diff options
Diffstat (limited to 'sux.h')
| -rw-r--r-- | sux.h | 92 |
1 files changed, 92 insertions, 0 deletions
@@ -55,6 +55,98 @@ extern void io(uint64_t address, uint8_t rw); extern void init_scr(); +static inline uint8_t get_addrsize(uint8_t prefix, uint8_t addrmode) { + uint8_t id = (prefix & 0x0C) >> 2; + switch (addrmode) { + case ZM: + switch (id) { + case 2: return 5; + case 3: return 3; + case 1: return 2; + case 0: return 0; + } + break; + case ABS: + switch (id) { + case 3: return 7; + case 2: return 6; + case 1: return 4; + case 0: return 1; + } + break; + } + return 0; +} + +static inline uint8_t isrw(uint8_t opcode) { + switch (opcode) { + case STA_AB: /* STA Absolute. */ + case STA_Z: /* STA Zero Matrix. */ + case STA_ZX: /* STA Zero Matrix, Indexed with X. */ + case STA_ZY: /* STA Zero Matrix, Indexed with Y. */ + case STA_IN: /* STA Indirect. */ + case STA_IX: /* STA Indexed Indirect. */ + case STA_IY: /* STA Indirect Indexed. */ + case STY_AB: /* STY Absolute. */ + case STY_Z: /* STY Zero Matrix. */ + case STY_IN: /* STY Indirect. */ + case STX_AB: /* STX Absolute. */ + case STX_Z: /* STX Zero Matrix. */ + case STX_IN: /* STX Indirect. */ + case STB_AB: /* STB Absolute. */ + case STB_Z: /* STB Zero Matrix. */ + case STB_ZX: /* STB Zero Matrix, Indexed with X. */ + case STB_ZY: /* STB Zero Matrix, Indexed with Y. */ + case STB_IN: /* STB Indirect. */ + case STB_IX: /* STB Indexed Indirect. */ + case STB_IY: /* STB Indirect Indexed. */ + case INC_AB: /* INC Absolute. */ + case INC_Z: /* INC Zero Matrix. */ + case DEC_AB: /* DEC Absolute. */ + case DEC_Z: /* DEC Zero Matrix. */ + return 0; /* Writing. */ + default: + return 1; /* Reading. */ + } +} +static inline uint8_t isread(uint8_t opcode) { + switch (opcode) { + case LDA_IMM: /* LDA Immediate. */ + case LDA_AB: /* LDA Absolute. */ + case LDA_Z: /* LDA Zero Matrix. */ + case LDA_ZX: /* LDA Zero Matrix, Indexed with X. */ + case LDA_ZY: /* LDA Zero Matrix, Indexed with Y. */ + case LDA_IN: /* LDA Indirect. */ + case LDA_IX: /* LDA Indexed Indirect. */ + case LDA_IY: /* LDA Indirect Indexed. */ + case LDB_IMM: /* LDB Immediate. */ + case LDB_AB: /* LDB Absolute. */ + case LDB_Z: /* LDB Zero Matrix. */ + case LDB_ZX: /* LDB Zero Matrix, Indexed with X. */ + case LDB_ZY: /* LDB Zero Matrix, Indexed with Y. */ + case LDB_IN: /* LDB Indirect. */ + case LDB_IX: /* LDB Indexed Indirect. */ + case LDB_IY: /* LDB Indirect Indexed. */ + case LDY_IMM: /* LDY Immediate. */ + case LDY_AB: /* LDY Absolute. */ + case LDY_Z: /* LDY Zero Matrix. */ + case LDY_IN: /* LDY Indirect. */ + case LDX_IMM: /* LDX Immediate. */ + case LDX_AB: /* LDX Absolute. */ + case LDX_Z: /* LDX Zero Matrix. */ + case LDX_IN: /* LDX Indirect. */ + case JMP_AB: /* JMP Absolute. */ + case JMP_Z: /* JMP Zero Matrix. */ + case JMP_IN: /* JMP Indirect. */ + case JSR_IN: /* JSR Indirect. */ + case JSR_AB: /* Jump to SubRoutine. */ + case JSR_Z: /* JSR Zero Matrix. */ + return 0; + default: + return 1; + } +} + static void *memcopy(void *restrict dst, const void *restrict src, unsigned int n) { #if copy64 uint64_t *d = dst; |