Tulio Magno Quites Machado Filho 6ec52bf634 PowerPC: Fix a race condition when eliding a lock ... The previous code used to evaluate the preprocessor token is_lock_free to a variable before starting a transaction. This behavior can cause an error if another thread got the lock (without using a transaction) between the evaluation of the token and the beginning of the transaction. This bug can be triggered with the following order of events: 1. The lock accessed by is_lock_free is free. 2. Thread T1 evaluates is_lock_free and stores into register R1 that the lock is free. 3. Thread T2 acquires the same lock used in is_lock_free. 4. T1 begins the transaction, creating a memory barrier where is_lock_free is false, but R1 is true. 5. T1 reads R1 and doesn't abort the transaction. 6. T1 calls ELIDE_UNLOCK, which reads false from is_lock_free and decides to unlock a lock acquired by T2, leading to undefined behavior. This patch delays the evaluation of is_lock_free to inside a transaction by moving this part of the code to the macro ELIDE_LOCK. [BZ #18743] * sysdeps/powerpc/nptl/elide.h (__elide_lock): Move most of this code to... (ELIDE_LOCK): ...here. (__get_new_count): New function with part of the code from __elide_lock that updates the value of adapt_count after a transaction abort. (__elided_trylock): Moved this code to... (ELIDE_TRYLOCK): ...here.		2015-10-19 16:58:03 -02:00
..
bits	Move bits/atomic.h to atomic-machine.h (bug 14912).	2015-09-11 20:00:19 +00:00
fpu	Convert 231 sysdeps function definitions to prototype style.	2015-10-19 12:04:33 +00:00
nofpu
nptl	PowerPC: Fix a race condition when eliding a lock	2015-10-19 16:58:03 -02:00
power4
power5+/fpu
power6
power7/fpu
powerpc32	Fix powerpc32 lround, lroundf spurious exceptions (bug 19134).	2015-10-14 21:13:42 +00:00
powerpc64	PowerPC: Add comments to optimized strncpy	2015-10-01 17:36:55 -03:00
soft-fp
sys/platform
abort-instr.h
atomic-machine.h	Move bits/atomic.h to atomic-machine.h (bug 14912).	2015-09-11 20:00:19 +00:00
dl-procinfo.c	powerpc: Sync hwcap.h with kernel	2015-08-26 14:55:40 -03:00
dl-procinfo.h
dl-tls.c
dl-tls.h
ffs.c
fpu_control.h
gccframe.h
ifunc-sel.h
Implies
jmpbuf-offsets.h
jmpbuf-unwind.h
ldsodefs.h
locale-defines.sym
longjmp.c
machine-gmon.h
Makefile
math-tests.h
memusage.h
mp_clz_tab.c
novmx-longjmp.c
novmx-sigjmp.c
novmxsetjmp.h
preconfigure
rtld-global-offsets.sym
sched_cpucount.c
sigjmp.c
sotruss-lib.c
stackinfo.h
strcat.c
sysdep.h
test-arith.c
test-arithf.c
test-gettimebase.c
tls-macros.h
tst-stack-align.h
tst-tlsopt-powerpc.c
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