fdo-mirrors/xserver
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/xorg/xserver.git synced 2026-02-22 06:50:30 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

Implement bswap in x86emu.

Browse source 
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.
(cherry picked from commit c8d066a151)
This commit is contained in:
Adam Jackson 2008-06-23 13:59:48 -04:00
parent b0df9a6a42
commit 89d73d7595
1 changed files with 55 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

63
hw/xfree86/x86emu/ops2.c
View file

@ -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,