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#include "sux.h"
#include "disasm.h"
#include <string.h>

#define ORTHO_1CC(mne, cc) \
	mne##_R##cc: case mne##_M##cc

#define ORTHO_1OP(mne) \
	mne##_R: case mne##_M

#define ORTHO_2OP(mne) \
	mne##_RR: case mne##_RM: case mne##_MR: case mne##_MM


void print_regs(struct sux *cpu, uint8_t lines, uint8_t thread) {
	for (uint8_t i = (24*thread)+2; i <= 24*(thread+1); i++) {
		wmove(scr, i, 0);
		waddch(scr, (i == lines) ? '>' : ' ');
	}
	wmove(scr, lines, 1);
	wclrtoeol(scr);
	wprintw(scr, "pc: $%04"PRIX64  , cpu->pc);
	wprintw(scr, ", a: $%08"PRIX64, cpu->a);
	wprintw(scr, ", b: $%08"PRIX64, cpu->b);
	wprintw(scr, ", x: $%08"PRIX64, cpu->x);
	wprintw(scr, ", y: $%08"PRIX64, cpu->y);
	wprintw(scr, ", e: $%08"PRIX64, cpu->e);
	wprintw(scr, ", sp: $%"PRIX64, cpu->sp);
	wprintw(scr, ", ps: %c%c---%c%c%c", cpu->ps.u8[thread] & N ? 'N' : '-'
					  , cpu->ps.u8[thread] & V ? 'V' : '-'
					  , cpu->ps.u8[thread] & I ? 'I' : '-'
					  , cpu->ps.u8[thread] & Z ? 'Z' : '-'
					  , cpu->ps.u8[thread] & C ? 'C' : '-');
	wprintw(scr, ", inst: ");
}

static uint64_t get_offset(uint64_t value, uint8_t size, char **sign) {
	size = (size > 8) ? 8 : size;
	uint8_t msb = size*8;
	uint64_t mask = (-(uint64_t)1 >> ((8 - size) * 8));
	mask &= (1 << (msb-1));
	*sign = ((value >> (msb-1)) & 1) ? "-" : "+";
	if (*sign[0] == '-') {
		value &= mask;
		value = -(value+1);
	}
	return value;
}

/* Checks if the opcode, and operands required an ortho suffix. */
static int is_os(uint8_t opcode, operand *op) {
	uint8_t is_mem = (op[0].type == 1 && op[0].id != MEM_IMM);
	uint8_t is_idx = (is_mem && !op[1].type && (op[1].id == REG_X || op[1].id == REG_Y));
	int is_valid = 1;
	int is_sp = 0;
	if (is_mem || is_idx) {
		switch (op[0].id) {
			case MEM_AINDR:
			case MEM_ZINDR:
			case MEM_ARIND:
			case MEM_ZRIND:
			case MEM_SIB  : is_valid = 0; break;
			case MEM_ZMR  :
			case MEM_ABSR :
			case MEM_RIND :
			default       :
				if (is_mem && !op[1].type && op[1].id != REG_X && op[1].id != REG_Y) {
					is_valid = 0;
				} else if (op[0].id == MEM_ZMR || op[0].id == MEM_ABSR || op[0].id == MEM_RIND) {
					is_valid = (op[0].rind[0] == REG_SP);
					is_sp = (op[0].rind[0] == REG_SP);
				} else if (is_mem && op[1].type == 1) {
					is_valid = 0;
				}
				break;
		}
	}
	switch (opcode) {
		case ORTHO_2OP(CMP): return (is_idx && is_valid && ((is_sp && op[0].id == MEM_RIND) || (!is_sp && op[0].id == MEM_IND)));
		case ORTHO_2OP(LEA): return (is_idx && is_valid);
	}
	return 0;
}

static int is_1cc(uint8_t opcode) {
	switch (opcode) {
		case ORTHO_1CC(SET, NG):
		case ORTHO_1CC(SET, PO):
		case ORTHO_1CC(SET, CS):
		case ORTHO_1CC(SET, CC):
		case ORTHO_1CC(SET, EQ):
		case ORTHO_1CC(SET, NE):
		case ORTHO_1CC(SET, VS):
		case ORTHO_1CC(SET, VC): return 1;
	}
	return 0;
}

static int is_1op(uint8_t opcode) {
	switch (opcode) {
		case ORTHO_1OP(PSH):
		case ORTHO_1OP(PEA):
		case ORTHO_1OP(PUL):
		case ORTHO_1OP(SWP):
		case ORTHO_1OP(NOT):
		case ORTHO_1OP(NEG):
		case ORTHO_1OP(DEC):
		case ORTHO_1OP(INC):
		case ORTHO_1OP(CLZ):
		case ORTHO_1OP(CLO): return 1;
	}
	return 0;
}

