1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
87 lines
1.5 KiB
ArmAsm
87 lines
1.5 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 <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 pushl %ebx ; GET_THREAD_INFO(%ebx)
|
|
#define EXIT popl %ebx ; ret
|
|
|
|
.text
|
|
.align 4
|
|
.globl __put_user_1
|
|
__put_user_1:
|
|
ENTER
|
|
cmpl TI_addr_limit(%ebx),%ecx
|
|
jae bad_put_user
|
|
1: movb %al,(%ecx)
|
|
xorl %eax,%eax
|
|
EXIT
|
|
|
|
.align 4
|
|
.globl __put_user_2
|
|
__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
|
|
|
|
.align 4
|
|
.globl __put_user_4
|
|
__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
|
|
|
|
.align 4
|
|
.globl __put_user_8
|
|
__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
|
|
|
|
bad_put_user:
|
|
movl $-14,%eax
|
|
EXIT
|
|
|
|
.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
|