get_syscall
EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
EXPECT_EQ(__NR_openat, get_syscall(_metadata, tracee));
EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
self->syscall_nr = get_syscall(_metadata, tracee);
ret = get_syscall(_metadata, child_pid);
ret = get_syscall(_metadata, child_pid);
syscall_addr = get_syscall(envp);