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/tracehook.h>
24 #include <asm/cacheflush.h>
25 #include <asm/ucontext.h>
26 #include <asm/uaccess.h>
31 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
32 unsigned long r2, unsigned long r3, unsigned long r4,
33 unsigned long r5, unsigned long r6, struct pt_regs *regs)
35 return do_sigaltstack(uss, uoss, regs->spu);
40 * Do a signal return; undo the signal stack.
46 struct siginfo __user *pinfo;
50 // struct _fpstate fpstate;
54 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
59 /* Always make any pending restarted system calls return -EINTR */
60 current_thread_info()->restart_block.fn = do_no_restart_syscall;
62 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
67 /* COPY(r0); Skip r0 */
79 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
80 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
91 regs->syscall_nr = -1; /* disable syscall checks */
92 err |= __get_user(*r0_p, &sc->sc_r0);
98 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
99 unsigned long r2, unsigned long r3, unsigned long r4,
100 unsigned long r5, unsigned long r6, struct pt_regs *regs)
102 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
106 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
108 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
111 set_current_blocked(&set);
113 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
116 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
122 force_sig(SIGSEGV, current);
127 * Set up a signal frame.
131 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
136 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
153 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
154 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
165 err |= __put_user(mask, &sc->oldmask);
171 * Determine which stack to use..
173 static inline void __user *
174 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
176 /* This is the X/Open sanctioned signal stack switching. */
177 if (ka->sa.sa_flags & SA_ONSTACK) {
178 if (sas_ss_flags(sp) == 0)
179 sp = current->sas_ss_sp + current->sas_ss_size;
182 return (void __user *)((sp - frame_size) & -8ul);
185 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
186 sigset_t *set, struct pt_regs *regs)
188 struct rt_sigframe __user *frame;
192 frame = get_sigframe(ka, regs->spu, sizeof(*frame));
194 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
197 signal = current_thread_info()->exec_domain
198 && current_thread_info()->exec_domain->signal_invmap
200 ? current_thread_info()->exec_domain->signal_invmap[sig]
203 err |= __put_user(signal, &frame->sig);
207 err |= __put_user(&frame->info, &frame->pinfo);
208 err |= __put_user(&frame->uc, &frame->puc);
209 err |= copy_siginfo_to_user(&frame->info, info);
213 /* Create the ucontext. */
214 err |= __put_user(0, &frame->uc.uc_flags);
215 err |= __put_user(0, &frame->uc.uc_link);
216 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
217 err |= __put_user(sas_ss_flags(regs->spu),
218 &frame->uc.uc_stack.ss_flags);
219 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
220 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
221 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
225 /* Set up to return from userspace. */
226 regs->lr = (unsigned long)ka->sa.sa_restorer;
228 /* Set up registers for signal handler */
229 regs->spu = (unsigned long)frame;
230 regs->r0 = signal; /* Arg for signal handler */
231 regs->r1 = (unsigned long)&frame->info;
232 regs->r2 = (unsigned long)&frame->uc;
233 regs->bpc = (unsigned long)ka->sa.sa_handler;
238 printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
239 current->comm, current->pid, frame, regs->pc);
245 force_sigsegv(sig, current);
249 static int prev_insn(struct pt_regs *regs)
252 if (get_user(inst, (u16 __user *)(regs->bpc - 2)))
254 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
258 regs->syscall_nr = -1;
263 * OK, we're invoking a handler
267 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
268 struct pt_regs *regs)
270 /* Are we from a system call? */
271 if (regs->syscall_nr >= 0) {
272 /* If so, check system call restarting.. */
274 case -ERESTART_RESTARTBLOCK:
275 case -ERESTARTNOHAND:
280 if (!(ka->sa.sa_flags & SA_RESTART)) {
285 case -ERESTARTNOINTR:
286 regs->r0 = regs->orig_r0;
287 if (prev_insn(regs) < 0)
292 /* Set up the stack frame */
293 if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs))
296 signal_delivered(sig, info, ka, regs, 0);
300 * Note that 'init' is a special process: it doesn't get signals it doesn't
301 * want to handle. Thus you cannot kill init even with a SIGKILL even by
304 static void do_signal(struct pt_regs *regs)
308 struct k_sigaction ka;
311 * We want the common case to go fast, which
312 * is why we may in certain cases get here from
313 * kernel mode. Just return without doing anything
316 if (!user_mode(regs))
319 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
321 /* Re-enable any watchpoints before delivering the
322 * signal to user space. The processor register will
323 * have been cleared if the watchpoint triggered
327 /* Whee! Actually deliver the signal. */
328 handle_signal(signr, &ka, &info, regs);
333 /* Did we come from a system call? */
334 if (regs->syscall_nr >= 0) {
335 /* Restart the system call - no handlers present */
336 if (regs->r0 == -ERESTARTNOHAND ||
337 regs->r0 == -ERESTARTSYS ||
338 regs->r0 == -ERESTARTNOINTR) {
339 regs->r0 = regs->orig_r0;
341 } else if (regs->r0 == -ERESTART_RESTARTBLOCK){
342 regs->r0 = regs->orig_r0;
343 regs->r7 = __NR_restart_syscall;
347 restore_saved_sigmask();
351 * notification of userspace execution resumption
352 * - triggered by current->work.notify_resume
354 void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
356 /* Pending single-step? */
357 if (thread_info_flags & _TIF_SINGLESTEP)
358 clear_thread_flag(TIF_SINGLESTEP);
360 /* deal with pending signal delivery */
361 if (thread_info_flags & _TIF_SIGPENDING)
364 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
365 clear_thread_flag(TIF_NOTIFY_RESUME);
366 tracehook_notify_resume(regs);