13d4ea097d
struct thread_info is a legacy mess. To prepare for its partial removal, move thread_info::addr_limit out. As an added benefit, this way is simpler. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/15bee834d09402b47ac86f2feccdf6529f9bc5b0.1468527351.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
128 lines
2.4 KiB
ArmAsm
128 lines
2.4 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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* (C) Copyright 2005 Andi Kleen
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* (C) Copyright 2008 Glauber Costa
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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: %[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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#include <asm/page_types.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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#include <asm/smap.h>
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.text
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ENTRY(__get_user_1)
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mov PER_CPU_VAR(current_task), %_ASM_DX
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cmp TASK_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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ENDPROC(__get_user_1)
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ENTRY(__get_user_2)
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add $1,%_ASM_AX
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jc bad_get_user
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mov PER_CPU_VAR(current_task), %_ASM_DX
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cmp TASK_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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ENDPROC(__get_user_2)
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ENTRY(__get_user_4)
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add $3,%_ASM_AX
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jc bad_get_user
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mov PER_CPU_VAR(current_task), %_ASM_DX
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cmp TASK_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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ENDPROC(__get_user_4)
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ENTRY(__get_user_8)
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#ifdef CONFIG_X86_64
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add $7,%_ASM_AX
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jc bad_get_user
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mov PER_CPU_VAR(current_task), %_ASM_DX
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cmp TASK_addr_limit(%_ASM_DX),%_ASM_AX
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jae bad_get_user
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ASM_STAC
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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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mov PER_CPU_VAR(current_task), %_ASM_DX
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cmp TASK_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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4: movl -7(%_ASM_AX),%edx
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5: movl -3(%_ASM_AX),%ecx
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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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ENDPROC(__get_user_8)
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bad_get_user:
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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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END(bad_get_user)
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#ifdef CONFIG_X86_32
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bad_get_user_8:
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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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END(bad_get_user_8)
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#endif
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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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#endif
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