| 1 | /* $Id: DisasmFormatBytes.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBox Disassembler - Helper for formatting the opcode bytes.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2008 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*******************************************************************************
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| 20 | * Header Files *
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| 21 | *******************************************************************************/
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| 22 | #include "DisasmInternal.h"
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| 23 | #include <iprt/string.h>
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| 24 | #include <iprt/assert.h>
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| 25 | #include <iprt/err.h>
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| 26 |
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| 27 |
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| 28 | /**
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| 29 | * Helper function for formatting the opcode bytes.
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| 30 | *
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| 31 | * @returns The number of output bytes.
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| 32 | *
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| 33 | * @param pCpu Pointer to the disassembler cpu state.
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| 34 | * @param pszDst The output buffer.
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| 35 | * @param cchDst The size of the output buffer.
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| 36 | * @param fFlags The flags passed to the formatter.
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| 37 | */
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| 38 | size_t disFormatBytes(PCDISCPUSTATE pCpu, char *pszDst, size_t cchDst, uint32_t fFlags)
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| 39 | {
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| 40 | /*
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| 41 | * Read the bytes first.
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| 42 | */
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| 43 | uint8_t ab[16];
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| 44 | uint32_t cb = pCpu->opsize;
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| 45 | Assert(cb <= 16);
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| 46 | if (cb > 16)
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| 47 | cb = 16;
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| 48 |
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| 49 | if (pCpu->pfnReadBytes)
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| 50 | {
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| 51 | int rc = pCpu->pfnReadBytes(pCpu->opaddr, &ab[0], cb, (void *)pCpu);
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| 52 | if (RT_FAILURE(rc))
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| 53 | {
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| 54 | for (uint32_t i = 0; i < cb; i++)
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| 55 | {
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| 56 | int rc2 = pCpu->pfnReadBytes(pCpu->opaddr + i, &ab[i], 1, (void *)pCpu);
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| 57 | if (RT_FAILURE(rc2))
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| 58 | ab[i] = 0xcc;
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| 59 | }
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| 60 | }
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| 61 | }
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| 62 | else
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| 63 | {
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| 64 | uint8_t const *pabSrc = (uint8_t const *)(uintptr_t)pCpu->opaddr;
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| 65 | for (uint32_t i = 0; i < cb; i++)
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| 66 | ab[i] = pabSrc[i];
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| 67 | }
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| 68 |
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| 69 | /*
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| 70 | * Now for the output.
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| 71 | */
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| 72 | size_t cchOutput = 0;
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| 73 | #define PUT_C(ch) \
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| 74 | do { \
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| 75 | cchOutput++; \
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| 76 | if (cchDst > 1) \
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| 77 | { \
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| 78 | cchDst--; \
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| 79 | *pszDst++ = (ch); \
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| 80 | } \
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| 81 | } while (0)
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| 82 | #define PUT_NUM(cch, fmt, num) \
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| 83 | do { \
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| 84 | cchOutput += (cch); \
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| 85 | if (cchDst > 1) \
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| 86 | { \
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| 87 | const size_t cchTmp = RTStrPrintf(pszDst, cchDst, fmt, (num)); \
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| 88 | pszDst += cchTmp; \
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| 89 | cchDst -= cchTmp; \
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| 90 | } \
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| 91 | } while (0)
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| 92 |
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| 93 |
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| 94 | if (fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS)
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| 95 | PUT_C('[');
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| 96 |
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| 97 | for (uint32_t i = 0; i < cb; i++)
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| 98 | {
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| 99 | if (i != 0 && (fFlags & DIS_FMT_FLAGS_BYTES_SPACED))
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| 100 | PUT_NUM(3, " %02x", ab[i]);
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| 101 | else
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| 102 | PUT_NUM(2, "%02x", ab[i]);
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| 103 | }
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| 104 |
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| 105 | if (fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS)
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| 106 | PUT_C(']');
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| 107 |
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| 108 | /* Terminate it just in case. */
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| 109 | if (cchDst >= 1)
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| 110 | *pszDst = '\0';
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| 111 |
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| 112 | #undef PUT_C
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| 113 | #undef PUT_NUM
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| 114 | return cchOutput;
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| 115 | }
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| 116 |
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