1 files changed, 35 insertions, 0 deletions

diff --git a/arch/alpha/lib/dbg_stackkill.S b/arch/alpha/lib/dbg_stackkill.S
new file mode 100644
index 000000000000..e09f2ae1e09e
--- /dev/null
+++ b/arch/alpha/lib/dbg_stackkill.S
@@ -0,0 +1,35 @@
+/*
+ * arch/alpha/lib/killstack.S
+ * Contributed by Richard Henderson (rth@cygnus.com)
+ *
+ * Clobber the balance of the kernel stack, hoping to catch
+ * uninitialized local variables in the act.
+ */
+
+#include <asm/asm_offsets.h>
+
+        .text
+        .set noat
+
+        .align 5
+        .globl _mcount
+        .ent _mcount
+_mcount:
+        .frame $30, 0, $28, 0
+        .prologue 0
+
+        ldi     $0, 0xdeadbeef
+        lda     $2, -STACK_SIZE
+        sll     $0, 32, $1
+        and     $30, $2, $2
+        or      $0, $1, $0
+        lda     $2, TASK_SIZE($2)
+        cmpult  $2, $30, $1
+        beq     $1, 2f
+1:      stq     $0, 0($2)
+        addq    $2, 8, $2
+        cmpult  $2, $30, $1
+        bne     $1, 1b
+2:      ret     ($28)
+
+        .end _mcount