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| author |   Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
|---|---|---|
| committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
| commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
| tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm/lib/putuser.S | |
| parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) | |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm/lib/putuser.S')
| -rw-r--r-- | kernel/arch/arm/lib/putuser.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/kernel/arch/arm/lib/putuser.S b/kernel/arch/arm/lib/putuser.S new file mode 100644 index 000000000..38d660d37 --- /dev/null +++ b/kernel/arch/arm/lib/putuser.S @@ -0,0 +1,98 @@ +/* + * 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 + * r1 contains the address limit, which must be preserved + * 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/assembler.h> +#include <asm/errno.h> +#include <asm/domain.h> + +ENTRY(__put_user_1) + check_uaccess r0, 1, r1, ip, __put_user_bad +1: TUSER(strb) r2, [r0] + mov r0, #0 + ret lr +ENDPROC(__put_user_1) + +ENTRY(__put_user_2) + check_uaccess r0, 2, r1, ip, __put_user_bad + mov ip, r2, lsr #8 +#ifdef CONFIG_THUMB2_KERNEL +#ifndef __ARMEB__ +2: TUSER(strb) r2, [r0] +3: TUSER(strb) ip, [r0, #1] +#else +2: TUSER(strb) ip, [r0] +3: TUSER(strb) r2, [r0, #1] +#endif +#else /* !CONFIG_THUMB2_KERNEL */ +#ifndef __ARMEB__ +2: TUSER(strb) r2, [r0], #1 +3: TUSER(strb) ip, [r0] +#else +2: TUSER(strb) ip, [r0], #1 +3: TUSER(strb) r2, [r0] +#endif +#endif /* CONFIG_THUMB2_KERNEL */ + mov r0, #0 + ret lr +ENDPROC(__put_user_2) + +ENTRY(__put_user_4) + check_uaccess r0, 4, r1, ip, __put_user_bad +4: TUSER(str) r2, [r0] + mov r0, #0 + ret lr +ENDPROC(__put_user_4) + +ENTRY(__put_user_8) + check_uaccess r0, 8, r1, ip, __put_user_bad +#ifdef CONFIG_THUMB2_KERNEL +5: TUSER(str) r2, [r0] +6: TUSER(str) r3, [r0, #4] +#else +5: TUSER(str) r2, [r0], #4 +6: TUSER(str) r3, [r0] +#endif + mov r0, #0 + ret lr +ENDPROC(__put_user_8) + +__put_user_bad: + mov r0, #-EFAULT + ret 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 |