static int is_2op(uint8_t opcode) {
	switch (opcode) {
		case ORTHO_2OP(MNG):
		case ORTHO_2OP(ADC):
		case ORTHO_2OP(ROR):
		case ORTHO_2OP(ADD):
		case ORTHO_2OP(MPO):
		case ORTHO_2OP(SBC):
		case ORTHO_2OP(MUL):
		case ORTHO_2OP(SUB):
		case ORTHO_2OP(MCS):
		case ORTHO_2OP(AND):
		case ORTHO_2OP(DIV):
		case ORTHO_2OP(PCN):
		case ORTHO_2OP(MCC):
		case ORTHO_2OP(OR ):
		case ORTHO_2OP(ASR):
		case ORTHO_2OP(LEA):
		case ORTHO_2OP(MEQ):
		case ORTHO_2OP(XOR):
		case ORTHO_2OP(CMP):
		case ORTHO_2OP(MNE):
		case ORTHO_2OP(LSL):
		case ORTHO_2OP(MOV):
		case ORTHO_2OP(MVS):
		case ORTHO_2OP(LSR):
		case ORTHO_2OP(IML):
		case ORTHO_2OP(MVC):
		case ORTHO_2OP(ROL):
		case ORTHO_2OP(IDV): return 1;
	}
	return 0;
}

