Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Signal support for Hexagon processor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <asm/registers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/thread_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/vdso.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) struct rt_sigframe {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	unsigned long tramp[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct siginfo info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct ucontext uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 			  size_t frame_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	unsigned long sp = sigsp(regs->r29, ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	return (void __user *)((sp - frame_size) & ~(sizeof(long long) - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	unsigned long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	err |= copy_to_user(&sc->sc_regs.r0, &regs->r00,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			    32*sizeof(unsigned long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	err |= __put_user(regs->sa0, &sc->sc_regs.sa0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	err |= __put_user(regs->lc0, &sc->sc_regs.lc0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	err |= __put_user(regs->sa1, &sc->sc_regs.sa1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	err |= __put_user(regs->lc1, &sc->sc_regs.lc1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	err |= __put_user(regs->m0, &sc->sc_regs.m0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	err |= __put_user(regs->m1, &sc->sc_regs.m1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	err |= __put_user(regs->usr, &sc->sc_regs.usr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	err |= __put_user(regs->preds, &sc->sc_regs.p3_0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	err |= __put_user(regs->gp, &sc->sc_regs.gp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	err |= __put_user(regs->ugp, &sc->sc_regs.ugp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) #if CONFIG_HEXAGON_ARCH_VERSION >= 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	err |= __put_user(regs->cs0, &sc->sc_regs.cs0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	err |= __put_user(regs->cs1, &sc->sc_regs.cs1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	tmp = pt_elr(regs); err |= __put_user(tmp, &sc->sc_regs.pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	tmp = pt_cause(regs); err |= __put_user(tmp, &sc->sc_regs.cause);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	tmp = pt_badva(regs); err |= __put_user(tmp, &sc->sc_regs.badva);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static int restore_sigcontext(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 			      struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	unsigned long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	err |= copy_from_user(&regs->r00, &sc->sc_regs.r0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			      32 * sizeof(unsigned long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	err |= __get_user(regs->sa0, &sc->sc_regs.sa0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	err |= __get_user(regs->lc0, &sc->sc_regs.lc0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	err |= __get_user(regs->sa1, &sc->sc_regs.sa1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	err |= __get_user(regs->lc1, &sc->sc_regs.lc1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	err |= __get_user(regs->m0, &sc->sc_regs.m0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	err |= __get_user(regs->m1, &sc->sc_regs.m1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	err |= __get_user(regs->usr, &sc->sc_regs.usr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	err |= __get_user(regs->preds, &sc->sc_regs.p3_0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	err |= __get_user(regs->gp, &sc->sc_regs.gp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	err |= __get_user(regs->ugp, &sc->sc_regs.ugp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) #if CONFIG_HEXAGON_ARCH_VERSION >= 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	err |= __get_user(regs->cs0, &sc->sc_regs.cs0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	err |= __get_user(regs->cs1, &sc->sc_regs.cs1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	err |= __get_user(tmp, &sc->sc_regs.pc); pt_set_elr(regs, tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  * Setup signal stack frame with siginfo structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			  struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct hexagon_vdso *vdso = current->mm->context.vdso;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (!access_ok(frame, sizeof(struct rt_sigframe)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if (copy_siginfo_to_user(&frame->info, &ksig->info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	/* The on-stack signal trampoline is no longer executed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	 * however, the libgcc signal frame unwinding code checks for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	 * the presence of these two numeric magic values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	err |= __put_user(0x7800d166, &frame->tramp[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	err |= __put_user(0x5400c004, &frame->tramp[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	err |= __save_altstack(&frame->uc.uc_stack, user_stack_pointer(regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	/* Load r0/r1 pair with signumber/siginfo pointer... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	regs->r0100 = ((unsigned long long)((unsigned long)&frame->info) << 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		| (unsigned long long)ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	regs->r02 = (unsigned long) &frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	regs->r31 = (unsigned long) vdso->rt_signal_trampoline;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	pt_psp(regs) = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	pt_set_elr(regs, (unsigned long)ksig->ka.sa.sa_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * Setup invocation of signal handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	 * If we're handling a signal that aborted a system call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	 * set up the error return value before adding the signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	 * frame to the stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (regs->syscall_nr >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		switch (regs->r00) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			regs->r00 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				regs->r00 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			regs->r06 = regs->syscall_nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			pt_set_elr(regs, pt_elr(regs) - 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			regs->r00 = regs->restart_r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	 * Set up the stack frame; not doing the SA_SIGINFO thing.  We
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	 * only set up the rt_frame flavor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	/* If there was an error on setup, no signal was delivered. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * Called from return-from-event code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) void do_signal(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		handle_signal(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	 * No (more) signals; if we came from a system call, handle the restart.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	if (regs->syscall_nr >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		switch (regs->r00) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			regs->r06 = regs->syscall_nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			regs->r06 = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			goto no_restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		pt_set_elr(regs, pt_elr(regs) - 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		regs->r00 = regs->restart_r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) no_restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	/* If there's no signal to deliver, put the saved sigmask back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * Architecture-specific wrappers for signal-related system calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) asmlinkage int sys_rt_sigreturn(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	sigset_t blocked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	frame = (struct rt_sigframe __user *)pt_psp(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (__copy_from_user(&blocked, &frame->uc.uc_sigmask, sizeof(blocked)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	set_current_blocked(&blocked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	/* Restore the user's stack as well */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	pt_psp(regs) = regs->r29;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	regs->syscall_nr = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	return regs->r00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }