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Commit 268cf048 authored by Glauber Costa's avatar Glauber Costa Committed by Ingo Molnar
Browse files

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



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

Signed-off-by: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 6c2d4586

arch/x86/lib/putuser_32.S

+2 −11
Original line number Diff line number Diff line
@@ -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)

include/asm-x86/uaccess_32.h

+5 −5
Original line number Diff line number Diff line
@@ -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.