89 lines
1.4 KiB
ArmAsm
89 lines
1.4 KiB
ArmAsm
/*
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* __get_user functions.
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*
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* (C) Copyright 2001 Hirokazu Takata
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*
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* These functions have a non-standard call interface
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* to make them more efficient, especially as they
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* return an error value in addition to the "real"
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* return value.
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*/
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#include <linux/config.h>
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/*
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* __get_user_X
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*
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* Inputs: r0 contains the address
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*
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* Outputs: r0 is error code (0 or -EFAULT)
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* r1 contains zero-extended value
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*
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* These functions should not modify any other registers,
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* as they get called from within inline assembly.
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*/
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#ifdef CONFIG_ISA_DUAL_ISSUE
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.text
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.balign 4
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.globl __get_user_1
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__get_user_1:
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1: ldub r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_2
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__get_user_2:
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2: lduh r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_4
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__get_user_4:
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3: ld r1, @r0 || ldi r0, #0
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jmp r14
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bad_get_user:
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ldi r1, #0 || ldi r0, #-14
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jmp r14
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#else /* not CONFIG_ISA_DUAL_ISSUE */
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.text
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.balign 4
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.globl __get_user_1
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__get_user_1:
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1: ldub r1, @r0
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ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_2
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__get_user_2:
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2: lduh r1, @r0
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ldi r0, #0
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jmp r14
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.balign 4
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.globl __get_user_4
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__get_user_4:
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3: ld r1, @r0
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ldi r0, #0
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jmp r14
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bad_get_user:
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ldi r1, #0
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ldi r0, #-14
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jmp r14
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#endif /* not CONFIG_ISA_DUAL_ISSUE */
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.section __ex_table,"a"
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.long 1b,bad_get_user
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.long 2b,bad_get_user
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.long 3b,bad_get_user
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.previous
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.end
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