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powerpc: Document register clobbering in EXCEPTION_COMMON()

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Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Michael Ellerman 2014-07-15 21:15:37 +10:00 committed by Benjamin Herrenschmidt
parent 144beb2f53
commit a1d711c53f
1 changed files with 1 additions and 0 deletions
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arch/powerpc/include/asm/exception-64s.h
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@ -532,6 +532,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
.globl label##_common; \
label##_common: \
EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
/* Volatile regs are potentially clobbered here */ \
additions; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
bl hdlr; \