コード例 #1
0
ファイル: bcd.cpp プロジェクト: iver6/BA
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::AAS(bxInstruction_c *i)
{
  int tmpCF = 0, tmpAF = 0;

  /* AAS affects the following flags: A,C */

  if (((AL & 0x0F) > 0x09) || get_AF())
  {
    AX = AX - 0x106;
    tmpAF = tmpCF = 1;
  }

  AL = AL & 0x0f;

  /* AAS affects also the following flags: Z,S,O,P */
  /* modification of the flags is undocumented */

  /* The following behaviour seems to match the P6 and
     its derived processors. */
  SET_FLAGS_OSZAPC_LOGIC_8(AL);
  set_CF(tmpCF);
  set_AF(tmpAF);

  BX_NEXT_INSTR(i);
}
コード例 #2
0
ファイル: bcd.cpp プロジェクト: iver6/BA
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DAS(bxInstruction_c *i)
{
  /* The algorithm for DAS is fashioned after the pseudo code in the
   * Pentium Processor Family Developer's Manual, volume 3.  It seems
   * to have changed from earlier processor's manuals.  I'm not sure
   * if this is a correction in the algorithm printed, or Intel has
   * changed the handling of instruction. Validated against Intel
   * Pentium family hardware.
   */

  Bit8u tmpAL = AL;
  int tmpCF = 0, tmpAF = 0;

  /* DAS effect the following flags: A,C,S,Z,P */

  if (((tmpAL & 0x0F) > 0x09) || get_AF())
  {
    tmpCF = (AL < 0x06) || get_CF();
    AL = AL - 0x06;
    tmpAF = 1;
  }

  if ((tmpAL > 0x99) || get_CF())
  {
    AL = AL - 0x60;
    tmpCF = 1;
  }

  SET_FLAGS_OSZAPC_LOGIC_8(AL);
  set_CF(tmpCF);
  set_AF(tmpAF);

  BX_NEXT_INSTR(i);
}
コード例 #3
0
ファイル: bcd.cpp プロジェクト: iver6/BA
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DAA(bxInstruction_c *i)
{
  Bit8u tmpAL = AL;
  int   tmpCF = 0, tmpAF = 0;

  /* Validated against Intel Pentium family hardware. */

  // DAA affects the following flags: S,Z,A,P,C

  if (((tmpAL & 0x0F) > 0x09) || get_AF())
  {
    tmpCF = ((AL > 0xF9) || get_CF());
    AL = AL + 0x06;
    tmpAF = 1;
  }

  if ((tmpAL > 0x99) || get_CF())
  {
    AL = AL + 0x60;
    tmpCF = 1;
  }

  SET_FLAGS_OSZAPC_LOGIC_8(AL);
  set_CF(tmpCF);
  set_AF(tmpAF);

  BX_NEXT_INSTR(i);
}
コード例 #4
0
ファイル: flags.cpp プロジェクト: dborth/dosbox-wii
Bitu FillFlags(void) {
//	if (lflags.type==t_UNKNOWN) return reg_flags;
	Bitu new_word=(reg_flags & ~FLAG_MASK);
	if (get_CF()) new_word|=FLAG_CF;
	if (get_PF()) new_word|=FLAG_PF;
	if (get_AF()) new_word|=FLAG_AF;
	if (get_ZF()) new_word|=FLAG_ZF;
	if (get_SF()) new_word|=FLAG_SF;
	if (get_OF()) new_word|=FLAG_OF;
	reg_flags=new_word;
	lflags.type=t_UNKNOWN;
	return reg_flags;
}
コード例 #5
0
ファイル: bcd.cpp プロジェクト: iver6/BA
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::AAA(bxInstruction_c *i)
{
  int tmpCF = 0, tmpAF = 0;

  /*
   *  Note: This instruction incorrectly documented in Intel's materials.
   *        The right description is:
   *
   *    IF (((AL and 0FH) > 9) or (AF==1)
   *    THEN
   *        IF CPU<286 THEN {  AL <- AL+6 }
   *                   ELSE {  AX <- AX+6 }
   *        AH <- AH+1
   *        CF <- 1
   *        AF <- 1
   *    ELSE
   *        CF <- 0
   *        AF <- 0
   *    ENDIF
   *	AL <- AL and 0Fh
   */	

  /* Validated against Intel Pentium family hardware. */

  /* AAA affects the following flags: A,C */

  if (((AL & 0x0f) > 9) || get_AF())
  {
    AX = AX + 0x106;
    tmpAF = tmpCF = 1;
  }

  AL = AL & 0x0f;

  /* AAA affects also the following flags: Z,S,O,P */
  /* modification of the flags is undocumented */

  /* The following behaviour seems to match the P6 and
     its derived processors. */
  SET_FLAGS_OSZAPC_LOGIC_8(AL);
  set_CF(tmpCF);
  set_AF(tmpAF);

  BX_NEXT_INSTR(i);
}