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 * Do a signal return; undo the signal stack.
37 struct siginfo __user *pinfo;
41 // struct _fpstate fpstate;
45 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
50 /* Always make any pending restarted system calls return -EINTR */
51 current_thread_info()->restart_block.fn = do_no_restart_syscall;
53 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
58 /* COPY(r0); Skip r0 */
70 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
71 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
82 regs->syscall_nr = -1; /* disable syscall checks */
83 err |= __get_user(*r0_p, &sc->sc_r0);
89 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
90 unsigned long r2, unsigned long r3, unsigned long r4,
91 unsigned long r5, unsigned long r6, struct pt_regs *regs)
93 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
97 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
99 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
102 set_current_blocked(&set);
104 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
107 if (restore_altstack(&frame->uc.uc_stack))
113 force_sig(SIGSEGV, current);
118 * Set up a signal frame.
122 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
127 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
144 COPY(acc1h); /* ISA_DSP_LEVEL2 only */
145 COPY(acc1l); /* ISA_DSP_LEVEL2 only */
156 err |= __put_user(mask, &sc->oldmask);
162 * Determine which stack to use..
164 static inline void __user *
165 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
167 /* This is the X/Open sanctioned signal stack switching. */
168 if (ka->sa.sa_flags & SA_ONSTACK) {
169 if (sas_ss_flags(sp) == 0)
170 sp = current->sas_ss_sp + current->sas_ss_size;
173 return (void __user *)((sp - frame_size) & -8ul);
176 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
177 struct pt_regs *regs)
179 struct rt_sigframe __user *frame;
181 int signal, sig = ksig->sig;
183 frame = get_sigframe(&ksig->ka, regs->spu, sizeof(*frame));
185 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
188 signal = current_thread_info()->exec_domain
189 && current_thread_info()->exec_domain->signal_invmap
191 ? current_thread_info()->exec_domain->signal_invmap[sig]
194 err |= __put_user(signal, &frame->sig);
198 err |= __put_user(&frame->info, &frame->pinfo);
199 err |= __put_user(&frame->uc, &frame->puc);
200 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
204 /* Create the ucontext. */
205 err |= __put_user(0, &frame->uc.uc_flags);
206 err |= __put_user(0, &frame->uc.uc_link);
207 err |= __save_altstack(&frame->uc.uc_stack, regs->spu);
208 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
209 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
213 /* Set up to return from userspace. */
214 regs->lr = (unsigned long)ksig->ka.sa.sa_restorer;
216 /* Set up registers for signal handler */
217 regs->spu = (unsigned long)frame;
218 regs->r0 = signal; /* Arg for signal handler */
219 regs->r1 = (unsigned long)&frame->info;
220 regs->r2 = (unsigned long)&frame->uc;
221 regs->bpc = (unsigned long)ksig->ka.sa.sa_handler;
226 printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
227 current->comm, current->pid, frame, regs->pc);
233 static int prev_insn(struct pt_regs *regs)
236 if (get_user(inst, (u16 __user *)(regs->bpc - 2)))
238 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
242 regs->syscall_nr = -1;
247 * OK, we're invoking a handler
251 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
255 /* Are we from a system call? */
256 if (regs->syscall_nr >= 0) {
257 /* If so, check system call restarting.. */
259 case -ERESTART_RESTARTBLOCK:
260 case -ERESTARTNOHAND:
265 if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
270 case -ERESTARTNOINTR:
271 regs->r0 = regs->orig_r0;
272 if (prev_insn(regs) < 0)
277 /* Set up the stack frame */
278 ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
280 signal_setup_done(ret, ksig, 0);
284 * Note that 'init' is a special process: it doesn't get signals it doesn't
285 * want to handle. Thus you cannot kill init even with a SIGKILL even by
288 static void do_signal(struct pt_regs *regs)
293 * We want the common case to go fast, which
294 * is why we may in certain cases get here from
295 * kernel mode. Just return without doing anything
298 if (!user_mode(regs))
301 if (get_signal(&ksig)) {
302 /* Re-enable any watchpoints before delivering the
303 * signal to user space. The processor register will
304 * have been cleared if the watchpoint triggered
308 /* Whee! Actually deliver the signal. */
309 handle_signal(&ksig, regs);
314 /* Did we come from a system call? */
315 if (regs->syscall_nr >= 0) {
316 /* Restart the system call - no handlers present */
317 if (regs->r0 == -ERESTARTNOHAND ||
318 regs->r0 == -ERESTARTSYS ||
319 regs->r0 == -ERESTARTNOINTR) {
320 regs->r0 = regs->orig_r0;
322 } else if (regs->r0 == -ERESTART_RESTARTBLOCK){
323 regs->r0 = regs->orig_r0;
324 regs->r7 = __NR_restart_syscall;
328 restore_saved_sigmask();
332 * notification of userspace execution resumption
333 * - triggered by current->work.notify_resume
335 void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
337 /* Pending single-step? */
338 if (thread_info_flags & _TIF_SINGLESTEP)
339 clear_thread_flag(TIF_SINGLESTEP);
341 /* deal with pending signal delivery */
342 if (thread_info_flags & _TIF_SIGPENDING)
345 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
346 clear_thread_flag(TIF_NOTIFY_RESUME);
347 tracehook_notify_resume(regs);