linux: Enable vDSO for static linking as default (BZ#19767)

This patch assumes static vDSO is supported as default, it is now supported
on all current architectures that support vDSO.  It allows removing both
ALWAYS_USE_VSYSCALL define, which an architecture requires to explicit define
and USE_VSYSCALL (which defines vDSO only for shared or if architecture defines
ALWAYS_USE_VSYSCALL).

Checked with a build against all affected ABIs.

	[BZ #19767]
	* sysdeps/unix/sysv/linux/aarch64/sysdep.h (ALWAYS_USE_VSYSCALL):
	Remove definition.
	* sysdeps/unix/sysv/linux/arm/sysdep.h (ALWAYS_USE_VSYSCALL):
	Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep.h (ALWAYS_USE_VSYSCALL):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h (ALWAYS_USE_VSYSCALL):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/riscv/sysdep.h (ALWAYS_USE_VSYSCALL):
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/sparc/sysdep.h (ALWAYS_USE_VSYSCALL):
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/sysdep.h (ALWAYS_USE_VSYSCALL):
	Likewise.
	* sysdeps/unix/sysv/linux/x86/libc-vdso.h: Remove #if USE_VSYSCALL.
	* sysdeps/unix/sysv/linux/sysdep-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/sysdep.h (ALWAYS_USE_VSYSCALL,
	USE_VSYSCALL): Remove defitions.

17 files changed, 34 insertions, 52 deletions

diff --git a/ChangeLog b/ChangeLog
index 5fd2019..2e21197 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,38 @@
 2019-08-05  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
 	[BZ #19767]
+	* sysdeps/unix/sysv/linux/aarch64/sysdep.h (ALWAYS_USE_VSYSCALL):
+	Remove definition.
+	* sysdeps/unix/sysv/linux/arm/sysdep.h (ALWAYS_USE_VSYSCALL):
+	Likewise.
+	* sysdeps/unix/sysv/linux/i386/sysdep.h (ALWAYS_USE_VSYSCALL):
+	Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h (ALWAYS_USE_VSYSCALL):
+	Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
+	(ALWAYS_USE_VSYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
+	(ALWAYS_USE_VSYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+	(ALWAYS_USE_VSYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
+	(ALWAYS_USE_VSYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/riscv/sysdep.h (ALWAYS_USE_VSYSCALL):
+	Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+	(ALWAYS_USE_VSYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+	(ALWAYS_USE_VSYSCALL): Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sysdep.h (ALWAYS_USE_VSYSCALL):
+	Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/sysdep.h (ALWAYS_USE_VSYSCALL):
+	Likewise.
+	* sysdeps/unix/sysv/linux/x86/libc-vdso.h: Remove #if USE_VSYSCALL.
+	* sysdeps/unix/sysv/linux/sysdep-vdso.h: Likewise.
+	* sysdeps/unix/sysv/linux/sysdep.h (ALWAYS_USE_VSYSCALL,
+	USE_VSYSCALL): Remove defitions.
+
+	[BZ #19767]
 	* sysdeps/unix/sysv/linux/sparc/init-first.c: Remove #ifdef SHARED.
 	* sysdeps/unix/sysv/linux/sparc/libc-vdso.h: Likewise.
 	* sysdeps/unix/sysv/linux/sparc/sysdep.h (ALWAYS_USE_VSYSCALL):
diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
index 935c507f..a2f4061 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
@@ -19,9 +19,6 @@
 #ifndef _LINUX_AARCH64_SYSDEP_H
 #define _LINUX_AARCH64_SYSDEP_H 1
 
-/* Always enable vsyscalls on aarch64 */
-#define ALWAYS_USE_VSYSCALL 1
-
 #include <sysdeps/unix/sysdep.h>
 #include <sysdeps/aarch64/sysdep.h>
 #include <sysdeps/unix/sysv/linux/generic/sysdep.h>
diff --git a/sysdeps/unix/sysv/linux/arm/sysdep.h b/sysdeps/unix/sysv/linux/arm/sysdep.h
index 9b4ed8d..6d8d9a4 100644
--- a/sysdeps/unix/sysv/linux/arm/sysdep.h
+++ b/sysdeps/unix/sysv/linux/arm/sysdep.h
@@ -20,9 +20,6 @@
 #ifndef _LINUX_ARM_SYSDEP_H
 #define _LINUX_ARM_SYSDEP_H 1
 
-/* Always enable vsyscalls on arm */
-#define ALWAYS_USE_VSYSCALL 1
-
 /* There is some commonality.  */
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/arm/sysdep.h>
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
index 0be1074..77154b9 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
@@ -19,9 +19,6 @@
 #ifndef _LINUX_I386_SYSDEP_H
 #define _LINUX_I386_SYSDEP_H 1
 
-/* Always enable vsyscalls on i386 */
-#define ALWAYS_USE_VSYSCALL 1
-
 /* There is some commonality.  */
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/i386/sysdep.h>
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
index 5a2704e..a310a0a 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
@@ -18,9 +18,6 @@
 #ifndef _LINUX_MIPS_MIPS32_SYSDEP_H
 #define _LINUX_MIPS_MIPS32_SYSDEP_H 1
 
-/* Always enable vsyscalls on mips32.  */
-#define ALWAYS_USE_VSYSCALL 1
-
 /* There is some commonality.  */
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/mips/mips32/sysdep.h>
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
index a4f3547..d83e08f 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
@@ -18,9 +18,6 @@
 #ifndef _LINUX_MIPS_SYSDEP_H
 #define _LINUX_MIPS_SYSDEP_H 1
 
