cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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copy_to_user.S (2398B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 *  linux/arch/arm/lib/copy_to_user.S
      4 *
      5 *  Author:	Nicolas Pitre
      6 *  Created:	Sep 29, 2005
      7 *  Copyright:	MontaVista Software, Inc.
      8 */
      9
     10#include <linux/linkage.h>
     11#include <asm/assembler.h>
     12#include <asm/unwind.h>
     13
     14/*
     15 * Prototype:
     16 *
     17 *	size_t arm_copy_to_user(void *to, const void *from, size_t n)
     18 *
     19 * Purpose:
     20 *
     21 *	copy a block to user memory from kernel memory
     22 *
     23 * Params:
     24 *
     25 *	to = user memory
     26 *	from = kernel memory
     27 *	n = number of bytes to copy
     28 *
     29 * Return value:
     30 *
     31 *	Number of bytes NOT copied.
     32 */
     33
     34#define LDR1W_SHIFT	0
     35
     36	.macro ldr1w ptr reg abort
     37	W(ldr) \reg, [\ptr], #4
     38	.endm
     39
     40	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
     41	ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
     42	.endm
     43
     44	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
     45	ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
     46	.endm
     47
     48	.macro ldr1b ptr reg cond=al abort
     49	ldrb\cond \reg, [\ptr], #1
     50	.endm
     51
     52#ifdef CONFIG_CPU_USE_DOMAINS
     53
     54#ifndef CONFIG_THUMB2_KERNEL
     55#define STR1W_SHIFT	0
     56#else
     57#define STR1W_SHIFT	1
     58#endif
     59
     60	.macro str1w ptr reg abort
     61	strusr	\reg, \ptr, 4, abort=\abort
     62	.endm
     63
     64	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
     65	str1w \ptr, \reg1, \abort
     66	str1w \ptr, \reg2, \abort
     67	str1w \ptr, \reg3, \abort
     68	str1w \ptr, \reg4, \abort
     69	str1w \ptr, \reg5, \abort
     70	str1w \ptr, \reg6, \abort
     71	str1w \ptr, \reg7, \abort
     72	str1w \ptr, \reg8, \abort
     73	.endm
     74
     75#else
     76
     77#define STR1W_SHIFT	0
     78
     79	.macro str1w ptr reg abort
     80	USERL(\abort, W(str) \reg, [\ptr], #4)
     81	.endm
     82
     83	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
     84	USERL(\abort, stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8})
     85	.endm
     86
     87#endif /* CONFIG_CPU_USE_DOMAINS */
     88
     89	.macro str1b ptr reg cond=al abort
     90	strusr	\reg, \ptr, 1, \cond, abort=\abort
     91	.endm
     92
     93	.macro enter regs:vararg
     94	mov	r3, #0
     95UNWIND( .save	{r0, r2, r3, \regs}		)
     96	stmdb	sp!, {r0, r2, r3, \regs}
     97	.endm
     98
     99	.macro exit regs:vararg
    100	add	sp, sp, #8
    101	ldmfd	sp!, {r0, \regs}
    102	.endm
    103
    104	.text
    105
    106ENTRY(__copy_to_user_std)
    107WEAK(arm_copy_to_user)
    108#ifdef CONFIG_CPU_SPECTRE
    109	ldr	r3, =TASK_SIZE
    110	uaccess_mask_range_ptr r0, r2, r3, ip
    111#endif
    112
    113#include "copy_template.S"
    114
    115ENDPROC(arm_copy_to_user)
    116ENDPROC(__copy_to_user_std)
    117
    118	.pushsection .text.fixup,"ax"
    119	.align 0
    120	copy_abort_preamble
    121	ldmfd	sp!, {r1, r2, r3}
    122	sub	r0, r0, r1
    123	rsb	r0, r0, r2
    124	copy_abort_end
    125	.popsection