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4bfd6e41b9
This makes for nicer handling of errors compared to checking whether a RefPtr is null. Additionally, this will give way to return different types of errors in the future.
63 lines
1.8 KiB
C++
63 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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#include <AK/String.h>
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#include <Kernel/Devices/KCOVInstance.h>
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namespace Kernel {
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KCOVInstance::KCOVInstance(ProcessID pid)
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{
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m_pid = pid;
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state = UNUSED;
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}
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KResult KCOVInstance::buffer_allocate(size_t buffer_size_in_entries)
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{
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if (buffer_size_in_entries < 2 || buffer_size_in_entries > KCOV_MAX_ENTRIES)
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return EINVAL;
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// first entry contains index of last PC
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this->m_buffer_size_in_entries = buffer_size_in_entries - 1;
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this->m_buffer_size_in_bytes = Memory::page_round_up(buffer_size_in_entries * KCOV_ENTRY_SIZE);
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// one single vmobject is representing the buffer
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// - we allocate one kernel region using that vmobject
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// - when an mmap call comes in, we allocate another userspace region,
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// backed by the same vmobject
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auto maybe_vmobject = Memory::AnonymousVMObject::try_create_with_size(
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this->m_buffer_size_in_bytes, AllocationStrategy::AllocateNow);
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if (maybe_vmobject.is_error())
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return maybe_vmobject.error();
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this->vmobject = maybe_vmobject.release_value();
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this->m_kernel_region = MM.allocate_kernel_region_with_vmobject(
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*this->vmobject, this->m_buffer_size_in_bytes, String::formatted("kcov_{}", this->m_pid),
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Memory::Region::Access::ReadWrite);
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if (!this->m_kernel_region)
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return ENOMEM;
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this->m_buffer = (u64*)this->m_kernel_region->vaddr().as_ptr();
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if (!this->has_buffer())
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return ENOMEM;
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return KSuccess;
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}
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void KCOVInstance::buffer_add_pc(u64 pc)
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{
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auto idx = (u64)this->m_buffer[0];
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if (idx >= this->m_buffer_size_in_entries) {
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// the buffer is already full
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return;
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}
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this->m_buffer[idx + 1] = pc;
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this->m_buffer[0] = idx + 1;
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}
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}
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