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alpha: Improve conditions under which PTR_MANGLE is defined

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After 0b1f8e3564, we now have
a __pointer_chk_guard_local for the static libc.
This commit is contained in:
Richard Henderson 2013-10-01 07:45:11 -07:00
parent ad4e70da03
commit b8123ef5b1
2 changed files with 26 additions and 31 deletions
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5
ports/ChangeLog.alpha
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@ -1,3 +1,8 @@
2013-10-01 Richard Henderson <rth@redhat.com>
* sysdeps/unix/alpha/sysdep.h (PTR_MANGLE): Improve conditions under
which it is defined.
2013-09-20 Andreas Schwab <schwab@linux-m68k.org>
* sysdeps/alpha/alphaev67/ffs.S (__ffs): Define as hidden.

52
ports/sysdeps/unix/alpha/sysdep.h
View File

@ -343,53 +343,43 @@ __LABEL(name) \
: : inline_syscall_clobbers); \
_sc_ret = _sc_0, _sc_err = _sc_19; \
}
#endif /* ASSEMBLER */
/* 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__
#ifdef __ASSEMBLER__
# if defined NOT_IN_libc && defined IS_IN_rtld
# 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) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
# define PTR_DEMANGLE(var) PTR_MANGLE(var)
# endif
#elif defined PIC
# ifdef __ASSEMBLER__
# elif defined SHARED
# define PTR_MANGLE(dst, src, tmp) \
ldq tmp, __pointer_chk_guard; \
xor src, tmp, dst
# define PTR_MANGLE2(dst, src, tmp) \
# else
# define PTR_MANGLE(dst, src, tmp) \
ldq tmp, __pointer_chk_guard_local; \
xor src, tmp, dst
# define PTR_DEMANGLE(dst, tmp) PTR_MANGLE(dst, dst, tmp)
# define PTR_DEMANGLE2(dst, tmp) PTR_MANGLE2(dst, dst, tmp)
# endif
# 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
# include <stdint.h>
# if (defined NOT_IN_libc && defined IS_IN_rtld) \
|| (!defined SHARED && (!defined NOT_IN_libc || defined IS_IN_libpthread))
extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
# define PTR_MANGLE(var) \
(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
# else
extern const uintptr_t __pointer_chk_guard attribute_relro;
# define PTR_MANGLE(var) \
# define PTR_MANGLE(var) \
(var) = (__typeof(var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
# define PTR_DEMANGLE(var) PTR_MANGLE(var)
# endif
#else
/* There exists generic C code that assumes that PTR_MANGLE is always
defined. When generating code for the static libc, we don't have
__pointer_chk_guard defined. Nor is there any place that would
initialize it if it were defined, so there's little point in doing
anything more than nothing. */
# ifndef __ASSEMBLER__
# define PTR_MANGLE(var)
# define PTR_DEMANGLE(var)
# endif
#endif
# define PTR_DEMANGLE(var) PTR_MANGLE(var)
#endif /* ASSEMBLER */