mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-02 23:27:06 +00:00
8ac6f5d7f8
There are no remaining callers of set_fs(), so just remove it along with all associated code that operates on thread_info->addr_limit. There are still further optimizations that can be done: - In get_user(), the address check could be moved entirely into the out of line code, rather than passing a constant as an argument, - I assume the DACR handling can be simplified as we now only change it during user access when CONFIG_CPU_SW_DOMAIN_PAN is set, but not during set_fs(). Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
128 lines
2.4 KiB
ArmAsm
128 lines
2.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/arch/arm/lib/copy_to_user.S
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Sep 29, 2005
|
|
* Copyright: MontaVista Software, Inc.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/unwind.h>
|
|
|
|
/*
|
|
* Prototype:
|
|
*
|
|
* size_t arm_copy_to_user(void *to, const void *from, size_t n)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* copy a block to user memory from kernel memory
|
|
*
|
|
* Params:
|
|
*
|
|
* to = user memory
|
|
* from = kernel memory
|
|
* n = number of bytes to copy
|
|
*
|
|
* Return value:
|
|
*
|
|
* Number of bytes NOT copied.
|
|
*/
|
|
|
|
#define LDR1W_SHIFT 0
|
|
|
|
.macro ldr1w ptr reg abort
|
|
W(ldr) \reg, [\ptr], #4
|
|
.endm
|
|
|
|
.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
|
|
ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
|
|
.endm
|
|
|
|
.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
|
ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
|
|
.endm
|
|
|
|
.macro ldr1b ptr reg cond=al abort
|
|
ldrb\cond \reg, [\ptr], #1
|
|
.endm
|
|
|
|
#ifdef CONFIG_CPU_USE_DOMAINS
|
|
|
|
#ifndef CONFIG_THUMB2_KERNEL
|
|
#define STR1W_SHIFT 0
|
|
#else
|
|
#define STR1W_SHIFT 1
|
|
#endif
|
|
|
|
.macro str1w ptr reg abort
|
|
strusr \reg, \ptr, 4, abort=\abort
|
|
.endm
|
|
|
|
.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
|
str1w \ptr, \reg1, \abort
|
|
str1w \ptr, \reg2, \abort
|
|
str1w \ptr, \reg3, \abort
|
|
str1w \ptr, \reg4, \abort
|
|
str1w \ptr, \reg5, \abort
|
|
str1w \ptr, \reg6, \abort
|
|
str1w \ptr, \reg7, \abort
|
|
str1w \ptr, \reg8, \abort
|
|
.endm
|
|
|
|
#else
|
|
|
|
#define STR1W_SHIFT 0
|
|
|
|
.macro str1w ptr reg abort
|
|
USERL(\abort, W(str) \reg, [\ptr], #4)
|
|
.endm
|
|
|
|
.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
|
USERL(\abort, stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8})
|
|
.endm
|
|
|
|
#endif /* CONFIG_CPU_USE_DOMAINS */
|
|
|
|
.macro str1b ptr reg cond=al abort
|
|
strusr \reg, \ptr, 1, \cond, abort=\abort
|
|
.endm
|
|
|
|
.macro enter reg1 reg2
|
|
mov r3, #0
|
|
stmdb sp!, {r0, r2, r3, \reg1, \reg2}
|
|
.endm
|
|
|
|
.macro usave reg1 reg2
|
|
UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
|
|
.endm
|
|
|
|
.macro exit reg1 reg2
|
|
add sp, sp, #8
|
|
ldmfd sp!, {r0, \reg1, \reg2}
|
|
.endm
|
|
|
|
.text
|
|
|
|
ENTRY(__copy_to_user_std)
|
|
WEAK(arm_copy_to_user)
|
|
#ifdef CONFIG_CPU_SPECTRE
|
|
ldr r3, =TASK_SIZE
|
|
uaccess_mask_range_ptr r0, r2, r3, ip
|
|
#endif
|
|
|
|
#include "copy_template.S"
|
|
|
|
ENDPROC(arm_copy_to_user)
|
|
ENDPROC(__copy_to_user_std)
|
|
|
|
.pushsection .text.fixup,"ax"
|
|
.align 0
|
|
copy_abort_preamble
|
|
ldmfd sp!, {r1, r2, r3}
|
|
sub r0, r0, r1
|
|
rsb r0, r0, r2
|
|
copy_abort_end
|
|
.popsection
|