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

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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 <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2017-09-20 09:32:19 +10:00 committed by Michael Ellerman
parent 5bcaa4cc41
commit 1575fe06f6
1 changed files with 3 additions and 2 deletions
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arch/powerpc/lib/sstep.c
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@ -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 */