Define PTR_MANGLE, PTR_MANGLE2, PTR_DEMANGLE, PTR_DEMANGLE2.

diff --git a/sysdeps/unix/alpha/sysdep.h b/sysdeps/unix/alpha/sysdep.h
index a154db8..2260ec5 100644 (file)
--- a/sysdeps/unix/alpha/sysdep.h
+++ b/sysdeps/unix/alpha/sysdep.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992, 1995, 1996, 2000, 2003, 2004
+/* Copyright (C) 1992, 1995, 1996, 2000, 2003, 2004, 2006
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Brendan Kehoe (brendan@zen.org).
@@ -397,4 +397,42 @@ __LABEL(name)                                              \
        _sc_ret = _sc_0, _sc_err = _sc_19;                      \
 }
 
+/* Pointer mangling support.  Note that tls access is slow enough that
+   we don't deoptimize things by placing the pointer check value there.  */
+
+#include <stdint.h>
+
+#if defined NOT_IN_libc && defined IS_IN_rtld
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(dst, src, tmp)                            \
+       ldah    tmp, __pointer_chk_guard_local($29) !gprelhigh; \
+       ldq     tmp, __pointer_chk_guard_local(tmp) !gprellow;  \
+       xor     src, tmp, dst
+#  define PTR_MANGLE2(dst, src, tmp)                           \
+       xor     src, tmp, dst
+#  define PTR_DEMANGLE(dst, tmp)   PTR_MANGLE(dst, dst, tmp)
+#  define PTR_DEMANGLE2(dst, tmp)  PTR_MANGLE2(dst, dst, tmp)
+# else
+extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
+#  define PTR_MANGLE(var)      \
+       (var) = (void *) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
+#  define PTR_DEMANGLE(var)  PTR_MANGLE(var)
+# endif
+#elif defined PIC
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(dst, src, tmp)            \
+       ldq     tmp, __pointer_chk_guard;       \
+       xor     src, tmp, dst
+#  define PTR_MANGLE2(dst, src, tmp)           \
+       xor     src, tmp, dst
+#  define PTR_DEMANGLE(dst, tmp)   PTR_MANGLE(dst, dst, tmp)
+#  define PTR_DEMANGLE2(dst, tmp)  PTR_MANGLE2(dst, dst, tmp)
+# else
+extern uintptr_t __pointer_chk_guard attribute_relro;
+#  define PTR_MANGLE(var)      \
+       (var) = (void *) ((uintptr_t) (var) ^ __pointer_chk_guard)
+#  define PTR_DEMANGLE(var)  PTR_MANGLE(var)
+# endif
+#endif
+
 #endif /* ASSEMBLER */