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powerpc/40x: Don't save CR in SPRN_SPRG_SCRATCH6

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We have r12 available, use it to keep CR around and don't
save it in SPRN_SPRG_SCRATCH6.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/019f314a98c107c4ca46e46c1cf402e9a44114a7.1590079969.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-05-21 16:56:04 +00:00 committed by Michael Ellerman
parent 797f4016f6
commit 3aacaa719b
1 changed files with 5 additions and 10 deletions
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15
arch/powerpc/kernel/head_40x.S
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@ -254,9 +254,8 @@ _ENTRY(saved_ksp_limit)
mtspr SPRN_SPRG_SCRATCH1, r11
mtspr SPRN_SPRG_SCRATCH3, r12
mtspr SPRN_SPRG_SCRATCH4, r9
mfcr r11
mfcr r12
mfspr r9, SPRN_PID
mtspr SPRN_SPRG_SCRATCH6, r11
mtspr SPRN_SPRG_SCRATCH5, r9
mfspr r10, SPRN_DEAR /* Get faulting address */
@ -323,9 +322,8 @@ _ENTRY(saved_ksp_limit)
* and call the heavyweights to help us out.
*/
mfspr r9, SPRN_SPRG_SCRATCH5
mfspr r11, SPRN_SPRG_SCRATCH6
mtspr SPRN_PID, r9
mtcr r11
mtcr r12
mfspr r9, SPRN_SPRG_SCRATCH4
mfspr r12, SPRN_SPRG_SCRATCH3
mfspr r11, SPRN_SPRG_SCRATCH1
@ -341,9 +339,8 @@ _ENTRY(saved_ksp_limit)
mtspr SPRN_SPRG_SCRATCH1, r11
mtspr SPRN_SPRG_SCRATCH3, r12
mtspr SPRN_SPRG_SCRATCH4, r9
mfcr r11
mfcr r12
mfspr r9, SPRN_PID
mtspr SPRN_SPRG_SCRATCH6, r11
mtspr SPRN_SPRG_SCRATCH5, r9
mfspr r10, SPRN_SRR0 /* Get faulting address */
@ -410,9 +407,8 @@ _ENTRY(saved_ksp_limit)
* and call the heavyweights to help us out.
*/
mfspr r9, SPRN_SPRG_SCRATCH5
mfspr r11, SPRN_SPRG_SCRATCH6
mtspr SPRN_PID, r9
mtcr r11
mtcr r12
mfspr r9, SPRN_SPRG_SCRATCH4
mfspr r12, SPRN_SPRG_SCRATCH3
mfspr r11, SPRN_SPRG_SCRATCH1
@ -556,9 +552,8 @@ finish_tlb_load:
/* Done...restore registers and get out of here.
*/
mfspr r9, SPRN_SPRG_SCRATCH5
mfspr r11, SPRN_SPRG_SCRATCH6
mtspr SPRN_PID, r9
mtcr r11
mtcr r12
mfspr r9, SPRN_SPRG_SCRATCH4
mfspr r12, SPRN_SPRG_SCRATCH3
mfspr r11, SPRN_SPRG_SCRATCH1