[pcsx_rearmed.git] / deps / lightrec / disassembler.c

// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2014-2021 Paul Cercueil <paul@crapouillou.net>
 */

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "lightrec-private.h"
#include "regcache.h"

static const char * const std_opcodes[] = {
	[OP_J]			= "j       ",
	[OP_JAL]		= "jal     ",
	[OP_BEQ]		= "beq     ",
	[OP_BNE]		= "bne     ",
	[OP_BLEZ]		= "blez    ",
	[OP_BGTZ]		= "bgtz    ",
	[OP_ADDI]		= "addi    ",
	[OP_ADDIU]		= "addiu   ",
	[OP_SLTI]		= "slti    ",
	[OP_SLTIU]		= "sltiu   ",
	[OP_ANDI]		= "andi    ",
	[OP_ORI]		= "ori     ",
	[OP_XORI]		= "xori    ",
	[OP_LUI]		= "lui     ",
	[OP_LB]			= "lb      ",
	[OP_LH]			= "lh      ",
	[OP_LWL]		= "lwl     ",
	[OP_LW]			= "lw      ",
	[OP_LBU]		= "lbu     ",
	[OP_LHU]		= "lhu     ",
	[OP_LWR]		= "lwr     ",
	[OP_SB]			= "sb      ",
	[OP_SH]			= "sh      ",
	[OP_SWL]		= "swl     ",
	[OP_SW]			= "sw      ",
	[OP_SWR]		= "swr     ",
	[OP_LWC2]		= "lwc2    ",
	[OP_SWC2]		= "swc2    ",
};

static const char * const special_opcodes[] = {
	[OP_SPECIAL_SLL]	= "sll     ",
	[OP_SPECIAL_SRL]	= "srl     ",
	[OP_SPECIAL_SRA]	= "sra     ",
	[OP_SPECIAL_SLLV]	= "sllv    ",
	[OP_SPECIAL_SRLV]	= "srlv    ",
	[OP_SPECIAL_SRAV]	= "srav    ",
	[OP_SPECIAL_JR]		= "jr      ",
	[OP_SPECIAL_JALR]	= "jalr    ",
	[OP_SPECIAL_SYSCALL]	= "syscall ",
	[OP_SPECIAL_BREAK]	= "break   ",
	[OP_SPECIAL_MFHI]	= "mfhi    ",
	[OP_SPECIAL_MTHI]	= "mthi    ",
	[OP_SPECIAL_MFLO]	= "mflo    ",
	[OP_SPECIAL_MTLO]	= "mtlo    ",
	[OP_SPECIAL_MULT]	= "mult    ",
	[OP_SPECIAL_MULTU]	= "multu   ",
	[OP_SPECIAL_DIV]	= "div     ",
	[OP_SPECIAL_DIVU]	= "divu    ",
	[OP_SPECIAL_ADD]	= "add     ",
	[OP_SPECIAL_ADDU]	= "addu    ",
	[OP_SPECIAL_SUB]	= "sub     ",
	[OP_SPECIAL_SUBU]	= "subu    ",
	[OP_SPECIAL_AND]	= "and     ",
	[OP_SPECIAL_OR]		= "or      ",
	[OP_SPECIAL_XOR]	= "xor     ",
	[OP_SPECIAL_NOR]	= "nor     ",
	[OP_SPECIAL_SLT]	= "slt     ",
	[OP_SPECIAL_SLTU]	= "sltu    ",
};

static const char * const regimm_opcodes[] = {
	[OP_REGIMM_BLTZ]	= "bltz    ",
	[OP_REGIMM_BGEZ]	= "bgez    ",
	[OP_REGIMM_BLTZAL]	= "bltzal  ",
	[OP_REGIMM_BGEZAL]	= "bgezal  ",
};

static const char * const cp0_opcodes[] = {
	[OP_CP0_MFC0]		= "mfc0    ",
	[OP_CP0_CFC0]		= "cfc0    ",
	[OP_CP0_MTC0]		= "mtc0    ",
	[OP_CP0_CTC0]		= "ctc0    ",
	[OP_CP0_RFE]		= "rfe",
};

static const char * const cp2_basic_opcodes[] = {
	[OP_CP2_BASIC_MFC2]	= "mfc2    ",
	[OP_CP2_BASIC_CFC2]	= "cfc2    ",
	[OP_CP2_BASIC_MTC2]	= "mtc2    ",
	[OP_CP2_BASIC_CTC2]	= "ctc2    ",
};

static const char * const cp2_opcodes[] = {
	[OP_CP2_RTPS]		= "rtps    ",
	[OP_CP2_NCLIP]		= "nclip   ",
	[OP_CP2_OP]		= "op      ",
	[OP_CP2_DPCS]		= "dpcs    ",
	[OP_CP2_INTPL]		= "intpl   ",
	[OP_CP2_MVMVA]		= "mvmva   ",
	[OP_CP2_NCDS]		= "ncds    ",
	[OP_CP2_CDP]		= "cdp     ",
	[OP_CP2_NCDT]		= "ncdt    ",
	[OP_CP2_NCCS]		= "nccs    ",
	[OP_CP2_CC]		= "cc      ",
	[OP_CP2_NCS]		= "ncs     ",
	[OP_CP2_NCT]		= "nct     ",
	[OP_CP2_SQR]		= "sqr     ",
	[OP_CP2_DCPL]		= "dcpl    ",
	[OP_CP2_DPCT]		= "dpct    ",
	[OP_CP2_AVSZ3]		= "avsz3   ",
	[OP_CP2_AVSZ4]		= "avsz4   ",
	[OP_CP2_RTPT]		= "rtpt    ",
	[OP_CP2_GPF]		= "gpf     ",
	[OP_CP2_GPL]		= "gpl     ",
	[OP_CP2_NCCT]		= "ncct    ",
};

static const char * const mult2_opcodes[] = {
	"mult2   ", "multu2  ",
};

static const char * const opcode_flags[] = {
	"switched branch/DS",
	"sync point",
};

static const char * const opcode_io_flags[] = {
	"self-modifying code",
	"no invalidation",
	"no mask",
};

static const char * const opcode_io_modes[] = {
	"Memory access",
	"I/O access",
	"RAM access",
	"BIOS access",
	"Scratchpad access",
	"Mapped I/O access"
};

static const char * const opcode_branch_flags[] = {
	"emulate branch",
	"local branch",
};

static const char * const opcode_multdiv_flags[] = {
	"No LO",
	"No HI",
	"No div check",
};

static size_t do_snprintf(char *buf, size_t len, bool *first,
			  const char *arg1, const char *arg2)
{
	size_t bytes;

	if (*first)
		bytes = snprintf(buf, len, "(%s%s", arg1, arg2);
	else
		bytes = snprintf(buf, len, ", %s%s", arg1, arg2);

	*first = false;

	return bytes;
}

static const char * const reg_op_token[3] = {
	"-", "*", "~",
};

static int print_flags(char *buf, size_t len, const struct opcode *op,
		       const char * const *array, size_t array_size,
		       bool is_io)
{
	const char *flag_name, *io_mode_name;
	unsigned int i, io_mode;
	size_t count = 0, bytes;
	bool first = true;
	u32 flags = op->flags;
	unsigned int reg_op;

	for (i = 0; i < array_size + ARRAY_SIZE(opcode_flags); i++) {
		if (!(flags & BIT(i)))
			continue;

		if (i < ARRAY_SIZE(opcode_flags))
			flag_name = opcode_flags[i];
		else
			flag_name = array[i - ARRAY_SIZE(opcode_flags)];

		bytes = do_snprintf(buf, len, &first, "", flag_name);
		buf += bytes;
		len -= bytes;
		count += bytes;
	}

	if (is_io) {
		io_mode = LIGHTREC_FLAGS_GET_IO_MODE(flags);
		if (io_mode > 0) {
			io_mode_name = opcode_io_modes[io_mode - 1];

			bytes = do_snprintf(buf, len, &first, "", io_mode_name);
			buf += bytes;
			len -= bytes;
			count += bytes;
		}
	}

	if (OPT_EARLY_UNLOAD) {
		reg_op = LIGHTREC_FLAGS_GET_RS(flags);
		if (reg_op) {
			bytes = do_snprintf(buf, len, &first,
					    reg_op_token[reg_op - 1],
					    lightrec_reg_name(op->i.rs));
			buf += bytes;
			len -= bytes;
			count += bytes;
		}

		reg_op = LIGHTREC_FLAGS_GET_RT(flags);
		if (reg_op) {
			bytes = do_snprintf(buf, len, &first,
					    reg_op_token[reg_op - 1],
					    lightrec_reg_name(op->i.rt));
			buf += bytes;
			len -= bytes;
			count += bytes;
		}

		reg_op = LIGHTREC_FLAGS_GET_RD(flags);
		if (reg_op) {
			bytes = do_snprintf(buf, len, &first,
					    reg_op_token[reg_op - 1],
					    lightrec_reg_name(op->r.rd));
			buf += bytes;
			len -= bytes;
			count += bytes;
		}
	}

	if (!first)
		count += snprintf(buf, len, ")");
	else
		*buf = '\0';

	return count;
}

static int print_op_special(union code c, char *buf, size_t len,
			    const char * const **flags_ptr, size_t *nb_flags)
{
	switch (c.r.op) {
	case OP_SPECIAL_SLL:
	case OP_SPECIAL_SRL:
	case OP_SPECIAL_SRA:
		return snprintf(buf, len, "%s%s,%s,%u",
				special_opcodes[c.r.op],
				lightrec_reg_name(c.r.rd),
				lightrec_reg_name(c.r.rt),
				c.r.imm);
	case OP_SPECIAL_SLLV:
	case OP_SPECIAL_SRLV:
	case OP_SPECIAL_SRAV:
	case OP_SPECIAL_ADD:
	case OP_SPECIAL_ADDU:
	case OP_SPECIAL_SUB:
	case OP_SPECIAL_SUBU:
	case OP_SPECIAL_AND:
	case OP_SPECIAL_OR:
	case OP_SPECIAL_XOR:
	case OP_SPECIAL_NOR:
	case OP_SPECIAL_SLT:
	case OP_SPECIAL_SLTU:
		return snprintf(buf, len, "%s%s,%s,%s",
				special_opcodes[c.r.op],
				lightrec_reg_name(c.r.rd),
				lightrec_reg_name(c.r.rt),
				lightrec_reg_name(c.r.rs));
	case OP_SPECIAL_JR:
		*flags_ptr = opcode_branch_flags;
		*nb_flags = ARRAY_SIZE(opcode_branch_flags);
		fallthrough;
	case OP_SPECIAL_MTHI:
	case OP_SPECIAL_MTLO:
		return snprintf(buf, len, "%s%s",
				special_opcodes[c.r.op],
				lightrec_reg_name(c.r.rs));
	case OP_SPECIAL_JALR:
		return snprintf(buf, len, "%s%s,%s",
				special_opcodes[c.r.op],
				lightrec_reg_name(c.r.rd),
				lightrec_reg_name(c.r.rt));
	case OP_SPECIAL_SYSCALL:
	case OP_SPECIAL_BREAK:
		return snprintf(buf, len, "%s", special_opcodes[c.r.op]);
	case OP_SPECIAL_MFHI:
	case OP_SPECIAL_MFLO:
		return snprintf(buf, len, "%s%s",
				special_opcodes[c.r.op],
				lightrec_reg_name(c.r.rd));
	case OP_SPECIAL_MULT:
	case OP_SPECIAL_MULTU:
	case OP_SPECIAL_DIV:
	case OP_SPECIAL_DIVU:
		*flags_ptr = opcode_multdiv_flags;
		*nb_flags = ARRAY_SIZE(opcode_multdiv_flags);
		return snprintf(buf, len, "%s%s,%s,%s,%s",
				special_opcodes[c.r.op],
				lightrec_reg_name(get_mult_div_hi(c)),
				lightrec_reg_name(get_mult_div_lo(c)),
				lightrec_reg_name(c.r.rs),
				lightrec_reg_name(c.r.rt));
	default:
		return snprintf(buf, len, "unknown (0x%08x)", c.opcode);
	}
}

static int print_op_cp(union code c, char *buf, size_t len, unsigned int cp)
{
	if (cp == 2) {
		switch (c.r.op) {
		case OP_CP2_BASIC:
			return snprintf(buf, len, "%s%s,%u",
					cp2_basic_opcodes[c.i.rs],
					lightrec_reg_name(c.i.rt),
					c.r.rd);
		default:
			return snprintf(buf, len, "%s", cp2_opcodes[c.r.op]);
		}
	} else {
		switch (c.i.rs) {
		case OP_CP0_MFC0:
		case OP_CP0_CFC0:
		case OP_CP0_MTC0:
		case OP_CP0_CTC0:
			return snprintf(buf, len, "%s%s,%u",
					cp0_opcodes[c.i.rs],
					lightrec_reg_name(c.i.rt),
					c.r.rd);
		case OP_CP0_RFE:
			return snprintf(buf, len, "rfe     ");
		default:
			return snprintf(buf, len, "unknown (0x%08x)", c.opcode);
		}
	}
}

static int print_op(union code c, u32 pc, char *buf, size_t len,
		    const char * const **flags_ptr, size_t *nb_flags,
		    bool *is_io)
{
	if (c.opcode == 0)
		return snprintf(buf, len, "nop     ");

	switch (c.i.op) {
	case OP_SPECIAL:
		return print_op_special(c, buf, len, flags_ptr, nb_flags);
	case OP_REGIMM:
		*flags_ptr = opcode_branch_flags;
		*nb_flags = ARRAY_SIZE(opcode_branch_flags);
		return snprintf(buf, len, "%s%s,0x%x",
				regimm_opcodes[c.i.rt],
				lightrec_reg_name(c.i.rs),
				pc + 4 + ((s16)c.i.imm << 2));
	case OP_J:
	case OP_JAL:
		*flags_ptr = opcode_branch_flags;
		*nb_flags = ARRAY_SIZE(opcode_branch_flags);
		return snprintf(buf, len, "%s0x%x",
				std_opcodes[c.i.op],
				(pc & 0xf0000000) | (c.j.imm << 2));
	case OP_BEQ:
		if (c.i.rs == c.i.rt) {
			*flags_ptr = opcode_branch_flags;
			*nb_flags = ARRAY_SIZE(opcode_branch_flags);
			return snprintf(buf, len, "b       0x%x",
					pc + 4 + ((s16)c.i.imm << 2));
		}
		fallthrough;
	case OP_BNE:
	case OP_BLEZ:
	case OP_BGTZ:
		*flags_ptr = opcode_branch_flags;
		*nb_flags = ARRAY_SIZE(opcode_branch_flags);
		return snprintf(buf, len, "%s%s,%s,0x%x",
				std_opcodes[c.i.op],
				lightrec_reg_name(c.i.rs),
				lightrec_reg_name(c.i.rt),
				pc + 4 + ((s16)c.i.imm << 2));
	case OP_ADDI:
	case OP_ADDIU:
	case OP_SLTI:
	case OP_SLTIU:
	case OP_ANDI:
	case OP_ORI:
	case OP_XORI:
		return snprintf(buf, len, "%s%s,%s,0x%04hx",
				std_opcodes[c.i.op],
				lightrec_reg_name(c.i.rt),
				lightrec_reg_name(c.i.rs),
				(u16)c.i.imm);

