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2528de431d
In putuser_32.S and putuser_64.S, replace things like .quad, .long, and explicit references to [r|e]ax for the apropriate macros in asm/asm.h. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
95 lines
1.8 KiB
ArmAsm
95 lines
1.8 KiB
ArmAsm
/*
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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 2005 Andi Kleen
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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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/*
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* __put_user_X
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*
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* Inputs: %rcx contains the address
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* %rdx contains new value
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*
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* Outputs: %rax is error code (0 or -EFAULT)
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*
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* %rbx is destroyed.
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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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#include <linux/linkage.h>
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#include <asm/dwarf2.h>
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#include <asm/page.h>
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#include <asm/errno.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/asm.h>
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#define ENTER CFI_STARTPROC ; \
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GET_THREAD_INFO(%_ASM_BX)
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#define EXIT ret ; \
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CFI_ENDPROC
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.text
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ENTRY(__put_user_1)
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ENTER
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cmp TI_addr_limit(%_ASM_BX),%_ASM_CX
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jae bad_put_user
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1: movb %al,(%_ASM_CX)
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xor %eax,%eax
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EXIT
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ENDPROC(__put_user_1)
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ENTRY(__put_user_2)
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ENTER
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mov TI_addr_limit(%_ASM_BX),%_ASM_BX
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sub $1, %_ASM_BX
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cmp %_ASM_BX ,%_ASM_CX
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jae bad_put_user
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2: movw %ax,(%_ASM_CX)
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xor %eax,%eax
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EXIT
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ENDPROC(__put_user_2)
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ENTRY(__put_user_4)
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ENTER
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mov TI_addr_limit(%_ASM_BX),%_ASM_BX
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sub $3, %_ASM_BX
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cmp %_ASM_BX, %_ASM_CX
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jae bad_put_user
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3: movl %eax,(%_ASM_CX)
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xor %eax,%eax
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EXIT
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ENDPROC(__put_user_4)
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ENTRY(__put_user_8)
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ENTER
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mov TI_addr_limit(%_ASM_BX),%_ASM_BX
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sub $7, %_ASM_BX
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cmp %_ASM_BX, %_ASM_CX
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jae bad_put_user
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4: movq %_ASM_AX,(%_ASM_CX)
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xor %eax,%eax
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EXIT
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ENDPROC(__put_user_8)
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bad_put_user:
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CFI_STARTPROC
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mov $(-EFAULT),%eax
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EXIT
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END(bad_put_user)
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.section __ex_table,"a"
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_ASM_PTR 1b,bad_put_user
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_ASM_PTR 2b,bad_put_user
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_ASM_PTR 3b,bad_put_user
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_ASM_PTR 4b,bad_put_user
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.previous
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