mirror of
https://github.com/SerenityOS/serenity
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42 lines
1.2 KiB
C++
42 lines
1.2 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 <Kernel/API/kcov.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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// Note: This program requires serenity to be built with the CMake build option
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// ENABLE_KERNEL_COVERAGE_COLLECTION
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ErrorOr<int> serenity_main(Main::Arguments)
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{
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constexpr size_t num_entries = 1024 * 100;
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int fd = TRY(Core::System::open("/dev/kcov0"sv, O_RDWR));
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TRY(Core::System::ioctl(fd, KCOV_SETBUFSIZE, num_entries));
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kcov_pc_t* cover = (kcov_pc_t*)TRY(Core::System::mmap(NULL, num_entries * KCOV_ENTRY_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
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TRY(Core::System::ioctl(fd, KCOV_ENABLE));
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cover[0] = 0;
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// Example syscall so we actually cover some kernel code.
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getppid();
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TRY(Core::System::ioctl(fd, KCOV_DISABLE));
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u64 cov_idx = cover[0];
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for (size_t idx = 1; idx <= cov_idx; idx++)
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printf("%p\n", (void*)cover[idx]);
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TRY(Core::System::munmap(const_cast<u64*>(cover), num_entries * KCOV_ENTRY_SIZE));
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TRY(Core::System::close(fd));
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return 0;
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}
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