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ops.c
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ops.c
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/****************************************************************************
*
* Realmode X86 Emulator Library
*
* Copyright (c) 1996-1999 SciTech Software, Inc.
* Copyright (c) David Mosberger-Tang
* Copyright (c) 1999 Egbert Eich
* Copyright (c) 2007-2017 SUSE LINUX GmbH; Author: Steffen Winterfeldt
*
* ========================================================================
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of the authors not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The authors makes no
* representations about the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*
* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
* ========================================================================
*
* Description:
* Subroutines to implement the decoding and emulation of all the
* x86 processor instructions.
*
* There are approximately 250 subroutines in here, which correspond
* to the 256 byte-"opcodes" found on the 8086. The table which
* dispatches this is found in the files optab.[ch].
*
* Each opcode proc has a comment preceeding it which gives it's table
* address. Several opcodes are missing (undefined) in the table.
*
* Each proc includes information for decoding (OP_DECODE).
*
* Many of the procedures are *VERY* similar in coding. This has
* allowed for a very large amount of code to be generated in a fairly
* short amount of time (i.e. cut, paste, and modify). The result is
* that much of the code below could have been folded into subroutines
* for a large reduction in size of this file. The downside would be
* that there would be a penalty in execution speed. The file could
* also have been *MUCH* larger by inlining certain functions which
* were called. This could have resulted even faster execution. The
* prime directive I used to decide whether to inline the code or to
* modularize it, was basically: 1) no unnecessary subroutine calls,
* 2) no routines more than about 200 lines in size, and 3) modularize
* any code that I might not get right the first time. The fetch_*
* subroutines fall into the latter category. The The decode_* fall
* into the second category. The coding of the "switch(mod){ .... }"
* in many of the subroutines below falls into the first category.
* Especially, the coding of {add,and,or,sub,...}_{byte,word}
* subroutines are an especially glaring case of the third guideline.
* Since so much of the code is cloned from other modules (compare
* opcode #00 to opcode #01), making the basic operations subroutine
* calls is especially important; otherwise mistakes in coding an
* "add" would represent a nightmare in maintenance.
*
****************************************************************************/
#include "include/x86emu_int.h"
/*----------------------------- Implementation ----------------------------*/
static u8 (*op_A_byte[8])(x86emu_t *emu, u8 d, u8 s) = {
add_byte, or_byte, adc_byte, sbb_byte, and_byte, sub_byte, xor_byte, cmp_byte
};
static u16 (*op_A_word[8])(x86emu_t *emu, u16 d, u16 s) = {
add_word, or_word, adc_word, sbb_word, and_word, sub_word, xor_word, cmp_word
};
static u32 (*op_A_long[8])(x86emu_t *emu, u32 d, u32 s) = {
add_long, or_long, adc_long, sbb_long, and_long, sub_long, xor_long, cmp_long
};
static void decode_op_A(x86emu_t *emu, int type)
{
switch(type) {
case 0:
OP_DECODE("add ");
break;
case 1:
OP_DECODE("or ");
break;
case 2:
OP_DECODE("adc ");
break;
case 3:
OP_DECODE("sbb ");
break;
case 4:
OP_DECODE("and ");
break;
case 5:
OP_DECODE("sub ");
break;
case 6:
OP_DECODE("xor ");
break;
case 7:
OP_DECODE("cmp ");
break;
}
}
static u8 (*op_B_byte[8])(x86emu_t *emu, u8 d, u8 s) = {
rol_byte, ror_byte, rcl_byte, rcr_byte, shl_byte, shr_byte, shl_byte, sar_byte
};
static u16 (*op_B_word[8])(x86emu_t *emu, u16 s, u8 d) = {
rol_word, ror_word, rcl_word, rcr_word, shl_word, shr_word, shl_word, sar_word
};
static u32 (*op_B_long[8])(x86emu_t *emu, u32 s, u8 d) = {
rol_long, ror_long, rcl_long, rcr_long, shl_long, shr_long, shl_long, sar_long
};
static void decode_op_B(x86emu_t *emu, int type)
{
switch(type) {
case 0:
OP_DECODE("rol ");
break;
case 1:
OP_DECODE("ror ");
break;
case 2:
OP_DECODE("rcl ");
break;
case 3:
OP_DECODE("rcr ");
break;
case 4:
OP_DECODE("shl ");
break;
case 5:
OP_DECODE("shr ");
break;
case 6:
OP_DECODE("sal ");
break;
case 7:
OP_DECODE("sar ");
break;
}
}
void decode_cond(x86emu_t *emu, int type)
{
switch(type) {
case 0:
OP_DECODE("o ");
break;
case 1:
OP_DECODE("no ");
break;
case 2:
OP_DECODE("b ");
break;
case 3:
OP_DECODE("nb ");
break;
case 4:
OP_DECODE("z ");
break;
case 5:
OP_DECODE("nz ");
break;
case 6:
OP_DECODE("na ");
break;
case 7:
OP_DECODE("a ");
break;
case 8:
OP_DECODE("s ");
break;
case 9:
OP_DECODE("ns ");
break;
case 10:
OP_DECODE("p ");
break;
case 11:
OP_DECODE("np ");
break;
case 12:
OP_DECODE("l ");
break;
case 13:
OP_DECODE("nl ");
break;
case 14:
OP_DECODE("ng ");
break;
case 15:
OP_DECODE("g ");
break;
}
}
/****************************************************************************
PARAMETERS:
op1 - Instruction op code
REMARKS:
Handles illegal opcodes.
