Bug 434283

Hi,

valgrind does not seem to support LDAXP and STLXP on Arm64.


==1782== Memcheck, a memory error detector
==1782== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==1782== Using Valgrind-3.17.0.GIT and LibVEX; rerun with -h for copyright info
==1782== Command: /.../my-app
==1782==
...
ARM64 front end: load_store
disInstr(arm64): unhandled instruction 0xC87FAB5F
disInstr(arm64): 1100'1000 0111'1111 1010'1011 0101'1111
==1782== valgrind: Unrecognised instruction at address 0xb04db58.
==1782==    at 0xB04DB58: ??? (in /system/lib64/libThirdParty.so)
==1782== Your program just tried to execute an instruction that Valgrind
==1782== did not recognise.  There are two possible reasons for this.
==1782== 1. Your program has a bug and erroneously jumped to a non-code
==1782==    location.  If you are running Memcheck and you just saw a
==1782==    warning about a bad jump, it's probably your program's fault.
==1782== 2. The instruction is legitimate but Valgrind doesn't handle it,
==1782==    i.e. it's Valgrind's fault.  If you think this is the case or
==1782==    you are not sure, please let us know and we'll try to fix it.
==1782== Either way, Valgrind will now raise a SIGILL signal which will
==1782== probably kill your program.
Killed


...
  34841c:       c87fab5f        ldaxp   xzr, x10, [x26]
  348420:       c82aa349        stlxp   w10, x9, x8, [x26]
...

Thanks,
Antonio