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 <[email protected]>
[mpe: PPC32 is BE only, so drop the endian checks]
Signed-off-by: Michael Ellerman <[email protected]>

Author: chleroy

arch/powerpc/include/asm/ppc_asm.h

@@ -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)

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)

arch/powerpc/kernel/ppc_save_regs.S

@@ -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)