loader/pe_image.c

#ifndef WINELIB
/* 
 *  Copyright	1994	Eric Youndale & Erik Bos
 *  Copyright	1995	Martin von Löwis
 *  Copyright   1996    Marcus Meissner
 *
 *	based on Eric Youndale's pe-test and:
 *
 *	ftp.microsoft.com:/pub/developer/MSDN/CD8/PEFILE.ZIP
 * make that:
 *	ftp.microsoft.com:/developr/MSDN/OctCD/PEFILE.ZIP
 */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include "windows.h"
#include "winbase.h"
#include "callback.h"
#include "neexe.h"
#include "peexe.h"
#include "pe_image.h"
#include "module.h"
#include "global.h"
#include "task.h"
#include "ldt.h"
#include "registers.h"
#include "stddebug.h"
#include "debug.h"
#include "debugger.h"
#include "xmalloc.h"

void my_wcstombs(char * result, u_short * source, int len)
{
  while(len--) {
    /* this used to be isascii, but see isascii implementation in Linux'
	   ctype.h */
    if(*source<255) *result++ = *source++;
    else {
      printf("Unable to handle unicode right now\n");
      exit(0);
    }
  };
}

#if 0
char * xmmap(char * vaddr, unsigned int v_size, unsigned int r_size,
	int prot, int flags, int fd, unsigned int file_offset)
{
  char * result;
  /* .bss has no associated storage in the PE file */
  if(r_size)
    v_size=r_size;
  else
#if defined(__svr4__) || defined(_SCO_DS)
    fprintf(stderr,"xmmap: %s line %d doesn't support MAP_ANON\n",__FILE__, __LINE__);
#else
    flags |= MAP_ANON;
#endif
  result = mmap(vaddr, v_size, prot, flags, fd, file_offset);
  if((unsigned int) result != 0xffffffff) return result;

  /* Sigh.  Alignment must be wrong for mmap.  Do this the hard way. */
  if(!(flags & MAP_FIXED)) {
    vaddr = (char *)0x40000000;
    flags |= MAP_FIXED;
  };

  mmap(vaddr, v_size, prot, MAP_ANONYMOUS | flags, 0, 0);
  lseek(fd, file_offset, SEEK_SET);
  read(fd, vaddr, v_size);
  return vaddr;
};
#endif

void dump_exports(struct PE_Export_Directory * pe_exports, unsigned int load_addr)
{ 
  char		*Module;
  int		i;
  u_short	*ordinal;
  u_long	*function,*functions;
  u_char	**name,*ename;
  char		buffer[1000];
  DBG_ADDR	daddr;

  daddr.seg = 0;
  Module = ((char*)load_addr)+pe_exports->Name;
  dprintf_win32(stddeb,"\n*******EXPORT DATA*******\nModule name is %s, %ld functions, %ld names\n", 
	 Module,
	 pe_exports->Number_Of_Functions,
	 pe_exports->Number_Of_Names);

  ordinal=(u_short*)(((char*)load_addr)+(int)pe_exports->Address_Of_Name_Ordinals);
  functions=function=(u_long*)(((char*)load_addr)+(int)pe_exports->AddressOfFunctions);
  name=(u_char**)(((char*)load_addr)+(int)pe_exports->AddressOfNames);

  dprintf_win32(stddeb,"%-32s Ordinal Virt Addr\n", "Function Name");
  for (i=0;i<pe_exports->Number_Of_Functions;i++) {
      if (i<pe_exports->Number_Of_Names) {
	  ename=(char*)(((char*)load_addr)+(int)*name++);
	  dprintf_win32(stddeb,"%-32s %4d    %8.8lx (%8.8lx)\n",ename,*ordinal,functions[*ordinal],*function);
	  sprintf(buffer,"%s.%s",Module,ename);
	  daddr.off=load_addr+functions[*ordinal];
	  ordinal++;
	  function++;
      } else {
      	  /* ordinals/names no longer valid, but we still got functions */
	  dprintf_win32(stddeb,"%-32s %4s    %8s %8.8lx\n","","","",*function);
	  sprintf(buffer,"%s.%d",Module,i);
	  daddr.off=load_addr+*functions;
	  function++;
      }
      DEBUG_AddSymbol(buffer,&daddr, NULL);
  }
}

