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Date: Mon, 3 Feb 2014 08:48:41 +0100
From: stefani@...bold.net
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
hpa@...or.com, ak@...ux.intel.com, aarcange@...hat.com,
john.stultz@...aro.org, luto@...capital.net, xemul@...allels.com,
gorcunov@...nvz.org, andriy.shevchenko@...ux.intel.com
Cc: Martin.Runge@...de-schwarz.com, Andreas.Brief@...de-schwarz.com,
Stefani Seibold <stefani@...bold.net>
Subject: [PATCH v10 8/8] Add 32 bit VDSO time support for 64 bit kernel
From: Stefani Seibold <stefani@...bold.net>
This patch add the VDSO time support for the IA32 Emulation Layer.
Due the nature of the kernel headers and the LP64 compiler where the
size of a long and a pointer differs against a 32 bit compiler, there
is a lot of type hacking necessary.
Signed-off-by: Stefani Seibold <stefani@...bold.net>
---
arch/x86/vdso/vclock_gettime.c | 109 +++++++++++++++++++++++++++-------
arch/x86/vdso/vdso32/vclock_gettime.c | 7 +++
2 files changed, 95 insertions(+), 21 deletions(-)
diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 42f641c..8ba8db8 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -31,12 +31,24 @@
#define gtod (&VVAR(vsyscall_gtod_data))
+struct api_timeval {
+ long tv_sec; /* seconds */
+ long tv_usec; /* microseconds */
+};
+
+struct api_timespec {
+ long tv_sec; /* seconds */
+ long tv_nsec; /* nanoseconds */
+};
+
+typedef long api_time_t;
+
static notrace cycle_t vread_hpet(void)
{
return readl((const void __iomem *)fix_to_virt(VSYSCALL_HPET) + HPET_COUNTER);
}
-notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
+notrace static long vdso_fallback_gettime(long clock, struct api_timespec *ts)
{
long ret;
asm("syscall" : "=a" (ret) :
@@ -44,7 +56,8 @@ notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
return ret;
}
-notrace static long vdso_fallback_gtod(struct timeval *tv, struct timezone *tz)
+notrace static long vdso_fallback_gtod(struct api_timeval *tv,
+ struct timezone *tz)
{
long ret;
@@ -54,14 +67,62 @@ notrace static long vdso_fallback_gtod(struct timeval *tv, struct timezone *tz)
}
#else
+#ifdef CONFIG_IA32_EMULATION
+typedef s64 arch_time_t;
+
+struct arch_timespec {
+ s64 tv_sec;
+ s64 tv_nsec;
+};
+
+#define ALIGN8 __attribute__ ((aligned (8)))
+
+struct arch_vsyscall_gtod_data {
+ seqcount_t seq ALIGN8;
+
+ struct { /* extract of a clocksource struct */
+ int vclock_mode ALIGN8;
+ cycle_t cycle_last ALIGN8;
+ cycle_t mask ALIGN8;
+ u32 mult;
+ u32 shift;
+ } clock;
+
+ /* open coded 'struct timespec' */
+ arch_time_t wall_time_sec;
+ u64 wall_time_snsec;
+ u64 monotonic_time_snsec;
+ arch_time_t monotonic_time_sec;
+
+ struct timezone sys_tz;
+ struct arch_timespec wall_time_coarse;
+ struct arch_timespec monotonic_time_coarse;
+};
+
+struct arch_vsyscall_gtod_data vvar_vsyscall_gtod_data
+ __attribute__((visibility("hidden")));
+#else
struct vsyscall_gtod_data vvar_vsyscall_gtod_data
__attribute__((visibility("hidden")));
+#endif
u8 hpet_page
__attribute__((visibility("hidden")));
#define gtod (&vvar_vsyscall_gtod_data)
+struct api_timeval {
+ s32 tv_sec; /* seconds */
+ s32 tv_usec; /* microseconds */
+};
+
+struct api_timespec {
+ s32 tv_sec; /* seconds */
+ s32 tv_nsec; /* microseconds */
+};
+
+typedef s32 api_time_t;
+
#ifdef CONFIG_HPET_TIMER
static notrace cycle_t vread_hpet(void)
{
@@ -69,7 +130,7 @@ static notrace cycle_t vread_hpet(void)
}
#endif
-notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
+notrace static long vdso_fallback_gettime(long clock, struct api_timespec *ts)
{
long ret;
@@ -79,12 +140,12 @@ notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
