initial commit

1 files changed, 44 insertions, 0 deletions

diff --git a/openssl/bugs/ultrixcc.c b/openssl/bugs/ultrixcc.c
new file mode 100644
index 0000000..6e24549
--- /dev/null
+++ b/openssl/bugs/ultrixcc.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+
+/*-
+ * This is a cc optimiser bug for ultrix 4.3, mips CPU.
+ * What happens is that the compiler, due to the (a)&7,
+ * does
+ * i=a&7;
+ * i--;
+ * i*=4;
+ * Then uses i as the offset into a jump table.
+ * The problem is that a value of 0 generates an offset of
+ * 0xfffffffc.
+ */
+
+main()
+{
+    f(5);
+    f(0);
+}
+
+int f(a)
+int a;
+{
+    switch (a & 7) {
+    case 7:
+        printf("7\n");
+    case 6:
+        printf("6\n");
+    case 5:
+        printf("5\n");
+    case 4:
+        printf("4\n");
+    case 3:
+        printf("3\n");
+    case 2:
+        printf("2\n");
+    case 1:
+        printf("1\n");
+#ifdef FIX_BUG
+    case 0:
+        ;
+#endif
+    }
+}