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
46 #ifdef __clang__
47 #pragma clang diagnostic push
48 #pragma clang diagnostic ignored "-Wframe-larger-than="
49 #endif
UnwindSlow(uptr pc,void * context,u32 max_depth)50 void BufferedStackTrace::UnwindSlow(uptr pc, void *context, u32 max_depth) {
51 CHECK(context);
52 CHECK_GE(max_depth, 2);
53 CONTEXT ctx = *(CONTEXT *)context;
54 STACKFRAME64 stack_frame;
55 memset(&stack_frame, 0, sizeof(stack_frame));
56
57 InitializeDbgHelpIfNeeded();
58
59 size = 0;
60 # if SANITIZER_WINDOWS64
61 # if SANITIZER_ARM64
62 int machine_type = IMAGE_FILE_MACHINE_ARM64;
63 stack_frame.AddrPC.Offset = ctx.Pc;
64 stack_frame.AddrFrame.Offset = ctx.Fp;
65 stack_frame.AddrStack.Offset = ctx.Sp;
66 # else
67 int machine_type = IMAGE_FILE_MACHINE_AMD64;
68 stack_frame.AddrPC.Offset = ctx.Rip;
69 stack_frame.AddrFrame.Offset = ctx.Rbp;
70 stack_frame.AddrStack.Offset = ctx.Rsp;
71 # endif
72 # else
73 # if SANITIZER_ARM
74 int machine_type = IMAGE_FILE_MACHINE_ARM;
75 stack_frame.AddrPC.Offset = ctx.Pc;
76 stack_frame.AddrFrame.Offset = ctx.R11;
77 stack_frame.AddrStack.Offset = ctx.Sp;
78 # else
79 int machine_type = IMAGE_FILE_MACHINE_I386;
80 stack_frame.AddrPC.Offset = ctx.Eip;
81 stack_frame.AddrFrame.Offset = ctx.Ebp;
82 stack_frame.AddrStack.Offset = ctx.Esp;
83 # endif
84 # endif
85 stack_frame.AddrPC.Mode = AddrModeFlat;
86 stack_frame.AddrFrame.Mode = AddrModeFlat;
87 stack_frame.AddrStack.Mode = AddrModeFlat;
88 while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
89 &stack_frame, &ctx, NULL, SymFunctionTableAccess64,
90 SymGetModuleBase64, NULL) &&
91 size < Min(max_depth, kStackTraceMax)) {
92 trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
93 }
94 }
95 # ifdef __clang__
96 # pragma clang diagnostic pop
97 # endif
98 # endif // #if !SANITIZER_GO
99
100 #endif // SANITIZER_WINDOWS
101