x86: merge getuser asm functions.

getuser_32.S and getuser_64.S are merged into getuser.S.
Signed-off-by: NGlauber Costa <gcosta@redhat.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/lib/Makefile

@@ -5,7 +5,7 @@
 obj-$(CONFIG_SMP) := msr-on-cpu.o
 
 lib-y := delay.o
-lib-y += usercopy_$(BITS).o getuser_$(BITS).o putuser_$(BITS).o
+lib-y += usercopy_$(BITS).o getuser.o putuser_$(BITS).o
 lib-y += memcpy_$(BITS).o
 
 ifeq ($(CONFIG_X86_32),y)

arch/x86/lib/getuser_64.S → arch/x86/lib/getuser.S

@@ -3,6 +3,7 @@
  *
  * (C) Copyright 1998 Linus Torvalds
  * (C) Copyright 2005 Andi Kleen
+ * (C) Copyright 2008 Glauber Costa
  *
  * These functions have a non-standard call interface
  * to make them more efficient, especially as they
@@ -13,13 +14,13 @@
 /*
  * __get_user_X
  *
- * Inputs:	%rax contains the address.
+ * Inputs:	%[r|e]ax contains the address.
  *		The register is modified, but all changes are undone
  *		before returning because the C code doesn't know about it.
  *
- * Outputs:	%rax is error code (0 or -EFAULT)
- *		%rdx contains zero-extended value
- * 
+ * Outputs:	%[r|e]ax is error code (0 or -EFAULT)
+ *		%[r|e]dx contains zero-extended value
+ *
  *
  * These functions should not modify any other registers,
  * as they get called from within inline assembly.
@@ -71,6 +72,7 @@ ENTRY(__get_user_4)
 	CFI_ENDPROC
 ENDPROC(__get_user_4)
 
+#ifdef CONFIG_X86_64
 ENTRY(__get_user_8)
 	CFI_STARTPROC
 	add $7,%_ASM_AX
@@ -83,6 +85,7 @@ ENTRY(__get_user_8)
 	ret
 	CFI_ENDPROC
 ENDPROC(__get_user_8)
+#endif
 
 bad_get_user:
 	CFI_STARTPROC
@@ -96,5 +99,6 @@ END(bad_get_user)
 	_ASM_PTR 1b,bad_get_user
 	_ASM_PTR 2b,bad_get_user
 	_ASM_PTR 3b,bad_get_user
+#ifdef CONFIG_X86_64
 	_ASM_PTR 4b,bad_get_user
-.previous
+#endif

arch/x86/lib/getuser_32.S

-/*
- * __get_user functions.
- *
- * (C) Copyright 1998 Linus Torvalds
- *
- * These functions have a non-standard call interface
- * to make them more efficient, especially as they
- * return an error value in addition to the "real"
- * return value.
- */
-#include <linux/linkage.h>
-#include <asm/dwarf2.h>
-#include <asm/thread_info.h>
-#include <asm/asm.h>
-
-
-/*
- * __get_user_X
- *
- * Inputs:	%eax contains the address
- *
- * Outputs:	%eax is error code (0 or -EFAULT)
- *		%edx contains zero-extended value
- *
- * These functions should not modify any other registers,
- * as they get called from within inline assembly.
- */
-
-.text
-ENTRY(__get_user_1)
-	CFI_STARTPROC
-	GET_THREAD_INFO(%_ASM_DX)
-	cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
-	jae bad_get_user
-1:	movzb (%_ASM_AX),%edx
-	xor %eax,%eax
-	ret
-	CFI_ENDPROC
-ENDPROC(__get_user_1)
-
-ENTRY(__get_user_2)
-	CFI_STARTPROC
-	add $1,%_ASM_AX
-	jc bad_get_user
-	GET_THREAD_INFO(%_ASM_DX)
-	cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
-	jae bad_get_user
-2:	movzwl -1(%_ASM_AX),%edx
-	xor %eax,%eax
-	ret
-	CFI_ENDPROC
-ENDPROC(__get_user_2)
-
-ENTRY(__get_user_4)
-	CFI_STARTPROC
-	add $3,%_ASM_AX
-	jc bad_get_user
-	GET_THREAD_INFO(%_ASM_DX)
-	cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
-	jae bad_get_user
-3:	mov -3(%_ASM_AX),%edx
-	xor %eax,%eax
-	ret
-	CFI_ENDPROC
-ENDPROC(__get_user_4)
-
-bad_get_user:
-	CFI_STARTPROC
-	xor %edx,%edx
-	mov $-14,%_ASM_AX
-	ret
-	CFI_ENDPROC
-END(bad_get_user)
-
-.section __ex_table,"a"
-	_ASM_PTR 1b,bad_get_user
-	_ASM_PTR 2b,bad_get_user
-	_ASM_PTR 3b,bad_get_user
-.previous

include/asm-x86/asm.h

@@ -3,8 +3,10 @@
 
 #ifdef __ASSEMBLY__
 # define __ASM_FORM(x)	x
+# define __ASM_EX_SEC	.section __ex_table
 #else
 # define __ASM_FORM(x)	" " #x " "
+# define __ASM_EX_SEC	" .section __ex_table,\"a\"\n"
 #endif
 
 #ifdef CONFIG_X86_32
@@ -30,7 +32,7 @@
 
 /* Exception table entry */
 # define _ASM_EXTABLE(from,to) \
-	" .section __ex_table,\"a\"\n" \
+	__ASM_EX_SEC	\
 	_ASM_ALIGN "\n" \
 	_ASM_PTR #from "," #to "\n" \
 	" .previous\n"