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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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namespace Kernel {
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// Note: These need to be kept in sync with Userland/Libraries/LibC/sys/kcov.h
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typedef volatile u64 kcov_pc_t;
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#define KCOV_ENTRY_SIZE sizeof(kcov_pc_t)
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#define KCOV_MAX_ENTRIES (10 * 1024 * 1024)
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/*
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* One KCOVInstance is allocated per process, when the process opens /dev/kcov
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* for the first time. At this point it is in state OPENED. When a thread in
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* the same process then uses the KCOV_ENABLE ioctl on the block device, the
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* instance enters state TRACING.
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*
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* A KCOVInstance in state TRACING can return to state OPENED by either the
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* KCOV_DISABLE ioctl or by killing the thread. A KCOVInstance in state OPENED
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* can return to state UNUSED only when the process dies. At this point
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* KCOVDevice::free_process will delete the KCOVInstance.
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*/
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class KCOVInstance final {
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public:
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explicit KCOVInstance(ProcessID pid);
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ErrorOr<void> buffer_allocate(size_t buffer_size_in_entries);
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bool has_buffer() const { return m_buffer != nullptr; }
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void buffer_add_pc(u64 pc);
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enum State {
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UNUSED = 0,
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OPENED = 1,
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TRACING = 2,
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} m_state { UNUSED };
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State state() const { return m_state; }
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void set_state(State state) { m_state = state; }
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Memory::VMObject* vmobject() { return m_vmobject; }
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Spinlock& spinlock() { return m_lock; }
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private:
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ProcessID m_pid { 0 };
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u64 m_buffer_size_in_entries { 0 };
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size_t m_buffer_size_in_bytes { 0 };
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kcov_pc_t* m_buffer { nullptr };
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RefPtr<Memory::AnonymousVMObject> m_vmobject;
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// Here to ensure it's not garbage collected at the end of open()
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OwnPtr<Memory::Region> m_kernel_region;
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Spinlock m_lock;
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};
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}
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