1 files changed, 33 insertions, 0 deletions
diff --git a/src/cmd/internal/objabi/stack.go b/src/cmd/internal/objabi/stack.go
new file mode 100644
index 0000000..05a1d4a
--- /dev/null
+++ b/src/cmd/internal/objabi/stack.go
@@ -0,0 +1,33 @@
+// Copyright 2011 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 objabi
+
+// For the linkers. Must match Go definitions.
+
+const (
+	STACKSYSTEM = 0
+	StackSystem = STACKSYSTEM
+	StackBig    = 4096
+	StackSmall  = 128
+)
+
+const (
+	StackPreempt = -1314 // 0xfff...fade
+)
+
+// Initialize StackGuard and StackLimit according to target system.
+var StackGuard = 928*stackGuardMultiplier() + StackSystem
+var StackLimit = StackGuard - StackSystem - StackSmall
+
+// stackGuardMultiplier returns a multiplier to apply to the default
+// stack guard size. Larger multipliers are used for non-optimized
+// builds that have larger stack frames or for specific targets.
+func stackGuardMultiplier() int {
+	// On AIX, a larger stack is needed for syscalls.
+	if GOOS == "aix" {
+		return 2
+	}
+	return stackGuardMultiplierDefault
+}