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Sweden-Number/loader/elf.c

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C
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/*
* UNIX dynamic loader
*
* Currently only supports stuff using the dl* API.
*
* Copyright 1998 Marcus Meissner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* FIXME: Small reentrancy problem.
* IDEA(s): could be used to split up shell32,comctl32...
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "snoop.h"
#include "file.h"
#include "wine/debug.h"
#include "winerror.h"
WINE_DEFAULT_DEBUG_CHANNEL(win32);
typedef struct {
WORD popl WINE_PACKED; /* 0x8f 0x05 */
DWORD addr_popped WINE_PACKED;/* ... */
BYTE pushl1 WINE_PACKED; /* 0x68 */
DWORD newret WINE_PACKED; /* ... */
BYTE pushl2 WINE_PACKED; /* 0x68 */
DWORD origfun WINE_PACKED; /* original function */
BYTE ret1 WINE_PACKED; /* 0xc3 */
WORD addesp WINE_PACKED; /* 0x83 0xc4 */
BYTE nrofargs WINE_PACKED; /* nr of arguments to add esp, */
BYTE pushl3 WINE_PACKED; /* 0x68 */
DWORD oldret WINE_PACKED; /* Filled out from popl above */
BYTE ret2 WINE_PACKED; /* 0xc3 */
} ELF_STDCALL_STUB;
#define UNIX_DLL_ENDING "so"
#define STUBSIZE 4095
#define STUBOFFSET (sizeof(IMAGE_DOS_HEADER) + \
sizeof(IMAGE_NT_HEADERS) + \
sizeof(IMAGE_SECTION_HEADER))
static FARPROC ELF_FindExportedFunction( WINE_MODREF *wm, LPCSTR funcName, int hint, BOOL snoop );
static HMODULE ELF_CreateDummyModule( LPCSTR libname, LPCSTR modname )
{
PIMAGE_DOS_HEADER dh;
PIMAGE_NT_HEADERS nth;
PIMAGE_SECTION_HEADER sh;
HMODULE hmod;
hmod = (HMODULE)HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
sizeof(IMAGE_DOS_HEADER) +
sizeof(IMAGE_NT_HEADERS) +
sizeof(IMAGE_SECTION_HEADER) + STUBSIZE );
dh = (PIMAGE_DOS_HEADER)hmod;
dh->e_magic = IMAGE_DOS_SIGNATURE;
dh->e_lfanew = sizeof(IMAGE_DOS_HEADER);
nth = (IMAGE_NT_HEADERS *)(dh + 1);
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 = STUBSIZE;
sh->VirtualAddress = STUBOFFSET; /* so snoop can use it ... */
sh->SizeOfRawData = STUBSIZE;
sh->PointerToRawData = 0;
sh->Characteristics = IMAGE_SCN_CNT_CODE|IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ;
return hmod;
}
WINE_MODREF *ELF_LoadLibraryExA( LPCSTR libname, DWORD flags)
{
WINE_MODREF *wm;
HMODULE hmod;
char *modname,*s,*t,*x;
LPVOID *dlhandle;
char error[256];
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 (!FILE_strcasecmp(s,".dll")) {
strcpy(s+1,UNIX_DLL_ENDING);
break;
}
s=strchr(s+1,'.');
}
} else {
strcat(x,"."UNIX_DLL_ENDING);
}
/* grab just the last piece of the path/filename
which should be the name of the library we are
looking to load. increment by 1 to skip the DOS slash */
s = strrchr(t,'\\');
s++;
/* ... and open the library pointed by s, while t points
points to the ENTIRE DOS filename of the library
t is returned by HeapAlloc() above and so is also used
with HeapFree() below */
dlhandle = wine_dlopen(s,RTLD_NOW,error,sizeof(error));
if (!dlhandle) {
WARN("failed to load %s: %s\n", s, error);
HeapFree( GetProcessHeap(), 0, t );
SetLastError( ERROR_FILE_NOT_FOUND );
return NULL;
}
hmod = ELF_CreateDummyModule( t, modname );
SNOOP_RegisterDLL(hmod,libname,0,STUBSIZE/sizeof(ELF_STDCALL_STUB));
wm = PE_CreateModule( hmod, libname, 0, 0, FALSE );
wm->find_export = ELF_FindExportedFunction;
wm->dlhandle = dlhandle;
return wm;
}
static FARPROC ELF_FindExportedFunction( WINE_MODREF *wm, LPCSTR funcName, int hint, BOOL snoop )
{
LPVOID fun;
int i,nrofargs = 0;
ELF_STDCALL_STUB *stub, *first_stub;
char error[256];
if (!HIWORD(funcName)) {
ERR("Can't import from UNIX dynamic libs by ordinal, sorry.\n");
return (FARPROC)0;
}
fun = wine_dlsym(wm->dlhandle,funcName,error,sizeof(error));
if (!fun)
{
/* we sometimes have an excess '_' at the beginning of the name */
if (funcName[0]=='_')
{
funcName++ ;
fun = wine_dlsym(wm->dlhandle,funcName,error,sizeof(error));
}
}
if (!fun) {
/* Function@nrofargs usually marks a stdcall function
* with nrofargs bytes that are popped at the end
*/
LPCSTR t;
if ((t = strchr(funcName,'@')))
{
LPSTR fn = HeapAlloc( GetProcessHeap(), 0, t - funcName + 1 );
memcpy( fn, funcName, t - funcName );
fn[t - funcName] = 0;
nrofargs = 0;
sscanf(t+1,"%d",&nrofargs);
fun = wine_dlsym(wm->dlhandle,fn,error,sizeof(error));
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.
*/
stub = first_stub = (ELF_STDCALL_STUB *)((char *)wm->module + STUBOFFSET);
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,error);
return fun;
}
fun = SNOOP_GetProcAddress(wm->module,funcName,stub-first_stub,fun);
return (FARPROC)fun;
}
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