diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 12:50:14 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 13:22:03 +1100 |
| commit | 26c468860c32022ffe9caf16691764b77fb8eead (patch) | |
| tree | 99ec5511687b207f04d4c8416dd115ce6d7ab7c5 /arch/powerpc/kernel/head_40x.S | |
| parent | fcd4b43c36c69aa41e79a511edbb06c7020a6061 (diff) | |
powerpc/40x: Reorder a few instructions in critical exception prolog
In order to ease preparation for CONFIG_VMAP_STACK, reorder
a few instruction, especially save r1 into stack frame earlier.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c895ecf958c86d1736bdd2ff6f36626b55f35fd2.1615552866.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_40x.S')
| -rw-r--r-- | arch/powerpc/kernel/head_40x.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S index 067ae1302c1c..5b337bf49bcb 100644 --- a/arch/powerpc/kernel/head_40x.S +++ b/arch/powerpc/kernel/head_40x.S @@ -119,6 +119,9 @@ _ENTRY(saved_ksp_limit) lwz r11,TASK_STACK-THREAD(r11) /* this thread's kernel stack */ 1: addi r11,r11,THREAD_SIZE-INT_FRAME_SIZE /* Alloc an excpt frm */ tophys(r11,r11) + stw r1,GPR1(r11) + stw r1,0(r11) + tovirt(r1,r11) stw r10,_CCR(r11) /* save various registers */ stw r12,GPR12(r11) stw r9,GPR9(r11) @@ -129,14 +132,11 @@ _ENTRY(saved_ksp_limit) stw r10,GPR10(r11) stw r12,GPR11(r11) mfspr r12,SPRN_DEAR /* save DEAR and ESR in the frame */ - stw r12,_DEAR(r11) /* since they may have had stuff */ mfspr r9,SPRN_ESR /* in them at the point where the */ + stw r12,_DEAR(r11) /* since they may have had stuff */ stw r9,_ESR(r11) /* exception was taken */ mfspr r12,SPRN_SRR2 - stw r1,GPR1(r11) mfspr r9,SPRN_SRR3 - stw r1,0(r11) - tovirt(r1,r11) rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */ stw r0,GPR0(r11) lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */ |