cfe/x86emu/ops.c

15 *  supporting documentation, and that the name of the authors not be used
16 *  in advertising or publicity pertaining to distribution of the software
18 *  representations about the suitability of this software for any purpose.
36 *               and emulation of all the x86 processor instructions.
49 * Many of the procedures are *VERY* similar in coding.  This has
50 * allowed for a very large amount of code to be generated in a fairly
51 * short amount of time (i.e. cut, paste, and modify).  The result is
52 * that much of the code below could have been folded into subroutines
53 * for a large reduction in size of this file.  The downside would be
62 * into the second category.  The coding of the "switch(mod){ .... }"
63 * in many of the subroutines below falls into the first category.
64 * Especially, the coding of {add,and,or,sub,...}_{byte,word}
65 * subroutines are an especially glaring case of the third guideline.
66 * Since so much of the code is cloned from other modules (compare
2185      * note the lack of DECODE_CLEAR_SEGOVR(r) since, here is one of 4
3911 	 * what type of processor is in the system.
4254      * note the lack of DECODE_CLEAR_SEGOVR(r) since, here is one of 4
4271      * note the lack of DECODE_CLEAR_SEGOVR(r) since, here is one of 4
5082     int sf, of;
5092     of = ACCESS_FLAG(F_OF) != 0;
5093     if (sf ^ of)
5107     int sf, of;
5117     of = ACCESS_FLAG(F_OF) != 0;
5118     /* note: inverse of above, but using == instead of xor. */
5119     if (sf == of)
5133     int sf, of;
5144     of = ACCESS_FLAG(F_OF) != 0;
5145     if ((sf ^ of) || ACCESS_FLAG(F_ZF))
5159     int sf, of;
5170     of = ACCESS_FLAG(F_OF) != 0;
5171     if ((sf == of) && !ACCESS_FLAG(F_ZF))
5202      * Weirdo special case instruction format.  Part of the opcode
5331      * Weirdo special case instruction format.  Part of the opcode
5521      * Weirdo special case instruction format.  Part of the opcode
5646      * Weirdo special case instruction format.  Part of the opcode
7134     /* clear the lower bits of the flag register */
8169      * Yet another weirdo special case instruction format.  Part of
8293      * Yet another weirdo special case instruction format.  Part of
8930      * Yet another weirdo special case instruction format.  Part of
9022      * Yet another weirdo special case instruction format.  Part of
9173      * Yet another weirdo special case instruction format.  Part of
9267      * Yet another weirdo special case instruction format.  Part of
9873        of 32 cases.  */
10155        of 32 cases.  */