From: Thomas Gleixner Date: Thu, 11 Oct 2007 09:15:45 +0000 (+0200) Subject: x86_64: prepare shared lib/getuser.S X-Git-Tag: firefly_0821_release~26152 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4529a0f636cd77909fb1f10c25edc52a22950366;p=firefly-linux-kernel-4.4.55.git x86_64: prepare shared lib/getuser.S Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- diff --git a/arch/x86_64/lib/Makefile b/arch/x86_64/lib/Makefile index 01a4178b6ea7..9212301b6427 100644 --- a/arch/x86_64/lib/Makefile +++ b/arch/x86_64/lib/Makefile @@ -8,6 +8,6 @@ obj-y := io.o iomap_copy_64.o obj-$(CONFIG_SMP) += msr-on-cpu.o lib-y := csum-partial.o csum-copy_64.o csum-wrappers_64.o delay.o \ - usercopy.o getuser.o putuser.o \ + usercopy.o getuser_64.o putuser.o \ thunk_64.o clear_page_64.o copy_page_64.o bitstr_64.o bitops.o lib-y += memcpy_64.o memmove_64.o memset.o copy_user.o rwlock_64.o copy_user_nocache_64.o diff --git a/arch/x86_64/lib/getuser.S b/arch/x86_64/lib/getuser.S deleted file mode 100644 index 5448876261f8..000000000000 --- a/arch/x86_64/lib/getuser.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 -#include -#include -#include -#include -#include - - .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 diff --git a/arch/x86_64/lib/getuser_64.S b/arch/x86_64/lib/getuser_64.S new file mode 100644 index 000000000000..5448876261f8 --- /dev/null +++ b/arch/x86_64/lib/getuser_64.S @@ -0,0 +1,109 @@ +/* + * __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 +#include +#include +#include +#include +#include + + .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