mirror of
https://github.com/alliedmodders/metamod-source.git
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73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
/* ======== SourceHook ========
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* Copyright (C) 2004-2005 Metamod:Source Development Team
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* No warranties of any kind
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*
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* License: zlib/libpng
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*
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* Author(s): Pavol "PM OnoTo" Marko, Scott "Damaged Soul" Ehlert
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* Contributors: lancevorgin, XAD, theqizmo
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* ============================
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*/
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#ifndef __SHINT_MEMORY_H__
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#define __SHINT_MEMORY_H__
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// Feb 17 / 2005:
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// Unprotect now sets to readwrite
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// The vtable doesn't need to be executable anyway
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# if /********/ defined _WIN32
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# include <windows.h>
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# define SH_MEM_READ 1
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# define SH_MEM_WRITE 2
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# define SH_MEM_EXEC 4
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# elif /******/ defined __linux__
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# include <sys/mman.h>
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// http://www.die.net/doc/linux/man/man2/mprotect.2.html
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# include <limits.h>
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# ifndef PAGESIZE
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# define PAGESIZE 4096
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# endif
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# define SH_MEM_READ PROT_READ
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# define SH_MEM_WRITE PROT_WRITE
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# define SH_MEM_EXEC PROT_EXEC
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// We need to align addr down to pagesize on linux
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// We assume PAGESIZE is a power of two
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# define SH_LALIGN(x) (void*)((intptr_t)(x) & ~(PAGESIZE-1))
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# define SH_LALDIF(x) ((intptr_t)(x) & (PAGESIZE-1))
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# else
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# error Unsupported OS/Compiler
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# endif
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namespace SourceHook
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{
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inline bool SetMemAccess(void *addr, size_t len, int access)
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{
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# ifdef __linux__
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return mprotect(SH_LALIGN(addr), len + SH_LALDIF(addr), access)==0 ? true : false;
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# else
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DWORD tmp;
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DWORD prot;
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switch (access)
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{
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case SH_MEM_READ:
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prot = PAGE_READONLY; break;
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case SH_MEM_READ | SH_MEM_WRITE:
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prot = PAGE_READWRITE; break;
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case SH_MEM_READ | SH_MEM_EXEC:
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prot = PAGE_EXECUTE_READ; break;
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default:
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case SH_MEM_READ | SH_MEM_WRITE | SH_MEM_EXEC:
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prot = PAGE_EXECUTE_READWRITE; break;
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}
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return VirtualProtect(addr, len, prot, &tmp) ? true : false;
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# endif
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}
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}
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#endif
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