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")
+	}
+}