-/* Always enable vsyscalls on n32.  */
-#define ALWAYS_USE_VSYSCALL 1
-
 /* There is some commonality.  */
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/mips/mips64/n32/sysdep.h>
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
index 5b4d277..bcfaf56 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
@@ -18,9 +18,6 @@
 #ifndef _LINUX_MIPS_SYSDEP_H
 #define _LINUX_MIPS_SYSDEP_H 1
 
-/* Always enable vsyscalls on n64.  */
-#define ALWAYS_USE_VSYSCALL 1
-
 /* There is some commonality.  */
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/mips/mips64/n64/sysdep.h>
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
index bdbab8e..62caa26 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
@@ -18,9 +18,6 @@
 #ifndef _LINUX_POWERPC_SYSDEP_H
 #define _LINUX_POWERPC_SYSDEP_H 1
 
-/* Always enable vsyscalls on powerpc32 */
-#define ALWAYS_USE_VSYSCALL 1
-
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/powerpc/sysdep.h>
 #include <tls.h>
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
index 294517e..4122e5c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
@@ -20,9 +20,6 @@
 #ifndef _LINUX_POWERPC_SYSDEP_H
 #define _LINUX_POWERPC_SYSDEP_H 1
 
-/* Always enable vsyscalls on powerpc64 */
-#define ALWAYS_USE_VSYSCALL 1
-
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/powerpc/sysdep.h>
 #include <tls.h>
diff --git a/sysdeps/unix/sysv/linux/riscv/sysdep.h b/sysdeps/unix/sysv/linux/riscv/sysdep.h
index caf013a..5470ea3 100644
--- a/sysdeps/unix/sysv/linux/riscv/sysdep.h
+++ b/sysdeps/unix/sysv/linux/riscv/sysdep.h
@@ -19,9 +19,6 @@
 #ifndef _LINUX_RISCV_SYSDEP_H
 #define _LINUX_RISCV_SYSDEP_H 1
 
-/* Always enable vsyscalls on riscv */
-#define ALWAYS_USE_VSYSCALL 1
-
 #include <sysdeps/unix/sysv/linux/generic/sysdep.h>
 #include <tls.h>
 
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
index 47d1c5c..640fb52 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
@@ -19,9 +19,6 @@
 #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 2552aaa..9a9834c 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
@@ -20,9 +20,6 @@
 #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>
diff --git a/sysdeps/unix/sysv/linux/sparc/sysdep.h b/sysdeps/unix/sysv/linux/sparc/sysdep.h
index fc4053c..981b2a2 100644
--- a/sysdeps/unix/sysv/linux/sparc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sparc/sysdep.h
@@ -19,9 +19,6 @@
 #ifndef _LINUX_SPARC_SYSDEP_H
 #define _LINUX_SPARC_SYSDEP_H 1
 
-/* Always enable vsyscalls on sparc */
-#define ALWAYS_USE_VSYSCALL 1
-
 #include <sysdeps/unix/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/sparc/sysdep.h>
diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h
index c5a1ae0..5fec208 100644
--- a/sysdeps/unix/sysv/linux/sysdep-vdso.h
+++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h
@@ -26,7 +26,7 @@
      funcptr (args)
 #endif
 
-#if USE_VSYSCALL && defined HAVE_VSYSCALL
+#ifdef HAVE_VSYSCALL
 
 # include <libc-vdso.h>
 
diff --git a/sysdeps/unix/sysv/linux/sysdep.h b/sysdeps/unix/sysv/linux/sysdep.h
index f94cfa2..af1c9a2 100644
--- a/sysdeps/unix/sysv/linux/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sysdep.h
@@ -18,13 +18,6 @@
 #include <bits/wordsize.h>
 #include <kernel-features.h>
 
-/* By default only shared builds use vdso. */
-#ifndef ALWAYS_USE_VSYSCALL
-#define ALWAYS_USE_VSYSCALL 0
-#endif
-
-#define USE_VSYSCALL (defined (SHARED) || ALWAYS_USE_VSYSCALL)
-
 /* Set error number and return -1.  A target may choose to return the
    internal function, __syscall_error, which sets errno and returns -1.
    We use -1l, instead of -1, so that it can be casted to (void *).  */
diff --git a/sysdeps/unix/sysv/linux/x86/libc-vdso.h b/sysdeps/unix/sysv/linux/x86/libc-vdso.h
index ea35c71..c9aa1c8 100644
--- a/sysdeps/unix/sysv/linux/x86/libc-vdso.h
+++ b/sysdeps/unix/sysv/linux/x86/libc-vdso.h
@@ -22,9 +22,7 @@
 #include <time.h>
 #include <sys/time.h>
 
-#if USE_VSYSCALL
-
-# include <sysdep-vdso.h>
+#include <sysdep-vdso.h>
 
 extern long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
   attribute_hidden;
@@ -32,6 +30,4 @@ extern long int (*VDSO_SYMBOL(clock_gettime)) (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/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
index b88c46b..0a3ddd3 100644
--- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
@@ -18,9 +18,6 @@
 #ifndef _LINUX_X86_64_SYSDEP_H
 #define _LINUX_X86_64_SYSDEP_H 1
 
-/* Always enable vsyscalls on x86_64 */
-#define ALWAYS_USE_VSYSCALL 1
-
 /* There is some commonality.  */
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/x86_64/sysdep.h>