| 1 | /* $Id: tstLdrDisasmTest.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTLdr test object.
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| 4 | *
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| 5 | * We use precompiled versions of this object for testing all the loaders.
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| 6 | *
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| 7 | * This is not supposed to be pretty or usable code, just something which
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| 8 | * make life difficult for the loader.
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| 9 | */
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| 10 |
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| 11 | /*
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| 12 | * Copyright (C) 2006-2017 Oracle Corporation
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| 13 | *
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| 14 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 15 | * available from http://www.virtualbox.org. This file is free software;
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| 16 | * you can redistribute it and/or modify it under the terms of the GNU
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| 17 | * General Public License (GPL) as published by the Free Software
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| 18 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 19 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 20 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 21 | *
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| 22 | * The contents of this file may alternatively be used under the terms
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| 23 | * of the Common Development and Distribution License Version 1.0
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| 24 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 25 | * VirtualBox OSE distribution, in which case the provisions of the
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| 26 | * CDDL are applicable instead of those of the GPL.
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| 27 | *
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| 28 | * You may elect to license modified versions of this file under the
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| 29 | * terms and conditions of either the GPL or the CDDL or both.
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| 30 | */
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| 31 |
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| 32 |
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| 33 |
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| 34 | /*********************************************************************************************************************************
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| 35 | * Header Files *
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| 36 | *********************************************************************************************************************************/
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| 37 | #include <VBox/dis.h>
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| 38 | #include <VBox/disopcode.h>
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| 39 | #include <iprt/string.h>
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| 40 |
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| 41 | #if defined(IN_RING0) && !defined(RT_OS_WINDOWS) /* Too lazy to make import libs. */
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| 42 | extern "C" DECLIMPORT(int) MyPrintf(const char *pszFormat, ...);
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| 43 | # define MY_PRINTF(a) MyPrintf a
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| 44 | #else
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| 45 | # define MY_PRINTF(a) do {} while (0)
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| 46 | #endif
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| 47 |
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| 48 |
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| 49 | /*********************************************************************************************************************************
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| 50 | * Global Variables *
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| 51 | *********************************************************************************************************************************/
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| 52 |
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| 53 | /* 32-bit code */
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| 54 | static const uint8_t g_ab32BitCode[] =
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| 55 | {
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| 56 | 0x55, // 1000ab50 55 push ebp
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| 57 | 0x8b,0xec, // 1000ab51 8bec mov ebp,esp
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| 58 | 0x8b,0x45,0x08, // 1000ab53 8b4508 mov eax,dword ptr [ebp+8]
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| 59 | 0x81,0x38,0x07,0x07,// 1000ab56 813807076419 cmp dword ptr [eax],19640707h
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| 60 | 0x64,0x19,
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| 61 | 0x75,0x09, // 1000ab5c 7509 jne kLdr!kLdrModMap+0x17 (1000ab67)
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| 62 | 0x8b,0x4d,0x08, // 1000ab5e 8b4d08 mov ecx,dword ptr [ebp+8]
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| 63 | 0x83,0x79,0x2c,0x00,// 1000ab61 83792c00 cmp dword ptr [ecx+2Ch],0
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| 64 | 0x75,0x07, // 1000ab65 7507 jne kLdr!kLdrModMap+0x1e (1000ab6e)
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| 65 | 0xb8,0xc0,0x68,0x06,// 1000ab67 b8c0680600 mov eax,668C0h
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| 66 | 0x00,
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| 67 | 0xeb,0x14, // 1000ab6c eb14 jmp kLdr!kLdrModMap+0x32 (1000ab82)
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| 68 | 0x33,0xd2, // 1000ab6e 33d2 xor edx,edx
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| 69 | 0x75,0xe1, // 1000ab70 75e1 jne kLdr!kLdrModMap+0x3 (1000ab53)
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| 70 | 0x8b,0x45,0x08, // 1000ab72 8b4508 mov eax,dword ptr [ebp+8]
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| 71 | 0x50, // 1000ab75 50 push eax
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| 72 | 0x8b,0x4d,0x08, // 1000ab76 8b4d08 mov ecx,dword ptr [ebp+8]
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| 73 | 0x8b,0x51,0x2c, // 1000ab79 8b512c mov edx,dword ptr [ecx+2Ch]
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| 74 | 0xff,0x52,0x3c, // 1000ab7c ff523c call dword ptr [edx+3Ch]
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| 75 | 0x83,0xc4,0x04, // 1000ab7f 83c404 add esp,4
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| 76 | 0x5d, // 1000ab82 5d pop ebp
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| 77 | 0xc3, // 1000ab83 c3 ret
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| 78 | 0xcc
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| 79 | };
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| 80 |
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| 81 |
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| 82 | /**
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| 83 | * @callback_method_impl{FNDISREADBYTES}
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| 84 | */
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| 85 | static DECLCALLBACK(int) DisasmTest1ReadCode(PDISCPUSTATE pDis, uint8_t offInstr, uint8_t cbMinRead, uint8_t cbMaxRead)
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| 86 | {
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| 87 | size_t cb = cbMaxRead;
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| 88 | if (cb + pDis->uInstrAddr + offInstr > sizeof(g_ab32BitCode))
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| 89 | cb = cbMinRead;
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| 90 | memcpy(&pDis->abInstr[offInstr], &g_ab32BitCode[pDis->uInstrAddr + offInstr], cb);
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| 91 | pDis->cbCachedInstr = offInstr + (uint8_t)cb;
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| 92 | return VINF_SUCCESS;
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| 93 | }
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| 94 |
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| 95 |
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| 96 | /*
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| 97 | * Use an inline function here just to test '__textcoal_nt' sections on darwin.
