Mercurial > repos > blastem
diff 68kinst.h @ 0:2432d177e1ac
Initial work on M68K instruction decoding
author | Mike Pavone <pavone@retrodev.com> |
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date | Mon, 29 Oct 2012 01:18:38 -0700 |
parents | |
children | 5df303bf72e6 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/68kinst.h Mon Oct 29 01:18:38 2012 -0700 @@ -0,0 +1,150 @@ +#include <stdint.h> + +typedef enum { + BIT_MOVEP_IMMED = 0, + MOVE_BYTE, + MOVE_LONG, + MOVE_WORD, + MISC, + QUICK_ARITH_LOOP, + BRANCH, + MOVEQ, + OR_DIV_SBCD, + SUB_SUBX, + RESERVED, + CMP_XOR, + AND_MUL_ABCD_EXG, + ADD_ADDX, + SHIFT_ROTATE, + COPROC +} m68k_optypes; + +typedef enum { + M68K_ABCD, + M68K_ADD, + M68K_ADDX, + M68K_AND, + M68K_ANDI_CCR, + M68K_ANDI_SR, + M68K_ASL, + M68K_ASR, + M68K_BCC, + M68K_BCHG, + M68K_BCLR, + M68K_BSET, + M68K_BSR, + M68K_BTST, + M68K_CHK, + M68K_CLR, + M68K_CMP, + M68K_DBCC, + M68K_DIVS, + M68K_DIVU, + M68K_EOR, + M68K_EORI_CCR, + M68K_EORI_SR, + M68K_EXG, + M68K_EXT, + M68K_ILLEGAL, + M68K_JMP, + M68K_JSR, + M68K_LEA, + M68K_LINK + M68K_LSL, + M68K_LSR, + M68K_MOVE, + M68K_MOVE_CCR, + M68K_MOVE_FROM_SR, + M68K_MOVE_SR, + M68K_MOVE_USP, + M68K_MOVEM, + M68K_MOVEP, + M68K_MULS, + M68K_MULU, + M68K_NBCD, + M68K_NEG, + M68K_NEGX, + M68K_NOP, + M68K_NOT, + M68K_OR, + M68K_ORI_CCR, + M68K_ORI_SR, + M68K_PEA, + M68K_RESET, + M68K_ROL, + M68K_ROR, + M68K_ROXL, + M68K_ROXR, + M68K_RTE, + M68K_RTR, + M68K_RTS, + M68K_SBCD, + M68K_SCC, + M68K_STOP, + M68K_SUB, + M68K_SUBX, + M68K_SWAP, + M68K_TAS, + M68K_TRAP, + M68k_TRAPV + M68K_TST, + M68K_UNLNK +} m68K_op; + +typedef enum { + VAR_NORMAL, + VAR_QUICK +} m68K_variant; + +typedef enum { + OPSIZE_BYTE=0, + OPSIZE_WORD, + OPSIZE_LONG +} m68K_opsizes; + +typedef enum { + MODE_REG = 0, + MODE_AREG, + MODE_AREG_INDIRECT, + MODE_AREG_POSTINC, + MODE_AREG_PREDEC, + MODE_AREG_DISPLACE, + MODE_AREG_INDEX_MEM, //bunch of relatively complicated modes + MODE_PC_INDIRECT_ABS_IMMED //Modes that use the program counter, an absolute address or immediate value +} m68k_addr_modes; + +typedef enum { + MODE_ABSOLUTE=0, + MODE_PC_DISPLACE, + MODE_PC_INDEX, + MODE_IMMEDIATE +} m68k_addr_extended; + +typedef struct { + uint8_t addr_mode; + union { + struct { + uint8_t pri; + uint8_t sec; + int32_t displacement; + } regs; + uint8_t u8; + uint16_t u16; + uint32_t u32; + } params; +} m68k_op_info; + +typedef struct { + uint8_t op; + uint8_t variant; + union { + uint8_t size; + uint8_t cond; + } extra; + m68k_op_info src; + m68k_op_info dst; +} m68kinst; + +uint16_t * m68K_decode(uint16_t * istream, m68kinst * dst); +uint32_t m68k_cycles(m68kinst * inst); +