x86: introduce __ASM_REG macro.

There are situations in which the architecture wants to use the
register that represents its word-size, whatever it is. For those,
introduce __ASM_REG in asm.h, along with the first users _ASM_AX
and _ASM_DX. They have users waiting for it, namely the getuser
functions.

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>

1 files changed, 13 insertions, 12 deletions

diff --git a/arch/x86/lib/getuser_32.S b/arch/x86/lib/getuser_32.S
index 8200fde55f57..2cc3ceee8f91 100644
--- a/arch/x86/lib/getuser_32.S
+++ b/arch/x86/lib/getuser_32.S
@@ -11,6 +11,7 @@
 #include <linux/linkage.h>
 #include <asm/dwarf2.h>
 #include <asm/thread_info.h>
+#include <asm/asm.h>
 
 
 /*
@@ -28,10 +29,10 @@
 .text
 ENTRY(__get_user_1)
         CFI_STARTPROC
-        GET_THREAD_INFO(%edx)
-        cmp TI_addr_limit(%edx),%eax
+        GET_THREAD_INFO(%_ASM_DX)
+        cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
         jae bad_get_user
-1:      movzb (%eax),%edx
+1:      movzb (%_ASM_AX),%edx
         xor %eax,%eax
         ret
         CFI_ENDPROC
@@ -39,12 +40,12 @@ ENDPROC(__get_user_1)
 
 ENTRY(__get_user_2)
         CFI_STARTPROC
-        add $1,%eax
+        add $1,%_ASM_AX
         jc bad_get_user
-        GET_THREAD_INFO(%edx)
-        cmp TI_addr_limit(%edx),%eax
+        GET_THREAD_INFO(%_ASM_DX)
+        cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
         jae bad_get_user
-2:      movzwl -1(%eax),%edx
+2:      movzwl -1(%_ASM_AX),%edx
         xor %eax,%eax
         ret
         CFI_ENDPROC
@@ -52,12 +53,12 @@ ENDPROC(__get_user_2)
 
 ENTRY(__get_user_4)
         CFI_STARTPROC
-        add $3,%eax
+        add $3,%_ASM_AX
         jc bad_get_user
-        GET_THREAD_INFO(%edx)
-        cmp TI_addr_limit(%edx),%eax
+        GET_THREAD_INFO(%_ASM_DX)
+        cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
         jae bad_get_user
-3:      mov -3(%eax),%edx
+3:      mov -3(%_ASM_AX),%edx
         xor %eax,%eax
         ret
         CFI_ENDPROC
@@ -66,7 +67,7 @@ ENDPROC(__get_user_4)
 bad_get_user:
         CFI_STARTPROC
         xor %edx,%edx
-        mov $-14,%eax
+        mov $-14,%_ASM_AX
         ret
         CFI_ENDPROC
 END(bad_get_user)