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90 lines
1.6 KiB
ArmAsm
90 lines
1.6 KiB
ArmAsm
/*
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* __get_user functions.
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*
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* (C) Copyright 1998 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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/*
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* __get_user_X
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*
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* Inputs: %rax contains the address
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*
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* Outputs: %rax is error code (0 or -EFAULT)
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* %rdx contains zero-extended value
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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/page.h>
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#include <asm/errno.h>
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#include <asm/offset.h>
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#include <asm/thread_info.h>
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.text
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.p2align 4
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.globl __get_user_1
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__get_user_1:
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GET_THREAD_INFO(%rbx)
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cmpq threadinfo_addr_limit(%rbx),%rax
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jae bad_get_user
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1: movzb (%rax),%edx
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xorq %rax,%rax
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ret
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.p2align 4
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.globl __get_user_2
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__get_user_2:
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GET_THREAD_INFO(%rbx)
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addq $1,%rax
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jc bad_get_user
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cmpq threadinfo_addr_limit(%rbx),%rax
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jae bad_get_user
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2: movzwl -1(%rax),%edx
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xorq %rax,%rax
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ret
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.p2align 4
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.globl __get_user_4
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__get_user_4:
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GET_THREAD_INFO(%rbx)
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addq $3,%rax
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jc bad_get_user
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cmpq threadinfo_addr_limit(%rbx),%rax
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jae bad_get_user
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3: movl -3(%rax),%edx
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xorq %rax,%rax
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ret
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.p2align 4
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.globl __get_user_8
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__get_user_8:
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GET_THREAD_INFO(%rbx)
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addq $7,%rax
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jc bad_get_user
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cmpq threadinfo_addr_limit(%rbx),%rax
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jae bad_get_user
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4: movq -7(%rax),%rdx
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xorq %rax,%rax
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ret
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ENTRY(bad_get_user)
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bad_get_user:
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xorq %rdx,%rdx
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movq $(-EFAULT),%rax
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ret
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.section __ex_table,"a"
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.quad 1b,bad_get_user
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.quad 2b,bad_get_user
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.quad 3b,bad_get_user
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.quad 4b,bad_get_user
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.previous
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