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mpv/loader/module.c

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/*
* Modules
*
* Copyright 1995 Alexandre Julliard
*/
#include <config.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
/*
#ifdef __linux__
#include <asm/unistd.h>
#include <asm/ldt.h>
#else
#define LDT_ENTRIES 8192
#define LDT_ENTRY_SIZE 8
struct modify_ldt_ldt_s {
unsigned int entry_number;
unsigned long base_addr;
unsigned int limit;
unsigned int seg_32bit:1;
unsigned int contents:2;
unsigned int read_exec_only:1;
unsigned int limit_in_pages:1;
unsigned int seg_not_present:1;
unsigned int useable:1;
};
#define MODIFY_LDT_CONTENTS_DATA 0
#define MODIFY_LDT_CONTENTS_STACK 1
#define MODIFY_LDT_CONTENTS_CODE 2
#define __NR_modify_ldt 123
#endif
*/
#include <wine/windef.h>
#include <wine/winerror.h>
#include <wine/heap.h>
#include <wine/module.h>
#include <wine/pe_image.h>
#include <wine/debugtools.h>
struct modref_list_t;
typedef struct modref_list_t
{
WINE_MODREF* wm;
struct modref_list_t *next;
struct modref_list_t *prev;
}
modref_list;
/***********************************************************************
* LDT_EntryToBytes
*
* Convert an ldt_entry structure to the raw bytes of the descriptor.
*/
/*static void LDT_EntryToBytes( unsigned long *buffer, const struct modify_ldt_ldt_s *content )
{
*buffer++ = ((content->base_addr & 0x0000ffff) << 16) |
(content->limit & 0x0ffff);
*buffer = (content->base_addr & 0xff000000) |
((content->base_addr & 0x00ff0000)>>16) |
(content->limit & 0xf0000) |
(content->contents << 10) |
((content->read_exec_only == 0) << 9) |
((content->seg_32bit != 0) << 22) |
((content->limit_in_pages != 0) << 23) |
0xf000;
}
*/
//
// funcs:
//
// 0 read LDT
// 1 write old mode
// 0x11 write
//
/*
static int modify_ldt( int func, struct modify_ldt_ldt_s *ptr,
unsigned long count )
{
int res;
#ifdef __PIC__
__asm__ __volatile__( "pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx"
: "=a" (res)
: "0" (__NR_modify_ldt),
"r" (func),
"c" (ptr),
"d" (sizeof(struct modify_ldt_ldt_s)*count) );
#else
__asm__ __volatile__("int $0x80"
: "=a" (res)
: "0" (__NR_modify_ldt),
"b" (func),
"c" (ptr),
"d" (sizeof(struct modify_ldt_ldt_s)*count) );
#endif
if (res >= 0) return res;
errno = -res;
return -1;
}
static int fs_installed=0;
static char* fs_seg=0;
static int install_fs()
{
struct modify_ldt_ldt_s array;
int fd;
int ret;
void* prev_struct;
if(fs_installed)
return 0;
fd=open("/dev/zero", O_RDWR);
fs_seg=mmap((void*)0xbf000000, 0x30000, PROT_READ | PROT_WRITE, MAP_PRIVATE,
fd, 0);
if(fs_seg==0)
{
printf("ERROR: Couldn't allocate memory for fs segment\n");
return -1;
}
array.base_addr=((int)fs_seg+0xffff) & 0xffff0000;
array.entry_number=0x1;
array.limit=array.base_addr+getpagesize()-1;
array.seg_32bit=1;
array.read_exec_only=0;
array.seg_not_present=0;
array.contents=MODIFY_LDT_CONTENTS_DATA;
array.limit_in_pages=0;
#ifdef linux
ret=modify_ldt(0x1, &array, 1);
if(ret<0)
{
perror("install_fs");
MESSAGE("Couldn't install fs segment, expect segfault\n");
}
#endif
#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
{
long d[2];
LDT_EntryToBytes( d, &array );
ret = i386_set_ldt(0x1, (union descriptor *)d, 1);
if (ret < 0)
{
perror("install_fs");
MESSAGE("Did you reconfigure the kernel with \"options USER_LDT\"?\n");
}
}
#endif
__asm__
(
"movl $0xf,%eax\n\t"
// "pushw %ax\n\t"
"movw %ax, %fs\n\t"
);
prev_struct=malloc(8);
