mach_error_t
mach_override(
char *originalFunctionSymbolName,
const char *originalFunctionLibraryNameHint,
const void *overrideFunctionAddress,
void **originalFunctionReentryIsland )
{
assert( originalFunctionSymbolName );
assert( strlen( originalFunctionSymbolName ) );
assert( overrideFunctionAddress );
// Lookup the original function's code pointer.
long *originalFunctionPtr;
if( originalFunctionLibraryNameHint )
_dyld_lookup_and_bind_with_hint(
originalFunctionSymbolName,
originalFunctionLibraryNameHint,
(void*) &originalFunctionPtr,
NULL );
else
_dyld_lookup_and_bind(
originalFunctionSymbolName,
(void*) &originalFunctionPtr,
NULL );
//printf ("In mach_override\n");
return mach_override_ptr( originalFunctionPtr, overrideFunctionAddress,
originalFunctionReentryIsland );
}
/* A function called through the vtable to get the address of
a symbol loaded from a particular module. */
static void *
vm_sym (lt_user_data loader_data, lt_module module, const char *name)
{
NSSymbol *nssym = 0;
const mach_header *mh = (const mach_header *) module;
char saveError[256] = "Symbol not found";
if (module == (lt_module) -1)
{
void *address, *unused;
_dyld_lookup_and_bind (name, (unsigned long*) &address, &unused);
return address;
}
if (mh->magic == LT__MAGIC)
{
if (lt__image_symbol_p && lt__image_symbol)
{
if (lt__image_symbol_p (mh, name))
{
nssym = lt__image_symbol (mh, name, LT__SYMLOOKUP_OPTS);
}
}
}
else
{
nssym = NSLookupSymbolInModule (module, name);
}
if (!nssym)
{
strncpy (saveError, dylderror (LT__STRERROR (SYMBOL_NOT_FOUND)), 255);
saveError[255] = 0;
if (!mh)
{
mh = (mach_header *)lt__nsmodule_get_header (module);
}
nssym = lt__linkedlib_symbol (name, mh);
}
if (!nssym)
{
LT__SETERRORSTR (saveError);
}
return nssym ? NSAddressOfSymbol (nssym) : 0;
}
void *
bin_find_symbol(char *sym, size_t *size) {
void *ptr = NULL;
_dyld_lookup_and_bind((const char*)sym, &ptr, NULL);
return ptr;
}
