With just this commit we get to support all syscalls via hooking
raw_syscalls:sys_{enter,exit} to the trace__sys_{enter,exit} routines
to combine, strace-like, those tracepoints.

  # trace -e tools/perf/examples/bpf/augmented_raw_syscalls.c sleep 1
         ? (         ): sleep/31680  ... [continued]: execve()) = 0
     0.043 ( 0.004 ms): sleep/31680 brk() = 0x55652a851000
     0.070 ( 0.009 ms): sleep/31680 access(filename:, mode: R) = -1 ENOENT No such file or directory
     0.087 ( 0.006 ms): sleep/31680 openat(dfd: CWD, filename: , flags: CLOEXEC) = 3
     0.096 ( 0.003 ms): sleep/31680 fstat(fd: 3, statbuf: 0x7ffc5269e190) = 0
     0.101 ( 0.005 ms): sleep/31680 mmap(len: 103334, prot: READ, flags: PRIVATE, fd: 3) = 0x7f709c239000
     0.109 ( 0.002 ms): sleep/31680 close(fd: 3) = 0
     0.126 ( 0.006 ms): sleep/31680 openat(dfd: CWD, filename: , flags: CLOEXEC) = 3
     0.135 ( 0.003 ms): sleep/31680 read(fd: 3, buf: 0x7ffc5269e358, count: 832) = 832
     0.141 ( 0.002 ms): sleep/31680 fstat(fd: 3, statbuf: 0x7ffc5269e1f0) = 0
     0.146 ( 0.005 ms): sleep/31680 mmap(len: 8192, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS) = 0x7f709c237000
     0.159 ( 0.007 ms): sleep/31680 mmap(len: 3889792, prot: EXEC|READ, flags: PRIVATE|DENYWRITE, fd: 3) = 0x7f709bc79000
     0.168 ( 0.009 ms): sleep/31680 mprotect(start: 0x7f709be26000, len: 2093056) = 0
     0.179 ( 0.010 ms): sleep/31680 mmap(addr: 0x7f709c025000, len: 24576, prot: READ|WRITE, flags: PRIVATE|FIXED|DENYWRITE, fd: 3, off: 1753088) = 0x7f709c025000
     0.196 ( 0.005 ms): sleep/31680 mmap(addr: 0x7f709c02b000, len: 14976, prot: READ|WRITE, flags: PRIVATE|FIXED|ANONYMOUS) = 0x7f709c02b000
     0.210 ( 0.002 ms): sleep/31680 close(fd: 3) = 0
     0.230 ( 0.002 ms): sleep/31680 arch_prctl(option: 4098, arg2: 140121632638208) = 0
     0.306 ( 0.009 ms): sleep/31680 mprotect(start: 0x7f709c025000, len: 16384, prot: READ) = 0
     0.338 ( 0.005 ms): sleep/31680 mprotect(start: 0x556529607000, len: 4096, prot: READ) = 0
     0.348 ( 0.005 ms): sleep/31680 mprotect(start: 0x7f709c253000, len: 4096, prot: READ) = 0
     0.356 ( 0.019 ms): sleep/31680 munmap(addr: 0x7f709c239000, len: 103334) = 0
     0.463 ( 0.002 ms): sleep/31680 brk() = 0x55652a851000
     0.468 ( 0.004 ms): sleep/31680 brk(brk: 0x55652a872000) = 0x55652a872000
     0.474 ( 0.002 ms): sleep/31680 brk() = 0x55652a872000
     0.484 ( 0.008 ms): sleep/31680 open(filename: , flags: CLOEXEC) = 3
     0.497 ( 0.002 ms): sleep/31680 fstat(fd: 3, statbuf: 0x7f709c02aaa0) = 0
     0.501 ( 0.006 ms): sleep/31680 mmap(len: 113045344, prot: READ, flags: PRIVATE, fd: 3) = 0x7f70950aa000
     0.514 ( 0.002 ms): sleep/31680 close(fd: 3) = 0
     0.554 (1000.140 ms): sleep/31680 nanosleep(rqtp: 0x7ffc5269eed0) = 0
  1000.734 ( 0.007 ms): sleep/31680 close(fd: 1) = 0
  1000.748 ( 0.004 ms): sleep/31680 close(fd: 2) = 0
  1000.769 (         ): sleep/31680 exit_group()
  #

Now to allow selecting which syscalls should be traced, using a map.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-votqqmqhag8e1i9mgyzfez3o@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>