mirror of https://go.googlesource.com/go
77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
// Copyright 2018 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 (
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"unsafe"
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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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//
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//go:nosplit
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func sysAllocOS(n uintptr) unsafe.Pointer {
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v, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
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if err != 0 {
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return nil
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}
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return v
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}
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func sysUnusedOS(v unsafe.Pointer, n uintptr) {
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// MADV_FREE_REUSABLE is like MADV_FREE except it also propagates
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// accounting information about the process to task_info.
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madvise(v, n, _MADV_FREE_REUSABLE)
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}
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func sysUsedOS(v unsafe.Pointer, n uintptr) {
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// MADV_FREE_REUSE is necessary to keep the kernel's accounting
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// accurate. If called on any memory region that hasn't been
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// MADV_FREE_REUSABLE'd, it's a no-op.
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madvise(v, n, _MADV_FREE_REUSE)
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}
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func sysHugePageOS(v unsafe.Pointer, n uintptr) {
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}
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func sysNoHugePageOS(v unsafe.Pointer, n uintptr) {
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}
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func sysHugePageCollapseOS(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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//
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//go:nosplit
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func sysFreeOS(v unsafe.Pointer, n uintptr) {
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munmap(v, n)
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}
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func sysFaultOS(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 sysReserveOS(v unsafe.Pointer, n uintptr) unsafe.Pointer {
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p, err := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
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if err != 0 {
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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 _ENOMEM = 12
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func sysMapOS(v unsafe.Pointer, n uintptr) {
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p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
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if err == _ENOMEM {
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throw("runtime: out of memory")
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}
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if p != v || err != 0 {
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print("runtime: mmap(", v, ", ", n, ") returned ", p, ", ", err, "\n")
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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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