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 <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 8fa09fa..14752ee 100644 (file)
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -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
 

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 34a04a5..76dd773 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -982,7 +982,7 @@ 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)