| // Copyright 2010 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build darwin dragonfly freebsd nacl netbsd openbsd solaris |
| |
| package runtime |
| |
| import ( |
| "unsafe" |
| ) |
| |
| // Don't split the stack as this function may be invoked without a valid G, |
| // which prevents us from allocating more stack. |
| //go:nosplit |
| func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer { |
| v, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0) |
| if err != 0 { |
| return nil |
| } |
| mSysStatInc(sysStat, n) |
| return v |
| } |
| |
| func sysUnused(v unsafe.Pointer, n uintptr) { |
| madvise(v, n, _MADV_FREE) |
| } |
| |
| func sysUsed(v unsafe.Pointer, n uintptr) { |
| } |
| |
| // Don't split the stack as this function may be invoked without a valid G, |
| // which prevents us from allocating more stack. |
| //go:nosplit |
| func sysFree(v unsafe.Pointer, n uintptr, sysStat *uint64) { |
| mSysStatDec(sysStat, n) |
| munmap(v, n) |
| } |
| |
| func sysFault(v unsafe.Pointer, n uintptr) { |
| mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0) |
| } |
| |
| func sysReserve(v unsafe.Pointer, n uintptr) unsafe.Pointer { |
| p, err := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0) |
| if err != 0 { |
| return nil |
| } |
| return p |
| } |
| |
| const _sunosEAGAIN = 11 |
| const _ENOMEM = 12 |
| |
| func sysMap(v unsafe.Pointer, n uintptr, sysStat *uint64) { |
| mSysStatInc(sysStat, n) |
| |
| p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0) |
| if err == _ENOMEM || (GOOS == "solaris" && err == _sunosEAGAIN) { |
| throw("runtime: out of memory") |
| } |
| if p != v || err != 0 { |
| throw("runtime: cannot map pages in arena address space") |
| } |
| } |