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bsps/powerpc: Unconditionally clear reservations

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This commit is contained in:
Sebastian Huber
2013-12-03 09:55:52 +01:00
parent f339afb47f
commit 057c294afd
1 changed files with 8 additions and 7 deletions
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15
c/src/lib/libcpu/powerpc/new-exceptions/cpu_asm.S
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@@ -267,18 +267,19 @@ PROC (_CPU_Context_switch):
mfmsr r5
mflr r6
mfcr r7
#if defined(RTEMS_MULTIPROCESSING) || defined(RTEMS_SMP)
/*
* We have to clear the reservation of the executing thread. See also
* Book E section 6.1.6.2 "Atomic Update Primitives".
* Book E section 6.1.6.2 "Atomic Update Primitives". Recent GCC
* versions use atomic operations in the C++ library for example.
*/
#if PPC_CONTEXT_OFFSET_GPR1 != PPC_CONTEXT_CACHE_LINE_0 \
|| !BSP_DATA_CACHE_ENABLED \
|| PPC_CACHE_ALIGNMENT != 32
#if PPC_CONTEXT_OFFSET_GPR1 != PPC_CONTEXT_CACHE_LINE_0 \
|| !BSP_DATA_CACHE_ENABLED \
|| PPC_CACHE_ALIGNMENT != 32
li r10, PPC_CONTEXT_OFFSET_GPR1
#endif
stwcx. r1, r3, r10
#endif
stwcx. r1, r3, r10
stw r1, PPC_CONTEXT_OFFSET_GPR1(r3)
stw r5, PPC_CONTEXT_OFFSET_MSR(r3)
stw r6, PPC_CONTEXT_OFFSET_LR(r3)