| 1 | /* $Id: elf2lx.cpp,v 1.6 2001-02-10 11:11:42 bird Exp $
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| 2 | *
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| 3 | * Elf2Lx - implementation.
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| 4 | *
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| 5 | * Copyright (c) 1999-2000 knut st. osmundsen (knut.stange.osmundsen@mynd.no)
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| 6 | *
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| 7 | * Project Odin Software License can be found in LICENSE.TXT
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| 8 | *
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| 9 | */
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| 10 |
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| 11 |
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| 12 | /*******************************************************************************
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| 13 | * Defined Constants And Macros *
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| 14 | *******************************************************************************/
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| 15 | #define FOR_EXEHDR 1 /* To make all object flags OBJ???. */
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| 16 | #define INCL_DOSERRORS /* DOS Error codes. */
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| 17 | #ifdef RING0
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| 18 | #define INCL_OS2KRNL_LDR /* LdrRead */
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| 19 | #define INCL_NOAPI /* RING0: No apis. */
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| 20 | #else /*RING3*/
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| 21 | #define INCL_DOSPROCESS /* RING3: DosSleep. */
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| 22 | #endif
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| 23 |
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| 24 | /*******************************************************************************
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| 25 | * Header Files *
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| 26 | *******************************************************************************/
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| 27 | #include <os2.h> /* OS/2 header file. */
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| 28 | #include "types.h" /* Types used by the next two files. */
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| 29 | #include <newexe.h> /* OS/2 NE structs and definitions. */
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| 30 | #include <exe386.h> /* OS/2 LX structs and definitions. */
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| 31 |
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| 32 | #include "devSegDf.h" /* Win32k segment definitions. */
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| 33 |
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| 34 | #include "malloc.h" /* win32k malloc (resident). Not C library! */
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| 35 | #include "smalloc.h" /* win32k swappable heap. */
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| 36 | #include "rmalloc.h" /* win32k resident heap. */
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| 37 |
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| 38 | #include <string.h> /* C library string.h. */
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| 39 | #include <stdlib.h> /* C library stdlib.h. */
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| 40 | #include <stddef.h> /* C library stddef.h. */
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| 41 | #include <stdarg.h> /* C library stdarg.h. */
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| 42 |
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| 43 | #include "vprintf.h" /* win32k printf and vprintf. Not C library! */
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| 44 | #include "dev32.h" /* 32-Bit part of the device driver. (SSToDS) */
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| 45 | #include "OS2Krnl.h" /* kernel structs. (SFN) */
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| 46 |
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| 47 | #include "elf.h" /* Elf binary format definitions. */
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| 48 | #include "modulebase.h" /* ModuleBase class definitions, ++. */
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| 49 | #include "elf2lx.h" /* Elf2Lx class definitions. */
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| 50 |
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| 51 |
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| 52 |
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| 53 | /**
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| 54 | * Initiation and termination code for libraries.
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| 55 | *
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| 56 | * How will OS2NIX initiate libraries?
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| 57 | * -A library will register with the OS2NIX dll on init and deregister on
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| 58 | * termintation.
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| 59 | * -If this is before the executable has registered its self, the library
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| 60 | * will not be initiated yet. The initiation will take place when the
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| 61 | * executable register.
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| 62 | * -If it is a dynamically loaded library, we'll initiate it during registation.
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| 63 | * Or we could initiate it when the load library call returns, ie. after
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| 64 | * DosLoadModule. It depends on how we may resolv addresses of external symbols.
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| 65 | *
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| 66 | */
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| 67 | static UCHAR achInitTermCode[] =
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| 68 | {
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| 69 | 0xCC
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| 70 | };
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| 71 |
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| 72 |
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| 73 | /**
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| 74 | * Startup code for executables.
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| 75 | *
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| 76 | * How will OS2NIX start an Elf executable?
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| 77 | * -An executable will register with the OS2NIX dll on startup.
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| 78 | * -During this registration it'll resolv addresses of external symbols for
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| 79 | * the executable and all the libraries registered at this time. It will then
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| 80 | * call the initiation routines for the libraries. Finally it will start
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| 81 | * the executable.
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| 82 | * -If this was a forked process then other steps has to be taken during registration?
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| 83 | *
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| 84 | */
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| 85 | static UCHAR achStartupCode[] =
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| 86 | {
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| 87 | 0xCC
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| 88 | };
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| 89 |
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| 90 |
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| 91 |
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| 92 | /**
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| 93 | * Constructor. Initiates all data members and sets hFile.
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| 94 | * @param hFile Filehandle.
