powerpc/test_emulate_step: Add negative tests for prefixed addi

testcases for `paddi` instruction to cover the negative case,
if R is equal to 1 and RA is not equal to 0, the instruction
form is invalid.

Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200626095158.1031507-3-bala24@linux.ibm.com

diff --git a/arch/powerpc/lib/test_emulate_step.c b/arch/powerpc/lib/test_emulate_step.c
index 31065e9..7d11ab5 100644 (file)
--- a/arch/powerpc/lib/test_emulate_step.c
+++ b/arch/powerpc/lib/test_emulate_step.c
@@ -1130,6 +1130,16 @@ static struct compute_test compute_tests[] = {
                                .regs = {
                                        .gpr[21] = 0,
                                }
+                       },
+                       /* Invalid instruction form with R = 1 and RA != 0 */
+                       {
+                               .descr = "RA = R22(0), SI = 0, R = 1",
+                               .instr = TEST_PADDI(21, 22, 0, 1),
+                               .flags = NEGATIVE_TEST,
+                               .regs = {
+                                       .gpr[21] = 0,
+                                       .gpr[22] = 0,
+                               }
                        }
                }
        }