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/config.h>
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.h>
18 #include <linux/kernel.h>
19 #include <linux/signal.h>
20 #include <linux/errno.h>
21 #include <linux/wait.h>
22 #include <linux/unistd.h>
23 #include <linux/stddef.h>
24 #include <linux/personality.h>
25 #include <linux/suspend.h>
26 #include <asm/cacheflush.h>
27 #include <asm/ucontext.h>
28 #include <asm/uaccess.h>
32 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
34 int do_signal(struct pt_regs *, sigset_t *);
37 sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
38 unsigned long r2, unsigned long r3, unsigned long r4,
39 unsigned long r5, unsigned long r6, struct pt_regs *regs)
41 sigset_t saveset, newset;
43 /* XXX: Don't preclude handling different sized sigset_t's. */
44 if (sigsetsize != sizeof(sigset_t))
47 if (copy_from_user(&newset, unewset, sizeof(newset)))
49 sigdelsetmask(&newset, ~_BLOCKABLE);
51 spin_lock_irq(¤t->sighand->siglock);
52 saveset = current->blocked;
53 current->blocked = newset;
55 spin_unlock_irq(¤t->sighand->siglock);
59 current->state = TASK_INTERRUPTIBLE;
61 if (do_signal(regs, &saveset))
67 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
68 unsigned long r2, unsigned long r3, unsigned long r4,
69 unsigned long r5, unsigned long r6, struct pt_regs *regs)
71 return do_sigaltstack(uss, uoss, regs->spu);
76 * Do a signal return; undo the signal stack.
82 struct siginfo *pinfo;
86 // struct _fpstate fpstate;
90 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
95 /* Always make any pending restarted system calls return -EINTR */
96 current_thread_info()->restart_block.fn = do_no_restart_syscall;
98 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
103 /* COPY(r0); Skip r0 */
113 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
118 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
122 #error unknown isa configuration
134 regs->syscall_nr = -1; /* disable syscall checks */
135 err |= __get_user(*r0_p, &sc->sc_r0);
141 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
142 unsigned long r2, unsigned long r3, unsigned long r4,
143 unsigned long r5, unsigned long r6, struct pt_regs *regs)
145 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
149 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
151 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
154 sigdelsetmask(&set, ~_BLOCKABLE);
155 spin_lock_irq(¤t->sighand->siglock);
156 current->blocked = set;
158 spin_unlock_irq(¤t->sighand->siglock);
160 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
163 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
169 force_sig(SIGSEGV, current);
174 * Set up a signal frame.
178 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
183 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
198 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
203 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
207 #error unknown isa configuration
219 err |= __put_user(mask, &sc->oldmask);
225 * Determine which stack to use..
227 static inline void __user *
228 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
230 /* This is the X/Open sanctioned signal stack switching. */
231 if (ka->sa.sa_flags & SA_ONSTACK) {
232 if (sas_ss_flags(sp) == 0)
233 sp = current->sas_ss_sp + current->sas_ss_size;
236 return (void __user *)((sp - frame_size) & -8ul);
239 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
240 sigset_t *set, struct pt_regs *regs)
242 struct rt_sigframe __user *frame;
246 frame = get_sigframe(ka, regs->spu, sizeof(*frame));
248 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
251 signal = current_thread_info()->exec_domain
252 && current_thread_info()->exec_domain->signal_invmap
254 ? current_thread_info()->exec_domain->signal_invmap[sig]
257 err |= __put_user(signal, &frame->sig);
261 err |= __put_user(&frame->info, &frame->pinfo);
262 err |= __put_user(&frame->uc, &frame->puc);
263 err |= copy_siginfo_to_user(&frame->info, info);
267 /* Create the ucontext. */
268 err |= __put_user(0, &frame->uc.uc_flags);
269 err |= __put_user(0, &frame->uc.uc_link);
270 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
271 err |= __put_user(sas_ss_flags(regs->spu),
272 &frame->uc.uc_stack.ss_flags);
273 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
274 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
275 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
279 /* Set up to return from userspace. */
280 regs->lr = (unsigned long)ka->sa.sa_restorer;
282 /* Set up registers for signal handler */
283 regs->spu = (unsigned long)frame;
284 regs->r0 = signal; /* Arg for signal handler */
285 regs->r1 = (unsigned long)&frame->info;
286 regs->r2 = (unsigned long)&frame->uc;
287 regs->bpc = (unsigned long)ka->sa.sa_handler;
292 printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
293 current->comm, current->pid, frame, regs->pc);
299 force_sigsegv(sig, current);
303 * OK, we're invoking a handler
307 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
308 sigset_t *oldset, struct pt_regs *regs)
312 /* Are we from a system call? */
313 if (regs->syscall_nr >= 0) {
314 /* If so, check system call restarting.. */
316 case -ERESTART_RESTARTBLOCK:
317 case -ERESTARTNOHAND:
322 if (!(ka->sa.sa_flags & SA_RESTART)) {
327 case -ERESTARTNOINTR:
328 regs->r0 = regs->orig_r0;
329 inst = *(unsigned short *)(regs->bpc - 2);
330 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
337 /* Set up the stack frame */
338 setup_rt_frame(sig, ka, info, oldset, regs);
340 spin_lock_irq(¤t->sighand->siglock);
341 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
342 if (!(ka->sa.sa_flags & SA_NODEFER))
343 sigaddset(¤t->blocked,sig);
345 spin_unlock_irq(¤t->sighand->siglock);
349 * Note that 'init' is a special process: it doesn't get signals it doesn't
350 * want to handle. Thus you cannot kill init even with a SIGKILL even by
353 int do_signal(struct pt_regs *regs, sigset_t *oldset)
357 struct k_sigaction ka;
361 * We want the common case to go fast, which
362 * is why we may in certain cases get here from
363 * kernel mode. Just return without doing anything
366 if (!user_mode(regs))
373 oldset = ¤t->blocked;
375 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
377 /* Reenable any watchpoints before delivering the
378 * signal to user space. The processor register will
379 * have been cleared if the watchpoint triggered
383 /* Whee! Actually deliver the signal. */
384 handle_signal(signr, &ka, &info, oldset, regs);
389 /* Did we come from a system call? */
390 if (regs->syscall_nr >= 0) {
391 /* Restart the system call - no handlers present */
392 if (regs->r0 == -ERESTARTNOHAND ||
393 regs->r0 == -ERESTARTSYS ||
394 regs->r0 == -ERESTARTNOINTR) {
395 regs->r0 = regs->orig_r0;
396 inst = *(unsigned short *)(regs->bpc - 2);
397 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
402 if (regs->r0 == -ERESTART_RESTARTBLOCK){
403 regs->r0 = regs->orig_r0;
404 regs->r7 = __NR_restart_syscall;
405 inst = *(unsigned short *)(regs->bpc - 2);
406 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
416 * notification of userspace execution resumption
417 * - triggered by current->work.notify_resume
419 void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
420 __u32 thread_info_flags)
422 /* Pending single-step? */
423 if (thread_info_flags & _TIF_SINGLESTEP)
424 clear_thread_flag(TIF_SINGLESTEP);
426 /* deal with pending signal delivery */
427 if (thread_info_flags & _TIF_SIGPENDING)
428 do_signal(regs,oldset);
430 clear_thread_flag(TIF_IRET);