"call VDSO32_vsyscall \n"
"pop %%ebx \n"
: "=a" (ret)
- : "0" (__NR_clock_gettime), "d" (clock), "c" (ts)
+ : "0" (__NR_ia32_clock_gettime), "d" (clock), "c" (ts)
: "memory");
return ret;
}
-notrace static long vdso_fallback_gtod(struct timeval *tv,
+notrace static long vdso_fallback_gtod(struct api_timeval *tv,
struct timezone *tz)
{
long ret;
@@ -95,7 +156,7 @@ notrace static long vdso_fallback_gtod(struct timeval *tv,
"call VDSO32_vsyscall \n"
"pop %%ebx \n"
: "=a" (ret)
- : "0" (__NR_gettimeofday), "d" (tv), "c" (tz)
+ : "0" (__NR_ia32_gettimeofday), "d" (tv), "c" (tz)
: "memory");
return ret;
}
@@ -284,42 +345,48 @@ notrace static void do_monotonic_coarse(struct timespec *ts)
} while (unlikely(read_seqcount_retry(>od->seq, seq)));
}
-notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
+notrace int __vdso_clock_gettime(clockid_t clock, struct api_timespec *ts)
{
+ struct timespec tmp;
+
switch (clock) {
case CLOCK_REALTIME:
- if (do_realtime(ts) == VCLOCK_NONE)
+ if (do_realtime(&tmp) == VCLOCK_NONE)
goto fallback;
break;
case CLOCK_MONOTONIC:
- if (do_monotonic(ts) == VCLOCK_NONE)
+ if (do_monotonic(&tmp) == VCLOCK_NONE)
goto fallback;
break;
case CLOCK_REALTIME_COARSE:
- do_realtime_coarse(ts);
+ do_realtime_coarse(&tmp);
break;
case CLOCK_MONOTONIC_COARSE:
- do_monotonic_coarse(ts);
+ do_monotonic_coarse(&tmp);
break;
default:
goto fallback;
}
+ ts->tv_sec = tmp.tv_sec;
+ ts->tv_nsec = tmp.tv_nsec;
+
return 0;
fallback:
return vdso_fallback_gettime(clock, ts);
}
-int clock_gettime(clockid_t, struct timespec *)
+int clock_gettime(clockid_t, struct api_timespec *)
__attribute__((weak, alias("__vdso_clock_gettime")));
-notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
+notrace int __vdso_gettimeofday(struct api_timeval *tv, struct timezone *tz)
{
+ struct timespec tmp;
+
if (likely(tv != NULL)) {
- BUILD_BUG_ON(offsetof(struct timeval, tv_usec) !=
- offsetof(struct timespec, tv_nsec) ||
- sizeof(*tv) != sizeof(struct timespec));
- if (do_realtime((struct timespec *)tv) == VCLOCK_NONE)
+ if (do_realtime(&tmp) == VCLOCK_NONE)
return vdso_fallback_gtod(tv, tz);
+ tv->tv_sec = tmp.tv_sec;
+ tv->tv_usec = tmp.tv_nsec;
tv->tv_usec /= 1000;
}
if (unlikely(tz != NULL)) {
@@ -330,21 +397,21 @@ notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
return 0;
}
-int gettimeofday(struct timeval *, struct timezone *)
+int gettimeofday(struct api_timeval *, struct timezone *)
__attribute__((weak, alias("__vdso_gettimeofday")));
/*
* This will break when the xtime seconds get inaccurate, but that is
* unlikely
*/
-notrace time_t __vdso_time(time_t *t)
+notrace api_time_t __vdso_time(api_time_t *t)
{
/* This is atomic on x86 so we don't need any locks. */
- time_t result = ACCESS_ONCE(gtod->wall_time_sec);
+ api_time_t result = ACCESS_ONCE(gtod->wall_time_sec);
if (t)
*t = result;
return result;
}
-int time(time_t *t)
+int time(api_time_t *t)
__attribute__((weak, alias("__vdso_time")));
diff --git a/arch/x86/vdso/vdso32/vclock_gettime.c b/arch/x86/vdso/vdso32/vclock_gettime.c
index fab4ec6..b6df952 100644
--- a/arch/x86/vdso/vdso32/vclock_gettime.c
+++ b/arch/x86/vdso/vdso32/vclock_gettime.c
@@ -2,6 +2,8 @@
#ifdef CONFIG_X86_64
+#include <generated/asm/unistd_32_ia32.h>
+
#define _ASM_X86_PAGE_H
#define __pa(x) 0
@@ -10,6 +12,11 @@
#undef CONFIG_ILLEGAL_POINTER_VALUE
#define CONFIG_ILLEGAL_POINTER_VALUE 0
+#else
+
+#define __NR_ia32_clock_gettime __NR_clock_gettime
+#define __NR_ia32_gettimeofday __NR_gettimeofday
+
#endif
#include "../vclock_gettime.c"
--
1.8.5.3
--
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