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Implement bswap in x86emu.

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Yes, this is a 486+ instruction and thus not strictly legal in vm86
mode, but enough BIOSes use it (looking at you VIA) that we might as
well implement it.
This commit is contained in:
Adam Jackson 2008-06-23 13:59:48 -04:00
parent b55fbca4f0
commit c8d066a151
1 changed files with 55 additions and 8 deletions
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63
hw/xfree86/x86emu/ops2.c
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@ -40,6 +40,12 @@
#include "x86emu/x86emui.h"
#undef bswap_32
#define bswap_32(x) (((x & 0xff000000) >> 24) | \
((x & 0x00ff0000) >> 8) | \
((x & 0x0000ff00) << 8) | \
((x & 0x000000ff) << 24))
/*----------------------------- Implementation ----------------------------*/
/****************************************************************************
@ -2571,6 +2577,47 @@ static void x86emuOp2_movsx_word_R_RM(u8 X86EMU_UNUSED(op2))
END_OF_INSTR();
}
/* Handles opcodes 0xc8-0xcf */
static void x86emuOp2_bswap(u8 X86EMU_UNUSED(op2))
{
START_OF_INSTR();
DECODE_PRINTF("BSWAP\n");
TRACE_AND_STEP();
switch (op2) {
case 0xc8:
M.x86.R_EAX = bswap_32(M.x86.R_EAX);
break;
case 0xc9:
M.x86.R_ECX = bswap_32(M.x86.R_ECX);
break;
case 0xca:
M.x86.R_EDX = bswap_32(M.x86.R_EDX);
break;
case 0xcb:
M.x86.R_EBX = bswap_32(M.x86.R_EBX);
break;
case 0xcc:
M.x86.R_ESP = bswap_32(M.x86.R_ESP);
break;
case 0xcd:
M.x86.R_EBP = bswap_32(M.x86.R_EBP);
break;
case 0xce:
M.x86.R_ESI = bswap_32(M.x86.R_ESI);
break;
case 0xcf:
M.x86.R_EDI = bswap_32(M.x86.R_EDI);
break;
default:
/* can't happen */
break;
}
DECODE_CLEAR_SEGOVR();
END_OF_INSTR();
}
/***************************************************************************
* Double byte operation code table:
**************************************************************************/
@ -2788,14 +2835,14 @@ 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,