1/*
 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 3 * Licensed under the GPL
 4 */
 5
 6#include <linux/kernel.h>
 7#include <linux/ptrace.h>
 8#include <linux/seccomp.h>
 9#include <kern_util.h>
10#include <sysdep/ptrace.h>
11#include <sysdep/ptrace_user.h>
12#include <sysdep/syscalls.h>
13
14void handle_syscall(struct uml_pt_regs *r)
15{
16	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
17	int syscall;
18
19	/* Initialize the syscall number and default return value. */
20	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
21	PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
22
23	if (syscall_trace_enter(regs))
24		goto out;
25
26	/* Do the seccomp check after ptrace; failures should be fast. */
27	if (secure_computing(NULL) == -1)
28		goto out;
29
30	syscall = UPT_SYSCALL_NR(r);
31	if (syscall >= 0 && syscall <= __NR_syscall_max)
32		PT_REGS_SET_SYSCALL_RETURN(regs,
33				EXECUTE_SYSCALL(syscall, regs));
34
35out:
36	syscall_trace_leave(regs);
37}