contrib/x86emu/x86emu.c

19  *  supporting documentation, and that the name of the authors not be used
20  *  in advertising or publicity pertaining to distribution of the software
22  *  representations about the suitability of this software for any purpose.
209  * Raise the specified interrupt to be handled before the execution of the
291  * Raise the specified interrupt to be handled before the execution of the
369  * Value of the default data segment
378  * decodings of addressing modes would have to set/clear a bit describing
379  * whether the access is relative to DS or SS.  That is the function of the
392  * 	ds/ss select (in absense of override)
394  * Each of the above 7 items are handled with a bit in the mode field.
628  * Return a pointer to the register given by the R/RM field of the
629  * modrm byte, for byte operands. Also enables the decoding of instructions.
676  * Return a pointer to the register given by the R/RM field of the
677  * modrm byte, for word operands.  Also enables the decoding of instructions.
724  * Return a pointer to the register given by the R/RM field of the
725  * modrm byte, for dword operands.  Also enables the decoding of instructions.
773  * Return a pointer to the register given by the R/RM field of the
775  * special case of segreg operands.  Also enables the decoding of instructions.
878  * Also enables the decoding of instructions.
1691 	int sf, of;
1694 	of = ACCESS_FLAG(F_OF) != 0;
1696 	common_jmp_near(emu, sf != of);
1706 	int sf, of;
1709 	of = ACCESS_FLAG(F_OF) != 0;
1711 	common_jmp_near(emu, sf == of);
1721 	int sf, of;
1724 	of = ACCESS_FLAG(F_OF) != 0;
1726 	common_jmp_near(emu, sf != of || ACCESS_FLAG(F_ZF));
1736 	int sf, of;
1739 	of = ACCESS_FLAG(F_OF) != 0;
1741 	common_jmp_near(emu, sf == of && !ACCESS_FLAG(F_ZF));
1767          * Weirdo special case instruction format.  Part of the opcode
1817          * Weirdo special case instruction format.  Part of the opcode
1835          * Weirdo special case instruction format.  Part of the opcode
1880          * Weirdo special case instruction format.  Part of the opcode
2483 	/* clear the lower bits of the flag register */
3152          * Yet another weirdo special case instruction format.  Part of
3201          * Yet another weirdo special case instruction format.  Part of
3893 	/* long, drawn out code follows.  Double switch for a total of 32
3938 	/* long, drawn out code follows.  Double switch for a total of 32
3987 	/* long, drawn out code follows.  Double switch for a total of 32
5893  * apparently required to emulate the setting of the OF and AF flag.
5895  * flag is the XOR of the top two bits of the carry chain for an
5900  * So, given the following table, which represents the addition of two
5913  * Construction of table for cout:
5923  * That represents alot of operations, but NO CHOICE....
5927  * The following table represents the subtraction of two bits, from
5940  * Construction of table for cout:
6719 	 * The new rotate is done mod 9, and given this, for a rotation of n
6758 		/* OVERFLOW is set *IFF* cnt==1, then it is the xor of CF and
6837 	 * The new rotate is done mod 9, and given this, for a rotation of n
6857 			 * 0..1 in any representation of the flags register
6886 		/* OVERFLOW is set *IFF* cnt==1, then it is the xor of CF and
6995 		/* OVERFLOW is set *IFF* s==1, then it is the xor of CF and
7003 		 * of the result!!!                               */
7029 		 * of the result!!!                               */
7055 		 * of the result!!!                               */
7091 		/* OVERFLOW is set *IFF* s==1, then it is the xor of the two
7097 		 * of the result!!!                               */
7121 		 * of the result!!!                               */
7145 		 * of the result!!!                               */