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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-11-07 12:34:52 -0500 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2015-01-12 06:32:08 -0500 |
| commit | 56cf2763819d2f721c98f2b8bcc04a3c673837d3 (patch) | |
| tree | 5d2fde37897779f64b83951c1ef99406fd384055 /sysdeps/powerpc/powerpc32/sysdep.h | |
| parent | 4b45943a6f62cfc239e79ad8902f5c7f71fd13ec (diff) | |
| download | glibc-56cf2763819d2f721c98f2b8bcc04a3c673837d3.tar.gz glibc-56cf2763819d2f721c98f2b8bcc04a3c673837d3.tar.xz glibc-56cf2763819d2f721c98f2b8bcc04a3c673837d3.zip | |
powerpc: abort transaction in syscalls
Linux kernel powerpc documentation states issuing a syscall inside a transaction is not recommended and may lead to undefined behavior. It also states syscalls does not abort transactoin neither they run in transactional state. To avoid side-effects being visible outside transactions, GLIBC with lock elision enabled will issue a transaction abort instruction just before all syscalls if hardware supports hardware transactions.
Diffstat (limited to 'sysdeps/powerpc/powerpc32/sysdep.h')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/sysdep.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/sysdep.h b/sysdeps/powerpc/powerpc32/sysdep.h index ff05e76047..e16fe3e224 100644 --- a/sysdeps/powerpc/powerpc32/sysdep.h +++ b/sysdeps/powerpc/powerpc32/sysdep.h @@ -88,7 +88,23 @@ GOT_LABEL: ; \ cfi_endproc; \ ASM_SIZE_DIRECTIVE(name) +#if ! IS_IN(rtld) && defined (ENABLE_LOCK_ELISION) +# define ABORT_TRANSACTION \ + cmpwi 2,0; \ + beq 1f; \ + lwz 0,TM_CAPABLE(2); \ + cmpwi 0,0; \ + beq 1f; \ + li 0,_ABORT_SYSCALL; \ + tabort. 0; \ + .align 4; \ +1: +#else +# define ABORT_TRANSACTION +#endif + #define DO_CALL(syscall) \ + ABORT_TRANSACTION \ li 0,syscall; \ sc |