// 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. //go:build dragonfly || freebsd || 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 sysAllocOS(n uintptr) unsafe.Pointer { v, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0) if err != 0 { return nil } return v } func sysUnusedOS(v unsafe.Pointer, n uintptr) { if debug.madvdontneed != 0 { madvise(v, n, _MADV_DONTNEED) } else { madvise(v, n, _MADV_FREE) } } func sysUsedOS(v unsafe.Pointer, n uintptr) { } func sysHugePageOS(v unsafe.Pointer, n uintptr) { } func sysNoHugePageOS(v unsafe.Pointer, n uintptr) { } func sysHugePageCollapseOS(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 sysFreeOS(v unsafe.Pointer, n uintptr) { munmap(v, n) } func sysFaultOS(v unsafe.Pointer, n uintptr) { mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0) } // Indicates not to reserve swap space for the mapping. const _sunosMAP_NORESERVE = 0x40 func sysReserveOS(v unsafe.Pointer, n uintptr) unsafe.Pointer { flags := int32(_MAP_ANON | _MAP_PRIVATE) if GOOS == "solaris" || GOOS == "illumos" { // Be explicit that we don't want to reserve swap space // for PROT_NONE anonymous mappings. This avoids an issue // wherein large mappings can cause fork to fail. flags |= _sunosMAP_NORESERVE } p, err := mmap(v, n, _PROT_NONE, flags, -1, 0) if err != 0 { return nil } return p } const _sunosEAGAIN = 11 const _ENOMEM = 12 func sysMapOS(v unsafe.Pointer, n uintptr) { p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0) if err == _ENOMEM || ((GOOS == "solaris" || GOOS == "illumos") && err == _sunosEAGAIN) { throw("runtime: out of memory") } if p != v || err != 0 { print("runtime: mmap(", v, ", ", n, ") returned ", p, ", ", err, "\n") throw("runtime: cannot map pages in arena address space") } }