mhook can't hook _loop ;)

mhook.txt

@@ -0,0 +1,31 @@
+_loop original:
+00007FFF7CAE978C | 48 89 C8                 | mov rax,rcx                             |
+00007FFF7CAE978F | 48 F7 E1                 | mul rcx                                 |
+00007FFF7CAE9792 | 90                       | nop                                     |
+00007FFF7CAE9793 | 90                       | nop                                     |
+00007FFF7CAE9794 | 90                       | nop                                     |
+00007FFF7CAE9795 | E2 F8                    | loop test_cases.7FFF7CAE978F            |
+00007FFF7CAE9797 | C3                       | ret                                     |
+
+_loop hooked:
+00007FFF7CAE978C | E9 0F 69 23 00           | jmp <MHook_Hooks::hookLoop>             |
+00007FFF7CAE9791 | E1 90                    | loope test_cases.7FFF7CAE9723           |
+00007FFF7CAE9793 | 90                       | nop                                     |
+00007FFF7CAE9794 | 90                       | nop                                     |
+00007FFF7CAE9795 | E2 F8                    | loop test_cases.7FFF7CAE978F            |
+00007FFF7CAE9797 | C3                       | ret                                     |
+
+trampoline:
+00007FFF7CD200C0 | 48 89 C8                 | mov rax,rcx                             |
+00007FFF7CD200C3 | 48 F7 E1                 | mul rcx                                 |
+00007FFF7CD200C6 | E9 C7 96 DC FF           | jmp test_cases.7FFF7CAE9792             |
+
+then executes:
+00007FFF7CAE9792 | 90                       | nop                                     |
+00007FFF7CAE9793 | 90                       | nop                                     |
+00007FFF7CAE9794 | 90                       | nop                                     |
+00007FFF7CAE9795 | E2 F8                    | loop test_cases.7FFF7CAE978F            |
+
+But that jumps back into the middle of the jump and thus executes:
+00007FFF7CAE978F | 23 00                    | and eax,dword ptr ds:[rax]              |
+00007FFF7CAE9791 | E1 90                    | loope test_cases.7FFF7CAE9723           |

tester/mhook.cpp

@@ -69,7 +69,7 @@ bool MHook::hook_all(void) {
 	ret |= Mhook_SetHook((PVOID*)&trueAVX, &MHook_Hooks::hookAVX);
 	ret |= Mhook_SetHook((PVOID*)&trueRDRAND, &MHook_Hooks::hookRDRAND);
 
-	ret |= Mhook_SetHook((PVOID*)&trueLoop, &MHook_Hooks::hookLoop);
+	//ret |= Mhook_SetHook((PVOID*)&trueLoop, &MHook_Hooks::hookLoop);
 	ret |= Mhook_SetHook((PVOID*)&trueTailRecursion, &MHook_Hooks::hookTail_recursion);
 
 	return ret;
@@ -80,6 +80,6 @@ bool MHook::unhook_all() {
 		Mhook_Unhook((PVOID*)&trueBranch) &&
 		Mhook_Unhook((PVOID*)&trueAVX) &&
 		Mhook_Unhook((PVOID*)&trueRDRAND) &&
-		Mhook_Unhook((PVOID*)&trueLoop) &&
+		//Mhook_Unhook((PVOID*)&trueLoop) &&
 		Mhook_Unhook((PVOID*)&trueTailRecursion);
 }