4 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
5 * Copyright (C) 2008-2009 PetaLogix
6 * Copyright (C) 2003,2004 John Williams <jwilliams@itee.uq.edu.au>
7 * Copyright (C) 2001 NEC Corporation
8 * Copyright (C) 2001 Miles Bader <miles@gnu.org>
9 * Copyright (C) 1999,2000 Niibe Yutaka & Kaz Kojima
10 * Copyright (C) 1991,1992 Linus Torvalds
12 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
14 * This file was was derived from the sh version, arch/sh/kernel/signal.c
16 * This file is subject to the terms and conditions of the GNU General
17 * Public License. See the file COPYING in the main directory of this
18 * archive for more details.
21 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/kernel.h>
26 #include <linux/signal.h>
27 #include <linux/errno.h>
28 #include <linux/wait.h>
29 #include <linux/ptrace.h>
30 #include <linux/unistd.h>
31 #include <linux/stddef.h>
32 #include <linux/personality.h>
33 #include <linux/percpu.h>
34 #include <linux/linkage.h>
35 #include <asm/entry.h>
36 #include <asm/ucontext.h>
37 #include <linux/uaccess.h>
38 #include <asm/pgtable.h>
39 #include <asm/pgalloc.h>
40 #include <linux/signal.h>
41 #include <linux/syscalls.h>
42 #include <asm/cacheflush.h>
43 #include <asm/syscalls.h>
45 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
47 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_sycall);
50 * Atomically swap in the new signal mask, and wait for a signal.
53 sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs)
58 spin_lock_irq(¤t->sighand->siglock);
59 saveset = current->blocked;
60 siginitset(¤t->blocked, mask);
62 spin_unlock_irq(¤t->sighand->siglock);
66 current->state = TASK_INTERRUPTIBLE;
68 if (do_signal(regs, &saveset, 1))
74 sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
77 sigset_t saveset, newset;
79 /* XXX: Don't preclude handling different sized sigset_t's. */
80 if (sigsetsize != sizeof(sigset_t))
83 if (copy_from_user(&newset, unewset, sizeof(newset)))
85 sigdelsetmask(&newset, ~_BLOCKABLE);
86 spin_lock_irq(¤t->sighand->siglock);
87 saveset = current->blocked;
88 current->blocked = newset;
90 spin_unlock_irq(¤t->sighand->siglock);
94 current->state = TASK_INTERRUPTIBLE;
96 if (do_signal(regs, &saveset, 1))
102 sys_sigaction(int sig, const struct old_sigaction *act,
103 struct old_sigaction *oact)
105 struct k_sigaction new_ka, old_ka;
110 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
111 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
112 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
114 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
115 __get_user(mask, &act->sa_mask);
116 siginitset(&new_ka.sa.sa_mask, mask);
119 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
122 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
123 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
124 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
126 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
127 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
134 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
135 struct pt_regs *regs)
137 return do_sigaltstack(uss, uoss, regs->r1);
141 * Do a signal return; undo the signal stack.
145 struct sigcontext sc;
146 unsigned long extramask[_NSIG_WORDS-1];
147 unsigned long tramp[2]; /* signal trampoline */
153 unsigned long tramp[2]; /* signal trampoline */
157 restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc, int *rval_p)
159 unsigned int err = 0;
161 #define COPY(x) {err |= __get_user(regs->x, &sc->regs.x); }
164 COPY(r2); COPY(r3); COPY(r4); COPY(r5);
165 COPY(r6); COPY(r7); COPY(r8); COPY(r9);
166 COPY(r10); COPY(r11); COPY(r12); COPY(r13);
167 COPY(r14); COPY(r15); COPY(r16); COPY(r17);
168 COPY(r18); COPY(r19); COPY(r20); COPY(r21);
169 COPY(r22); COPY(r23); COPY(r24); COPY(r25);
170 COPY(r26); COPY(r27); COPY(r28); COPY(r29);
171 COPY(r30); COPY(r31);
172 COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
180 asmlinkage int sys_sigreturn(struct pt_regs *regs)
182 struct sigframe *frame = (struct sigframe *)regs->r1;
186 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
189 if (__get_user(set.sig[0], &frame->sc.oldmask)
191 && __copy_from_user(&set.sig[1], &frame->extramask,
192 sizeof(frame->extramask))))
195 sigdelsetmask(&set, ~_BLOCKABLE);
197 spin_lock_irq(¤t->sighand->siglock);
198 current->blocked = set;
200 spin_unlock_irq(¤t->sighand->siglock);
202 if (restore_sigcontext(regs, &frame->sc, &rval))
207 force_sig(SIGSEGV, current);
211 asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
213 struct rt_sigframe *frame = (struct rt_sigframe *)regs->r1;
218 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
221 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
224 sigdelsetmask(&set, ~_BLOCKABLE);
225 spin_lock_irq(¤t->sighand->siglock);
226 current->blocked = set;
228 spin_unlock_irq(¤t->sighand->siglock);
230 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
233 if (__copy_from_user((void *)&st, &frame->uc.uc_stack, sizeof(st)))
235 /* It is more difficult to avoid calling this function than to
236 call it and ignore errors. */
237 do_sigaltstack(&st, NULL, regs->r1);
242 force_sig(SIGSEGV, current);
247 * Set up a signal frame.
