2 * Architecture-specific signal handling support.
4 * Copyright (C) 1999-2002 Hewlett-Packard Co
5 * David Mosberger-Tang <davidm@hpl.hp.com>
7 * Derived from i386 and Alpha versions.
10 #include <linux/config.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
14 #include <linux/ptrace.h>
15 #include <linux/sched.h>
16 #include <linux/signal.h>
17 #include <linux/smp.h>
18 #include <linux/smp_lock.h>
19 #include <linux/stddef.h>
20 #include <linux/tty.h>
21 #include <linux/binfmts.h>
22 #include <linux/unistd.h>
23 #include <linux/wait.h>
26 #include <asm/uaccess.h>
28 #include <asm/sigcontext.h>
33 #define STACK_ALIGN 16 /* minimal alignment for stack pointer */
34 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
37 # define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
38 # define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
40 # define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0])
41 # define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0])
44 register double f16 asm ("f16"); register double f17 asm ("f17");
45 register double f18 asm ("f18"); register double f19 asm ("f19");
46 register double f20 asm ("f20"); register double f21 asm ("f21");
47 register double f22 asm ("f22"); register double f23 asm ("f23");
49 register double f24 asm ("f24"); register double f25 asm ("f25");
50 register double f26 asm ("f26"); register double f27 asm ("f27");
51 register double f28 asm ("f28"); register double f29 asm ("f29");
52 register double f30 asm ("f30"); register double f31 asm ("f31");
55 ia64_rt_sigsuspend (sigset_t *uset, size_t sigsetsize, struct sigscratch *scr)
59 /* XXX: Don't preclude handling different sized sigset_t's. */
60 if (sigsetsize != sizeof(sigset_t))
63 if (!access_ok(VERIFY_READ, uset, sigsetsize))
66 if (GET_SIGSET(&set, uset))
69 sigdelsetmask(&set, ~_BLOCKABLE);
71 spin_lock_irq(¤t->sighand->siglock);
73 oldset = current->blocked;
74 current->blocked = set;
77 spin_unlock_irq(¤t->sighand->siglock);
80 * The return below usually returns to the signal handler. We need to
81 * pre-set the correct error code here to ensure that the right values
82 * get saved in sigcontext by ia64_do_signal.
88 current->state = TASK_INTERRUPTIBLE;
90 if (ia64_do_signal(&oldset, scr, 1))
96 sys_sigaltstack (const stack_t *uss, stack_t *uoss, long arg2, long arg3, long arg4,
97 long arg5, long arg6, long arg7, long stack)
99 struct pt_regs *pt = (struct pt_regs *) &stack;
101 return do_sigaltstack(uss, uoss, pt->r12);
105 restore_sigcontext (struct sigcontext *sc, struct sigscratch *scr)
107 unsigned long ip, flags, nat, um, cfm;
110 /* restore scratch that always needs gets updated during signal delivery: */
111 err = __get_user(flags, &sc->sc_flags);
113 err |= __get_user(nat, &sc->sc_nat);
114 err |= __get_user(ip, &sc->sc_ip); /* instruction pointer */
115 err |= __get_user(cfm, &sc->sc_cfm);
116 err |= __get_user(um, &sc->sc_um); /* user mask */
117 err |= __get_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
118 err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
119 err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
120 err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
121 err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
122 err |= __get_user(scr->pt.pr, &sc->sc_pr); /* predicates */
123 err |= __get_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
124 err |= __get_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
125 err |= __get_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
126 err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 3*8); /* r1-r3 */
127 err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8); /* r8-r11 */
128 err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 4*8); /* r12-r15 */
129 err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8); /* r16-r31 */
131 scr->pt.cr_ifs = cfm | (1UL << 63);
133 /* establish new instruction pointer: */
134 scr->pt.cr_iip = ip & ~0x3UL;
135 ia64_psr(&scr->pt)->ri = ip & 0x3;
