s390: Enable VDSO for static linking

Although s390 only enables vDSO for dynamically linked elf binaries
(arch/s390/kernel/vdso.c:217), there is no indication in the code or
associated commit message for why not enable it for statically linked
binaries as well.  To double check, I rebuilt a kernel with the
check removed and the vDSO does work for static build for supplied
symbols.

Checked on s390x-linux-gnu and s390-linux-gnu.

	[BZ #19767]
	* sysdeps/unix/sysv/linux/s390/init-first.c: Remove #ifdef SHARED.
	* sysdeps/unix/sysv/linux/s390/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
	(ALWAYS_USE_VSYSCALL): Define.
	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.

diff --git a/ChangeLog b/ChangeLog
index bd12f2d..c9d7631 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,14 @@
 2019-08-05  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
        [BZ #19767]
+       * sysdeps/unix/sysv/linux/s390/init-first.c: Remove #ifdef SHARED.
+       * sysdeps/unix/sysv/linux/s390/libc-vdso.h: Likewise.
+       * sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+       (ALWAYS_USE_VSYSCALL): Define.
+       * sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+       (ALWAYS_USE_VSYSCALL): Likewise.
+
+       [BZ #19767]
        * sysdeps/unix/sysv/linux/riscv/init-first.c: Remove #ifdef SHARED.
        * sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/sysdep.h (ALWAYS_USE_VSYSCALL):

diff --git a/sysdeps/unix/sysv/linux/s390/init-first.c b/sysdeps/unix/sysv/linux/s390/init-first.c
index 1f46e80..8c54d13 100644 (file)
--- a/sysdeps/unix/sysv/linux/s390/init-first.c
+++ b/sysdeps/unix/sysv/linux/s390/init-first.c
@@ -16,9 +16,8 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifdef SHARED
-# include <dl-vdso.h>
-# include <libc-vdso.h>
+#include <dl-vdso.h>
+#include <libc-vdso.h>
 
 long int (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *)
    attribute_hidden;
@@ -54,7 +53,4 @@ _libc_vdso_platform_setup (void)
   VDSO_SYMBOL (getcpu) = p;
 }
 
-# define VDSO_SETUP _libc_vdso_platform_setup
-#endif
-
 #include <csu/init-first.c>

diff --git a/sysdeps/unix/sysv/linux/s390/libc-vdso.h b/sysdeps/unix/sysv/linux/s390/libc-vdso.h
index 5e2d1e4..cc97601 100644 (file)
--- a/sysdeps/unix/sysv/linux/s390/libc-vdso.h
+++ b/sysdeps/unix/sysv/linux/s390/libc-vdso.h
@@ -20,8 +20,6 @@
 #ifndef _LIBC_VDSO_H
 #define _LIBC_VDSO_H
 
-#ifdef SHARED
-
 #include <sysdep-vdso.h>
 
 extern long int (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *)
@@ -33,6 +31,5 @@ extern long int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *);
 
 extern long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
    attribute_hidden;
-#endif
 
 #endif /* _LIBC_VDSO_H */

diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
index 640fb52..47d1c5c 100644 (file)
--- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
@@ -19,6 +19,9 @@
 #ifndef _LINUX_S390_SYSDEP_H
 #define _LINUX_S390_SYSDEP_H
 
+/* Always enable vsyscalls on s390-32.  */
+#define ALWAYS_USE_VSYSCALL 1
+
 #include <sysdeps/s390/s390-32/sysdep.h>
 #include <sysdeps/unix/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>

diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
index 9a9834c..2552aaa 100644 (file)
--- a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
@@ -20,6 +20,9 @@
 #ifndef _LINUX_S390_SYSDEP_H
 #define _LINUX_S390_SYSDEP_H
 
+/* Always enable vsyscalls on s390-64.  */
+#define ALWAYS_USE_VSYSCALL 1
+
 #include <sysdeps/s390/s390-64/sysdep.h>
 #include <sysdeps/unix/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>