PATCH: Add x32 getcpu and sched_getcpu

["H.J. Lu" <hongjiu dot lu at intel dot com>]

Hi,

Since x32 kernel has __vdso_getcpu from the very beginning, this
patch implements x32 getcpu with ifunc.  The shared sched_getcpu just
calls __getcpu and the static sched_getcpu uses the generic Linux
version.  Tested on Linux/x32.  OK to install?

Thanks.

H.J.
--

	* sysdeps/unix/sysv/linux/x86_64/x32/Makefile: New file.
	* sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu-static.c:
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu.S: Likewise.

diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/Makefile b/sysdeps/unix/sysv/linux/x86_64/x32/Makefile
new file mode 100644
index 0000000..5f77df7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/Makefile
@@ -0,0 +1,3 @@
+ifeq ($(subdir),posix)
+sysdep_routines += getcpu sched_getcpu-static
+endif
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c b/sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c
new file mode 100644
index 0000000..b01840e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c
@@ -0,0 +1,31 @@
+/* Copyright (C) 2012 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/>.  */
+
+#ifdef SHARED
+# include <dl-vdso.h>
+
+void *getcpu_ifunc (void) __asm__ ("__getcpu");
+
+void *
+getcpu_ifunc (void)
+{
+  PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
+
+  return _dl_vdso_vsym ("__vdso_getcpu", &linux26);
+}
+__asm (".type __getcpu, %gnu_indirect_function");
+#endif
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu-static.c b/sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu-static.c
new file mode 100644
index 0000000..38bbf9a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu-static.c
@@ -0,0 +1,3 @@
+#ifndef SHARED
+#include "../../sched_getcpu.c"
+#endif
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu.S b/sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu.S
new file mode 100644
index 0000000..f3ba9f1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu.S
@@ -0,0 +1,46 @@
+/* Copyright (C) 2012 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/>.  */
+
+#ifdef SHARED
+#include <sysdep.h>
+#include <tls.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+ENTRY (sched_getcpu)
+	/* Align stack and create local variable for result.  */
+	sub	$0x8, %esp
+	cfi_adjust_cfa_offset(8)
+
+	mov	%esp, %edi
+	xor	%esi, %esi
+	mov	$VGETCPU_CACHE_OFFSET, %edx
+	add	%fs:0, %edx
+
+	call	__getcpu
+
+	cmp	$-4095, %eax
+	jae	SYSCALL_ERROR_LABEL
+
+	mov	(%rsp), %eax
+
+L(pseudo_end):
+	add	$0x8, %esp
+	cfi_adjust_cfa_offset(-8)
+	ret
+PSEUDO_END(sched_getcpu)
+#endif