251 setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
256 #define COPY(x) {err |= __put_user(regs->x, &sc->regs.x); }
259 COPY(r2); COPY(r3); COPY(r4); COPY(r5);
260 COPY(r6); COPY(r7); COPY(r8); COPY(r9);
261 COPY(r10); COPY(r11); COPY(r12); COPY(r13);
262 COPY(r14); COPY(r15); COPY(r16); COPY(r17);
263 COPY(r18); COPY(r19); COPY(r20); COPY(r21);
264 COPY(r22); COPY(r23); COPY(r24); COPY(r25);
265 COPY(r26); COPY(r27); COPY(r28); COPY(r29);
266 COPY(r30); COPY(r31);
267 COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
270 err |= __put_user(mask, &sc->oldmask);
276 * Determine which stack to use..
279 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
281 /* Default to using normal stack */
282 unsigned long sp = regs->r1;
284 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack(sp))
285 sp = current->sas_ss_sp + current->sas_ss_size;
287 return (void *)((sp - frame_size) & -8UL);
290 static void setup_frame(int sig, struct k_sigaction *ka,
291 sigset_t *set, struct pt_regs *regs)
293 struct sigframe *frame;
297 frame = get_sigframe(ka, regs, sizeof(*frame));
299 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
302 signal = current_thread_info()->exec_domain
303 && current_thread_info()->exec_domain->signal_invmap
305 ? current_thread_info()->exec_domain->signal_invmap[sig]
308 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
310 if (_NSIG_WORDS > 1) {
311 err |= __copy_to_user(frame->extramask, &set->sig[1],
312 sizeof(frame->extramask));
315 /* Set up to return from userspace. If provided, use a stub
316 already in userspace. */
317 /* minus 8 is offset to cater for "rtsd r15,8" offset */
318 if (ka->sa.sa_flags & SA_RESTORER) {
319 regs->r15 = ((unsigned long)ka->sa.sa_restorer)-8;
321 /* Note, these encodings are _big endian_! */
323 /* addi r12, r0, __NR_sigreturn */
324 err |= __put_user(0x31800000 | __NR_sigreturn ,
327 err |= __put_user(0xb9cc0008, frame->tramp + 1);
329 /* Return from sighandler will jump to the tramp.