****************************************************************************/
static void x86emuOp_illegal_op(x86emu_t *emu, u8 op1)
{
OP_DECODE("illegal opcode");
INTR_RAISE_UD(emu);
}
/****************************************************************************
REMARKS:
Handles opcode 0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38
****************************************************************************/
static void x86emuOp_op_A_byte_RM_R(x86emu_t *emu, u8 op1)
{
int mod, rl, rh, type;
u8 *src, *dst, val;
u32 addr;
type = op1 >> 3;
decode_op_A(emu, type);
fetch_decode_modrm(emu, &mod, &rh, &rl);
if(mod == 3) {
dst = decode_rm_byte_register(emu, rl);
OP_DECODE(",");
src = decode_rm_byte_register(emu, rh);
*dst = (*op_A_byte[type])(emu, *dst, *src);
}
else {
addr = decode_rm_address(emu, mod, rl);
OP_DECODE(",");
val = fetch_data_byte(emu, addr);
src = decode_rm_byte_register(emu, rh);
val = (*op_A_byte[type])(emu, val, *src);
if(type != 7) store_data_byte(emu, addr, val);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x01, 0x09, 0x11, 0x19, 0x21, 0x29, 0x31, 0x39
****************************************************************************/
static void x86emuOp_op_A_word_RM_R(x86emu_t *emu, u8 op1)
{
int mod, rl, rh, type;
u32 *src32, *dst32, val, addr;
u16 *src16, *dst16;
type = op1 >> 3;
decode_op_A(emu, type);
fetch_decode_modrm(emu, &mod, &rh, &rl);
if(mod == 3) {
if(MODE_DATA32) {
dst32 = decode_rm_long_register(emu, rl);
OP_DECODE(",");
src32 = decode_rm_long_register(emu, rh);
*dst32 = (*op_A_long[type])(emu, *dst32, *src32);
}
else {
dst16 = decode_rm_word_register(emu, rl);
OP_DECODE(",");
src16 = decode_rm_word_register(emu, rh);
*dst16 = (*op_A_word[type])(emu, *dst16, *src16);
}
}
else {
addr = decode_rm_address(emu, mod, rl);
OP_DECODE(",");
if(MODE_DATA32) {
val = fetch_data_long(emu, addr);
src32 = decode_rm_long_register(emu, rh);
val = (*op_A_long[type])(emu, val, *src32);
if(type != 7) store_data_long(emu, addr, val);
}
else {
val = fetch_data_word(emu, addr);
src16 = decode_rm_word_register(emu, rh);
val = (*op_A_word[type])(emu, val, *src16);
if(type != 7) store_data_word(emu, addr, val);
}
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x02, 0x0a, 0x12, 0x1a, 0x22, 0x2a, 0x32, 0x3a
****************************************************************************/
static void x86emuOp_op_A_byte_R_RM(x86emu_t *emu, u8 op1)
{
int mod, rl, rh, type;
u8 *src, *dst, val;
u32 addr;
type = op1 >> 3;
decode_op_A(emu, type);
fetch_decode_modrm(emu, &mod, &rh, &rl);
if(mod == 3) {
dst = decode_rm_byte_register(emu, rh);
OP_DECODE(",");
src = decode_rm_byte_register(emu, rl);
*dst = (*op_A_byte[type])(emu, *dst, *src);
}
else {
dst = decode_rm_byte_register(emu, rh);
OP_DECODE(",");
addr = decode_rm_address(emu, mod, rl);
val = fetch_data_byte(emu, addr);
*dst = (*op_A_byte[type])(emu, *dst, val);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x03, 0x0b, 0x13, 0x1b, 0x23, 0x2b, 0x33, 0x3b
****************************************************************************/
static void x86emuOp_op_A_word_R_RM(x86emu_t *emu, u8 op1)
{
int mod, rl, rh, type;
u32 *src32, *dst32, val, addr;
u16 *src16, *dst16;
type = op1 >> 3;
decode_op_A(emu, type);
fetch_decode_modrm(emu, &mod, &rh, &rl);
if(mod == 3) {
if(MODE_DATA32) {
dst32 = decode_rm_long_register(emu, rh);
OP_DECODE(",");
src32 = decode_rm_long_register(emu, rl);
*dst32 = (*op_A_long[type])(emu, *dst32, *src32);
}
else {
dst16 = decode_rm_word_register(emu, rh);
OP_DECODE(",");
src16 = decode_rm_word_register(emu, rl);
*dst16 = (*op_A_word[type])(emu, *dst16, *src16);
}
}
else {
if(MODE_DATA32) {
dst32 = decode_rm_long_register(emu, rh);
OP_DECODE(",");
addr = decode_rm_address(emu, mod, rl);
val = fetch_data_long(emu, addr);
*dst32 = (*op_A_long[type])(emu, *dst32, val);
}
else {
dst16 = decode_rm_word_register(emu, rh);
OP_DECODE(",");
addr = decode_rm_address(emu, mod, rl);
val = fetch_data_word(emu, addr);
*dst16 = (*op_A_word[type])(emu, *dst16, val);
}
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x04, 0x0c, 0x14, 0x1c, 0x24, 0x2c, 0x34, 0x3c
****************************************************************************/
static void x86emuOp_op_A_byte_AL_IMM(x86emu_t *emu, u8 op1)
{
int type;
u8 val;
type = op1 >> 3;
decode_op_A(emu, type);
