| 1 | /* $Id: ldrELF.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - 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 Sun Microsystems, Inc.
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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 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | *
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| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #define LOG_GROUP RTLOGGROUP_LDR
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| 36 | #include <iprt/ldr.h>
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| 37 | #include <iprt/alloc.h>
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| 38 | #include <iprt/assert.h>
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| 39 | #include <iprt/string.h>
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| 40 | #include <iprt/log.h>
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| 41 | #include <iprt/err.h>
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| 42 | #include "internal/ldrELF32.h"
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| 43 | #include "internal/ldrELF64.h"
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| 44 | #include "internal/ldrELFi386.h"
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| 45 | #include "internal/ldrELFAmd64.h"
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| 46 | #include "internal/ldr.h"
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| 47 |
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| 48 |
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| 49 |
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| 50 | /*******************************************************************************
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| 51 | * Defined Constants And Macros *
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| 52 | *******************************************************************************/
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| 53 | /** Finds an ELF string. */
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| 54 | #define ELF_STR(pHdrs, iStr) ((pHdrs)->pStr + (iStr))
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| 55 |
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| 56 |
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| 57 |
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| 58 | /*******************************************************************************
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| 59 | * Internal Functions *
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| 60 | *******************************************************************************/
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| 61 | #ifdef LOG_ENABLED
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| 62 | static const char *rtldrElfGetShdrType(uint32_t iType);
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| 63 | #endif
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| 64 |
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| 65 |
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| 66 | /* Select ELF mode and include the template. */
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| 67 | #define ELF_MODE 32
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| 68 | #define Elf_Reloc Elf_Rel
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| 69 | #include "ldrELFRelocatable.cpp.h"
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| 70 | #undef ELF_MODE
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| 71 | #undef Elf_Reloc
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| 72 |
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| 73 |
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| 74 | #define ELF_MODE 64
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| 75 | #define Elf_Reloc Elf_Rela
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| 76 | #include "ldrELFRelocatable.cpp.h"
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| 77 | #undef ELF_MODE
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| 78 | #undef Elf_Reloc
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| 79 |
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| 80 |
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| 81 | #ifdef LOG_ENABLED
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| 82 | /**
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| 83 | * Gets the section type.
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| 84 | *
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| 85 | * @returns Pointer to read only string.
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| 86 | * @param iType The section type index.
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| 87 | */
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| 88 | static const char *rtldrElfGetShdrType(uint32_t iType)
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| 89 | {
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| 90 | switch (iType)
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| 91 | {
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| 92 | case SHT_NULL: return "SHT_NULL";
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| 93 | case SHT_PROGBITS: return "SHT_PROGBITS";
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| 94 | case SHT_SYMTAB: return "SHT_SYMTAB";
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| 95 | case SHT_STRTAB: return "SHT_STRTAB";
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| 96 | case SHT_RELA: return "SHT_RELA";
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| 97 | case SHT_HASH: return "SHT_HASH";
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| 98 | case SHT_DYNAMIC: return "SHT_DYNAMIC";
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| 99 | case SHT_NOTE: return "SHT_NOTE";
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| 100 | case SHT_NOBITS: return "SHT_NOBITS";
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| 101 | case SHT_REL: return "SHT_REL";
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| 102 | case SHT_SHLIB: return "SHT_SHLIB";
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| 103 | case SHT_DYNSYM: return "SHT_DYNSYM";
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| 104 | default:
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| 105 | return "";
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| 106 | }
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| 107 | }
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| 108 | #endif
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| 109 |
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| 110 |
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| 111 | /**
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| 112 | * Open an ELF image.
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| 113 | *
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| 114 | * @returns iprt status code.
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| 115 | * @param pReader The loader reader instance which will provide the raw image bits.
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| 116 | * @param phLdrMod Where to store the handle.
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| 117 | */
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| 118 | int rtldrELFOpen(PRTLDRREADER pReader, PRTLDRMOD phLdrMod)
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| 119 | {
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| 120 | const char *pszLogName = pReader->pfnLogName(pReader); NOREF(pszLogName);
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| 121 |
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| 122 | /*
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| 123 | * Read the ident to decide if this is 32-bit or 64-bit
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| 124 | * and worth dealing with.
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| 125 | */
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| 126 | uint8_t e_ident[EI_NIDENT];
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| 127 | int rc = pReader->pfnRead(pReader, &e_ident, sizeof(e_ident), 0);
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| 128 | if (RT_FAILURE(rc))
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| 129 | return rc;
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| 130 | if ( e_ident[EI_MAG0] != ELFMAG0
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| 131 | || e_ident[EI_MAG1] != ELFMAG1
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| 132 | || e_ident[EI_MAG2] != ELFMAG2
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| 133 | || e_ident[EI_MAG3] != ELFMAG3
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| 134 | || ( e_ident[EI_CLASS] != ELFCLASS32
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| 135 | && e_ident[EI_CLASS] != ELFCLASS64)
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| 136 | )
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| 137 | {
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| 138 | Log(("RTLdrELF: %s: Unsupported/invalid ident %.*Rhxs\n", pszLogName, sizeof(e_ident), e_ident));
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| 139 | return VERR_BAD_EXE_FORMAT;
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| 140 | }
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| 141 | if (e_ident[EI_DATA] != ELFDATA2LSB)
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| 142 | {
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| 143 | Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", e_ident[EI_DATA]));
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| 144 | return VERR_LDRELF_ODD_ENDIAN;
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| 145 | }
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| 146 | if (e_ident[EI_CLASS] == ELFCLASS32)
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| 147 | rc = rtldrELF32Open(pReader, phLdrMod);
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| 148 | else
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| 149 | rc = rtldrELF64Open(pReader, phLdrMod);
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| 150 | return rc;
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| 151 | }
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| 152 |
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