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10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/ptrace.h>
14#include <linux/tracehook.h>
15#include <linux/sched.h>
16#include <linux/signal.h>
17#include <linux/smp.h>
18#include <linux/stddef.h>
19#include <linux/tty.h>
20#include <linux/binfmts.h>
21#include <linux/unistd.h>
22#include <linux/wait.h>
23
24#include <asm/intrinsics.h>
25#include <asm/uaccess.h>
26#include <asm/rse.h>
27#include <asm/sigcontext.h>
28
29#include "sigframe.h"
30
31#define DEBUG_SIG 0
32#define STACK_ALIGN 16
33
34#if _NSIG_WORDS > 1
35# define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
36# define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
37#else
38# define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0])
39# define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0])
40#endif
41
42static long
43restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
44{
45 unsigned long ip, flags, nat, um, cfm, rsc;
46 long err;
47
48
49 current_thread_info()->restart_block.fn = do_no_restart_syscall;
50
51
52 err = __get_user(flags, &sc->sc_flags);
53 err |= __get_user(nat, &sc->sc_nat);
54 err |= __get_user(ip, &sc->sc_ip);
55 err |= __get_user(cfm, &sc->sc_cfm);
56 err |= __get_user(um, &sc->sc_um);
57 err |= __get_user(rsc, &sc->sc_ar_rsc);
58 err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
59 err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
60 err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
61 err |= __get_user(scr->pt.pr, &sc->sc_pr);
62 err |= __get_user(scr->pt.b0, &sc->sc_br[0]);
63 err |= __get_user(scr->pt.b6, &sc->sc_br[6]);
64 err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 8);
65 err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8);
66 err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 2*8);
67 err |= __copy_from_user(&scr->pt.r15, &sc->sc_gr[15], 8);
68
69 scr->pt.cr_ifs = cfm | (1UL << 63);
70 scr->pt.ar_rsc = rsc | (3 << 2);
71
72
73 scr->pt.cr_iip = ip & ~0x3UL;
74 ia64_psr(&scr->pt)->ri = ip & 0x3;
75 scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
76
77 scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
78
79 if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
80
81 err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
82 err |= __get_user(scr->pt.b7, &sc->sc_br[7]);
83 err |= __get_user(scr->pt.r14, &sc->sc_gr[14]);
84 err |= __copy_from_user(&scr->pt.ar_csd, &sc->sc_ar25, 2*8);
85 err |= __copy_from_user(&scr->pt.r2, &sc->sc_gr[2], 2*8);
86 err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8);
87 }
88
89 if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
90 struct ia64_psr *psr = ia64_psr(&scr->pt);
91
92 err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
93 psr->mfh = 0;
94 preempt_disable();
95 if (psr->dfh)
96 ia64_drop_fpu(current);
97 else {
98
99 __ia64_load_fpu(current->thread.fph);
100 ia64_set_local_fpu_owner(current);
101 }
102 preempt_enable();
103 }
104 return err;
105}
106
107int
108copy_siginfo_to_user (siginfo_t __user *to, siginfo_t *from)
109{
110 if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t)))
111 return -EFAULT;
112 if (from->si_code < 0) {
113 if (__copy_to_user(to, from, sizeof(siginfo_t)))
114 return -EFAULT;
115 return 0;
116 } else {
117 int err;
118
119
120
121
122
123
124
125 err = __put_user(from->si_signo, &to->si_signo);
126 err |= __put_user(from->si_errno, &to->si_errno);
127 err |= __put_user((short)from->si_code, &to->si_code);
128 switch (from->si_code >> 16) {
129 case __SI_FAULT >> 16:
130 err |= __put_user(from->si_flags, &to->si_flags);
131 err |= __put_user(from->si_isr, &to->si_isr);
132 case __SI_POLL >> 16:
133 err |= __put_user(from->si_addr, &to->si_addr);
134 err |= __put_user(from->si_imm, &to->si_imm);
135 break;
136 case __SI_TIMER >> 16:
137 err |= __put_user(from->si_tid, &to->si_tid);
138 err |= __put_user(from->si_overrun, &to->si_overrun);
139 err |= __put_user(from->si_ptr, &to->si_ptr);
140 break;
141 case __SI_RT >> 16:
142 case __SI_MESGQ >> 16:
143 err |= __put_user(from->si_uid, &to->si_uid);
