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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* bcd.c: BCD oriented x86 instruction emulation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "plex86.h"
#include "monitor.h"
void
AAD(vm_t *vm)
{
Bit32u eflags;
Bit16u ax;
Bit8u imm8;
ax = G_AX(vm);
imm8 = vm->i.Ib;
asm volatile (
"movb %b3, 1f \n\t"
"jmp 0f \n\t"
"0: \n\t"
".byte 0xD5 \n\t" /* AAD base(normally 10) */
"1: \n\t"
".byte 0x0A \n\t"
"pushfl \n\t"
"popl %0"
: "=g" (eflags), "=a" (ax)
: "1" (ax), "q" (imm8)
: "memory", "cc"
);
/* +++ OAC flags are actually undefined for ADD */
SetOSZAPC(vm, eflags);
G_AX(vm) = ax;
}
void
AAA(vm_t *vm)
{
Bit32u arithmetic_eflags, eflags;
Bit16u ax;
arithmetic_eflags = read_eflags(vm) & 0x000008d5;
eflags = 0; /* keep compiler quiet */
ax = G_AX(vm);
asm volatile (
/* First copy guest arithmetic flags to monitor flags */
"pushfl \n\t" /* Get mon flags */
"popl %0 \n\t"
"andl $0xfffff700, %0 \n\t" /* Erase mon arithmetic flags */
"orl %4, %0 \n\t" /* Or in guest arithmetic flags */
"pushl %0 \n\t" /* Set flags in mon */
"popfl \n\t"
"aaa \n\t" /* Do operation */
"pushfl \n\t" /* Get resultant flags */
"popl %0"
: "=r" (eflags), "=a" (ax)
: "1" (ax), "0" (eflags), "g" (arithmetic_eflags)
: "memory", "cc"
);
G_AX(vm) = ax;
SetOSZAPC(vm, eflags);
}
void
AAM(vm_t *vm)
{
Bit32u arithmetic_eflags, eflags;
Bit16u ax;
Bit8u imm8;
arithmetic_eflags = read_eflags(vm) & 0x000008d5;
eflags = 0; /* keep compiler quiet */
ax = G_AX(vm);
imm8 = vm->i.Ib;
asm volatile (
"movb %b5, 1f \n\t"
"jmp 0f \n\t"
"0: \n\t"
/* copy guest arithmetic flags to monitor flags */
"pushfl \n\t" /* Get mon flags */
"popl %0 \n\t"
"andl $0xfffff700, %0 \n\t" /* Erase mon arithmetic flags */
"orl %4, %0 \n\t" /* Or in guest arithmetic flags */
"pushl %0 \n\t" /* Set flags in mon */
"popfl \n\t"
".byte 0xD4 \n\t" /* AAM base(normally 10) */
"1: \n\t"
".byte 0x0A \n\t"
"pushfl \n\t" /* Get resultant flags */
"popl %0"
: "=r" (eflags), "=a" (ax)
: "1" (ax), "0" (eflags), "g" (arithmetic_eflags), "q" (imm8)
: "memory", "cc"
);
G_AX(vm) = ax;
SetOSZAPC(vm, eflags);
}
void
AAS(vm_t *vm)
{
Bit32u arithmetic_eflags, eflags;
Bit16u ax;
arithmetic_eflags = read_eflags(vm) & 0x000008d5;
eflags = 0; /* keep compiler quiet */
ax = G_AX(vm);
asm volatile (
/* copy guest arithmetic flags to monitor flags */
"pushfl \n\t" /* Get mon flags */
"popl %0 \n\t"
"andl $0xfffff700, %0 \n\t" /* Erase mon arithmetic flags */
"orl %4, %0 \n\t" /* Or in guest arithmetic flags */
"pushl %0 \n\t" /* Set flags in mon */
"popfl \n\t"
"aas \n\t"
"pushfl \n\t" /* Get resultant flags */
"popl %0"
: "=r" (eflags), "=a" (ax)
: "1" (ax), "0" (eflags), "g" (arithmetic_eflags)
: "memory", "cc"
);
G_AX(vm) = ax;
SetOSZAPC(vm, eflags);
}
void
DAA(vm_t *vm)
{
Bit32u arithmetic_eflags, eflags;
Bit16u ax;
arithmetic_eflags = read_eflags(vm) & 0x000008d5;
eflags = 0; /* keep compiler quiet */
ax = G_AX(vm);
asm volatile (
/* copy guest arithmetic flags to monitor flags */
"pushfl \n\t" /* Get mon flags */
"popl %0 \n\t"
"andl $0xfffff700, %0 \n\t" /* Erase mon arithmetic flags */
"orl %4, %0 \n\t" /* Or in guest arithmetic flags */
"pushl %0 \n\t" /* Set flags in mon */
"popfl \n\t"
"daa \n\t"
"pushfl \n\t" /* Get resultant flags */
"popl %0"
: "=r" (eflags), "=a" (ax)
: "1" (ax), "0" (eflags), "g" (arithmetic_eflags)
: "memory", "cc"
);
G_AX(vm) = ax;
SetOSZAPC(vm, eflags);
}
void
DAS(vm_t *vm)
{
Bit32u arithmetic_eflags, eflags;
Bit16u ax;
arithmetic_eflags = read_eflags(vm) & 0x000008d5;
eflags = 0; /* keep compiler quiet */
ax = G_AX(vm);
asm volatile (
/* copy guest arithmetic flags to monitor flags */
"pushfl \n\t" /* Get mon flags */
"popl %0 \n\t"
"andl $0xfffff700, %0 \n\t" /* Erase mon arithmetic flags */
"orl %4, %0 \n\t" /* Or in guest arithmetic flags */
"pushl %0 \n\t" /* Set flags in mon */
"popfl \n\t"
"das \n\t"
"pushfl \n\t" /* Get resultant flags */
"popl %0"
: "=r" (eflags), "=a" (ax)
: "1" (ax), "0" (eflags), "g" (arithmetic_eflags)
: "memory", "cc"
);
G_AX(vm) = ax;
SetOSZAPC(vm, eflags);
}
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