`define ALU_ADD 4'b0100
`define ALU_ADC 4'b0101
`define ALU_SBC 4'b0110
-`define ALU_RBC 4'b0111
+`define ALU_RSC 4'b0111
`define ALU_TST 4'b1000
`define ALU_TEQ 4'b1001
`define ALU_CMP 4'b1010
`define SHIFT_LSR 2'b01
`define SHIFT_ASR 2'b10
`define SHIFT_ROR 2'b11
+
+`define DECODE_ALU_MULT 32'b????000000??????????????1001???? /* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
+`define DECODE_ALU_MUL_LONG 32'b????00001???????????????1001???? /* Multiply long */
+`define DECODE_ALU_MRS 32'b????00010?001111????000000000000 /* MRS (Transfer PSR to register) */
+`define DECODE_ALU_MSR 32'b????00010?101001111100000000???? /* MSR (Transfer register to PSR) */
+`define DECODE_ALU_MSR_FLAGS 32'b????00?10?1010001111???????????? /* MSR (Transfer register or immediate to PSR, flag bits only) */
+`define DECODE_ALU_SWP 32'b????00010?00????????00001001???? /* Atomic swap */
+`define DECODE_ALU_BX 32'b????000100101111111111110001???? /* Branch and exchange */
+`define DECODE_ALU_HDATA_REG 32'b????000??0??????????00001??1???? /* Halfword transfer - register offset */
+`define DECODE_ALU_HDATA_IMM 32'b????000??1??????????00001??1???? /* Halfword transfer - immediate offset */
+`define DECODE_ALU 32'b????00?????????????????????????? /* ALU */
+`define DECODE_LDRSTR_UNDEFINED 32'b????011????????????????????1???? /* Undefined. I hate ARM */
+`define DECODE_LDRSTR 32'b????01?????????????????????????? /* Single data transfer */
+`define DECODE_LDMSTM 32'b????100????????????????????????? /* Block data transfer */
+`define DECODE_BRANCH 32'b????101????????????????????????? /* Branch */
+`define DECODE_LDCSTC 32'b????110????????????????????????? /* Coprocessor data transfer */
+`define DECODE_CDP 32'b????1110???????????????????0???? /* Coprocessor data op */
+`define DECODE_MRCMCR 32'b????1110???????????????????1???? /* Coprocessor register transfer */
+`define DECODE_SWI 32'b????1111???????????????????????? /* SWI */
+
+`define MODE_USR 5'b10000
+`define MODE_FIQ 5'b10001
+`define MODE_IRQ 5'b10010
+`define MODE_SVC 5'b10011
+`define MODE_ABT 5'b10111
+`define MODE_UND 5'b11011
+`define MODE_SYS 5'b11111