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 <linux/tracehook.h>
25 #include <asm/cacheflush.h>
26 #include <asm/ucontext.h>
27 #include <asm/uaccess.h>
31 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
34 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
35 unsigned long r2, unsigned long r3, unsigned long r4,
36 unsigned long r5, unsigned long r6, struct pt_regs *regs)
38 return do_sigaltstack(uss, uoss, regs->spu);
43 * Do a signal return; undo the signal stack.
49 struct siginfo __user *pinfo;
53 // struct _fpstate fpstate;
57 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
62 /* Always make any pending restarted system calls return -EINTR */
63 current_thread_info()->restart_block.fn = do_no_restart_syscall;
65 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
70 /* COPY(r0); Skip r0 */
82 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
83 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
94 regs->syscall_nr = -1; /* disable syscall checks */
95 err |= __get_user(*r0_p, &sc->sc_r0);
101 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
102 unsigned long r2, unsigned long r3, unsigned long r4,
103 unsigned long r5, unsigned long r6, struct pt_regs *regs)
105 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
109 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
111 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
114 sigdelsetmask(&set, ~_BLOCKABLE);
115 set_current_blocked(&set);
117 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
120 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
126 force_sig(SIGSEGV, current);
131 * Set up a signal frame.
135 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
140 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
157 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
158 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
169 err |= __put_user(mask, &sc->oldmask);
175 * Determine which stack to use..
177 static inline void __user *
178 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
180 /* This is the X/Open sanctioned signal stack switching. */
181 if (ka->sa.sa_flags & SA_ONSTACK) {
182 if (sas_ss_flags(sp) == 0)
183 sp = current->sas_ss_sp + current->sas_ss_size;
186 return (void __user *)((sp - frame_size) & -8ul);
189 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
190 sigset_t *set, struct pt_regs *regs)
192 struct rt_sigframe __user *frame;
196 frame = get_sigframe(ka, regs->spu, sizeof(*frame));
198 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
201 signal = current_thread_info()->exec_domain
202 && current_thread_info()->exec_domain->signal_invmap
204 ? current_thread_info()->exec_domain->signal_invmap[sig]
207 err |= __put_user(signal, &frame->sig);
211 err |= __put_user(&frame->info, &frame->pinfo);
212 err |= __put_user(&frame->uc, &frame->puc);
213 err |= copy_siginfo_to_user(&frame->info, info);
217 /* Create the ucontext. */
218 err |= __put_user(0, &frame->uc.uc_flags);
219 err |= __put_user(0, &frame->uc.uc_link);
220 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
221 err |= __put_user(sas_ss_flags(regs->spu),
222 &frame->uc.uc_stack.ss_flags);
223 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
224 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
225 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
229 /* Set up to return from userspace. */
230 regs->lr = (unsigned long)ka->sa.sa_restorer;
232 /* Set up registers for signal handler */
233 regs->spu = (unsigned long)frame;
234 regs->r0 = signal; /* Arg for signal handler */
235 regs->r1 = (unsigned long)&frame->info;
236 regs->r2 = (unsigned long)&frame->uc;
237 regs->bpc = (unsigned long)ka->sa.sa_handler;
242 printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
243 current->comm, current->pid, frame, regs->pc);
249 force_sigsegv(sig, current);
253 static int prev_insn(struct pt_regs *regs)
256 if (get_user(inst, (u16 __user *)(regs->bpc - 2)))
258 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
262 regs->syscall_nr = -1;
267 * OK, we're invoking a handler
271 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
272 sigset_t *oldset, struct pt_regs *regs)
274 /* Are we from a system call? */
275 if (regs->syscall_nr >= 0) {
276 /* If so, check system call restarting.. */
278 case -ERESTART_RESTARTBLOCK:
279 case -ERESTARTNOHAND:
284 if (!(ka->sa.sa_flags & SA_RESTART)) {
289 case -ERESTARTNOINTR:
290 regs->r0 = regs->orig_r0;
291 if (prev_insn(regs) < 0)
296 /* Set up the stack frame */
297 if (setup_rt_frame(sig, ka, info, oldset, regs))
300 block_sigmask(ka, sig);
305 * Note that 'init' is a special process: it doesn't get signals it doesn't
306 * want to handle. Thus you cannot kill init even with a SIGKILL even by
309 static void do_signal(struct pt_regs *regs)
313 struct k_sigaction ka;
317 * We want the common case to go fast, which
318 * is why we may in certain cases get here from
319 * kernel mode. Just return without doing anything
322 if (!user_mode(regs))
328 if (test_thread_flag(TIF_RESTORE_SIGMASK))
329 oldset = ¤t->saved_sigmask;
331 oldset = ¤t->blocked;
333 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
335 /* Re-enable any watchpoints before delivering the
336 * signal to user space. The processor register will
337 * have been cleared if the watchpoint triggered
341 /* Whee! Actually deliver the signal. */
342 if (handle_signal(signr, &ka, &info, oldset, regs) == 0)
343 clear_thread_flag(TIF_RESTORE_SIGMASK);
349 /* Did we come from a system call? */
350 if (regs->syscall_nr >= 0) {
351 /* Restart the system call - no handlers present */
352 if (regs->r0 == -ERESTARTNOHAND ||
353 regs->r0 == -ERESTARTSYS ||
354 regs->r0 == -ERESTARTNOINTR) {
355 regs->r0 = regs->orig_r0;
357 } else if (regs->r0 == -ERESTART_RESTARTBLOCK){
358 regs->r0 = regs->orig_r0;
359 regs->r7 = __NR_restart_syscall;
363 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
364 clear_thread_flag(TIF_RESTORE_SIGMASK);
365 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
370 * notification of userspace execution resumption
371 * - triggered by current->work.notify_resume
373 void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
375 /* Pending single-step? */
376 if (thread_info_flags & _TIF_SINGLESTEP)
377 clear_thread_flag(TIF_SINGLESTEP);
379 /* deal with pending signal delivery */
380 if (thread_info_flags & _TIF_SIGPENDING)
383 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
384 clear_thread_flag(TIF_NOTIFY_RESUME);
385 tracehook_notify_resume(regs);
386 if (current->replacement_session_keyring)
387 key_replace_session_keyring();
390 clear_thread_flag(TIF_IRET);