mirror of
https://github.com/golang/go
synced 2024-11-20 02:34:42 -07:00
4c2465d47d
This isn't C anymore. No binary change to pkg/linux_amd64/runtime.a. Change-Id: I24d66b0f5ac888f432b874aac684b1395e7c8345 Reviewed-on: https://go-review.googlesource.com/15903 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
// Copyright 2010 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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package runtime
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import "unsafe"
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// Don't split the stack as this function may be invoked without a valid G,
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// which prevents us from allocating more stack.
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//go:nosplit
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func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer {
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v := unsafe.Pointer(mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0))
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if uintptr(v) < 4096 {
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return nil
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}
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mSysStatInc(sysStat, n)
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return v
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}
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func sysUnused(v unsafe.Pointer, n uintptr) {
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// Linux's MADV_DONTNEED is like BSD's MADV_FREE.
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madvise(v, n, _MADV_FREE)
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}
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func sysUsed(v unsafe.Pointer, n uintptr) {
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}
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// Don't split the stack as this function may be invoked without a valid G,
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// which prevents us from allocating more stack.
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//go:nosplit
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func sysFree(v unsafe.Pointer, n uintptr, sysStat *uint64) {
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mSysStatDec(sysStat, n)
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munmap(v, n)
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}
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func sysFault(v unsafe.Pointer, n uintptr) {
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mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
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}
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func sysReserve(v unsafe.Pointer, n uintptr, reserved *bool) unsafe.Pointer {
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*reserved = true
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p := unsafe.Pointer(mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0))
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if uintptr(p) < 4096 {
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return nil
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}
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return p
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}
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const (
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_ENOMEM = 12
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)
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func sysMap(v unsafe.Pointer, n uintptr, reserved bool, sysStat *uint64) {
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mSysStatInc(sysStat, n)
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p := unsafe.Pointer(mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0))
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if uintptr(p) == _ENOMEM {
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throw("runtime: out of memory")
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}
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if p != v {
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throw("runtime: cannot map pages in arena address space")
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}
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}
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