/*************************************************************************** jagdasm.c Disassembler for the portable Jaguar DSP emulator. Written by Aaron Giles ***************************************************************************/ #include "emu.h" #include "jaguar.h" /*************************************************************************** MEMORY ACCESSORS ***************************************************************************/ #define ROPCODE(offs) ((oprom[offs] << 8) | oprom[(offs) + 1]) /*************************************************************************** STATIC VARIABLES ***************************************************************************/ static const UINT8 convert_zero[32] = { 32,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 }; static const char *const condition[32] = { "", "nz,", "z,", "???,", "nc,", "nc nz,", "nc z,", "???,", "c,", "c nz,", "c z,", "???,", "???,", "???,", "???,", "???,", "???,", "???,", "???,", "???,", "nn,", "nn nz,", "nn z,", "???,", "n,", "n nz,", "n z,", "???,", "???,", "???,", "???,", "never," }; /*************************************************************************** CODE CODE ***************************************************************************/ INLINE char *signed_16bit(INT16 val) { static char temp[10]; if (val < 0) sprintf(temp, "-$%x", -val); else sprintf(temp, "$%x", val); return temp; } static unsigned dasmjag(int variant, char *buffer, unsigned pc, const UINT8 *oprom) { UINT32 flags = 0; int op = ROPCODE(0); int reg1 = (op >> 5) & 31; int reg2 = op & 31; int size = 2; pc += 2; switch (op >> 10) { case 0: sprintf(buffer, "add r%d,r%d", reg1, reg2); break; case 1: sprintf(buffer, "addc r%d,r%d", reg1, reg2); break; case 2: sprintf(buffer, "addq $%x,r%d", convert_zero[reg1], reg2); break; case 3: sprintf(buffer, "addqt $%x,r%d", convert_zero[reg1], reg2); break; case 4: sprintf(buffer, "sub r%d,r%d", reg1, reg2); break; case 5: sprintf(buffer, "subc r%d,r%d", reg1, reg2); break; case 6: sprintf(buffer, "subq $%x,r%d", convert_zero[reg1], reg2); break; case 7: sprintf(buffer, "subqt $%x,r%d", convert_zero[reg1], reg2); break; case 8: sprintf(buffer, "neg r%d", reg2); break; case 9: sprintf(buffer, "and r%d,r%d", reg1, reg2); break; case 10: sprintf(buffer, "or r%d,r%d", reg1, reg2); break; case 11: sprintf(buffer, "xor r%d,r%d", reg1, reg2); break; case 12: sprintf(buffer, "not r%d", reg2); break; case 13: sprintf(buffer, "btst $%x,r%d", reg1, reg2); break; case 14: sprintf(buffer, "bset $%x,r%d", reg1, reg2); break; case 15: sprintf(buffer, "bclr $%x,r%d", reg1, reg2); break; case 16: sprintf(buffer, "mult r%d,r%d", reg1, reg2); break; case 17: sprintf(buffer, "imult r%d,r%d", reg1, reg2); break; case 18: sprintf(buffer, "imultn r%d,r%d", reg1, reg2); break; case 19: sprintf(buffer, "resmac r%d", reg2); break; case 20: sprintf(buffer, "imacn r%d,r%d", reg1, reg2); break; case 21: sprintf(buffer, "div r%d,r%d", reg1, reg2); break; case 22: sprintf(buffer, "abs r%d", reg2); break; case 23: sprintf(buffer, "sh r%d,r%d", reg1, reg2); break; case 24: sprintf(buffer, "shlq $%x,r%d", 32 - convert_zero[reg1], reg2); break; case 25: sprintf(buffer, "shrq $%x,r%d", convert_zero[reg1], reg2); break; case 26: sprintf(buffer, "sha