136 scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
138 scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
140 if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
141 struct ia64_psr *psr = ia64_psr(&scr->pt);
143 __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
144 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);
157 copy_siginfo_to_user (siginfo_t *to, siginfo_t *from)
159 if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t)))
161 if (from->si_code < 0) {
162 if (__copy_to_user(to, from, sizeof(siginfo_t)))
169 * If you change siginfo_t structure, please be sure
170 * this code is fixed accordingly. It should never
171 * copy any pad contained in the structure to avoid
172 * security leaks, but must copy the generic 3 ints
173 * plus the 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_CHLD >> 16:
187 err |= __put_user(from->si_utime, &to->si_utime);
188 err |= __put_user(from->si_stime, &to->si_stime);
189 err |= __put_user(from->si_status, &to->si_status);
190 case __SI_PROF >> 16:
191 err |= __put_user(from->si_uid, &to->si_uid);
192 err |= __put_user(from->si_pid, &to->si_pid);
193 if (from->si_code == PROF_OVFL) {
194 err |= __put_user(from->si_pfm_ovfl[0], &to->si_pfm_ovfl[0]);
195 err |= __put_user(from->si_pfm_ovfl[1], &to->si_pfm_ovfl[1]);
196 err |= __put_user(from->si_pfm_ovfl[2], &to->si_pfm_ovfl[2]);
197 err |= __put_user(from->si_pfm_ovfl[3], &to->si_pfm_ovfl[3]);
199 case __SI_TIMER >> 16:
200 err |= __put_user(from->si_tid, &to->si_tid);
201 err |= __put_user(from->si_overrun, &to->si_overrun);
202 err |= __put_user(from->si_value, &to->si_value);
205 err |= __put_user(from->si_uid, &to->si_uid);
206 err |= __put_user(from->si_pid, &to->si_pid);
208 /* case __SI_RT: This is not generated by the kernel as of now. */
215 copy_siginfo_from_user (siginfo_t *to, siginfo_t *from)
217 if (!access_ok(VERIFY_READ, from, sizeof(siginfo_t)))
219 if (__copy_from_user(to, from, sizeof(siginfo_t)) != 0)
225 to->si_code &= ~__SI_MASK;
226 if (to->si_code != 0) {
227 switch (to->si_signo) {
228 case SIGILL: case SIGFPE: case SIGSEGV: case SIGBUS: case SIGTRAP:
229 to->si_code |= __SI_FAULT;
233 to->si_code |= __SI_CHLD;
237 to->si_code |= __SI_POLL;
241 to->si_code |= __SI_PROF;
252 ia64_rt_sigreturn (struct sigscratch *scr)
254 extern char ia64_strace_leave_kernel, ia64_leave_kernel;
255 struct sigcontext *sc;
260 sc = &((struct sigframe *) (scr->pt.r12 + 16))->sc;
263 * When we return to the previously executing context, r8 and r10 have already
264 * been setup the way we want them. Indeed, if the signal wasn't delivered while
265 * in a system call, we must not touch r8 or r10 as otherwise user-level state
266 * could be corrupted.
268 retval = (long) &ia64_leave_kernel;
269 if (test_thread_flag(TIF_SYSCALL_TRACE))
271 * strace expects to be notified after sigreturn returns even though the
272 * context to which we return may not be in the middle of a syscall.
273 * Thus, the return-value that strace displays for sigreturn is
276 retval = (long) &ia64_strace_leave_kernel;
278 if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
281 if (GET_SIGSET(&set, &sc->sc_mask))
284 sigdelsetmask(&set, ~_BLOCKABLE);
286 spin_lock_irq(¤t->sighand->siglock);
288 current->blocked = set;
291 spin_unlock_irq(¤t->sighand->siglock);
293 if (restore_sigcontext(sc, scr))
297 printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
298 current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
301 * It is more difficult to avoid calling this function than to
302 * call it and ignore errors.
304 do_sigaltstack(&sc->sc_stack, 0, scr->pt.r12);
308 si.si_signo = SIGSEGV;
310 si.si_code = SI_KERNEL;
311 si.si_pid = current->pid;
312 si.si_uid = current->uid;
314 force_sig_info(SIGSEGV, &si, current);
319 * This does just the minimum required setup of sigcontext.
320 * Specifically, it only installs data that is either not knowable at
321 * the user-level or that gets modified before execution in the
322 * trampoline starts. Everything else is done at the user-level.
