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powerpc/tm: Save MSR to PACA before RFID 

As other exit points, move SRR1 (MSR) into paca->tm_scratch, so, if
there is a TM Bad Thing in RFID, it is easy to understand what was the
SRR1 value being used.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Breno Leitao 2018-11-26 18:11:58 -02:00 committed by Michael Ellerman
parent e1c3743e1a
commit 63a0d6b03b
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/entry_64.S
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@ -291,6 +291,10 @@ BEGIN_FTR_SECTION
HMT_MEDIUM_LOW
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
std r8, PACATMSCRATCH(r13)
#endif
ld r13,GPR13(r1) /* only restore r13 if returning to usermode */
ld r2,GPR2(r1)
ld r1,GPR1(r1)