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Diffstat (limited to 'arch/arm/lib/putuser.S')
-rw-r--r-- | arch/arm/lib/putuser.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/arm/lib/putuser.S b/arch/arm/lib/putuser.S new file mode 100644 index 000000000000..b09398d95aac --- /dev/null +++ b/arch/arm/lib/putuser.S @@ -0,0 +1,76 @@ +/* + * 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 include/asm-arm/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 <asm/constants.h> +#include <asm/thread_info.h> +#include <asm/errno.h> + + .global __put_user_1 +__put_user_1: +1: strbt r2, [r0] + mov r0, #0 + mov pc, lr + + .global __put_user_2 +__put_user_2: + mov ip, r2, lsr #8 +#ifndef __ARMEB__ +2: strbt r2, [r0], #1 +3: strbt ip, [r0] +#else +2: strbt ip, [r0], #1 +3: strbt r2, [r0] +#endif + mov r0, #0 + mov pc, lr + + .global __put_user_4 +__put_user_4: +4: strt r2, [r0] + mov r0, #0 + mov pc, lr + + .global __put_user_8 +__put_user_8: +5: strt r2, [r0], #4 +6: strt r3, [r0] + mov r0, #0 + mov pc, lr + +__put_user_bad: + mov r0, #-EFAULT + mov pc, lr + +.section __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 +.previous |