linux/arch/arm/lib/putuser.S
Russell King 4260415f6a ARM: fix build error in arch/arm/kernel/process.c
/tmp/ccJ3ssZW.s: Assembler messages:
/tmp/ccJ3ssZW.s:1952: Error: can't resolve `.text' {.text section} - `.LFB1077'

This is caused because:

	.section .data
	.section .text
	.section .text
	.previous

does not return us to the .text section, but the .data section; this
makes use of .previous dangerous if the ordering of previous sections
is not known.

Fix up the other users of .previous; .pushsection and .popsection are
a safer pairing to use than .section and .previous.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-04-21 08:45:21 +01:00

92 lines
1.9 KiB
ArmAsm

/*
* linux/arch/arm/lib/putuser.S
*
* Copyright (C) 2001 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Idea from x86 version, (C) Copyright 1998 Linus Torvalds
*
* 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: r0 contains the address
* r2, r3 contains the value
* Outputs: r0 is the error code
* lr corrupted
*
* No other registers must be altered. (see <asm/uaccess.h>
* for specific ASM register usage).
*
* Note that ADDR_LIMIT is either 0 or 0xc0000000
* Note also that it is intended that __put_user_bad is not global.
*/
#include <linux/linkage.h>
#include <asm/errno.h>
ENTRY(__put_user_1)
1: strbt r2, [r0]
mov r0, #0
mov pc, lr
ENDPROC(__put_user_1)
ENTRY(__put_user_2)
mov ip, r2, lsr #8
#ifdef CONFIG_THUMB2_KERNEL
#ifndef __ARMEB__
2: strbt r2, [r0]
3: strbt ip, [r0, #1]
#else
2: strbt ip, [r0]
3: strbt r2, [r0, #1]
#endif
#else /* !CONFIG_THUMB2_KERNEL */
#ifndef __ARMEB__
2: strbt r2, [r0], #1
3: strbt ip, [r0]
#else
2: strbt ip, [r0], #1
3: strbt r2, [r0]
#endif
#endif /* CONFIG_THUMB2_KERNEL */
mov r0, #0
mov pc, lr
ENDPROC(__put_user_2)
ENTRY(__put_user_4)
4: strt r2, [r0]
mov r0, #0
mov pc, lr
ENDPROC(__put_user_4)
ENTRY(__put_user_8)
#ifdef CONFIG_THUMB2_KERNEL
5: strt r2, [r0]
6: strt r3, [r0, #4]
#else
5: strt r2, [r0], #4
6: strt r3, [r0]
#endif
mov r0, #0
mov pc, lr
ENDPROC(__put_user_8)
__put_user_bad:
mov r0, #-EFAULT
mov pc, lr
ENDPROC(__put_user_bad)
.pushsection __ex_table, "a"
.long 1b, __put_user_bad
.long 2b, __put_user_bad
.long 3b, __put_user_bad
.long 4b, __put_user_bad
.long 5b, __put_user_bad
.long 6b, __put_user_bad
.popsection