openrisc/kernel/signal.c

38 asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs);
40 asmlinkage int do_work_pending(struct pt_regs *regs, unsigned int thread_flags,
74 static int restore_sigcontext(struct pt_regs *regs,
83 	 * Restore the regs from &sc->regs.
87 	err |= __copy_from_user(regs, sc->regs.gpr, 32 * sizeof(unsigned long));
88 	err |= __copy_from_user(&regs->pc, &sc->regs.pc, sizeof(unsigned long));
89 	err |= __copy_from_user(&regs->sr, &sc->regs.sr, sizeof(unsigned long));
93 	regs->sr &= ~SPR_SR_SM;
95 	regs->orig_gpr11 = -1;	/* Avoid syscall restart checks */
97 	/* TODO: the other ports use regs->orig_XX to disable syscall checks
105 asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs)
107 	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->sp;
125 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
131 	return regs->gpr[11];
142 static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
146 	/* copy the regs */
150 	err |= __copy_to_user(sc->regs.gpr, regs, 32 * sizeof(unsigned long));
151 	err |= __copy_to_user(&sc->regs.pc, &regs->pc, sizeof(unsigned long));
152 	err |= __copy_to_user(&sc->regs.sr, &regs->sr, sizeof(unsigned long));
169 					struct pt_regs *regs, size_t frame_size)
171 	unsigned long sp = regs->sp;
189 			  struct pt_regs *regs)
195 	frame = get_sigframe(ksig, regs, sizeof(*frame));
207 	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
208 	err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
230 	regs->pc = (unsigned long)ksig->ka.sa.sa_handler; /* what we enter NOW */
231 	regs->gpr[9] = (unsigned long)return_ip;     /* what we enter LATER */
232 	regs->gpr[3] = (unsigned long)ksig->sig;           /* arg 1: signo */
233 	regs->gpr[4] = (unsigned long)&frame->info;  /* arg 2: (siginfo_t*) */
234 	regs->gpr[5] = (unsigned long)&frame->uc;    /* arg 3: ucontext */
237 	regs->sp = (unsigned long)frame;
243 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
247 	ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
257  * Also note that the regs structure given here as an argument, is the latest
260  * we can use user_mode(regs) to see if we came directly from kernel or user
264 static int do_signal(struct pt_regs *regs, int syscall)
273 		continue_addr = regs->pc;
275 		retval = regs->gpr[11];
289 			regs->gpr[11] = regs->orig_gpr11;
290 			regs->pc = restart_addr;
302 		if (unlikely(restart) && regs->pc == restart_addr) {
308 				regs->gpr[11] = -EINTR;
309 				regs->pc = continue_addr;
312 		handle_signal(&ksig, regs);
320 		if (unlikely(restart) && regs->pc == restart_addr) {
321 			regs->pc = continue_addr;
330 do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
336 			if (unlikely(!user_mode(regs)))
340 				int restart = do_signal(regs, syscall);
351 				resume_user_mode_work(regs);