*(void**)array.base_addr=prev_struct;
printf("prev_struct: 0x%X\n", prev_struct);
close(fd);
fs_installed=1;
return 0;
};
static int uninstall_fs()
{
printf("Uninstalling FS segment\n");
if(fs_seg==0)
return -1;
munmap(fs_seg, 0x30000);
fs_installed=0;
return 0;
}
*/
//WINE_MODREF *local_wm=NULL;
modref_list* local_wm=NULL;
WINE_MODREF *MODULE_FindModule(LPCSTR m)
{
modref_list* list=local_wm;
TRACE("Module %s request\n", m);
if(list==NULL)
return NULL;
while(strcmp(m, list->wm->filename))
{
// printf("%s: %x\n", list->wm->filename, list->wm->module);
list=list->prev;
if(list==NULL)
return NULL;
}
TRACE("Resolved to %s\n", list->wm->filename);
return list->wm;
}
void MODULE_RemoveFromList(WINE_MODREF *mod)
{
modref_list* list=local_wm;
if(list==0)
return;
if(mod==0)
return;
if((list->prev==NULL)&&(list->next==NULL))
{
free(list);
local_wm=NULL;
// uninstall_fs();
return;
}
for(;list;list=list->prev)
{
if(list->wm==mod)
{
if(list->prev)
list->prev->next=list->next;
if(list->next)
list->next->prev=list->prev;
if(list==local_wm)
local_wm=list->prev;
free(list);
return;
}
}
}
WINE_MODREF *MODULE32_LookupHMODULE(HMODULE m)
{
modref_list* list=local_wm;
TRACE("Module %X request\n", m);
if(list==NULL)
return NULL;
while(m!=list->wm->module)
{
// printf("Checking list %X wm %X module %X\n",
// list, list->wm, list->wm->module);
list=list->prev;
if(list==NULL)
return NULL;
}
TRACE("LookupHMODULE hit %X\n", list->wm);
return list->wm;
}
/*************************************************************************
* MODULE_InitDll
*/
static WIN_BOOL MODULE_InitDll( WINE_MODREF *wm, DWORD type, LPVOID lpReserved )
{
WIN_BOOL retv = TRUE;
static LPCSTR typeName[] = { "PROCESS_DETACH", "PROCESS_ATTACH",
"THREAD_ATTACH", "THREAD_DETACH" };
assert( wm );
/* Skip calls for modules loaded with special load flags */
if ( ( wm->flags & WINE_MODREF_DONT_RESOLVE_REFS )
|| ( wm->flags & WINE_MODREF_LOAD_AS_DATAFILE ) )
return TRUE;
TRACE("(%s,%s,%p) - CALL\n", wm->modname, typeName[type], lpReserved );
/* Call the initialization routine */
switch ( wm->type )
{
case MODULE32_PE:
retv = PE_InitDLL( wm, type, lpReserved );
break;
case MODULE32_ELF:
/* no need to do that, dlopen() already does */
break;
default:
ERR("wine_modref type %d not handled.\n", wm->type );
retv = FALSE;
break;
}
/* The state of the module list may have changed due to the call
to PE_InitDLL. We cannot assume that this module has not been
deleted. */
TRACE("(%p,%s,%p) - RETURN %d\n", wm, typeName[type], lpReserved, retv );
return retv;
}
/*************************************************************************
* MODULE_DllProcessAttach
*
* Send the process attach notification to all DLLs the given module
* depends on (recursively). This is somewhat complicated due to the fact that
*
* - we have to respect the module dependencies, i.e. modules implicitly
* referenced by another module have to be initialized before the module
* itself can be initialized
*
* - the initialization routine of a DLL can itself call LoadLibrary,
* thereby introducing a whole new set of dependencies (even involving
* the 'old' modules) at any time during the whole process
*
* (Note that this routine can be recursively entered not only directly
* from itself, but also via LoadLibrary from one of the called initialization
* routines.)
*
* Furthermore, we need to rearrange the main WINE_MODREF list to allow
* the process *detach* notifications to be sent in the correct order.
