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/* SPDX-License-Identifier: BSD-2-Clause */
/* Copyright 1996-2025 The NASM Authors - All Rights Reserved */
/*
* common.c - code common to nasm and ndisasm
*/
#include "compiler.h"
#include "nasm.h"
#include "nasmlib.h"
#include "insns.h"
/*
* Per-pass global (across segments) state
*/
struct globalopt globl;
/*
* Name of a register token, if applicable; otherwise NULL
*/
const char *register_name(int token)
{
if (is_register(token))
return nasm_reg_names[token - EXPR_REG_START];
else
return NULL;
}
/*
* Common list of prefix names; ideally should be auto-generated
* from tokens.dat. This MUST match the enum in include/nasm.h.
*/
const char *prefix_name(int token)
{
static const char * const
prefix_names[PREFIX_ENUM_LIMIT - PREFIX_ENUM_START] = {
"a16", "a32", "a64", "asp", "lock", "o16", "o32", "o64", "osp",
"rep", "repe", "repne", "repnz", "repz", "wait",
"xacquire", "xrelease", "bnd", "nobnd", "{rex}", "{rex2}",
"{evex}", "{vex}", "{vex3}", "{vex2}", "{nf}", "{zu}",
"{pt}", "{pn}"
};
const char *name;
/* A register can also be a prefix */
name = register_name(token);
if (!name) {
const unsigned int prefix = token - PREFIX_ENUM_START;
if (prefix < ARRAY_SIZE(prefix_names))
name = prefix_names[prefix];
}
return name;
}
/*
* True for a valid hinting-NOP opcode, after 0F.
*/
bool is_hint_nop(uint64_t op)
{
if (op >> 16)
return false;
if ((op >> 8) == 0x0f)
op = (uint8_t)op;
else if (op >> 8)
return false;
return ((op & ~7) == 0x18) || (op == 0x0d);
}
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