ops2.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
*
*  ========================================================================
*
*  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.
*
*  ========================================================================
*
* Language:		ANSI C
* Environment:	Any
* Developer:    Kendall Bennett
*
* Description:  This file includes subroutines to implement the decoding
*               and emulation of all the x86 extended two-byte processor
*               instructions.
*
****************************************************************************/

#include "x86emu/x86emui.h"

/*----------------------------- Implementation ----------------------------*/

/****************************************************************************
PARAMETERS:
op1 - Instruction op code

REMARKS:
Handles illegal opcodes.
****************************************************************************/
void x86emuOp2_illegal_op(
	u8 op2)
{
	START_OF_INSTR();
	DECODE_PRINTF("ILLEGAL EXTENDED X86 OPCODE\n");
	TRACE_REGS();
	printk("%04x:%04x: %02X ILLEGAL EXTENDED X86 OPCODE!\n",
		M.x86.R_CS, M.x86.R_IP-2,op2);
    HALT_SYS();
    END_OF_INSTR();
}

#define xorl(a,b)   ((a) && !(b)) || (!(a) && (b))

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0x80-0x8F
****************************************************************************/
void x86emuOp2_long_jump(u8 op2)
{
    s32 target;
    char *name = 0;
    int cond = 0;

    /* conditional jump to word offset. */
    START_OF_INSTR();
    switch (op2) {
      case 0x80:
	name = "JO\t";
	cond =  ACCESS_FLAG(F_OF);
	break;
      case 0x81:
	name = "JNO\t";
	cond = !ACCESS_FLAG(F_OF);
	break;
      case 0x82:
	name = "JB\t";
	cond = ACCESS_FLAG(F_CF);
	break;
      case 0x83:
	name = "JNB\t";
	cond = !ACCESS_FLAG(F_CF);
	break;
      case 0x84:
	name = "JZ\t";
	cond = ACCESS_FLAG(F_ZF);
	break;
      case 0x85:
	name = "JNZ\t";
	cond = !ACCESS_FLAG(F_ZF);
	break;
      case 0x86:
	name = "JBE\t";
	cond = ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF);
	break;
      case 0x87:
	name = "JNBE\t";
	cond = !(ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF));
	break;
      case 0x88:
	name = "JS\t";
	cond = ACCESS_FLAG(F_SF);
	break;
      case 0x89:
	name = "JNS\t";
	cond = !ACCESS_FLAG(F_SF);
	break;
      case 0x8a:
	name = "JP\t";
	cond = ACCESS_FLAG(F_PF);
	break;
      case 0x8b:
	name = "JNP\t";
	cond = !ACCESS_FLAG(F_PF);
	break;
      case 0x8c:
	name = "JL\t";
	cond = xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF));
	break;
      case 0x8d:
	name = "JNL\t";
	cond = xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF));
	break;
      case 0x8e:
	name = "JLE\t";
	cond = (xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) ||
		ACCESS_FLAG(F_ZF));
	break;
      case 0x8f:
	name = "JNLE\t";
	cond = !(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) ||
		 ACCESS_FLAG(F_ZF));
	break;
    }
    DECODE_PRINTF(name);
    target = (s16) fetch_word_imm();
    target += (s16) M.x86.R_IP;
    DECODE_PRINTF2("%04x\n", target);
    TRACE_AND_STEP();
    if (cond)
	M.x86.R_IP = (u16)target;
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0x90-0x9F
****************************************************************************/
void x86emuOp2_set_byte(u8 op2)
{
    int mod, rl, rh;
    uint destoffset;
    u8  *destreg;
    char *name = 0;
    int cond = 0;

    START_OF_INSTR();
    switch (op2) {
      case 0x90:
	name = "SETO\t";
	cond =  ACCESS_FLAG(F_OF);
	break;
      case 0x91:
	name = "SETNO\t";
	cond = !ACCESS_FLAG(F_OF);
	break;
      case 0x92:
	name = "SETB\t";
	cond = ACCESS_FLAG(F_CF);
	break;
      case 0x93:
	name = "SETNB\t";
	cond = !ACCESS_FLAG(F_CF);
	break;
      case 0x94:
	name = "SETZ\t";
	cond = ACCESS_FLAG(F_ZF);
	break;
      case 0x95:
	name = "SETNZ\t";
	cond = !ACCESS_FLAG(F_ZF);
	break;
      case 0x96:
	name = "SETBE\t";
	cond = ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF);
	break;
      case 0x97:
	name = "SETNBE\t";
	cond = !(ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF));
	break;
      case 0x98:
	name = "SETS\t";
	cond = ACCESS_FLAG(F_SF);
	break;
      case 0x99:
	name = "SETNS\t";
	cond = !ACCESS_FLAG(F_SF);
	break;
      case 0x9a:
	name = "SETP\t";
	cond = ACCESS_FLAG(F_PF);
	break;
      case 0x9b:
	name = "SETNP\t";
	cond = !ACCESS_FLAG(F_PF);
	break;
      case 0x9c:
	name = "SETL\t";
	cond = xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF));
	break;
      case 0x9d:
	name = "SETNL\t";
	cond = xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF));
	break;
      case 0x9e:
	name = "SETLE\t";
	cond = (xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) ||
		ACCESS_FLAG(F_ZF));
	break;
      case 0x9f:
	name = "SETNLE\t";
	cond = !(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) ||
		 ACCESS_FLAG(F_ZF));
	break;
    }
    DECODE_PRINTF(name);
    FETCH_DECODE_MODRM(mod, rh, rl);
    switch (mod) {
    case 0:
	destoffset = decode_rm00_address(rl);
	TRACE_AND_STEP();
	store_data_byte(destoffset, cond ? 0x01 : 0x00);
	break;
    case 1:
	destoffset = decode_rm01_address(rl);
	TRACE_AND_STEP();
	store_data_byte(destoffset, cond ? 0x01 : 0x00);
	break;
    case 2:
	destoffset = decode_rm10_address(rl);
	TRACE_AND_STEP();
	store_data_byte(destoffset, cond ? 0x01 : 0x00);
	break;
    case 3:                     /* register to register */
	destreg = DECODE_RM_BYTE_REGISTER(rl);
	TRACE_AND_STEP();
	*destreg = cond ? 0x01 : 0x00;
	break;
    }
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xa0
****************************************************************************/
void x86emuOp2_push_FS(u8 X86EMU_UNUSED(op2))
{
    START_OF_INSTR();
    DECODE_PRINTF("PUSH\tFS\n");
    TRACE_AND_STEP();
    push_word(M.x86.R_FS);
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xa1
****************************************************************************/
void x86emuOp2_pop_FS(u8 X86EMU_UNUSED(op2))
{
    START_OF_INSTR();
    DECODE_PRINTF("POP\tFS\n");
    TRACE_AND_STEP();
    M.x86.R_FS = pop_word();
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xa3
****************************************************************************/
void x86emuOp2_bt_R(u8 X86EMU_UNUSED(op2))
{
    int mod, rl, rh;
    uint srcoffset;
    int bit,disp;

