From: Michael Neuling <mikey@neuling.org>
To: benh@kernel.crashing.org
Cc: Linux PPC dev <linuxppc-dev@ozlabs.org>,
Paul Mackerras <paulus@samba.org>
Subject: [PATCH] powerpc: Fix single step emulation of 32bit overflowed branches
Date: Mon, 06 May 2013 21:32:40 +1000 [thread overview]
Message-ID: <25892.1367839960@ale.ozlabs.ibm.com> (raw)
Check truncate_if_32bit() on final write to nip.
Signed-off-by: Michael Neuling <mikey@neuling.org>
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index e15c521..99c7fc1 100644
--- 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 */
reply other threads:[~2013-05-06 11:32 UTC|newest]
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