ia64/linux-2.6.18-xen.hg

view arch/i386/lib/getuser.S @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /*
2 * __get_user functions.
3 *
4 * (C) Copyright 1998 Linus Torvalds
5 *
6 * These functions have a non-standard call interface
7 * to make them more efficient, especially as they
8 * return an error value in addition to the "real"
9 * return value.
10 */
11 #include <asm/thread_info.h>
14 /*
15 * __get_user_X
16 *
17 * Inputs: %eax contains the address
18 *
19 * Outputs: %eax is error code (0 or -EFAULT)
20 * %edx contains zero-extended value
21 *
22 * These functions should not modify any other registers,
23 * as they get called from within inline assembly.
24 */
26 .text
27 .align 4
28 .globl __get_user_1
29 __get_user_1:
30 GET_THREAD_INFO(%edx)
31 cmpl TI_addr_limit(%edx),%eax
32 jae bad_get_user
33 1: movzbl (%eax),%edx
34 xorl %eax,%eax
35 ret
37 .align 4
38 .globl __get_user_2
39 __get_user_2:
40 addl $1,%eax
41 jc bad_get_user
42 GET_THREAD_INFO(%edx)
43 cmpl TI_addr_limit(%edx),%eax
44 jae bad_get_user
45 2: movzwl -1(%eax),%edx
46 xorl %eax,%eax
47 ret
49 .align 4
50 .globl __get_user_4
51 __get_user_4:
52 addl $3,%eax
53 jc bad_get_user
54 GET_THREAD_INFO(%edx)
55 cmpl TI_addr_limit(%edx),%eax
56 jae bad_get_user
57 3: movl -3(%eax),%edx
58 xorl %eax,%eax
59 ret
61 bad_get_user:
62 xorl %edx,%edx
63 movl $-14,%eax
64 ret
66 .section __ex_table,"a"
67 .long 1b,bad_get_user
68 .long 2b,bad_get_user
69 .long 3b,bad_get_user
70 .previous