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x86: adapt x86_64 getuser functions.

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Instead of doing a sub after the addition, use the
offset directly at the memory operand of the mov instructions.
This is the way i386 do.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber Costa 2008-06-24 11:13:16 -03:00 committed by Ingo Molnar
parent 9aa038815b
commit 9262875395
1 changed files with 12 additions and 21 deletions
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33
arch/x86/lib/getuser_64.S
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@ -47,49 +47,40 @@ ENDPROC(__get_user_1)
ENTRY(__get_user_2)
CFI_STARTPROC
GET_THREAD_INFO(%rdx)
addq $1,%rax
jc 20f
jc bad_get_user
GET_THREAD_INFO(%rdx)
cmpq threadinfo_addr_limit(%rdx),%rax
jae 20f
decq %rax
2: movzwl (%rax),%edx
jae bad_get_user
2: movzwl -1(%rax),%edx
xorl %eax,%eax
ret
20: decq %rax
jmp bad_get_user
CFI_ENDPROC
ENDPROC(__get_user_2)
ENTRY(__get_user_4)
CFI_STARTPROC
GET_THREAD_INFO(%rdx)
addq $3,%rax
jc 30f
jc bad_get_user
GET_THREAD_INFO(%rdx)
cmpq threadinfo_addr_limit(%rdx),%rax
jae 30f
subq $3,%rax
3: movl (%rax),%edx
jae bad_get_user
3: movl -3(%rax),%edx
xorl %eax,%eax
ret
30: subq $3,%rax
jmp bad_get_user
CFI_ENDPROC
ENDPROC(__get_user_4)
ENTRY(__get_user_8)
CFI_STARTPROC
GET_THREAD_INFO(%rdx)
addq $7,%rax
jc 40f
jc bad_get_user
GET_THREAD_INFO(%rdx)
cmpq threadinfo_addr_limit(%rdx),%rax
jae 40f
subq $7,%rax
4: movq (%rax),%rdx
jae bad_get_user
4: movq -7(%rax),%rdx
xorl %eax,%eax
ret
40: subq $7,%rax
jmp bad_get_user
CFI_ENDPROC
ENDPROC(__get_user_8)