diff options
Diffstat (limited to 'target/m68k')
| -rw-r--r-- | target/m68k/translate.c | 62 |
1 files changed, 50 insertions, 12 deletions
diff --git a/target/m68k/translate.c b/target/m68k/translate.c index 97edb7b051..6678b57b97 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -1863,24 +1863,62 @@ DISAS_INSN(tas) DISAS_INSN(mull) { uint16_t ext; - TCGv reg; TCGv src1; - TCGv dest; + int sign; - /* The upper 32 bits of the product are discarded, so - muls.l and mulu.l are functionally equivalent. */ ext = read_im16(env, s); - if (ext & 0x87ff) { - gen_exception(s, s->pc - 4, EXCP_UNSUPPORTED); + + sign = ext & 0x800; + + if (ext & 0x400) { + if (!m68k_feature(s->env, M68K_FEATURE_QUAD_MULDIV)) { + gen_exception(s, s->pc - 4, EXCP_UNSUPPORTED); + return; + } + + SRC_EA(env, src1, OS_LONG, 0, NULL); + + if (sign) { + tcg_gen_muls2_i32(QREG_CC_Z, QREG_CC_N, src1, DREG(ext, 12)); + } else { + tcg_gen_mulu2_i32(QREG_CC_Z, QREG_CC_N, src1, DREG(ext, 12)); + } + /* if Dl == Dh, 68040 returns low word */ + tcg_gen_mov_i32(DREG(ext, 0), QREG_CC_N); + tcg_gen_mov_i32(DREG(ext, 12), QREG_CC_Z); + tcg_gen_or_i32(QREG_CC_Z, QREG_CC_Z, QREG_CC_N); + + tcg_gen_movi_i32(QREG_CC_V, 0); + tcg_gen_movi_i32(QREG_CC_C, 0); + + set_cc_op(s, CC_OP_FLAGS); return; } - reg = DREG(ext, 12); SRC_EA(env, src1, OS_LONG, 0, NULL); - dest = tcg_temp_new(); - tcg_gen_mul_i32(dest, src1, reg); - tcg_gen_mov_i32(reg, dest); - /* Unlike m68k, coldfire always clears the overflow bit. */ - gen_logic_cc(s, dest, OS_LONG); + if (m68k_feature(s->env, M68K_FEATURE_M68000)) { + tcg_gen_movi_i32(QREG_CC_C, 0); + if (sign) { + tcg_gen_muls2_i32(QREG_CC_N, QREG_CC_V, src1, DREG(ext, 12)); + /* QREG_CC_V is -(QREG_CC_V != (QREG_CC_N >> 31)) */ + tcg_gen_sari_i32(QREG_CC_Z, QREG_CC_N, 31); + tcg_gen_setcond_i32(TCG_COND_NE, QREG_CC_V, QREG_CC_V, QREG_CC_Z); + } else { + tcg_gen_mulu2_i32(QREG_CC_N, QREG_CC_V, src1, DREG(ext, 12)); + /* QREG_CC_V is -(QREG_CC_V != 0), use QREG_CC_C as 0 */ + tcg_gen_setcond_i32(TCG_COND_NE, QREG_CC_V, QREG_CC_V, QREG_CC_C); + } + tcg_gen_neg_i32(QREG_CC_V, QREG_CC_V); + tcg_gen_mov_i32(DREG(ext, 12), QREG_CC_N); + + tcg_gen_mov_i32(QREG_CC_Z, QREG_CC_N); + + set_cc_op(s, CC_OP_FLAGS); + } else { + /* The upper 32 bits of the product are discarded, so + muls.l and mulu.l are functionally equivalent. */ + tcg_gen_mul_i32(DREG(ext, 12), src1, DREG(ext, 12)); + gen_logic_cc(s, DREG(ext, 12), OS_LONG); + } } static void gen_link(DisasContext *s, uint16_t insn, int32_t offset) |