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| 98 | */
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| 99 | inline int MyDisasm(uintptr_t CodeIndex, PDISCPUSTATE pCpu, uint32_t *pcb)
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| 100 | {
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| 101 | uint32_t cb;
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| 102 | int rc = DISInstrWithReader(CodeIndex, DISCPUMODE_32BIT, DisasmTest1ReadCode, 0, pCpu, &cb);
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| 103 | *pcb = cb;
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| 104 | MY_PRINTF(("DISCoreOneEx -> rc=%d cb=%d Cpu: bOpCode=%#x pCurInstr=%p (42=%d)\n", \
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| 105 | rc, cb, pCpu->bOpCode, pCpu->pCurInstr, 42)); \
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| 106 | return rc;
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| 107 | }
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| 108 |
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| 109 |
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| 110 | extern "C" DECLEXPORT(int) DisasmTest1(void)
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| 111 | {
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| 112 | DISCPUSTATE Cpu;
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| 113 | uintptr_t CodeIndex = 0;
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| 114 | uint32_t cb;
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| 115 | int rc;
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| 116 | MY_PRINTF(("DisasmTest1: %p\n", &DisasmTest1));
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| 117 |
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| 118 | memset(&Cpu, 0, sizeof(Cpu));
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| 119 |
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| 120 | #define DISAS_AND_CHECK(cbInstr, enmOp) \
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| 121 | do { \
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| 122 | rc = MyDisasm(CodeIndex, &Cpu, &cb); \
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| 123 | if (RT_FAILURE(rc)) \
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| 124 | return CodeIndex | 0xf000; \
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| 125 | if (Cpu.pCurInstr->uOpcode != (enmOp)) \
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| 126 | return CodeIndex| 0xe000; \
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| 127 | if (cb != (cbInstr)) \
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| 128 | return CodeIndex | 0xd000; \
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| 129 | CodeIndex += cb; \
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| 130 | } while (0)
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| 131 |
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| 132 | DISAS_AND_CHECK(1, OP_PUSH);
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| 133 | DISAS_AND_CHECK(2, OP_MOV);
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| 134 | DISAS_AND_CHECK(3, OP_MOV);
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| 135 | DISAS_AND_CHECK(6, OP_CMP);
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| 136 | DISAS_AND_CHECK(2, OP_JNE);
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| 137 | DISAS_AND_CHECK(3, OP_MOV);
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| 138 | DISAS_AND_CHECK(4, OP_CMP);
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| 139 | DISAS_AND_CHECK(2, OP_JNE);
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| 140 | DISAS_AND_CHECK(5, OP_MOV);
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| 141 | DISAS_AND_CHECK(2, OP_JMP);
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| 142 | DISAS_AND_CHECK(2, OP_XOR);
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| 143 | DISAS_AND_CHECK(2, OP_JNE);
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| 144 | DISAS_AND_CHECK(3, OP_MOV);
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| 145 | DISAS_AND_CHECK(1, OP_PUSH);
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| 146 | DISAS_AND_CHECK(3, OP_MOV);
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| 147 | DISAS_AND_CHECK(3, OP_MOV);
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| 148 | DISAS_AND_CHECK(3, OP_CALL);
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| 149 | DISAS_AND_CHECK(3, OP_ADD);
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| 150 | DISAS_AND_CHECK(1, OP_POP);
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| 151 | DISAS_AND_CHECK(1, OP_RETN);
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| 152 | DISAS_AND_CHECK(1, OP_INT3);
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| 153 |
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| 154 | return rc;
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| 155 | }
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| 156 |
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