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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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71 lines
1.2 KiB
ArmAsm
71 lines
1.2 KiB
ArmAsm
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/*
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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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#include <asm/thread_info.h>
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/*
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* __get_user_X
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*
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* Inputs: %eax contains the address
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*
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* Outputs: %eax is error code (0 or -EFAULT)
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* %edx 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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.text
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.align 4
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.globl __get_user_1
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__get_user_1:
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GET_THREAD_INFO(%edx)
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cmpl TI_addr_limit(%edx),%eax
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jae bad_get_user
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1: movzbl (%eax),%edx
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xorl %eax,%eax
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ret
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.align 4
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.globl __get_user_2
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__get_user_2:
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addl $1,%eax
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jc bad_get_user
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GET_THREAD_INFO(%edx)
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cmpl TI_addr_limit(%edx),%eax
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jae bad_get_user
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2: movzwl -1(%eax),%edx
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xorl %eax,%eax
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ret
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.align 4
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.globl __get_user_4
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__get_user_4:
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addl $3,%eax
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jc bad_get_user
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GET_THREAD_INFO(%edx)
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cmpl TI_addr_limit(%edx),%eax
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jae bad_get_user
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3: movl -3(%eax),%edx
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xorl %eax,%eax
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ret
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bad_get_user:
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xorl %edx,%edx
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movl $-14,%eax
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ret
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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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