325 setup_sigcontext (struct sigcontext *sc, sigset_t *mask, struct sigscratch *scr)
327 unsigned long flags = 0, ifs, cfm, nat;
330 ifs = scr->pt.cr_ifs;
332 if (on_sig_stack((unsigned long) sc))
333 flags |= IA64_SC_FLAG_ONSTACK;
334 if ((ifs & (1UL << 63)) == 0) {
335 /* if cr_ifs isn't valid, we got here through a syscall */
336 flags |= IA64_SC_FLAG_IN_SYSCALL;
337 cfm = scr->ar_pfs & ((1UL << 38) - 1);
339 cfm = ifs & ((1UL << 38) - 1);
340 ia64_flush_fph(current);
341 if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
342 flags |= IA64_SC_FLAG_FPH_VALID;
343 __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
347 * Note: sw->ar_unat is UNDEFINED unless the process is being
348 * PTRACED. However, this is OK because the NaT bits of the
349 * preserved registers (r4-r7) are never being looked at by
350 * the signal handler (registers r4-r7 are used instead).
352 nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
354 err = __put_user(flags, &sc->sc_flags);
356 err |= __put_user(nat, &sc->sc_nat);
357 err |= PUT_SIGSET(mask, &sc->sc_mask);
358 err |= __put_user(cfm, &sc->sc_cfm);
359 err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
360 err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
361 err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
362 err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat); /* ar.unat */
363 err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr); /* ar.fpsr */
364 err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
365 err |= __put_user(scr->pt.pr, &sc->sc_pr); /* predicates */
366 err |= __put_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
367 err |= __put_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
368 err |= __put_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
370 err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 3*8); /* r1-r3 */
371 err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8); /* r8-r11 */
372 err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 4*8); /* r12-r15 */
373 err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8); /* r16-r31 */
375 err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
380 * Check whether the register-backing store is already on the signal stack.
383 rbs_on_sig_stack (unsigned long bsp)
385 return (bsp - current->sas_ss_sp < current->sas_ss_size);
389 setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
390 struct sigscratch *scr)
392 extern char ia64_sigtramp[], __start_gate_section[];
393 unsigned long tramp_addr, new_rbs = 0;
394 struct sigframe *frame;
398 frame = (void *) scr->pt.r12;
399 tramp_addr = GATE_ADDR + (ia64_sigtramp - __start_gate_section);
400 if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags((unsigned long) frame) == 0) {
401 frame = (void *) ((current->sas_ss_sp + current->sas_ss_size)
402 & ~(STACK_ALIGN - 1));
404 * We need to check for the register stack being on the signal stack
405 * separately, because it's switched separately (memory stack is switched
406 * in the kernel, register stack is switched in the signal trampoline).
408 if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
409 new_rbs = (current->sas_ss_sp + sizeof(long) - 1) & ~(sizeof(long) - 1);
411 frame = (void *) frame - ((sizeof(*frame) + STACK_ALIGN - 1) & ~(STACK_ALIGN - 1));
413 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
416 err = __put_user(sig, &frame->arg0);
417 err |= __put_user(&frame->info, &frame->arg1);
418 err |= __put_user(&frame->sc, &frame->arg2);
419 err |= __put_user(new_rbs, &frame->sc.sc_rbs_base);
420 err |= __put_user(0, &frame->sc.sc_loadrs); /* initialize to zero */
421 err |= __put_user(ka->sa.sa_handler, &frame->handler);
423 err |= copy_siginfo_to_user(&frame->info, info);
425 err |= __put_user(current->sas_ss_sp, &frame->sc.sc_stack.ss_sp);
426 err |= __put_user(current->sas_ss_size, &frame->sc.sc_stack.ss_size);
427 err |= __put_user(sas_ss_flags(scr->pt.r12), &frame->sc.sc_stack.ss_flags);
428 err |= setup_sigcontext(&frame->sc, set, scr);
433 scr->pt.r12 = (unsigned long) frame - 16; /* new stack pointer */
434 scr->pt.ar_fpsr = FPSR_DEFAULT; /* reset fpsr for signal handler */
435 scr->pt.cr_iip = tramp_addr;
436 ia64_psr(&scr->pt)->ri = 0; /* start executing in first slot */
438 * Force the interruption function mask to zero. This has no effect when a
439 * system-call got interrupted by a signal (since, in that case, scr->pt_cr_ifs is
440 * ignored), but it has the desirable effect of making it possible to deliver a
441 * signal with an incomplete register frame (which happens when a mandatory RSE
442 * load faults). Furthermore, it has no negative effect on the getting the user's
443 * dirty partition preserved, because that's governed by scr->pt.loadrs.
