2 * linux/arch/m32r/kernel/signal.c
4 * Copyright (c) 2003 Hitoshi Yamamoto
6 * Taken from i386 version.
7 * Copyright (C) 1991, 1992 Linus Torvalds
9 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
10 * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
13 #include <linux/sched.h>
15 #include <linux/smp.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/unistd.h>
21 #include <linux/stddef.h>
22 #include <linux/personality.h>
23 #include <linux/freezer.h>
24 #include <asm/cacheflush.h>
25 #include <asm/ucontext.h>
26 #include <asm/uaccess.h>
30 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
32 int do_signal(struct pt_regs *, sigset_t *);
35 sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
36 unsigned long r2, unsigned long r3, unsigned long r4,
37 unsigned long r5, unsigned long r6, struct pt_regs *regs)
39 sigset_t saveset, newset;
41 /* XXX: Don't preclude handling different sized sigset_t's. */
42 if (sigsetsize != sizeof(sigset_t))
45 if (copy_from_user(&newset, unewset, sizeof(newset)))
47 sigdelsetmask(&newset, ~_BLOCKABLE);
49 spin_lock_irq(¤t->sighand->siglock);
50 saveset = current->blocked;
51 current->blocked = newset;
53 spin_unlock_irq(¤t->sighand->siglock);
57 current->state = TASK_INTERRUPTIBLE;
59 if (do_signal(regs, &saveset))
65 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
66 unsigned long r2, unsigned long r3, unsigned long r4,
67 unsigned long r5, unsigned long r6, struct pt_regs *regs)
69 return do_sigaltstack(uss, uoss, regs->spu);
74 * Do a signal return; undo the signal stack.
80 struct siginfo __user *pinfo;
84 // struct _fpstate fpstate;
88 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
93 /* Always make any pending restarted system calls return -EINTR */
94 current_thread_info()->restart_block.fn = do_no_restart_syscall;
96 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
101 /* COPY(r0); Skip r0 */
113 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
114 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
125 regs->syscall_nr = -1; /* disable syscall checks */
126 err |= __get_user(*r0_p, &sc->sc_r0);
132 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
133 unsigned long r2, unsigned long r3, unsigned long r4,
134 unsigned long r5, unsigned long r6, struct pt_regs *regs)
136 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
140 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
142 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
145 sigdelsetmask(&set, ~_BLOCKABLE);
146 spin_lock_irq(¤t->sighand->siglock);
147 current->blocked = set;
149 spin_unlock_irq(¤t->sighand->siglock);
151 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
154 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
160 force_sig(SIGSEGV, current);
165 * Set up a signal frame.
169 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
174 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
191 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
192 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
203 err |= __put_user(mask, &sc->oldmask);
209 * Determine which stack to use..
211 static inline void __user *
212 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
214 /* This is the X/Open sanctioned signal stack switching. */
215 if (ka->sa.sa_flags & SA_ONSTACK) {
216 if (sas_ss_flags(sp) == 0)
217 sp = current->sas_ss_sp + current->sas_ss_size;
220 return (void __user *)((sp - frame_size) & -8ul);
223 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
224 sigset_t *set, struct pt_regs *regs)
226 struct rt_sigframe __user *frame;
230 frame = get_sigframe(ka, regs->spu, sizeof(*frame));
232 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
235 signal = current_thread_info()->exec_domain
236 && current_thread_info()->exec_domain->signal_invmap
238 ? current_thread_info()->exec_domain->signal_invmap[sig]
241 err |= __put_user(signal, &frame->sig);
245 err |= __put_user(&frame->info, &frame->pinfo);
246 err |= __put_user(&frame->uc, &frame->puc);
247 err |= copy_siginfo_to_user(&frame->info, info);
251 /* Create the ucontext. */
252 err |= __put_user(0, &frame->uc.uc_flags);
253 err |= __put_user(0, &frame->uc.uc_link);
254 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
255 err |= __put_user(sas_ss_flags(regs->spu),
256 &frame->uc.uc_stack.ss_flags);
257 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
258 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
259 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
263 /* Set up to return from userspace. */
264 regs->lr = (unsigned long)ka->sa.sa_restorer;
266 /* Set up registers for signal handler */
267 regs->spu = (unsigned long)frame;
268 regs->r0 = signal; /* Arg for signal handler */
269 regs->r1 = (unsigned long)&frame->info;
270 regs->r2 = (unsigned long)&frame->uc;
271 regs->bpc = (unsigned long)ka->sa.sa_handler;
276 printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
277 current->comm, current->pid, frame, regs->pc);
283 force_sigsegv(sig, current);
287 * OK, we're invoking a handler
291 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
292 sigset_t *oldset, struct pt_regs *regs)
296 /* Are we from a system call? */
297 if (regs->syscall_nr >= 0) {
298 /* If so, check system call restarting.. */
300 case -ERESTART_RESTARTBLOCK:
301 case -ERESTARTNOHAND:
306 if (!(ka->sa.sa_flags & SA_RESTART)) {
311 case -ERESTARTNOINTR:
312 regs->r0 = regs->orig_r0;
313 inst = *(unsigned short *)(regs->bpc - 2);
314 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
321 /* Set up the stack frame */
322 setup_rt_frame(sig, ka, info, oldset, regs);
324 spin_lock_irq(¤t->sighand->siglock);
325 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
326 if (!(ka->sa.sa_flags & SA_NODEFER))
327 sigaddset(¤t->blocked,sig);
329 spin_unlock_irq(¤t->sighand->siglock);
333 * Note that 'init' is a special process: it doesn't get signals it doesn't
334 * want to handle. Thus you cannot kill init even with a SIGKILL even by
337 int do_signal(struct pt_regs *regs, sigset_t *oldset)
341 struct k_sigaction ka;
345 * We want the common case to go fast, which
346 * is why we may in certain cases get here from
347 * kernel mode. Just return without doing anything
350 if (!user_mode(regs))
357 oldset = ¤t->blocked;
359 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
361 /* Reenable any watchpoints before delivering the
362 * signal to user space. The processor register will
363 * have been cleared if the watchpoint triggered
367 /* Whee! Actually deliver the signal. */
368 handle_signal(signr, &ka, &info, oldset, regs);
373 /* Did we come from a system call? */
374 if (regs->syscall_nr >= 0) {
375 /* Restart the system call - no handlers present */
376 if (regs->r0 == -ERESTARTNOHAND ||
377 regs->r0 == -ERESTARTSYS ||
378 regs->r0 == -ERESTARTNOINTR) {
379 regs->r0 = regs->orig_r0;
380 inst = *(unsigned short *)(regs->bpc - 2);
381 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
386 if (regs->r0 == -ERESTART_RESTARTBLOCK){
387 regs->r0 = regs->orig_r0;
388 regs->r7 = __NR_restart_syscall;
389 inst = *(unsigned short *)(regs->bpc - 2);
390 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
400 * notification of userspace execution resumption
401 * - triggered by current->work.notify_resume
403 void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
404 __u32 thread_info_flags)
406 /* Pending single-step? */
407 if (thread_info_flags & _TIF_SINGLESTEP)
408 clear_thread_flag(TIF_SINGLESTEP);
410 /* deal with pending signal delivery */
411 if (thread_info_flags & _TIF_SIGPENDING)
412 do_signal(regs,oldset);
414 clear_thread_flag(TIF_IRET);