* This must not only take into account module dependencies, but also
* 'hidden' dependencies created by modules calling LoadLibrary in their
* attach notification routine.
*
* The strategy is rather simple: we move a WINE_MODREF to the head of the
* list after the attach notification has returned. This implies that the
* detach notifications are called in the reverse of the sequence the attach
* notifications *returned*.
*
* NOTE: Assumes that the process critical section is held!
*
*/
WIN_BOOL MODULE_DllProcessAttach( WINE_MODREF *wm, LPVOID lpReserved )
{
WIN_BOOL retv = TRUE;
int i;
assert( wm );
/* prevent infinite recursion in case of cyclical dependencies */
if ( ( wm->flags & WINE_MODREF_MARKER )
|| ( wm->flags & WINE_MODREF_PROCESS_ATTACHED ) )
return retv;
TRACE("(%s,%p) - START\n", wm->modname, lpReserved );
/* Tag current MODREF to prevent recursive loop */
wm->flags |= WINE_MODREF_MARKER;
/* Recursively attach all DLLs this one depends on */
/* for ( i = 0; retv && i < wm->nDeps; i++ )
if ( wm->deps[i] )
retv = MODULE_DllProcessAttach( wm->deps[i], lpReserved );
*/
/* Call DLL entry point */
//local_wm=wm;
if(local_wm)
{
local_wm->next=malloc(sizeof(modref_list));
local_wm->next->prev=local_wm;
local_wm->next->next=NULL;
local_wm->next->wm=wm;
local_wm=local_wm->next;
}
else
{
local_wm=malloc(sizeof(modref_list));
local_wm->next=local_wm->prev=NULL;
local_wm->wm=wm;
}
/* Remove recursion flag */
wm->flags &= ~WINE_MODREF_MARKER;
if ( retv )
{
retv = MODULE_InitDll( wm, DLL_PROCESS_ATTACH, lpReserved );
if ( retv )
wm->flags |= WINE_MODREF_PROCESS_ATTACHED;
}
TRACE("(%s,%p) - END\n", wm->modname, lpReserved );
return retv;
}
/*************************************************************************
* MODULE_DllProcessDetach
*
* Send DLL process detach notifications. See the comment about calling
* sequence at MODULE_DllProcessAttach. Unless the bForceDetach flag
* is set, only DLLs with zero refcount are notified.
*/
void MODULE_DllProcessDetach( WINE_MODREF* wm, WIN_BOOL bForceDetach, LPVOID lpReserved )
{
// WINE_MODREF *wm=local_wm;
wm->flags &= ~WINE_MODREF_PROCESS_ATTACHED;
MODULE_InitDll( wm, DLL_PROCESS_DETACH, lpReserved );
}
/***********************************************************************
* LoadLibraryExA (KERNEL32)
*/
HMODULE WINAPI LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
{
WINE_MODREF *wm;
if(!libname)
{
SetLastError(ERROR_INVALID_PARAMETER);
return 0;
}
// if(fs_installed==0)
// install_fs();
wm = MODULE_LoadLibraryExA( libname, hfile, flags );
if ( wm )
{
if ( !MODULE_DllProcessAttach( wm, NULL ) )
{
WARN_(module)("Attach failed for module '%s', \n", libname);
MODULE_FreeLibrary(wm);
SetLastError(ERROR_DLL_INIT_FAILED);
MODULE_RemoveFromList(wm);
wm = NULL;
}
}
return wm ? wm->module : 0;
}
/***********************************************************************
* MODULE_LoadLibraryExA (internal)
*
* Load a PE style module according to the load order.
*
* The HFILE parameter is not used and marked reserved in the SDK. I can
* only guess that it should force a file to be mapped, but I rather
* ignore the parameter because it would be extremely difficult to
* integrate this with different types of module represenations.
