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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*/
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/seccomp.h>
#include <kern_util.h>
#include <sysdep/ptrace.h>
#include <sysdep/ptrace_user.h>
#include <sysdep/syscalls.h>
#include <linux/time-internal.h>
#include <asm/unistd.h>
void handle_syscall(struct uml_pt_regs *r)
{
struct pt_regs *regs = container_of(r, struct pt_regs, regs);
int syscall;
/*
* If we have infinite CPU resources, then make every syscall also a
* preemption point, since we don't have any other preemption in this
* case, and kernel threads would basically never run until userspace
* went to sleep, even if said userspace interacts with the kernel in
* various ways.
*/
if (time_travel_mode == TT_MODE_INFCPU ||
time_travel_mode == TT_MODE_EXTERNAL)
schedule();
/* Initialize the syscall number and default return value. */
UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
if (syscall_trace_enter(regs))
goto out;
/* Do the seccomp check after ptrace; failures should be fast. */
if (secure_computing() == -1)
goto out;
syscall = UPT_SYSCALL_NR(r);
if (syscall >= 0 && syscall <= __NR_syscall_max)
PT_REGS_SET_SYSCALL_RETURN(regs,
EXECUTE_SYSCALL(syscall, regs));
out:
syscall_trace_leave(regs);
}
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