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wine/loader/elf.c
Alexandre Julliard 180a088beb Moved PE header definitions to winnt.h where they belong.
2000-04-18 11:58:24 +00:00

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/*
* UNIX dynamic loader
*
* Currently only supports stuff using the dl* API.
*
* Copyright 1998 Marcus Meissner
*
* FIXME: Small reentrancy problem.
* IDEA(s): could be used to split up shell32,comctl32...
*/
#include "config.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "snoop.h"
#include "process.h"
#include "neexe.h"
#include "heap.h"
#include "module.h"
#include "pe_image.h"
#include "debugtools.h"
#include "winerror.h"
#include "elfdll.h"
DEFAULT_DEBUG_CHANNEL(win32)
#if defined(HAVE_DL_API)
#define UNIX_DLL_ENDING "so"
#define STUBSIZE 4095
#include <dlfcn.h>
static WINE_MODREF *ELF_CreateDummyModule( LPCSTR libname, LPCSTR modname )
{
PIMAGE_DOS_HEADER dh;
PIMAGE_NT_HEADERS nth;
PIMAGE_SECTION_HEADER sh;
WINE_MODREF *wm;
HMODULE hmod;
wm=(WINE_MODREF*)HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*wm) );
wm->type = MODULE32_ELF;
/* FIXME: hmm, order? */
wm->next = PROCESS_Current()->modref_list;
PROCESS_Current()->modref_list = wm;
wm->modname = HEAP_strdupA( GetProcessHeap(), 0, modname );
wm->filename = HEAP_strdupA( GetProcessHeap(), 0, libname );
wm->short_modname = wm->modname;
wm->short_filename = wm->filename;
hmod = (HMODULE)HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
sizeof(IMAGE_DOS_HEADER) +
sizeof(IMAGE_NT_HEADERS) +
sizeof(IMAGE_SECTION_HEADER) + 100 );
dh = (PIMAGE_DOS_HEADER)hmod;
dh->e_magic = IMAGE_DOS_SIGNATURE;
dh->e_lfanew = sizeof(IMAGE_DOS_HEADER);
nth = PE_HEADER(hmod);
nth->Signature = IMAGE_NT_SIGNATURE;
nth->FileHeader.Machine = IMAGE_FILE_MACHINE_I386;
nth->FileHeader.NumberOfSections = 1;
nth->FileHeader.SizeOfOptionalHeader = sizeof(IMAGE_OPTIONAL_HEADER);
nth->FileHeader.Characteristics =
IMAGE_FILE_RELOCS_STRIPPED|IMAGE_FILE_LINE_NUMS_STRIPPED|
IMAGE_FILE_LOCAL_SYMS_STRIPPED|IMAGE_FILE_32BIT_MACHINE|
IMAGE_FILE_DLL|IMAGE_FILE_DEBUG_STRIPPED;
nth->OptionalHeader.Magic = IMAGE_NT_OPTIONAL_HDR_MAGIC;
nth->OptionalHeader.SizeOfCode = 0;
nth->OptionalHeader.SizeOfInitializedData = 0;
nth->OptionalHeader.SizeOfUninitializedData = 0;
nth->OptionalHeader.AddressOfEntryPoint = 0;
nth->OptionalHeader.BaseOfCode = 0;
nth->OptionalHeader.MajorOperatingSystemVersion = 4;
nth->OptionalHeader.MajorImageVersion = 4;
nth->OptionalHeader.SizeOfImage = 0;
nth->OptionalHeader.SizeOfHeaders = 0;
nth->OptionalHeader.Subsystem = IMAGE_SUBSYSTEM_NATIVE;
nth->OptionalHeader.DllCharacteristics = 0;
nth->OptionalHeader.NumberOfRvaAndSizes = 0;
/* allocate one code section that crosses the whole process range
* (we could find out from internal tables ... hmm )
*/
sh=(PIMAGE_SECTION_HEADER)(nth+1);
strcpy(sh->Name,".text");
sh->Misc.VirtualSize = 0x7fffffff;
sh->VirtualAddress = 0x42; /* so snoop can use it ... */
sh->SizeOfRawData = 0x7fffffff;
sh->PointerToRawData = 0;
sh->Characteristics = IMAGE_SCN_CNT_CODE|IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ;
wm->module = hmod;
return wm;
}
WINE_MODREF *ELF_LoadLibraryExA( LPCSTR libname, DWORD flags)
{
WINE_MODREF *wm;
char *modname,*s,*t,*x;
LPVOID *dlhandle;
t = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
strlen(libname) + strlen("lib.so") + 1 );
*t = '\0';
/* copy path to tempvar ... */
s=strrchr(libname,'/');
if (!s)
s=strrchr(libname,'\\');
if (s) {
s++; /* skip / or \ */
/* copy everything up to s-1 */
memcpy(t,libname,s-libname);
t[s-libname]= '\0';
} else
s = (LPSTR)libname;
modname = s;
/* append "lib" foo ".so" */
strcat(t,"lib");
x = t+strlen(t);
strcat(t,s);
s = strchr(x,'.');
if (s) {
while (s) {
if (!strcasecmp(s,".dll")) {
strcpy(s+1,UNIX_DLL_ENDING);
break;
