putuser.S
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上传日期:2013-04-10
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- /*
- * 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, r2 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>
- .global __put_user_1
- __put_user_1:
- bic r2, sp, #0x1f00
- bic r2, r2, #0x00ff
- ldr r2, [r2, #TSK_ADDR_LIMIT]
- sub r2, r2, #1
- cmp r0, r2
- 1: strlsbt r1, [r0]
- movls r0, #0
- movls pc, lr
- b __put_user_bad
- .global __put_user_2
- __put_user_2:
- bic r2, sp, #0x1f00
- bic r2, r2, #0x00ff
- ldr r2, [r2, #TSK_ADDR_LIMIT]
- sub r2, r2, #2
- cmp r0, r2
- 2: strlsbt r1, [r0], #1
- movls r1, r1, lsr #8
- 3: strlsbt r1, [r0]
- movls r0, #0
- movls pc, lr
- b __put_user_bad
- .global __put_user_4
- __put_user_4:
- bic r2, sp, #0x1f00
- bic r2, r2, #0x00ff
- ldr r2, [r2, #TSK_ADDR_LIMIT]
- sub r2, r2, #4
- cmp r0, r2
- 4: strlst r1, [r0]
- movls r0, #0
- movls pc, lr
- b __put_user_bad
- .global __put_user_8
- __put_user_8:
- bic ip, sp, #0x1f00
- bic ip, ip, #0x00ff
- ldr ip, [ip, #TSK_ADDR_LIMIT]
- sub ip, ip, #8
- cmp r0, ip
- 5: strlst r1, [r0], #4
- 6: strlst r2, [r0]
- movls r0, #0
- movls pc, lr
- /* fall through */
- __put_user_bad:
- mov r0, #-14
- 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