diff options
Diffstat (limited to 'sysdeps/powerpc/sysdep.h')
| -rw-r--r-- | sysdeps/powerpc/sysdep.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sysdeps/powerpc/sysdep.h b/sysdeps/powerpc/sysdep.h index 3d37b1b92e..e32168e8f4 100644 --- a/sysdeps/powerpc/sysdep.h +++ b/sysdeps/powerpc/sysdep.h @@ -21,6 +21,10 @@ */ #define _SYSDEPS_SYSDEP_H 1 #include <bits/hwcap.h> +#ifdef ENABLE_LOCK_ELISION +#include <tls.h> +#include <htm.h> +#endif #define PPC_FEATURE_970 (PPC_FEATURE_POWER4 + PPC_FEATURE_HAS_ALTIVEC) @@ -164,4 +168,22 @@ #define ALIGNARG(log2) log2 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name +#else + +/* Linux kernel powerpc documentation [1] states issuing a syscall inside a + transaction is not recommended and may lead to undefined behavior. It + also states syscalls do not abort transactions. To avoid such traps, + we abort transaction just before syscalls. + + [1] Documentation/powerpc/transactional_memory.txt [Syscalls] */ +#if !IS_IN(rtld) && defined (ENABLE_LOCK_ELISION) +# define ABORT_TRANSACTION \ + ({ \ + if (THREAD_GET_TM_CAPABLE ()) \ + __builtin_tabort (_ABORT_SYSCALL); \ + }) +#else +# define ABORT_TRANSACTION +#endif + #endif /* __ASSEMBLER__ */ |