aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/vdso/vclock_gettime.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/vdso/vclock_gettime.c')
-rw-r--r--arch/sparc/vdso/vclock_gettime.c102
1 files changed, 46 insertions, 56 deletions
diff --git a/arch/sparc/vdso/vclock_gettime.c b/arch/sparc/vdso/vclock_gettime.c
index 75dca9aab737..7b539ceebe13 100644
--- a/arch/sparc/vdso/vclock_gettime.c
+++ b/arch/sparc/vdso/vclock_gettime.c
@@ -12,11 +12,6 @@
* Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
*/
-/* Disable profiling for userspace code: */
-#ifndef DISABLE_BRANCH_PROFILING
-#define DISABLE_BRANCH_PROFILING
-#endif
-
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/string.h>
@@ -26,13 +21,6 @@
#include <asm/clocksource.h>
#include <asm/vvar.h>
-#undef TICK_PRIV_BIT
-#ifdef CONFIG_SPARC64
-#define TICK_PRIV_BIT (1UL << 63)
-#else
-#define TICK_PRIV_BIT (1ULL << 63)
-#endif
-
#ifdef CONFIG_SPARC64
#define SYSCALL_STRING \
"ta 0x6d;" \
@@ -60,24 +48,22 @@
* Compute the vvar page's address in the process address space, and return it
* as a pointer to the vvar_data.
*/
-static notrace noinline struct vvar_data *
-get_vvar_data(void)
+notrace static __always_inline struct vvar_data *get_vvar_data(void)
{
unsigned long ret;
/*
- * vdso data page is the first vDSO page so grab the return address
+ * vdso data page is the first vDSO page so grab the PC
* and move up a page to get to the data page.
*/
- ret = (unsigned long)__builtin_return_address(0);
+ __asm__("rd %%pc, %0" : "=r" (ret));
ret &= ~(8192 - 1);
ret -= 8192;
return (struct vvar_data *) ret;
}
-static notrace long
-vdso_fallback_gettime(long clock, struct timespec *ts)
+notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
{
register long num __asm__("g1") = __NR_clock_gettime;
register long o0 __asm__("o0") = clock;
@@ -88,8 +74,7 @@ vdso_fallback_gettime(long clock, struct timespec *ts)
return o0;
}
-static notrace __always_inline long
-vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
+notrace static long vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
{
register long num __asm__("g1") = __NR_gettimeofday;
register long o0 __asm__("o0") = (long) tv;
@@ -101,38 +86,43 @@ vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
}
#ifdef CONFIG_SPARC64
-static notrace noinline u64
-vread_tick(void) {
+notrace static __always_inline u64 vread_tick(void)
+{
u64 ret;
- __asm__ __volatile__("rd %%asr24, %0 \n"
- ".section .vread_tick_patch, \"ax\" \n"
- "rd %%tick, %0 \n"
- ".previous \n"
- : "=&r" (ret));
- return ret & ~TICK_PRIV_BIT;
+ __asm__ __volatile__("1:\n\t"
+ "rd %%tick, %0\n\t"
+ ".pushsection .tick_patch, \"a\"\n\t"
+ ".word 1b - ., 1f - .\n\t"
+ ".popsection\n\t"
+ ".pushsection .tick_patch_replacement, \"ax\"\n\t"
+ "1:\n\t"
+ "rd %%asr24, %0\n\t"
+ ".popsection\n"
+ : "=r" (ret));
+ return ret;
}
#else
-static notrace noinline u64
-vread_tick(void)
+notrace static __always_inline u64 vread_tick(void)
{
- unsigned int lo, hi;
-
- __asm__ __volatile__("rd %%asr24, %%g1\n\t"
- "srlx %%g1, 32, %1\n\t"
- "srl %%g1, 0, %0\n"
- ".section .vread_tick_patch, \"ax\" \n"
- "rd %%tick, %%g1\n"
- ".previous \n"
- : "=&r" (lo), "=&r" (hi)
- :
- : "g1");
- return lo | ((u64)hi << 32);
+ register unsigned long long ret asm("o4");
+
+ __asm__ __volatile__("1:\n\t"
+ "rd %%tick, %L0\n\t"
+ "srlx %L0, 32, %H0\n\t"
+ ".pushsection .tick_patch, \"a\"\n\t"
+ ".word 1b - ., 1f - .\n\t"
+ ".popsection\n\t"
+ ".pushsection .tick_patch_replacement, \"ax\"\n\t"
+ "1:\n\t"
+ "rd %%asr24, %L0\n\t"
+ ".popsection\n"
+ : "=r" (ret));
+ return ret;
}
#endif
-static notrace inline u64
-vgetsns(struct vvar_data *vvar)
+notrace static __always_inline u64 vgetsns(struct vvar_data *vvar)
{
u64 v;
u64 cycles;
@@ -142,13 +132,12 @@ vgetsns(struct vvar_data *vvar)
return v * vvar->clock.mult;
}
-static notrace noinline int
-do_realtime(struct vvar_data *vvar, struct timespec *ts)
+notrace static __always_inline int do_realtime(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;
u64 ns;
- ts->tv_nsec = 0;
do {
seq = vvar_read_begin(vvar);
ts->tv_sec = vvar->wall_time_sec;
@@ -157,18 +146,18 @@ do_realtime(struct vvar_data *vvar, struct timespec *ts)
ns >>= vvar->clock.shift;
} while (unlikely(vvar_read_retry(vvar, seq)));
- timespec_add_ns(ts, ns);
+ ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
+ ts->tv_nsec = ns;
return 0;
}
-static notrace noinline int
-do_monotonic(struct vvar_data *vvar, struct timespec *ts)
+notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;
u64 ns;
- ts->tv_nsec = 0;
do {
seq = vvar_read_begin(vvar);
ts->tv_sec = vvar->monotonic_time_sec;
@@ -177,13 +166,14 @@ do_monotonic(struct vvar_data *vvar, struct timespec *ts)
ns >>= vvar->clock.shift;
} while (unlikely(vvar_read_retry(vvar, seq)));
- timespec_add_ns(ts, ns);
+ ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
+ ts->tv_nsec = ns;
return 0;
}
-static notrace noinline int
-do_realtime_coarse(struct vvar_data *vvar, struct timespec *ts)
+notrace static int do_realtime_coarse(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;
@@ -195,8 +185,8 @@ do_realtime_coarse(struct vvar_data *vvar, struct timespec *ts)
return 0;
}
-static notrace noinline int
-do_monotonic_coarse(struct vvar_data *vvar, struct timespec *ts)
+notrace static int do_monotonic_coarse(struct vvar_data *vvar,
+ struct timespec *ts)
{
unsigned long seq;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.