e2d5df935d
Delete obsolete stuff from arch makefiles Rename .h file to asm-offsets.h Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
101 lines
1.8 KiB
ArmAsm
101 lines
1.8 KiB
ArmAsm
/*
|
|
* __get_user functions.
|
|
*
|
|
* (C) Copyright 1998 Linus Torvalds
|
|
* (C) Copyright 2005 Andi Kleen
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* __get_user_X
|
|
*
|
|
* Inputs: %rcx 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.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/page.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/thread_info.h>
|
|
|
|
.text
|
|
.p2align 4
|
|
.globl __get_user_1
|
|
__get_user_1:
|
|
GET_THREAD_INFO(%r8)
|
|
cmpq threadinfo_addr_limit(%r8),%rcx
|
|
jae bad_get_user
|
|
1: movzb (%rcx),%edx
|
|
xorl %eax,%eax
|
|
ret
|
|
|
|
.p2align 4
|
|
.globl __get_user_2
|
|
__get_user_2:
|
|
GET_THREAD_INFO(%r8)
|
|
addq $1,%rcx
|
|
jc 20f
|
|
cmpq threadinfo_addr_limit(%r8),%rcx
|
|
jae 20f
|
|
decq %rcx
|
|
2: movzwl (%rcx),%edx
|
|
xorl %eax,%eax
|
|
ret
|
|
20: decq %rcx
|
|
jmp bad_get_user
|
|
|
|
.p2align 4
|
|
.globl __get_user_4
|
|
__get_user_4:
|
|
GET_THREAD_INFO(%r8)
|
|
addq $3,%rcx
|
|
jc 30f
|
|
cmpq threadinfo_addr_limit(%r8),%rcx
|
|
jae 30f
|
|
subq $3,%rcx
|
|
3: movl (%rcx),%edx
|
|
xorl %eax,%eax
|
|
ret
|
|
30: subq $3,%rcx
|
|
jmp bad_get_user
|
|
|
|
.p2align 4
|
|
.globl __get_user_8
|
|
__get_user_8:
|
|
GET_THREAD_INFO(%r8)
|
|
addq $7,%rcx
|
|
jc 40f
|
|
cmpq threadinfo_addr_limit(%r8),%rcx
|
|
jae 40f
|
|
subq $7,%rcx
|
|
4: movq (%rcx),%rdx
|
|
xorl %eax,%eax
|
|
ret
|
|
40: subq $7,%rcx
|
|
jmp bad_get_user
|
|
|
|
bad_get_user:
|
|
xorl %edx,%edx
|
|
movq $(-EFAULT),%rax
|
|
ret
|
|
|
|
.section __ex_table,"a"
|
|
.quad 1b,bad_get_user
|
|
.quad 2b,bad_get_user
|
|
.quad 3b,bad_get_user
|
|
.quad 4b,bad_get_user
|
|
.previous
|