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Subject[PATCH 12/39] introduce __ASM_REG macro
Date
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>
---
arch/x86/lib/getuser_32.S | 25 +++++++++++++------------
arch/x86/lib/getuser_64.S | 36 ++++++++++++++++++------------------
include/asm-x86/asm.h | 3 +++
3 files changed, 34 insertions(+), 30 deletions(-)
diff --git a/arch/x86/lib/getuser_32.S b/arch/x86/lib/getuser_32.S
index 8200fde..2cc3cee 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)
diff --git a/arch/x86/lib/getuser_64.S b/arch/x86/lib/getuser_64.S
index 6134752..63b0e5c 100644
--- a/arch/x86/lib/getuser_64.S
+++ b/arch/x86/lib/getuser_64.S
@@ -13,14 +13,13 @@
/*
* __get_user_X
*
- * Inputs: %rcx contains the address.
+ * Inputs: %rax 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
*
- * %r8 is destroyed.
*
* These functions should not modify any other registers,
* as they get called from within inline assembly.
@@ -32,14 +31,15 @@
#include <asm/errno.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
+#include <asm/asm.h>

.text
ENTRY(__get_user_1)
CFI_STARTPROC
- GET_THREAD_INFO(%rdx)
- cmp TI_addr_limit(%rdx),%rax
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
-1: movzb (%rax),%edx
+1: movzb (%_ASM_AX),%edx
xor %eax,%eax
ret
CFI_ENDPROC
@@ -47,12 +47,12 @@ ENDPROC(__get_user_1)

ENTRY(__get_user_2)
CFI_STARTPROC
- add $1,%rax
+ add $1,%_ASM_AX
jc bad_get_user
- GET_THREAD_INFO(%rdx)
- cmp TI_addr_limit(%rdx),%rax
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
-2: movzwl -1(%rax),%edx
+2: movzwl -1(%_ASM_AX),%edx
xor %eax,%eax
ret
CFI_ENDPROC
@@ -60,12 +60,12 @@ ENDPROC(__get_user_2)

ENTRY(__get_user_4)
CFI_STARTPROC
- add $3,%rax
+ add $3,%_ASM_AX
jc bad_get_user
- GET_THREAD_INFO(%rdx)
- cmp TI_addr_limit(%rdx),%rax
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
-3: mov -3(%rax),%edx
+3: mov -3(%_ASM_AX),%edx
xor %eax,%eax
ret
CFI_ENDPROC
@@ -73,12 +73,12 @@ ENDPROC(__get_user_4)

ENTRY(__get_user_8)
CFI_STARTPROC
- add $7,%rax
+ add $7,%_ASM_AX
jc bad_get_user
- GET_THREAD_INFO(%rdx)
- cmp TI_addr_limit(%rdx),%rax
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
-4: movq -7(%rax),%rdx
+4: movq -7(%_ASM_AX),%_ASM_DX
xor %eax,%eax
ret
CFI_ENDPROC
@@ -87,7 +87,7 @@ ENDPROC(__get_user_8)
bad_get_user:
CFI_STARTPROC
xor %edx,%edx
- mov $(-EFAULT),%rax
+ mov $(-EFAULT),%_ASM_AX
ret
CFI_ENDPROC
END(bad_get_user)
diff --git a/include/asm-x86/asm.h b/include/asm-x86/asm.h
index 7093982..435402e 100644
--- a/include/asm-x86/asm.h
+++ b/include/asm-x86/asm.h
@@ -14,6 +14,7 @@
#endif

#define __ASM_SIZE(inst) __ASM_SEL(inst##l, inst##q)
+#define __ASM_REG(reg) __ASM_SEL(e##reg, r##reg)

#define _ASM_PTR __ASM_SEL(.long, .quad)
#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
@@ -24,6 +25,8 @@
#define _ASM_ADD __ASM_SIZE(add)
#define _ASM_SUB __ASM_SIZE(sub)
#define _ASM_XADD __ASM_SIZE(xadd)
+#define _ASM_AX __ASM_REG(ax)
+#define _ASM_DX __ASM_REG(dx)

/* Exception table entry */
# define _ASM_EXTABLE(from,to) \
--
1.5.5.1


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