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kcov-example: Port to LibMain

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Kenneth Myhra 2022-03-28 22:12:28 +02:00 committed by Brian Gianforcaro
parent 234025ee53
commit e302fac34b
Notes: sideshowbarker 2024-07-17 16:31:21 +09:00 
Author: https://github.com/kennethmyhra
Commit: https://github.com/SerenityOS/serenity/commit/e302fac34b
Pull-request: https://github.com/SerenityOS/serenity/pull/13341
Issue: https://github.com/SerenityOS/serenity/issues/11609
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
2 changed files with 13 additions and 30 deletions
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1
Userland/Utilities/CMakeLists.txt
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@ -124,6 +124,7 @@ target_link_libraries(install-bin LibMain)
target_link_libraries(jp LibMain)
target_link_libraries(js LibJS LibLine LibMain)
link_with_unicode_data(js)
target_link_libraries(kcov-example LibMain)
target_link_libraries(keymap LibKeyboard LibMain)
target_link_libraries(kill LibMain)
target_link_libraries(killall LibCore LibMain)

42
Userland/Utilities/kcov-example.cpp
View file

@ -4,6 +4,8 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
@ -14,47 +16,27 @@
// Note: This program requires serenity to be built with the CMake build option
// ENABLE_KERNEL_COVERAGE_COLLECTION
int main(void)
ErrorOr<int> serenity_main(Main::Arguments)
{
constexpr size_t num_entries = 1024 * 100;
int fd = open("/dev/kcov0", O_RDWR);
if (fd == -1) {
perror("open");
fprintf(stderr, "Could not open /dev/kcov0 - is ENABLE_KERNEL_COVERAGE_COLLECTION enabled?\n");
return 1;
}
if (ioctl(fd, KCOV_SETBUFSIZE, num_entries) == -1) {
perror("ioctl: KCOV_SETBUFSIZE");
return 1;
}
kcov_pc_t* cover = (kcov_pc_t*)mmap(NULL, num_entries * KCOV_ENTRY_SIZE,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (cover == MAP_FAILED) {
perror("mmap");
return 1;
}
if (ioctl(fd, KCOV_ENABLE) == -1) {
perror("ioctl: KCOV_ENABLE");
return 1;
}
int fd = TRY(Core::System::open("/dev/kcov0", O_RDWR));
TRY(Core::System::ioctl(fd, KCOV_SETBUFSIZE, num_entries));
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));
TRY(Core::System::ioctl(fd, KCOV_ENABLE));
cover[0] = 0;
// Example syscall so we actually cover some kernel code.
getppid();
if (ioctl(fd, KCOV_DISABLE) == -1) {
perror("ioctl: KCOV_DISABLE");
return 1;
}
TRY(Core::System::ioctl(fd, KCOV_DISABLE));
u64 cov_idx = cover[0];
for (size_t idx = 1; idx <= cov_idx; idx++)
printf("%p\n", (void*)cover[idx]);
if (munmap(const_cast<u64*>(cover), num_entries * KCOV_ENTRY_SIZE) == -1) {
perror("munmap");
return 1;
}
close(fd);
TRY(Core::System::munmap(const_cast<u64*>(cover), num_entries * KCOV_ENTRY_SIZE));
TRY(Core::System::close(fd));
return 0;
}