mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 07:26:44 +07:00
3fba7e23f7
Provide uaccess_save_and_enable() and uaccess_restore() to permit control of userspace visibility to the kernel, and hook these into the appropriate places in the kernel where we need to access userspace. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
110 lines
2.1 KiB
ArmAsm
110 lines
2.1 KiB
ArmAsm
/*
|
|
* linux/arch/arm/lib/copy_from_user.S
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Sep 29, 2005
|
|
* Copyright: MontaVista Software, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/unwind.h>
|
|
|
|
/*
|
|
* Prototype:
|
|
*
|
|
* size_t arm_copy_from_user(void *to, const void *from, size_t n)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* copy a block to kernel memory from user memory
|
|
*
|
|
* Params:
|
|
*
|
|
* to = kernel memory
|
|
* from = user memory
|
|
* n = number of bytes to copy
|
|
*
|
|
* Return value:
|
|
*
|
|
* Number of bytes NOT copied.
|
|
*/
|
|
|
|
#ifndef CONFIG_THUMB2_KERNEL
|
|
#define LDR1W_SHIFT 0
|
|
#else
|
|
#define LDR1W_SHIFT 1
|
|
#endif
|
|
#define STR1W_SHIFT 0
|
|
|
|
.macro ldr1w ptr reg abort
|
|
ldrusr \reg, \ptr, 4, abort=\abort
|
|
.endm
|
|
|
|
.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
|
|
ldr1w \ptr, \reg1, \abort
|
|
ldr1w \ptr, \reg2, \abort
|
|
ldr1w \ptr, \reg3, \abort
|
|
ldr1w \ptr, \reg4, \abort
|
|
.endm
|
|
|
|
.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
|
ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
|
|
ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
|
|
.endm
|
|
|
|
.macro ldr1b ptr reg cond=al abort
|
|
ldrusr \reg, \ptr, 1, \cond, abort=\abort
|
|
.endm
|
|
|
|
.macro str1w ptr reg abort
|
|
W(str) \reg, [\ptr], #4
|
|
.endm
|
|
|
|
.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
|
stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
|
|
.endm
|
|
|
|
.macro str1b ptr reg cond=al abort
|
|
str\cond\()b \reg, [\ptr], #1
|
|
.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(arm_copy_from_user)
|
|
|
|
#include "copy_template.S"
|
|
|
|
ENDPROC(arm_copy_from_user)
|
|
|
|
.pushsection .fixup,"ax"
|
|
.align 0
|
|
copy_abort_preamble
|
|
ldmfd sp!, {r1, r2}
|
|
sub r3, r0, r1
|
|
rsb r1, r3, r2
|
|
str r1, [sp]
|
|
bl __memzero
|
|
ldr r0, [sp], #4
|
|
copy_abort_end
|
|
.popsection
|
|
|