riscv/kernel/signal.c

42 static long restore_fp_state(struct pt_regs *regs,
52 	fstate_restore(current, regs);
56 static long save_fp_state(struct pt_regs *regs,
62 	fstate_save(current, regs);
67 #define save_fp_state(task, regs) (0)
68 #define restore_fp_state(task, regs) (0)
73 static long save_v_state(struct pt_regs *regs, void __user **sc_vec)
90 	riscv_v_vstate_save(&current->thread.vstate, regs);
116 static long __restore_v_state(struct pt_regs *regs, void __user *sc_vec)
127 	riscv_v_vstate_set_restore(current, regs);
146 #define save_v_state(task, regs) (0)
147 #define __restore_v_state(task, regs) (0)
150 static long restore_sigcontext(struct pt_regs *regs,
157 	err = __copy_from_user(regs, &sc->sc_regs, sizeof(sc->sc_regs));
163 		err = restore_fp_state(regs, &sc->sc_fpregs);
192 			if (!has_vector() || !riscv_v_vstate_query(regs) ||
196 			err = __restore_v_state(regs, sc_ext_ptr);
233 	struct pt_regs *regs = current_pt_regs();
242 	frame = (struct rt_sigframe __user *)regs->sp;
252 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
258 	regs->cause = -1UL;
260 	return regs->a0;
268 			frame, (void *)regs->epc, (void *)regs->sp);
275 	struct pt_regs *regs)
282 	err = __copy_to_user(&sc->sc_regs, regs, sizeof(sc->sc_regs));
285 		err |= save_fp_state(regs, &sc->sc_fpregs);
287 	if (has_vector() && riscv_v_vstate_query(regs))
288 		err |= save_v_state(regs, (void __user **)&sc_ext_ptr);
299 	struct pt_regs *regs, size_t framesize)
303 	sp = regs->sp;
322 	struct pt_regs *regs)
329 	frame = get_sigframe(ksig, regs, frame_size);
338 	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
339 	err |= setup_sigcontext(frame, regs);
346 	regs->ra = (unsigned long)VDSO_SYMBOL(
361 	regs->ra = addr;
371 	regs->epc = (unsigned long)ksig->ka.sa.sa_handler;
372 	regs->sp = (unsigned long)frame;
373 	regs->a0 = ksig->sig;                     /* a0: signal number */
374 	regs->a1 = (unsigned long)(&frame->info); /* a1: siginfo pointer */
375 	regs->a2 = (unsigned long)(&frame->uc);   /* a2: ucontext pointer */
380 		(void *)regs->epc, (void *)regs->ra, frame);
386 static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
391 	rseq_signal_deliver(ksig, regs);
395 		ret = compat_setup_rt_frame(ksig, oldset, regs);
397 		ret = setup_rt_frame(ksig, oldset, regs);
402 void arch_do_signal_or_restart(struct pt_regs *regs)
407 	bool syscall = (regs->cause == EXC_SYSCALL);
411 		continue_addr = regs->epc;
413 		retval = regs->a0;
416 		regs->cause = -1UL;
427 			regs->a0 = regs->orig_a0;
428 			regs->epc = restart_addr;
443 		if (regs->epc == restart_addr &&
448 			regs->a0 = -EINTR;
449 			regs->epc = continue_addr;
453 		handle_signal(&ksig, regs);
461 	if (syscall && regs->epc == restart_addr && retval == -ERESTART_RESTARTBLOCK)
462 		regs->a7 = __NR_restart_syscall;