*
*/
WINE_MODREF *MODULE_LoadLibraryExA( LPCSTR libname, HFILE hfile, DWORD flags )
{
DWORD err = GetLastError();
WINE_MODREF *pwm;
int i;
// module_loadorder_t *plo;
SetLastError( ERROR_FILE_NOT_FOUND );
TRACE("Trying native dll '%s'\n", libname);
pwm = PE_LoadLibraryExA(libname, flags);
#ifdef HAVE_LIBDL
if(!pwm)
{
TRACE("Trying ELF dll '%s'\n", libname);
pwm=(WINE_MODREF*)ELFDLL_LoadLibraryExA(libname, flags);
}
#endif
// printf("0x%08x\n", pwm);
// break;
if(pwm)
{
/* Initialize DLL just loaded */
TRACE("Loaded module '%s' at 0x%08x, \n", libname, pwm->module);
/* Set the refCount here so that an attach failure will */
/* decrement the dependencies through the MODULE_FreeLibrary call. */
pwm->refCount++;
SetLastError( err ); /* restore last error */
return pwm;
}
WARN("Failed to load module '%s'; error=0x%08lx, \n", libname, GetLastError());
return NULL;
}
/***********************************************************************
* LoadLibraryA (KERNEL32)
*/
HMODULE WINAPI LoadLibraryA(LPCSTR libname) {
return LoadLibraryExA(libname,0,0);
}
/***********************************************************************
* FreeLibrary
*/
WIN_BOOL WINAPI FreeLibrary(HINSTANCE hLibModule)
{
WIN_BOOL retv = FALSE;
WINE_MODREF *wm;
wm=MODULE32_LookupHMODULE(hLibModule);
// wm=local_wm;
if ( !wm || !hLibModule )
{
SetLastError( ERROR_INVALID_HANDLE );
return 0;
}
else
retv = MODULE_FreeLibrary( wm );
MODULE_RemoveFromList(wm);
return retv;
}
/***********************************************************************
* MODULE_DecRefCount
*
* NOTE: Assumes that the process critical section is held!
*/
static void MODULE_DecRefCount( WINE_MODREF *wm )
{
int i;
if ( wm->flags & WINE_MODREF_MARKER )
return;
if ( wm->refCount <= 0 )
return;
--wm->refCount;
TRACE("(%s) refCount: %d\n", wm->modname, wm->refCount );
if ( wm->refCount == 0 )
{
wm->flags |= WINE_MODREF_MARKER;
for ( i = 0; i < wm->nDeps; i++ )
if ( wm->deps[i] )
MODULE_DecRefCount( wm->deps[i] );
wm->flags &= ~WINE_MODREF_MARKER;
}
}
/***********************************************************************
* MODULE_FreeLibrary
*
* NOTE: Assumes that the process critical section is held!
*/
WIN_BOOL MODULE_FreeLibrary( WINE_MODREF *wm )
{
TRACE("(%s) - START\n", wm->modname );
/* Recursively decrement reference counts */
//MODULE_DecRefCount( wm );
/* Call process detach notifications */
MODULE_DllProcessDetach( wm, FALSE, NULL );
PE_UnloadLibrary(wm);
TRACE("END\n");
return TRUE;
}
/***********************************************************************
* GetProcAddress (KERNEL32.257)
*/
FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
{
return MODULE_GetProcAddress( hModule, function, TRUE );
}
/***********************************************************************
* MODULE_GetProcAddress (internal)
*/
FARPROC MODULE_GetProcAddress(
HMODULE hModule, /* [in] current module handle */
LPCSTR function, /* [in] function to be looked up */
WIN_BOOL snoop )
{
WINE_MODREF *wm = MODULE32_LookupHMODULE( hModule );
// WINE_MODREF *wm=local_wm;
FARPROC retproc;
if (HIWORD(function))
TRACE_(win32)("(%08lx,%s)\n",(DWORD)hModule,function);
else
TRACE_(win32)("(%08lx,%p)\n",(DWORD)hModule,function);
if (!wm) {
SetLastError(ERROR_INVALID_HANDLE);
return (FARPROC)0;
}
switch (wm->type)
{
case MODULE32_PE:
retproc = PE_FindExportedFunction( wm, function, snoop );
if (!retproc) SetLastError(ERROR_PROC_NOT_FOUND);
return retproc;
#ifdef HAVE_LIBDL
case MODULE32_ELF:
retproc = (FARPROC) dlsym( wm->module, function);
if (!retproc) SetLastError(ERROR_PROC_NOT_FOUND);
return retproc;
#endif
default:
ERR("wine_modref type %d not handled.\n",wm->type);
SetLastError(ERROR_INVALID_HANDLE);
return (FARPROC)0;
}
}
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