67c3c7de41
The VDSO functions are defined as globals and intended to be called from userspace. Let's just workaround the -Wmissing-prototypes warnings by declaring them locally. This will address below -Wmissing-prototypes warnings: arch/x86/um/vdso/um_vdso.c:16:5: warning: no previous prototype for ‘__vdso_clock_gettime’ [-Wmissing-prototypes] arch/x86/um/vdso/um_vdso.c:30:5: warning: no previous prototype for ‘__vdso_gettimeofday’ [-Wmissing-prototypes] arch/x86/um/vdso/um_vdso.c:44:21: warning: no previous prototype for ‘__vdso_time’ [-Wmissing-prototypes] arch/x86/um/vdso/um_vdso.c:57:1: warning: no previous prototype for ‘__vdso_getcpu’ [-Wmissing-prototypes] While at it, also fix the "WARNING: Prefer 'unsigned int *' to bare use of 'unsigned *'" checkpatch warning. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
|
|
*
|
|
* This vDSO turns all calls into a syscall so that UML can trap them.
|
|
*/
|
|
|
|
|
|
/* Disable profiling for userspace code */
|
|
#define DISABLE_BRANCH_PROFILING
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/getcpu.h>
|
|
#include <asm/unistd.h>
|
|
|
|
/* workaround for -Wmissing-prototypes warnings */
|
|
int __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts);
|
|
int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
|
|
__kernel_old_time_t __vdso_time(__kernel_old_time_t *t);
|
|
long __vdso_getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *unused);
|
|
|
|
int __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
|
|
{
|
|
long ret;
|
|
|
|
asm("syscall"
|
|
: "=a" (ret)
|
|
: "0" (__NR_clock_gettime), "D" (clock), "S" (ts)
|
|
: "rcx", "r11", "memory");
|
|
|
|
return ret;
|
|
}
|
|
int clock_gettime(clockid_t, struct __kernel_old_timespec *)
|
|
__attribute__((weak, alias("__vdso_clock_gettime")));
|
|
|
|
int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
|
|
{
|
|
long ret;
|
|
|
|
asm("syscall"
|
|
: "=a" (ret)
|
|
: "0" (__NR_gettimeofday), "D" (tv), "S" (tz)
|
|
: "rcx", "r11", "memory");
|
|
|
|
return ret;
|
|
}
|
|
int gettimeofday(struct __kernel_old_timeval *, struct timezone *)
|
|
__attribute__((weak, alias("__vdso_gettimeofday")));
|
|
|
|
__kernel_old_time_t __vdso_time(__kernel_old_time_t *t)
|
|
{
|
|
long secs;
|
|
|
|
asm volatile("syscall"
|
|
: "=a" (secs)
|
|
: "0" (__NR_time), "D" (t) : "cc", "r11", "cx", "memory");
|
|
|
|
return secs;
|
|
}
|
|
__kernel_old_time_t time(__kernel_old_time_t *t) __attribute__((weak, alias("__vdso_time")));
|
|
|
|
long
|
|
__vdso_getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *unused)
|
|
{
|
|
/*
|
|
* UML does not support SMP, we can cheat here. :)
|
|
*/
|
|
|
|
if (cpu)
|
|
*cpu = 0;
|
|
if (node)
|
|
*node = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
long getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *tcache)
|
|
__attribute__((weak, alias("__vdso_getcpu")));
|