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)  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/seccomp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <kern_util.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sysdep/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <sysdep/ptrace_user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <sysdep/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/time-internal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) void handle_syscall(struct uml_pt_regs *r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	int syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	 * If we have infinite CPU resources, then make every syscall also a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	 * preemption point, since we don't have any other preemption in this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	 * case, and kernel threads would basically never run until userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	 * went to sleep, even if said userspace interacts with the kernel in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	 * various ways.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (time_travel_mode == TT_MODE_INFCPU ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	    time_travel_mode == TT_MODE_EXTERNAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	/* Initialize the syscall number and default return value. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	if (syscall_trace_enter(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	/* Do the seccomp check after ptrace; failures should be fast. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	if (secure_computing() == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	syscall = UPT_SYSCALL_NR(r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	if (syscall >= 0 && syscall <= __NR_syscall_max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		PT_REGS_SET_SYSCALL_RETURN(regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 				EXECUTE_SYSCALL(syscall, regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	syscall_trace_leave(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }