diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 99c7fc1..a7ee978 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -100,8 +100,10 @@
 	ea = (signed short) instr;		/* sign-extend */
 	if (ra) {
 		ea += regs->gpr[ra];
-		if (instr & 0x04000000)		/* update forms */
-			regs->gpr[ra] = ea;
+		if (instr & 0x04000000) {		/* update forms */
+			if ((instr>>26) != 47) 		/* stmw is not an update form */
+				regs->gpr[ra] = ea;
+		}
 	}
 
 	return truncate_if_32bit(regs->msr, ea);
@@ -279,7 +281,7 @@
 		err = write_mem_aligned(val >> (nb - c) * 8, ea, c);
 		if (err)
 			return err;
-		++ea;
+		ea += c;
 	}
 	return 0;
 }