From 19dd090a0f68765db87990ef8eda9bf77bb29581 Mon Sep 17 00:00:00 2001
From: Henning Heinold <heinold@inf.fu-berlin.de>
Date: Sat, 4 Jun 2011 21:21:41 +0200
Subject: libc: flesh out linux scheduler functions

Most stuff was taken from the eglibc.

Signed-off-by: Henning Heinold <heinold@inf.fu-berlin.de>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
---
 libc/sysdeps/linux/x86_64/Makefile.arch  |  7 ++++
 libc/sysdeps/linux/x86_64/sched_getcpu.S | 72 ++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 libc/sysdeps/linux/x86_64/sched_getcpu.S

(limited to 'libc/sysdeps/linux/x86_64')

diff --git a/libc/sysdeps/linux/x86_64/Makefile.arch b/libc/sysdeps/linux/x86_64/Makefile.arch
index de7ce7285..0d14650ff 100644
--- a/libc/sysdeps/linux/x86_64/Makefile.arch
+++ b/libc/sysdeps/linux/x86_64/Makefile.arch
@@ -17,3 +17,10 @@ SSRC := \
 ifneq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 SSRC += vfork.S clone.S
 endif
+
+ifeq ($(UCLIBC_LINUX_SPECIFIC),y)
+ARCH_OBJ_FILTEROUT = sched_getcpu.c
+ifeq ($(UCLIBC_HAS_TLS),y)
+SSRC += sched_getcpu.S
+endif
+endif
diff --git a/libc/sysdeps/linux/x86_64/sched_getcpu.S b/libc/sysdeps/linux/x86_64/sched_getcpu.S
new file mode 100644
index 000000000..592bcdbdf
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/sched_getcpu.S
@@ -0,0 +1,72 @@
+/* Copyright (C) 2007, 2011 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#include <tls.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+#include <bits/kernel-features.h>
+
+/* For the calculation see asm/vsyscall.h.  */
+#define VSYSCALL_ADDR_vgetcpu	0xffffffffff600800
+
+
+ENTRY (sched_getcpu)
+	/* Align stack and create local variable for result.  */
+	sub	$0x8, %rsp
+	cfi_adjust_cfa_offset(8)
+
+	movq	%rsp, %rdi
+	xorl	%esi, %esi
+	movl	$VGETCPU_CACHE_OFFSET, %edx
+	addq	%fs:0, %rdx
+
+#ifdef SHARED
+	movq	__vdso_getcpu(%rip), %rax
+	PTR_DEMANGLE (%rax)
+	callq	*%rax
+#else
+# ifdef __NR_getcpu
+	movl	$__NR_getcpu, %eax
+	syscall
+#  ifndef __ASSUME_GETCPU_SYSCALL
+	cmpq	$-ENOSYS, %rax
+	jne	1f
+#  endif
+# endif
+# ifndef __ASSUME_GETCPU_SYSCALL
+	movq	$VSYSCALL_ADDR_vgetcpu, %rax
+	callq	*%rax
+1:
+# else
+#  ifndef __NR_getcpu
+#   error "cannot happen"
+#  endif
+# endif
+#endif
+
+	cmpq	$-4095, %rax
+	jae	SYSCALL_ERROR_LABEL
+
+	movl	(%rsp), %eax
+
+L(pseudo_end):
+	add	$0x8, %rsp
+	cfi_adjust_cfa_offset(-8)
+	ret
+PSEUDO_END(sched_getcpu)
-- 
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