diff options
Diffstat (limited to 'sources/instr.c')
| -rw-r--r-- | sources/instr.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/sources/instr.c b/sources/instr.c new file mode 100644 index 0000000..8c0b132 --- /dev/null +++ b/sources/instr.c @@ -0,0 +1,102 @@ +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; + + +#define c8_decode_generate(name) \ +void c8_##name(u8* code, u16 offset, void* usrdat) \ +{ \ + u16 word, instr, nnn; \ + u8 o, x, y, n, kk; \ + \ + (void)usrdat; \ + \ + 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) X_C8_CLS; \ + else if(o == 0 && nnn == 0x0EE) X_C8_RET; \ + else if(o == 0) X_C8_SYS; \ + else if(o == 1) X_C8_JP; \ + else if(o == 2) X_C8_CALL; \ + else if(o == 0xA) X_C8_LDI; \ + else if(o == 0xB) X_C8_JPV; \ + else if(o == 3) X_C8_SEB; \ + else if(o == 4) X_C8_SNEB; \ + else if(o == 6) X_C8_LD; \ + else if(o == 7) X_C8_ADDB; \ + else if(o == 0xC) X_C8_RND; \ + else if(o == 0xE && kk == 0x9E) X_C8_SKP; \ + else if(o == 0xE && kk == 0xA1) X_C8_SKNP; \ + else if(o == 0xF && kk == 0x07) X_C8_MVDT; \ + else if(o == 0xF && kk == 0x0A) X_C8_LDK; \ + else if(o == 0xF && kk == 0x15) X_C8_LDDT; \ + else if(o == 0xF && kk == 0x18) X_C8_LDST; \ + else if(o == 0xF && kk == 0x1E) X_C8_ADDI; \ + else if(o == 0xF && kk == 0x29) X_C8_HEX; \ + else if(o == 0xF && kk == 0x33) X_C8_BCD; \ + else if(o == 0xF && kk == 0x55) X_C8_SAVE; \ + else if(o == 0xF && kk == 0x65) X_C8_RESTORE; \ + else if(o == 5 && n == 0) X_C8_SE; \ + else if(o == 8 && n == 0) X_C8_MOVE; \ + else if(o == 8 && n == 1) X_C8_OR; \ + else if(o == 8 && n == 2) X_C8_AND; \ + else if(o == 8 && n == 3) X_C8_XOR; \ + else if(o == 8 && n == 4) X_C8_ADD; \ + else if(o == 8 && n == 5) X_C8_SUB; \ + else if(o == 8 && n == 6) X_C8_SHR; \ + else if(o == 8 && n == 7) X_C8_SUBN; \ + else if(o == 8 && n == 0xE) X_C8_SHL; \ + else if(o == 9 && n == 0) X_C8_SNE; \ + else if(o == 0xD) X_C8_DRW; \ + else X_C8_ILL; \ +} + +#include "meta/disasm.c" |