switch from assembly stubs to go:linkname comment
The go:linkname way works with Go 1.17 (with regabi), too.
Upstream did this in 2015 in
0b8d583320
See also https://sitano.github.io/2016/04/28/golang-private/ for more background
about both techniques.
geesefs-0-30-9
parent
8edaf5989f
commit
0630024b2b
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@ -70,7 +70,7 @@ func (m *OutMessage) OutHeader() *fusekernel.OutHeader {
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func (m *OutMessage) Grow(n int) unsafe.Pointer {
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func (m *OutMessage) Grow(n int) unsafe.Pointer {
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p := m.GrowNoZero(n)
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p := m.GrowNoZero(n)
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if p != nil {
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if p != nil {
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memclr(p, uintptr(n))
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jacobsa_fuse_memclr(p, uintptr(n))
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}
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}
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return p
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return p
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@ -113,7 +113,7 @@ func (m *OutMessage) Append(src []byte) {
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}
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}
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&src))
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&src))
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memmove(p, unsafe.Pointer(sh.Data), uintptr(sh.Len))
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jacobsa_fuse_memmove(p, unsafe.Pointer(sh.Data), uintptr(sh.Len))
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return
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return
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}
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}
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@ -126,7 +126,7 @@ func (m *OutMessage) AppendString(src string) {
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}
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}
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sh := (*reflect.StringHeader)(unsafe.Pointer(&src))
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sh := (*reflect.StringHeader)(unsafe.Pointer(&src))
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memmove(p, unsafe.Pointer(sh.Data), uintptr(sh.Len))
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jacobsa_fuse_memmove(p, unsafe.Pointer(sh.Data), uintptr(sh.Len))
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return
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return
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}
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}
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@ -80,7 +80,7 @@ func TestMemclr(t *testing.T) {
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p = unsafe.Pointer(&b[0])
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p = unsafe.Pointer(&b[0])
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}
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}
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memclr(p, uintptr(len(b)))
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jacobsa_fuse_memclr(p, uintptr(len(b)))
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// Check
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// Check
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if i := findNonZero(p, len(b)); i != len(b) {
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if i := findNonZero(p, len(b)); i != len(b) {
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@ -21,9 +21,11 @@ import "unsafe"
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// Zero the n bytes starting at p.
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// Zero the n bytes starting at p.
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//
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//
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// REQUIRES: the region does not contain any Go pointers.
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// REQUIRES: the region does not contain any Go pointers.
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func memclr(p unsafe.Pointer, n uintptr)
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//go:linkname jacobsa_fuse_memclr runtime.memclrNoHeapPointers
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func jacobsa_fuse_memclr(p unsafe.Pointer, n uintptr)
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//go:noescape
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//go:noescape
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// Copy from src to dst, allowing overlap.
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// Copy from src to dst, allowing overlap.
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func memmove(dst unsafe.Pointer, src unsafe.Pointer, n uintptr)
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//go:linkname jacobsa_fuse_memmove runtime.memmove
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func jacobsa_fuse_memmove(dst unsafe.Pointer, src unsafe.Pointer, n uintptr)
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@ -1,40 +0,0 @@
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build amd64 arm64 ppc64 ppc64le arm
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// +build go1.8
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// Assembly code isn't subject to visibility restrictions, so we can jump
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// directly into package runtime.
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//
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// Technique copied from here:
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// https://github.com/golang/go/blob/d8c6dac/src/os/signal/sig.s
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#include "textflag.h"
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#ifdef GOARCH_arm
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#define JMP B
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#endif
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#ifdef GOARCH_ppc64
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#define JMP BR
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#endif
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#ifdef GOARCH_ppc64le
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#define JMP BR
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#endif
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TEXT ·memclr(SB),NOSPLIT,$0-16
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JMP runtime·memclrNoHeapPointers(SB)
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TEXT ·memmove(SB),NOSPLIT,$0-24
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JMP runtime·memmove(SB)
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@ -12,29 +12,7 @@
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// See the License for the specific language governing permissions and
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// limitations under the License.
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// +build amd64 arm64 ppc64 ppc64le arm
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// The buffer package uses //go:linkname to push a few functions into this
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// +build !go1.8
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// package but we still need a .s file so the Go tool does not pass -complete
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// to the go tool compile so the latter does not complain about Go functions
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// Assembly code isn't subject to visibility restrictions, so we can jump
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// with no bodies.
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// directly into package runtime.
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//
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// Technique copied from here:
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// https://github.com/golang/go/blob/d8c6dac/src/os/signal/sig.s
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#include "textflag.h"
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#ifdef GOARCH_arm
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#define JMP B
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#endif
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#ifdef GOARCH_ppc64
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#define JMP BR
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#endif
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#ifdef GOARCH_ppc64le
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#define JMP BR
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#endif
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TEXT ·memclr(SB),NOSPLIT,$0-16
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JMP runtime·memclr(SB)
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TEXT ·memmove(SB),NOSPLIT,$0-24
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JMP runtime·memmove(SB)
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Loading…
Reference in New Issue