1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * This vDSO turns all calls into a syscall so that UML can trap them.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /* Disable profiling for userspace code */
10*4882a593Smuzhiyun #define DISABLE_BRANCH_PROFILING
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/time.h>
13*4882a593Smuzhiyun #include <linux/getcpu.h>
14*4882a593Smuzhiyun #include <asm/unistd.h>
15*4882a593Smuzhiyun
__vdso_clock_gettime(clockid_t clock,struct __kernel_old_timespec * ts)16*4882a593Smuzhiyun int __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun long ret;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun asm("syscall" : "=a" (ret) :
21*4882a593Smuzhiyun "0" (__NR_clock_gettime), "D" (clock), "S" (ts) : "memory");
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun return ret;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun int clock_gettime(clockid_t, struct __kernel_old_timespec *)
26*4882a593Smuzhiyun __attribute__((weak, alias("__vdso_clock_gettime")));
27*4882a593Smuzhiyun
__vdso_gettimeofday(struct __kernel_old_timeval * tv,struct timezone * tz)28*4882a593Smuzhiyun int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun long ret;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun asm("syscall" : "=a" (ret) :
33*4882a593Smuzhiyun "0" (__NR_gettimeofday), "D" (tv), "S" (tz) : "memory");
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return ret;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun int gettimeofday(struct __kernel_old_timeval *, struct timezone *)
38*4882a593Smuzhiyun __attribute__((weak, alias("__vdso_gettimeofday")));
39*4882a593Smuzhiyun
__vdso_time(__kernel_old_time_t * t)40*4882a593Smuzhiyun __kernel_old_time_t __vdso_time(__kernel_old_time_t *t)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun long secs;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun asm volatile("syscall"
45*4882a593Smuzhiyun : "=a" (secs)
46*4882a593Smuzhiyun : "0" (__NR_time), "D" (t) : "cc", "r11", "cx", "memory");
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return secs;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun __kernel_old_time_t time(__kernel_old_time_t *t) __attribute__((weak, alias("__vdso_time")));
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun long
__vdso_getcpu(unsigned * cpu,unsigned * node,struct getcpu_cache * unused)53*4882a593Smuzhiyun __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun /*
56*4882a593Smuzhiyun * UML does not support SMP, we can cheat here. :)
57*4882a593Smuzhiyun */
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun if (cpu)
60*4882a593Smuzhiyun *cpu = 0;
61*4882a593Smuzhiyun if (node)
62*4882a593Smuzhiyun *node = 0;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun return 0;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
68*4882a593Smuzhiyun __attribute__((weak, alias("__vdso_getcpu")));
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