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/* SPDX-License-Identifier: BSD-2-Clause */
/* Copyright 1996-2025 The NASM Authors - All Rights Reserved */
/*
* disasm.h header file for disasm.c
*/
#ifndef NASM_DISASM_H
#define NASM_DISASM_H
#include "nasm.h"
#include "insnsi.h"
#include "iflag.h"
/*
* This buffer must be at least twice as long as the max instruction,
* which must include the WAIT pseudo-prefix, for a total of 15+1 = 16
* bytes.
*/
#define INSN_MAX 32
int32_t disasm(const uint8_t *dp, int32_t data_size,
char *output, int outbufsize,
int segsize, int64_t offset, int autosync,
iflag_t *prefer);
int32_t eatbyte(uint8_t byte, char *output, int outbufsize, int segsize);
/* The rex types that matter for the purpose of decoding */
enum rextype {
REX_NONE,
REX_REX,
REX_REX2,
REX_VEX, /* Includes XOP */
REX_EVEX
};
/*
* Prefix information
*/
struct rexfields {
uint32_t raw; /* Raw value */
uint32_t flags; /* REX_ flags from nasm.h */
enum rextype type;
uint8_t len; /* Length of REX prefix */
uint8_t breg; /* B register */
uint8_t bregbv; /* B register if B is a vector */
uint8_t xreg; /* X register */
uint8_t xregxv; /* X register if X is a vector */
uint8_t vreg; /* V register */
uint8_t vregxv; /* V register if X is a vector */
uint8_t rreg;
uint8_t opc; /* Masked opcode */
uint8_t map;
uint8_t xmap; /* Extended map (base from insnsi.h added) */
uint8_t pp;
uint8_t w;
uint8_t l;
uint8_t z;
uint8_t b;
uint8_t nd;
uint8_t zu;
uint8_t aaa;
uint8_t nf;
uint8_t dfl;
uint8_t scc;
};
struct prefix_info {
uint8_t osize; /* Operand size */
uint8_t asize; /* Address size */
uint8_t osp; /* Operand size prefix present */
uint8_t asp; /* Address size prefix present */
uint8_t rep; /* Rep prefix present */
uint8_t seg; /* Segment override prefix present */
uint8_t wait; /* WAIT "prefix" present */
uint8_t lock; /* Lock prefix present */
enum reg_enum segover; /* Segment override register enum */
struct rexfields rex; /* REX/REX2/VEX/EVEX */
};
const uint8_t *parse_prefixes(struct prefix_info *pf, const uint8_t *data,
int bits);
#define fetch_safe(_start, _ptr, _size, _need, _op) \
do { \
if (((_ptr) - (_start)) >= ((_size) - (_need))) \
_op; \
} while (0)
#endif
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