mirror of
https://github.com/alliedmodders/amxmodx.git
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101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
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#include "MemConst.h"
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// Game memory addresses
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maddress gameDllAddress;
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maddress gameEngAddress;
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bool GetBaseAddress(void *pAddr, maddress &pBaseAddr)
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{
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#ifdef WIN32
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MEMORY_BASIC_INFORMATION mem;
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if (!VirtualQuery(pAddr, &mem, sizeof(mem)))
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return false;
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if (pBaseAddr)
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pBaseAddr = (maddress)mem.AllocationBase;
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IMAGE_DOS_HEADER *dos = (IMAGE_DOS_HEADER *)(mem.AllocationBase);
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IMAGE_NT_HEADERS *pe = reinterpret_cast<IMAGE_NT_HEADERS *>((unsigned long)dos + (unsigned long)dos->e_lfanew);
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if (pe->Signature != IMAGE_NT_SIGNATURE)
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return false;
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return true;
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#else
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Dl_info info;
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struct stat buf;
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if (!dladdr(pAddr, &info))
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return false;
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if (!info.dli_fbase || !info.dli_fname)
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return false;
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if (stat(info.dli_fname, &buf) != 0)
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return false;
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if (pBaseAddr)
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pBaseAddr = (maddress)info.dli_fbase;
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if (memLength)
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*memLength = buf.st_size;
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return true;
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#endif
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}
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/* Wrapper for mprotect and VirtualProtect */
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int MemoryProtect(void *addr, size_t len, unsigned long newProt, unsigned long *oldProt, char memType) {
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int retVal;
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#ifdef __linux__
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maddress alignAddr = (maddress)addr - ((maddress)addr % pageSize);
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retVal = mprotect((void*)alignAddr, pageSize, newProt);
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// Linux's mprotect doesn't get the old protection flags, so we have to fake it
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switch (memType) {
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case MEMTYPE_CODE:
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*oldProt = MPROT_CODE;
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break;
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case MEMTYPE_RODATA:
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*oldProt = MPROT_RODATA;
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break;
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default:
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*oldProt = MPROT_CODE;
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break;
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}
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#else
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retVal = VirtualProtect(addr, len, newProt, oldProt);
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// This will match the Windows return value with the Linux ones, done for consistency
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if (retVal == 0) {
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retVal = -1;
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} else {
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retVal = 0;
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}
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#endif
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return retVal;
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}
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/* Gets real memory address */
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maddress GetRealMemoryAddress(maddress baseaddress, maddress address, char memType)
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{
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if(baseaddress == NULL) return address;
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maddress realAddress = address;
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switch (memType)
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{
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case MEMTYPE_CODE: case MEMTYPE_RODATA:
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realAddress = baseaddress + address;
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break;
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case MEMTYPE_DATA:
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// Linux's data segment is in a not so simple place in memory
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#ifdef __linux__
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realAddress = dataSectionStart + (address - dataSectionOffset);
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#else
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realAddress = baseaddress + address;
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#endif
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break;
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}
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return realAddress;
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}
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