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NIOS2: Fix register restore sequence in epilogue

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This fix is critical.  The previous implementation leads to system
corruption.
This commit is contained in:
Sebastian Huber
2013-01-14 09:54:21 +01:00
parent f7351e4ea5
commit 0cce75e696
1 changed files with 3 additions and 3 deletions
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6
cpukit/score/cpu/nios2/nios2-eic-il-low-level.S
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@@ -160,7 +160,6 @@ do_thread_dispatch:
ldw r10, FRAME_OFFSET_R10(sp)
ldw r11, FRAME_OFFSET_R11(sp)
ldw r12, FRAME_OFFSET_R12(sp)
ldw r13, FRAME_OFFSET_R13(sp)
/*
* Disable interrupts.
@@ -180,15 +179,16 @@ do_thread_dispatch:
wrctl status, r15
/* Load thread dispatch necessary */
ldb r12, %gprel(_Per_CPU_Information + PER_CPU_DISPATCH_NEEDED)(gp)
ldb r13, %gprel(_Per_CPU_Information + PER_CPU_DISPATCH_NEEDED)(gp)
/* Is thread dispatch necessary? */
bne r12, zero, enable_interrupts_before_thread_dispatch
bne r13, zero, enable_interrupts_before_thread_dispatch
/* Enable Nios II specific thread dispatch */
stw zero, %gprel(_Nios2_Thread_dispatch_disabled)(gp)
/* Restore remaining volatile register */
ldw r13, FRAME_OFFSET_R13(sp)
ldw r14, FRAME_OFFSET_R14(sp)
ldw r15, FRAME_OFFSET_R15(sp)