85 lines
1.3 KiB
ArmAsm
85 lines
1.3 KiB
ArmAsm
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/*
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* __put_user functions.
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*
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* (C) Copyright 1998 Linus Torvalds
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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.
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*/
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#include <linux/config.h>
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/*
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* __put_user_X
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*
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* Inputs: r0 contains the address
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* r1 contains the value
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*
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* Outputs: r0 is error code (0 or -EFAULT)
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* r1 is corrupted (will contain "current_task").
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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 __put_user_1
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__put_user_1:
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1: stb r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __put_user_2
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__put_user_2:
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2: sth r1, @r0 || ldi r0, #0
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jmp r14
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.balign 4
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.globl __put_user_4
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__put_user_4:
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3: st r1, @r0 || ldi r0, #0
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jmp r14
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bad_put_user:
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ldi r0, #-14 || 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 __put_user_1
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__put_user_1:
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1: stb 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 __put_user_2
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__put_user_2:
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2: sth 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 __put_user_4
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__put_user_4:
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3: st r1, @r0
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ldi r0, #0
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jmp r14
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bad_put_user:
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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_put_user
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.long 2b,bad_put_user
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.long 3b,bad_put_user
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.previous
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