/* 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 regs:vararg
        mov     r3, #0
UNWIND( .save   {r0, r2, r3, \regs}             )
        stmdb   sp!, {r0, r2, r3, \regs}
        .endm

        .macro exit regs:vararg
        add     sp, sp, #8
        ldmfd   sp!, {r0, \regs}
        .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