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vsyscall.h 0000644 00000000315 14722071324 0006556 0 ustar 00 /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __VDSO_VSYSCALL_H #define __VDSO_VSYSCALL_H #ifndef __ASSEMBLY__ #include <asm/vdso/vsyscall.h> #endif /* !__ASSEMBLY__ */ #endif /* __VDSO_VSYSCALL_H */ datapage.h 0000644 00000004554 14722071324 0006475 0 ustar 00 /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __VDSO_DATAPAGE_H #define __VDSO_DATAPAGE_H #ifndef __ASSEMBLY__ #include <linux/bits.h> #include <linux/time.h> #include <linux/types.h> #define VDSO_BASES (CLOCK_TAI + 1) #define VDSO_HRES (BIT(CLOCK_REALTIME) | \ BIT(CLOCK_MONOTONIC) | \ BIT(CLOCK_BOOTTIME) | \ BIT(CLOCK_TAI)) #define VDSO_COARSE (BIT(CLOCK_REALTIME_COARSE) | \ BIT(CLOCK_MONOTONIC_COARSE)) #define VDSO_RAW (BIT(CLOCK_MONOTONIC_RAW)) #define CS_HRES_COARSE 0 #define CS_RAW 1 #define CS_BASES (CS_RAW + 1) /** * struct vdso_timestamp - basetime per clock_id * @sec: seconds * @nsec: nanoseconds * * There is one vdso_timestamp object in vvar for each vDSO-accelerated * clock_id. For high-resolution clocks, this encodes the time * corresponding to vdso_data.cycle_last. For coarse clocks this encodes * the actual time. * * To be noticed that for highres clocks nsec is left-shifted by * vdso_data.cs[x].shift. */ struct vdso_timestamp { u64 sec; u64 nsec; }; /** * struct vdso_data - vdso datapage representation * @seq: timebase sequence counter * @clock_mode: clock mode * @cycle_last: timebase at clocksource init * @mask: clocksource mask * @mult: clocksource multiplier * @shift: clocksource shift * @basetime[clock_id]: basetime per clock_id * @tz_minuteswest: minutes west of Greenwich * @tz_dsttime: type of DST correction * @hrtimer_res: hrtimer resolution * @__unused: unused * * vdso_data will be accessed by 64 bit and compat code at the same time * so we should be careful before modifying this structure. */ struct vdso_data { u32 seq; s32 clock_mode; u64 cycle_last; u64 mask; u32 mult; u32 shift; struct vdso_timestamp basetime[VDSO_BASES]; s32 tz_minuteswest; s32 tz_dsttime; u32 hrtimer_res; u32 __unused; }; /* * We use the hidden visibility to prevent the compiler from generating a GOT * relocation. Not only is going through a GOT useless (the entry couldn't and * must not be overridden by another library), it does not even work: the linker * cannot generate an absolute address to the data page. * * With the hidden visibility, the compiler simply generates a PC-relative * relocation, and this is what we need. */ extern struct vdso_data _vdso_data[CS_BASES] __attribute__((visibility("hidden"))); #endif /* !__ASSEMBLY__ */ #endif /* __VDSO_DATAPAGE_H */ helpers.h 0000644 00000002411 14722071324 0006357 0 ustar 00 /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __VDSO_HELPERS_H #define __VDSO_HELPERS_H #ifndef __ASSEMBLY__ #include <vdso/datapage.h> static __always_inline u32 vdso_read_begin(const struct vdso_data *vd) { u32 seq; while ((seq = READ_ONCE(vd->seq)) & 1) cpu_relax(); smp_rmb(); return seq; } static __always_inline u32 vdso_read_retry(const struct vdso_data *vd, u32 start) { u32 seq; smp_rmb(); seq = READ_ONCE(vd->seq); return seq != start; } static __always_inline void vdso_write_begin(struct vdso_data *vd) { /* * WRITE_ONCE it is required otherwise the compiler can validly tear * updates to vd[x].seq and it is possible that the value seen by the * reader it is inconsistent. */ WRITE_ONCE(vd[CS_HRES_COARSE].seq, vd[CS_HRES_COARSE].seq + 1); WRITE_ONCE(vd[CS_RAW].seq, vd[CS_RAW].seq + 1); smp_wmb(); } static __always_inline void vdso_write_end(struct vdso_data *vd) { smp_wmb(); /* * WRITE_ONCE it is required otherwise the compiler can validly tear * updates to vd[x].seq and it is possible that the value seen by the * reader it is inconsistent. */ WRITE_ONCE(vd[CS_HRES_COARSE].seq, vd[CS_HRES_COARSE].seq + 1); WRITE_ONCE(vd[CS_RAW].seq, vd[CS_RAW].seq + 1); } #endif /* !__ASSEMBLY__ */ #endif /* __VDSO_HELPERS_H */ Kconfig 0000644 00000001057 14722071471 0006057 0 ustar 00 # SPDX-License-Identifier: GPL-2.0 config HAVE_GENERIC_VDSO bool if HAVE_GENERIC_VDSO config GENERIC_GETTIMEOFDAY bool help This is a generic implementation of gettimeofday vdso. Each architecture that enables this feature has to provide the fallback implementation. config GENERIC_VDSO_32 bool depends on GENERIC_GETTIMEOFDAY && !64BIT help This config option helps to avoid possible performance issues in 32 bit only architectures. config GENERIC_COMPAT_VDSO bool help This config option enables the compat VDSO layer. endif Makefile 0000644 00000001574 14722071471 0006220 0 ustar 00 # SPDX-License-Identifier: GPL-2.0 GENERIC_VDSO_MK_PATH := $(abspath $(lastword $(MAKEFILE_LIST))) GENERIC_VDSO_DIR := $(dir $(GENERIC_VDSO_MK_PATH)) c-gettimeofday-$(CONFIG_GENERIC_GETTIMEOFDAY) := $(addprefix $(GENERIC_VDSO_DIR), gettimeofday.c) # This cmd checks that the vdso library does not contain absolute relocation # It has to be called after the linking of the vdso library and requires it # as a parameter. # # $(ARCH_REL_TYPE_ABS) is defined in the arch specific makefile and corresponds # to the absolute relocation types printed by "objdump -R" and accepted by the # dynamic linker. ifndef ARCH_REL_TYPE_ABS $(error ARCH_REL_TYPE_ABS is not set) endif quiet_cmd_vdso_check = VDSOCHK $@ cmd_vdso_check = if $(OBJDUMP) -R $@ | grep -E -h "$(ARCH_REL_TYPE_ABS)"; \ then (echo >&2 "$@: dynamic relocations are not supported"; \ rm -f $@; /bin/false); fi
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