forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
167 lines
3.4 KiB
167 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* linux/arch/arm/lib/getuser.S |
|
* |
|
* Copyright (C) 2001 Russell King |
|
* |
|
* Idea from x86 version, (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. |
|
* |
|
* __get_user_X |
|
* |
|
* Inputs: r0 contains the address |
|
* r1 contains the address limit, which must be preserved |
|
* Outputs: r0 is the error code |
|
* r2, r3 contains the zero-extended value |
|
* lr corrupted |
|
* |
|
* No other registers must be altered. (see <asm/uaccess.h> |
|
* for specific ASM register usage). |
|
* |
|
* Note that ADDR_LIMIT is either 0 or 0xc0000000. |
|
* Note also that it is intended that __get_user_bad is not global. |
|
*/ |
|
#include <linux/linkage.h> |
|
#include <asm/assembler.h> |
|
#include <asm/errno.h> |
|
#include <asm/domain.h> |
|
|
|
ENTRY(__get_user_1) |
|
check_uaccess r0, 1, r1, r2, __get_user_bad |
|
1: TUSER(ldrb) r2, [r0] |
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_1) |
|
_ASM_NOKPROBE(__get_user_1) |
|
|
|
ENTRY(__get_user_2) |
|
check_uaccess r0, 2, r1, r2, __get_user_bad |
|
#if __LINUX_ARM_ARCH__ >= 6 |
|
|
|
2: TUSER(ldrh) r2, [r0] |
|
|
|
#else |
|
|
|
#ifdef CONFIG_CPU_USE_DOMAINS |
|
rb .req ip |
|
2: ldrbt r2, [r0], #1 |
|
3: ldrbt rb, [r0], #0 |
|
#else |
|
rb .req r0 |
|
2: ldrb r2, [r0] |
|
3: ldrb rb, [r0, #1] |
|
#endif |
|
#ifndef __ARMEB__ |
|
orr r2, r2, rb, lsl #8 |
|
#else |
|
orr r2, rb, r2, lsl #8 |
|
#endif |
|
|
|
#endif /* __LINUX_ARM_ARCH__ >= 6 */ |
|
|
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_2) |
|
_ASM_NOKPROBE(__get_user_2) |
|
|
|
ENTRY(__get_user_4) |
|
check_uaccess r0, 4, r1, r2, __get_user_bad |
|
4: TUSER(ldr) r2, [r0] |
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_4) |
|
_ASM_NOKPROBE(__get_user_4) |
|
|
|
ENTRY(__get_user_8) |
|
check_uaccess r0, 8, r1, r2, __get_user_bad8 |
|
#ifdef CONFIG_THUMB2_KERNEL |
|
5: TUSER(ldr) r2, [r0] |
|
6: TUSER(ldr) r3, [r0, #4] |
|
#else |
|
5: TUSER(ldr) r2, [r0], #4 |
|
6: TUSER(ldr) r3, [r0] |
|
#endif |
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_8) |
|
_ASM_NOKPROBE(__get_user_8) |
|
|
|
#ifdef __ARMEB__ |
|
ENTRY(__get_user_32t_8) |
|
check_uaccess r0, 8, r1, r2, __get_user_bad |
|
#ifdef CONFIG_CPU_USE_DOMAINS |
|
add r0, r0, #4 |
|
7: ldrt r2, [r0] |
|
#else |
|
7: ldr r2, [r0, #4] |
|
#endif |
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_32t_8) |
|
_ASM_NOKPROBE(__get_user_32t_8) |
|
|
|
ENTRY(__get_user_64t_1) |
|
check_uaccess r0, 1, r1, r2, __get_user_bad8 |
|
8: TUSER(ldrb) r3, [r0] |
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_64t_1) |
|
_ASM_NOKPROBE(__get_user_64t_1) |
|
|
|
ENTRY(__get_user_64t_2) |
|
check_uaccess r0, 2, r1, r2, __get_user_bad8 |
|
#ifdef CONFIG_CPU_USE_DOMAINS |
|
rb .req ip |
|
9: ldrbt r3, [r0], #1 |
|
10: ldrbt rb, [r0], #0 |
|
#else |
|
rb .req r0 |
|
9: ldrb r3, [r0] |
|
10: ldrb rb, [r0, #1] |
|
#endif |
|
orr r3, rb, r3, lsl #8 |
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_64t_2) |
|
_ASM_NOKPROBE(__get_user_64t_2) |
|
|
|
ENTRY(__get_user_64t_4) |
|
check_uaccess r0, 4, r1, r2, __get_user_bad8 |
|
11: TUSER(ldr) r3, [r0] |
|
mov r0, #0 |
|
ret lr |
|
ENDPROC(__get_user_64t_4) |
|
_ASM_NOKPROBE(__get_user_64t_4) |
|
#endif |
|
|
|
__get_user_bad8: |
|
mov r3, #0 |
|
__get_user_bad: |
|
mov r2, #0 |
|
mov r0, #-EFAULT |
|
ret lr |
|
ENDPROC(__get_user_bad) |
|
ENDPROC(__get_user_bad8) |
|
_ASM_NOKPROBE(__get_user_bad) |
|
_ASM_NOKPROBE(__get_user_bad8) |
|
|
|
.pushsection __ex_table, "a" |
|
.long 1b, __get_user_bad |
|
.long 2b, __get_user_bad |
|
#if __LINUX_ARM_ARCH__ < 6 |
|
.long 3b, __get_user_bad |
|
#endif |
|
.long 4b, __get_user_bad |
|
.long 5b, __get_user_bad8 |
|
.long 6b, __get_user_bad8 |
|
#ifdef __ARMEB__ |
|
.long 7b, __get_user_bad |
|
.long 8b, __get_user_bad8 |
|
.long 9b, __get_user_bad8 |
|
.long 10b, __get_user_bad8 |
|
.long 11b, __get_user_bad8 |
|
#endif |
|
.popsection
|
|
|