	case OP_LUI:
		return snprintf(buf, len, "%s%s,0x%04hx",
				std_opcodes[c.i.op],
				lightrec_reg_name(c.i.rt),
				(u16)c.i.imm);
	case OP_CP0:
		return print_op_cp(c, buf, len, 0);
	case OP_CP2:
		return print_op_cp(c, buf, len, 2);
	case OP_LB:
	case OP_LH:
	case OP_LWL:
	case OP_LW:
	case OP_LBU:
	case OP_LHU:
	case OP_LWR:
	case OP_SB:
	case OP_SH:
	case OP_SWL:
	case OP_SW:
	case OP_SWR:
		*flags_ptr = opcode_io_flags;
		*nb_flags = ARRAY_SIZE(opcode_io_flags);
		*is_io = true;
		return snprintf(buf, len, "%s%s,%hd(%s)",
				std_opcodes[c.i.op],
				lightrec_reg_name(c.i.rt),
				(s16)c.i.imm,
				lightrec_reg_name(c.i.rs));
	case OP_LWC2:
	case OP_SWC2:
		*flags_ptr = opcode_io_flags;
		*nb_flags = ARRAY_SIZE(opcode_io_flags);
		return snprintf(buf, len, "%s%s,%hd(%s)",
				std_opcodes[c.i.op],
				lightrec_reg_name(c.i.rt),
				(s16)c.i.imm,
				lightrec_reg_name(c.i.rs));
	case OP_META_MOV:
		return snprintf(buf, len, "move    %s,%s",
				lightrec_reg_name(c.r.rd),
				lightrec_reg_name(c.r.rs));
	case OP_META_EXTC:
		return snprintf(buf, len, "extc    %s,%s",
				lightrec_reg_name(c.i.rt),
				lightrec_reg_name(c.i.rs));
	case OP_META_EXTS:
		return snprintf(buf, len, "exts    %s,%s",
				lightrec_reg_name(c.i.rt),
				lightrec_reg_name(c.i.rs));
	case OP_META_MULT2:
	case OP_META_MULTU2:
		*flags_ptr = opcode_multdiv_flags;
		*nb_flags = ARRAY_SIZE(opcode_multdiv_flags);
		return snprintf(buf, len, "%s%s,%s,%s,%u",
				mult2_opcodes[c.i.op == OP_META_MULTU2],
				lightrec_reg_name(get_mult_div_hi(c)),
				lightrec_reg_name(get_mult_div_lo(c)),
				lightrec_reg_name(c.r.rs), c.r.op);
	default:
		return snprintf(buf, len, "unknown (0x%08x)", c.opcode);
	}
}

void lightrec_print_disassembly(const struct block *block, const u32 *code_ptr)
{
	const struct opcode *op;
	const char * const *flags_ptr;
	size_t nb_flags, count, count2;
	char buf[256], buf2[256], buf3[256];
	unsigned int i;
	u32 pc, branch_pc, code;
	bool is_io;

	for (i = 0; i < block->nb_ops; i++) {
		op = &block->opcode_list[i];
		branch_pc = get_branch_pc(block, i, 0);
		pc = block->pc + (i << 2);
		code = LE32TOH(code_ptr[i]);

		count = print_op((union code)code, pc, buf, sizeof(buf),
				 &flags_ptr, &nb_flags, &is_io);

		flags_ptr = NULL;
		nb_flags = 0;
		is_io = false;
		count2 = print_op(op->c, branch_pc, buf2, sizeof(buf2),
				  &flags_ptr, &nb_flags, &is_io);

		if (code == op->c.opcode) {
			*buf2 = '\0';
			count2 = 0;
		}

		print_flags(buf3, sizeof(buf3), op, flags_ptr, nb_flags, is_io);