144 err |= __put_user(from->si_pid, &to->si_pid);
145 err |= __put_user(from->si_ptr, &to->si_ptr);
146 break;
147 case __SI_CHLD >> 16:
148 err |= __put_user(from->si_utime, &to->si_utime);
149 err |= __put_user(from->si_stime, &to->si_stime);
150 err |= __put_user(from->si_status, &to->si_status);
151 default:
152 err |= __put_user(from->si_uid, &to->si_uid);
153 err |= __put_user(from->si_pid, &to->si_pid);
154 break;
155 }
156 return err;
157 }
158}
159
160long
161ia64_rt_sigreturn (struct sigscratch *scr)
162{
163 extern char ia64_strace_leave_kernel, ia64_leave_kernel;
164 struct sigcontext __user *sc;
165 struct siginfo si;
166 sigset_t set;
167 long retval;
168
169 sc = &((struct sigframe __user *) (scr->pt.r12 + 16))->sc;
170
171
172
173
174
175
176
177 retval = (long) &ia64_leave_kernel;
178 if (test_thread_flag(TIF_SYSCALL_TRACE)
179 || test_thread_flag(TIF_SYSCALL_AUDIT))
180
181
182
183
184
185
186 retval = (long) &ia64_strace_leave_kernel;
187
188 if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
189 goto give_sigsegv;
190
191 if (GET_SIGSET(&set, &sc->sc_mask))
192 goto give_sigsegv;
193
194 set_current_blocked(&set);
195
196 if (restore_sigcontext(sc, scr))
197 goto give_sigsegv;
198
199#if DEBUG_SIG
200 printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
201 current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
202#endif
203 if (restore_altstack(&sc->sc_stack))
204 goto give_sigsegv;
205 return retval;
206
207 give_sigsegv:
208 si.si_signo = SIGSEGV;
209 si.si_errno = 0;
210 si.si_code = SI_KERNEL;
211 si.si_pid = task_pid_vnr(current);
212 si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
213 si.si_addr = sc;
214 force_sig_info(SIGSEGV, &si, current);
215 return retval;
216}
217
218
219
220
221
222
223
224static long
225setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr)
226{
227 unsigned long flags = 0, ifs, cfm, nat;
228 long err = 0;
229
230 ifs = scr->pt.cr_ifs;
231
232 if (on_sig_stack((unsigned long) sc))
233 flags |= IA64_SC_FLAG_ONSTACK;
234 if ((ifs & (1UL << 63)) == 0)
235
236 flags |= IA64_SC_FLAG_IN_SYSCALL;
237 cfm = ifs & ((1UL << 38) - 1);
238 ia64_flush_fph(current);
239 if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
240 flags |= IA64_SC_FLAG_FPH_VALID;
241 err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
242 }
243
244 nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
245
246 err |= __put_user(flags, &sc->sc_flags);
247 err |= __put_user(nat, &sc->sc_nat);
248 err |= PUT_SIGSET(mask, &sc->sc_mask);
249 err |= __put_user(cfm, &sc->sc_cfm);
250 err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
251 err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
252 err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat);
253 err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
254 err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
255 err |= __put_user(scr->pt.pr, &sc->sc_pr);
256 err |= __put_user(scr->pt.b0, &sc->sc_br[0]);
257 err |= __put_user(scr->pt.b6, &sc->sc_br[6]);
258 err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 8);
259 err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8);
260 err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 2*8);
261 err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8);
262 err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
263
264 if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
265
266 err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
267 err |= __put_user(scr->pt.b7, &sc->sc_br[7]);
268 err |= __put_user(scr->pt.r14, &sc->sc_gr[14]);
269 err |= __copy_to_user(&sc->sc_ar25, &scr->pt.ar_csd, 2*8);
270 err |= __copy_to_user(&sc->sc_gr[2], &scr->pt.r2, 2*8);
271 err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8);
272 }
273 return err;
274}
275
276
277
278
279static inline int
280rbs_on_sig_stack (unsigned long bsp)
281{
282 return (bsp - current->sas_ss_sp < current->sas_ss_size);
283}
284
285static long
286force_sigsegv_info (int sig, void __user *addr)
287{
288 unsigned long flags;
289 struct siginfo si;
290
291 if (sig == SIGSEGV) {
292
293
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295
