WiiUPluginSystem/loader/src/patcher/function_patcher.h

/****************************************************************************
 * Copyright (C) 2016-2018 Maschell
 * With code from chadderz and dimok
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/

#ifndef _FUNCTION_HOOKS_H_
#define _FUNCTION_HOOKS_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <dynamic_libs/os_functions.h>
#include <wups.h>

struct rpl_handling {
    wups_loader_library_type_t library;
    const char rplname[15];
    u32 handle;
};

#define FUNCTION_PATCHER_METHOD_STORE_SIZE  7

#define STATIC_FUNCTION          0
#define DYNAMIC_FUNCTION         1

#define FUNCTION_PATCHER_METHOD_STORE_SIZE                  7
#define MAXIMUM_MODULE_NAME_LENGTH                          51
#define MAXIMUM_FUNCTION_NAME_LENGTH                        51

struct replacement_data_function_t{
    u32 replaceAddr;                                                /* [needs to be filled] Address of our replacement function */
    u32 replaceCall;                                                /* [needs to be filled] Address to access the real_function */
    wups_loader_library_type_t library;                             /* [needs to be filled] rpl where the function we want to replace is. */
    char function_name[MAXIMUM_FUNCTION_NAME_LENGTH];               /* [needs to be filled] name of the function we want to replace */
    u32 realAddr;                                                   /* [will be filled] Address of the real function we want to replace. */
    volatile u32 replace_data [FUNCTION_PATCHER_METHOD_STORE_SIZE]; /* [will be filled] Space for us to store some jump instructions */
    u32 restoreInstruction;                                         /* [will be filled] Copy of the instruction we replaced to jump to our code. */
    u8 functionType;                                                /* [needs to be filled] name of the function we want to replace */
    u8 alreadyPatched;                                              /* [will be filled] */
    u32 entry_index;                                                /* [needs to be filled] name of the function we want to replace */

};

struct replacement_data_hook_t{
    void * func_pointer = NULL;                                     /* [will be filled] */
    wups_loader_hook_type_t type;                                   /* [will be filled] */
    u32 hook_index;                                                 /* [needs to be filled] name of the function we want to replace */

};

#define MAXIMUM_HOOKS_PER_MODULE                        4
#define MAXIMUM_FUNCTION_PER_MODULE                     100

struct replacement_data_module_t{
    char                        module_name[MAXIMUM_MODULE_NAME_LENGTH] = "";        // Name of this module
    int                         priority;                                       // Priority of this module
    int                         number_used_functions;                          // Number of used function. Maximum is MAXIMUM_FUNCTION_PER_MODULE
    replacement_data_function_t functions[MAXIMUM_FUNCTION_PER_MODULE];         // Replacement information for each function.

    int                         number_used_hooks;                              // Number of used hooks. Maximum is MAXIMUM_HOOKS_PER_MODULE
    replacement_data_hook_t     hooks[MAXIMUM_HOOKS_PER_MODULE];                 // Replacement information for each function.
};

#define MAXIMUM_MODULES                                 32

struct replacement_data_t{
    int                         number_used_modules = 0;                          // Number of used function. Maximum is MAXIMUM_FUNCTION_PER_MODULE
    replacement_data_module_t   module_data[MAXIMUM_MODULES];
};

void new_PatchInvidualMethodHooks(replacement_data_module_t * data);
void new_RestoreInvidualInstructions(replacement_data_module_t * module_data);
u32 new_GetAddressOfFunction(const char * functionName,wups_loader_library_type_t library);
s32 new_isDynamicFunction(u32 physicalAddress);
void new_resetLibs();

//Orignal code by Chadderz.
#define MAKE_MAGIC(x, lib,functionType) { (u32) my_ ## x, (u32) &real_ ## x, lib, # x,0,0,functionType,0}
#define MAKE_MAGIC_NAME(x,y, lib,functionType) { (u32) my_ ## x, (u32) &real_ ## x, lib, # y,0,0,functionType,0}

#ifdef __cplusplus
}
#endif

#endif /* _FS_H */