		printf("0x%08x (0x%x)\t%s%*c%s%*c%s\n", pc, i << 2,
		       buf, 30 - (int)count, ' ', buf2, 30 - (int)count2, ' ', buf3);
	}
}
Commit	Line	Data
98fa08a5	1	// SPDX-License-Identifier: LGPL-2.1-or-later
d16005f8	2	/*
98fa08a5	3	* Copyright (C) 2014-2021 Paul Cercueil <paul@crapouillou.net>
d16005f8 PC	4	*/
d16005f8 PC	5
d16005f8	6	#include <stdbool.h>
98fa08a5	7	#include <stdio.h>
d16005f8 PC	8	#include <stdlib.h>
	9	#include <string.h>
	10
d16005f8	11	#include "lightrec-private.h"
98fa08a5	12	#include "regcache.h"
d16005f8	13
ba3814c1	14	static const char * const std_opcodes[] = {
98fa08a5 PC	15	[OP_J] = "j ",
	16	[OP_JAL] = "jal ",
	17	[OP_BEQ] = "beq ",
	18	[OP_BNE] = "bne ",
	19	[OP_BLEZ] = "blez ",
	20	[OP_BGTZ] = "bgtz ",
	21	[OP_ADDI] = "addi ",
	22	[OP_ADDIU] = "addiu ",
	23	[OP_SLTI] = "slti ",
	24	[OP_SLTIU] = "sltiu ",
	25	[OP_ANDI] = "andi ",
	26	[OP_ORI] = "ori ",
	27	[OP_XORI] = "xori ",
	28	[OP_LUI] = "lui ",
	29	[OP_LB] = "lb ",
	30	[OP_LH] = "lh ",
	31	[OP_LWL] = "lwl ",
	32	[OP_LW] = "lw ",
	33	[OP_LBU] = "lbu ",
	34	[OP_LHU] = "lhu ",
	35	[OP_LWR] = "lwr ",
	36	[OP_SB] = "sb ",
	37	[OP_SH] = "sh ",
	38	[OP_SWL] = "swl ",
	39	[OP_SW] = "sw ",
	40	[OP_SWR] = "swr ",
	41	[OP_LWC2] = "lwc2 ",
	42	[OP_SWC2] = "swc2 ",
	43	};
d16005f8	44
ba3814c1	45	static const char * const special_opcodes[] = {
98fa08a5 PC	46	[OP_SPECIAL_SLL] = "sll ",
	47	[OP_SPECIAL_SRL] = "srl ",
	48	[OP_SPECIAL_SRA] = "sra ",
	49	[OP_SPECIAL_SLLV] = "sllv ",
	50	[OP_SPECIAL_SRLV] = "srlv ",
	51	[OP_SPECIAL_SRAV] = "srav ",
	52	[OP_SPECIAL_JR] = "jr ",
	53	[OP_SPECIAL_JALR] = "jalr ",
	54	[OP_SPECIAL_SYSCALL] = "syscall ",
	55	[OP_SPECIAL_BREAK] = "break ",
	56	[OP_SPECIAL_MFHI] = "mfhi ",
	57	[OP_SPECIAL_MTHI] = "mthi ",
	58	[OP_SPECIAL_MFLO] = "mflo ",
	59	[OP_SPECIAL_MTLO] = "mtlo ",
	60	[OP_SPECIAL_MULT] = "mult ",
	61	[OP_SPECIAL_MULTU] = "multu ",
	62	[OP_SPECIAL_DIV] = "div ",
	63	[OP_SPECIAL_DIVU] = "divu ",
	64	[OP_SPECIAL_ADD] = "add ",
	65	[OP_SPECIAL_ADDU] = "addu ",
	66	[OP_SPECIAL_SUB] = "sub ",
	67	[OP_SPECIAL_SUBU] = "subu ",
	68	[OP_SPECIAL_AND] = "and ",
	69	[OP_SPECIAL_OR] = "or ",
	70	[OP_SPECIAL_XOR] = "xor ",
	71	[OP_SPECIAL_NOR] = "nor ",
	72	[OP_SPECIAL_SLT] = "slt ",
	73	[OP_SPECIAL_SLTU] = "sltu ",
	74	};
d16005f8	75
ba3814c1	76	static const char * const regimm_opcodes[] = {
98fa08a5 PC	77	[OP_REGIMM_BLTZ] = "bltz ",
	78	[OP_REGIMM_BGEZ] = "bgez ",
	79	[OP_REGIMM_BLTZAL] = "bltzal ",
	80	[OP_REGIMM_BGEZAL] = "bgezal ",
	81	};
d16005f8	82
ba3814c1	83	static const char * const cp0_opcodes[] = {
98fa08a5 PC	84	[OP_CP0_MFC0] = "mfc0 ",
	85	[OP_CP0_CFC0] = "cfc0 ",
	86	[OP_CP0_MTC0] = "mtc0 ",
	87	[OP_CP0_CTC0] = "ctc0 ",
	88	[OP_CP0_RFE] = "rfe",
	89	};
	90
ba3814c1	91	static const char * const cp2_basic_opcodes[] = {
98fa08a5 PC	92	[OP_CP2_BASIC_MFC2] = "mfc2 ",
	93	[OP_CP2_BASIC_CFC2] = "cfc2 ",
	94	[OP_CP2_BASIC_MTC2] = "mtc2 ",
	95	[OP_CP2_BASIC_CTC2] = "ctc2 ",
	96	};
	97
ba3814c1 PC	98	static const char * const cp2_opcodes[] = {
	99	[OP_CP2_RTPS] = "rtps ",
	100	[OP_CP2_NCLIP] = "nclip ",
	101	[OP_CP2_OP] = "op ",
	102	[OP_CP2_DPCS] = "dpcs ",
	103	[OP_CP2_INTPL] = "intpl ",
	104	[OP_CP2_MVMVA] = "mvmva ",
	105	[OP_CP2_NCDS] = "ncds ",
	106	[OP_CP2_CDP] = "cdp ",
	107	[OP_CP2_NCDT] = "ncdt ",
	108	[OP_CP2_NCCS] = "nccs ",
	109	[OP_CP2_CC] = "cc ",
	110	[OP_CP2_NCS] = "ncs ",
	111	[OP_CP2_NCT] = "nct ",
	112	[OP_CP2_SQR] = "sqr ",
	113	[OP_CP2_DCPL] = "dcpl ",
	114	[OP_CP2_DPCT] = "dpct ",
	115	[OP_CP2_AVSZ3] = "avsz3 ",
	116	[OP_CP2_AVSZ4] = "avsz4 ",
	117	[OP_CP2_RTPT] = "rtpt ",
	118	[OP_CP2_GPF] = "gpf ",
	119	[OP_CP2_GPL] = "gpl ",
	120	[OP_CP2_NCCT] = "ncct ",
	121	};
	122
	123	static const char * const mult2_opcodes[] = {
	124	"mult2 ", "multu2 ",
	125	};
	126
	127	static const char * const opcode_flags[] = {
