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Define PTR_MANGLE, PTR_MANGLE2, PTR_DEMANGLE, PTR_DEMANGLE2.

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This commit is contained in:
Ulrich Drepper 2006-01-13 21:46:29 +00:00
parent 9847c5cb2f
commit 12d4d22726
1 changed files with 39 additions and 1 deletions
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40
sysdeps/unix/alpha/sysdep.h
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@ -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 */