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runtime: use vDSO clock_gettime on linux/mips64x #35181

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runtime: use vDSO clock_gettime on linux/mips64x #35181

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2 changes: 1 addition & 1 deletion src/runtime/os_linux_novdso.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
// license that can be found in the LICENSE file.

// +build linux
// +build !386,!amd64,!arm,!arm64,!ppc64,!ppc64le
// +build !386,!amd64,!arm,!arm64,!mips64,!mips64le,!ppc64,!ppc64le

package runtime

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78 changes: 74 additions & 4 deletions src/runtime/sys_linux_mips64x.s
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Expand Up @@ -211,23 +211,88 @@ TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28

// func walltime1() (sec int64, nsec int32)
TEXT runtime·walltime1(SB),NOSPLIT,$16
MOVV R29, R16 // R16 is unchanged by C code
MOVV R29, R1

MOVV g_m(g), R17 // R17 = m

// Set vdsoPC and vdsoSP for SIGPROF traceback.
MOVV R31, m_vdsoPC(R17)
MOVV R29, m_vdsoSP(R17)

MOVV m_curg(R17), R4
MOVV g, R5
BNE R4, R5, noswitch

MOVV m_g0(R17), R4
MOVV (g_sched+gobuf_sp)(R4), R1 // Set SP to g0 stack

noswitch:
SUBV $16, R1
AND $~15, R1 // Align for C code
MOVV R1, R29

MOVW $0, R4 // CLOCK_REALTIME
MOVV $0(R29), R5
MOVV $SYS_clock_gettime, R2
SYSCALL

MOVV runtime·vdsoClockgettimeSym(SB), R25
BEQ R25, fallback

JAL (R25)

finish:
MOVV 0(R29), R3 // sec
MOVV 8(R29), R5 // nsec

MOVV R16, R29 // restore SP
MOVV R0, m_vdsoSP(R17) // clear vdsoSP

MOVV R3, sec+0(FP)
MOVW R5, nsec+8(FP)
RET

fallback:
MOVV $SYS_clock_gettime, R2
SYSCALL
JMP finish

TEXT runtime·nanotime1(SB),NOSPLIT,$16
MOVV R29, R16 // R16 is unchanged by C code
MOVV R29, R1

MOVV g_m(g), R17 // R17 = m

// Set vdsoPC and vdsoSP for SIGPROF traceback.
MOVV R31, m_vdsoPC(R17)
MOVV R29, m_vdsoSP(R17)

MOVV m_curg(R17), R4
MOVV g, R5
BNE R4, R5, noswitch

MOVV m_g0(R17), R4
MOVV (g_sched+gobuf_sp)(R4), R1 // Set SP to g0 stack

noswitch:
SUBV $16, R1
AND $~15, R1 // Align for C code
MOVV R1, R29

MOVW $1, R4 // CLOCK_MONOTONIC
MOVV $0(R29), R5
MOVV $SYS_clock_gettime, R2
SYSCALL

MOVV runtime·vdsoClockgettimeSym(SB), R25
BEQ R25, fallback

JAL (R25)

finish:
MOVV 0(R29), R3 // sec
MOVV 8(R29), R5 // nsec

MOVV R16, R29 // restore SP
MOVV R0, m_vdsoSP(R17) // clear vdsoSP

// sec is in R3, nsec in R5
// return nsec in R3
MOVV $1000000000, R4
Expand All @@ -237,6 +302,11 @@ TEXT runtime·nanotime1(SB),NOSPLIT,$16
MOVV R3, ret+0(FP)
RET

fallback:
MOVV $SYS_clock_gettime, R2
SYSCALL
JMP finish

TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW how+0(FP), R4
MOVV new+8(FP), R5
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2 changes: 1 addition & 1 deletion src/runtime/vdso_elf64.go
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Expand Up @@ -3,7 +3,7 @@
// license that can be found in the LICENSE file.

// +build linux
// +build amd64 arm64 ppc64 ppc64le
// +build amd64 arm64 mips64 mips64le ppc64 ppc64le

package runtime

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2 changes: 1 addition & 1 deletion src/runtime/vdso_in_none.go
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Expand Up @@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build linux,!386,!amd64,!arm,!arm64,!ppc64,!ppc64le !linux
// +build linux,!386,!amd64,!arm,!arm64,!mips64,!mips64le,!ppc64,!ppc64le !linux

package runtime

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2 changes: 1 addition & 1 deletion src/runtime/vdso_linux.go
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Expand Up @@ -3,7 +3,7 @@
// license that can be found in the LICENSE file.

// +build linux
// +build 386 amd64 arm arm64 ppc64 ppc64le
// +build 386 amd64 arm arm64 mips64 mips64le ppc64 ppc64le

package runtime

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28 changes: 28 additions & 0 deletions src/runtime/vdso_linux_mips64x.go
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@@ -0,0 +1,28 @@
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build linux
// +build mips64 mips64le

package runtime

const (
// vdsoArrayMax is the byte-size of a maximally sized array on this architecture.
// See cmd/compile/internal/mips64/galign.go arch.MAXWIDTH initialization.
vdsoArrayMax = 1<<50 - 1
)

// see man 7 vdso : mips
var vdsoLinuxVersion = vdsoVersionKey{"LINUX_2.6", 0x3ae75f6}

// The symbol name is not __kernel_clock_gettime as suggested by the manpage;
// according to Linux source code it should be __vdso_clock_gettime instead.
var vdsoSymbolKeys = []vdsoSymbolKey{
{"__vdso_clock_gettime", 0xd35ec75, 0x6e43a318, &vdsoClockgettimeSym},
}

// initialize to fall back to syscall
var (
vdsoClockgettimeSym uintptr = 0
)