Remove PREPARE_VERSION and PREPARE_VERSION_KNOW

This patch removes the PREPARE_VERSION and PREPARE_VERSION_KNOW macro
and uses a static inline function instead, get_vdso_symbol.  Each
architecture that supports vDSO must define the Linux version and its
hash for symbol resolution (VDSO_NAME and VDSO_HASH macro respectively).

It also organizes the HAVE_*_VSYSCALL for mips, powerpc, and s390 to
define them on a common header.

The idea is to require less code to configure and enable vDSO support
for newer ports.  No semantic changes are expected.

Checked with a build against all affected architectures.

	* sysdeps/unix/make-syscalls.sh: Make vDSO call use get_vdso_symbol.
	* sysdeps/unix/sysv/linux/aarch64/gettimeofday.c (__gettimeofday):
	Use get_vdso_symbol instead of _dl_vdso_vsym.
	* sysdeps/unix/sysv/linux/powerpc/time.c (time): Likewise.
	* sysdeps/unix/sysv/linux/riscv/flush-icache.c
	(__lookup_riscv_flush_icache): Likewise.
	* sysdeps/unix/sysv/linux/x86/gettimeofday.c (__gettimeofday):
	Likewise.
	* sysdeps/unix/sysv/linux/x86/time.c (time): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/gettimeofday.c: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/arm/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sysdep.h (VDSO_NAME, VDSO_HASH):
	Define.
	* sysdeps/unix/sysv/linux/arm/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/riscv/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/sparc/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/sysdep.h (VDSO_NAME, VDSO_HASH):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Remove
	definition.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
	(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL, HAVE_GETCPU_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
	(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL, HAVE_GETCPU_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/mips/sysdep.h: New file.
	* sysdeps/unix/sysv/linux/powerpc/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/dl-vdso.h (PREPARE_VERSION,
	PREPARE_VERSION_KNOWN, VDSO_NAME_LINUX_2_6, VDSO_HASH_LINUX_2_6,
	VDSO_NAME_LINUX_2_6_15, VDSO_HASH_LINUX_2_6_15,
	VDSO_NAME_LINUX_2_6_29, VDSO_HASH_LINUX_2_6_29,
	VDSO_NAME_LINUX_4_15, VDSO_HASH_LINUX_4_15): Remove defines.
	(get_vdso_symbol): New function.

6 files changed, 40 insertions, 30 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
index 7605357307..40549fe6dd 100644
--- a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
@@ -57,9 +57,8 @@ __gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
   return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
 }
 
-# define INIT_ARCH()						\
-  PREPARE_VERSION_KNOWN (linux2615, LINUX_2_6_15);		\
-  void *vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615);
+# define INIT_ARCH() \
+  void *vdso_gettimeofday = get_vdso_symbol ("__kernel_gettimeofday")
 
 /* If the vDSO is not available we fall back syscall.  */
 libc_ifunc_hidden (__redirect___gettimeofday, __gettimeofday,
diff --git a/sysdeps/unix/sysv/linux/powerpc/init-first.c b/sysdeps/unix/sysv/linux/powerpc/init-first.c
index 4b285fb842..b1618ed0b1 100644
--- a/sysdeps/unix/sysv/linux/powerpc/init-first.c
+++ b/sysdeps/unix/sysv/linux/powerpc/init-first.c
@@ -37,29 +37,27 @@ void *VDSO_SYMBOL(sigtramp_rt32);
 static inline void
 _libc_vdso_platform_setup (void)
 {
-  PREPARE_VERSION_KNOWN (linux2615, LINUX_2_6_15);
-
-  void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615);
+  void *p = get_vdso_symbol ("__kernel_gettimeofday");
   PTR_MANGLE (p);
   VDSO_SYMBOL (gettimeofday) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux2615);
+  p = get_vdso_symbol ("__kernel_clock_gettime");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_gettime) = p;
 
-  p = _dl_vdso_vsym ("__kernel_clock_getres", &linux2615);
+  p = get_vdso_symbol ("__kernel_clock_getres");
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_getres) = p;
 
-  p = _dl_vdso_vsym ("__kernel_get_tbfreq", &linux2615);
+  p = get_vdso_symbol ("__kernel_get_tbfreq");
   PTR_MANGLE (p);
   VDSO_SYMBOL (get_tbfreq) = p;
 
-  p = _dl_vdso_vsym ("__kernel_getcpu", &linux2615);
+  p = get_vdso_symbol ("__kernel_getcpu");
   PTR_MANGLE (p);
   VDSO_SYMBOL (getcpu) = p;
 
