| 1 | /* $Id: ldrELF.cpp 4071 2007-08-07 17:07:59Z vboxsync $ */
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| 2 | /** @file
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| 3 | * innotek Portable Runtime - Binary Image Loader, Executable and Linker Format (ELF).
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 innotek GmbH
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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 as published by the Free Software Foundation,
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| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | * 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 | #define LOG_GROUP RTLOGGROUP_LDR
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| 23 | #include <iprt/ldr.h>
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| 24 | #include <iprt/alloc.h>
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| 25 | #include <iprt/assert.h>
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| 26 | #include <iprt/string.h>
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| 27 | #include <iprt/log.h>
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| 28 | #include <iprt/err.h>
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| 29 | #include "internal/ldrELF32.h"
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| 30 | #include "internal/ldrELF64.h"
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| 31 | #include "internal/ldrELFi386.h"
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| 32 | #include "internal/ldrELFAmd64.h"
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| 33 | #include "internal/ldr.h"
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| 34 |
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| 35 |
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| 36 |
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| 37 | /*******************************************************************************
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| 38 | * Defined Constants And Macros *
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| 39 | *******************************************************************************/
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| 40 | /** Finds an ELF string. */
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| 41 | #define ELF_STR(pHdrs, iStr) ((pHdrs)->pStr + (iStr))
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| 42 |
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| 43 |
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| 44 |
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| 45 | /*******************************************************************************
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| 46 | * Internal Functions *
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| 47 | *******************************************************************************/
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| 48 | #ifdef LOG_ENABLED
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| 49 | static const char *rtldrElfGetShdrType(uint32_t iType);
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| 50 | #endif
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| 51 |
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| 52 |
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| 53 | /* Select ELF mode and include the template. */
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| 54 | #define ELF_MODE 32
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| 55 | #define Elf_Reloc Elf_Rel
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| 56 | #include "ldrELFRelocatable.cpp.h"
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| 57 | #undef ELF_MODE
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| 58 | #undef Elf_Reloc
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| 59 |
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| 60 |
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| 61 | #define ELF_MODE 64
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| 62 | #define Elf_Reloc Elf_Rela
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| 63 | #include "ldrELFRelocatable.cpp.h"
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| 64 | #undef ELF_MODE
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| 65 | #undef Elf_Reloc
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| 66 |
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| 67 |
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| 68 | #ifdef LOG_ENABLED
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| 69 | /**
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| 70 | * Gets the section type.
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| 71 | *
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| 72 | * @returns Pointer to read only string.
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| 73 | * @param iType The section type index.
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| 74 | */
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| 75 | static const char *rtldrElfGetShdrType(uint32_t iType)
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| 76 | {
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| 77 | switch (iType)
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| 78 | {
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| 79 | case SHT_NULL: return "SHT_NULL";
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| 80 | case SHT_PROGBITS: return "SHT_PROGBITS";
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| 81 | case SHT_SYMTAB: return "SHT_SYMTAB";
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| 82 | case SHT_STRTAB: return "SHT_STRTAB";
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| 83 | case SHT_RELA: return "SHT_RELA";
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| 84 | case SHT_HASH: return "SHT_HASH";
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| 85 | case SHT_DYNAMIC: return "SHT_DYNAMIC";
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| 86 | case SHT_NOTE: return "SHT_NOTE";
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| 87 | case SHT_NOBITS: return "SHT_NOBITS";
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| 88 | case SHT_REL: return "SHT_REL";
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| 89 | case SHT_SHLIB: return "SHT_SHLIB";
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| 90 | case SHT_DYNSYM: return "SHT_DYNSYM";
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| 91 | default:
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| 92 | return "";
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| 93 | }
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| 94 | }
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| 95 | #endif
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| 96 |
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| 97 |
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| 98 | /**
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| 99 | * Open an ELF image.
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| 100 | *
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| 101 | * @returns iprt status code.
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| 102 | * @param pReader The loader reader instance which will provide the raw image bits.
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| 103 | * @param phLdrMod Where to store the handle.
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| 104 | */
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| 105 | int rtldrELFOpen(PRTLDRREADER pReader, PRTLDRMOD phLdrMod)
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| 106 | {
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| 107 | const char *pszLogName = pReader->pfnLogName(pReader); NOREF(pszLogName);
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| 108 |
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| 109 | /*
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| 110 | * Read the ident to decide if this is 32-bit or 64-bit
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| 111 | * and worth dealing with.
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| 112 | */
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| 113 | uint8_t e_ident[EI_NIDENT];
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| 114 | int rc = pReader->pfnRead(pReader, &e_ident, sizeof(e_ident), 0);
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| 115 | if (RT_FAILURE(rc))
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| 116 | return rc;
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| 117 | if ( e_ident[EI_MAG0] != ELFMAG0
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| 118 | || e_ident[EI_MAG1] != ELFMAG1
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| 119 | || e_ident[EI_MAG2] != ELFMAG2
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| 120 | || e_ident[EI_MAG3] != ELFMAG3
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| 121 | || ( e_ident[EI_CLASS] != ELFCLASS32
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| 122 | && e_ident[EI_CLASS] != ELFCLASS64)
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| 123 | )
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| 124 | {
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| 125 | Log(("RTLdrELF: %s: Unsupported/invalid ident %.*Rhxs\n", pszLogName, sizeof(e_ident), e_ident));
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| 126 | return VERR_BAD_EXE_FORMAT;
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| 127 | }
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| 128 | if (e_ident[EI_DATA] != ELFDATA2LSB)
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| 129 | {
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| 130 | Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", e_ident[EI_DATA]));
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| 131 | return VERR_LDRELF_ODD_ENDIAN;
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| 132 | }
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| 133 | if (e_ident[EI_CLASS] == ELFCLASS32)
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| 134 | rc = rtldrELF32Open(pReader, phLdrMod);
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| 135 | else
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| 136 | rc = rtldrELF64Open(pReader, phLdrMod);
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| 137 | return rc;
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| 138 | }
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| 139 |
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