static void disasm_ortho(struct sux *cpu, uint8_t opcode, uint8_t prefix, uint8_t prefix2, uint64_t *value, char *inst_name, char *postfix, operand *op, uint8_t rs, uint8_t thread) {
	char opr[2][256];
	char address[2][17];
	char *rind[2] = {"", ""};
	char *sign[2] = {"", ""};
	char *ind[2] = {"", ""};
	char idx[2][33];
	char scale[2][5];
	char *reg[2] = {"", ""};
	memset(opr, 0, sizeof(opr));
	memset(address, 0, sizeof(address));
	memset(idx, 0, sizeof(idx));
	memset(scale, 0, sizeof(scale));
	for (int i = 0; i < 2; i++) {
		int is_ind = 0;
		int is_rind = 0;
		uint64_t val = 0;
		if (op[i].type) {
			uint8_t addr_size = get_ortho_addrsize(prefix, op[i].id);
			if (addr_size != 0xFF) {
				uint64_t value = get_offset(op[i].value, addr_size+1, &sign[i]);
				sprintf(address[i], "$%0*"PRIX64, (addr_size+1)*2, value);
			}
			if (op[i].id == MEM_SIB) {
				sprintf(scale[i], "%u*", op[i].scale+1);
			} else if (op[i].id == MEM_IMM) {
				val = read_value(cpu, 0, value[i], rs-1, 0, 0);
			}
			switch (op[i].id) {
				case MEM_ABSR :
				case MEM_ZMR  :
				case MEM_AINDR:
				case MEM_AIND :
				case MEM_ZINDR:
				case MEM_ARIND:
				case MEM_ZRIND:
				case MEM_SIB  :
				case MEM_RIND : is_rind = 1; break;
			}
			if (is_rind) {
				for (int j = 0; j < 2 && op[i].rind[j] != 0xFF; j++) {
					switch (op[i].rind[j]) {
						case REG_A  : rind[j] =   "A";	break;
						case REG_B  : rind[j] =   "B";	break;
						case REG_X  : rind[j] =   "X";	break;
						case REG_Y  : rind[j] =   "Y";	break;
						case REG_E  : rind[j] =   "E";	break;
						case REG_C  : rind[j] =   "C";	break;
						case REG_D  : rind[j] =   "D";	break;
						case REG_S  : rind[j] =   "S";	break;
						case REG_F  : rind[j] =   "F";	break;
						case REG_SP : rind[j] =  "SP";	break;
						case REG_BP : rind[j] =  "BP";	break;
						case REG_R11: rind[j] = "R11";	break;
						case REG_R12: rind[j] = "R12";	break;
						case REG_R13: rind[j] = "R13";	break;
						case REG_R14: rind[j] = "R14";	break;
						case REG_R15: rind[j] = "R15";	break;
					}
				}
			}
			sprintf(idx[i], "%s%s%s%s", scale[i], rind[0], (op[i].rind[1] != 0xFF) ? "+" : "", rind[1]);
			switch (op[i].id) {
				case MEM_AINDR:
				case MEM_AIND :
				case MEM_ZINDR:
				case MEM_IND  : is_ind = 1; break;
				case MEM_ARIND:
				case MEM_ZRIND:
				case MEM_SIB  :
				case MEM_RIND : is_ind = 2; break;
				case MEM_IMM  : is_ind = 3; break;
			}
			if (!is_rind) {
				sign[i] = "";
			}
		} else {
			is_ind = 4;
			switch (op[i].id) {
				case REG_A  : reg[i] =   "A";	break;
				case REG_B  : reg[i] =   "B";	break;
				case REG_X  : reg[i] =   "X";	break;
				case REG_Y  : reg[i] =   "Y";	break;
				case REG_E  : reg[i] =   "E";	break;
				case REG_C  : reg[i] =   "C";	break;
				case REG_D  : reg[i] =   "D";	break;
				case REG_S  : reg[i] =   "S";	break;
				case REG_F  : reg[i] =   "F";	break;
				case REG_SP : reg[i] =  "SP";	break;
				case REG_BP : reg[i] =  "BP";	break;
				case REG_R11: reg[i] = "R11";	break;
				case REG_R12: reg[i] = "R12";	break;
				case REG_R13: reg[i] = "R13";	break;
				case REG_R14: reg[i] = "R14";	break;
				case REG_R15: reg[i] = "R15";	break;
			}
		}
		switch (is_ind) {
			case 0: sprintf(opr[i], "%s%s%s", idx[i], sign[i], address[i]); break;
			case 1: sprintf(opr[i], "%s%s(%s)", idx[i], sign[i], address[i]); break;
			case 2: sprintf(opr[i], "(%s%s%s)", idx[i], sign[i], address[i]); break;
			case 3: sprintf(opr[i], "#$%0*"PRIX64, rs*2, val); break;
			case 4: sprintf(opr[i], "%s", reg[i]); break;
		}
	}
	char *cc = "";
	char *op2 = "";
	int op_count;
	char *os = ""; /* Ortho Suffix. */
	if (is_os(opcode, op)) {
		os = (postfix && postfix[0] == '.') ? "O" : ".O";
	}
	if (is_1cc(opcode) || is_2op(opcode)) {
		op_count = 2;
	} else if (is_1op(opcode)) {
		op_count = 1;
	}
	if (is_1cc(opcode)) {
		switch (opcode) {
			case ORTHO_1CC(SET, NG): cc = "NG"; break;
			case ORTHO_1CC(SET, PO): cc = "PO"; break;
			case ORTHO_1CC(SET, CS): cc = "CS"; break;
			case ORTHO_1CC(SET, CC): cc = "CC"; break;
			case ORTHO_1CC(SET, EQ): cc = "EQ"; break;
			case ORTHO_1CC(SET, NE): cc = "NE"; break;
			case ORTHO_1CC(SET, VS): cc = "VS"; break;
			case ORTHO_1CC(SET, VC): cc = "VC"; break;
		}
		op2 = cc;
	} else if (is_2op(opcode)) {
		op2 = opr[1];
	}
	wprintw(scr, "%s%s%s %s%s %s", inst_name, postfix, os, opr[0], (op_count == 2) ? "," : "", op2);
	wmove(scr, 29, 0);
	wclrtoeol(scr);
	for (int i = 0; i < 2; i++) {
		if (op[i].type) {
			sprintf(address[i], "$%04"PRIX64, value[i]);
		} else {
			sprintf(address[i], "none");
		}
	}
	wprintw(scr, "destination address: %s, source address: %s", address[0], address[1]);
}


void disasm(struct sux *cpu, uint8_t lines, uint8_t opcode, uint8_t prefix, uint8_t ext_prefix, uint8_t prefix2, uint8_t *op_type, uint8_t *op_id, uint8_t thread) {
	uint64_t value;
	uint64_t address = 0;
	operand ortho_op[2];
	uint64_t ortho_addr[2] = {0, 0};
	if (ext_prefix != 0x1D) {
		address = get_addr(cpu, opcode, prefix, ext_prefix, 0, 0, thread);
	} else {
		get_ortho_addr(cpu, prefix, cpu->pc, ortho_op, ortho_addr, op_type, op_id, 0, 0, thread);
	}
	uint8_t rs = (prefix >> 4) & 3;
	char *postfix;
	char *of;
	char op[4];
	char *sign = "";
	char *ind  = "";
	uint8_t tmp = 0;
	union reg mask;
	mask.u64 = 0;
	const char *inst_name;
	uint8_t inst_type;
	op[3] = 0;
	switch (rs) {
		case 0: postfix = ""; break;
		case 1: postfix = ".W"; break;
		case 2: postfix = ".D"; break;
		case 3: postfix = ".Q"; break;
	}
	if (prefix >> 6) {
		tmp = 0;
	}
	switch (prefix >> 6) {
		default: of = ""; break;
		case 1 : of = "SP"; break;
		case 2 : of = "PC"; break;
	}
	if (ext_prefix != 0x1D) {
		if ((ext_prefix & 0xF) == 0xD) {
			switch (ext_prefix >> 4) {
				case 0x0: inst_name = ext_opname[opcode]; inst_type = ext_optype[opcode]; break;
			}
		} else {
			inst_name = opname[opcode];
			inst_type = optype[opcode];
		}
		memcpy(op, inst_name, 3);

