]>
git.proxmox.com Git - mirror_ubuntu-kernels.git/blob - arch/ia64/kernel/signal.c
2 * Architecture-specific signal handling support.
4 * Copyright (C) 1999-2004 Hewlett-Packard Co
5 * David Mosberger-Tang <davidm@hpl.hp.com>
7 * Derived from i386 and Alpha versions.
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
13 #include <linux/ptrace.h>
14 #include <linux/sched.h>
15 #include <linux/signal.h>
16 #include <linux/smp.h>
17 #include <linux/stddef.h>
18 #include <linux/tty.h>
19 #include <linux/binfmts.h>
20 #include <linux/unistd.h>
21 #include <linux/wait.h>
24 #include <asm/intrinsics.h>
25 #include <asm/uaccess.h>
27 #include <asm/sigcontext.h>
32 #define STACK_ALIGN 16 /* minimal alignment for stack pointer */
33 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
36 # define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
37 # define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
39 # define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0])
40 # define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0])
44 ia64_rt_sigsuspend (sigset_t __user
*uset
, size_t sigsetsize
, struct sigscratch
*scr
)
48 /* XXX: Don't preclude handling different sized sigset_t's. */
49 if (sigsetsize
!= sizeof(sigset_t
))
52 if (!access_ok(VERIFY_READ
, uset
, sigsetsize
))
55 if (GET_SIGSET(&set
, uset
))
58 sigdelsetmask(&set
, ~_BLOCKABLE
);
60 spin_lock_irq(¤t
->sighand
->siglock
);
62 oldset
= current
->blocked
;
63 current
->blocked
= set
;
66 spin_unlock_irq(¤t
->sighand
->siglock
);
69 * The return below usually returns to the signal handler. We need to
70 * pre-set the correct error code here to ensure that the right values
71 * get saved in sigcontext by ia64_do_signal.
77 current
->state
= TASK_INTERRUPTIBLE
;
79 if (ia64_do_signal(&oldset
, scr
, 1))
85 sys_sigaltstack (const stack_t __user
*uss
, stack_t __user
*uoss
, long arg2
,
86 long arg3
, long arg4
, long arg5
, long arg6
, long arg7
,
89 return do_sigaltstack(uss
, uoss
, regs
.r12
);
93 restore_sigcontext (struct sigcontext __user
*sc
, struct sigscratch
*scr
)
95 unsigned long ip
, flags
, nat
, um
, cfm
, rsc
;
98 /* Always make any pending restarted system calls return -EINTR */
99 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
101 /* restore scratch that always needs gets updated during signal delivery: */
102 err
= __get_user(flags
, &sc
->sc_flags
);
103 err
|= __get_user(nat
, &sc
->sc_nat
);
104 err
|= __get_user(ip
, &sc
->sc_ip
); /* instruction pointer */
105 err
|= __get_user(cfm
, &sc
->sc_cfm
);
106 err
|= __get_user(um
, &sc
->sc_um
); /* user mask */
107 err
|= __get_user(rsc
, &sc
->sc_ar_rsc
);
108 err
|= __get_user(scr
->pt
.ar_unat
, &sc
->sc_ar_unat
);
109 err
|= __get_user(scr
->pt
.ar_fpsr
, &sc
->sc_ar_fpsr
);
110 err
|= __get_user(scr
->pt
.ar_pfs
, &sc
->sc_ar_pfs
);
111 err
|= __get_user(scr
->pt
.pr
, &sc
->sc_pr
); /* predicates */
112 err
|= __get_user(scr
->pt
.b0
, &sc
->sc_br
[0]); /* b0 (rp) */
113 err
|= __get_user(scr
->pt
.b6
, &sc
->sc_br
[6]); /* b6 */
114 err
|= __copy_from_user(&scr
->pt
.r1
, &sc
->sc_gr
[1], 8); /* r1 */
115 err
|= __copy_from_user(&scr
->pt
.r8
, &sc
->sc_gr
[8], 4*8); /* r8-r11 */
116 err
|= __copy_from_user(&scr
->pt
.r12
, &sc
->sc_gr
[12], 2*8); /* r12-r13 */
117 err
|= __copy_from_user(&scr
->pt
.r15
, &sc
->sc_gr
[15], 8); /* r15 */
119 scr
->pt
.cr_ifs
= cfm
| (1UL << 63);
120 scr
->pt
.ar_rsc
= rsc
| (3 << 2); /* force PL3 */
