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7.7 在实际上下文中谈CONTEXT结构
(1)线程CONTEXT记录线程的状态(如CPU各寄存器状态),以供下次调度时从停止处继续。
(2)CONTEXT的结构(要获得或设置时,必须在Context.ContextFlags设置相应的标志)
标志 |
说明 |
CONTEXT_CONTROL |
控制寄存器,如EIP、ESP,EBP等 |
CONTEXT_INTEGER |
整数寄存器,如EDI、ESI、EBX、EDX、ECX、EAX等 |
CONTEXT_FLOATING_POINT |
浮点寄存器,将寄存器结果返回到FLOATING_SAVE_AREA FloagSave |
CONTEXT_SEGMENTS |
段寄存器,如GS、FS、ES、DS |
CONTEXT_DEBUG_REGISTERS |
调试寄存器,如DR0、……、DR7 |
CONTEXT_EXTENDED_REGISTERS |
扩展寄存器,将寄存器的结果返回到 BYTE ExtendedRegisters[MAXIMUM_SUPPORTED_EXTENSION]数组中 |
★CONTEXT_FULL标志 = CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS
(3)获取和设置上下文
①先挂起线程和设置CONTEXT结构体相应的标志
②Get\SetThreadContext;
【ThreadContext程序】显示线程上下文的CPU寄存器状态
#include <windows.h> #include <tchar.h> #include <locale.h> //线程函数 DWORD WINAPI ThreadProc(PVOID pvParam) { HANDLE hEvent = (HANDLE)pvParam; WaitForSingleObject(hEvent, INFINITE); CloseHandle(hEvent); return 0; } int _tmain() { _tsetlocale(LC_ALL, _T("chs")); HANDLE hEvent = CreateEvent(NULL, FALSE, FALSE, NULL); HANDLE hEventDup = NULL; DuplicateHandle(GetCurrentProcess(), hEvent, GetCurrentProcess(), &hEventDup, DUPLICATE_SAME_ACCESS,FALSE,0); HANDLE hThread = CreateThread(NULL, 0, ThreadProc, hEventDup, CREATE_SUSPENDED,NULL); ResumeThread(hThread); SuspendThread(hThread); CONTEXT ct = {0}; ct.ContextFlags = CONTEXT_ALL; GetThreadContext(hThread, &ct); //显示CONTEXT的内容 _tprintf(_T("CPU寄存器状态:\n")); _tprintf(_T("\tEAX=0x%08X,EBX=0x%08X\n"),ct.Eax,ct.Ebx); _tprintf(_T("\tECX=0x%08X,EDX=0x%08X\n"), ct.Ecx, ct.Edx); _tprintf(_T("\tESI=0x%08X,EDI=0x%08X\n"), ct.Esi, ct.Edi); _tprintf(_T("\tEIP=0x%08X,ESP=0x%08X\n"), ct.Eip, ct.Esp); _tprintf(_T("\tEBP=0x%08X,EFL=0x%08X\n"), ct.Ebp, ct.EFlags); ResumeThread(hThread); SetEvent(hEvent); CloseHandle(hEvent); CloseHandle(hThread); _tsystem(_T("PAUSE")); return 0; }
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原文地址:http://www.cnblogs.com/5iedu/p/4712638.html