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!
71 lines
1.2 KiB
ArmAsm
71 lines
1.2 KiB
ArmAsm
/*
|
|
* __get_user functions.
|
|
*
|
|
* (C) Copyright 1998 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>
|
|
|
|
|
|
/*
|
|
* __get_user_X
|
|
*
|
|
* Inputs: %eax contains the address
|
|
*
|
|
* Outputs: %eax is error code (0 or -EFAULT)
|
|
* %edx contains zero-extended value
|
|
*
|
|
* These functions should not modify any other registers,
|
|
* as they get called from within inline assembly.
|
|
*/
|
|
|
|
.text
|
|
.align 4
|
|
.globl __get_user_1
|
|
__get_user_1:
|
|
GET_THREAD_INFO(%edx)
|
|
cmpl TI_addr_limit(%edx),%eax
|
|
jae bad_get_user
|
|
1: movzbl (%eax),%edx
|
|
xorl %eax,%eax
|
|
ret
|
|
|
|
.align 4
|
|
.globl __get_user_2
|
|
__get_user_2:
|
|
addl $1,%eax
|
|
jc bad_get_user
|
|
GET_THREAD_INFO(%edx)
|
|
cmpl TI_addr_limit(%edx),%eax
|
|
jae bad_get_user
|
|
2: movzwl -1(%eax),%edx
|
|
xorl %eax,%eax
|
|
ret
|
|
|
|
.align 4
|
|
.globl __get_user_4
|
|
__get_user_4:
|
|
addl $3,%eax
|
|
jc bad_get_user
|
|
GET_THREAD_INFO(%edx)
|
|
cmpl TI_addr_limit(%edx),%eax
|
|
jae bad_get_user
|
|
3: movl -3(%eax),%edx
|
|
xorl %eax,%eax
|
|
ret
|
|
|
|
bad_get_user:
|
|
xorl %edx,%edx
|
|
movl $-14,%eax
|
|
ret
|
|
|
|
.section __ex_table,"a"
|
|
.long 1b,bad_get_user
|
|
.long 2b,bad_get_user
|
|
.long 3b,bad_get_user
|
|
.previous
|