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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
24using namespace __sanitizer;
25
26#if !SANITIZER_GO
27void 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
50void 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# elif SANITIZER_MIPS32
79 int machine_type = IMAGE_FILE_MACHINE_R4000;
80 stack_frame.AddrPC.Offset = ctx.Fir;
81 stack_frame.AddrFrame.Offset = ctx.IntS8;
82 stack_frame.AddrStack.Offset = ctx.IntSp;
83# else
84 int machine_type = IMAGE_FILE_MACHINE_I386;
85 stack_frame.AddrPC.Offset = ctx.Eip;
86 stack_frame.AddrFrame.Offset = ctx.Ebp;
87 stack_frame.AddrStack.Offset = ctx.Esp;
88# endif
89# endif
90 stack_frame.AddrPC.Mode = AddrModeFlat;
91 stack_frame.AddrFrame.Mode = AddrModeFlat;
92 stack_frame.AddrStack.Mode = AddrModeFlat;
93 while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
94 &stack_frame, &ctx, NULL, SymFunctionTableAccess64,
95 SymGetModuleBase64, NULL) &&
96 size < Min(max_depth, kStackTraceMax)) {
97 trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
98 }
99}
100# ifdef __clang__
101# pragma clang diagnostic pop
102# endif
103# endif // #if !SANITIZER_GO
104
105#endif // SANITIZER_WINDOWS