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| 95 | * @status Partially implemented.
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| 96 | * @author knut st. osmundsen
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| 97 | * @remark Remember to update this everytime a new parameter is added.
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| 98 | */
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| 99 | Elf2Lx::Elf2Lx(SFN hFile) :
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| 100 | ModuleBase(hFile)
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| 101 | {
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| 102 | memset(&LXHdr, 0, sizeof(LXHdr));
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| 103 | LXHdr.e32_magic[0] = E32MAGIC1;
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| 104 | LXHdr.e32_magic[1] = E32MAGIC2;
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| 105 | LXHdr.e32_border = E32LEBO;
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| 106 | LXHdr.e32_worder = E32LEWO;
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| 107 | LXHdr.e32_level = E32LEVEL;
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| 108 | LXHdr.e32_cpu = E32CPU386;
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| 109 | LXHdr.e32_os = NE_OS2;
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| 110 | LXHdr.e32_pagesize = PAGESIZE;
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| 111 | LXHdr.e32_objtab = sizeof(LXHdr);
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| 112 | }
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| 113 |
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| 114 |
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| 115 | /**
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| 116 | * Destructor.
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| 117 | * @status stub
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| 118 | * @author knut st. osmundsen
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| 119 | */
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| 120 | Elf2Lx::~Elf2Lx()
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| 121 | {
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| 122 |
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| 123 | }
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| 124 |
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| 125 |
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| 126 | /**
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| 127 | * Initiates the Elf2Lx object - builds the virtual LX image.
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| 128 | * When this function completes the object is no longer in init-mode.
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| 129 | * @returns NO_ERROR on success.
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| 130 | * ERROR_NOT_ENOUGH_MEMORY
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| 131 | * ERROR_INVALID_EXE_SIGNATURE
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| 132 | * ERROR_BAD_EXE_FORMAT
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| 133 | * Error code returned by ReadAt.
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| 134 | * Error codes from the make* methods.
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| 135 | * @param pszFilename Module filename.
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| 136 | * @precond Called in init-mode.
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| 137 | * @sketch
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| 138 | * 0. pszFilename & pszModuleName.
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| 139 | * 1. Read the Elf header.
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| 140 | * 2. Verify the header.
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| 141 | * 3. Read Program headers.
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| 142 | * 4.
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| 143 | *
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| 144 | * 5.
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| 145 | * 6.
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| 146 | * 7. Start converting the sections by adding the headerobject. (headerobject, see previous chapter).
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| 147 | * 8. Iterate thru the sectiontable converting the section to objects.
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| 148 | * 8a. Convert characteristics to flags
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| 149 | * 8b. Virtual/physical size (see note in code)
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| 150 | * 8c. Add object.
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| 151 | * 9.Find where the TIB fix is to be placed. (see 3.1.1 for placements.) Place the TIB fix.
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| 152 | * 9a. At the end of the header object.
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| 153 | * 9b. After MZ-Header (In the dos stub!).
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| 154 | * 9c.Add separate TIBFix object.
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| 155 | * 10.Add stack object.
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| 156 | * 11.Align section. (Fix which is applied to EXEs/Dlls which contain no fixups and has an
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| 157 | * alignment which is not a multiple of 64Kb. The sections are concatenated into one big object.
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| 158 | * 12.Update the LXHeader with info which is finalized now. (Stacksize, GUI/CUI, characteristics,...)
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| 159 | * 13.Convert exports.
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| 160 | * 14.Convert base relocations (fixups). Remember to add the fixup for RegisterPe2LxDll/Exe.
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| 161 | * 15.Make object table.
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| 162 | * 16.Make object page table.
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| 163 | * 17.Completing the LX header.
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| 164 | * 18.Set offLXFile in the object array.
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| 165 | * 19.The conversion method is completed. Object is now usable.
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| 166 | * 20.Dump virtual LX-file
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| 167 | * return successfully.
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| 168 | * @status Completely implemented; tested.
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| 169 | * @author knut st. osmundsen
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| 170 | */
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| 171 | ULONG Elf2Lx::init(PCSZ pszFilename)
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| 172 | {
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| 173 | APIRET rc;
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| 174 | unsigned cb; /* helper variable, used to hold sizes in bytes. */
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| 175 |
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| 176 | #ifdef DEBUG
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| 177 | if (!fInitTime)
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| 178 | {
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| 179 | printIPE(("init(..) called when not in init mode!\n"));
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| 180 | return ERROR_INITMETHOD_NOT_INITTIME;
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| 181 | }
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| 182 | #endif
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| 183 |
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| 184 | printInf(("Started processing %s\n", pszFilename));
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| 185 |
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| 186 | /*
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| 187 | * 0.pszFilename & pszModuleName.
