5 typedef unsigned char UBYTE;
7 const UBYTE UNW_FLAG_EHANDLER = 0x1;
14 UBYTE FrameRegister : 4;
15 UBYTE FrameOffset : 4;
16 ULONG ExceptionHandler;
17 ULONG ExceptionData[1];
21 UNWIND_INFO unwind_info;
22 RUNTIME_FUNCTION func;
26 void factor_vm::c_to_factor_toplevel(cell quot) {
27 /* The annoying thing about Win64 SEH is that the offsets in
28 * function tables are 32-bit integers, and the exception handler
29 * itself must reside between the start and end pointers, so
30 * we stick everything at the beginning of the code heap and
31 * generate a small trampoline that jumps to the real
32 * exception handler. */
34 seh_data* seh_area = (seh_data*)code->seh_area;
35 cell base = code->seg->start;
37 /* Should look at generating this with the Factor assembler */
40 seh_area->handler[0] = 0x48;
41 seh_area->handler[1] = 0xb8;
42 seh_area->handler[2] = 0x0;
43 seh_area->handler[3] = 0x0;
44 seh_area->handler[4] = 0x0;
45 seh_area->handler[5] = 0x0;
46 seh_area->handler[6] = 0x0;
47 seh_area->handler[7] = 0x0;
48 seh_area->handler[8] = 0x0;
49 seh_area->handler[9] = 0x0;
52 seh_area->handler[10] = 0x48;
53 seh_area->handler[11] = 0xff;
54 seh_area->handler[12] = 0xe0;
56 /* Store address of exception handler in the operand of the 'mov' */
57 cell handler = (cell) & factor::exception_handler;
58 memcpy(&seh_area->handler[2], &handler, sizeof(cell));
60 UNWIND_INFO* unwind_info = &seh_area->unwind_info;
61 unwind_info->Version = 1;
62 unwind_info->Flags = UNW_FLAG_EHANDLER;
63 unwind_info->SizeOfProlog = 0;
64 unwind_info->CountOfCodes = 0;
65 unwind_info->FrameRegister = 0;
66 unwind_info->FrameOffset = 0;
67 unwind_info->ExceptionHandler = (DWORD)((cell) & seh_area->handler[0] - base);
68 unwind_info->ExceptionData[0] = 0;
70 RUNTIME_FUNCTION* func = &seh_area->func;
71 func->BeginAddress = 0;
72 func->EndAddress = (DWORD)(code->seg->end - base);
73 func->UnwindData = (DWORD)((cell) & seh_area->unwind_info - base);
75 if (!RtlAddFunctionTable(func, 1, base))
76 fatal_error("RtlAddFunctionTable() failed", 0);
80 if (!RtlDeleteFunctionTable(func))
81 fatal_error("RtlDeleteFunctionTable() failed", 0);