    START_OF_INSTR();
    DECODE_PRINTF("BT\t");
    FETCH_DECODE_MODRM(mod, rh, rl);
    switch (mod) {
    case 0:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval;
	    u32 *shiftreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    disp = (s16)*shiftreg >> 5;
	    srcval = fetch_data_long(srcoffset+disp);
	    CONDITIONAL_SET_FLAG(srcval & (0x1 << bit),F_CF);
	} else {
	    u16 srcval;
	    u16 *shiftreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0xF;
	    disp = (s16)*shiftreg >> 4;
	    srcval = fetch_data_word(srcoffset+disp);
	    CONDITIONAL_SET_FLAG(srcval & (0x1 << bit),F_CF);
	}
	break;
    case 1:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval;
	    u32 *shiftreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    disp = (s16)*shiftreg >> 5;
	    srcval = fetch_data_long(srcoffset+disp);
	    CONDITIONAL_SET_FLAG(srcval & (0x1 << bit),F_CF);
	} else {
	    u16 srcval;
	    u16 *shiftreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0xF;
	    disp = (s16)*shiftreg >> 4;
	    srcval = fetch_data_word(srcoffset+disp);
	    CONDITIONAL_SET_FLAG(srcval & (0x1 << bit),F_CF);
	}
	break;
    case 2:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval;
	    u32 *shiftreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    disp = (s16)*shiftreg >> 5;
	    srcval = fetch_data_long(srcoffset+disp);
	    CONDITIONAL_SET_FLAG(srcval & (0x1 << bit),F_CF);
	} else {
	    u16 srcval;
	    u16 *shiftreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0xF;
	    disp = (s16)*shiftreg >> 4;
	    srcval = fetch_data_word(srcoffset+disp);
	    CONDITIONAL_SET_FLAG(srcval & (0x1 << bit),F_CF);
	}
	break;
    case 3:                     /* register to register */
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 *srcreg,*shiftreg;

	    srcreg = DECODE_RM_LONG_REGISTER(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    CONDITIONAL_SET_FLAG(*srcreg & (0x1 << bit),F_CF);
	} else {
	    u16 *srcreg,*shiftreg;

	    srcreg = DECODE_RM_WORD_REGISTER(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0xF;
	    CONDITIONAL_SET_FLAG(*srcreg & (0x1 << bit),F_CF);
	}
	break;
    }
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xa4
****************************************************************************/
void x86emuOp2_shld_IMM(u8 X86EMU_UNUSED(op2))
{
    int mod, rl, rh;
    uint destoffset;
	u8 shift;

    START_OF_INSTR();
    DECODE_PRINTF("SHLD\t");
    FETCH_DECODE_MODRM(mod, rh, rl);
    switch (mod) {
    case 0:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 destval;
	    u32 *shiftreg;

	    destoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    DECODE_PRINTF(",");
	    shift = fetch_byte_imm();
	    DECODE_PRINTF2("%d\n", shift);
	    TRACE_AND_STEP();
	    destval = fetch_data_long(destoffset);
	    destval = shld_long(destval,*shiftreg,shift);
	    store_data_long(destoffset, destval);
	} else {
	    u16 destval;
	    u16 *shiftreg;

	    destoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    DECODE_PRINTF(",");
	    shift = fetch_byte_imm();
	    DECODE_PRINTF2("%d\n", shift);
	    TRACE_AND_STEP();
	    destval = fetch_data_word(destoffset);
	    destval = shld_word(destval,*shiftreg,shift);
	    store_data_word(destoffset, destval);
	}
	break;
    case 1:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 destval;
	    u32 *shiftreg;

	    destoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    DECODE_PRINTF(",");
	    shift = fetch_byte_imm();
	    DECODE_PRINTF2("%d\n", shift);
	    TRACE_AND_STEP();
	    destval = fetch_data_long(destoffset);
	    destval = shld_long(destval,*shiftreg,shift);
	    store_data_long(destoffset, destval);
	} else {
	    u16 destval;
	    u16 *shiftreg;

	    destoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
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