		char *idx;
		uint8_t addrsize = 0;
		switch (inst_type) {
			case AIND : case IND : idx =    ")"; break;
			case AINDX: case INDX: idx = ", x)"; break;
			case AINDY: case INDY: idx = "), y"; break;
			case ABSX : case ZMX : idx =  ", x"; break;
			case ABSY : case ZMY : idx =  ", y"; break;
			default: idx = ""; break;
		}
		switch (inst_type) {
			case ZM   :
			case ZMX  :
			case ZMY  :
			case IND  :
			case INDX :
			case INDY : addrsize = get_addrsize(prefix,  ZM); break;
			case ABS  :
			case AIND :
			case AINDX:
			case AINDY:
			case ABSX :
			case ABSY : addrsize = get_addrsize(prefix, ABS); break;
			case IMM  :
			case REL  : addrsize = (1 << rs)-1; break;
		}
		mask.u64 = (-(uint64_t)1 >> ((7 - addrsize) * 8));
		value = read_value(cpu, 0, cpu->pc, addrsize, 0, 0);
		if ((prefix >> 6) == 1 || (prefix >> 6) == 2 || inst_type == REL) {
			switch (addrsize) {
				case 0 : sign = ((int8_t )value < 0) ? "-" : "+"; break;
				case 1 : sign = ((int16_t)value < 0) ? "-" : "+"; break;
				case 2 :
				case 3 : sign = ((int32_t)value < 0) ? "-" : "+"; break;
				case 4 :
				case 5 :
				case 6 :
				case 7 : sign = ((int64_t)value < 0) ? "-" : "+"; break;
			}
			value = (sign[0] == '-') ? (~value + 1) & mask.u64 : value;
		}
		switch (inst_type) {
			case BREG :
			case IMPL : wprintw(scr, "%s%s" , inst_name, postfix); break;
			case EIND : wprintw(scr, "%s%s (E)" , op, postfix); break;
			case IMM  : wprintw(scr, "%s%s #$%0*"PRIX64 , op, postfix, (addrsize+1) << 1, value); break;
			case AIND :
			case AINDX:
			case AINDY:
			case IND  :
			case INDX :
			case INDY : ind = "("; /* Falls through. */
			case ZMX  :
			case ZMY  :
			case ABSX :
			case ABSY :
			case ZM   :
			case ABS  : wprintw(scr, "%s%s %s%s%s$%0*" PRIX64"%s" , op, postfix, ind, of, sign, (addrsize+1) << 1, value, idx); break;
			case REL  : wprintw(scr, "%s%s %s$%0*"PRIX64 , op, postfix, sign, (addrsize+1) << 1, value); break;
		}
	} else {
		inst_name = ortho_opname[opcode];
		memcpy(op, inst_name, 3);
		disasm_ortho(cpu, opcode, prefix, prefix2, ortho_addr, op, postfix, ortho_op, (1 << rs), thread);
	}

