Commit 0b523a85 authored by Goran Ferenc's avatar Goran Ferenc Committed by Ralf Baechle

MIPS: VDSO: Add implementation of gettimeofday() fallback

This patch adds gettimeofday_fallback() function that wraps assembly
invocation of gettimeofday() syscall using __NR_gettimeofday.

This function is used if pure VDSO implementation gettimeofday()
does not succeed for any reason. Its imeplementation is enclosed in
"#ifdef CONFIG_MIPS_CLOCK_VSYSCALL" to be in sync with the similar
arrangement for __vdso_gettimeofday().

If syscall invocation via __NR_gettimeofday fails, register a3 will
be set. So, after the syscall, register a3 is tested and the return
valuem is negated if it's set.
Signed-off-by: default avatarGoran Ferenc <>
Signed-off-by: default avatarMiodrag Dinic <>
Signed-off-by: default avatarAleksandar Markovic <>
Cc: Douglas Leung <>
Cc: James Hogan <>
Cc: Paul Burton <>
Cc: Petar Jovanovic <>
Cc: Raghu Gandham <>
Patchwork: default avatarRalf Baechle <>
parent 180902e0
......@@ -20,6 +20,28 @@
#include <asm/unistd.h>
#include <asm/vdso.h>
static __always_inline long gettimeofday_fallback(struct timeval *_tv,
struct timezone *_tz)
register struct timezone *tz asm("a1") = _tz;
register struct timeval *tv asm("a0") = _tv;
register long ret asm("v0");
register long nr asm("v0") = __NR_gettimeofday;
register long error asm("a3");
asm volatile(
" syscall\n"
: "=r" (ret), "=r" (error)
: "r" (tv), "r" (tz), "r" (nr)
: "memory");
return error ? -ret : ret;
static __always_inline long clock_gettime_fallback(clockid_t _clkid,
struct timespec *_ts)
......@@ -205,7 +227,7 @@ int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
ret = do_realtime(&ts, data);
if (ret)
return ret;
return gettimeofday_fallback(tv, tz);
if (tv) {
tv->tv_sec = ts.tv_sec;
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