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| 188 | */
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| 189 | rc = ModuleBase::init(pszFilename);
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| 190 | if (rc != NO_ERROR)
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| 191 | return rc;
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| 192 |
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| 193 | /*
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| 194 | * 1.Read the Elf header.
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| 195 | */
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| 196 | pEhdr = (Elf32_Ehdr*)malloc(sizeof(*pEhdr));
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| 197 | if (pEhdr == NULL)
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| 198 | return ERROR_NOT_ENOUGH_MEMORY;
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| 199 | rc = ReadAt(hFile, pEhdr->e_phoff, paPhdrs, pEhdr->e_phentsize * pEhdr->e_phnum);
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| 200 | if (rc != NO_ERROR)
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| 201 | {
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| 202 | printErr(("Failed to read Elf header\n"));
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| 203 | return rc;
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| 204 | }
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| 205 |
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| 206 | /*
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| 207 | * 2.Check that it is a valid header. Fail if invalid.
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| 208 | */
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| 209 | if (!Elf2Lx::validHeader(pEhdr))
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| 210 | {
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| 211 | printErr(("Not a valid Elf format\n"));
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| 212 | return ERROR_BAD_EXE_FORMAT;
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| 213 | }
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| 214 |
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| 215 | /*
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| 216 | * 3.Read program table.
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| 217 | */
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| 218 | cb = pEhdr->e_phentsize * pEhdr->e_phnum;
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| 219 | paPhdrs = (Elf32_Phdr*)malloc(cb);
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| 220 | if (paPhdrs == NULL)
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| 221 | return ERROR_NOT_ENOUGH_MEMORY;
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| 222 | rc = ReadAt(hFile, pEhdr->e_phoff, paPhdrs, cb);
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| 223 | if (rc != NO_ERROR)
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| 224 | {
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| 225 | printErr(("Failed to read program headers, off=0x%08x, size=0x%08x\n",
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| 226 | pEhdr->e_phoff, cb));
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| 227 | return rc;
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| 228 | }
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| 229 |
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| 230 | /*
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| 231 | * 4.
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| 232 | */
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| 233 |
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| 234 | return rc;
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| 235 | }
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| 236 |
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| 237 |
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| 238 |
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| 239 |
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| 240 | /**
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| 241 | * Check if the passed in header struct is an Elf header valid for
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| 242 | * this system.
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| 243 | * @returns TRUE: valid header.
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| 244 | * FALSE: invalid header.
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| 245 | * @param pEhdr Pointer to elf header.
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| 246 | * @status completely implemented.
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| 247 | * @author knut st. osmundsen (knut.stange.osmundsen@mynd.no)
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| 248 | */
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| 249 | BOOL Elf2Lx::validHeader(Elf32_Ehdr *pEhdr)
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| 250 | {
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| 251 | /*
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| 252 | * Checks.
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| 253 | */
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| 254 | if (*(PULONG)pEhdr == ELFMAGICLSB /* Elf magic */
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| 255 | && pEhdr->e_ident[EI_CLASS] == ELFCLASS32 /* 32-bit format */
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| 256 | && pEhdr->e_ident[EI_DATA] == ELFDATA2LSB /* Little endian */
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| 257 | && pEhdr->e_ident[EI_VERSION] == EV_CURRENT /* Format version */
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| 258 | && (pEhdr->e_type == ET_EXEC || /* Filetype Exec or Library */
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| 259 | pEhdr->e_type == ET_DYN)
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| 260 | && (pEhdr->e_machine == EM_386 || /* Machine type 386 (or 486) */
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| 261 | pEhdr->e_machine == EM_486)
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| 262 | && pEhdr->e_version == EV_CURRENT /* Format version */
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| 263 | && pEhdr->e_flags == EF_386_NONE /* No flags for 386 and 486 */
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| 264 | && pEhdr->e_ehsize >= sizeof(*pEhdr) /* Elf header not smaller than ours. */
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| 265 | && pEhdr->e_phentsize >= sizeof(Elf32_Phdr) /* Program header size not smaller than ours. */
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| 266 | && pEhdr->e_shentsize >= sizeof(Elf32_Shdr) /* Section header size not smaller than ours. */
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| 267 | && pEhdr->e_phnum < 128 /* An image with more that 128 program headers is supicious! */
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| 268 | )
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| 269 | return TRUE;
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| 270 | return FALSE;
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| 271 | }
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| 272 |
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