}
s=strchr(s+1,'.');
}
} else {
strcat(x,"."UNIX_DLL_ENDING);
}
/* FIXME: make UNIX filename from DOS fn? */
/* ... and open it */
dlhandle = ELFDLL_dlopen(t,RTLD_NOW);
if (!dlhandle) {
HeapFree( GetProcessHeap(), 0, t );
SetLastError( ERROR_FILE_NOT_FOUND );
return NULL;
}
wm = ELF_CreateDummyModule( t, modname );
wm->binfmt.elf.dlhandle = dlhandle;
SNOOP_RegisterDLL(wm->module,libname,STUBSIZE/sizeof(ELF_STDCALL_STUB));
return wm;
}
FARPROC ELF_FindExportedFunction( WINE_MODREF *wm, LPCSTR funcName)
{
LPVOID fun;
int i,nrofargs = 0;
ELF_STDCALL_STUB *stub;
assert(wm->type == MODULE32_ELF);
if (!HIWORD(funcName)) {
ERR("Can't import from UNIX dynamic libs by ordinal, sorry.\n");
return (FARPROC)0;
}
fun = dlsym(wm->binfmt.elf.dlhandle,funcName);
/* we sometimes have an excess '_' at the beginning of the name */
if (!fun && (funcName[0]=='_')) {
funcName++ ;
fun = dlsym(wm->binfmt.elf.dlhandle,funcName);
}
if (!fun) {
/* Function@nrofargs usually marks a stdcall function
* with nrofargs bytes that are popped at the end
*/
if (strchr(funcName,'@')) {
LPSTR t,fn = HEAP_strdupA( GetProcessHeap(), 0, funcName );
t = strchr(fn,'@');
*t = '\0';
nrofargs = 0;
sscanf(t+1,"%d",&nrofargs);
fun = dlsym(wm->binfmt.elf.dlhandle,fn);
HeapFree( GetProcessHeap(), 0, fn );
}
}
/* We sometimes have Win32 dlls implemented using stdcall but UNIX
* dlls using cdecl. If we find out the number of args the function
* uses, we remove them from the stack using two small stubs.
*/
if (!wm->binfmt.elf.stubs) {
/* one page should suffice */
wm->binfmt.elf.stubs = VirtualAlloc(NULL,STUBSIZE,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
memset(wm->binfmt.elf.stubs,0,STUBSIZE);
}
stub = wm->binfmt.elf.stubs;
for (i=0;i<STUBSIZE/sizeof(ELF_STDCALL_STUB);i++) {
if (!stub->origfun)
break;
if (stub->origfun == (DWORD)fun)
break;
stub++;
}
if (i==STUBSIZE/sizeof(ELF_STDCALL_STUB)) {
ERR("please report, that there are not enough slots for stdcall stubs in the ELF loader.\n");
assert(i<STUBSIZE/sizeof(ELF_STDCALL_STUB));
}
if (!stub->origfun)
stub->origfun=(DWORD)fun; /* just a marker */
if (fun && nrofargs) { /* we don't need it for 0 args */
/* Selfmodifying entry/return stub for stdcall -> cdecl
* conversion.
* - Pop returnaddress directly into our return code
* popl <into code below>
* - Replace it by pointer to start of our returncode
* push $newret
* - And call the original function
* jmp $orgfun
* - Remove the arguments no longer needed
* newret: add esp, <nrofargs>
* - Push the original returnvalue on the stack
* pushl <poppedvalue>
* - And return to it.
* ret
*/
/* FIXME: The function stub is not reentrant. */
((LPBYTE)&(stub->popl))[0] = 0x8f;
((LPBYTE)&(stub->popl))[1] = 0x05;
stub->addr_popped = (DWORD)&(stub->oldret);
stub->pushl1 = 0x68;
stub->newret = (DWORD)&(stub->addesp);
stub->pushl2 = 0x68;
stub->origfun = (DWORD)fun;
stub->ret1 = 0xc3;
((LPBYTE)&(stub->addesp))[0]=0x83;
((LPBYTE)&(stub->addesp))[1]=0xc4;
stub->nrofargs = nrofargs;
stub->pushl3 = 0x68;
/* filled out by entrycode */
stub->oldret = 0xdeadbeef;
stub->ret2 = 0xc3;
fun=(FARPROC)stub;
}
if (!fun) {
FIXME("function %s not found: %s\n",funcName,dlerror());
return fun;
}
fun = SNOOP_GetProcAddress(wm->module,funcName,stub-wm->binfmt.elf.stubs,fun);
return (FARPROC)fun;
}
/***************************************************************************
* ELF_UnloadLibrary
*
* Unload the elf library and free the modref
*/
void ELF_UnloadLibrary(WINE_MODREF *wm)
{
/* FIXME: do something here */
}
#else
WINE_MODREF *ELF_LoadLibraryExA( LPCSTR libname, DWORD flags)
{
return NULL;
}
void ELF_UnloadLibrary(WINE_MODREF *wm)
{
}
FARPROC ELF_FindExportedFunction( WINE_MODREF *wm, LPCSTR funcName)
{
return (FARPROC)0;
}
#endif
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