1 files changed, 40 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..88b4990
--- /dev/null
+++ b/src/cmd/internal/objabi/stack.go
@@ -0,0 +1,40 @@
+// 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
+
+import "internal/buildcfg"
+
+// For the linkers. Must match Go definitions.
+
+const (
+	STACKSYSTEM = 0
+	StackSystem = STACKSYSTEM
+	StackBig    = 4096
+	StackSmall  = 128
+)
+
+func StackLimit(race bool) int {
+	// This arithmetic must match that in runtime/stack.go:{_StackGuard,_StackLimit}.
+	stackGuard := 928*stackGuardMultiplier(race) + StackSystem
+	stackLimit := stackGuard - StackSystem - StackSmall
+	return stackLimit
+}
+
+// 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(race bool) int {
+	// This arithmetic must match that in runtime/internal/sys/consts.go:StackGuardMultiplier.
+	n := 1
+	// On AIX, a larger stack is needed for syscalls.
+	if buildcfg.GOOS == "aix" {
+		n += 1
+	}
+	// The race build also needs more stack.
+	if race {
+		n += 1
+	}
+	return n
+}