diff options
Diffstat (limited to 'target/m68k/translate.c')
| -rw-r--r-- | target/m68k/translate.c | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/target/m68k/translate.c b/target/m68k/translate.c index 5098f7e570..ffcc761d60 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -2825,19 +2825,39 @@ DISAS_INSN(illegal) gen_exception(s, s->base.pc_next, EXCP_ILLEGAL); } -/* ??? This should be atomic. */ DISAS_INSN(tas) { - TCGv dest; - TCGv src1; - TCGv addr; + int mode = extract32(insn, 3, 3); + int reg0 = REG(insn, 0); - dest = tcg_temp_new(); - SRC_EA(env, src1, OS_BYTE, 1, &addr); - gen_logic_cc(s, src1, OS_BYTE); - tcg_gen_ori_i32(dest, src1, 0x80); - DEST_EA(env, insn, OS_BYTE, dest, &addr); - tcg_temp_free(dest); + if (mode == 0) { + /* data register direct */ + TCGv dest = cpu_dregs[reg0]; + gen_logic_cc(s, dest, OS_BYTE); + tcg_gen_ori_tl(dest, dest, 0x80); + } else { + TCGv src1, addr; + + addr = gen_lea_mode(env, s, mode, reg0, OS_BYTE); + if (IS_NULL_QREG(addr)) { + gen_addr_fault(s); + return; + } + src1 = tcg_temp_new(); + tcg_gen_atomic_fetch_or_tl(src1, addr, tcg_constant_tl(0x80), + IS_USER(s), MO_SB); + gen_logic_cc(s, src1, OS_BYTE); + tcg_temp_free(src1); + + switch (mode) { + case 3: /* Indirect postincrement. */ + tcg_gen_addi_i32(AREG(insn, 0), addr, 1); + break; + case 4: /* Indirect predecrememnt. */ + tcg_gen_mov_i32(AREG(insn, 0), addr); + break; + } + } } DISAS_INSN(mull) |