mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-29 17:25:38 +00:00
94ea9c0521
The following commit:
ddb5cdbafa ("kbuild: generate KSYMTAB entries by modpost")
deprecated <asm/export.h>, which is now a wrapper of <linux/export.h>.
Use <linux/export.h> in *.S as well as in *.c files.
After all the <asm/export.h> lines are replaced, <asm/export.h> and
<asm-generic/export.h> will be removed.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230806145958.380314-2-masahiroy@kernel.org
92 lines
1.7 KiB
ArmAsm
92 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright 2008 Vitaly Mayatskikh <vmayatsk@redhat.com>
|
|
* Copyright 2002 Andi Kleen, SuSE Labs.
|
|
*
|
|
* Functions to copy from and to user space.
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/cpufeatures.h>
|
|
#include <asm/alternative.h>
|
|
#include <asm/asm.h>
|
|
|
|
/*
|
|
* rep_movs_alternative - memory copy with exception handling.
|
|
* This version is for CPUs that don't have FSRM (Fast Short Rep Movs)
|
|
*
|
|
* Input:
|
|
* rdi destination
|
|
* rsi source
|
|
* rcx count
|
|
*
|
|
* Output:
|
|
* rcx uncopied bytes or 0 if successful.
|
|
*
|
|
* NOTE! The calling convention is very intentionally the same as
|
|
* for 'rep movs', so that we can rewrite the function call with
|
|
* just a plain 'rep movs' on machines that have FSRM. But to make
|
|
* it simpler for us, we can clobber rsi/rdi and rax freely.
|
|
*/
|
|
SYM_FUNC_START(rep_movs_alternative)
|
|
cmpq $64,%rcx
|
|
jae .Llarge
|
|
|
|
cmp $8,%ecx
|
|
jae .Lword
|
|
|
|
testl %ecx,%ecx
|
|
je .Lexit
|
|
|
|
.Lcopy_user_tail:
|
|
0: movb (%rsi),%al
|
|
1: movb %al,(%rdi)
|
|
inc %rdi
|
|
inc %rsi
|
|
dec %rcx
|
|
jne .Lcopy_user_tail
|
|
.Lexit:
|
|
RET
|
|
|
|
_ASM_EXTABLE_UA( 0b, .Lexit)
|
|
_ASM_EXTABLE_UA( 1b, .Lexit)
|
|
|
|
.p2align 4
|
|
.Lword:
|
|
2: movq (%rsi),%rax
|
|
3: movq %rax,(%rdi)
|
|
addq $8,%rsi
|
|
addq $8,%rdi
|
|
sub $8,%ecx
|
|
je .Lexit
|
|
cmp $8,%ecx
|
|
jae .Lword
|
|
jmp .Lcopy_user_tail
|
|
|
|
_ASM_EXTABLE_UA( 2b, .Lcopy_user_tail)
|
|
_ASM_EXTABLE_UA( 3b, .Lcopy_user_tail)
|
|
|
|
.Llarge:
|
|
0: ALTERNATIVE "jmp .Llarge_movsq", "rep movsb", X86_FEATURE_ERMS
|
|
1: RET
|
|
|
|
_ASM_EXTABLE_UA( 0b, 1b)
|
|
|
|
.Llarge_movsq:
|
|
movq %rcx,%rax
|
|
shrq $3,%rcx
|
|
andl $7,%eax
|
|
0: rep movsq
|
|
movl %eax,%ecx
|
|
testl %ecx,%ecx
|
|
jne .Lcopy_user_tail
|
|
RET
|
|
|
|
1: leaq (%rax,%rcx,8),%rcx
|
|
jmp .Lcopy_user_tail
|
|
|
|
_ASM_EXTABLE_UA( 0b, 1b)
|
|
SYM_FUNC_END(rep_movs_alternative)
|
|
EXPORT_SYMBOL(rep_movs_alternative)
|