1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 
 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#include <linux/time-internal.h>
14#include <asm/unistd.h>
15#include <asm/delay.h>
16
17void handle_syscall(struct uml_pt_regs *r)
18{
19	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
 
20	int syscall;
21
22	/* Initialize the syscall number and default return value. */
23	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
24	PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
25
26	if (syscall_trace_enter(regs))
27		goto out;
28
29	/* Do the seccomp check after ptrace; failures should be fast. */
30	if (secure_computing() == -1)
31		goto out;
32
 
 
 
 
 
 
 
 
 
33	syscall = UPT_SYSCALL_NR(r);
34	if (syscall >= 0 && syscall < __NR_syscalls) {
35		unsigned long ret = EXECUTE_SYSCALL(syscall, regs);
36
37		PT_REGS_SET_SYSCALL_RETURN(regs, ret);
38
39		/*
40		 * An error value here can be some form of -ERESTARTSYS
41		 * and then we'd just loop. Make any error syscalls take
42		 * some time, so that it won't just loop if something is
43		 * not ready, and hopefully other things will make some
44		 * progress.
45		 */
46		if (IS_ERR_VALUE(ret) &&
47		    (time_travel_mode == TT_MODE_INFCPU ||
48		     time_travel_mode == TT_MODE_EXTERNAL)) {
49			um_udelay(1);
50			schedule();
51		}
52	}
53
54out:
55	syscall_trace_leave(regs);
56}

 
 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 "kern_util.h"
 9#include "sysdep/ptrace.h"
10#include "sysdep/syscalls.h"
11
12extern int syscall_table_size;
13#define NR_SYSCALLS (syscall_table_size / sizeof(void *))
 
 
14
15void handle_syscall(struct uml_pt_regs *r)
16{
17	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
18	long result;
19	int syscall;
20
21	syscall_trace(r, 0);
 
 
 
 
 
 
 
 
 
22
23	/*
24	 * This should go in the declaration of syscall, but when I do that,
25	 * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
26	 * children at all, sometimes hanging when bash doesn't see the first
27	 * ls exit.
28	 * The assembly looks functionally the same to me.  This is
29	 *     gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
30	 * in case it's a compiler bug.
31	 */
32	syscall = UPT_SYSCALL_NR(r);
33	if ((syscall >= NR_SYSCALLS) || (syscall < 0))
34		result = -ENOSYS;
35	else result = EXECUTE_SYSCALL(syscall, regs);
 
36
37	REGS_SET_SYSCALL_RETURN(r->gp, result);
 
 
 
 
 
 
 
 
 
 
 
 
 
38
39	syscall_trace(r, 1);
 
40}