1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> |
4 | * |
5 | * This vDSO turns all calls into a syscall so that UML can trap them. |
6 | */ |
7 | |
8 | |
9 | /* Disable profiling for userspace code */ |
10 | #define DISABLE_BRANCH_PROFILING |
11 | |
12 | #include <linux/time.h> |
13 | #include <linux/getcpu.h> |
14 | #include <asm/unistd.h> |
15 | |
16 | int __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts) |
17 | { |
18 | long ret; |
19 | |
20 | asm("syscall" |
21 | : "=a" (ret) |
22 | : "0" (__NR_clock_gettime), "D" (clock), "S" (ts) |
23 | : "rcx" , "r11" , "memory" ); |
24 | |
25 | return ret; |
26 | } |
27 | int clock_gettime(clockid_t, struct __kernel_old_timespec *) |
28 | __attribute__((weak, alias("__vdso_clock_gettime" ))); |
29 | |
30 | int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) |
31 | { |
32 | long ret; |
33 | |
34 | asm("syscall" |
35 | : "=a" (ret) |
36 | : "0" (__NR_gettimeofday), "D" (tv), "S" (tz) |
37 | : "rcx" , "r11" , "memory" ); |
38 | |
39 | return ret; |
40 | } |
41 | int gettimeofday(struct __kernel_old_timeval *, struct timezone *) |
42 | __attribute__((weak, alias("__vdso_gettimeofday" ))); |
43 | |
44 | __kernel_old_time_t __vdso_time(__kernel_old_time_t *t) |
45 | { |
46 | long secs; |
47 | |
48 | asm volatile("syscall" |
49 | : "=a" (secs) |
50 | : "0" (__NR_time), "D" (t) : "cc" , "r11" , "cx" , "memory" ); |
51 | |
52 | return secs; |
53 | } |
54 | __kernel_old_time_t time(__kernel_old_time_t *t) __attribute__((weak, alias("__vdso_time" ))); |
55 | |
56 | long |
57 | __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) |
58 | { |
59 | /* |
60 | * UML does not support SMP, we can cheat here. :) |
61 | */ |
62 | |
63 | if (cpu) |
64 | *cpu = 0; |
65 | if (node) |
66 | *node = 0; |
67 | |
68 | return 0; |
69 | } |
70 | |
71 | long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache) |
72 | __attribute__((weak, alias("__vdso_getcpu" ))); |
73 | |