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powerpc/32: Use stmw/lmw for registers save/restore in asm

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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>
This commit is contained in:
Christophe Leroy 2018-04-17 19:08:18 +02:00 committed by Michael Ellerman
parent 24c78586cc
commit a1f3ae3fe8
3 changed files with 16 additions and 4 deletions
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6
arch/powerpc/include/asm/ppc_asm.h
View File

@ -80,10 +80,8 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
#else
#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base)
#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base)
#define SAVE_NVGPRS(base) SAVE_GPR(13, base); SAVE_8GPRS(14, base); \
SAVE_10GPRS(22, base)
#define REST_NVGPRS(base) REST_GPR(13, base); REST_8GPRS(14, base); \
REST_10GPRS(22, base)
#define SAVE_NVGPRS(base) stmw 13, GPR0+4*13(base)
#define REST_NVGPRS(base) lmw 13, GPR0+4*13(base)
#endif
#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)

10
arch/powerpc/kernel/misc.S
View File

@ -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)

4
arch/powerpc/kernel/ppc_save_regs.S
View File

@ -25,6 +25,9 @@
*/
_GLOBAL(ppc_save_regs)
PPC_STL r0,0*SZL(r3)
#ifdef CONFIG_PPC32
stmw r2, 2*SZL(r3)
#else
PPC_STL r2,2*SZL(r3)
PPC_STL r3,3*SZL(r3)
PPC_STL r4,4*SZL(r3)
@ -55,6 +58,7 @@ _GLOBAL(ppc_save_regs)
PPC_STL r29,29*SZL(r3)
PPC_STL r30,30*SZL(r3)
PPC_STL r31,31*SZL(r3)
#endif
/* go up one stack frame for SP */
PPC_LL r4,0(r1)
PPC_STL r4,1*SZL(r3)