diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/htm.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/htm.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/htm.h b/sysdeps/unix/sysv/linux/s390/htm.h index 32d5a88..70d7f66 100644 --- a/sysdeps/unix/sysv/linux/s390/htm.h +++ b/sysdeps/unix/sysv/linux/s390/htm.h @@ -119,11 +119,16 @@ ar modification and fp operations. Some \ program-interruptions (e.g. a null \ pointer access) are filtered and the \ - trancsaction will abort. In this case \ + transaction will abort. In this case \ the normal lock path will execute it \ again and result in a core dump wich does \ now show at tbegin but the real executed \ - instruction. */ \ + instruction. \ + However it is not guaranteed that this \ + retry operate on the same data and thus \ + may not end in an program-interruption. \ + Note: This could also be used to probe \ + memory for being accessible! */ \ "2: tbegin 0, 0xFF0E\n\t" \ /* Branch away in abort case (this is the \ prefered sequence. See PoP in chapter 5 \ @@ -152,7 +157,8 @@ __ret; \ }) -/* These builtins are correct. Use them. */ +/* These builtins are usable in context of glibc lock elision code without any + changes. Use them. */ #define __libc_tend() \ ({ __asm__ __volatile__ (".machine push\n\t" \ ".machinemode \"zarch_nohighgprs\"\n\t" \ |