OP_DECODE("al,");
val = fetch_byte(emu);
DECODE_HEX2(val);
emu->x86.R_AL = (*op_A_byte[type])(emu, emu->x86.R_AL, val);
}
/****************************************************************************
REMARKS:
Handles opcode 0x05, 0x0d, 0x15, 0x1d, 0x25, 0x2d, 0x35, 0x3d
****************************************************************************/
static void x86emuOp_op_A_word_AX_IMM(x86emu_t *emu, u8 op1)
{
int type;
u32 val;
type = op1 >> 3;
decode_op_A(emu, type);
if(MODE_DATA32) {
OP_DECODE("eax,");
val = fetch_long(emu);
DECODE_HEX8(val);
emu->x86.R_EAX = (*op_A_long[type])(emu, emu->x86.R_EAX, val);
}
else {
OP_DECODE("ax,");
val = fetch_word(emu);
DECODE_HEX4(val);
emu->x86.R_AX = (*op_A_word[type])(emu, emu->x86.R_AX, val);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x06
****************************************************************************/
static void x86emuOp_push_ES(x86emu_t *emu, u8 op1)
{
OP_DECODE("push es");
if(MODE_DATA32) {
push_long(emu, emu->x86.R_ES);
}
else {
push_word(emu, emu->x86.R_ES);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x07
****************************************************************************/
static void x86emuOp_pop_ES(x86emu_t *emu, u8 op1)
{
OP_DECODE("pop es");
x86emu_set_seg_register(emu, emu->x86.R_ES_SEL, MODE_DATA32 ? pop_long(emu) : pop_word(emu));
}
/****************************************************************************
REMARKS:
Handles opcode 0x0e
****************************************************************************/
static void x86emuOp_push_CS(x86emu_t *emu, u8 op1)
{
OP_DECODE("push cs");
if(MODE_DATA32) {
push_long(emu, emu->x86.R_CS);
}
else {
push_word(emu, emu->x86.R_CS);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x0f. Escape for two-byte opcode (286 or better)
****************************************************************************/
static void x86emuOp_two_byte(x86emu_t *emu, u8 op1)
{
u8 op2 = fetch_byte(emu);
(*x86emu_optab2[op2])(emu, op2);
}
/****************************************************************************
REMARKS:
Handles opcode 0x16
****************************************************************************/
static void x86emuOp_push_SS(x86emu_t *emu, u8 op1)
{
OP_DECODE("push ss");
if(MODE_DATA32) {
push_long(emu, emu->x86.R_SS);
}
else {
push_word(emu, emu->x86.R_SS);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x17
****************************************************************************/
static void x86emuOp_pop_SS(x86emu_t *emu, u8 op1)
{
OP_DECODE("pop ss");
x86emu_set_seg_register(emu, emu->x86.R_SS_SEL, MODE_DATA32 ? pop_long(emu) : pop_word(emu));
}
/****************************************************************************
REMARKS:
Handles opcode 0x1e
****************************************************************************/
static void x86emuOp_push_DS(x86emu_t *emu, u8 op1)
{
OP_DECODE("push ds");
if(MODE_DATA32) {
push_long(emu, emu->x86.R_DS);
}
else {
push_word(emu, emu->x86.R_DS);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x1f
****************************************************************************/
static void x86emuOp_pop_DS(x86emu_t *emu, u8 op1)
{
OP_DECODE("pop ds");
x86emu_set_seg_register(emu, emu->x86.R_DS_SEL, MODE_DATA32 ? pop_long(emu) : pop_word(emu));
}
/****************************************************************************
REMARKS:
Handles opcode 0x27
****************************************************************************/
static void x86emuOp_daa(x86emu_t *emu, u8 op1)
{
OP_DECODE("daa");
emu->x86.R_AL = daa_byte(emu, emu->x86.R_AL);
}
/****************************************************************************
REMARKS:
Handles opcode 0x2f
****************************************************************************/
static void x86emuOp_das(x86emu_t *emu, u8 op1)
{
OP_DECODE("das");
emu->x86.R_AL = das_byte(emu, emu->x86.R_AL);
}
/****************************************************************************
REMARKS:
Handles opcode 0x37
****************************************************************************/
static void x86emuOp_aaa(x86emu_t *emu, u8 op1)
{
OP_DECODE("aaa");
emu->x86.R_AX = aaa_word(emu, emu->x86.R_AX);
}
/****************************************************************************
REMARKS:
Handles opcode 0x3f
