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