diff options
Diffstat (limited to 'src/runtime/mem_bsd.go')
-rw-r--r-- | src/runtime/mem_bsd.go | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/runtime/mem_bsd.go b/src/runtime/mem_bsd.go new file mode 100644 index 0000000..6c5edb1 --- /dev/null +++ b/src/runtime/mem_bsd.go @@ -0,0 +1,81 @@ +// 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) { +} + +// 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") + } +} |