x86: Add a -mstack-protector-guard=global test

Verify that -mstack-protector-guard=global works on x86.  Default stack
protector uses TLS.  -mstack-protector-guard=global uses a global variable,
__stack_chk_guard, instead of TLS.

	* gcc.target/i386/ssp-global.c: New file.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

diff --git a/gcc/testsuite/gcc.target/i386/ssp-global.c b/gcc/testsuite/gcc.target/i386/ssp-global.c
new file mode 100644 (file)
index 0000000..85a288c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/ssp-global.c
@@ -0,0 +1,35 @@
+/* { dg-do run { target fstack_protector } } */
+/* { dg-options "-O2 -fstack-protector-all -mstack-protector-guard=global" } */
+
+#include <stdlib.h>
+
+#ifdef __LP64__
+const unsigned long int __stack_chk_guard = 0x2d853605a4d9a09cUL;
+#else
+const unsigned long int __stack_chk_guard = 0xdd2cc927UL;
+#endif
+
+void
+__stack_chk_fail (void)
+{
+  exit (0); /* pass */
+}
+
+__attribute__ ((noipa))
+void
+smash (char *p, int i)
+{
+  p[i] = 42;
+}
+
+int
+main (void)
+{
+  char foo[255];
+
+   /* smash stack */
+  for (int i = 0; i <= 400; i++)
+    smash (foo, i);
+
+  return 1;
+}