1/*
2 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This vDSO turns all calls into a syscall so that UML can trap them.
9 */
10
11
12/* Disable profiling for userspace code */
13#define DISABLE_BRANCH_PROFILING
14
15#include <linux/time.h>
16#include <linux/getcpu.h>
17#include <asm/unistd.h>
18
19int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
20{
21	long ret;
22
23	asm("syscall" : "=a" (ret) :
24		"0" (__NR_clock_gettime), "D" (clock), "S" (ts) : "memory");
25
26	return ret;
27}
28int clock_gettime(clockid_t, struct timespec *)
29	__attribute__((weak, alias("__vdso_clock_gettime")));
30
31int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
32{
33	long ret;
34
35	asm("syscall" : "=a" (ret) :
36		"0" (__NR_gettimeofday), "D" (tv), "S" (tz) : "memory");
37
38	return ret;
39}
40int gettimeofday(struct timeval *, struct timezone *)
41	__attribute__((weak, alias("__vdso_gettimeofday")));
42
43time_t __vdso_time(time_t *t)
44{
45	long secs;
46
47	asm volatile("syscall"
48		: "=a" (secs)
49		: "0" (__NR_time), "D" (t) : "cc", "r11", "cx", "memory");
50
51	return secs;
52}
53int time(time_t *t) __attribute__((weak, alias("__vdso_time")));
54
55long
56__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
57{
58	/*
59	 * UML does not support SMP, we can cheat here. :)
60	 */
61
62	if (cpu)
63		*cpu = 0;
64	if (node)
65		*node = 0;
66
67	return 0;
68}
69
70long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
71	__attribute__((weak, alias("__vdso_getcpu")));
72