// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** asapdasm.c Disassembler for the portable ASAP emulator. Written by Aaron Giles ***************************************************************************/ #include "emu.h" #include "asap.h" static const char *const reg[32] = { "0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31" }; static const char *const setcond[2] = { " ", ".c" }; static const char *const condition[16] = { "sp", "mz", "gt", "le", "ge", "lt", "hi", "ls", "cc", "cs", "pl", "mi", "ne", "eq", "vc", "vs" }; /*************************************************************************** CODE CODE ***************************************************************************/ static inline char *src2(UINT32 op, int scale) { static char temp[20]; if ((op & 0xffe0) == 0xffe0) sprintf(temp, "%s", reg[op & 31]); else sprintf(temp, "$%x", (op & 0xffff) << scale); return temp; } CPU_DISASSEMBLE( asap ) { UINT32 op = oprom[0] | (oprom[1] << 8) | (oprom[2] << 16) | (oprom[3] << 24); int opcode = op >> 27; int cond = (op >> 21) & 1; int rdst = (op >> 22) & 31; int rsrc1 = (op >> 16) & 31; int rsrc2 = op & 0xffff; int rsrc2_iszero = (!rsrc2 || rsrc2 == 0xffe0); UINT32 flags = 0; switch (opcode) { case 0x00: sprintf(buffer, "trap $00"); flags = DASMFLAG_STEP_OVER; break; case 0x01: sprintf(buffer, "b%s $%08x", condition[rdst & 15], pc + ((INT32)(op << 10) >> 8)); break; case 0x02: if ((op & 0x003fffff) == 3) { UINT32 nextop = oprom[4] | (oprom[5] << 8) | (oprom[6] << 16) | (oprom[7] << 24); if ((nextop >> 27) == 0x10 && ((nextop >> 22) & 31) == rdst && (nextop & 0xffff) == 0) { UINT32 nextnextop = oprom[8] | (oprom[9] << 8) | (oprom[10] << 16) | (oprom[11] << 24); sprintf(buffer, "llit%s $%08x,%s", setcond[cond], nextnextop, reg[rdst]); return 12 | DASMFLAG_STEP_OVER | DASMFLAG_SUPPORTED; } } if (rdst) { flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1); sprintf(buffer, "bsr %s,$%08x", reg[rdst], pc + ((INT32)(op << 10) >> 8)); } else sprintf(buffer, "bra $%08x", pc + ((INT32)(op << 10) >> 8)); break; case 0x03: sprintf(buffer, "lea%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,2), reg[rdst]); break; case 0x04: sprintf(buffer, "leah%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; case 0x05: sprintf(buffer, "subr%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x06: sprintf(buffer, "xor%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x07: sprintf(buffer, "xorn%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x08: if (!rsrc1 && !rdst && rsrc2_iszero) sprintf(buffer, "nop"); else if (!rsrc1) sprintf(buffer, "mov%s %s,%s", setcond[cond], src2(op,0), reg[rdst]); else if (rsrc2_iszero) sprintf(buffer, "mov%s %s,%s", setcond[cond], reg[rsrc1], reg[rdst]); else sprintf(buffer, "add%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x09: sprintf(buffer, "sub%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x0a: sprintf(buffer, "addc%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x0b: sprintf(buffer, "subc%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x0c: sprintf(buffer, "and%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x0d: sprintf(buffer, "andn%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x0e: if (!rsrc1 && !rdst && rsrc2_iszero) sprintf(buffer, "nop"); else if (!rsrc1) sprintf(buffer, "mov%s %s,%s", setcond[cond], src2(op,0), reg[rdst]); else if (rsrc2_iszero) sprintf(buffer, "mov%s %s,%s", setcond[cond], reg[rsrc1], reg[rdst]); else sprintf(buffer, "or%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x0f: sprintf(buffer, "orn%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x10: sprintf(buffer, "ld%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,2), reg[rdst]); break; case 0x11: sprintf(buffer, "ldh%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; case 0x12: sprintf(buffer, "lduh%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; case 0x13: sprintf(buffer, "sth%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; case 0x14: sprintf(buffer, "st%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,2), reg[rdst]); break; case 0x15: sprintf(buffer, "ldb%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x16: sprintf(buffer, "ldub%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x17: sprintf(buffer, "stb%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x18: sprintf(buffer, "ashr%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x19: sprintf(buffer, "lshr%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x1a: sprintf(buffer, "ashl%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x1b: sprintf(buffer, "rotl%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; case 0x1c: sprintf(buffer, "getps %s", reg[rdst]); break; case 0x1d: sprintf(buffer, "putps %s", src2(op,0)); break; case 0x1e: if (rdst && rsrc2_iszero) { flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1); sprintf(buffer, "jsr%s %s,%s", setcond[cond], reg[rdst], reg[rsrc1]); } else if (rdst) { flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1); sprintf(buffer, "jsr%s %s,%s[%s]", setcond[cond], reg[rdst], reg[rsrc1], src2(op,2)); } else if (rsrc2_iszero) { if (rsrc1 == 28) flags = DASMFLAG_STEP_OUT; sprintf(buffer, "jmp%s %s", setcond[cond], reg[rsrc1]); } else sprintf(buffer, "jmp%s %s[%s]", setcond[cond], reg[rsrc1], src2(op,2)); break; case 0x1f: sprintf(buffer, "trap $1f"); flags = DASMFLAG_STEP_OVER; break; } return 4 | flags | DASMFLAG_SUPPORTED; }