****************************************************************************/
static void x86emuOp_aas(x86emu_t *emu, u8 op1)
{
OP_DECODE("aas");
emu->x86.R_AX = aas_word(emu, emu->x86.R_AX);
}
/****************************************************************************
REMARKS:
Handles opcode 0x40
****************************************************************************/
static void x86emuOp_inc_AX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc eax");
emu->x86.R_EAX = inc_long(emu, emu->x86.R_EAX);
}
else {
OP_DECODE("inc ax");
emu->x86.R_AX = inc_word(emu, emu->x86.R_AX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x41
****************************************************************************/
static void x86emuOp_inc_CX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc ecx");
emu->x86.R_ECX = inc_long(emu, emu->x86.R_ECX);
}
else {
OP_DECODE("inc cx");
emu->x86.R_CX = inc_word(emu, emu->x86.R_CX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x42
****************************************************************************/
static void x86emuOp_inc_DX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc edx");
emu->x86.R_EDX = inc_long(emu, emu->x86.R_EDX);
}
else {
OP_DECODE("inc dx");
emu->x86.R_DX = inc_word(emu, emu->x86.R_DX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x43
****************************************************************************/
static void x86emuOp_inc_BX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc ebx");
emu->x86.R_EBX = inc_long(emu, emu->x86.R_EBX);
}
else {
OP_DECODE("inc bx");
emu->x86.R_BX = inc_word(emu, emu->x86.R_BX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x44
****************************************************************************/
static void x86emuOp_inc_SP(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc esp");
emu->x86.R_ESP = inc_long(emu, emu->x86.R_ESP);
}
else {
OP_DECODE("inc sp");
emu->x86.R_SP = inc_word(emu, emu->x86.R_SP);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x45
****************************************************************************/
static void x86emuOp_inc_BP(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc ebp");
emu->x86.R_EBP = inc_long(emu, emu->x86.R_EBP);
}
else {
OP_DECODE("inc bp");
emu->x86.R_BP = inc_word(emu, emu->x86.R_BP);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x46
****************************************************************************/
static void x86emuOp_inc_SI(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc esi");
emu->x86.R_ESI = inc_long(emu, emu->x86.R_ESI);
}
else {
OP_DECODE("inc si");
emu->x86.R_SI = inc_word(emu, emu->x86.R_SI);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x47
****************************************************************************/
static void x86emuOp_inc_DI(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("inc edi");
emu->x86.R_EDI = inc_long(emu, emu->x86.R_EDI);
}
else {
OP_DECODE("inc di");
emu->x86.R_DI = inc_word(emu, emu->x86.R_DI);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x48
****************************************************************************/
static void x86emuOp_dec_AX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec eax");
emu->x86.R_EAX = dec_long(emu, emu->x86.R_EAX);
}
else {
OP_DECODE("dec ax");
emu->x86.R_AX = dec_word(emu, emu->x86.R_AX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x49
****************************************************************************/
static void x86emuOp_dec_CX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec ecx");
emu->x86.R_ECX = dec_long(emu, emu->x86.R_ECX);
}
else {
OP_DECODE("dec cx");
emu->x86.R_CX = dec_word(emu, emu->x86.R_CX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x4a
****************************************************************************/
static void x86emuOp_dec_DX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec edx");
emu->x86.R_EDX = dec_long(emu, emu->x86.R_EDX);
}
else {
OP_DECODE("dec dx");
emu->x86.R_DX = dec_word(emu, emu->x86.R_DX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x4b
****************************************************************************/
static void x86emuOp_dec_BX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec ebx");