98fa08a5	128	"switched branch/DS",
98fa08a5 PC	129	"sync point",
	130	};
	131
ba3814c1	132	static const char * const opcode_io_flags[] = {
98fa08a5 PC	133	"self-modifying code",
98fa08a5 PC	134	"no invalidation",
22eee2ac PC	135	"no mask",
	136	};
	137
ba3814c1	138	static const char * const opcode_io_modes[] = {
22eee2ac PC	139	"Memory access",
	140	"I/O access",
	141	"RAM access",
	142	"BIOS access",
	143	"Scratchpad access",
ba3814c1	144	"Mapped I/O access"
98fa08a5	145	};
d16005f8	146
ba3814c1	147	static const char * const opcode_branch_flags[] = {
98fa08a5 PC	148	"emulate branch",
	149	"local branch",
	150	};
	151
ba3814c1	152	static const char * const opcode_multdiv_flags[] = {
98fa08a5 PC	153	"No LO",
	154	"No HI",
	155	"No div check",
	156	};
	157
03535202 PC	158	static size_t do_snprintf(char buf, size_t len, bool first,
	159	const char arg1, const char arg2)
	160	{
	161	size_t bytes;
	162
	163	if (*first)
	164	bytes = snprintf(buf, len, "(%s%s", arg1, arg2);
	165	else
	166	bytes = snprintf(buf, len, ", %s%s", arg1, arg2);
	167
	168	*first = false;
	169
	170	return bytes;
	171	}
	172
	173	static const char * const reg_op_token[3] = {
	174	"-", "*", "~",
	175	};
	176
	177	static int print_flags(char buf, size_t len, const struct opcode op,
ba3814c1	178	const char * const *array, size_t array_size,
22eee2ac	179	bool is_io)
d16005f8	180	{
22eee2ac PC	181	const char flag_name, io_mode_name;
22eee2ac PC	182	unsigned int i, io_mode;
98fa08a5 PC	183	size_t count = 0, bytes;
98fa08a5 PC	184	bool first = true;
03535202 PC	185	u32 flags = op->flags;
03535202 PC	186	unsigned int reg_op;
d16005f8	187
98fa08a5 PC	188	for (i = 0; i < array_size + ARRAY_SIZE(opcode_flags); i++) {
	189	if (!(flags & BIT(i)))
	190	continue;
d16005f8	191
98fa08a5 PC	192	if (i < ARRAY_SIZE(opcode_flags))
98fa08a5 PC	193	flag_name = opcode_flags[i];
d16005f8	194	else
98fa08a5 PC	195	flag_name = array[i - ARRAY_SIZE(opcode_flags)];
98fa08a5 PC	196
03535202	197	bytes = do_snprintf(buf, len, &first, "", flag_name);
98fa08a5 PC	198	buf += bytes;
	199	len -= bytes;
	200	count += bytes;
d16005f8 PC	201	}
d16005f8 PC	202
22eee2ac PC	203	if (is_io) {
	204	io_mode = LIGHTREC_FLAGS_GET_IO_MODE(flags);
	205	if (io_mode > 0) {
	206	io_mode_name = opcode_io_modes[io_mode - 1];
	207
03535202 PC	208	bytes = do_snprintf(buf, len, &first, "", io_mode_name);
	209	buf += bytes;
	210	len -= bytes;
	211	count += bytes;
	212	}
	213	}
	214
	215	if (OPT_EARLY_UNLOAD) {
	216	reg_op = LIGHTREC_FLAGS_GET_RS(flags);
	217	if (reg_op) {
	218	bytes = do_snprintf(buf, len, &first,
	219	reg_op_token[reg_op - 1],
	220	lightrec_reg_name(op->i.rs));
	221	buf += bytes;
	222	len -= bytes;
	223	count += bytes;
	224	}
	225
	226	reg_op = LIGHTREC_FLAGS_GET_RT(flags);
	227	if (reg_op) {
	228	bytes = do_snprintf(buf, len, &first,
	229	reg_op_token[reg_op - 1],
	230	lightrec_reg_name(op->i.rt));
	231	buf += bytes;
	232	len -= bytes;
	233	count += bytes;
	234	}
22eee2ac	235
03535202 PC	236	reg_op = LIGHTREC_FLAGS_GET_RD(flags);
	237	if (reg_op) {
	238	bytes = do_snprintf(buf, len, &first,
	239	reg_op_token[reg_op - 1],
	240	lightrec_reg_name(op->r.rd));
22eee2ac PC	241	buf += bytes;
	242	len -= bytes;
	243	count += bytes;
	244	}
	245	}
	246
98fa08a5 PC	247	if (!first)
	248	count += snprintf(buf, len, ")");
	249	else
	250	*buf = '\0';
d16005f8	251
98fa08a5	252	return count;
d16005f8 PC	253	}
d16005f8 PC	254
98fa08a5	255	static int print_op_special(union code c, char *buf, size_t len,
ba3814c1	256	const char * const *flags_ptr, size_t nb_flags)
d16005f8	257	{
98fa08a5 PC	258	switch (c.r.op) {
	259	case OP_SPECIAL_SLL:
	260	case OP_SPECIAL_SRL:
	261	case OP_SPECIAL_SRA:
	262	return snprintf(buf, len, "%s%s,%s,%u",
	263	special_opcodes[c.r.op],
	264	lightrec_reg_name(c.r.rd),
	265	lightrec_reg_name(c.r.rt),
	266	c.r.imm);
