[v2,4/9] i386, x86: Use libc_ifunc macro for time, gettimeofday.
Commit Message
This patch uses the libc_ifunc_redirected macro to create already existing ifunc
functions time and gettimeofday on intel. This way, the libc_hidden_def macro can
be used instead of the libc_ifunc_hidden_def one which was only used here. Thus the
macro is removed from libc-symbols.h.
On i386, the __GI_* symbols do not target the ifunc symbol and thus the
redirection construct has to be applied here.
ChangeLog:
* sysdeps/unix/sysv/linux/x86/gettimeofday.c (__gettimeofday):
Use libc_ifunc_redirected macro. Use libc_hidden_def instead of
libc_ifunc_hidden_def.
* sysdeps/unix/sysv/linux/x86/time.c (time): Likewise.
* sysdeps/unix/sysv/linux/i386/gettimeofday.c (__gettimeofday):
Redirect ifunced function in header for using it as type of ifunc'ed
function. Redefine libc_hidden_def to use fallback non ifunc'ed
fallback function for __GI_* symbol.
* sysdeps/unix/sysv/linux/i386/time.c (time): Likewise.
* include/libc-symbols.h
(libc_ifunc_hidden_def, libc_ifunc_hidden_def1): Delete macro.
---
include/libc-symbols.h | 15 ---------------
sysdeps/unix/sysv/linux/i386/gettimeofday.c | 14 ++++++++++----
sysdeps/unix/sysv/linux/i386/time.c | 14 +++++++++++---
sysdeps/unix/sysv/linux/x86/gettimeofday.c | 28 ++++++++++++++--------------
sysdeps/unix/sysv/linux/x86/time.c | 25 ++++++++++++-------------
5 files changed, 47 insertions(+), 49 deletions(-)
@@ -738,21 +738,6 @@ for linking")
#define libm_ifunc_init()
#define libm_ifunc(name, expr) __ifunc (name, name, expr, void, libm_ifunc_init)
-#ifdef HAVE_ASM_SET_DIRECTIVE
-# define libc_ifunc_hidden_def1(local, name) \
- __asm__ (".globl " #local "\n\t" \
- ".hidden " #local "\n\t" \
- ".set " #local ", " #name);
-#else
-# define libc_ifunc_hidden_def1(local, name) \
- __asm__ (".globl " #local "\n\t" \
- ".hidden " #local "\n\t" \
- #local " = " #name);
-#endif
-
-#define libc_ifunc_hidden_def(name) \
- libc_ifunc_hidden_def1 (__GI_##name, name)
-
/* Add the compiler optimization to inhibit loop transformation to library
calls. This is used to avoid recursive calls in memset and memmove
default implementations. */
@@ -16,14 +16,20 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+#ifdef SHARED
+# define __gettimeofday __redirect___gettimeofday
+#endif
+
#include <sys/time.h>
#ifdef SHARED
+# undef __gettimeofday
+# define __gettimeofday_type __redirect___gettimeofday
-# undef libc_ifunc_hidden_def
-# define libc_ifunc_hidden_def(name) \
- libc_ifunc_hidden_def1 (__GI_##name, __gettimeofday_syscall)
-
+# undef libc_hidden_def
+# define libc_hidden_def(name) \
+ __hidden_ver1 (__gettimeofday_syscall, __GI___gettimeofday, \
+ __gettimeofday_syscall);
#endif
#include <sysdeps/unix/sysv/linux/x86/gettimeofday.c>
@@ -17,10 +17,18 @@
<http://www.gnu.org/licenses/>. */
#ifdef SHARED
+# define time __redirect_time
+#endif
+
+#include <time.h>
+
+#ifdef SHARED
+# undef time
+# define time_type __redirect_time
-# undef libc_ifunc_hidden_def
-# define libc_ifunc_hidden_def(name) \
- libc_ifunc_hidden_def1 (__GI_##name, __time_syscall)
+# undef libc_hidden_def
+# define libc_hidden_def(name) \
+ __hidden_ver1 (__time_syscall, __GI_time, __time_syscall);
#endif
#include <sysdeps/unix/sysv/linux/x86/time.c>
@@ -29,20 +29,20 @@ __gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
}
-void *gettimeofday_ifunc (void) __asm__ ("__gettimeofday");
-
-void *
-gettimeofday_ifunc (void)
-{
- PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
-
- /* If the vDSO is not available we fall back to syscall. */
- return (_dl_vdso_vsym ("__vdso_gettimeofday", &linux26)
- ?: (void*) (&__gettimeofday_syscall));
-}
-asm (".type __gettimeofday, %gnu_indirect_function");
-
-libc_ifunc_hidden_def(__gettimeofday)
+# ifndef __gettimeofday_type
+/* The i386 gettimeofday.c includes this file with a defined
+ __gettimeofday_type macro. For x86_64 we have to define it to __gettimeofday
+ as the internal symbol is the ifunc'ed one. */
+# define __gettimeofday_type __gettimeofday
+# endif
+
+# undef INIT_ARCH
+# define INIT_ARCH() PREPARE_VERSION_KNOWN (linux26, LINUX_2_6)
+/* If the vDSO is not available we fall back to syscall. */
+libc_ifunc_redirected (__gettimeofday_type, __gettimeofday,
+ (_dl_vdso_vsym ("__vdso_gettimeofday", &linux26)
+ ?: &__gettimeofday_syscall))
+libc_hidden_def (__gettimeofday)
#else
@@ -30,20 +30,19 @@ __time_syscall (time_t *t)
return INTERNAL_SYSCALL (time, err, 1, t);
}
-void *time_ifunc (void) __asm__ ("time");
-
-void *
-time_ifunc (void)
-{
- PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
-
+# ifndef time_type
+/* The i386 time.c includes this file with a defined time_type macro.
+ For x86_64 we have to define it to time as the internal symbol is the
+ ifunc'ed one. */
+# define time_type time
+# endif
+
+#undef INIT_ARCH
+#define INIT_ARCH() PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
/* If the vDSO is not available we fall back on the syscall. */
- return _dl_vdso_vsym ("__vdso_time", &linux26)
- ?: (void*) &__time_syscall;
-}
-asm (".type time, %gnu_indirect_function");
-
-libc_ifunc_hidden_def(time)
+libc_ifunc_redirected (time_type, time, (_dl_vdso_vsym ("__vdso_time", &linux26)
+ ?: &__time_syscall))
+libc_hidden_def (time)
#else