emu->x86.R_EBX = dec_long(emu, emu->x86.R_EBX);
}
else {
OP_DECODE("dec bx");
emu->x86.R_BX = dec_word(emu, emu->x86.R_BX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x4c
****************************************************************************/
static void x86emuOp_dec_SP(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec esp");
emu->x86.R_ESP = dec_long(emu, emu->x86.R_ESP);
}
else {
OP_DECODE("dec sp");
emu->x86.R_SP = dec_word(emu, emu->x86.R_SP);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x4d
****************************************************************************/
static void x86emuOp_dec_BP(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec ebp");
emu->x86.R_EBP = dec_long(emu, emu->x86.R_EBP);
}
else {
OP_DECODE("dec bp");
emu->x86.R_BP = dec_word(emu, emu->x86.R_BP);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x4e
****************************************************************************/
static void x86emuOp_dec_SI(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec esi");
emu->x86.R_ESI = dec_long(emu, emu->x86.R_ESI);
}
else {
OP_DECODE("dec si");
emu->x86.R_SI = dec_word(emu, emu->x86.R_SI);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x4f
****************************************************************************/
static void x86emuOp_dec_DI(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("dec edi");
emu->x86.R_EDI = dec_long(emu, emu->x86.R_EDI);
}
else {
OP_DECODE("dec di");
emu->x86.R_DI = dec_word(emu, emu->x86.R_DI);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x50
****************************************************************************/
static void x86emuOp_push_AX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push eax");
push_long(emu, emu->x86.R_EAX);
}
else {
OP_DECODE("push ax");
push_word(emu, emu->x86.R_AX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x51
****************************************************************************/
static void x86emuOp_push_CX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push ecx");
push_long(emu, emu->x86.R_ECX);
}
else {
OP_DECODE("push cx");
push_word(emu, emu->x86.R_CX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x52
****************************************************************************/
static void x86emuOp_push_DX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push edx");
push_long(emu, emu->x86.R_EDX);
}
else {
OP_DECODE("push dx");
push_word(emu, emu->x86.R_DX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x53
****************************************************************************/
static void x86emuOp_push_BX(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push ebx");
push_long(emu, emu->x86.R_EBX);
}
else {
OP_DECODE("push bx");
push_word(emu, emu->x86.R_BX);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x54
****************************************************************************/
static void x86emuOp_push_SP(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push esp");
push_long(emu, emu->x86.R_ESP);
}
else {
OP_DECODE("push sp");
push_word(emu, emu->x86.R_SP);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x55
****************************************************************************/
static void x86emuOp_push_BP(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push ebp");
push_long(emu, emu->x86.R_EBP);
}
else {
OP_DECODE("push bp");
push_word(emu, emu->x86.R_BP);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x56
****************************************************************************/
static void x86emuOp_push_SI(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push esi");
push_long(emu, emu->x86.R_ESI);
}
else {
OP_DECODE("push si");
push_word(emu, emu->x86.R_SI);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x57
****************************************************************************/
static void x86emuOp_push_DI(x86emu_t *emu, u8 op1)
{
if(MODE_DATA32) {
OP_DECODE("push edi");
push_long(emu, emu->x86.R_EDI);
}
else {
OP_DECODE("push di");
push_word(emu, emu->x86.R_DI);
}
}
/****************************************************************************
REMARKS:
Handles opcode 0x58
****************************************************************************/
static void x86emuOp_pop_AX(x86emu_t *emu, u8 op1)
{