diff options
Diffstat (limited to 'arch/x86_64/lib/getuser_64.S')
| -rw-r--r-- | arch/x86_64/lib/getuser_64.S | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/arch/x86_64/lib/getuser_64.S b/arch/x86_64/lib/getuser_64.S deleted file mode 100644 index 5448876261f..00000000000 --- a/arch/x86_64/lib/getuser_64.S +++ /dev/null @@ -1,109 +0,0 @@ -/* - * __get_user functions. - * - * (C) Copyright 1998 Linus Torvalds - * (C) Copyright 2005 Andi Kleen - * - * These functions have a non-standard call interface - * to make them more efficient, especially as they - * return an error value in addition to the "real" - * return value. - */ - -/* - * __get_user_X - * - * Inputs: %rcx contains the address. - * The register is modified, but all changes are undone - * before returning because the C code doesn't know about it. - * - * Outputs: %rax is error code (0 or -EFAULT) - * %rdx contains zero-extended value - * - * %r8 is destroyed. - * - * These functions should not modify any other registers, - * as they get called from within inline assembly. - */ - -#include <linux/linkage.h> -#include <asm/dwarf2.h> -#include <asm/page.h> -#include <asm/errno.h> -#include <asm/asm-offsets.h> -#include <asm/thread_info.h> - - .text -ENTRY(__get_user_1) - CFI_STARTPROC - GET_THREAD_INFO(%r8) - cmpq threadinfo_addr_limit(%r8),%rcx - jae bad_get_user -1: movzb (%rcx),%edx - xorl %eax,%eax - ret - CFI_ENDPROC -ENDPROC(__get_user_1) - -ENTRY(__get_user_2) - CFI_STARTPROC - GET_THREAD_INFO(%r8) - addq $1,%rcx - jc 20f - cmpq threadinfo_addr_limit(%r8),%rcx - jae 20f - decq %rcx -2: movzwl (%rcx),%edx - xorl %eax,%eax - ret -20: decq %rcx - jmp bad_get_user - CFI_ENDPROC -ENDPROC(__get_user_2) - -ENTRY(__get_user_4) - CFI_STARTPROC - GET_THREAD_INFO(%r8) - addq $3,%rcx - jc 30f - cmpq threadinfo_addr_limit(%r8),%rcx - jae 30f - subq $3,%rcx -3: movl (%rcx),%edx - xorl %eax,%eax - ret -30: subq $3,%rcx - jmp bad_get_user - CFI_ENDPROC -ENDPROC(__get_user_4) - -ENTRY(__get_user_8) - CFI_STARTPROC - GET_THREAD_INFO(%r8) - addq $7,%rcx - jc 40f - cmpq threadinfo_addr_limit(%r8),%rcx - jae 40f - subq $7,%rcx -4: movq (%rcx),%rdx - xorl %eax,%eax - ret -40: subq $7,%rcx - jmp bad_get_user - CFI_ENDPROC -ENDPROC(__get_user_8) - -bad_get_user: - CFI_STARTPROC - xorl %edx,%edx - movq $(-EFAULT),%rax - ret - CFI_ENDPROC -END(bad_get_user) - -.section __ex_table,"a" - .quad 1b,bad_get_user - .quad 2b,bad_get_user - .quad 3b,bad_get_user - .quad 4b,bad_get_user -.previous |