/* Look up the specified function or ordinal in the exportlist:
 * If it is a string:
 * 	- look up the name in the Name list. 
 *	- look up the ordinal with that index.
 *	- use the ordinal as offset into the functionlist
 * If it is a ordinal:
 *	- use ordinal-pe_export->Base as offset into the functionlist
 */
FARPROC32 PE_FindExportedFunction(struct pe_data *pe, LPCSTR funcName)
{
	struct PE_Export_Directory * exports = pe->pe_export;
	unsigned load_addr = pe->load_addr;
	u_short * ordinal;
	u_long * function;
	u_char ** name, *ename;
	int i;

	if (HIWORD(funcName))
		dprintf_win32(stddeb,"PE_FindExportedFunction(%s)\n",funcName);
	else
		dprintf_win32(stddeb,"PE_FindExportedFunction(%d)\n",(int)funcName);
	if (!exports)
		return NULL;
	ordinal=(u_short*)(((char*)load_addr)+(int)exports->Address_Of_Name_Ordinals);
	function=(u_long*)(((char*)load_addr)+(int)exports->AddressOfFunctions);
	name=(u_char **)(((char*)load_addr)+(int)exports->AddressOfNames);
	if (HIWORD(funcName)) {
		for(i=0; i<exports->Number_Of_Names; i++) {
			ename=(char*)(((char*)load_addr)+(int)*name);
			if(!strcmp(ename,funcName))
				return (FARPROC32)(load_addr+function[*ordinal]);
			ordinal++;
			name++;
		}
	} else {
		if (LOWORD(funcName)-exports->Base > exports->Number_Of_Functions) {
			dprintf_win32(stddeb,"	ordinal %d out of range!\n",
                                      LOWORD(funcName));
			return NULL;
		}
		return (FARPROC32)(load_addr+function[(int)funcName-exports->Base]);
	}
	return NULL;
}

void 
fixup_imports (struct pe_data *pe, HMODULE16 hModule)
{
    struct PE_Import_Directory *pe_imp;
    int	fixup_failed = 0;
    unsigned int load_addr = pe->load_addr;
    int i;
    NE_MODULE *ne_mod;
    HMODULE16 *mod_ptr;

    /* OK, now dump the import list */
    dprintf_win32 (stddeb, "\nDumping imports list\n");

    /* first, count the number of imported non-internal modules */
    pe_imp = pe->pe_import;
    for (i = 0; pe_imp->ModuleName; pe_imp++)
	i++;

    /* Now, allocate memory for dlls_to_init */
    ne_mod = GlobalLock16 (hModule);
    ne_mod->dlls_to_init = GLOBAL_Alloc(GMEM_ZEROINIT, (i+1)*sizeof(HMODULE16),
                                        hModule, FALSE, FALSE, FALSE);
    mod_ptr = GlobalLock16 (ne_mod->dlls_to_init);
    /* load the modules and put their handles into the list */
    for (i = 0, pe_imp = pe->pe_import; pe_imp->ModuleName; pe_imp++) {
	char *name = (char *) load_addr + pe_imp->ModuleName;
	mod_ptr[i] = LoadModule (name, (LPVOID) - 1);
	if (mod_ptr[i] <= (HMODULE16) 32) {
	    char *p, buffer[256];

	    /* Try with prepending the path of the current module */
	    GetModuleFileName16 (hModule, buffer, sizeof (buffer));
	    if (!(p = strrchr (buffer, '\\')))
		p = buffer;
	    strcpy (p + 1, name);
	    mod_ptr[i] = LoadModule (buffer, (LPVOID) - 1);
	}
	if (mod_ptr[i] <= (HMODULE16) 32) {
	    fprintf (stderr, "Module %s not found\n", name);
	    exit (0);
	}
	i++;
    }
    pe_imp = pe->pe_import;
    while (pe_imp->ModuleName) {
	char *Module;
	struct pe_import_name *pe_name;
	unsigned int *import_list, *thunk_list;

