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| author | Christophe Leroy | 2018-04-17 19:08:18 +0200 |
|---|---|---|
| committer | Michael Ellerman | 2018-05-17 16:09:06 +0200 |
| commit | a1f3ae3fe8a1883c339f1bc89d1c941b3809e084 (patch) | |
| tree | d830fbdffa3dac41aba47c6683b3fe08413ebc7e /arch/powerpc/kernel/misc.S | |
| parent | powerpc: Avoid an unnecessary test and branch in longjmp() (diff) | |
| download | kernel-qcow2-linux-a1f3ae3fe8a1883c339f1bc89d1c941b3809e084.tar.gz kernel-qcow2-linux-a1f3ae3fe8a1883c339f1bc89d1c941b3809e084.tar.xz kernel-qcow2-linux-a1f3ae3fe8a1883c339f1bc89d1c941b3809e084.zip | |
powerpc/32: Use stmw/lmw for registers save/restore in asm
arch/powerpc/Makefile activates -mmultiple on BE PPC32 configs
in order to use multiple word instructions in functions entry/exit.
The patch does the same for the asm parts, for consistency.
On processors like the 8xx on which insn fetching is pretty slow,
this speeds up registers save/restore.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: PPC32 is BE only, so drop the endian checks]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/misc.S')
| -rw-r--r-- | arch/powerpc/kernel/misc.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S index c60b70da1e4b..2f18fc1368d0 100644 --- a/arch/powerpc/kernel/misc.S +++ b/arch/powerpc/kernel/misc.S @@ -60,6 +60,10 @@ _GLOBAL(setjmp) PPC_STL r0,0(r3) PPC_STL r1,SZL(r3) PPC_STL r2,2*SZL(r3) +#ifdef CONFIG_PPC32 + mfcr r12 + stmw r12, 3*SZL(r3) +#else mfcr r0 PPC_STL r0,3*SZL(r3) PPC_STL r13,4*SZL(r3) @@ -81,10 +85,15 @@ _GLOBAL(setjmp) PPC_STL r29,20*SZL(r3) PPC_STL r30,21*SZL(r3) PPC_STL r31,22*SZL(r3) +#endif li r3,0 blr _GLOBAL(longjmp) +#ifdef CONFIG_PPC32 + lmw r12, 3*SZL(r3) + mtcrf 0x38, r12 +#else PPC_LL r13,4*SZL(r3) PPC_LL r14,5*SZL(r3) PPC_LL r15,6*SZL(r3) @@ -106,6 +115,7 @@ _GLOBAL(longjmp) PPC_LL r31,22*SZL(r3) PPC_LL r0,3*SZL(r3) mtcrf 0x38,r0 +#endif PPC_LL r0,0(r3) PPC_LL r1,SZL(r3) PPC_LL r2,2*SZL(r3) |