-  p = _dl_vdso_vsym ("__kernel_time", &linux2615);
+  p = get_vdso_symbol ("__kernel_time");
   PTR_MANGLE (p);
   VDSO_SYMBOL (time) = p;
 
@@ -69,12 +67,10 @@ _libc_vdso_platform_setup (void)
      There is no need to pointer mangle these symbol because they will
      used only for pointer comparison.  */
 #if defined(__PPC64__) || defined(__powerpc64__)
-  VDSO_SYMBOL(sigtramp_rt64) = _dl_vdso_vsym ("__kernel_sigtramp_rt64",
-					      &linux2615);
+  VDSO_SYMBOL(sigtramp_rt64) =  get_vdso_symbol ("__kernel_sigtramp_rt64");
 #else
-  VDSO_SYMBOL(sigtramp32) = _dl_vdso_vsym ("__kernel_sigtramp32", &linux2615);
-  VDSO_SYMBOL(sigtramp_rt32) = _dl_vdso_vsym ("__kernel_sigtramp_rt32",
-					      &linux2615);
+  VDSO_SYMBOL(sigtramp32) = get_vdso_symbol ("__kernel_sigtramp32");
+  VDSO_SYMBOL(sigtramp_rt32) = get_vdso_symbol ("__kernel_sigtramp_rt32");
 #endif
 }
 
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
index 75d5831018..1cbf1596d5 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
@@ -18,6 +18,7 @@
 #ifndef _LINUX_POWERPC_SYSDEP_H
 #define _LINUX_POWERPC_SYSDEP_H 1
 
+#include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/powerpc/sysdep.h>
 #include <tls.h>
@@ -144,12 +145,6 @@
     sc_ret;								      \
   })
 
-/* List of system calls which are supported as vsyscalls.  */
-# define HAVE_CLOCK_GETRES_VSYSCALL	1
-# define HAVE_CLOCK_GETTIME_VSYSCALL	1
-# define HAVE_GETCPU_VSYSCALL		1
-
-
 # define LOADARGS_0(name, dummy)					      \
 	r0 = name
 # define LOADARGS_1(name, __arg1) \
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
index e662cca4fe..fac7a9ac2e 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
@@ -20,6 +20,7 @@
 #ifndef _LINUX_POWERPC_SYSDEP_H
 #define _LINUX_POWERPC_SYSDEP_H 1
 
+#include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/powerpc/sysdep.h>
 #include <tls.h>
@@ -60,11 +61,6 @@
     sc_ret;								      \
   })
 
-/* List of system calls which are supported as vsyscalls.  */
-#define HAVE_CLOCK_GETRES_VSYSCALL	1
-#define HAVE_CLOCK_GETTIME_VSYSCALL	1
-#define HAVE_GETCPU_VSYSCALL		1
-
 /* Define a macro which expands inline into the wrapper code for a system
    call. This use is for internal calls that do not need to handle errors
    normally. It will never touch errno. This returns just what the kernel
diff --git a/sysdeps/unix/sysv/linux/powerpc/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
new file mode 100644
index 0000000000..c72c93dfa0
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
@@ -0,0 +1,25 @@
+/* Syscall definitions, Linux PowerPC generic version.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define VDSO_NAME  "LINUX_2.6.15"
+#define VDSO_HASH  123718565
+
+/* List of system calls which are supported as vsyscalls.  */
+#define HAVE_CLOCK_GETRES_VSYSCALL	1
+#define HAVE_CLOCK_GETTIME_VSYSCALL	1
+#define HAVE_GETCPU_VSYSCALL		1
diff --git a/sysdeps/unix/sysv/linux/powerpc/time.c b/sysdeps/unix/sysv/linux/powerpc/time.c
index 41092b3b98..2a0b776927 100644
--- a/sysdeps/unix/sysv/linux/powerpc/time.c
+++ b/sysdeps/unix/sysv/linux/powerpc/time.c
@@ -66,9 +66,8 @@ time_syscall (time_t *t)
   return result;
 }
 
-# define INIT_ARCH()						\
-  PREPARE_VERSION_KNOWN (linux2615, LINUX_2_6_15);		\
-  void *vdso_time = _dl_vdso_vsym ("__kernel_time", &linux2615);
+# define INIT_ARCH() \
+  void *vdso_time = get_vdso_symbol ("__kernel_time");
 
 /* If the vDSO is not available we fall back to the syscall.  */
 libc_ifunc_hidden (__redirect_time, time,