	Module = ((char *) load_addr) + pe_imp->ModuleName;
	dprintf_win32 (stddeb, "%s\n", Module);

	if (pe_imp->Import_List != 0) {	/* original microsoft style */
	    dprintf_win32 (stddeb, "Microsoft style imports used\n");
	    import_list = (unsigned int *)(((unsigned int)load_addr)+pe_imp->Import_List);
	    thunk_list = (unsigned int *)(((unsigned int)load_addr)+pe_imp->Thunk_List);

	    while (*import_list) {
		pe_name = (struct pe_import_name *) ((int) load_addr + ((unsigned) *import_list & ~0x80000000));
		if ((unsigned) *import_list & 0x80000000) {
		    int ordinal = *import_list & (0x80000000 - 1);
		    dprintf_win32 (stddeb, "--- Ordinal %s,%d\n", Module, ordinal);
		    *thunk_list = (unsigned)GetProcAddress32(MODULE_FindModule (Module),
		    				   (LPCSTR) ordinal);
		    if (!*thunk_list) {
			fprintf(stderr,"No implementation for %s.%d, setting to NULL\n",
				Module, ordinal);
			/* fixup_failed=1; */
		    }
		} else {		/* import by name */
		    dprintf_win32 (stddeb, "--- %s %s.%d\n", pe_name->Name, Module, pe_name->Hint);
		    *thunk_list = (unsigned)GetProcAddress32(MODULE_FindModule (Module),
						   pe_name->Name);
		    if (!*thunk_list) {
			fprintf(stderr, "No implementation for %s.%d(%s), setting to NULL\n",
				Module, pe_name->Hint, pe_name->Name);
			/* fixup_failed=1; */
		    }
		}
		import_list++;
		thunk_list++;
	    }
	} else {			/* Borland style */
	    dprintf_win32 (stddeb, "Borland style imports used\n");
	    thunk_list = (unsigned int *)(((unsigned int)load_addr)+pe_imp->Thunk_List);
	    while (*thunk_list) {
		pe_name=(struct pe_import_name *)((int)load_addr+*thunk_list);
		if ((unsigned) pe_name & 0x80000000) {
		    /* not sure about this branch, but it seems to work */
		    int ordinal = *thunk_list & ~0x80000000;
		    dprintf_win32(stddeb,"--- Ordinal %s.%d\n",Module,ordinal);
		    *thunk_list = (unsigned)GetProcAddress32(MODULE_FindModule (Module),
						   (LPCSTR) ordinal);
		    if (!*thunk_list) {
			fprintf(stderr, "No implementation for %s.%d, setting to NULL\n",
				Module,ordinal);
			/* fixup_failed=1; */
		    }
		} else {
		    dprintf_win32(stddeb,"--- %s %s.%d\n",
		   		  pe_name->Name, Module, pe_name->Hint);
		    *thunk_list = (unsigned)GetProcAddress32(MODULE_FindModule(Module),
						   pe_name->Name);
		    if (!*thunk_list) {
		    	fprintf(stderr, "No implementation for %s.%d, setting to NULL\n",
				Module, pe_name->Hint);
		    	/* fixup_failed=1; */
		    }
		}
		thunk_list++;
	    }
	}
	pe_imp++;
    }
    if (fixup_failed) exit(1);
}

static void calc_vma_size(struct pe_data *pe)
{
  int i;

  dprintf_win32(stddeb, "Dump of segment table\n");
  dprintf_win32(stddeb, "   Name    VSz  Vaddr     SzRaw   Fileadr  *Reloc *Lineum #Reloc #Linum Char\n");
  for(i=0; i< pe->pe_header->coff.NumberOfSections; i++)
    {
      dprintf_win32(stddeb, "%8s: %4.4lx %8.8lx %8.8lx %8.8lx %8.8lx %8.8lx %4.4x %4.4x %8.8lx\n", 
	     pe->pe_seg[i].Name, 
	     pe->pe_seg[i].Virtual_Size,
	     pe->pe_seg[i].Virtual_Address,
	     pe->pe_seg[i].Size_Of_Raw_Data,
	     pe->pe_seg[i].PointerToRawData,
	     pe->pe_seg[i].PointerToRelocations,
	     pe->pe_seg[i].PointerToLinenumbers,
	     pe->pe_seg[i].NumberOfRelocations,
	     pe->pe_seg[i].NumberOfLinenumbers,
	     pe->pe_seg[i].Characteristics);
	  pe->vma_size = MAX(pe->vma_size,
	  		pe->pe_seg[i].Virtual_Address + 
			pe->pe_seg[i].Size_Of_Raw_Data);
    }
}

