[PATCH] powerpc/sstep: mullw should calculate a 64 bit signed result

[Anton Blanchard]

From: Anton Blanchard <an...@samba.org>

mullw should do a 32 bit signed multiply and create a 64 bit signed
result. It currently truncates the result to 32 bits.

Signed-off-by: Anton Blanchard <an...@samba.org>
---
 arch/powerpc/lib/sstep.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index c4cda1afb49d..5e8418c28bd8 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1651,8 +1651,9 @@ int analyse_instr(struct instruction_op *op, const struct 
pt_regs *regs,
                        goto arith_done;
 
                case 235:       /* mullw */
-                       op->val = (unsigned int) regs->gpr[ra] *
-                               (unsigned int) regs->gpr[rb];
+                       op->val = (long)(int) regs->gpr[ra] *
+                               (int) regs->gpr[rb];
+
                        goto arith_done;
 
                case 266:       /* add */
-- 
2.11.0