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x86: clobber rbx in putuser_64.S.

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Instead of clobbering r8, clobber rbx, which is the i386 way.

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 15:03:40 -03:00 committed by Ingo Molnar
parent 70706e432e
commit 770546b99f
2 changed files with 10 additions and 10 deletions
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18
arch/x86/lib/putuser_64.S
View file

@ -18,7 +18,7 @@
*
* Outputs: %rax is error code (0 or -EFAULT)
*
* %r8 is destroyed.
* %rbx is destroyed.
*
* These functions should not modify any other registers,
* as they get called from within inline assembly.
@ -34,8 +34,8 @@
.text
ENTRY(__put_user_1)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
cmpq TI_addr_limit(%r8),%rcx
GET_THREAD_INFO(%rbx)
cmpq TI_addr_limit(%rbx),%rcx
jae bad_put_user
1: movb %dl,(%rcx)
xorl %eax,%eax
@ -45,10 +45,10 @@ ENDPROC(__put_user_1)
ENTRY(__put_user_2)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
GET_THREAD_INFO(%rbx)
addq $1,%rcx
jc 20f
cmpq TI_addr_limit(%r8),%rcx
cmpq TI_addr_limit(%rbx),%rcx
jae 20f
decq %rcx
2: movw %dx,(%rcx)
@ -61,10 +61,10 @@ ENDPROC(__put_user_2)
ENTRY(__put_user_4)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
GET_THREAD_INFO(%rbx)
addq $3,%rcx
jc 30f
cmpq TI_addr_limit(%r8),%rcx
cmpq TI_addr_limit(%rbx),%rcx
jae 30f
subq $3,%rcx
3: movl %edx,(%rcx)
@ -77,10 +77,10 @@ ENDPROC(__put_user_4)
ENTRY(__put_user_8)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
GET_THREAD_INFO(%rbx)
addq $7,%rcx
jc 40f
cmpq TI_addr_limit(%r8),%rcx
cmpq TI_addr_limit(%rbx),%rcx
jae 40f
subq $7,%rcx
4: movq %rdx,(%rcx)

2
include/asm-x86/uaccess_64.h
View file

@ -131,7 +131,7 @@ extern void __put_user_bad(void);
asm volatile("call __put_user_" #size \
:"=a" (ret) \
:"c" (ptr),"d" (x) \
:"r8")
:"ebx")
#define put_user(x, ptr) \
__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))