static void do_relocations(struct pe_data *pe)
{
	int delta = pe->load_addr - pe->base_addr;
	struct PE_Reloc_Block *r = pe->pe_reloc;
	int hdelta = (delta >> 16) & 0xFFFF;
	int ldelta = delta & 0xFFFF;
	/* int reloc_size = */
	if(delta == 0)
		/* Nothing to do */
		return;
	while(r->PageRVA)
	{
		char *page = (char*)pe->load_addr + r->PageRVA;
		int count = (r->BlockSize - 8)/2;
		int i;
		dprintf_fixup(stddeb, "%x relocations for page %lx\n",
			count, r->PageRVA);
		/* patching in reverse order */
		for(i=0;i<count;i++)
		{
			int offset = r->Relocations[i] & 0xFFF;
			int type = r->Relocations[i] >> 12;
			dprintf_fixup(stddeb,"patching %x type %x\n", offset, type);
			switch(type)
			{
			case IMAGE_REL_BASED_ABSOLUTE: break;
			case IMAGE_REL_BASED_HIGH:
				*(short*)(page+offset) += hdelta;
				break;
			case IMAGE_REL_BASED_LOW:
				*(short*)(page+offset) += ldelta;
				break;
			case IMAGE_REL_BASED_HIGHLOW:
#if 1
				*(int*)(page+offset) += delta;
#else
				{ int h=*(unsigned short*)(page+offset);
				  int l=r->Relocations[++i];
				  *(unsigned int*)(page + offset) = (h<<16) + l + delta;
				}
#endif
				break;
			case IMAGE_REL_BASED_HIGHADJ:
				fprintf(stderr, "Don't know what to do with IMAGE_REL_BASED_HIGHADJ\n");
				break;
			case IMAGE_REL_BASED_MIPS_JMPADDR:
				fprintf(stderr, "Is this a MIPS machine ???\n");
				break;
			default:
				fprintf(stderr, "Unknown fixup type\n");
				break;
			}
		}
		r = (struct PE_Reloc_Block*)((char*)r + r->BlockSize);
	}
}
		

	
	

/**********************************************************************
 *			PE_LoadImage
 * Load one PE format executable into memory
 */
static struct pe_data *PE_LoadImage( int fd, HMODULE16 hModule, WORD offset )
{
    struct pe_data *pe;
    int i, result;
    int load_addr;
    struct Directory dir;
    char	buffer[200];
    DBG_ADDR	daddr;

	daddr.seg=0;

	pe = xmalloc(sizeof(struct pe_data));
	memset(pe,0,sizeof(struct pe_data));
	pe->pe_header = xmalloc(sizeof(struct pe_header_s));

	/* read PE header */
	lseek( fd, offset, SEEK_SET);
	read( fd, pe->pe_header, sizeof(struct pe_header_s));

/* FIXME: this is a *horrible* hack to make COMDLG32.DLL load OK. The
problem needs to be fixed properly at some stage */

	if (pe->pe_header->opt_coff.NumberOfRvaAndSizes != 16) {
		printf("Short PE Header!!!\n");
		lseek( fd, -(16 - pe->pe_header->opt_coff.NumberOfRvaAndSizes) * sizeof (struct Directory), SEEK_CUR);
	}

/* horrible hack ends !!! */

	/* read sections */
	pe->pe_seg = xmalloc(sizeof(struct pe_segment_table) * 
				   pe->pe_header->coff.NumberOfSections);
	read( fd, pe->pe_seg, sizeof(struct pe_segment_table) * 
			pe->pe_header->coff.NumberOfSections);

	load_addr = pe->pe_header->opt_coff.BaseOfImage;
	pe->base_addr=load_addr;
	pe->vma_size=0;
	dprintf_win32(stddeb, "Load addr is %x\n",load_addr);
	calc_vma_size(pe);

