/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  linux/arch/arm/lib/csumpartialcopyuser.S
 *
 *  Copyright (C) 1995-1998 Russell King
 *
 * 27/03/03 Ian Molton Clean up CONFIG_CPU
 */
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/errno.h>
#include <asm/asm-offsets.h>

                .text

#if defined(CONFIG_CPU_SW_DOMAIN_PAN)

                .macro  save_regs
                mrc     p15, 0, ip, c3, c0, 0
                stmfd   sp!, {r1, r2, r4 - r8, ip, lr}
                uaccess_enable ip
                .endm

                .macro  load_regs
                ldmfd   sp!, {r1, r2, r4 - r8, ip, lr}
                mcr     p15, 0, ip, c3, c0, 0
                ret     lr
                .endm

#elif defined(CONFIG_CPU_TTBR0_PAN)

                .macro  save_regs
                mrc     p15, 0, ip, c2, c0, 2           @ read TTBCR
                stmfd   sp!, {r1, r2, r4 - r8, ip, lr}
                uaccess_enable ip
                .endm

                .macro  load_regs
                ldmfd   sp!, {r1, r2, r4 - r8, ip, lr}
                mcr     p15, 0, ip, c2, c0, 2           @ restore TTBCR
                ret     lr
                .endm

#else

                .macro  save_regs
                stmfd   sp!, {r1, r2, r4 - r8, lr}
                .endm

                .macro  load_regs
                ldmfd   sp!, {r1, r2, r4 - r8, pc}
                .endm

#endif

                .macro  load1b, reg1
                ldrusr  \reg1, r0, 1
                .endm

                .macro  load2b, reg1, reg2
                ldrusr  \reg1, r0, 1
                ldrusr  \reg2, r0, 1
                .endm

                .macro  load1l, reg1
                ldrusr  \reg1, r0, 4
                .endm

                .macro  load2l, reg1, reg2
                ldrusr  \reg1, r0, 4
                ldrusr  \reg2, r0, 4
                .endm

                .macro  load4l, reg1, reg2, reg3, reg4
                ldrusr  \reg1, r0, 4
                ldrusr  \reg2, r0, 4
                ldrusr  \reg3, r0, 4
                ldrusr  \reg4, r0, 4
                .endm

/*
 * unsigned int
 * csum_partial_copy_from_user(const char *src, char *dst, int len)
 *  r0 = src, r1 = dst, r2 = len
 *  Returns : r0 = checksum or 0
 */

#define FN_ENTRY        ENTRY(csum_partial_copy_from_user)
#define FN_EXIT         ENDPROC(csum_partial_copy_from_user)

#include "csumpartialcopygeneric.S"

/*
 * We report fault by returning 0 csum - impossible in normal case, since
 * we start with 0xffffffff for initial sum.
 */
                .pushsection .text.fixup,"ax"
                .align  4
9001:           mov     r0, #0
                load_regs
                .popsection