122 /* establish new instruction pointer: */
123 scr
->pt
.cr_iip
= ip
& ~0x3UL
;
124 ia64_psr(&scr
->pt
)->ri
= ip
& 0x3;
125 scr
->pt
.cr_ipsr
= (scr
->pt
.cr_ipsr
& ~IA64_PSR_UM
) | (um
& IA64_PSR_UM
);
127 scr
->scratch_unat
= ia64_put_scratch_nat_bits(&scr
->pt
, nat
);
129 if (!(flags
& IA64_SC_FLAG_IN_SYSCALL
)) {
130 /* Restore most scratch-state only when not in syscall. */
131 err
|= __get_user(scr
->pt
.ar_ccv
, &sc
->sc_ar_ccv
); /* ar.ccv */
132 err
|= __get_user(scr
->pt
.b7
, &sc
->sc_br
[7]); /* b7 */
133 err
|= __get_user(scr
->pt
.r14
, &sc
->sc_gr
[14]); /* r14 */
134 err
|= __copy_from_user(&scr
->pt
.ar_csd
, &sc
->sc_ar25
, 2*8); /* ar.csd & ar.ssd */
135 err
|= __copy_from_user(&scr
->pt
.r2
, &sc
->sc_gr
[2], 2*8); /* r2-r3 */
136 err
|= __copy_from_user(&scr
->pt
.r16
, &sc
->sc_gr
[16], 16*8); /* r16-r31 */
139 if ((flags
& IA64_SC_FLAG_FPH_VALID
) != 0) {
140 struct ia64_psr
*psr
= ia64_psr(&scr
->pt
);
142 __copy_from_user(current
->thread
.fph
, &sc
->sc_fr
[32], 96*16);
143 psr
->mfh
= 0; /* drop signal handler's fph contents... */
146 ia64_drop_fpu(current
);
148 /* We already own the local fph, otherwise psr->dfh wouldn't be 0. */
149 __ia64_load_fpu(current
->thread
.fph
);
150 ia64_set_local_fpu_owner(current
);
158 copy_siginfo_to_user (siginfo_t __user
*to
, siginfo_t
*from
)
160 if (!access_ok(VERIFY_WRITE
, to
, sizeof(siginfo_t
)))
162 if (from
->si_code
< 0) {
163 if (__copy_to_user(to
, from
, sizeof(siginfo_t
)))
170 * If you change siginfo_t structure, please be sure this code is fixed
171 * accordingly. It should never copy any pad contained in the structure
172 * to avoid security leaks, but must copy the generic 3 ints plus the
173 * relevant union member.
175 err
= __put_user(from
->si_signo
, &to
->si_signo
);
176 err
|= __put_user(from
->si_errno
, &to
->si_errno
);
177 err
|= __put_user((short)from
->si_code
, &to
->si_code
);
178 switch (from
->si_code
>> 16) {
179 case __SI_FAULT
>> 16:
180 err
|= __put_user(from
->si_flags
, &to
->si_flags
);
181 err
|= __put_user(from
->si_isr
, &to
->si_isr
);
182 case __SI_POLL
>> 16:
183 err
|= __put_user(from
->si_addr
, &to
->si_addr
);
184 err
|= __put_user(from
->si_imm
, &to
->si_imm
);
186 case __SI_TIMER
>> 16:
187 err
|= __put_user(from
->si_tid
, &to
->si_tid
);
188 err
|= __put_user(from
->si_overrun
, &to
->si_overrun
);
189 err
|= __put_user(from
->si_ptr
, &to
->si_ptr
);
191 case __SI_RT
>> 16: /* Not generated by the kernel as of now. */
192 case __SI_MESGQ
>> 16:
193 err
|= __put_user(from
->si_uid
, &to
->si_uid
);
194 err
|= __put_user(from
->si_pid
, &to
->si_pid
);
195 err
|= __put_user(from
->si_ptr
, &to
->si_ptr
);
197 case __SI_CHLD
>> 16:
198 err
|= __put_user(from
->si_utime
, &to
->si_utime
);
199 err
|= __put_user(from
->si_stime
, &to
->si_stime
);
200 err
|= __put_user(from
->si_status
, &to
->si_status
);
202 err
|= __put_user(from
->si_uid
, &to
->si_uid
);
203 err
|= __put_user(from
->si_pid
, &to
->si_pid
);
211 ia64_rt_sigreturn (struct sigscratch
*scr
)
213 extern char ia64_strace_leave_kernel
, ia64_leave_kernel
;
214 struct sigcontext __user
*sc
;
219 sc
= &((struct sigframe __user
*) (scr
->pt
.r12
+ 16))->sc
;
222 * When we return to the previously executing context, r8 and r10 have already
223 * been setup the way we want them. Indeed, if the signal wasn't delivered while
224 * in a system call, we must not touch r8 or r10 as otherwise user-level state
225 * could be corrupted.