	/* We use malloc here, while a huge part of that address space does
	   not be supported by actual memory. It has to be contiguous, though.
	   I don't know if mmap("/dev/null"); would do any better.
	   What I'd really like to do is a Win32 style VirtualAlloc/MapViewOfFile
	   sequence */
	load_addr = pe->load_addr = (int)xmalloc(pe->vma_size);
	dprintf_win32(stddeb, "Load addr is really %x, range %x\n",
		pe->load_addr, pe->vma_size);


	for(i=0; i < pe->pe_header->coff.NumberOfSections; i++)
	{
		/* load only non-BSS segments */
		if(pe->pe_seg[i].Characteristics & 
			~ IMAGE_SCN_TYPE_CNT_UNINITIALIZED_DATA)
		if(lseek(fd,pe->pe_seg[i].PointerToRawData,SEEK_SET) == -1
		|| read(fd,(char *)load_addr + pe->pe_seg[i].Virtual_Address,
				pe->pe_seg[i].Size_Of_Raw_Data) 
				!= pe->pe_seg[i].Size_Of_Raw_Data)
		{
			fprintf(stderr,"Failed to load section %x\n", i);
			exit(0);
		}
		result = load_addr + pe->pe_seg[i].Virtual_Address;
#if 0
	if(!load_addr) {
		
		result = (int)xmmap((char *)0, pe->pe_seg[i].Virtual_Size,
			pe->pe_seg[i].Size_Of_Raw_Data, 7,
			MAP_PRIVATE, fd, pe->pe_seg[i].PointerToRawData);
		load_addr = (unsigned int) result -  pe->pe_seg[i].Virtual_Address;
	} else {
		result = (int)xmmap((char *) load_addr + pe->pe_seg[i].Virtual_Address, 
			  pe->pe_seg[i].Virtual_Size,
		      pe->pe_seg[i].Size_Of_Raw_Data, 7, MAP_PRIVATE | MAP_FIXED, 
		      fd, pe->pe_seg[i].PointerToRawData);
	}
	if(result==-1){
		fprintf(stderr,"Could not load section %x to desired address %lx\n",
			i, load_addr+pe->pe_seg[i].Virtual_Address);
		fprintf(stderr,"Need to implement relocations now\n");
		exit(0);
	}
#endif

        if(strcmp(pe->pe_seg[i].Name, ".bss") == 0)
            memset((void *)result, 0, 
                   pe->pe_seg[i].Virtual_Size ?
                   pe->pe_seg[i].Virtual_Size :
                   pe->pe_seg[i].Size_Of_Raw_Data);

	if(strcmp(pe->pe_seg[i].Name, ".idata") == 0)
		pe->pe_import = (struct PE_Import_Directory *) result;

	if(strcmp(pe->pe_seg[i].Name, ".edata") == 0)
		pe->pe_export = (struct PE_Export_Directory *) result;

	if(strcmp(pe->pe_seg[i].Name, ".rsrc") == 0)
	    pe->pe_resource = (struct PE_Resource_Directory *) result;

	if(strcmp(pe->pe_seg[i].Name, ".reloc") == 0)
		pe->pe_reloc = (struct PE_Reloc_Block *) result;

	}

	/* There is word that the actual loader does not care about the
	   section names, and only goes for the DataDirectory */
	dir=pe->pe_header->opt_coff.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
	if(dir.Size)
	{
		if(pe->pe_export && 
			(int)pe->pe_export!=load_addr+dir.Virtual_address)
			fprintf(stderr,"wrong export directory??\n");
		/* always trust the directory */
		pe->pe_export = (void *)(load_addr+dir.Virtual_address);
	}

	dir=pe->pe_header->opt_coff.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
	if(dir.Size)
	{
		if(pe->pe_import && 
			(int)pe->pe_import!=load_addr+dir.Virtual_address)
			fprintf(stderr,"wrong import directory??\n");
		pe->pe_import = (void *)(load_addr+dir.Virtual_address);
	}

