reactos/lib/ntdll/ldr/startup.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            lib/ntdll/ldr/startup.c
   5  * PURPOSE:         Process startup for PE executables
   6  * PROGRAMMERS:     Jean Michault
   7  *                  Rex Jolliff (rex@lvcablemodem.com)
   8  */
   9
  10 /* INCLUDES *****************************************************************/
  11
  12 #define WIN32_NO_PEHDR
  13 #include <windows.h>
  14 #include <ddk/ntddk.h>
  15 #include <pe.h>
  16 #include <string.h>
  17 #include <wchar.h>
  18 #include <ntdll/ldr.h>
  19 #include <ntdll/rtl.h>
  20
  21 #define NDEBUG
  22 #include <ntdll/ntdll.h>
  23
  24 /* GLOBALS *******************************************************************/
  25
  26 DLL LdrDllListHead;
  27 extern unsigned int _image_base__;
  28
  29 /* FUNCTIONS *****************************************************************/
  30
  31 NTSTATUS LdrMapNTDllForProcess(HANDLE ProcessHandle,
  32                                PHANDLE PtrNTDllSectionHandle)
  33 {
  34    ULONG InitialViewSize;
  35    NTSTATUS Status;
  36    HANDLE NTDllSectionHandle;
  37    PVOID ImageBase;
  38    PIMAGE_NT_HEADERS NTHeaders;
  39    PIMAGE_DOS_HEADER PEDosHeader;
  40
  41    DPRINT("LdrMapNTDllForProcess(ProcessHandle %x)\n",ProcessHandle);
  42
  43    PEDosHeader = (PIMAGE_DOS_HEADER)LdrDllListHead.BaseAddress;
  44    NTHeaders = (PIMAGE_NT_HEADERS)(LdrDllListHead.BaseAddress +
  45                                    PEDosHeader->e_lfanew);
  46
  47    NTDllSectionHandle = LdrDllListHead.SectionHandle;
  48    InitialViewSize = PEDosHeader->e_lfanew + sizeof(IMAGE_NT_HEADERS)
  49      + sizeof(IMAGE_SECTION_HEADER) * NTHeaders->FileHeader.NumberOfSections;
  50    ImageBase = LdrDllListHead.BaseAddress;
  51    DPRINT("Mapping at %x\n",ImageBase);
  52    Status = ZwMapViewOfSection(NTDllSectionHandle,
  53                                ProcessHandle,
  54                                (PVOID *)&ImageBase,
  55                                0,
  56                                InitialViewSize,
  57                                NULL,
  58                                &InitialViewSize,
  59                                0,
  60                                MEM_COMMIT,
  61                                PAGE_READWRITE);
  62    LdrMapSections(ProcessHandle,
  63                   ImageBase,
  64                   NTDllSectionHandle,
  65                   NTHeaders);
  66    *PtrNTDllSectionHandle = NTDllSectionHandle;
  67    return(STATUS_SUCCESS);
  68 }
  69
  70 /*   LdrStartup
  71  * FUNCTION:
  72  *   Handles Process Startup Activities.
  73  * ARGUMENTS:
  74  *   DWORD    ImageBase  The base address of the process image
  75  */
  76 VOID LdrStartup(HANDLE SectionHandle,
  77                 DWORD ImageBase,
  78                 HANDLE NTDllSectionHandle)
  79 {
  80    PEPFUNC EntryPoint;
  81    PIMAGE_DOS_HEADER PEDosHeader;
  82    NTSTATUS Status;
  83    PIMAGE_NT_HEADERS NTHeaders;
  84
  85    dprintf("LdrStartup(ImageBase %x, SectionHandle %x, "
  86            "NTDllSectionHandle %x)\n",ImageBase,
  87            SectionHandle, NTDllSectionHandle);
  88
  89    LdrDllListHead.BaseAddress = (PVOID)&_image_base__;
  90    LdrDllListHead.Prev = &LdrDllListHead;
  91    LdrDllListHead.Next = &LdrDllListHead;
  92    LdrDllListHead.SectionHandle = NTDllSectionHandle;
  93    PEDosHeader = (PIMAGE_DOS_HEADER)LdrDllListHead.BaseAddress;
  94    LdrDllListHead.Headers = (PIMAGE_NT_HEADERS)(LdrDllListHead.BaseAddress +
  95                                                 PEDosHeader->e_lfanew);
  96
  97   /*  If MZ header exists  */
  98   PEDosHeader = (PIMAGE_DOS_HEADER) ImageBase;
  99   if (PEDosHeader->e_magic != IMAGE_DOS_MAGIC ||
 100       PEDosHeader->e_lfanew == 0L ||
 101       *(PULONG)((PUCHAR)ImageBase + PEDosHeader->e_lfanew) != IMAGE_PE_MAGIC)
 102      {
 103         DPRINT("Image has bad header\n");
 104         ZwTerminateProcess(NULL,STATUS_UNSUCCESSFUL);
 105      }
 106
 107    NTHeaders = (PIMAGE_NT_HEADERS)(ImageBase + PEDosHeader->e_lfanew);
 108    __RtlInitHeap((PVOID)HEAP_BASE,
 109                  NTHeaders->OptionalHeader.SizeOfHeapCommit,
 110                  NTHeaders->OptionalHeader.SizeOfHeapReserve);
 111    EntryPoint = LdrPEStartup((PVOID)ImageBase, SectionHandle);
 112
 113    if (EntryPoint == NULL)
 114      {
 115         DPRINT("Failed to initialize image\n");
 116         ZwTerminateProcess(NULL,STATUS_UNSUCCESSFUL);
 117      }
 118
 119    DPRINT("Transferring control to image at %x\n",EntryPoint);
 120    Status = EntryPoint();
 121    ZwTerminateProcess(NtCurrentProcess(),Status);
 122 }