jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#pragma once
8
9#include <AK/Optional.h>
10#include <AK/OwnPtr.h>
11#include <Kernel/Arch/RegisterState.h>
12#include <Kernel/Forward.h>
13#include <LibC/sys/arch/regs.h>
14
15namespace Kernel {
16
17class ThreadTracer {
18public:
19 static ErrorOr<NonnullOwnPtr<ThreadTracer>> try_create(ProcessID tracer) { return adopt_nonnull_own_or_enomem(new (nothrow) ThreadTracer(tracer)); }
20
21 ProcessID tracer_pid() const { return m_tracer_pid; }
22 bool has_pending_signal(u32 signal) const { return (m_pending_signals & (1 << (signal - 1))) != 0; }
23 void set_signal(u32 signal) { m_pending_signals |= (1 << (signal - 1)); }
24 void unset_signal(u32 signal) { m_pending_signals &= ~(1 << (signal - 1)); }
25
26 bool is_tracing_syscalls() const { return m_trace_syscalls; }
27 void set_trace_syscalls(bool val) { m_trace_syscalls = val; }
28
29 void set_regs(RegisterState const& regs);
30 void set_regs(PtraceRegisters const& regs) { m_regs = regs; }
31 bool has_regs() const { return m_regs.has_value(); }
32 PtraceRegisters const& regs() const
33 {
34 VERIFY(m_regs.has_value());
35 return m_regs.value();
36 }
37
38private:
39 explicit ThreadTracer(ProcessID);
40
41 ProcessID m_tracer_pid { -1 };
42
43 // This is a bitmap for signals that are sent from the tracer to the tracee
44 // TODO: Since we do not currently support sending signals
45 // to the tracee via PT_CONTINUE, this bitmap is always zeroed
46 u32 m_pending_signals { 0 };
47
48 bool m_trace_syscalls { false };
49 Optional<PtraceRegisters> m_regs;
50};
51
52}