1 files changed, 27 insertions, 0 deletions

diff --git a/arch/alpha/lib/dbg_stackcheck.S b/arch/alpha/lib/dbg_stackcheck.S
new file mode 100644
index 000000000000..cc5ce3a5fcad
--- /dev/null
+++ b/arch/alpha/lib/dbg_stackcheck.S
@@ -0,0 +1,27 @@
+/*
+ * arch/alpha/lib/stackcheck.S
+ * Contributed by Richard Henderson (rth@tamu.edu)
+ *
+ * Verify that we have not overflowed the stack.  Oops if we have.
+ */
+
+#include <asm/asm_offsets.h>
+
+        .text
+        .set noat
+
+        .align 3
+        .globl _mcount
+        .ent _mcount
+_mcount:
+        .frame $30, 0, $28, 0
+        .prologue 0
+
+        lda     $0, TASK_SIZE($8)
+        cmpult  $30, $0, $0
+        bne     $0, 1f
+        ret     ($28)
+1:      stq     $31, -8($31)    # oops me, damn it.
+        br      1b
+
+        .end _mcount