227 retval
= (long) &ia64_leave_kernel
;
228 if (test_thread_flag(TIF_SYSCALL_TRACE
)
229 || test_thread_flag(TIF_SYSCALL_AUDIT
))
231 * strace expects to be notified after sigreturn returns even though the
232 * context to which we return may not be in the middle of a syscall.
233 * Thus, the return-value that strace displays for sigreturn is
236 retval
= (long) &ia64_strace_leave_kernel
;
238 if (!access_ok(VERIFY_READ
, sc
, sizeof(*sc
)))
241 if (GET_SIGSET(&set
, &sc
->sc_mask
))
244 sigdelsetmask(&set
, ~_BLOCKABLE
);
246 spin_lock_irq(¤t
->sighand
->siglock
);
248 current
->blocked
= set
;
251 spin_unlock_irq(¤t
->sighand
->siglock
);
253 if (restore_sigcontext(sc
, scr
))
257 printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
258 current
->comm
, current
->pid
, scr
->pt
.r12
, scr
->pt
.cr_iip
);
261 * It is more difficult to avoid calling this function than to
262 * call it and ignore errors.
264 do_sigaltstack(&sc
->sc_stack
, NULL
, scr
->pt
.r12
);
268 si
.si_signo
= SIGSEGV
;
270 si
.si_code
= SI_KERNEL
;
271 si
.si_pid
= current
->pid
;
272 si
.si_uid
= current
->uid
;
274 force_sig_info(SIGSEGV
, &si
, current
);
279 * This does just the minimum required setup of sigcontext.
280 * Specifically, it only installs data that is either not knowable at
281 * the user-level or that gets modified before execution in the
282 * trampoline starts. Everything else is done at the user-level.
285 setup_sigcontext (struct sigcontext __user
*sc
, sigset_t
*mask
, struct sigscratch
*scr
)
287 unsigned long flags
= 0, ifs
, cfm
, nat
;
290 ifs
= scr
->pt
.cr_ifs
;
292 if (on_sig_stack((unsigned long) sc
))
293 flags
|= IA64_SC_FLAG_ONSTACK
;
294 if ((ifs
& (1UL << 63)) == 0)
295 /* if cr_ifs doesn't have the valid bit set, we got here through a syscall */
296 flags
|= IA64_SC_FLAG_IN_SYSCALL
;
297 cfm
= ifs
& ((1UL << 38) - 1);
298 ia64_flush_fph(current
);
299 if ((current
->thread
.flags
& IA64_THREAD_FPH_VALID
)) {
300 flags
|= IA64_SC_FLAG_FPH_VALID
;
301 __copy_to_user(&sc
->sc_fr
[32], current
->thread
.fph
, 96*16);
304 nat
= ia64_get_scratch_nat_bits(&scr
->pt
, scr
->scratch_unat
);
306 err
= __put_user(flags
, &sc
