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Fix atomic_full_barrier on x86 and x86_64.
This fixes BZ #17403 by defining atomic_full_barrier, atomic_read_barrier, and atomic_write_barrier on x86 and x86_64. A full barrier is implemented through an atomic idempotent modification to the stack and not through using mfence because the latter can supposedly be somewhat slower due to having to provide stronger guarantees wrt. self-modifying code, for example.
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@ -1,3 +1,11 @@
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2015-06-23 Torvald Riegel <triegel@redhat.com>
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[BZ #17403]
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* sysdeps/x86_64/bits/atomic.h: (atomic_full_barrier,
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atomic_read_barrier, atomic_write_barrier): Define.
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* sysdeps/i386/i486/bits/atomic.h (atomic_full_barrier,
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atomic_read_barrier, atomic_write_barrier): Define.
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2015-06-23 Joseph Myers <joseph@codesourcery.com>
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* math/Makefile [$(PERL) != no]
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25
NEWS
25
NEWS
@ -12,18 +12,19 @@ Version 2.22
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438, 4719, 6792, 13028, 13064, 14094, 14841, 14906, 14958, 15319, 15467,
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15790, 15969, 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512,
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16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293, 17322,
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17523, 17542, 17569, 17581, 17588, 17596, 17620, 17621, 17628, 17631,
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17692, 17711, 17715, 17776, 17779, 17792, 17836, 17912, 17916, 17930,
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17932, 17944, 17949, 17964, 17965, 17967, 17969, 17977, 17978, 17987,
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17991, 17996, 17998, 17999, 18007, 18019, 18020, 18029, 18030, 18032,
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18034, 18036, 18038, 18039, 18042, 18043, 18046, 18047, 18049, 18068,
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18080, 18093, 18100, 18104, 18110, 18111, 18116, 18125, 18128, 18138,
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18185, 18196, 18197, 18206, 18210, 18211, 18217, 18219, 18220, 18221,
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18234, 18244, 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18397,
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18409, 18410, 18412, 18418, 18422, 18434, 18444, 18468, 18469, 18470,
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18479, 18483, 18495, 18496, 18497, 18498, 18507, 18512, 18513, 18519,
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18520, 18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18536,
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18539, 18540, 18542, 18544, 18545, 18546, 18547, 18553, 18558, 18569.
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17403, 17523, 17542, 17569, 17581, 17588, 17596, 17620, 17621, 17628,
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17631, 17692, 17711, 17715, 17776, 17779, 17792, 17836, 17912, 17916,
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17930, 17932, 17944, 17949, 17964, 17965, 17967, 17969, 17977, 17978,
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17987, 17991, 17996, 17998, 17999, 18007, 18019, 18020, 18029, 18030,
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18032, 18034, 18036, 18038, 18039, 18042, 18043, 18046, 18047, 18049,
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18068, 18080, 18093, 18100, 18104, 18110, 18111, 18116, 18125, 18128,
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18138, 18185, 18196, 18197, 18206, 18210, 18211, 18217, 18219, 18220,
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18221, 18234, 18244, 18247, 18287, 18319, 18324, 18333, 18346, 18371,
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18397, 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18468, 18469,
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18470, 18479, 18483, 18495, 18496, 18497, 18498, 18507, 18512, 18513,
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18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534,
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18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547, 18553, 18558,
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18569.
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* Cache information can be queried via sysconf() function on s390 e.g. with
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_SC_LEVEL1_ICACHE_SIZE as argument.
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@ -535,3 +535,10 @@ typedef uintmax_t uatomic_max_t;
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#define atomic_or(mem, mask) __arch_or_body (LOCK_PREFIX, mem, mask)
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#define catomic_or(mem, mask) __arch_or_body (__arch_cprefix, mem, mask)
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/* We don't use mfence because it is supposedly slower due to having to
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provide stronger guarantees (e.g., regarding self-modifying code). */
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#define atomic_full_barrier() \
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__asm __volatile (LOCK_PREFIX "orl $0, (%%esp)" ::: "memory")
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#define atomic_read_barrier() __asm ("" ::: "memory")
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#define atomic_write_barrier() __asm ("" ::: "memory")
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@ -472,3 +472,10 @@ typedef uintmax_t uatomic_max_t;
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#define atomic_or(mem, mask) __arch_or_body (LOCK_PREFIX, mem, mask)
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#define catomic_or(mem, mask) __arch_or_body (__arch_cprefix, mem, mask)
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/* We don't use mfence because it is supposedly slower due to having to
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provide stronger guarantees (e.g., regarding self-modifying code). */
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#define atomic_full_barrier() \
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__asm __volatile (LOCK_PREFIX "orl $0, (%%rsp)" ::: "memory")
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#define atomic_read_barrier() __asm ("" ::: "memory")
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#define atomic_write_barrier() __asm ("" ::: "memory")
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