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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-11-25 10:10:52 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-03 17:01:32 +0300 |
| commit | de1cd0790697e67b728de43e8657bb52f528bfb9 (patch) | |
| tree | ab5eed22b35ceaacf8fa6816eec67f8492951c2c /arch/powerpc/include/asm/reg.h | |
| parent | 6285f9cff570bfd07b542840912c1d01bd5428e0 (diff) | |
| download | linux-de1cd0790697e67b728de43e8657bb52f528bfb9.tar.xz | |
powerpc/32s: Use SPRN_SPRG_SCRATCH2 in DSI prolog
Use SPRN_SPRG_SCRATCH2 as an alternative scratch register in
the early part of DSI prolog in order to avoid clobbering
SPRN_SPRG_SCRATCH0/1 used by other prologs.
The 603 doesn't like a jump from DataLoadTLBMiss to the 10 nops
that are now in the beginning of DSI exception as a result of
the feature section. To workaround this, add a jump as alternative.
It also avoids fetching 10 nops for nothing.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f9f8df2a2be93568768ef1ac793639f7914cf103.1606285014.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/include/asm/reg.h')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 0978a9a0a0d1..ee645e790446 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1204,6 +1204,7 @@ #ifdef CONFIG_PPC_BOOK3S_32 #define SPRN_SPRG_SCRATCH0 SPRN_SPRG0 #define SPRN_SPRG_SCRATCH1 SPRN_SPRG1 +#define SPRN_SPRG_SCRATCH2 SPRN_SPRG2 #define SPRN_SPRG_603_LRU SPRN_SPRG4 #endif |