigframe_v2(&frame->uc, set, env);
498 
499     if (setup_return(env, ka, frame->retcode, frame_addr, usig,
500                      frame_addr + offsetof(struct rt_sigframe_v2, retcode))) {
501         goto sigsegv;
502     }
503 
504     env->regs[1] = info_addr;
505     env->regs[2] = uc_addr;
506 
507     unlock_user_struct(frame, frame_addr, 1);
508     return;
509 sigsegv:
510     unlock_user_struct(frame, frame_addr, 1);
511     force_sigsegv(usig);
512 }
513 
514 void setup_rt_frame(int usig, struct target_sigaction *ka,
515                     target_siginfo_t *info,
516                     target_sigset_t *set, CPUARMState *env)
517 {
518     if (get_osversion() >= 0x020612) {
519         setup_rt_frame_v2(usig, ka, info, set, env);
520     } else {
521         setup_rt_frame_v1(usig, ka, info, set, env);
522     }
523 }
524 
525 static int
526 restore_sigcontext(CPUARMState *env, struct target_sigcontext *sc)
527 {
528     int err = 0;
529     uint32_t cpsr;
530 
531     __get_user(env->regs[0], &sc->arm_r0);
532     __get_user(env->regs[1], &sc->arm_r1);
533     __get_user(env->regs[2], &sc->arm_r2);
534     __get_user(env->regs[3], &sc->arm_r3);
535     __get_user(env->regs[4], &sc->arm_r4);
536     __get_user(env->regs[5], &sc->arm_r5);
537     __get_user(env->regs[6], &sc->arm_r6);
538     __get_user(env->regs[7], &sc->arm_r7);
539     __get_user(env->regs[8], &sc->arm_r8);
540     __get_user(env->regs[9], &sc->arm_r9);
541     __get_user(env->regs[10], &sc->arm_r10);
542     __get_user(env->regs[11], &sc->arm_fp);
543     __get_user(env->regs[12], &sc->arm_ip);
544     __get_user(env->regs[13], &sc->arm_sp);
545     __get_user(env->regs[14], &sc->arm_lr);
546     __get_user(env->regs[15], &sc->arm_pc);
547     __get_user(cpsr, &sc->arm_cpsr);
548     cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
549 
550     err |= !valid_user_regs(env);
551 
552     return err;
553 }
554 
555 static long do_sigreturn_v1(CPUARMState *env)
556 {
557     abi_ulong frame_addr;
558     struct sigframe_v1 *frame = NULL;
559     target_sigset_t set;
560     sigset_t host_set;
561     int i;
562 
563     /*
564      * Since we stacked the signal on a 64-bit boundary,
565      * then 'sp' should be word aligned here.  If it's
566      * not, then the user is trying to mess with us.
567      */
568     frame_addr = env->regs[13];
569     trace_user_do_sigreturn(env, frame_addr);
570     if (frame_addr & 7) {
571         goto badframe;
572     }
573 
574     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
575         goto badframe;
576     }
577 
578     __get_user(set.sig[0], &frame->sc.oldmask);
579     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
580         __get_user(set.sig[i], &frame->extramask[i - 1]);
581     }
582 
583     target_to_host_sigset_internal(&host_set, &set);
584     set_sigmask(&host_set);
585 
586     if (restore_sigcontext(env, &frame->sc)) {
587         goto badframe;
588     }
589 
590 #if 0
591     /* Send SIGTRAP if we're single-stepping */
592     if (ptrace_cancel_bpt(current))
593         send_sig(SIGTRAP, current, 1);
594 #endif
595     unlock_user_struct(frame, frame_addr, 0);
596     return -TARGET_QEMU_ESIGRETURN;
597 
598 badframe:
599     force_sig(TARGET_SIGSEGV);
600     return -TARGET_QEMU_ESIGRETURN;
601 }
602 
603 static abi_ulong *restore_sigframe_v2_vfp(CPUARMState *env, abi_ulong *regspace)
604 {
605     int i;
606     abi_ulong magic, sz;
607     uint32_t fpscr, fpexc;
608     struct target_vfp_sigframe *vfpframe;
609     vfpframe = (struct target_vfp_sigframe *)regspace;
610 
611     __get_user(magic, &vfpframe->magic);
612     __get_user(sz, &vfpframe->size);
613     if (magic != TARGET_VFP_MAGIC || sz != sizeof(*vfpframe)) {
614         return 0;
615     }
616     for (i = 0; i < 32; i++) {
617         __get_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
618     }
619     __get_user(fpscr, &vfpframe->ufp.fpscr);
620     vfp_set_fpscr(env, fpscr);
621     __get_user(fpexc, &vfpframe->ufp_exc.fpexc);
622     /* Sanitise FPEXC: ensure VFP is enabled, FPINST2 is invalid
623      * and the exception flag is cleared
624      */
625     fpexc |= (1 << 30);
626     fpexc &= ~((1 << 31) | (1 << 28));
627     env->vfp.xregs[ARM_VFP_FPEXC] = fpexc;
628     __get_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
629     __get_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
630     return (abi_ulong*)(vfpframe + 1);
631 }
632 
633 static abi_ulong *restore_sigframe_v2_iwmmxt(CPUARMState *env,
634                                              abi_ulong *regspace)
635 {
636     int i;
637     abi_ulong magic, sz;
638     struct target_iwmmxt_sigframe *iwmmxtframe;
639     iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
640 
641     __get_user(magic, &iwmmxtframe->magic);
642     __get_user(sz, &iwmmxtframe->size);
643     if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) {
644         return 0;
645     }
646     for (i = 0; i < 16; i++) {
647         __get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
648     }
649     __get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
650     __get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
651     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
652     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