	dir=pe->pe_header->opt_coff.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
	if(dir.Size)
	{
		if(pe->pe_resource && 
			(int)pe->pe_resource!=load_addr+dir.Virtual_address)
			fprintf(stderr,"wrong resource directory??\n");
		pe->pe_resource = (void *)(load_addr+dir.Virtual_address);
	}

	dir=pe->pe_header->opt_coff.DataDirectory[IMAGE_FILE_BASE_RELOCATION_TABLE];
	if(dir.Size)
	{
		if(pe->pe_reloc && 
			(int)pe->pe_reloc!=load_addr+dir.Virtual_address)
			fprintf(stderr,"wrong relocation list??\n");
		pe->pe_reloc = (void *)(load_addr+dir.Virtual_address);
	}

	if(pe->pe_header->opt_coff.DataDirectory
		[IMAGE_FILE_EXCEPTION_DIRECTORY].Size)
		dprintf_win32(stdnimp,"Exception directory ignored\n");

	if(pe->pe_header->opt_coff.DataDirectory
		[IMAGE_FILE_SECURITY_DIRECTORY].Size)
		dprintf_win32(stdnimp,"Security directory ignored\n");

	if(pe->pe_header->opt_coff.DataDirectory
		[IMAGE_FILE_DEBUG_DIRECTORY].Size)
	  {
	    DEBUG_RegisterDebugInfo(fd, pe, load_addr, 
			pe->pe_header->opt_coff.DataDirectory[IMAGE_FILE_DEBUG_DIRECTORY].Virtual_address,
			pe->pe_header->opt_coff.DataDirectory[IMAGE_FILE_DEBUG_DIRECTORY].Size);
	  }

	if(pe->pe_header->opt_coff.DataDirectory
		[IMAGE_FILE_DESCRIPTION_STRING].Size)
		dprintf_win32(stdnimp,"Description string ignored\n");

	if(pe->pe_header->opt_coff.DataDirectory
		[IMAGE_FILE_MACHINE_VALUE].Size)
		dprintf_win32(stdnimp,"Machine Value ignored\n");

	if(pe->pe_header->opt_coff.DataDirectory
		[IMAGE_FILE_THREAD_LOCAL_STORAGE].Size)
		 dprintf_win32(stdnimp,"Thread local storage ignored\n");

	if(pe->pe_header->opt_coff.DataDirectory
		[IMAGE_FILE_CALLBACK_DIRECTORY].Size)
		dprintf_win32(stdnimp,"Callback directory ignored\n");


	if(pe->pe_reloc) do_relocations(pe);
	if(pe->pe_import) fixup_imports(pe, hModule);
	if(pe->pe_export) dump_exports(pe->pe_export,load_addr);
  		
	if (pe->pe_export) {
		/* add start of sections as debugsymbols */
		for(i=0;i<pe->pe_header->coff.NumberOfSections;i++) {
			sprintf(buffer,"%s.%s",
				((char*)load_addr)+pe->pe_export->Name,
				pe->pe_seg[i].Name
			);
			daddr.off=load_addr+pe->pe_seg[i].Virtual_Address;
			DEBUG_AddSymbol(buffer,&daddr, NULL);
		}
		/* add entry point */
		sprintf(buffer,"%s.EntryPoint",((char*)load_addr)+pe->pe_export->Name);
		daddr.off=load_addr+pe->pe_header->opt_coff.AddressOfEntryPoint;
		DEBUG_AddSymbol(buffer,&daddr, NULL);
		/* add start of DLL */
		daddr.off=load_addr;
		DEBUG_AddSymbol(((char*)load_addr)+pe->pe_export->Name,&daddr,
				NULL);
	}
        return pe;
}

HINSTANCE16 MODULE_CreateInstance(HMODULE16 hModule,LOADPARAMS *params);
void InitTask( SIGCONTEXT *context );

