$ valgrind --version
valgrind-3.11.0

$ uname -p
aarch64

$ cat test.c
#include <unistd.h>
#include <sys/mman.h>

int main() {
  unsigned char c;
  mincore(0, 1, &c);
}

$ gcc test.c

$ valgrind ./a.out
==10743== Memcheck, a memory error detector
==10743== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==10743== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==10743== Command: ./a.out
==10743== 
--10743-- WARNING: unhandled arm64-linux syscall: 232
--10743-- You may be able to write your own handler.
--10743-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--10743-- Nevertheless we consider this a bug.  Please report
--10743-- it at http://valgrind.org/support/bug_reports.html.
==10743== 
==10743== HEAP SUMMARY:
==10743==     in use at exit: 0 bytes in 0 blocks
==10743==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==10743== 
==10743== All heap blocks were freed -- no leaks are possible
==10743== 
==10743== For counts of detected and suppressed errors, rerun with: -v
==10743== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)