diff options
Diffstat (limited to 'arch/powerpc/include/asm/exception-64s.h')
| -rw-r--r-- | arch/powerpc/include/asm/exception-64s.h | 49 |
1 files changed, 40 insertions, 9 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h index 183d73b6ed99..9a318973af05 100644 --- a/arch/powerpc/include/asm/exception-64s.h +++ b/arch/powerpc/include/asm/exception-64s.h @@ -36,20 +36,38 @@ */ #include <asm/head-64.h> +/* PACA save area offsets (exgen, exmc, etc) */ #define EX_R9 0 #define EX_R10 8 #define EX_R11 16 #define EX_R12 24 #define EX_R13 32 -#define EX_SRR0 40 -#define EX_DAR 48 -#define EX_DSISR 56 -#define EX_CCR 60 -#define EX_R3 64 -#define EX_LR 72 -#define EX_CFAR 80 -#define EX_PPR 88 /* SMT thread status register (priority) */ -#define EX_CTR 96 +#define EX_DAR 40 +#define EX_DSISR 48 +#define EX_CCR 52 +#define EX_CFAR 56 +#define EX_PPR 64 +#if defined(CONFIG_RELOCATABLE) +#define EX_CTR 72 +#define EX_SIZE 10 /* size in u64 units */ +#else +#define EX_SIZE 9 /* size in u64 units */ +#endif + +/* + * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR + * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole + * in the save area so it's not necessary to overlap them. Could be used + * for future savings though if another 4 byte register was to be saved. + */ +#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 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ @@ -236,6 +254,19 @@ END_FTR_SECTION_NESTED(ftr,ftr,943) #define kvmppc_interrupt kvmppc_interrupt_pr #endif +/* + * Branch to label using its 0xC000 address. This results in instruction + * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned + * on using mtmsr rather than rfid. + * + * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than + * load KBASE for a slight optimisation. + */ +#define BRANCH_TO_C000(reg, label) \ + __LOAD_HANDLER(reg, label); \ + mtctr reg; \ + bctr + #ifdef CONFIG_RELOCATABLE #define BRANCH_TO_COMMON(reg, label) \ __LOAD_HANDLER(reg, label); \ |