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| author | Glauber Costa <gcosta@redhat.com> | 2008-06-24 14:13:16 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-09 07:14:01 (GMT) |
| commit | 9262875395cf22b5a90dd8a640e1070cedf55d0e (patch) | |
| tree | 81b17b8f280817da70b4225409c65aaf1c824db9 | |
| parent | 9aa038815b5756e20a00b8e1efd5740434b37aea (diff) | |
| download | linux-9262875395cf22b5a90dd8a640e1070cedf55d0e.tar.xz | |
x86: adapt x86_64 getuser functions.
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>
| -rw-r--r-- | arch/x86/lib/getuser_64.S | 33 |
1 files changed, 12 insertions, 21 deletions
diff --git a/arch/x86/lib/getuser_64.S b/arch/x86/lib/getuser_64.S index 2b003d3..df37d3a 100644 --- a/arch/x86/lib/getuser_64.S +++ b/arch/x86/lib/getuser_64.S @@ -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) |