Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <asm/vdso.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <abi/regdef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #ifdef CONFIG_CPU_HAS_FPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <abi/fpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) static int restore_fpu_state(struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	struct user_fp user_fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	err = __copy_from_user(&user_fp, &sc->sc_user_fp, sizeof(user_fp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	restore_from_user_fp(&user_fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	return err;
^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 int save_fpu_state(struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct user_fp user_fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	save_to_user_fp(&user_fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	return __copy_to_user(&sc->sc_user_fp, &user_fp, sizeof(user_fp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define restore_fpu_state(sigcontext)	(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define save_fpu_state(sigcontext)	(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) struct rt_sigframe {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	 * pad[3] is compatible with the same struct defined in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	 * gcc/libgcc/config/csky/linux-unwind.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	int pad[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct siginfo info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct ucontext uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static long restore_sigcontext(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	unsigned long sr = regs->sr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	/* sc_pt_regs is structured the same as the start of pt_regs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	err |= __copy_from_user(regs, &sc->sc_pt_regs, sizeof(struct pt_regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	/* BIT(0) of regs->sr is Condition Code/Carry bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	regs->sr = (sr & ~1) | (regs->sr & 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	/* Restore the floating-point state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	err |= restore_fpu_state(sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) SYSCALL_DEFINE0(rt_sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	frame = (struct rt_sigframe __user *)regs->usp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	return regs->a0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static int setup_sigcontext(struct rt_sigframe __user *frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct sigcontext __user *sc = &frame->uc.uc_mcontext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	err |= __copy_to_user(&sc->sc_pt_regs, regs, sizeof(struct pt_regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	err |= save_fpu_state(sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static inline void __user *get_sigframe(struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct pt_regs *regs, size_t framesize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	unsigned long sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	/* Default to using normal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	sp = regs->usp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	 * If we are on the alternate signal stack and would overflow it, don't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	 * Return an always-bogus address instead so we will die with SIGSEGV.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return (void __user __force *)(-1UL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	/* This is the X/Open sanctioned signal stack switching. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	sp = sigsp(sp, ksig) - framesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	/* Align the stack frame. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	sp &= -8UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	return (void __user *)sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct csky_vdso *vdso = current->mm->context.vdso;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	frame = get_sigframe(ksig, regs, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	err |= copy_siginfo_to_user(&frame->info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	/* Create the ucontext. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	err |= __put_user(0, &frame->uc.uc_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	err |= __put_user(NULL, &frame->uc.uc_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	err |= __save_altstack(&frame->uc.uc_stack, regs->usp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	err |= setup_sigcontext(frame, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	/* Set up to return from userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	regs->lr = (unsigned long)(vdso->rt_signal_retcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	 * Set up registers for signal handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	 * Registers that we don't modify keep the value they had from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	 * user-space at the time we took the signal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	 * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	 * since some things rely on this (e.g. glibc's debug/segfault.c).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	regs->pc  = (unsigned long)ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	regs->usp = (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	regs->a0  = ksig->sig;				/* a0: signal number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	regs->a1  = (unsigned long)(&(frame->info));	/* a1: siginfo pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	regs->a2  = (unsigned long)(&(frame->uc));	/* a2: ucontext pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	sigset_t *oldset = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	rseq_signal_deliver(ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	/* Are we from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (in_syscall(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		/* Avoid additional syscall restarting via ret_from_exception */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		forget_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		/* If so, check system call restarting.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		switch (regs->a0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			regs->a0 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 				regs->a0 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			regs->a0 = regs->orig_a0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			regs->pc -= TRAP0_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		}
^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) 	/* Set up the stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	ret = setup_rt_frame(ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	signal_setup_done(ret, ksig, 0);
^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) static void do_signal(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		/* Actually deliver the signal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		handle_signal(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	/* Did we come from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (in_syscall(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		/* Avoid additional syscall restarting via ret_from_exception */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		forget_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		/* Restart the system call - no handlers present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		switch (regs->a0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			regs->a0 = regs->orig_a0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			regs->pc -= TRAP0_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			regs->a0 = regs->orig_a0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			regs_syscallid(regs) = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			regs->pc -= TRAP0_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	 * If there is no signal to deliver, we just put the saved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	 * sigmask back.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)  * notification of userspace execution resumption
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)  * - triggered by the _TIF_WORK_MASK flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) asmlinkage void do_notify_resume(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	unsigned long thread_info_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (thread_info_flags & _TIF_UPROBE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		uprobe_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	/* Handle pending signal delivery */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (thread_info_flags & _TIF_SIGPENDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		do_signal(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		rseq_handle_notify_resume(NULL, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }