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powerpc/64s/paca: EX_R3 can be merged with EX_DAR

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EX_R3 is used only for a small section of the bad stack handler.
Merge it with EX_DAR.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-05-21 23:15:49 +10:00 committed by Michael Ellerman
parent dbeea1d6b4
commit 635942ae53
1 changed files with 11 additions and 5 deletions
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16
arch/powerpc/include/asm/exception-64s.h
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@ -45,12 +45,11 @@
#define EX_DAR 40 #define EX_DAR 40
#define EX_DSISR 48 #define EX_DSISR 48
#define EX_CCR 52 #define EX_CCR 52
#define EX_R3 56 #define EX_CFAR 56
#define EX_CFAR 64 #define EX_PPR 64
#define EX_PPR 72 #define EX_CTR 72
#define EX_CTR 80
#define EX_SIZE 11 /* size in u64 units */ #define EX_SIZE 10 /* size in u64 units */
/* /*
* EX_LR is only used in EXSLB and where it does not overlap with EX_DAR * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
@ -60,6 +59,13 @@
*/ */
#define EX_LR EX_DAR #define EX_LR EX_DAR
/*
* EX_R3 is only used by the bad_stack handler. bad_stack reloads and
* saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
* with EX_DAR.
*/
#define EX_R3 EX_DAR
#ifdef CONFIG_RELOCATABLE #ifdef CONFIG_RELOCATABLE
#define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \ mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \