diff options
Diffstat (limited to 'src/devices/emulator/x86emu/ops2.c')
| -rw-r--r-- | src/devices/emulator/x86emu/ops2.c | 79 |
1 files changed, 70 insertions, 9 deletions
diff --git a/src/devices/emulator/x86emu/ops2.c b/src/devices/emulator/x86emu/ops2.c index 448d968570..acefc304c8 100644 --- a/src/devices/emulator/x86emu/ops2.c +++ b/src/devices/emulator/x86emu/ops2.c @@ -149,8 +149,10 @@ void x86emuOp2_long_jump(u8 op2) target += (s16) M.x86.R_IP; DECODE_PRINTF2("%04x\n", target); TRACE_AND_STEP(); - if (cond) + if (cond) { M.x86.R_IP = (u16)target; + JMP_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, M.x86.R_IP, " LONG COND "); + } DECODE_CLEAR_SEGOVR(); END_OF_INSTR(); } @@ -1485,6 +1487,65 @@ void x86emuOp2_movsx_word_R_RM(u8 X86EMU_UNUSED(op2)) END_OF_INSTR(); } +/**************************************************************************** +REMARKS: +Handles opcode 0x0f,0xC8-0xCF +****************************************************************************/ +s32 x86emu_bswap(s32 reg) +{ + // perform the byte swap + s32 temp = reg; + reg = (temp & 0xFF000000) >> 24; + reg |= (temp & 0xFF0000) >> 8; + reg |= (temp & 0xFF00) << 8; + reg |= (temp & 0xFF) << 24; + return reg; +} + +void x86emuOp2_bswap(u8 op2) +{ + /* byte swap 32 bit register */ + START_OF_INSTR(); + DECODE_PRINTF("BSWAP\t"); + switch (op2) { + case 0xc8: + DECODE_PRINTF("EAX\n"); + M.x86.R_EAX = x86emu_bswap(M.x86.R_EAX); + break; + case 0xc9: + DECODE_PRINTF("ECX\n"); + M.x86.R_ECX = x86emu_bswap(M.x86.R_ECX); + break; + case 0xca: + DECODE_PRINTF("EDX\n"); + M.x86.R_EDX = x86emu_bswap(M.x86.R_EDX); + break; + case 0xcb: + DECODE_PRINTF("EBX\n"); + M.x86.R_EBX = x86emu_bswap(M.x86.R_EBX); + break; + case 0xcc: + DECODE_PRINTF("ESP\n"); + M.x86.R_ESP = x86emu_bswap(M.x86.R_ESP); + break; + case 0xcd: + DECODE_PRINTF("EBP\n"); + M.x86.R_EBP = x86emu_bswap(M.x86.R_EBP); + break; + case 0xce: + DECODE_PRINTF("ESI\n"); + M.x86.R_ESI = x86emu_bswap(M.x86.R_ESI); + break; + case 0xcf: + DECODE_PRINTF("EDI\n"); + M.x86.R_EDI = x86emu_bswap(M.x86.R_EDI); + break; + } + TRACE_AND_STEP(); + DECODE_CLEAR_SEGOVR(); + END_OF_INSTR(); +} + /*************************************************************************** * Double byte operation code table: **************************************************************************/ @@ -1702,14 +1763,14 @@ void (*x86emu_optab2[256])(u8) = /* 0xc5 */ x86emuOp2_illegal_op, /* 0xc6 */ x86emuOp2_illegal_op, /* 0xc7 */ x86emuOp2_illegal_op, -/* 0xc8 */ x86emuOp2_illegal_op, /* TODO: bswap */ -/* 0xc9 */ x86emuOp2_illegal_op, /* TODO: bswap */ -/* 0xca */ x86emuOp2_illegal_op, /* TODO: bswap */ -/* 0xcb */ x86emuOp2_illegal_op, /* TODO: bswap */ -/* 0xcc */ x86emuOp2_illegal_op, /* TODO: bswap */ -/* 0xcd */ x86emuOp2_illegal_op, /* TODO: bswap */ -/* 0xce */ x86emuOp2_illegal_op, /* TODO: bswap */ -/* 0xcf */ x86emuOp2_illegal_op, /* TODO: bswap */ +/* 0xc8 */ x86emuOp2_bswap, +/* 0xc9 */ x86emuOp2_bswap, +/* 0xca */ x86emuOp2_bswap, +/* 0xcb */ x86emuOp2_bswap, +/* 0xcc */ x86emuOp2_bswap, +/* 0xcd */ x86emuOp2_bswap, +/* 0xce */ x86emuOp2_bswap, +/* 0xcf */ x86emuOp2_bswap, /* 0xd0 */ x86emuOp2_illegal_op, /* 0xd1 */ x86emuOp2_illegal_op, |