Commit 1575fe06 authored Sep 20, 2017 by Anton Blanchard Committed by Michael Ellerman Sep 20, 2017

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



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>

parent 5bcaa4cc

arch/powerpc/lib/sstep.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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 */