HINSTANCE16 PE_LoadModule( int fd, OFSTRUCT *ofs, LOADPARAMS* params )
{
    HMODULE16 hModule;
    HINSTANCE16 hInstance;
    NE_MODULE *pModule;
    struct mz_header_s mz_header;

    if ((hModule = MODULE_CreateDummyModule( ofs )) < 32) return hModule;
    pModule = (NE_MODULE *)GlobalLock16( hModule );
    pModule->flags = NE_FFLAGS_WIN32;

    lseek( fd, 0, SEEK_SET );
    read( fd, &mz_header, sizeof(mz_header) );

    pModule->pe_module = PE_LoadImage( fd, hModule, mz_header.ne_offset );

    hInstance = MODULE_CreateInstance( hModule, params );

    if (!(pModule->pe_module->pe_header->coff.Characteristics & IMAGE_FILE_DLL))
    {
        TASK_CreateTask( hModule, hInstance, 0,
                         params->hEnvironment,
                         (LPSTR)PTR_SEG_TO_LIN( params->cmdLine ),
                         *((WORD*)PTR_SEG_TO_LIN(params->showCmd) + 1) );
    }
    return hInstance;
}

int PE_UnloadImage( HMODULE16 hModule )
{
	printf("PEunloadImage() called!\n");
	/* free resources, image, unmap */
	return 1;
}

static void PE_InitDLL(HMODULE16 hModule)
{
    NE_MODULE *pModule;
    PE_MODULE *pe;

    hModule = GetExePtr(hModule);
    if (!(pModule = MODULE_GetPtr(hModule))) return;
    if (!(pModule->flags & NE_FFLAGS_WIN32) || !(pe = pModule->pe_module))
        return;

    /* FIXME: What is the correct value for parameter 3? 
     *	      (the MSDN library JAN96 says 'reserved for future use')
     */
        
    /* Is this a library? */
    if (pe->pe_header->coff.Characteristics & IMAGE_FILE_DLL)
    {
        printf("InitPEDLL() called!\n");
        CallDLLEntryProc32( (FARPROC32)(pe->load_addr + 
                                  pe->pe_header->opt_coff.AddressOfEntryPoint),
                            hModule, DLL_PROCESS_ATTACH, -1 );
    }
}


/* FIXME: This stuff is all on a "well it works" basis. An implementation
based on some kind of documentation would be greatly appreciated :-) */

typedef struct _TEB
{
    void        *Except;	/* 00 */
    void        *stack;		/* 04 */
    int	        dummy1[4];	/* 08 */
    struct _TEB *TEBDSAlias;	/* 18 */
    int	        dummy2[2];	/* 1C */
    int	        taskid;		/* 24 */
    int		dummy3[2];	/* 28 */
    LPBYTE	process;	/* 30 */ /* points to current process struct */
} TEB;

/* the current process structure. Only the processheap is of interest (off 0x18) */
struct {
	DWORD		dummy[6];
	HANDLE32	procheap; /* 18: Process Heap */
} dummyprocess;

void PE_InitTEB(int hTEB)
{
    TDB *pTask;
    TEB *pTEB;

    pTask = (TDB *)(GlobalLock16(GetCurrentTask() & 0xffff));
    pTEB  = (TEB *)(GlobalLock16(hTEB));
    pTEB->stack = (void *)pTask->esp;
    pTEB->Except = (void *)(-1); 
    pTEB->TEBDSAlias = pTEB;
    pTEB->taskid = getpid();

    dummyprocess.procheap = GetProcessHeap();
    pTEB->process = &dummyprocess;
}

VOID
NtCurrentTeb(CONTEXT *context) {
	context->Eax = GlobalLock16(LOWORD(context->SegFs));
}

void PE_InitializeDLLs(HMODULE16 hModule)
{
	NE_MODULE *pModule;
	HMODULE16 *pDLL;
	pModule = MODULE_GetPtr( GetExePtr(hModule) );
	if (pModule->dlls_to_init)
	{
		HGLOBAL16 to_init = pModule->dlls_to_init;
		pModule->dlls_to_init = 0;
		for (pDLL = (HMODULE16 *)GlobalLock16( to_init ); *pDLL; pDLL++)
		{
			PE_InitializeDLLs( *pDLL );
			PE_InitDLL( *pDLL );
		}
		GlobalFree16( to_init );
	}
	PE_InitDLL( hModule );
}
#endif /* WINELIB */