diff options
| author | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2015-12-28 12:24:43 -0200 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2016-01-08 17:47:33 -0200 |
| commit | 42bf1c897170ff951c7fd0ee9da25f97ff787396 (patch) | |
| tree | 3e69cd2d5201944482407b86b4854fe75ab34f12 /sysdeps/unix/sysv/linux/powerpc/htm.h | |
| parent | bc49a7afd38c1bd00f0ad9fd6592a5959d5ba72e (diff) | |
| download | glibc-42bf1c897170ff951c7fd0ee9da25f97ff787396.zip glibc-42bf1c897170ff951c7fd0ee9da25f97ff787396.tar.gz glibc-42bf1c897170ff951c7fd0ee9da25f97ff787396.tar.bz2 | |
powerpc: Enforce compiler barriers on hardware transactions
Work around a GCC behavior with hardware transactional memory built-ins.
GCC doesn't treat the PowerPC transactional built-ins as compiler
barriers, moving instructions past the transaction boundaries and
altering their atomicity.
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/htm.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/htm.h | 39 |
1 files changed, 35 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/htm.h b/sysdeps/unix/sysv/linux/powerpc/htm.h index b18b47e..16b2237 100644 --- a/sysdeps/unix/sysv/linux/powerpc/htm.h +++ b/sysdeps/unix/sysv/linux/powerpc/htm.h @@ -118,13 +118,44 @@ __ret; \ }) -#define __builtin_tbegin(tdb) _tbegin () -#define __builtin_tend(nested) _tend () -#define __builtin_tabort(abortcode) _tabort (abortcode) -#define __builtin_get_texasru() _texasru () +#define __libc_tbegin(tdb) _tbegin () +#define __libc_tend(nested) _tend () +#define __libc_tabort(abortcode) _tabort (abortcode) +#define __builtin_get_texasru() _texasru () #else # include <htmintrin.h> + +# ifdef __TM_FENCE__ + /* New GCC behavior. */ +# define __libc_tbegin(R) __builtin_tbegin (R); +# define __libc_tend(R) __builtin_tend (R); +# define __libc_tabort(R) __builtin_tabort (R); +# else + /* Workaround an old GCC behavior. Earlier releases of GCC 4.9 and 5.0, + didn't use to treat __builtin_tbegin, __builtin_tend and + __builtin_tabort as compiler barriers, moving instructions into and + out the transaction. + Remove this when glibc drops support for GCC 5.0. */ +# define __libc_tbegin(R) \ + ({ __asm__ volatile("" ::: "memory"); \ + unsigned int __ret = __builtin_tbegin (R); \ + __asm__ volatile("" ::: "memory"); \ + __ret; \ + }) +# define __libc_tabort(R) \ + ({ __asm__ volatile("" ::: "memory"); \ + unsigned int __ret = __builtin_tabort (R); \ + __asm__ volatile("" ::: "memory"); \ + __ret; \ + }) +# define __libc_tend(R) \ + ({ __asm__ volatile("" ::: "memory"); \ + unsigned int __ret = __builtin_tend (R); \ + __asm__ volatile("" ::: "memory"); \ + __ret; \ + }) +# endif /* __TM_FENCE__ */ #endif /* __HTM__ */ #endif /* __ASSEMBLER__ */ |