->sc_flags
);
307 err
|= __put_user(nat
, &sc
->sc_nat
);
308 err
|= PUT_SIGSET(mask
, &sc
->sc_mask
);
309 err
|= __put_user(cfm
, &sc
->sc_cfm
);
310 err
|= __put_user(scr
->pt
.cr_ipsr
& IA64_PSR_UM
, &sc
->sc_um
);
311 err
|= __put_user(scr
->pt
.ar_rsc
, &sc
->sc_ar_rsc
);
312 err
|= __put_user(scr
->pt
.ar_unat
, &sc
->sc_ar_unat
); /* ar.unat */
313 err
|= __put_user(scr
->pt
.ar_fpsr
, &sc
->sc_ar_fpsr
); /* ar.fpsr */
314 err
|= __put_user(scr
->pt
.ar_pfs
, &sc
->sc_ar_pfs
);
315 err
|= __put_user(scr
->pt
.pr
, &sc
->sc_pr
); /* predicates */
316 err
|= __put_user(scr
->pt
.b0
, &sc
->sc_br
[0]); /* b0 (rp) */
317 err
|= __put_user(scr
->pt
.b6
, &sc
->sc_br
[6]); /* b6 */
318 err
|= __copy_to_user(&sc
->sc_gr
[1], &scr
->pt
.r1
, 8); /* r1 */
319 err
|= __copy_to_user(&sc
->sc_gr
[8], &scr
->pt
.r8
, 4*8); /* r8-r11 */
320 err
|= __copy_to_user(&sc
->sc_gr
[12], &scr
->pt
.r12
, 2*8); /* r12-r13 */
321 err
|= __copy_to_user(&sc
->sc_gr
[15], &scr
->pt
.r15
, 8); /* r15 */
322 err
|= __put_user(scr
->pt
.cr_iip
+ ia64_psr(&scr
->pt
)->ri
, &sc
->sc_ip
);
324 if (flags
& IA64_SC_FLAG_IN_SYSCALL
) {
325 /* Clear scratch registers if the signal interrupted a system call. */
326 err
|= __put_user(0, &sc
->sc_ar_ccv
); /* ar.ccv */
327 err
|= __put_user(0, &sc
->sc_br
[7]); /* b7 */
328 err
|= __put_user(0, &sc
->sc_gr
[14]); /* r14 */
329 err
|= __clear_user(&sc
->sc_ar25
, 2*8); /* ar.csd & ar.ssd */
330 err
|= __clear_user(&sc
->sc_gr
[2], 2*8); /* r2-r3 */
331 err
|= __clear_user(&sc
->sc_gr
[16], 16*8); /* r16-r31 */
333 /* Copy scratch regs to sigcontext if the signal didn't interrupt a syscall. */
334 err
|= __put_user(scr
->pt
.ar_ccv
, &sc
->sc_ar_ccv
); /* ar.ccv */
335 err
|= __put_user(scr
->pt
.b7
, &sc
->sc_br
[7]); /* b7 */
336 err
|= __put_user(scr
->pt
.r14
, &sc
->sc_gr
[14]); /* r14 */
337 err
|= __copy_to_user(&sc
->sc_ar25
, &scr
->pt
.ar_csd
, 2*8); /* ar.csd & ar.ssd */
338 err
|= __copy_to_user(&sc
->sc_gr
[2], &scr
->pt
.r2
, 2*8); /* r2-r3 */
339 err
|= __copy_to_user(&sc
->sc_gr
[16], &scr
->pt
.r16
, 16*8); /* r16-r31 */
345 * Check whether the register-backing store is already on the signal stack.