296
297
298
299
300
301 spin_lock_irqsave(¤t->sighand->siglock, flags);
302 current->sighand->action[sig - 1].sa.sa_handler = SIG_DFL;
303 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
304 }
305 si.si_signo = SIGSEGV;
306 si.si_errno = 0;
307 si.si_code = SI_KERNEL;
308 si.si_pid = task_pid_vnr(current);
309 si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
310 si.si_addr = addr;
311 force_sig_info(SIGSEGV, &si, current);
312 return 0;
313}
314
315static long
316setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
317 struct sigscratch *scr)
318{
319 extern char __kernel_sigtramp[];
320 unsigned long tramp_addr, new_rbs = 0, new_sp;
321 struct sigframe __user *frame;
322 long err;
323
324 new_sp = scr->pt.r12;
325 tramp_addr = (unsigned long) __kernel_sigtramp;
326 if (ka->sa.sa_flags & SA_ONSTACK) {
327 int onstack = sas_ss_flags(new_sp);
328
329 if (onstack == 0) {
330 new_sp = current->sas_ss_sp + current->sas_ss_size;
331
332
333
334
335
336
337 if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
338 new_rbs = ALIGN(current->sas_ss_sp,
339 sizeof(long));
340 } else if (onstack == SS_ONSTACK) {
341 unsigned long check_sp;
342
343
344
345
346
347
348 check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
349 if (!likely(on_sig_stack(check_sp)))
350 return force_sigsegv_info(sig, (void __user *)
351 check_sp);
352 }
353 }
354 frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);
355
356 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
357 return force_sigsegv_info(sig, frame);
358
359 err = __put_user(sig, &frame->arg0);
360 err |= __put_user(&frame->info, &frame->arg1);
361 err |= __put_user(&frame->sc, &frame->arg2);
362 err |= __put_user(new_rbs, &frame->sc.sc_rbs_base);
363 err |= __put_user(0, &frame->sc.sc_loadrs);
364 err |= __put_user(ka->sa.sa_handler, &frame->handler);
365
366 err |= copy_siginfo_to_user(&frame->info, info);
367
368 err |= __save_altstack(&frame->sc.sc_stack, scr->pt.r12);
369 err |= setup_sigcontext(&frame->sc, set, scr);
370
371 if (unlikely(err))
372 return force_sigsegv_info(sig, frame);
373
374 scr->pt.r12 = (unsigned long) frame - 16;
375 scr->pt.ar_fpsr = FPSR_DEFAULT;
376 scr->pt.cr_iip = tramp_addr;
377 ia64_psr(&scr->pt)->ri = 0;
378 ia64_psr(&scr->pt)->be = 0;
379
380
381
382
383
384
385
386
387 scr->pt.cr_ifs = (1UL << 63);
388
389
390
391
392
393 scr->scratch_unat = 0;
394
395#if DEBUG_SIG
396 printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n",
397 current->comm, current->pid, sig, scr->pt.r12, frame->sc.sc_ip, frame->handler);
398#endif
399 return 1;
400}
401
402static long
403handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
404 struct sigscratch *scr)
405{
406 if (!setup_frame(sig, ka, info, sigmask_to_save(), scr))
407 return 0;
408
409 signal_delivered(sig, info, ka, &scr->pt,
410 test_thread_flag(TIF_SINGLESTEP));
411
412 return 1;
413}
414
415
416
417
418
419void
420ia64_do_signal (struct sigscratch *scr, long in_syscall)
421{
422 struct k_sigaction ka;
423 siginfo_t info;
424 long restart = in_syscall;
425 long errno = scr->pt.r8;
426
427
428
429
430
431 while (1) {
432 int signr = get_signal_to_deliver(&info, &ka, &scr->pt, NULL);
433
434
435
436
437
438
439
440 if ((long) scr->pt.r10 != -1)
441
442
443
444
445
446
447 restart = 0;
448
449 if (signr <= 0)
450 break;
451
452 if (unlikely(restart)) {
453 switch (errno) {
454 case ERESTART_RESTARTBLOCK:
455 case ERESTARTNOHAND:
456 scr->pt.r8 = EINTR;
457
458 break;
459
460 case ERESTARTSYS:
461 if ((ka.sa.sa_flags & SA_RESTART) == 0) {
462 scr->pt.r8 = EINTR;
463
464 break;
465 }
466 case ERESTARTNOINTR:
467 ia64_decrement_ip(&scr->pt);
468 restart = 0;
469 }
470 }
471
472
473
474
475
476 if (handle_signal(signr, &ka, &info, scr))
477 return;
478 }
479
480
481 if (restart) {
482
483 if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR
484 || errno == ERESTART_RESTARTBLOCK)
485 {
486
487
488
489
490
491 ia64_decrement_ip(&scr->pt);
492 if (errno == ERESTART_RESTARTBLOCK)
493 scr->pt.r15 = __NR_restart_syscall;
494 }
495 }
496
497
498
499 restore_saved_sigmask();
500}
501