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x86: don't save ebx in putuser_32.S.

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Clobber it in the inline asm macros, and let the compiler do this for us.

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 12:40:55 -03:00 committed by Ingo Molnar
parent 6c2d458680
commit 268cf048c8
2 changed files with 7 additions and 16 deletions
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13
arch/x86/lib/putuser_32.S
View File

@ -26,14 +26,8 @@
*/
#define ENTER CFI_STARTPROC ; \
pushl %ebx ; \
CFI_ADJUST_CFA_OFFSET 4 ; \
CFI_REL_OFFSET ebx, 0 ; \
GET_THREAD_INFO(%ebx)
#define EXIT popl %ebx ; \
CFI_ADJUST_CFA_OFFSET -4 ; \
CFI_RESTORE ebx ; \
ret ; \
#define EXIT ret ; \
CFI_ENDPROC
.text
@ -81,10 +75,7 @@ ENTRY(__put_user_8)
ENDPROC(__put_user_8)
bad_put_user:
CFI_STARTPROC simple
CFI_DEF_CFA esp, 2*4
CFI_OFFSET eip, -1*4
CFI_OFFSET ebx, -2*4
CFI_STARTPROC
movl $-14,%eax
EXIT
END(bad_put_user)

10
include/asm-x86/uaccess_32.h
View File

@ -188,23 +188,23 @@ extern void __put_user_8(void);
#define __put_user_1(x, ptr) \
asm volatile("call __put_user_1" : "=a" (__ret_pu) \
: "0" ((typeof(*(ptr)))(x)), "c" (ptr))
: "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#define __put_user_2(x, ptr) \
asm volatile("call __put_user_2" : "=a" (__ret_pu) \
: "0" ((typeof(*(ptr)))(x)), "c" (ptr))
: "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#define __put_user_4(x, ptr) \
asm volatile("call __put_user_4" : "=a" (__ret_pu) \
: "0" ((typeof(*(ptr)))(x)), "c" (ptr))
: "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#define __put_user_8(x, ptr) \
asm volatile("call __put_user_8" : "=a" (__ret_pu) \
: "A" ((typeof(*(ptr)))(x)), "c" (ptr))
: "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#define __put_user_X(x, ptr) \
asm volatile("call __put_user_X" : "=a" (__ret_pu) \
: "c" (ptr))
: "c" (ptr): "ebx")
/**
* put_user: - Write a simple value into user space.