348 rbs_on_sig_stack (unsigned long bsp
)
350 return (bsp
- current
->sas_ss_sp
< current
->sas_ss_size
);
354 force_sigsegv_info (int sig
, void __user
*addr
)
359 if (sig
== SIGSEGV
) {
361 * Acquiring siglock around the sa_handler-update is almost
362 * certainly overkill, but this isn't a
363 * performance-critical path and I'd rather play it safe
364 * here than having to debug a nasty race if and when
365 * something changes in kernel/signal.c that would make it
366 * no longer safe to modify sa_handler without holding the
369 spin_lock_irqsave(¤t
->sighand
->siglock
, flags
);
370 current
->sighand
->action
[sig
- 1].sa
.sa_handler
= SIG_DFL
;
371 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
373 si
.si_signo
= SIGSEGV
;
375 si
.si_code
= SI_KERNEL
;
376 si
.si_pid
= current
->pid
;
377 si
.si_uid
= current
->uid
;
379 force_sig_info(SIGSEGV
, &si
, current
);
384 setup_frame (int sig
, struct k_sigaction
*ka
, siginfo_t
*info
, sigset_t
*set
,
385 struct sigscratch
*scr
)
387 extern char __kernel_sigtramp
[];
388 unsigned long tramp_addr
, new_rbs
= 0, new_sp
;
389 struct sigframe __user
*frame
;
392 new_sp
= scr
->pt
.r12
;
393 tramp_addr
= (unsigned long) __kernel_sigtramp
;
394 if ((ka
->sa
.sa_flags
& SA_ONSTACK
) && sas_ss_flags(new_sp
) == 0) {
395 new_sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
397 * We need to check for the register stack being on the signal stack
398 * separately, because it's switched separately (memory stack is switched
399 * in the kernel, register stack is switched in the signal trampoline).
401 if (!rbs_on_sig_stack(scr
->pt
.ar_bspstore
))
402 new_rbs
= (current
->sas_ss_sp
+ sizeof(long) - 1) & ~(sizeof(long) - 1);
404 frame
= (void __user
*) ((new_sp
- sizeof(*frame
)) & -STACK_ALIGN
);
406 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
407 return force_sigsegv_info(sig
, frame
);
409 err
= __put_user(sig
, &frame
->arg0
);
410 err
|= __put_user(&frame
->info
, &frame
->arg1
);
411 err
|= __put_user(&frame
->sc
, &frame
->arg2
);
412 err
|= __put_user(new_rbs
, &frame
->sc
.sc_rbs_base
);
413 err
|= __put_user(0, &frame
->sc
.sc_loadrs
); /* initialize to zero */
414 err
|= __put_user(ka
->sa
.sa_handler
, &frame
->handler
);
416 err
|= copy_siginfo_to_user(&frame
->info
, info
);
418 err
|= __put_user(current
->sas_ss_sp
, &frame
->sc
.sc_stack
.ss_sp
);
419 err
|= __put_user(current
->sas_ss_size
, &frame
->sc
.sc_stack
.ss_size
);
420 err
|= __put_user(sas_ss_flags(scr
->pt
.r12
), &frame
->sc
.sc_stack
.ss_flags
);
421 err
|= setup_sigcontext(&frame
->sc
, set
, scr
);
424 return force_sigsegv_info(sig
, frame
);
426 scr
->pt
.r12
= (unsigned long) frame
- 16; /* new stack pointer */
427 scr
->pt
.ar_fpsr
= FPSR_DEFAULT
; /* reset fpsr for signal handler */
428 scr
->pt
.cr_iip
= tramp_addr
;
429 ia64_psr(&scr
->pt
)->ri
= 0; /* start executing in first slot */
430 ia64_psr(&scr
->pt
)->be
= 0; /* force little-endian byte-order */
432 * Force the interruption function mask to zero. This has no effect when a
433 * system-call got interrupted by a signal (since, in that case, scr->pt_cr_ifs is
434 * ignored), but it has the desirable effect of making it possible to deliver a
435 * signal with an incomplete register frame (which happens when a mandatory RSE
436 * load faults). Furthermore, it has no negative effect on the getting the user's
437 * dirty partition preserved, because that's governed by scr->pt.loadrs.
439 scr
->pt
.cr_ifs
= (1UL << 63);
442 * Note: this affects only the NaT bits of the scratch regs (the ones saved in
443 * pt_regs), which is exactly what we want.
