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-rw-r--r--arch/arm26/lib/getuser.S112
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diff --git a/arch/arm26/lib/getuser.S b/arch/arm26/lib/getuser.S
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-/*
- * linux/arch/arm26/lib/getuser.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.
- *
- * __get_user_X
- *
- * Inputs: r0 contains the address
- * Outputs: r0 is the error code
- * r1, r2 contains the zero-extended value
- * 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 __get_user_bad is not global.
- */
-#include <asm/asm-offsets.h>
-#include <asm/thread_info.h>
-#include <asm/errno.h>
-
- .global __get_user_1
-__get_user_1:
- bic r1, sp, #0x1f00
- bic r1, r1, #0x00ff
- str lr, [sp, #-4]!
- ldr r1, [r1, #TI_ADDR_LIMIT]
- sub r1, r1, #1
- cmp r0, r1
- bge __get_user_bad
- cmp r0, #0x02000000
-1: ldrlsbt r1, [r0]
- ldrgeb r1, [r0]
- mov r0, #0
- ldmfd sp!, {pc}^
-
- .global __get_user_2
-__get_user_2:
- bic r2, sp, #0x1f00
- bic r2, r2, #0x00ff
- str lr, [sp, #-4]!
- ldr r2, [r2, #TI_ADDR_LIMIT]
- sub r2, r2, #2
- cmp r0, r2
- bge __get_user_bad
- cmp r0, #0x02000000
-2: ldrlsbt r1, [r0], #1
-3: ldrlsbt r2, [r0]
- ldrgeb r1, [r0], #1
- ldrgeb r2, [r0]
- orr r1, r1, r2, lsl #8
- mov r0, #0
- ldmfd sp!, {pc}^
-
- .global __get_user_4
-__get_user_4:
- bic r1, sp, #0x1f00
- bic r1, r1, #0x00ff
- str lr, [sp, #-4]!
- ldr r1, [r1, #TI_ADDR_LIMIT]
- sub r1, r1, #4
- cmp r0, r1
- bge __get_user_bad
- cmp r0, #0x02000000
-4: ldrlst r1, [r0]
- ldrge r1, [r0]
- mov r0, #0
- ldmfd sp!, {pc}^
-
- .global __get_user_8
-__get_user_8:
- bic r2, sp, #0x1f00
- bic r2, r2, #0x00ff
- str lr, [sp, #-4]!
- ldr r2, [r2, #TI_ADDR_LIMIT]
- sub r2, r2, #8
- cmp r0, r2
- bge __get_user_bad_8
- cmp r0, #0x02000000
-5: ldrlst r1, [r0], #4
-6: ldrlst r2, [r0]
- ldrge r1, [r0], #4
- ldrge r2, [r0]
- mov r0, #0
- ldmfd sp!, {pc}^
-
-__get_user_bad_8:
- mov r2, #0
-__get_user_bad:
- mov r1, #0
- mov r0, #-EFAULT
- ldmfd sp!, {pc}^
-
-.section __ex_table, "a"
- .long 1b, __get_user_bad
- .long 2b, __get_user_bad
- .long 3b, __get_user_bad
- .long 4b, __get_user_bad
- .long 5b, __get_user_bad_8
- .long 6b, __get_user_bad_8
-.previous