653     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
654     __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
655     return (abi_ulong*)(iwmmxtframe + 1);
656 }
657 
658 static int do_sigframe_return_v2(CPUARMState *env,
659                                  target_ulong context_addr,
660                                  struct target_ucontext_v2 *uc)
661 {
662     sigset_t host_set;
663     abi_ulong *regspace;
664 
665     target_to_host_sigset(&host_set, &uc->tuc_sigmask);
666     set_sigmask(&host_set);
667 
668     if (restore_sigcontext(env, &uc->tuc_mcontext))
669         return 1;
670 
671     /* Restore coprocessor signal frame */
672     regspace = uc->tuc_regspace;
673     if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) {
674         regspace = restore_sigframe_v2_vfp(env, regspace);
675         if (!regspace) {
676             return 1;
677         }
678     }
679     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
680         regspace = restore_sigframe_v2_iwmmxt(env, regspace);
681         if (!regspace) {
682             return 1;
683         }
684     }
685 
686     target_restore_altstack(&uc->tuc_stack, env);
687 
688 #if 0
689     /* Send SIGTRAP if we're single-stepping */
690     if (ptrace_cancel_bpt(current))
691         send_sig(SIGTRAP, current, 1);
692 #endif
693 
694     return 0;
695 }
696 
697 static long do_sigreturn_v2(CPUARMState *env)
698 {
699     abi_ulong frame_addr;
700     struct sigframe_v2 *frame = NULL;
701 
702     /*
703      * Since we stacked the signal on a 64-bit boundary,
704      * then 'sp' should be word aligned here.  If it's
705      * not, then the user is trying to mess with us.
706      */
707     frame_addr = env->regs[13];
708     trace_user_do_sigreturn(env, frame_addr);
709     if (frame_addr & 7) {
710         goto badframe;
711     }
712 
713     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
714         goto badframe;
715     }
716 
717     if (do_sigframe_return_v2(env,
718                               frame_addr
719                               + offsetof(struct sigframe_v2, uc),
720                               &frame->uc)) {
721         goto badframe;
722     }
723 
724     unlock_user_struct(frame, frame_addr, 0);
725     return -TARGET_QEMU_ESIGRETURN;
726 
727 badframe:
728     unlock_user_struct(frame, frame_addr, 0);
729     force_sig(TARGET_SIGSEGV);
730     return -TARGET_QEMU_ESIGRETURN;
731 }
732 
733 long do_sigreturn(CPUARMState *env)
734 {
735     if (get_osversion() >= 0x020612) {
736         return do_sigreturn_v2(env);
737     } else {
738         return do_sigreturn_v1(env);
739     }
740 }
741 
742 static long do_rt_sigreturn_v1(CPUARMState *env)
743 {
744     abi_ulong frame_addr;
745     struct rt_sigframe_v1 *frame = NULL;
746     sigset_t host_set;
747 
748     /*
749      * Since we stacked the signal on a 64-bit boundary,
750      * then 'sp' should be word aligned here.  If it's
751      * not, then the user is trying to mess with us.
752      */
753     frame_addr = env->regs[13];
754     trace_user_do_rt_sigreturn(env, frame_addr);
755     if (frame_addr & 7) {
756         goto badframe;
757     }
758 
759     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
760         goto badframe;
761     }
762 
763     target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
764     set_sigmask(&host_set);
765 
766     if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
767         goto badframe;
768     }
769 
770     target_restore_altstack(&frame->uc.tuc_stack, env);
771 
772 #if 0
773     /* Send SIGTRAP if we're single-stepping */
774     if (ptrace_cancel_bpt(current))
775         send_sig(SIGTRAP, current, 1);
776 #endif
777     unlock_user_struct(frame, frame_addr, 0);
778     return -TARGET_QEMU_ESIGRETURN;
779 
780 badframe:
781     unlock_user_struct(frame, frame_addr, 0);
782     force_sig(TARGET_SIGSEGV);
783     return -TARGET_QEMU_ESIGRETURN;
784 }
785 
786 static long do_rt_sigreturn_v2(CPUARMState *env)
787 {
788     abi_ulong frame_addr;
789     struct rt_sigframe_v2 *frame = NULL;
790 
791     /*
792      * Since we stacked the signal on a 64-bit boundary,
793      * then 'sp' should be word aligned here.  If it's
794      * not, then the user is trying to mess with us.
795      */
796     frame_addr = env->regs[13];
797     trace_user_do_rt_sigreturn(env, frame_addr);
798     if (frame_addr & 7) {
799         goto badframe;
800     }
801 
802     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
803         goto badframe;
804     }
805 
806     if (do_sigframe_return_v2(env,
807                               frame_addr
808                               + offsetof(struct rt_sigframe_v2, uc),
809                               &frame->uc)) {
810         goto badframe;
811     }
812 
813     unlock_user_struct(frame, frame_addr, 0);
814     return -TARGET_QEMU_ESIGRETURN;
815 
816 badframe:
817     unlock_user_struct(frame, frame_addr, 0);
818     force_sig(TARGET_SIGSEGV);
819     return -TARGET_QEMU_ESIGRETURN;
820 }
821 
822 long do_rt_sigreturn(CPUARMState *env)
823 {
824     if (get_osversion() >= 0x020612) {
825         return do_rt_sigreturn_v2(env);
826     } else {
827         return do_rt_sigreturn_v1(env);
828     }
829 }
830