mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-20 14:16:02 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
98 lines
1.8 KiB
ArmAsm
98 lines
1.8 KiB
ArmAsm
/*
|
|
* __put_user functions.
|
|
*
|
|
* (C) Copyright 2005 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>
|
|
|
|
|
|
/*
|
|
* __put_user_X
|
|
*
|
|
* Inputs: %eax[:%edx] contains the data
|
|
* %ecx contains the address
|
|
*
|
|
* Outputs: %eax is error code (0 or -EFAULT)
|
|
*
|
|
* These functions should not modify any other registers,
|
|
* as they get called from within inline assembly.
|
|
*/
|
|
|
|
#define ENTER CFI_STARTPROC ; \
|
|
pushl %ebx ; \
|
|
CFI_ADJUST_CFA_OFFSET 4 ; \
|
|
CFI_REL_OFFSET ebx, 0 ; \
|
|
GET_THREAD_INFO(%ebx)
|
|
#define EXIT popl %ebx ; \
|
|
CFI_ADJUST_CFA_OFFSET -4 ; \
|
|
CFI_RESTORE ebx ; \
|
|
ret ; \
|
|
CFI_ENDPROC
|
|
|
|
.text
|
|
ENTRY(__put_user_1)
|
|
ENTER
|
|
cmpl TI_addr_limit(%ebx),%ecx
|
|
jae bad_put_user
|
|
1: movb %al,(%ecx)
|
|
xorl %eax,%eax
|
|
EXIT
|
|
ENDPROC(__put_user_1)
|
|
|
|
ENTRY(__put_user_2)
|
|
ENTER
|
|
movl TI_addr_limit(%ebx),%ebx
|
|
subl $1,%ebx
|
|
cmpl %ebx,%ecx
|
|
jae bad_put_user
|
|
2: movw %ax,(%ecx)
|
|
xorl %eax,%eax
|
|
EXIT
|
|
ENDPROC(__put_user_2)
|
|
|
|
ENTRY(__put_user_4)
|
|
ENTER
|
|
movl TI_addr_limit(%ebx),%ebx
|
|
subl $3,%ebx
|
|
cmpl %ebx,%ecx
|
|
jae bad_put_user
|
|
3: movl %eax,(%ecx)
|
|
xorl %eax,%eax
|
|
EXIT
|
|
ENDPROC(__put_user_4)
|
|
|
|
ENTRY(__put_user_8)
|
|
ENTER
|
|
movl TI_addr_limit(%ebx),%ebx
|
|
subl $7,%ebx
|
|
cmpl %ebx,%ecx
|
|
jae bad_put_user
|
|
4: movl %eax,(%ecx)
|
|
5: movl %edx,4(%ecx)
|
|
xorl %eax,%eax
|
|
EXIT
|
|
ENDPROC(__put_user_8)
|
|
|
|
bad_put_user:
|
|
CFI_STARTPROC simple
|
|
CFI_DEF_CFA esp, 2*4
|
|
CFI_OFFSET eip, -1*4
|
|
CFI_OFFSET ebx, -2*4
|
|
movl $-14,%eax
|
|
EXIT
|
|
END(bad_put_user)
|
|
|
|
.section __ex_table,"a"
|
|
.long 1b,bad_put_user
|
|
.long 2b,bad_put_user
|
|
.long 3b,bad_put_user
|
|
.long 4b,bad_put_user
|
|
.long 5b,bad_put_user
|
|
.previous
|