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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-11-25 08:10:53 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-03 15:01:32 +0100 |
| commit | d2e006036082e2dc394c5ec86c5bb88cc27c0749 (patch) | |
| tree | 55a73d0fd425ee36fe3af855dd7d97756ed18c23 /arch/powerpc/kernel/head_32.h | |
| parent | powerpc/32s: Use SPRN_SPRG_SCRATCH2 in DSI prolog (diff) | |
| download | linux-d2e006036082e2dc394c5ec86c5bb88cc27c0749.tar.xz linux-d2e006036082e2dc394c5ec86c5bb88cc27c0749.zip | |
powerpc/32: Use SPRN_SPRG_SCRATCH2 in exception prologs
Use SPRN_SPRG_SCRATCH2 as a third scratch register in
exception prologs in order to simplify them and avoid
data going back and forth from/to CR.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6f5c8a7faa8cc54acb89c55c20aa579a2f30a4e9.1606285014.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_32.h')
| -rw-r--r-- | arch/powerpc/kernel/head_32.h | 22 |
1 files changed, 7 insertions, 15 deletions
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h index 30f0b162abfd..541664d95702 100644 --- a/arch/powerpc/kernel/head_32.h +++ b/arch/powerpc/kernel/head_32.h @@ -40,7 +40,7 @@ .macro EXCEPTION_PROLOG_1 for_rtas=0 #ifdef CONFIG_VMAP_STACK - mr r11, r1 + mtspr SPRN_SPRG_SCRATCH2,r1 subi r1, r1, INT_FRAME_SIZE /* use r1 if kernel */ beq 1f mfspr r1,SPRN_SPRG_THREAD @@ -61,15 +61,10 @@ .macro EXCEPTION_PROLOG_2 handle_dar_dsisr=0 #ifdef CONFIG_VMAP_STACK - mtcr r10 - li r10, MSR_KERNEL & ~(MSR_IR | MSR_RI) /* can take DTLB miss */ - mtmsr r10 + li r11, MSR_KERNEL & ~(MSR_IR | MSR_RI) /* can take DTLB miss */ + mtmsr r11 isync -#else - stw r10,_CCR(r11) /* save registers */ -#endif - mfspr r10, SPRN_SPRG_SCRATCH0 -#ifdef CONFIG_VMAP_STACK + mfspr r11, SPRN_SPRG_SCRATCH2 stw r11,GPR1(r1) stw r11,0(r1) mr r11, r1 @@ -78,14 +73,12 @@ stw r1,0(r11) tovirt(r1, r11) /* set new kernel sp */ #endif + stw r10,_CCR(r11) /* save registers */ stw r12,GPR12(r11) stw r9,GPR9(r11) - stw r10,GPR10(r11) -#ifdef CONFIG_VMAP_STACK - mfcr r10 - stw r10, _CCR(r11) -#endif + mfspr r10,SPRN_SPRG_SCRATCH0 mfspr r12,SPRN_SPRG_SCRATCH1 + stw r10,GPR10(r11) stw r12,GPR11(r11) mflr r10 stw r10,_LINK(r11) @@ -99,7 +92,6 @@ stw r10, _DSISR(r11) .endif lwz r9, SRR1(r12) - andi. r10, r9, MSR_PR lwz r12, SRR0(r12) #else mfspr r12,SPRN_SRR0 |