diff options
Diffstat (limited to 'instr.c')
| -rw-r--r-- | instr.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/instr.c b/instr.c deleted file mode 100644 index bef859d..0000000 --- a/instr.c +++ /dev/null @@ -1,149 +0,0 @@ -typedef enum -{ - C8_ILL, -/* Onnn = 0,1,2,A,B */ -/* 00E0 - CLS */ C8_CLS, -/* 00EE - RET */ C8_RET, -/* 0nnn - SYS addr */ C8_SYS, -/* 1nnn - JP addr */ C8_JP, -/* 2nnn - CALL addr */ C8_CALL, -/* Annn - LD I, addr */ C8_LDI, -/* Bnnn - JP V0, addr */ C8_JPV, -/* Oxkk = 3,4,6,7,C,E,F */ -/* 3xkk - SE Vx, byte */ C8_SEB, -/* 4xkk - SNE Vx, byte */ C8_SNEB, -/* 6xkk - LD Vx, byte */ C8_LD, -/* 7xkk - ADD Vx, byte */ C8_ADDB, -/* Cxkk - RND Vx, byte */ C8_RND, -/* Ex9E - SKP Vx */ C8_SKP, -/* ExA1 - SKNP Vx */ C8_SKNP, -/* Fx07 - LD Vx, DT */ C8_MVDT, -/* Fx0A - LD Vx, K */ C8_LDK, -/* Fx15 - LD DT, Vx */ C8_LDDT, -/* Fx18 - LD ST, Vx */ C8_LDST, -/* Fx1E - ADD I, Vx */ C8_ADDI, -/* Fx29 - LD F, Vx */ C8_HEX, -/* Fx33 - LD B, Vx */ C8_BCD, -/* Fx55 - LD [I], Vx */ C8_SAVE, -/* Fx65 - LD Vx, [I] */ C8_RESTORE, -/* Oxyn = 5,8,9,D */ -/* 5xy0 - SE Vx, Vy */ C8_SE, -/* 8xy0 - LD Vx, Vy */ C8_MOVE, -/* 8xy1 - OR Vx, Vy */ C8_OR, -/* 8xy2 - AND Vx, Vy */ C8_AND, -/* 8xy3 - XOR Vx, Vy */ C8_XOR, -/* 8xy4 - ADD Vx, Vy */ C8_ADD, -/* 8xy5 - SUB Vx, Vy */ C8_SUB, -/* 8xy6 - SHR Vx {, Vy} */ C8_SHR, -/* 8xy7 - SUBN Vx, Vy */ C8_SUBN, -/* 8xyE - SHL Vx {, Vy} */ C8_SHL, -/* 9xy0 - SNE Vx, Vy */ C8_SNE, -/* Dxyn - DRW Vx, Vy, nibble */ C8_DRW, - C8_OP_CNT - -} chip8_op; - -typedef void (*instr_func)(chip8* c8, chip8_op op, u16 nnn, u8 x, u8 y, u8 n, u8 kk); - - -const char* chip8_disasm_fmts[C8_OP_CNT] = -{ - "ILL unknown", - "CLS", - "RET", - "SYS %03X", - "JP %03X", - "CALL %03X", - "LD I, %03X", - "JP V0, %03X", - "SE V%-2x, %-2d", - "SNE V%-2x, %-2d", - "LD V%-2x, %-2d", - "ADD V%-2x, %-2d", - "RND V%-2x, %-2d", - "SKP V%-2x", - "SKNP V%-2x", - "LD V%-2x, DT", - "LD V%-2x, K", - "LD DT, V%-2x", - "LD ST, V%-2x", - "ADD I, V%-2x", - "LD F, V%-2x", - "LD B, V%-2x", - "LD [I], V%-2x", - "LD V%-2x, [I]", - "SE V%-2x, V%-2x", - "LD V%-2x, V%-2x", - "OR V%-2x, V%-2x", - "AND V%-2x, V%-2x", - "XOR V%-2x, V%-2x", - "ADD V%-2x, V%-2x", - "SUB V%-2x, V%-2x", - "SHR V%-2x, V%-2x", - "SUBN V%-2x, V%-2x", - "SHL V%-2x, V%-2x", - "SNE V%-2x, V%-2x", - "DRW V%-2x, V%-2x, %-1d" -}; - -void c8_decode(u8* code, u16 offset, instr_func func, chip8* c8); -void c8_disasm(chip8* c8, chip8_op op, u16 nnn, u8 x, u8 y, u8 n, u8 kk); -void c8_do(chip8* c8, chip8_op op, u16 nnn, u8 x, u8 y, u8 n, u8 kk); - -void c8_decode(u8* code, u16 offset, instr_func func, chip8* c8) -{ - chip8_op op = C8_ILL; - u16 word, instr, nnn; - u8 o, x, y, n, kk; - - word = *(u16*)(code + offset); - instr = be16toh(word); - o = (instr & 0xF000) >> 12; - nnn = (instr & 0x0FFF); - x = (instr & 0x0F00) >> 8; - y = (instr & 0x00F0) >> 4; - n = (instr & 0x000F); - kk = (instr & 0x00FF); - - if(o == 0 && nnn == 0x0E0) op = C8_CLS; - else if(o == 0 && nnn == 0x0EE) op = C8_RET; - else if(o == 0) op = C8_SYS; - else if(o == 1) op = C8_JP; - else if(o == 2) op = C8_CALL; - else if(o == 0xA) op = C8_LDI; - else if(o == 0xB) op = C8_JPV; - else if(o == 3) op = C8_SEB; - else if(o == 4) op = C8_SNEB; - else if(o == 6) op = C8_LD; - else if(o == 7) op = C8_ADDB; - else if(o == 0xC) op = C8_RND; - else if(o == 0xE && kk == 0x9E) op = C8_SKP; - else if(o == 0xE && kk == 0xA1) op = C8_SKNP; - else if(o == 0xF && kk == 0x07) op = C8_MVDT; - else if(o == 0xF && kk == 0x0A) op = C8_LDK; - else if(o == 0xF && kk == 0x15) op = C8_LDDT; - else if(o == 0xF && kk == 0x18) op = C8_LDST; - else if(o == 0xF && kk == 0x1E) op = C8_ADDI; - else if(o == 0xF && kk == 0x29) op = C8_HEX; - else if(o == 0xF && kk == 0x33) op = C8_BCD; - else if(o == 0xF && kk == 0x55) op = C8_SAVE; - else if(o == 0xF && kk == 0x65) op = C8_RESTORE; - else if(o == 5 && n == 0) op = C8_SE; - else if(o == 8 && n == 0) op = C8_MOVE; - else if(o == 8 && n == 1) op = C8_OR; - else if(o == 8 && n == 2) op = C8_AND; - else if(o == 8 && n == 3) op = C8_XOR; - else if(o == 8 && n == 4) op = C8_ADD; - else if(o == 8 && n == 5) op = C8_SUB; - else if(o == 8 && n == 6) op = C8_SHR; - else if(o == 8 && n == 7) op = C8_SUBN; - else if(o == 8 && n == 0xE) op = C8_SHL; - else if(o == 9 && n == 0) op = C8_SNE; - else if(o == 0xD) op = C8_DRW; - - func(c8, op, nnn, x, y, n, kk); -} - -void c8_disasm(chip8* c8, chip8_op op, u16 nnn, u8 x, u8 y, u8 kk, u8 n); -void c8_do(chip8* c8, chip8_op op, u16 nnn, u8 x, u8 y, u8 kk, u8 n); - |