--- np2/i286a/i286a_fe.s 2003/12/17 03:46:27 1.1 +++ np2/i286a/i286a_fe.s 2003/12/18 13:21:32 1.4 @@ -1,133 +1,141 @@ INCLUDE i286a.inc INCLUDE i286aalu.inc + INCLUDE i286aop.inc - IMPORT _szpcflag8 IMPORT i286a_ea + IMPORT i286a_a IMPORT i286_memoryread IMPORT i286_memoryread_w IMPORT i286_memorywrite IMPORT i286_memorywrite_w + IMPORT i286a_localint - EXPORT i286a_0xfe - EXPORT i286a_0xff + EXPORT i286aopfe + EXPORT i286aopff AREA .text, CODE, READONLY - -i286a_0xfe GETPC8 +i286aopfe GETPC8 tst r0, #(1 << 3) bne decea8 - - cmp r0, #&c0 - bcc inc8m - CPUWORK #2 - R8SRC r0, r5 - ldrb r4, [r5, #CPU_REG] - INC8 r4 - strb r1, [r5, #CPU_REG] - mov pc, r11 -inc8m CPUWORK #7 - bl i286a_ea - cmp r0, #I286_MEMWRITEMAX - bcs inc8e - ldrb r4, [r9, r0] - INC8 r4 - strb r1, [r9, r0] - mov pc, r11 -inc8e mov r5, r0 - bl i286_memoryread - INC8 r0 - mov r0, r5 - mov lr, r11 - b i286_memorywrite - -decea8 cmp r0, #&c0 - bcc dec8m - CPUWORK #2 - R8SRC r0, r5 - ldrb r4, [r5, #CPU_REG] - DEC8 r4 - strb r1, [r5, #CPU_REG] - mov pc, r11 -dec8m CPUWORK #7 - bl i286a_ea - cmp r0, #I286_MEMWRITEMAX - bcs dec8e - ldrb r4, [r9, r0] - DEC8 r4 - strb r1, [r9, r0] - mov pc, r11 -dec8e mov r5, r0 - bl i286_memoryread - DEC8 r0 - mov r0, r5 - mov lr, r11 - b i286_memorywrite +incea8 OP_EA8 INC8, #2, #7 +decea8 OP_EA8 DEC8, #2, #7 ; ---- -i286a_0xff GETPC8 +i286aopff GETPC8 and r12, r0, #(7 << 3) adr r1, opefftbl ldr pc, [r1, r12 lsr #1] - opefftbl dcd incea16 dcd decea16 - + dcd callea16 + dcd callfarea16 + dcd jmpea16 + dcd jmpfarea16 dcd pushea16 dcd popea16 -incea16 cmp r0, #&c0 - bcc inc16m - CPUWORK #2 +incea16 OP_EA16 INC16, #2, #7 +decea16 OP_EA16 DEC16, #2, #7 + +callea16 cmp r0, #&c0 + bcc call16m + CPUWORK #7 R16SRC r0, r5 - ldrh r4, [r5, #CPU_REG] - INC16 r4 - strh r1, [r5, #CPU_REG] - mov pc, r11 -inc16m CPUWORK #7 + ldrh r0, [r5, #CPU_REG] + mov r1, r8 lsr #16 + sub r8, r8, r1 lsl #16 + orr r8, r8, r0 lsl #16 + b call16e +call16m CPUWORK #11 bl i286a_ea - tst r0, #1 - bne inc16e - cmp r0, #I286_MEMWRITEMAX - bcs inc16e - ldrh r4, [r9, r0] - INC16 r4 - strh r1, [r9, r0] - mov pc, r11 -inc16e mov r5, r0 bl i286_memoryread_w - INC16 r0 - mov r0, r5 + mov r1, r8 lsr #16 + sub r8, r8, r1 lsl #16 + orr r8, r8, r0 lsl #16 +call16e ldrh r2, [r9, #CPU_SP] + ldr r3, [r9, #CPU_SS_BASE] + subs r2, r2, #2 + addcc r2, r2, #&10000 + strh r2, [r9, #CPU_SP] + add r0, r2, r3 mov lr, r11 b i286_memorywrite_w -decea16 cmp r0, #&c0 - bcc dec16m - CPUWORK #2 +callfarea16 cmp r0, #&c0 + bcs callfar16r + CPUWORK #16 + bl i286a_a + add r4, r0, #2 + add r0, r0, r6 + bic r4, r4, #(1 << 16) + bl i286_memoryread_w ; ip + mov r5, r8 lsr #16 + add r8, r8, r0 lsl #16 + sub r8, r8, r5 lsl #16 + add r0, r4, r6 + bl i286_memoryread_w ; cs + mov r2, r0 lsl #4 + ldrh r1, [r9, #CPU_CS] + strh r0, [r9, #CPU_CS] + ldrh r4, [r9, #CPU_SP] + ldr r6, [r9, #CPU_SS_BASE] + str r2, [r9, #CPU_CS_BASE] + subs r4, r4, #2 + addcc r4, r4, #&10000 + add r0, r4, r6 + bl i286_memorywrite_w ; cs + subs r4, r4, #2 + addcc r4, r4, #&10000 + mov r1, r5 + strh r4, [r9, #CPU_SP] + add r0, r4, r6 + mov lr, r11 + b i286_memorywrite_w ; ip +callfar16r mov r6, #6 + sub r8, r8, #(2 << 16) + b i286a_localint + +jmpea16 cmp r0, #&c0 + bcc jmp16m + CPUWORK #7 R16SRC r0, r5 - ldrh r4, [r5, #CPU_REG] - DEC16 r4 - strh r1, [r5, #CPU_REG] + ldrh r0, [r5, #CPU_REG] + mov r8, r8 lsl #16 + mov r8, r8 lsr #16 + orr r8, r8, r0 lsl #16 mov pc, r11 -dec16m CPUWORK #7 +jmp16m CPUWORK #11 bl i286a_ea - tst r0, #1 - bne dec16e - cmp r0, #I286_MEMWRITEMAX - bcs dec16e - ldrh r4, [r9, r0] - DEC16 r4 - strh r1, [r9, r0] + bl i286_memoryread_w + mov r8, r8 lsl #16 + mov r8, r8 lsr #16 + orr r8, r8, r0 lsl #16 mov pc, r11 -dec16e mov r5, r0 + +jmpfarea16 cmp r0, #&c0 + bcs jmpfar16r + CPUWORK #11 + bl i286a_a + add r4, r0, #2 + add r0, r0, r6 + bic r4, r4, #(1 << 16) bl i286_memoryread_w - DEC16 r0 - mov r0, r5 - mov lr, r11 - b i286_memorywrite_w + mov r8, r8 lsl #16 + mov r8, r8 lsr #16 + orr r8, r8, r0 lsl #16 + add r0, r4, r6 + bl i286_memoryread_w + mov r1, r0 lsl #4 + strh r0, [r9, #CPU_CS] + str r1, [r9, #CPU_CS_BASE] + mov pc, r11 +jmpfar16r mov r6, #6 + sub r8, r8, #(2 << 16) + b i286a_localint pushea16 cmp r0, #&c0 bcc push16m