Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  *  linux/arch/h8300/kernel/signal.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * License.  See the file COPYING in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *                and David McCullough <davidm@snapgear.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * Based on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  * Linux/m68k by Hamish Macdonald
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * Atari :-) Current limitation: Only one sigstack can be active at one time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * signal handlers!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include <linux/highuid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * Do a signal return; undo the signal stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * Keep the return code on the stack quadword aligned!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * That makes the cache flush below easier.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) struct rt_sigframe {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	long dummy_er0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	long dummy_vector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) #if defined(CONFIG_CPU_H8S)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	short dummy_exr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	long dummy_pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	char *pretcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	struct siginfo *pinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	void *puc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	unsigned char retcode[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	struct siginfo info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	struct ucontext uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	int sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) } __packed __aligned(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) restore_sigcontext(struct sigcontext *usc, int *pd0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	unsigned int ccr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	unsigned int usp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	unsigned int er0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	/* restore passed registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) #define COPY(r)  do { err |= get_user(regs->r, &usc->sc_##r); } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	COPY(er1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	COPY(er2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	COPY(er3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	COPY(er5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	COPY(pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	ccr = regs->ccr & 0x10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	COPY(ccr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) #undef COPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	regs->ccr &= 0xef;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	regs->ccr |= ccr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	regs->orig_er0 = -1;		/* disable syscall checks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	err |= __get_user(usp, &usc->sc_usp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	regs->sp = usp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	err |= __get_user(er0, &usc->sc_er0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	*pd0 = er0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) asmlinkage int sys_rt_sigreturn(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	unsigned long usp = rdusp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	int er0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (restore_sigcontext(&frame->uc.uc_mcontext, &er0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	return er0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			     unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	err |= __put_user(regs->er0, &sc->sc_er0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	err |= __put_user(regs->er1, &sc->sc_er1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	err |= __put_user(regs->er2, &sc->sc_er2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	err |= __put_user(regs->er3, &sc->sc_er3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	err |= __put_user(regs->er4, &sc->sc_er4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	err |= __put_user(regs->er5, &sc->sc_er5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	err |= __put_user(regs->er6, &sc->sc_er6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	err |= __put_user(rdusp(),   &sc->sc_usp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	err |= __put_user(regs->pc,  &sc->sc_pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	err |= __put_user(regs->ccr, &sc->sc_ccr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	err |= __put_user(mask,      &sc->sc_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static inline void __user *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return (void __user *)((sigsp(rdusp(), ksig) - frame_size) & -8UL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			  struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	struct rt_sigframe *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	unsigned char *ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	frame = get_sigframe(ksig, regs, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		err |= copy_siginfo_to_user(&frame->info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	/* Create the ucontext.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	err |= __put_user(0, &frame->uc.uc_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	err |= __put_user(0, &frame->uc.uc_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	err |= __save_altstack(&frame->uc.uc_stack, rdusp());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	/* Set up to return from userspace.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	ret = (unsigned char *)&frame->retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (ksig->ka.sa.sa_flags & SA_RESTORER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		ret = (unsigned char *)(ksig->ka.sa.sa_restorer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		/* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		err |= __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 				  (unsigned long *)(frame->retcode + 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		err |= __put_user(0x5700,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 				  (unsigned short *)(frame->retcode + 4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	err |= __put_user(ret, &frame->pretcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	/* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	regs->sp  = (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	regs->pc  = (unsigned long)ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	regs->er0 = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	regs->er1 = (unsigned long)&(frame->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	regs->er2 = (unsigned long)&frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	regs->er5 = current->mm->start_data;	/* GOT base */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) handle_restart(struct pt_regs *regs, struct k_sigaction *ka)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	switch (regs->er0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		if (!ka)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			goto do_restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		regs->er0 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		if (!ka) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			regs->er0 = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			regs->pc -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			regs->er0 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		if (!(ka->sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			regs->er0 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) do_restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		regs->er0 = regs->orig_er0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		regs->pc -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  * OK, we're invoking a handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) handle_signal(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	sigset_t *oldset = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	/* are we from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	if (regs->orig_er0 >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		handle_restart(regs, &ksig->ka);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	ret = setup_rt_frame(ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	signal_setup_done(ret, ksig, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)  * Note that 'init' is a special process: it doesn't get signals it doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)  * want to handle. Thus you cannot kill init even with a SIGKILL even by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)  * mistake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static void do_signal(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	current->thread.esp0 = (unsigned long) regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		/* Whee!  Actually deliver the signal.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		handle_signal(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	/* Did we come from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (regs->orig_er0 >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		handle_restart(regs, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	/* If there's no signal to deliver, we just restore the saved mask.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (thread_info_flags & _TIF_SIGPENDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		do_signal(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (thread_info_flags & _TIF_NOTIFY_RESUME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }