// 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 method may be invoked without a valid G, which
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// 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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p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANONYMOUS|_MAP_PRIVATE, -1, 0)
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if err != 0 {
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if err == _EACCES {
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print("runtime: mmap: access denied\n")
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exit(2)
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}
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if err == _EAGAIN {
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print("runtime: mmap: too much locked memory (check 'ulimit -l').\n")
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exit(2)
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}
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//println("sysAlloc failed: ", err)
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return nil
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}
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mSysStatInc(sysStat, n)
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return p
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}
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func sysUnused(v unsafe.Pointer, n uintptr) {
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madvise(v, n, _MADV_DONTNEED)
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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_ANONYMOUS|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
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}
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func sysReserve(v unsafe.Pointer, n uintptr) unsafe.Pointer {
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p, err := mmap(v, n, _PROT_NONE, _MAP_ANONYMOUS|_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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func sysMap(v unsafe.Pointer, n uintptr, sysStat *uint64) {
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mSysStatInc(sysStat, n)
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// AIX does not allow mapping a range that is already mapped.
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// So always unmap first even if it is already unmapped.
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munmap(v, n)
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p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANONYMOUS|_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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throw("runtime: cannot map pages in arena address space")
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}
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}
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