2005-04-16 16:20:36 -06:00
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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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* (C) Copyright 2005 Andi Kleen
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2008-06-24 09:05:11 -06:00
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* (C) Copyright 2008 Glauber Costa
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2005-04-16 16:20:36 -06:00
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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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2008-06-24 09:05:11 -06:00
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* Inputs: %[r|e]ax contains the address.
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*
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* Outputs: %[r|e]ax is error code (0 or -EFAULT)
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* %[r|e]dx contains zero-extended value
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* %ecx contains the high half for 32-bit __get_user_8
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*
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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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2006-09-26 02:52:32 -06:00
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#include <asm/dwarf2.h>
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#include <asm/page_types.h>
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2005-04-16 16:20:36 -06:00
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#include <asm/errno.h>
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2005-09-09 13:28:48 -06:00
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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2008-06-24 08:37:57 -06:00
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#include <asm/asm.h>
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2012-09-21 13:43:12 -06:00
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#include <asm/smap.h>
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2005-04-16 16:20:36 -06:00
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.text
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ENTRY(__get_user_1)
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CFI_STARTPROC
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2008-06-24 08:37:57 -06:00
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GET_THREAD_INFO(%_ASM_DX)
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cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
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jae bad_get_user
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ASM_STAC
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1: movzbl (%_ASM_AX),%edx
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xor %eax,%eax
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ASM_CLAC
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ret
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CFI_ENDPROC
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ENDPROC(__get_user_1)
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ENTRY(__get_user_2)
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CFI_STARTPROC
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2008-06-24 08:37:57 -06:00
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add $1,%_ASM_AX
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jc bad_get_user
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GET_THREAD_INFO(%_ASM_DX)
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cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
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jae bad_get_user
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ASM_STAC
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2: movzwl -1(%_ASM_AX),%edx
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xor %eax,%eax
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ASM_CLAC
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ret
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CFI_ENDPROC
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ENDPROC(__get_user_2)
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ENTRY(__get_user_4)
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CFI_STARTPROC
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add $3,%_ASM_AX
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jc bad_get_user
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GET_THREAD_INFO(%_ASM_DX)
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cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
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jae bad_get_user
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ASM_STAC
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3: movl -3(%_ASM_AX),%edx
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xor %eax,%eax
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ASM_CLAC
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ret
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CFI_ENDPROC
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ENDPROC(__get_user_4)
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ENTRY(__get_user_8)
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CFI_STARTPROC
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2012-12-12 04:34:03 -07:00
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#ifdef CONFIG_X86_64
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2008-06-24 08:37:57 -06:00
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add $7,%_ASM_AX
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2008-06-24 08:13:16 -06:00
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jc bad_get_user
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2008-06-24 08:37:57 -06:00
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GET_THREAD_INFO(%_ASM_DX)
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cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
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jae bad_get_user
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2012-09-21 13:43:12 -06:00
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ASM_STAC
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2013-02-12 00:14:48 -07:00
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4: movq -7(%_ASM_AX),%rdx
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xor %eax,%eax
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ASM_CLAC
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ret
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#else
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add $7,%_ASM_AX
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jc bad_get_user_8
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GET_THREAD_INFO(%_ASM_DX)
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cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
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jae bad_get_user_8
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ASM_STAC
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2013-02-12 00:14:48 -07:00
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4: movl -7(%_ASM_AX),%edx
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5: movl -3(%_ASM_AX),%ecx
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2012-12-12 04:34:03 -07:00
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xor %eax,%eax
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ASM_CLAC
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ret
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#endif
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CFI_ENDPROC
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ENDPROC(__get_user_8)
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bad_get_user:
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CFI_STARTPROC
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xor %edx,%edx
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mov $(-EFAULT),%_ASM_AX
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ASM_CLAC
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ret
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CFI_ENDPROC
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END(bad_get_user)
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2012-12-12 04:34:03 -07:00
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#ifdef CONFIG_X86_32
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bad_get_user_8:
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CFI_STARTPROC
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xor %edx,%edx
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xor %ecx,%ecx
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mov $(-EFAULT),%_ASM_AX
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ASM_CLAC
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ret
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CFI_ENDPROC
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END(bad_get_user_8)
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#endif
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2012-04-20 13:19:51 -06:00
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_ASM_EXTABLE(1b,bad_get_user)
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_ASM_EXTABLE(2b,bad_get_user)
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_ASM_EXTABLE(3b,bad_get_user)
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#ifdef CONFIG_X86_64
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_ASM_EXTABLE(4b,bad_get_user)
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#else
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_ASM_EXTABLE(4b,bad_get_user_8)
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_ASM_EXTABLE(5b,bad_get_user_8)
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2008-06-24 09:05:11 -06:00
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#endif
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