445 scr->pt.cr_ifs = (1UL << 63);
448 * Note: this affects only the NaT bits of the scratch regs (the ones saved in
449 * pt_regs), which is exactly what we want.
451 scr->scratch_unat = 0; /* ensure NaT bits of r12 is clear */
454 printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%lx\n",
455 current->comm, current->pid, sig, scr->pt.r12, scr->pt.cr_iip, scr->pt.r3);
461 ka->sa.sa_handler = SIG_DFL;
462 si.si_signo = SIGSEGV;
464 si.si_code = SI_KERNEL;
465 si.si_pid = current->pid;
466 si.si_uid = current->uid;
468 force_sig_info(SIGSEGV, &si, current);
473 handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset,
474 struct sigscratch *scr)
476 if (IS_IA32_PROCESS(&scr->pt)) {
477 /* send signal to IA-32 process */
478 if (!ia32_setup_frame1(sig, ka, info, oldset, &scr->pt))
481 /* send signal to IA-64 process */
482 if (!setup_frame(sig, ka, info, oldset, scr))
485 if (ka->sa.sa_flags & SA_ONESHOT)
486 ka->sa.sa_handler = SIG_DFL;
488 if (!(ka->sa.sa_flags & SA_NODEFER)) {
489 spin_lock_irq(¤t->sighand->siglock);
491 sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
492 sigaddset(¤t->blocked, sig);
495 spin_unlock_irq(¤t->sighand->siglock);
501 * Note that `init' is a special process: it doesn't get signals it doesn't want to
502 * handle. Thus you cannot kill init even with a SIGKILL even by mistake.
505 ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
507 struct k_sigaction *ka;
509 long restart = in_syscall;
510 long errno = scr->pt.r8;
511 # define ERR_CODE(c) (IS_IA32_PROCESS(&scr->pt) ? -(c) : (c))
514 * In the ia64_leave_kernel code path, we want the common case to go fast, which
515 * is why we may in certain cases get here from kernel mode. Just return without
516 * doing anything if so.
518 if (!user_mode(&scr->pt))
522 oldset = ¤t->blocked;
524 if (IS_IA32_PROCESS(&scr->pt)) {
531 } else if ((long) scr->pt.r10 != -1)
533 * A system calls has to be restarted only if one of the error codes
534 * ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned. If r10
535 * isn't -1 then r8 doesn't hold an error code and we don't need to
536 * restart the syscall, so we can clear the "restart" flag here.
541 int signr = get_signal_to_deliver(&info, &scr->pt, NULL);
546 ka = ¤t->sighand->action[signr - 1];
550 case ERESTART_RESTARTBLOCK:
551 current_thread_info()->restart_block.fn = do_no_restart_syscall;
553 scr->pt.r8 = ERR_CODE(EINTR);
554 /* note: scr->pt.r10 is already -1 */
558 if ((ka->sa.sa_flags & SA_RESTART) == 0) {
559 scr->pt.r8 = ERR_CODE(EINTR);
560 /* note: scr->pt.r10 is already -1 */
564 if (IS_IA32_PROCESS(&scr->pt)) {
565 scr->pt.r8 = scr->pt.r1;
568 ia64_decrement_ip(&scr->pt);
573 * Whee! Actually deliver the signal. If the delivery failed, we need to
574 * continue to iterate in this loop so we can deliver the SIGSEGV...
576 if (handle_signal(signr, ka, &info, oldset, scr))
580 /* Did we come from a system call? */
582 /* Restart the system call - no handlers present */
583 if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR
584 || errno == ERESTART_RESTARTBLOCK)
586 if (IS_IA32_PROCESS(&scr->pt)) {
587 scr->pt.r8 = scr->pt.r1;
589 if (errno == ERESTART_RESTARTBLOCK) {
590 scr->pt.r8 = 0; /* x86 version of __NR_restart_syscall */
595 * Note: the syscall number is in r15 which is saved in
596 * pt_regs so all we need to do here is adjust ip so that
597 * the "break" instruction gets re-executed.
599 ia64_decrement_ip(&scr->pt);
600 if (errno == ERESTART_RESTARTBLOCK)
601 scr->pt.r15 = __NR_restart_syscall;