330 Negative 8 offset because return is rtsd r15, 8 */
331 regs->r15 = ((unsigned long)frame->tramp)-8;
333 __invalidate_cache_sigtramp((unsigned long)frame->tramp);
339 /* Set up registers for signal handler */
340 regs->r1 = (unsigned long) frame;
341 /* Signal handler args: */
342 regs->r5 = signal; /* Arg 0: signum */
343 regs->r6 = (unsigned long) &frame->sc; /* arg 1: sigcontext */
345 /* Offset of 4 to handle microblaze rtid r14, 0 */
346 regs->pc = (unsigned long)ka->sa.sa_handler;
351 printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n",
352 current->comm, current->pid, frame, regs->pc);
359 ka->sa.sa_handler = SIG_DFL;
360 force_sig(SIGSEGV, current);
363 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
364 sigset_t *set, struct pt_regs *regs)
366 struct rt_sigframe *frame;
370 frame = get_sigframe(ka, regs, sizeof(*frame));
372 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
375 signal = current_thread_info()->exec_domain
376 && current_thread_info()->exec_domain->signal_invmap
378 ? current_thread_info()->exec_domain->signal_invmap[sig]
381 err |= copy_siginfo_to_user(&frame->info, info);
383 /* Create the ucontext. */
384 err |= __put_user(0, &frame->uc.uc_flags);
385 err |= __put_user(0, &frame->uc.uc_link);
386 err |= __put_user((void *)current->sas_ss_sp,
387 &frame->uc.uc_stack.ss_sp);
388 err |= __put_user(sas_ss_flags(regs->r1),
389 &frame->uc.uc_stack.ss_flags);
390 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
391 err |= setup_sigcontext(&frame->uc.uc_mcontext,
393 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
395 /* Set up to return from userspace. If provided, use a stub
396 already in userspace. */
397 /* minus 8 is offset to cater for "rtsd r15,8" */
398 if (ka->sa.sa_flags & SA_RESTORER) {
399 regs->r15 = ((unsigned long)ka->sa.sa_restorer)-8;
401 /* addi r12, r0, __NR_sigreturn */
402 err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
405 err |= __put_user(0xb9cc0008, frame->tramp + 1);
407 /* Return from sighandler will jump to the tramp.
408 Negative 8 offset because return is rtsd r15, 8 */
409 regs->r15 = ((unsigned long)frame->tramp)-8;
411 __invalidate_cache_sigtramp((unsigned long)frame->tramp);
417 /* Set up registers for signal handler */
418 regs->r1 = (unsigned long) frame;
419 /* Signal handler args: */
420 regs->r5 = signal; /* arg 0: signum */
421 regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */
422 regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */
423 /* Offset to handle microblaze rtid r14, 0 */
424 regs->pc = (unsigned long)ka->sa.sa_handler;
429 printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n",
430 current->comm, current->pid, frame, regs->pc);
437 ka->sa.sa_handler = SIG_DFL;
438 force_sig(SIGSEGV, current);
441 /* Handle restarting system calls */
443 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
446 case -ERESTART_RESTARTBLOCK:
447 case -ERESTARTNOHAND:
453 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
458 case -ERESTARTNOINTR:
460 /* offset of 4 bytes to re-execute trap (brki) instruction */
467 * OK, we're invoking a handler
471 handle_signal(unsigned long sig, struct k_sigaction *ka,
472 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
474 /* Set up the stack frame */
475 if (ka->sa.sa_flags & SA_SIGINFO)
476 setup_rt_frame(sig, ka, info, oldset, regs);
478 setup_frame(sig, ka, oldset, regs);
480 if (ka->sa.sa_flags & SA_ONESHOT)
481 ka->sa.sa_handler = SIG_DFL;
483 if (!(ka->sa.sa_flags & SA_NODEFER)) {
484 spin_lock_irq(¤t->sighand->siglock);
485 sigorsets(¤t->blocked,
486 ¤t->blocked, &ka->sa.sa_mask);
487 sigaddset(¤t->blocked, sig);
489 spin_unlock_irq(¤t->sighand->siglock);
494 * Note that 'init' is a special process: it doesn't get signals it doesn't
495 * want to handle. Thus you cannot kill init even with a SIGKILL even by
498 * Note that we go through the signals twice: once to check the signals that
499 * the kernel can handle, and then we build all the user-level signal handling
500 * stack-frames in one go after that.
502 int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall)
506 struct k_sigaction ka;
508 printk(KERN_INFO "do signal: %p %p %d\n", regs, oldset, in_syscall);
509 printk(KERN_INFO "do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
510 regs->r12, current_thread_info()->flags);
513 * We want the common case to go fast, which
514 * is why we may in certain cases get here from
515 * kernel mode. Just return without doing anything
518 if (kernel_mode(regs))
522 oldset = ¤t->blocked;
524 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
526 /* Whee! Actually deliver the signal. */
528 handle_restart(regs, &ka, 1);
529 handle_signal(signr, &ka, &info, oldset, regs);
534 handle_restart(regs, NULL, 0);
536 /* Did we come from a system call? */