X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=arch%2Fpowerpc%2Fkernel%2Fentry_64.S;h=e0bcf93542867d79e20c1d5951397813535545a2;hb=ab598b6680f1e74c267d1547ee352f3e1e530f89;hp=2d802e97097c55056757fab95a86aa400f352d99;hpb=7d6d637dac2050f30a1b57b0a3dc5de4a10616ba;p=safe%2Fjmp%2Flinux-2.6

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2d802e9..e0bcf93 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -57,12 +57,18 @@ system_call_common:
 	beq-	1f
 	ld	r1,PACAKSAVE(r13)
 1:	std	r10,0(r1)
-	crclr	so
 	std	r11,_NIP(r1)
 	std	r12,_MSR(r1)
 	std	r0,GPR0(r1)
 	std	r10,GPR1(r1)
 	ACCOUNT_CPU_USER_ENTRY(r10, r11)
+	/*
+	 * This "crclr so" clears CR0.SO, which is the error indication on
+	 * return from this system call.  There must be no cmp instruction
+	 * between it and the "mfcr r9" below, otherwise if XER.SO is set,
+	 * CR0.SO will get set, causing all system calls to appear to fail.
+	 */
+	crclr	so
 	std	r2,GPR2(r1)
 	std	r3,GPR3(r1)
 	std	r4,GPR4(r1)
@@ -512,31 +518,12 @@ _GLOBAL(ret_from_except_lite)
 #endif
 
 restore:
-	ld	r5,SOFTE(r1)
-#ifdef CONFIG_PPC_ISERIES
 BEGIN_FW_FTR_SECTION
-	cmpdi	0,r5,0
-	beq	4f
-	/* Check for pending interrupts (iSeries) */
-	ld	r3,PACALPPACAPTR(r13)
-	ld	r3,LPPACAANYINT(r3)
-	cmpdi	r3,0
-	beq+	4f			/* skip do_IRQ if no interrupts */
-
-	li	r3,0
-	stb	r3,PACASOFTIRQEN(r13)	/* ensure we are soft-disabled */
-#ifdef CONFIG_TRACE_IRQFLAGS
-	bl	.trace_hardirqs_off
-	mfmsr	r10
-#endif
-	ori	r10,r10,MSR_EE
-	mtmsrd	r10			/* hard-enable again */
-	addi	r3,r1,STACK_FRAME_OVERHEAD
-	bl	.do_IRQ
-	b	.ret_from_except_lite		/* loop back and handle more */
-4:
-END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
-#endif
+	ld	r5,SOFTE(r1)
+FW_FTR_SECTION_ELSE
+	b	iseries_check_pending_irqs
+ALT_FW_FTR_SECTION_END_IFCLR(FW_FEATURE_ISERIES)
+2:
 	TRACE_AND_RESTORE_IRQ(r5);
 
 	/* extract EE bit and use it to restore paca->hard_enabled */
@@ -592,6 +579,30 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
 	rfid
 	b	.	/* prevent speculative execution */
 
+iseries_check_pending_irqs:
+#ifdef CONFIG_PPC_ISERIES
+	ld	r5,SOFTE(r1)
+	cmpdi	0,r5,0
+	beq	2b
+	/* Check for pending interrupts (iSeries) */
+	ld	r3,PACALPPACAPTR(r13)
+	ld	r3,LPPACAANYINT(r3)
+	cmpdi	r3,0
+	beq+	2b			/* skip do_IRQ if no interrupts */
+
+	li	r3,0
+	stb	r3,PACASOFTIRQEN(r13)	/* ensure we are soft-disabled */
+#ifdef CONFIG_TRACE_IRQFLAGS
+	bl	.trace_hardirqs_off
+	mfmsr	r10
+#endif
+	ori	r10,r10,MSR_EE
+	mtmsrd	r10			/* hard-enable again */
+	addi	r3,r1,STACK_FRAME_OVERHEAD
+	bl	.do_IRQ
+	b	.ret_from_except_lite		/* loop back and handle more */
+#endif
+
 do_work:
 #ifdef CONFIG_PREEMPT
 	andi.	r0,r3,MSR_PR	/* Returning to user mode? */
@@ -685,10 +696,6 @@ _GLOBAL(enter_rtas)
 	std	r7,_DAR(r1)
 	mfdsisr	r8
 	std	r8,_DSISR(r1)
-	mfsrr0	r9
-	std	r9,_SRR0(r1)
-	mfsrr1	r10
-	std	r10,_SRR1(r1)
 
 	/* Temporary workaround to clear CR until RTAS can be modified to
 	 * ignore all bits.
@@ -749,6 +756,10 @@ _STATIC(rtas_return_loc)
 	mfspr	r4,SPRN_SPRG3	        /* Get PACA */
 	clrldi	r4,r4,2			/* convert to realmode address */
 
+	bcl	20,31,$+4
+0:	mflr	r3
+	ld	r3,(1f-0b)(r3)		/* get &.rtas_restore_regs */
+
 	mfmsr   r6
 	li	r0,MSR_RI
 	andc	r6,r6,r0
@@ -756,7 +767,6 @@ _STATIC(rtas_return_loc)
 	mtmsrd  r6
         
         ld	r1,PACAR1(r4)           /* Restore our SP */
-	LOAD_REG_IMMEDIATE(r3,.rtas_restore_regs)
         ld	r4,PACASAVEDMSR(r4)     /* Restore our MSR */
 
 	mtspr	SPRN_SRR0,r3
@@ -764,6 +774,9 @@ _STATIC(rtas_return_loc)
 	rfid
 	b	.	/* prevent speculative execution */
 
+	.align	3
+1:	.llong	.rtas_restore_regs
+
 _STATIC(rtas_restore_regs)
 	/* relocation is on at this point */
 	REST_GPR(2, r1)			/* Restore the TOC */
@@ -783,10 +796,6 @@ _STATIC(rtas_restore_regs)
 	mtdar	r7
 	ld	r8,_DSISR(r1)
 	mtdsisr	r8
-	ld	r9,_SRR0(r1)
-	mtsrr0	r9
-	ld	r10,_SRR1(r1)
-	mtsrr1	r10
 
         addi	r1,r1,RTAS_FRAME_SIZE	/* Unstack our frame */
 	ld	r0,16(r1)		/* get return address */
@@ -881,7 +890,7 @@ _GLOBAL(enter_prom)
 	mtlr    r0
         blr
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 #ifdef CONFIG_DYNAMIC_FTRACE
 _GLOBAL(mcount)
 _GLOBAL(_mcount)