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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 @@ | |||
| 1 | /* | ||
| 2 | * linux/arch/arm/lib/putuser.S | ||
| 3 | * | ||
| 4 | * Copyright (C) 2001 Russell King | ||
| 5 | * | ||
| 6 | * This program is free software; you can redistribute it and/or modify | ||
| 7 | * it under the terms of the GNU General Public License version 2 as | ||
| 8 | * published by the Free Software Foundation. | ||
| 9 | * | ||
| 10 | * Idea from x86 version, (C) Copyright 1998 Linus Torvalds | ||
| 11 | * | ||
| 12 | * These functions have a non-standard call interface to make | ||
| 13 | * them more efficient, especially as they return an error | ||
| 14 | * value in addition to the "real" return value. | ||
| 15 | * | ||
| 16 | * __put_user_X | ||
| 17 | * | ||
| 18 | * Inputs: r0 contains the address | ||
| 19 | * r2, r3 contains the value | ||
| 20 | * Outputs: r0 is the error code | ||
| 21 | * lr corrupted | ||
| 22 | * | ||
| 23 | * No other registers must be altered. (see include/asm-arm/uaccess.h | ||
| 24 | * for specific ASM register usage). | ||
| 25 | * | ||
| 26 | * Note that ADDR_LIMIT is either 0 or 0xc0000000 | ||
| 27 | * Note also that it is intended that __put_user_bad is not global. | ||
| 28 | */ | ||
| 29 | #include <asm/constants.h> | ||
| 30 | #include <asm/thread_info.h> | ||
| 31 | #include <asm/errno.h> | ||
| 32 | |||
| 33 | .global __put_user_1 | ||
| 34 | __put_user_1: | ||
| 35 | 1: strbt r2, [r0] | ||
| 36 | mov r0, #0 | ||
| 37 | mov pc, lr | ||
| 38 | |||
| 39 | .global __put_user_2 | ||
| 40 | __put_user_2: | ||
| 41 | mov ip, r2, lsr #8 | ||
| 42 | #ifndef __ARMEB__ | ||
| 43 | 2: strbt r2, [r0], #1 | ||
| 44 | 3: strbt ip, [r0] | ||
| 45 | #else | ||
| 46 | 2: strbt ip, [r0], #1 | ||
| 47 | 3: strbt r2, [r0] | ||
| 48 | #endif | ||
| 49 | mov r0, #0 | ||
| 50 | mov pc, lr | ||
| 51 | |||
| 52 | .global __put_user_4 | ||
| 53 | __put_user_4: | ||
| 54 | 4: strt r2, [r0] | ||
| 55 | mov r0, #0 | ||
| 56 | mov pc, lr | ||
| 57 | |||
| 58 | .global __put_user_8 | ||
| 59 | __put_user_8: | ||
| 60 | 5: strt r2, [r0], #4 | ||
| 61 | 6: strt r3, [r0] | ||
| 62 | mov r0, #0 | ||
| 63 | mov pc, lr | ||
| 64 | |||
| 65 | __put_user_bad: | ||
| 66 | mov r0, #-EFAULT | ||
| 67 | mov pc, lr | ||
| 68 | |||
| 69 | .section __ex_table, "a" | ||
| 70 | .long 1b, __put_user_bad | ||
| 71 | .long 2b, __put_user_bad | ||
| 72 | .long 3b, __put_user_bad | ||
| 73 | .long 4b, __put_user_bad | ||
| 74 | .long 5b, __put_user_bad | ||
| 75 | .long 6b, __put_user_bad | ||
| 76 | .previous | ||