powerpc/64: Fix HMI exception on LE with CONFIG_RELOCATABLE=y

Prior to commit 2337d207288f ("powerpc/64: CONFIG_RELOCATABLE support for hmi
interrupts"), the branch from hmi_exception_early() to hmi_exception_realmode()
was just a bl hmi_exception_realmode, which the linker would turn into a bl to
the local entry point of hmi_exception_realmode. This was broken when
CONFIG_RELOCATABLE=y because hmi_exception_realmode() is not in the low part of
the kernel text that is copied down to 0x0.

But in fixing that, we added a new bug on little endian kernels. Because the
branch is now a bctrl when CONFIG_RELOCATABLE=y, we branch to the global entry
point of hmi_exception_realmode(). The global entry point must be called with
r12 containing the address of hmi_exception_realmode(), because it uses that
value to calculate the TOC value (r2).

This may manifest as a checkstop, because we take a junk value from r12 which
came from HSRR1, add a small constant to it and then use that as the TOC
pointer. The HSRR1 value will have 0x9 as the top nibble, which puts it above
RAM and somewhere in MMIO space.

Fix it by changing the BRANCH_LINK_TO_FAR() macro to always use r12 to load the
label we're branching to. This means r12 will be setup correctly on LE, fixing
this bug, and r12 is also volatile across function calls on BE so it's a good
choice anyway.

Fixes: 2337d207288f ("powerpc/64: CONFIG_RELOCATABLE support for hmi interrupts")
Reported-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Acked-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 14752eee3d0c44816a61b395970186c1e56d4a21..ed3beadd2cc515d1b8a99b4836b3f06c1a97a87c 100644 (file)
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -236,9 +236,9 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
        mtctr   reg;                                                    \
        bctr
 
-#define BRANCH_LINK_TO_FAR(reg, label)                                 \
-       __LOAD_FAR_HANDLER(reg, label);                                 \
-       mtctr   reg;                                                    \
+#define BRANCH_LINK_TO_FAR(label)                                      \
+       __LOAD_FAR_HANDLER(r12, label);                                 \
+       mtctr   r12;                                                    \
        bctrl
 
 /*
@@ -265,7 +265,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 #define BRANCH_TO_COMMON(reg, label)                                   \
        b       label
 
-#define BRANCH_LINK_TO_FAR(reg, label)                                 \
+#define BRANCH_LINK_TO_FAR(label)                                      \
        bl      label
 
 #define BRANCH_TO_KVM(reg, label)                                      \

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 857bf7c5b9465aff743b3e62094cc47d808c8c92..6353019966e6a3bd15afa32d7318c47810a1d8e9 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
-       BRANCH_LINK_TO_FAR(r4, hmi_exception_realmode)
+       BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */
        /* Windup the stack. */
        /* Move original HSRR0 and HSRR1 into the respective regs */
        ld      r9,_MSR(r1)