r%d,r%d", reg1, reg2); break; case 27: sprintf(buffer, "sharq $%x,r%d", convert_zero[reg1], reg2); break; case 28: sprintf(buffer, "ror r%d,r%d", reg1, reg2); break; case 29: sprintf(buffer, "rorq $%x,r%d", convert_zero[reg1], reg2); break; case 30: sprintf(buffer, "cmp r%d,r%d", reg1, reg2); break; case 31: sprintf(buffer, "cmpq %s,r%d", signed_16bit((INT16)(reg1 << 11) >> 11), reg2);break; case 32: if (variant == JAGUAR_VARIANT_GPU) sprintf(buffer, "sat8 r%d", reg2); else sprintf(buffer, "subqmod $%x,r%d", convert_zero[reg1], reg2); break; case 33: if (variant == JAGUAR_VARIANT_GPU) sprintf(buffer, "sat16 r%d", reg2); else sprintf(buffer, "sat16s r%d", reg2); break; case 34: sprintf(buffer, "move r%d,r%d", reg1, reg2); break; case 35: sprintf(buffer, "moveq %d,r%d", reg1, reg2); break; case 36: sprintf(buffer, "moveta r%d,r%d", reg1, reg2); break; case 37: sprintf(buffer, "movefa r%d,r%d", reg1, reg2); break; case 38: sprintf(buffer, "movei $%x,r%d", ROPCODE(2) | (ROPCODE(4)<<16), reg2); size = 6; break; case 39: sprintf(buffer, "loadb (r%d),r%d", reg1, reg2); break; case 40: sprintf(buffer, "loadw (r%d),r%d", reg1, reg2); break; case 41: sprintf(buffer, "load (r%d),r%d", reg1, reg2); break; case 42: if (variant == JAGUAR_VARIANT_GPU) sprintf(buffer, "loadp (r%d),r%d", reg1, reg2); else sprintf(buffer, "sat32s r%d", reg2); break; case 43: sprintf(buffer, "load (r14+$%x),r%d", convert_zero[reg1]*4, reg2);break; case 44: sprintf(buffer, "load (r15+$%x),r%d", convert_zero[reg1]*4, reg2);break; case 45: sprintf(buffer, "storeb r%d,(r%d)", reg2, reg1); break; case 46: sprintf(buffer, "storew r%d,(r%d)", reg2, reg1); break; case 47: sprintf(buffer, "store r%d,(r%d)", reg2, reg1); break; case 48: if (variant == JAGUAR_VARIANT_GPU) sprintf(buffer, "storep r%d,(r%d)", reg2, reg1); else sprintf(buffer, "mirror r%d", reg2); break; case 49: sprintf(buffer, "store r%d,(r14+$%x)", reg2, convert_zero[reg1]*4);break; case 50: sprintf(buffer, "store r%d,(r15+$%x)", reg2, convert_zero[reg1]*4);break; case 51: sprintf(buffer, "move pc,r%d", reg2); break; case 52: sprintf(buffer, "jump %s(r%d)", condition[reg2], reg1); break; case 53: sprintf(buffer, "jr %s%08X", condition[reg2], pc + ((INT8)(reg1 << 3) >> 2)); break; case 54: sprintf(buffer, "mmult r%d,r%d", reg1, reg2); break; case 55: sprintf(buffer, "mtoi r%d,r%d", reg1, reg2); break; case 56: sprintf(buffer, "normi r%d,r%d", reg1, reg2); break; case 57: sprintf(buffer, "nop"); break; case 58: sprintf(buffer, "load (r14+r%d),r%d", reg1, reg2); break; case 59: sprintf(buffer, "load (r15+r%d),r%d", reg1, reg2); break; case 60: sprintf(buffer, "store r%d,(r14+r%d)", reg2, reg1); break; case 61: sprintf(buffer, "store r%d,(r15+r%d)", reg2, reg1); break; case 62: if (variant == JAGUAR_VARIANT_GPU) sprintf(buffer, "sat24 r%d", reg2); else sprintf(buffer, "illegal"); break; case 63: if (variant == JAGUAR_VARIANT_GPU) sprintf(buffer, reg1 ? "unpack r%d" : "pack r%d", reg2); else sprintf(buffer, "addqmod $%x,r%d", convert_zero[reg1], reg2); break; } return size | flags | DASMFLAG_SUPPORTED; } CPU_DISASSEMBLE( jaguargpu ) { return dasmjag(JAGUAR_VARIANT_GPU, buffer, pc, oprom); } CPU_DISASSEMBLE( jaguardsp ) { return dasmjag(JAGUAR_VARIANT_DSP, buffer, pc, oprom); }