445 scr
->scratch_unat
= 0; /* ensure NaT bits of r12 is clear */
448 printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n",
449 current
->comm
, current
->pid
, sig
, scr
->pt
.r12
, frame
->sc
.sc_ip
, frame
->handler
);
455 handle_signal (unsigned long sig
, struct k_sigaction
*ka
, siginfo_t
*info
, sigset_t
*oldset
,
456 struct sigscratch
*scr
)
458 if (IS_IA32_PROCESS(&scr
->pt
)) {
459 /* send signal to IA-32 process */
460 if (!ia32_setup_frame1(sig
, ka
, info
, oldset
, &scr
->pt
))
463 /* send signal to IA-64 process */
464 if (!setup_frame(sig
, ka
, info
, oldset
, scr
))
467 spin_lock_irq(¤t
->sighand
->siglock
);
468 sigorsets(¤t
->blocked
, ¤t
->blocked
, &ka
->sa
.sa_mask
);
469 if (!(ka
->sa
.sa_flags
& SA_NODEFER
))
470 sigaddset(¤t
->blocked
, sig
);
472 spin_unlock_irq(¤t
->sighand
->siglock
);
477 * Note that `init' is a special process: it doesn't get signals it doesn't want to
478 * handle. Thus you cannot kill init even with a SIGKILL even by mistake.
481 ia64_do_signal (sigset_t
*oldset
, struct sigscratch
*scr
, long in_syscall
)
483 struct k_sigaction ka
;
485 long restart
= in_syscall
;
486 long errno
= scr
->pt
.r8
;
487 # define ERR_CODE(c) (IS_IA32_PROCESS(&scr->pt) ? -(c) : (c))
490 * In the ia64_leave_kernel code path, we want the common case to go fast, which
491 * is why we may in certain cases get here from kernel mode. Just return without
492 * doing anything if so.
494 if (!user_mode(&scr
->pt
))
498 oldset
= ¤t
->blocked
;
501 * This only loops in the rare cases of handle_signal() failing, in which case we
502 * need to push through a forced SIGSEGV.
505 int signr
= get_signal_to_deliver(&info
, &ka
, &scr
->pt
, NULL
);
508 * get_signal_to_deliver() may have run a debugger (via notify_parent())
509 * and the debugger may have modified the state (e.g., to arrange for an
510 * inferior call), thus it's important to check for restarting _after_
511 * get_signal_to_deliver().
513 if (IS_IA32_PROCESS(&scr
->pt
)) {
520 } else if ((long) scr
->pt
.r10
!= -1)
522 * A system calls has to be restarted only if one of the error codes
523 * ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned. If r10
524 * isn't -1 then r8 doesn't hold an error code and we don't need to
525 * restart the syscall, so we can clear the "restart" flag here.
532 if (unlikely(restart
)) {
534 case ERESTART_RESTARTBLOCK
:
536 scr
->pt
.r8
= ERR_CODE(EINTR
);
537 /* note: scr->pt.r10 is already -1 */
541 if ((ka
.sa
.sa_flags
& SA_RESTART
) == 0) {
542 scr
->pt
.r8
= ERR_CODE(EINTR
);
543 /* note: scr->pt.r10 is already -1 */
547 if (IS_IA32_PROCESS(&scr
->pt
)) {
548 scr
->pt
.r8
= scr
->pt
.r1
;
551 ia64_decrement_ip(&scr
->pt
);
552 restart
= 0; /* don't restart twice if handle_signal() fails... */
557 * Whee! Actually deliver the signal. If the delivery failed, we need to
558 * continue to iterate in this loop so we can deliver the SIGSEGV...
560 if (handle_signal(signr
, &ka
, &info
, oldset
, scr
))
564 /* Did we come from a system call? */
566 /* Restart the system call - no handlers present */
567 if (errno
== ERESTARTNOHAND
|| errno
== ERESTARTSYS
|| errno
== ERESTARTNOINTR
568 || errno
== ERESTART_RESTARTBLOCK
)
570 if (IS_IA32_PROCESS(&scr
->pt
)) {
571 scr
->pt
.r8
= scr
->pt
.r1
;
573 if (errno
== ERESTART_RESTARTBLOCK
)
574 scr
->pt
.r8
= 0; /* x86 version of __NR_restart_syscall */
577 * Note: the syscall number is in r15 which is saved in
578 * pt_regs so all we need to do here is adjust ip so that
579 * the "break" instruction gets re-executed.
581 ia64_decrement_ip(&scr
->pt
);
582 if (errno
== ERESTART_RESTARTBLOCK
)
583 scr
->pt
.r15
= __NR_restart_syscall
;