target-arm: Add ARM UDIV/SDIV support

Add support for UDIV and SDIV in ARM mode. This is a new optional
feature for A profile cores (Thumb mode has had UDIV and SDIV for
M profile cores for some time).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/target-arm/translate.c b/target-arm/translate.c
index deb0bcf..812a9e7 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -7639,6 +7639,25 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
                             store_reg(s, rn, tmp);
                         }
                         break;
+                    case 1:
+                    case 3:
+                        /* SDIV, UDIV */
+                        if (!arm_feature(env, ARM_FEATURE_ARM_DIV)) {
+                            goto illegal_op;
+                        }
+                        if (((insn >> 5) & 7) || (rd != 15)) {
+                            goto illegal_op;
+                        }
+                        tmp = load_reg(s, rm);
+                        tmp2 = load_reg(s, rs);
+                        if (insn & (1 << 21)) {
+                            gen_helper_udiv(tmp, tmp, tmp2);
+                        } else {
+                            gen_helper_sdiv(tmp, tmp, tmp2);
+                        }
+                        tcg_temp_free_i32(tmp2);
+                        store_reg(s, rn, tmp);
+                        break;
                     default:
                         goto illegal_op;
                     }