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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 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
- #if __LINUX_ARM_ARCH__ >= 6
- 2: TUSER(strh) r2, [r0]
- #else
- mov ip, r2, lsr #8
- #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 /* __LINUX_ARM_ARCH__ >= 6 */
- 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
- #if __LINUX_ARM_ARCH__ < 6
- .long 3b, __put_user_bad
- #endif
- .long 4b, __put_user_bad
- .long 5b, __put_user_bad
- .long 6b, __put_user_bad
- .popsection
|
