1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// System call support for the VDSO.
//
// Provides fallback system call interfaces for getcpu()
// and clock_gettime().
#ifndef VDSO_SYSCALLS_H_
#define VDSO_SYSCALLS_H_
#include <asm/unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/types.h>
struct getcpu_cache;
namespace vdso {
static inline int sys_clock_gettime(clockid_t clock, struct timespec* ts) {
int num = __NR_clock_gettime;
asm volatile("syscall\n"
: "+a"(num)
: "D"(clock), "S"(ts)
: "rcx", "r11", "memory");
return num;
}
static inline int sys_getcpu(unsigned* cpu, unsigned* node,
struct getcpu_cache* cache) {
int num = __NR_getcpu;
asm volatile("syscall\n"
: "+a"(num)
: "D"(cpu), "S"(node), "d"(cache)
: "rcx", "r11", "memory");
return num;
}
} // namespace vdso
#endif // VDSO_SYSCALLS_H_
|