	if (address == TX_ADDR || address == RX_ADDR) {
		wmove(scr, 27, 0);
		wprintw(scr, "TX_ADDR: $%02X, RX_ADDR: $%02X", addr[TX_ADDR], addr[RX_ADDR]);
	}
	if (ext_prefix != 0x1D) {
		wmove(scr, 29, 0);
		wclrtoeol(scr);
		wprintw(scr, "address: $%04"PRIX64, address);
	}
	if (subdbg) {
		uint8_t ln = 33;
		uint16_t line_idx = 0;
		uint32_t tmpad = 0x20247;
		int row, col;
		uint8_t iscursor = 0;
		union reg ptr;
		ptr.u64 = 0;
		uint32_t adr;
		if (address == CTRL_ADDR || addr[STEP_ADDR]) {
			adr = read_value(cpu, 0, tmpad, 7, 0, 0);
			tmpad += 8;
			wprintw(scr, ", scr_row: %02u, scr_col: %02u, scr_str: %02u, scr_end: %02u", addr[0], addr[1], addr[2], addr[3]);
			wmove(scr, 32, 0);
			wprintw(scr, "bitabl: ");
			for (uint8_t i = 0; i < 16; i++) {
				wprintw(scr, "%s", showbits(addr[adr+i], 7, 0));
			}
			mvwprintw(scr, ln++, 0, "buffer: ");
			wmove(scr, ln++, 0);
			uint8_t maxrow = 10;
			int line_offset = (addr[0]-(maxrow-1) >= 0) ? addr[0]-(maxrow-1) : 0;
			adr = read_value(cpu, 0, tmpad, 7, 0, 0);
			for (uint8_t i = 0; i < maxrow; i++) {
				line_idx = (i+addr[2]+line_offset << 6) + (i+addr[2]+line_offset << 4);
				for (uint8_t j = 0; j < 0x50; j++) {
					wprintw(scr, "%02X", addr[adr+j+line_idx]);
						if ((addr[0] == i+line_offset) && addr[1] == j) {
							iscursor=1;
							getyx(scr,row, col);
							wmove(scr, ln++, 0);
							wclrtoeol(scr);
							wmove(scr, row+1, col-2);
							wprintw(scr, "/\\");
							wmove(scr, row, col);
						}
				}
				wprintw(scr, ", i: %02X", i);
				if (!iscursor) {
					wmove(scr, ln, 0);
					wclrtoeol(scr);
				}
				iscursor = 0;
				wmove(scr, ln++, 0);
			}
		}
		/*wclrtoeol(scr);
		wprintw(scr, "rega: $%02X, ", addr[0x0A]);
		wprintw(scr, "regb: $%02X, ", addr[0x0B]);
		wprintw(scr, "regc: $%02X, ", addr[0x0C]);
		wprintw(scr, "regd: $%02X, ", addr[0x0D]);
		wprintw(scr, "rege: $%02X, ", addr[0x0E]);
		wprintw(scr, "regf: $%02X, ", addr[0x0F]);
		wprintw(scr, "regg: $%02X", addr[0x10]);*/

		wmove(scr, 30, 0);
		wclrtoeol(scr);

		adr = 0x25;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, "ptr1: $%04"PRIX64, ptr.u64);

		adr = 0x2D;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, ", ptr2: $%04"PRIX64, ptr.u64);

		adr = 0x35;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, ", ptr3: $%04"PRIX64, ptr.u64);

		adr = 0x02049A;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, ", idx0: $%04"PRIX64, ptr.u64);

		adr = 0x334BA;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, ", valbuf: $%016"PRIX64, ptr.u64);


		wmove(scr, 31, 0);
		wclrtoeol(scr);
		adr = 0x200CA;
		ptr.u64 = read_value(cpu, 0, adr, 3, 0, 0);
		wprintw(scr, "t_id: $%02X", ptr.u8[0]);
		wprintw(scr, ", t_type: $%02X", ptr.u8[1]);
		wprintw(scr, ", t_space: $%02X", ptr.u8[2]);
		wprintw(scr, ", t_tab: $%02X", ptr.u8[3]);
		adr += 4;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, ", t_val: $%"PRIX64, ptr.u64);
		adr += 8;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, ", t_str: $%"PRIX64, ptr.u64);
		adr += 8;
		ptr.u64 = read_value(cpu, 0, adr, 7, 0, 0);
		wprintw(scr, ", t_sym: $%"PRIX64, ptr.u64);


		/*
		wmove(scr, 47, 0);
		wclrtoeol(scr);
		wprintw(scr, "a: $%02X,",  addr[0x0A]);
		wprintw(scr, " b: $%02X,", addr[0x0B]);
		wprintw(scr, " c: $%02X,", addr[0x0C]);
		wprintw(scr, " d: $%02X,", addr[0x0D]);
		wprintw(scr, " e: $%02X,", addr[0x0E]);
		wprintw(scr, " f: $%02X",  addr[0x0F]);
		tmpad += 8;
		adr = read_value(cpu, 0, tmpad, 7, 0, 0);
		line_idx = 0;
		wprintw(scr, "cmd_buf:");
		for (uint8_t i = 0; i < 1; i++) {
			wmove(scr, ln++, 0);
			wclrtoeol(scr);
			line_idx = (i << 4)+(i << 6);
			for (uint8_t j = 0; j < 0x50; j++) {
				wprintw(scr, "%02X", addr[adr+j+line_idx]);
			}
			wprintw(scr, ", i: %02X", i);
		}*/

	}
}

#undef ORTHO_1CC
#undef ORTHO_1OP
#undef ORTHO_2OP