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88 lines
1.5 KiB
88 lines
1.5 KiB
20 years ago
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/*
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* __put_user functions.
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*
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* (C) Copyright 2005 Linus Torvalds
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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 <asm/thread_info.h>
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/*
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* __put_user_X
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*
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* Inputs: %eax[:%edx] contains the data
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* %ecx contains the address
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*
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* Outputs: %eax is error code (0 or -EFAULT)
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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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#define ENTER pushl %ebx ; GET_THREAD_INFO(%ebx)
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#define EXIT popl %ebx ; ret
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.text
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.align 4
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.globl __put_user_1
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__put_user_1:
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ENTER
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cmpl TI_addr_limit(%ebx),%ecx
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jae bad_put_user
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1: movb %al,(%ecx)
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xorl %eax,%eax
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EXIT
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.align 4
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.globl __put_user_2
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__put_user_2:
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ENTER
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movl TI_addr_limit(%ebx),%ebx
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subl $1,%ebx
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cmpl %ebx,%ecx
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jae bad_put_user
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2: movw %ax,(%ecx)
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xorl %eax,%eax
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EXIT
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.align 4
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.globl __put_user_4
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__put_user_4:
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ENTER
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movl TI_addr_limit(%ebx),%ebx
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subl $3,%ebx
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cmpl %ebx,%ecx
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jae bad_put_user
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3: movl %eax,(%ecx)
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xorl %eax,%eax
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EXIT
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.align 4
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.globl __put_user_8
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__put_user_8:
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ENTER
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movl TI_addr_limit(%ebx),%ebx
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subl $7,%ebx
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cmpl %ebx,%ecx
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jae bad_put_user
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4: movl %eax,(%ecx)
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5: movl %edx,4(%ecx)
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xorl %eax,%eax
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EXIT
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bad_put_user:
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movl $-14,%eax
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EXIT
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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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.long 4b,bad_put_user
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.long 5b,bad_put_user
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.previous
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