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| author | Xi Wang <xi.wang@gmail.com> | 2012-08-14 18:54:40 -0400 |
|---|---|---|
| committer | Werner Koch <wk@gnupg.org> | 2012-08-16 10:48:03 +0200 |
| commit | 2c54c4da19d3a79e9f749740828026dd41f0521a (patch) | |
| tree | acd346d2c038018c59db3697cc07e8fb0d36e073 /src/g10lib.h | |
| parent | 2196728e2252917849c1be94417258076767021b (diff) | |
| download | libgcrypt-2c54c4da19d3a79e9f749740828026dd41f0521a.tar.gz | |
Replace deliberate division by zero with _gcry_divide_by_zero.
* mpi/mpi-pow.c: Replace 1 / msize.
* mpi/mpih-div.c: Replace 1 / dsize.
* src/misc.c: Add _gcry_divide_by_zero.
--
1) Division by zero doesn't "provoke a signal" on architectures
like PowerPC.
2) C compilers like clang will optimize away these divisions, even
though the code tries "to make the compiler not remove" them.
This patch redirects these cases to _gcry_divide_by_zero.
Diffstat (limited to 'src/g10lib.h')
| -rw-r--r-- | src/g10lib.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/g10lib.h b/src/g10lib.h index ec86c976..c580c085 100644 --- a/src/g10lib.h +++ b/src/g10lib.h @@ -101,6 +101,8 @@ void _gcry_bug (const char *file, int line); void _gcry_assert_failed (const char *expr, const char *file, int line); #endif +void _gcry_divide_by_zero (void) JNLIB_GCC_A_NR; + const char *_gcry_gettext (const char *key) GCC_ATTR_FORMAT_ARG(1); void _gcry_fatal_error(int rc, const char *text ) JNLIB_GCC_A_NR; void _gcry_log( int level, const char *fmt, ... ) JNLIB_GCC_A_PRINTF(2,3); |