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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) ENTRY(__get_user_2)
CFI_STARTPROC CFI_STARTPROC
GET_THREAD_INFO(%rdx)
addq $1,%rax addq $1,%rax
jc 20f jc bad_get_user
GET_THREAD_INFO(%rdx)
cmpq threadinfo_addr_limit(%rdx),%rax cmpq threadinfo_addr_limit(%rdx),%rax
jae 20f jae bad_get_user
decq %rax 2: movzwl -1(%rax),%edx
2: movzwl (%rax),%edx
xorl %eax,%eax xorl %eax,%eax
ret ret
20: decq %rax
jmp bad_get_user
CFI_ENDPROC CFI_ENDPROC
ENDPROC(__get_user_2) ENDPROC(__get_user_2)
ENTRY(__get_user_4) ENTRY(__get_user_4)
CFI_STARTPROC CFI_STARTPROC
GET_THREAD_INFO(%rdx)
addq $3,%rax addq $3,%rax
jc 30f jc bad_get_user
GET_THREAD_INFO(%rdx)
cmpq threadinfo_addr_limit(%rdx),%rax cmpq threadinfo_addr_limit(%rdx),%rax
jae 30f jae bad_get_user
subq $3,%rax 3: movl -3(%rax),%edx
3: movl (%rax),%edx
xorl %eax,%eax xorl %eax,%eax
ret ret
30: subq $3,%rax
jmp bad_get_user
CFI_ENDPROC CFI_ENDPROC
ENDPROC(__get_user_4) ENDPROC(__get_user_4)
ENTRY(__get_user_8) ENTRY(__get_user_8)
CFI_STARTPROC CFI_STARTPROC
GET_THREAD_INFO(%rdx)
addq $7,%rax addq $7,%rax
jc 40f jc bad_get_user
GET_THREAD_INFO(%rdx)
cmpq threadinfo_addr_limit(%rdx),%rax cmpq threadinfo_addr_limit(%rdx),%rax
jae 40f jae bad_get_user
subq $7,%rax 4: movq -7(%rax),%rdx
4: movq (%rax),%rdx
xorl %eax,%eax xorl %eax,%eax
ret ret
40: subq $7,%rax
jmp bad_get_user
CFI_ENDPROC CFI_ENDPROC
ENDPROC(__get_user_8) ENDPROC(__get_user_8)