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/* $Id: DisasmFormatBytes.cpp $ */
/** @file
* VBox Disassembler - Helper for formatting the opcode bytes.
*/
/*
* Copyright (C) 2008 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "DisasmInternal.h"
#include <iprt/string.h>
#include <iprt/assert.h>
#include <iprt/err.h>
/**
* Helper function for formatting the opcode bytes.
*
* @returns The number of output bytes.
*
* @param pCpu Pointer to the disassembler cpu state.
* @param pszDst The output buffer.
* @param cchDst The size of the output buffer.
* @param fFlags The flags passed to the formatter.
*/
size_t disFormatBytes(PCDISCPUSTATE pCpu, char *pszDst, size_t cchDst, uint32_t fFlags)
{
/*
* Read the bytes first.
*/
uint8_t ab[16];
uint32_t cb = pCpu->opsize;
Assert(cb <= 16);
if (cb > 16)
cb = 16;
if (pCpu->pfnReadBytes)
{
int rc = pCpu->pfnReadBytes(pCpu->opaddr, &ab[0], cb, (void *)pCpu);
if (RT_FAILURE(rc))
{
for (uint32_t i = 0; i < cb; i++)
{
int rc2 = pCpu->pfnReadBytes(pCpu->opaddr + i, &ab[i], 1, (void *)pCpu);
if (RT_FAILURE(rc2))
ab[i] = 0xcc;
}
}
}
else
{
uint8_t const *pabSrc = (uint8_t const *)(uintptr_t)pCpu->opaddr;
for (uint32_t i = 0; i < cb; i++)
ab[i] = pabSrc[i];
}
/*
* Now for the output.
*/
size_t cchOutput = 0;
#define PUT_C(ch) \
do { \
cchOutput++; \
if (cchDst > 1) \
{ \
cchDst--; \
*pszDst++ = (ch); \
} \
} while (0)
#define PUT_NUM(cch, fmt, num) \
do { \
cchOutput += (cch); \
if (cchDst > 1) \
{ \
const size_t cchTmp = RTStrPrintf(pszDst, cchDst, fmt, (num)); \
pszDst += cchTmp; \
cchDst -= cchTmp; \
} \
} while (0)
if (fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS)
PUT_C('[');
for (uint32_t i = 0; i < cb; i++)
{
if (i != 0 && (fFlags & DIS_FMT_FLAGS_BYTES_SPACED))
PUT_NUM(3, " %02x", ab[i]);
else
PUT_NUM(2, "%02x", ab[i]);
}
if (fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS)
PUT_C(']');
/* Terminate it just in case. */
if (cchDst >= 1)
*pszDst = '\0';
#undef PUT_C
#undef PUT_NUM
return cchOutput;
}
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