powerpc: Fix single step emulation of 32bit overflowed branches

Check truncate_if_32bit() on final write to nip.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index e15c521..99c7fc1 100644 (file)
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -580,7 +580,7 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
                if (instr & 1)
                        regs->link = regs->nip;
                if (branch_taken(instr, regs))
-                       regs->nip = imm;
+                       regs->nip = truncate_if_32bit(regs->msr, imm);
                return 1;
 #ifdef CONFIG_PPC64
        case 17:        /* sc */