1 //===-- sanitizer_unwind_win.cpp ------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 /// Sanitizer unwind Windows specific functions.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "sanitizer_platform.h"
14 #if SANITIZER_WINDOWS
15
16 #define WIN32_LEAN_AND_MEAN
17 #define NOGDI
18 #include <windows.h>
19
20 #include "sanitizer_dbghelp.h" // for StackWalk64
21 #include "sanitizer_stacktrace.h"
22 #include "sanitizer_symbolizer.h" // for InitializeDbgHelpIfNeeded
23
24 using namespace __sanitizer;
25
26 #if !SANITIZER_GO
UnwindSlow(uptr pc,u32 max_depth)27 void BufferedStackTrace::UnwindSlow(uptr pc, u32 max_depth) {
28 CHECK_GE(max_depth, 2);
29 // FIXME: CaptureStackBackTrace might be too slow for us.
30 // FIXME: Compare with StackWalk64.
31 // FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
32 size = CaptureStackBackTrace(1, Min(max_depth, kStackTraceMax),
33 (void **)&trace_buffer[0], 0);
34 if (size == 0)
35 return;
36
37 // Skip the RTL frames by searching for the PC in the stacktrace.
38 uptr pc_location = LocatePcInTrace(pc);
39 PopStackFrames(pc_location);
40
41 // Replace the first frame with the PC because the frame in the
42 // stacktrace might be incorrect.
43 trace_buffer[0] = pc;
44 }
45
UnwindSlow(uptr pc,void * context,u32 max_depth)46 void BufferedStackTrace::UnwindSlow(uptr pc, void *context, u32 max_depth) {
47 CHECK(context);
48 CHECK_GE(max_depth, 2);
49 CONTEXT ctx = *(CONTEXT *)context;
50 STACKFRAME64 stack_frame;
51 memset(&stack_frame, 0, sizeof(stack_frame));
52
53 InitializeDbgHelpIfNeeded();
54
55 size = 0;
56 #if defined(_WIN64)
57 int machine_type = IMAGE_FILE_MACHINE_AMD64;
58 stack_frame.AddrPC.Offset = ctx.Rip;
59 stack_frame.AddrFrame.Offset = ctx.Rbp;
60 stack_frame.AddrStack.Offset = ctx.Rsp;
61 #else
62 int machine_type = IMAGE_FILE_MACHINE_I386;
63 stack_frame.AddrPC.Offset = ctx.Eip;
64 stack_frame.AddrFrame.Offset = ctx.Ebp;
65 stack_frame.AddrStack.Offset = ctx.Esp;
66 #endif
67 stack_frame.AddrPC.Mode = AddrModeFlat;
68 stack_frame.AddrFrame.Mode = AddrModeFlat;
69 stack_frame.AddrStack.Mode = AddrModeFlat;
70 while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
71 &stack_frame, &ctx, NULL, SymFunctionTableAccess64,
72 SymGetModuleBase64, NULL) &&
73 size < Min(max_depth, kStackTraceMax)) {
74 trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
75 }
76 }
77 #endif // #if !SANITIZER_GO
78
79 #endif // SANITIZER_WINDOWS
80