	267	case OP_SPECIAL_SLLV:
	268	case OP_SPECIAL_SRLV:
	269	case OP_SPECIAL_SRAV:
	270	case OP_SPECIAL_ADD:
	271	case OP_SPECIAL_ADDU:
	272	case OP_SPECIAL_SUB:
	273	case OP_SPECIAL_SUBU:
	274	case OP_SPECIAL_AND:
	275	case OP_SPECIAL_OR:
	276	case OP_SPECIAL_XOR:
	277	case OP_SPECIAL_NOR:
	278	case OP_SPECIAL_SLT:
	279	case OP_SPECIAL_SLTU:
	280	return snprintf(buf, len, "%s%s,%s,%s",
	281	special_opcodes[c.r.op],
	282	lightrec_reg_name(c.r.rd),
	283	lightrec_reg_name(c.r.rt),
	284	lightrec_reg_name(c.r.rs));
	285	case OP_SPECIAL_JR:
d8b04acd PC	286	*flags_ptr = opcode_branch_flags;
	287	*nb_flags = ARRAY_SIZE(opcode_branch_flags);
	288	fallthrough;
98fa08a5 PC	289	case OP_SPECIAL_MTHI:
	290	case OP_SPECIAL_MTLO:
	291	return snprintf(buf, len, "%s%s",
	292	special_opcodes[c.r.op],
	293	lightrec_reg_name(c.r.rs));
	294	case OP_SPECIAL_JALR:
	295	return snprintf(buf, len, "%s%s,%s",
	296	special_opcodes[c.r.op],
	297	lightrec_reg_name(c.r.rd),
	298	lightrec_reg_name(c.r.rt));
	299	case OP_SPECIAL_SYSCALL:
	300	case OP_SPECIAL_BREAK:
	301	return snprintf(buf, len, "%s", special_opcodes[c.r.op]);
	302	case OP_SPECIAL_MFHI:
	303	case OP_SPECIAL_MFLO:
	304	return snprintf(buf, len, "%s%s",
	305	special_opcodes[c.r.op],
	306	lightrec_reg_name(c.r.rd));
	307	case OP_SPECIAL_MULT:
	308	case OP_SPECIAL_MULTU:
	309	case OP_SPECIAL_DIV:
	310	case OP_SPECIAL_DIVU:
	311	*flags_ptr = opcode_multdiv_flags;
	312	*nb_flags = ARRAY_SIZE(opcode_multdiv_flags);
	313	return snprintf(buf, len, "%s%s,%s,%s,%s",
	314	special_opcodes[c.r.op],
	315	lightrec_reg_name(get_mult_div_hi(c)),
	316	lightrec_reg_name(get_mult_div_lo(c)),
	317	lightrec_reg_name(c.r.rs),
	318	lightrec_reg_name(c.r.rt));
d16005f8	319	default:
98fa08a5	320	return snprintf(buf, len, "unknown (0x%08x)", c.opcode);
d16005f8 PC	321	}
	322	}
	323
98fa08a5	324	static int print_op_cp(union code c, char *buf, size_t len, unsigned int cp)
d16005f8	325	{
98fa08a5	326	if (cp == 2) {
ba3814c1 PC	327	switch (c.r.op) {
ba3814c1 PC	328	case OP_CP2_BASIC:
98fa08a5	329	return snprintf(buf, len, "%s%s,%u",
ba3814c1	330	cp2_basic_opcodes[c.i.rs],
98fa08a5 PC	331	lightrec_reg_name(c.i.rt),
	332	c.r.rd);
	333	default:
ba3814c1	334	return snprintf(buf, len, "%s", cp2_opcodes[c.r.op]);
98fa08a5 PC	335	}
	336	} else {
	337	switch (c.i.rs) {
	338	case OP_CP0_MFC0:
	339	case OP_CP0_CFC0:
	340	case OP_CP0_MTC0:
	341	case OP_CP0_CTC0:
	342	return snprintf(buf, len, "%s%s,%u",
	343	cp0_opcodes[c.i.rs],
	344	lightrec_reg_name(c.i.rt),
	345	c.r.rd);
	346	case OP_CP0_RFE:
	347	return snprintf(buf, len, "rfe ");
	348	default:
	349	return snprintf(buf, len, "unknown (0x%08x)", c.opcode);
	350	}
	351	}
	352	}
	353
	354	static int print_op(union code c, u32 pc, char *buf, size_t len,
ba3814c1	355	const char * const *flags_ptr, size_t nb_flags,
22eee2ac	356	bool *is_io)
98fa08a5 PC	357	{
	358	if (c.opcode == 0)
	359	return snprintf(buf, len, "nop ");
	360
	361	switch (c.i.op) {
	362	case OP_SPECIAL:
	363	return print_op_special(c, buf, len, flags_ptr, nb_flags);
	364	case OP_REGIMM:
	365	*flags_ptr = opcode_branch_flags;
	366	*nb_flags = ARRAY_SIZE(opcode_branch_flags);
	367	return snprintf(buf, len, "%s%s,0x%x",
	368	regimm_opcodes[c.i.rt],
	369	lightrec_reg_name(c.i.rs),
	370	pc + 4 + ((s16)c.i.imm << 2));
	371	case OP_J:
	372	case OP_JAL:
d8b04acd PC	373	*flags_ptr = opcode_branch_flags;
d8b04acd PC	374	*nb_flags = ARRAY_SIZE(opcode_branch_flags);
98fa08a5 PC	375	return snprintf(buf, len, "%s0x%x",
	376	std_opcodes[c.i.op],
	377	(pc & 0xf0000000) \| (c.j.imm << 2));
	378	case OP_BEQ:
03535202 PC	379	if (c.i.rs == c.i.rt) {
	380	*flags_ptr = opcode_branch_flags;
	381	*nb_flags = ARRAY_SIZE(opcode_branch_flags);
	382	return snprintf(buf, len, "b 0x%x",
	383	pc + 4 + ((s16)c.i.imm << 2));
	384	}
	385	fallthrough;
98fa08a5 PC	386	case OP_BNE:
