diff options
Diffstat (limited to 'src/devices')
| -rw-r--r-- | src/devices/oprom/x86emu/ops.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/src/devices/oprom/x86emu/ops.c b/src/devices/oprom/x86emu/ops.c index 536b4041b2..6917a08162 100644 --- a/src/devices/oprom/x86emu/ops.c +++ b/src/devices/oprom/x86emu/ops.c @@ -4301,16 +4301,25 @@ Handles opcode 0xe9 ****************************************************************************/ static void x86emuOp_jump_near_IMM(u8 X86EMU_UNUSED(op1)) { - int ip; + u32 ip; START_OF_INSTR(); DECODE_PRINTF("JMP\t"); - ip = (s16)fetch_word_imm(); - ip += (s16)M.x86.R_IP; - DECODE_PRINTF2("%04x\n", ip); - JMP_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, " NEAR "); - TRACE_AND_STEP(); - M.x86.R_IP = (u16)ip; + if (M.x86.mode & SYSMODE_PREFIX_DATA) { + ip = (u32)fetch_long_imm(); + ip += (u32)M.x86.R_EIP; + DECODE_PRINTF2("%08x\n", (u32)ip); + JMP_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, " NEAR "); + TRACE_AND_STEP(); + M.x86.R_EIP = (u32)ip; + } else { + ip = (s16)fetch_word_imm(); + ip += (s16)M.x86.R_IP; + DECODE_PRINTF2("%04x\n", (u16)ip); + JMP_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, " NEAR "); + TRACE_AND_STEP(); + M.x86.R_IP = (u16)ip; + } DECODE_CLEAR_SEGOVR(); END_OF_INSTR(); } |