From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 arch/x86_64/lib/putuser.S | 89 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 arch/x86_64/lib/putuser.S

(limited to 'arch/x86_64/lib/putuser.S')

diff --git a/arch/x86_64/lib/putuser.S b/arch/x86_64/lib/putuser.S
new file mode 100644
index 000000000000..0dee1fdcb162
--- /dev/null
+++ b/arch/x86_64/lib/putuser.S
@@ -0,0 +1,89 @@
+/*
+ * __put_user functions.
+ *
+ * (C) Copyright 1998 Linus Torvalds
+ * (C) Copyright 2005 Andi Kleen
+ *
+ * These functions have a non-standard call interface
+ * to make them more efficient, especially as they
+ * return an error value in addition to the "real"
+ * return value.
+ */
+
+/*
+ * __put_user_X
+ *
+ * Inputs:	%rcx contains the address
+ *		%rdx contains new value
+ *
+ * Outputs:	%rax is error code (0 or -EFAULT)
+ *
+ * %r8 is destroyed.
+ *
+ * These functions should not modify any other registers,
+ * as they get called from within inline assembly.
+ */
+
+#include <linux/linkage.h>
+#include <asm/page.h>
+#include <asm/errno.h>
+#include <asm/offset.h>
+#include <asm/thread_info.h>
+
+	.text
+	.p2align 4
+.globl __put_user_1
+__put_user_1:
+	GET_THREAD_INFO(%r8)
+	cmpq threadinfo_addr_limit(%r8),%rcx
+	jae bad_put_user
+1:	movb %dl,(%rcx)
+	xorl %eax,%eax
+	ret
+
+	.p2align 4
+.globl __put_user_2
+__put_user_2:
+	GET_THREAD_INFO(%r8)
+	addq $1,%rcx
+	jc bad_put_user
+	cmpq threadinfo_addr_limit(%r8),%rcx
+	jae	 bad_put_user
+2:	movw %dx,-1(%rcx)
+	xorl %eax,%eax
+	ret
+
+	.p2align 4
+.globl __put_user_4
+__put_user_4:
+	GET_THREAD_INFO(%r8)
+	addq $3,%rcx
+	jc bad_put_user
+	cmpq threadinfo_addr_limit(%r8),%rcx
+	jae bad_put_user
+3:	movl %edx,-3(%rcx)
+	xorl %eax,%eax
+	ret
+
+	.p2align 4
+.globl __put_user_8
+__put_user_8:
+	GET_THREAD_INFO(%r8)
+	addq $7,%rcx
+	jc bad_put_user
+	cmpq threadinfo_addr_limit(%r8),%rcx
+	jae	bad_put_user
+4:	movq %rdx,-7(%rcx)
+	xorl %eax,%eax
+	ret
+
+bad_put_user:
+	movq $(-EFAULT),%rax
+	ret
+
+.section __ex_table,"a"
+	.quad 1b,bad_put_user
+	.quad 2b,bad_put_user
+	.quad 3b,bad_put_user
+	.quad 4b,bad_put_user
+.previous
-- 
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