	387	case OP_BLEZ:
	388	case OP_BGTZ:
	389	*flags_ptr = opcode_branch_flags;
	390	*nb_flags = ARRAY_SIZE(opcode_branch_flags);
	391	return snprintf(buf, len, "%s%s,%s,0x%x",
	392	std_opcodes[c.i.op],
	393	lightrec_reg_name(c.i.rs),
	394	lightrec_reg_name(c.i.rt),
	395	pc + 4 + ((s16)c.i.imm << 2));
	396	case OP_ADDI:
	397	case OP_ADDIU:
	398	case OP_SLTI:
	399	case OP_SLTIU:
	400	case OP_ANDI:
	401	case OP_ORI:
	402	case OP_XORI:
	403	return snprintf(buf, len, "%s%s,%s,0x%04hx",
	404	std_opcodes[c.i.op],
	405	lightrec_reg_name(c.i.rt),
	406	lightrec_reg_name(c.i.rs),
	407	(u16)c.i.imm);
	408
	409	case OP_LUI:
	410	return snprintf(buf, len, "%s%s,0x%04hx",
	411	std_opcodes[c.i.op],
	412	lightrec_reg_name(c.i.rt),
	413	(u16)c.i.imm);
	414	case OP_CP0:
	415	return print_op_cp(c, buf, len, 0);
	416	case OP_CP2:
	417	return print_op_cp(c, buf, len, 2);
	418	case OP_LB:
	419	case OP_LH:
	420	case OP_LWL:
	421	case OP_LW:
	422	case OP_LBU:
	423	case OP_LHU:
	424	case OP_LWR:
	425	case OP_SB:
	426	case OP_SH:
	427	case OP_SWL:
	428	case OP_SW:
	429	case OP_SWR:
	430	*flags_ptr = opcode_io_flags;
	431	*nb_flags = ARRAY_SIZE(opcode_io_flags);
22eee2ac	432	*is_io = true;
98fa08a5 PC	433	return snprintf(buf, len, "%s%s,%hd(%s)",
	434	std_opcodes[c.i.op],
	435	lightrec_reg_name(c.i.rt),
	436	(s16)c.i.imm,
	437	lightrec_reg_name(c.i.rs));
	438	case OP_LWC2:
	439	case OP_SWC2:
	440	*flags_ptr = opcode_io_flags;
	441	*nb_flags = ARRAY_SIZE(opcode_io_flags);
	442	return snprintf(buf, len, "%s%s,%hd(%s)",
	443	std_opcodes[c.i.op],
	444	lightrec_reg_name(c.i.rt),
	445	(s16)c.i.imm,
	446	lightrec_reg_name(c.i.rs));
	447	case OP_META_MOV:
	448	return snprintf(buf, len, "move %s,%s",
	449	lightrec_reg_name(c.r.rd),
	450	lightrec_reg_name(c.r.rs));
	451	case OP_META_EXTC:
	452	return snprintf(buf, len, "extc %s,%s",
	453	lightrec_reg_name(c.i.rt),
	454	lightrec_reg_name(c.i.rs));
	455	case OP_META_EXTS:
	456	return snprintf(buf, len, "exts %s,%s",
	457	lightrec_reg_name(c.i.rt),
	458	lightrec_reg_name(c.i.rs));
ba3814c1 PC	459	case OP_META_MULT2:
	460	case OP_META_MULTU2:
	461	*flags_ptr = opcode_multdiv_flags;
	462	*nb_flags = ARRAY_SIZE(opcode_multdiv_flags);
	463	return snprintf(buf, len, "%s%s,%s,%s,%u",
	464	mult2_opcodes[c.i.op == OP_META_MULTU2],
	465	lightrec_reg_name(get_mult_div_hi(c)),
	466	lightrec_reg_name(get_mult_div_lo(c)),
	467	lightrec_reg_name(c.r.rs), c.r.op);
98fa08a5 PC	468	default:
	469	return snprintf(buf, len, "unknown (0x%08x)", c.opcode);
	470	}
	471	}
	472
02487de7	473	void lightrec_print_disassembly(const struct block block, const u32 code_ptr)
98fa08a5 PC	474	{
98fa08a5 PC	475	const struct opcode *op;
ba3814c1	476	const char * const *flags_ptr;
98fa08a5 PC	477	size_t nb_flags, count, count2;
98fa08a5 PC	478	char buf[256], buf2[256], buf3[256];
d16005f8	479	unsigned int i;
02487de7	480	u32 pc, branch_pc, code;
22eee2ac	481	bool is_io;
98fa08a5 PC	482
	483	for (i = 0; i < block->nb_ops; i++) {
	484	op = &block->opcode_list[i];
	485	branch_pc = get_branch_pc(block, i, 0);
	486	pc = block->pc + (i << 2);
02487de7	487	code = LE32TOH(code_ptr[i]);
98fa08a5	488
02487de7	489	count = print_op((union code)code, pc, buf, sizeof(buf),
22eee2ac	490	&flags_ptr, &nb_flags, &is_io);
98fa08a5 PC	491
	492	flags_ptr = NULL;
	493	nb_flags = 0;
22eee2ac	494	is_io = false;
98fa08a5	495	count2 = print_op(op->c, branch_pc, buf2, sizeof(buf2),
22eee2ac	496	&flags_ptr, &nb_flags, &is_io);
98fa08a5	497
02487de7	498	if (code == op->c.opcode) {
98fa08a5 PC	499	*buf2 = '\0';
	500	count2 = 0;
	501	}
	502
03535202	503	print_flags(buf3, sizeof(buf3), op, flags_ptr, nb_flags, is_io);
d16005f8	504
98fa08a5 PC	505	printf("0x%08x (0x%x)\t%s%c%s%c%s\n", pc, i << 2,
98fa08a5 PC	506	buf, 30 - (int)count, ' ', buf2, 30 - (int)count2, ' ', buf3);
d16005f8 PC	507	}
d16005f8 PC	508	}