mirror of
https://github.com/alliedmodders/amxmodx.git
synced 2024-12-26 14:55:36 +03:00
132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/**
|
|
* vim: set ts=4 :
|
|
* =============================================================================
|
|
* SourceMod
|
|
* Copyright (C) 2004-2010 AlliedModders LLC. All rights reserved.
|
|
* =============================================================================
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it under
|
|
* the terms of the GNU General Public License, version 3.0, as published by the
|
|
* Free Software Foundation.
|
|
*
|
|
* 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/>.
|
|
*
|
|
* As a special exception, AlliedModders LLC gives you permission to link the
|
|
* code of this program (as well as its derivative works) to "Half-Life 2," the
|
|
* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
|
|
* by the Valve Corporation. You must obey the GNU General Public License in
|
|
* all respects for all other code used. Additionally, AlliedModders LLC grants
|
|
* this exception to all derivative works. AlliedModders LLC defines further
|
|
* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
|
|
* or <http://www.sourcemod.net/license.php>.
|
|
*
|
|
* Version: $Id: detourhelpers.h 248 2008-08-27 00:56:22Z pred $
|
|
*/
|
|
|
|
#ifndef _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
|
|
#define _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
|
|
|
|
#if defined(__linux__) || defined(__APPLE__)
|
|
#include <sys/mman.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#ifndef PAGE_SIZE
|
|
#define PAGE_SIZE 4096
|
|
#endif
|
|
#define ALIGN(ar) ((long)ar & ~(PAGE_SIZE-1))
|
|
#define PAGE_EXECUTE_READWRITE PROT_READ|PROT_WRITE|PROT_EXEC
|
|
#if defined(__linux)
|
|
#include <malloc.h>
|
|
#endif
|
|
#elif defined(WIN32)
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
struct patch_t
|
|
{
|
|
patch_t()
|
|
{
|
|
patch[0] = 0;
|
|
bytes = 0;
|
|
}
|
|
unsigned char patch[20];
|
|
size_t bytes;
|
|
};
|
|
|
|
inline void ProtectMemory(void *addr, int length, int prot)
|
|
{
|
|
#if defined(__linux__) || defined(__APPLE__)
|
|
void *addr2 = (void *)ALIGN(addr);
|
|
mprotect(addr2, sysconf(_SC_PAGESIZE), prot);
|
|
#elif defined(WIN32)
|
|
DWORD old_prot;
|
|
VirtualProtect(addr, length, prot, &old_prot);
|
|
#endif
|
|
}
|
|
|
|
inline unsigned char *AllocatePageMemory(size_t size)
|
|
{
|
|
#if defined WIN32
|
|
return (unsigned char *)VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
|
|
#elif defined __GNUC__
|
|
#if defined __APPLE__
|
|
unsigned char *addr = (unsigned char *)valloc(size);
|
|
#else
|
|
unsigned char *addr = (unsigned char *)memalign(sysconf(_SC_PAGESIZE), size);
|
|
#endif
|
|
mprotect(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
|
|
return addr;
|
|
#endif
|
|
}
|
|
|
|
inline void FreePageMemory(void *addr)
|
|
{
|
|
#if defined(WIN32)
|
|
VirtualFree(addr, 0, MEM_RELEASE);
|
|
#else
|
|
free(addr);
|
|
#endif
|
|
}
|
|
|
|
inline void SetMemPatchable(void *address, size_t size)
|
|
{
|
|
ProtectMemory(address, (int)size, PAGE_EXECUTE_READWRITE);
|
|
}
|
|
|
|
inline void DoGatePatch(unsigned char *target, void *callback)
|
|
{
|
|
SetMemPatchable(target, 20);
|
|
|
|
target[0] = 0xFF; /* JMP */
|
|
target[1] = 0x25; /* MEM32 */
|
|
*(void **)(&target[2]) = callback;
|
|
}
|
|
|
|
inline void ApplyPatch(void *address, int offset, const patch_t *patch, patch_t *restore)
|
|
{
|
|
ProtectMemory(address, 20, PAGE_EXECUTE_READWRITE);
|
|
|
|
unsigned char *addr = (unsigned char *)address + offset;
|
|
if (restore)
|
|
{
|
|
for (size_t i=0; i<patch->bytes; i++)
|
|
{
|
|
restore->patch[i] = addr[i];
|
|
}
|
|
restore->bytes = patch->bytes;
|
|
}
|
|
|
|
for (size_t i=0; i<patch->bytes; i++)
|
|
{
|
|
addr[i] = patch->patch[i];
|
|
}
|
|
}
|
|
|
|
#endif //_INCLUDE_SOURCEMOD_DETOURHELPERS_H_
|