Implement a working CrashHandler::ExceptionHandler for Windows x64

2019-10-01 14:56:09 +08:00
parent 3cd1bdcc8f
commit ef4376cb6e
3 changed files with 62 additions and 2 deletions
@@ -0,0 +1,29 @@
+extrn ?MainExceptionHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z : PROC
+extrn VirtualAlloc : PROC
+
+.code
+
+; long __stdcall CrashHandler::ExceptionHandler( EXCEPTION_POINTERS *pExc );
+?ExceptionHandler@CrashHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z PROC
+
+push rbp
+mov rbp, rsp
+push rsi
+mov rsi, rcx
+xor rcx, rcx ; lpAddress = nullptr
+mov rdx, 8000h ; dwSize = iSize
+mov r8d, 00003000h; flAllocationType = MEM_COMMIT | MEM_RESERVE
+mov r9d, 04h ; flProtect = PAGE_READWRITE
+call VirtualAlloc ; char *pStack = (char *) VirtualAlloc( nullptr, iSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE );
+add rax, 8000h ; pStack += iSize;
+mov rcx, rsi ; Restore pExc
+pop rsi
+; mov rsp, rax ; FIXME: This instruction causes MainExceptionHandler abortion.
+call ?MainExceptionHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z
+mov rsp, rbp
+pop rbp
+ret
+
+?ExceptionHandler@CrashHandler@@YAJPEAU_EXCEPTION_POINTERS@@@Z ENDP
+
+END