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powerpc/64: CONFIG_RELOCATABLE support for hmi interrupts

PATCH Applied Nicholas Piggin 2 participants 2 messages Jan 27, 2017 – Feb 8, 2017 PowerPC

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Nicholas Piggin

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PATCH 1/1 powerpc/64: CONFIG_RELOCATABLE support for hmi interrupts

The branch from hmi_exception_early to hmi_exception_realmode must use a "relocatable-style" branch, because it is branching from unrelocated exception code to beyond __end_interrupts.

Signed-off-by Nicholas Piggin <[email protected]>

---
This applies after the KVM RELOCATABLE series, and was split out from patch 3.

 arch/powerpc/include/asm/exception-64s.h | 8 ++++++++
 arch/powerpc/kernel/exceptions-64s.S     | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)
arch/powerpc/include/asm/exception-64s.h +8 -0
index 9a5dbfb2d9f2..6868b8739791 100644
@@ -236,6 +236,11 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 	mtctr	reg;							\
 	bctr
 
+#define BRANCH_LINK_TO_FAR(reg, label)					\
+	__LOAD_FAR_HANDLER(reg, label);					\
+	mtctr	reg;							\
+	bctrl
+
 /*
  * KVM requires __LOAD_FAR_HANDLER.
  *

@@ -260,6 +265,9 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 #define BRANCH_TO_COMMON(reg, label)					\
 	b	label
 
+#define BRANCH_LINK_TO_FAR(reg, label)					\
+	bl	label
+
 #define BRANCH_TO_KVM(reg, label)					\
 	b	label
arch/powerpc/kernel/exceptions-64s.S +1 -1
index 65a2559eeb7f..ee489b6ce5f9 100644
@@ -977,7 +977,7 @@ TRAMP_REAL_BEGIN(hmi_exception_early)
 	EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
 	EXCEPTION_PROLOG_COMMON_3(0xe60)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
-	bl	hmi_exception_realmode
+	BRANCH_LINK_TO_FAR(r4, hmi_exception_realmode)
 	/* Windup the stack. */
 	/* Move original HSRR0 and HSRR1 into the respective regs */
 	ld	r9,_MSR(r1)
Signature · 1 line
2.11.0