You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.8 KiB
57 lines
1.8 KiB
//===-- SingleStepCheck.h ------------------------------------- -*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef liblldb_SingleStepCheck_H_
|
|
#define liblldb_SingleStepCheck_H_
|
|
|
|
#include <memory>
|
|
#include <sched.h>
|
|
#include <sys/types.h>
|
|
|
|
namespace lldb_private {
|
|
namespace process_linux {
|
|
|
|
// arm64 linux had a bug which prevented single-stepping and watchpoints from
|
|
// working on non-boot cpus, due to them being incorrectly initialized after
|
|
// coming out of suspend. This issue is particularly affecting android M, which
|
|
// uses suspend ("doze mode") quite aggressively. This code detects that
|
|
// situation and makes single-stepping work by doing all the step operations on
|
|
// the boot cpu.
|
|
//
|
|
// The underlying issue has been fixed in android N and linux 4.4. This code can
|
|
// be removed once these systems become obsolete.
|
|
|
|
#if defined(__arm64__) || defined(__aarch64__)
|
|
class SingleStepWorkaround {
|
|
::pid_t m_tid;
|
|
cpu_set_t m_original_set;
|
|
|
|
SingleStepWorkaround(const SingleStepWorkaround &) = delete;
|
|
void operator=(const SingleStepWorkaround &) = delete;
|
|
|
|
public:
|
|
SingleStepWorkaround(::pid_t tid, cpu_set_t original_set)
|
|
: m_tid(tid), m_original_set(original_set) {}
|
|
~SingleStepWorkaround();
|
|
|
|
static std::unique_ptr<SingleStepWorkaround> Get(::pid_t tid);
|
|
};
|
|
#else
|
|
class SingleStepWorkaround {
|
|
public:
|
|
static std::unique_ptr<SingleStepWorkaround> Get(::pid_t tid) {
|
|
return nullptr;
|
|
}
|
|
};
|
|
#endif
|
|
|
|
} // end namespace process_linux
|
|
} // end namespace lldb_private
|
|
|
|
#endif // #ifndef liblldb_SingleStepCheck_H_
|