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x86: introduce __ASM_REG macro.

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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>
This commit is contained in:
Glauber Costa 2008-06-24 11:37:57 -03:00 committed by Ingo Molnar
parent ef8c1a2d0e
commit 40faf463e6
3 changed files with 34 additions and 30 deletions
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25
arch/x86/lib/getuser_32.S
View File

@ -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)

36
arch/x86/lib/getuser_64.S
View File

@ -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)

3
include/asm-x86/asm.h
View File

@ -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) \