Initial commit: Go 1.23 release state

src/runtime/mem_aix.go

@@ -0,0 +1,81 @@
+// Copyright 2018 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.
+
+package runtime
+
+import (
+	"unsafe"
+)
+
+// Don't split the stack as this method may be invoked without a valid G, which
+// prevents us from allocating more stack.
+//
+//go:nosplit
+func sysAllocOS(n uintptr) unsafe.Pointer {
+	p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
+	if err != 0 {
+		if err == _EACCES {
+			print("runtime: mmap: access denied\n")
+			exit(2)
+		}
+		if err == _EAGAIN {
+			print("runtime: mmap: too much locked memory (check 'ulimit -l').\n")
+			exit(2)
+		}
+		return nil
+	}
+	return p
+}
+
+func sysUnusedOS(v unsafe.Pointer, n uintptr) {
+	madvise(v, n, _MADV_DONTNEED)
+}
+
+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)
+}
+
+func sysReserveOS(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
+}
+
+func sysMapOS(v unsafe.Pointer, n uintptr) {
+	// AIX does not allow mapping a range that is already mapped.
+	// So, call mprotect to change permissions.
+	// Note that sysMap is always called with a non-nil pointer
+	// since it transitions a Reserved memory region to Prepared,
+	// so mprotect is always possible.
+	_, err := mprotect(v, n, _PROT_READ|_PROT_WRITE)
+	if err == _ENOMEM {
+		throw("runtime: out of memory")
+	}
+	if err != 0 {
+		print("runtime: mprotect(", v, ", ", n, ") returned ", err, "\n")
+		throw("runtime: cannot map pages in arena address space")
+	}
+}