67 lines · cpp
1//===------------------ sanitizer_unwind_fuchsia.cpp2//---------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9//10/// Sanitizer unwind Fuchsia specific functions.11//12//===----------------------------------------------------------------------===//13 14#include "sanitizer_platform.h"15#if SANITIZER_FUCHSIA16 17# include <limits.h>18# include <unwind.h>19 20# include "sanitizer_common.h"21# include "sanitizer_stacktrace.h"22 23namespace __sanitizer {24 25# if SANITIZER_CAN_SLOW_UNWIND26struct UnwindTraceArg {27 BufferedStackTrace *stack;28 u32 max_depth;29};30 31_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {32 UnwindTraceArg *arg = static_cast<UnwindTraceArg *>(param);33 CHECK_LT(arg->stack->size, arg->max_depth);34 uptr pc = _Unwind_GetIP(ctx);35 if (pc < GetPageSizeCached())36 return _URC_NORMAL_STOP;37 arg->stack->trace_buffer[arg->stack->size++] = pc;38 return (arg->stack->size == arg->max_depth ? _URC_NORMAL_STOP39 : _URC_NO_REASON);40}41 42void BufferedStackTrace::UnwindSlow(uptr pc, u32 max_depth) {43 CHECK_GE(max_depth, 2);44 size = 0;45 UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};46 _Unwind_Backtrace(Unwind_Trace, &arg);47 CHECK_GT(size, 0);48 // We need to pop a few frames so that pc is on top.49 uptr to_pop = LocatePcInTrace(pc);50 // trace_buffer[0] belongs to the current function so we always pop it,51 // unless there is only 1 frame in the stack trace (1 frame is always better52 // than 0!).53 PopStackFrames(Min(to_pop, static_cast<uptr>(1)));54 trace_buffer[0] = pc;55}56 57void BufferedStackTrace::UnwindSlow(uptr pc, void *context, u32 max_depth) {58 CHECK(context);59 CHECK_GE(max_depth, 2);60 UNREACHABLE("signal context doesn't exist");61}62# endif // SANITIZER_CAN_SLOW_UNWIND63 64} // namespace __sanitizer65 66#endif // SANITIZER_FUCHSIA67