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42 lines
1.5 KiB
Go
42 lines
1.5 KiB
Go
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Support for memory sanitizer. See runtime/cgo/mmap.go.
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// +build linux,amd64
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package runtime
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import "unsafe"
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// _cgo_mmap is filled in by runtime/cgo when it is linked into the
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// program, so it is only non-nil when using cgo.
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//go:linkname _cgo_mmap _cgo_mmap
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var _cgo_mmap unsafe.Pointer
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func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) unsafe.Pointer {
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if _cgo_mmap != nil {
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// Make ret a uintptr so that writing to it in the
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// function literal does not trigger a write barrier.
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// A write barrier here could break because of the way
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// that mmap uses the same value both as a pointer and
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// an errno value.
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// TODO: Fix mmap to return two values.
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var ret uintptr
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systemstack(func() {
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ret = callCgoMmap(addr, n, prot, flags, fd, off)
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})
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return unsafe.Pointer(ret)
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}
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return sysMmap(addr, n, prot, flags, fd, off)
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}
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// sysMmap calls the mmap system call. It is implemented in assembly.
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func sysMmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) unsafe.Pointer
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// cgoMmap calls the mmap function in the runtime/cgo package on the
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// callCgoMmap calls the mmap function in the runtime/cgo package
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// using the GCC calling convention. It is implemented in assembly.
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func callCgoMmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) uintptr
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