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- /*----------------------------------------------------------------------------*\
- ===========================
- Y Sever Includes - Writemem
- ===========================
- Description:
- Write to any absolute address in the SA:MP server in pure PAWN with embedded
- assembly (i.e. a new native). Calls "VirtualProtect" to make writes safe.
- Legal:
- Version: MPL 1.1
- The contents of this file are subject to the Mozilla Public License Version
- 1.1 (the "License"); you may not use this file except in compliance with
- the License. You may obtain a copy of the License at
- http://www.mozilla.org/MPL/
- Software distributed under the License is distributed on an "AS IS" basis,
- WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- for the specific language governing rights and limitations under the
- License.
- The Original Code is the YSI ini include.
- The Initial Developer of the Original Code is Alex "Y_Less" Cole.
- Portions created by the Initial Developer are Copyright (C) 2011
- the Initial Developer. All Rights Reserved.
- Contributors:
- ZeeX, koolk, JoeBullet/Google63, g_aSlice/Slice
- Thanks:
- JoeBullet/Google63 - Handy arbitrary ASM jump code using SCTRL.
- ZeeX - Very productive conversations.
- koolk - IsPlayerinAreaEx code.
- TheAlpha - Danish translation.
- breadfish - German translation.
- Fireburn - Dutch translation.
- yom - French translation.
- 50p - Polish translation.
- Zamaroht - Spanish translation.
- Dracoblue, sintax, mabako, Xtreme, other coders - Producing other modes
- for me to strive to better.
- Pixels^ - Running XScripters where the idea was born.
- Matite - Pestering me to release it and using it.
- Very special thanks to:
- Thiadmer - PAWN, whose limits continue to amaze me!
- Kye/Kalcor - SA:MP.
- SA:MP Team past, present and future - SA:MP.
- Version:
- 1.0
- Changelog:
- 01/02/12:
- Added "VirtualProtect" calls to the code.
- First version.
- Functions:
- Public:
- -
- Core:
- -
- Stock:
- -
- Static:
- -
- Inline:
- -
- API:
- WriteMem - Write data to an address.
- Callbacks:
- -
- Definitions:
- asm - Convert a stream of assembly to a cell.
- Enums:
- -
- Macros:
- -
- Tags:
- -
- Variables:
- Global:
- -
- Static:
- YSI_g_sWriteMem - The assembly.
- Commands:
- -
- Compile options:
- -
- Operators:
- -
- \*----------------------------------------------------------------------------*/
- #include <a_samp>
- #include <YSI\y_amx>
- #include <YSI\y_hooks>
- #include <YSI\y_utils>
- forward WriteMem(addr, value);
- #define asm(%0,%1,%2,%3) ((0x%0<<0)|(0x%1<<8)|(0x%2<<16)|(0x%3<<24))
- /*
- cell AMX_NATIVE_CALL
- n_WriteMem(AMX * amx, cell * params)
- {
- if (params[0] == 8)
- {
- DWORD
- oldp;
- VirtualProtect((cell *)params[1], 4, PAGE_EXECUTE_READWRITE, &oldp);
- *((cell *)params[1]) = params[2];
- }
- return 0;
- }
- BECOMES:
- align 16
- push ebp
- mov ebp, esp
- push esi
- mov esi, [ebp+12]
- cmp dword ptr [esi], 8
- jnz short loc_ret
- mov ecx, [esi+4]
- lea eax, [ebp+12]
- push eax
- push 40h
- push 4
- push ecx
- call ds:__imp__VirtualProtect@16
- mov edx, [esi+4]
- mov eax, [esi+8]
- mov [edx], eax
- loc_ret:
- xor eax, eax
- pop esi
- pop ebp
- retn
- BECOMES:
- */
- static
- YSI_g_sWriteMem[] =
- {
- asm(CC,CC,CC,CC), asm(CC,CC,CC,CC), asm(CC,CC,CC,CC), asm(CC,CC,CC,CC),
- asm(55,8B,EC,56), asm(8B,75,0C,83), asm(3E,08,75,1A), asm(8B,4E,04,8D),
- asm(45,0C,50,6A), asm(40,6A,04,51), asm(FF,15,3C,70), asm(00,10,8B,56),
- asm(04,8B,46,08), asm(89,02,33,C0), asm(5E,5D,C3,CC)
- };
- static
- YSI_g_sDoWriteMem[] =
- {
- 135, // sysreq.d opcode
- 0, // will be set later
- };
- stock
- WriteMem(addr, value)
- {
- // Push addr and value.
- #emit PUSH.S value
- #emit PUSH.S addr
- #emit PUSH.C 8
- // Get the jump address.
- #emit CONST.PRI YSI_g_sDoWriteMem
- #emit LOAD.ALT AMX_HEADER_DAT
- #emit ADD
- #emit LOAD.ALT AMX_HEADER_COD
- #emit SUB
- // Jump to the code stored in YSI_g_sDoWriteMem.
- // This will result in execution of the native code stored in YSI_g_sWriteMem.
- #emit JUMP.PRI
- // Pop native arguments.
- #emit STACK 12
- }
- static
- WM_Shift(from, to, data[], len = sizeof (data))
- {
- if (FALSE)
- {
- WriteMem(0, 0);
- }
- while (from < len)
- {
- data[to++] = data[from++];
- }
- }
- hook OnScriptInit()
- {
- new
- addr = AMX_GetGlobalAddress(YSI_g_sWriteMem);
- // Align the code to a 16-byte boundary.
- switch (addr & 15)
- {
- case 0:
- {
- WM_Shift(4, 0, YSI_g_sWriteMem);
- }
- case 4:
- {
- WM_Shift(4, 3, YSI_g_sWriteMem);
- addr += 12;
- }
- case 8:
- {
- WM_Shift(4, 2, YSI_g_sWriteMem);
- addr += 8;
- }
- case 12:
- {
- WM_Shift(4, 1, YSI_g_sWriteMem);
- addr += 4;
- }
- default:
- {
- P:E("Cannot relocate YSI_g_sWriteMem");
- }
- }
- YSI_g_sDoWriteMem[1] = addr;
- return 1;
- }
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