| commit | 18173559a23e28055640b152e623d9f0d40ecca8 | |
| author | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | |
| Fri, 21 Aug 2015 19:39:01 +0000 (21 14:39 -0500) | ||
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | |
| Tue, 25 Aug 2015 16:45:56 +0000 (25 13:45 -0300) | ||
| tree | f8c6124358298856fd939b2a6cf77a34d3dfaa46 | treesnapshot (tar.gz zip) |
| parent | fe7faec3e56a8dd64f78023a2f4a74fc8d42e79f | commitdiff |
powerpc: Fix tabort usage in syscalls
Fix usage of tabort in generated syscalls. r0 has special meaning
when used with this instruction, thus it will not generate
persistent errors, nor return an error code. This mitigates poor
CPU usage when performing elided critical sections.
Additionally, transactions should be aborted when entering a user
invoked syscall. Otherwise the results of the transaction may be
undefined.
2015-08-25 Paul E. Murphy <murphyp@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc32/sysdep.h (ABORT_TRANSACTION): Use
register other than r0 for tabort, it has special meaning.
* sysdeps/powerpc/powerpc64/sysdep.h (ABORT_TRANSACTION): Likewise
* sysdeps/unix.sysv/linux/powerpc/syscall.S (syscall): Abort
transaction before starting syscall.
Fix usage of tabort in generated syscalls. r0 has special meaning
when used with this instruction, thus it will not generate
persistent errors, nor return an error code. This mitigates poor
CPU usage when performing elided critical sections.
Additionally, transactions should be aborted when entering a user
invoked syscall. Otherwise the results of the transaction may be
undefined.
2015-08-25 Paul E. Murphy <murphyp@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc32/sysdep.h (ABORT_TRANSACTION): Use
register other than r0 for tabort, it has special meaning.
* sysdeps/powerpc/powerpc64/sysdep.h (ABORT_TRANSACTION): Likewise
* sysdeps/unix.sysv/linux/powerpc/syscall.S (syscall): Abort
transaction before starting syscall.