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/*
 *  linux/arch/arm/lib/csumpartialcopyuser.S
 *
 *  Copyright (C) 1995-1998 Russell King
 *
 * 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/config.h>
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/errno.h>
#include <asm/constants.h>

                .text

#if defined(CONFIG_CPU_32)

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

                .macro  load_regs,flags
                ldm\flags       fp, {r1, r2, r4-r8, fp, sp, pc}
                .endm

                .macro  load1b, reg1
9999:           ldrbt   \reg1, [r0], $1
                .section __ex_table, "a"
                .align  3
                .long   9999b, 6001f
                .previous
                .endm

                .macro  load2b, reg1, reg2
9999:           ldrbt   \reg1, [r0], $1
9998:           ldrbt   \reg2, [r0], $1
                .section __ex_table, "a"
                .long   9999b, 6001f
                .long   9998b, 6001f
                .previous
                .endm

                .macro  load1l, reg1
9999:           ldrt    \reg1, [r0], $4
                .section __ex_table, "a"
                .align  3
                .long   9999b, 6001f
                .previous
                .endm

                .macro  load2l, reg1, reg2
9999:           ldrt    \reg1, [r0], $4
9998:           ldrt    \reg2, [r0], $4
                .section __ex_table, "a"
                .long   9999b, 6001f
                .long   9998b, 6001f
                .previous
                .endm

                .macro  load4l, reg1, reg2, reg3, reg4
9999:           ldrt    \reg1, [r0], $4
9998:           ldrt    \reg2, [r0], $4
9997:           ldrt    \reg3, [r0], $4
9996:           ldrt    \reg4, [r0], $4
                .section __ex_table, "a"
                .long   9999b, 6001f
                .long   9998b, 6001f
                .long   9997b, 6001f
                .long   9996b, 6001f
                .previous
                .endm

#elif defined(CONFIG_CPU_26)

                .macro  save_regs
                stmfd   sp!, {r1 - r2, r4 - r9, fp, ip, lr, pc}
                mov     r9, sp, lsr #13
                mov     r9, r9, lsl #13
                ldr     r9, [r9, #TSK_ADDR_LIMIT]
                mov     r9, r9, lsr #24
                .endm

                .macro  load_regs,flags
                ldm\flags       fp, {r1, r2, r4-r9, fp, sp, pc}^
                .endm

                .macro  load1b, reg1
                tst     r9, #0x01
9999:           ldreqbt \reg1, [r0], #1
                ldrneb  \reg1, [r0], #1
                .section __ex_table, "a"
                .align  3
                .long   9999b, 6001f
                .previous
                .endm

                .macro  load2b, reg1, reg2
                tst     r9, #0x01
9999:           ldreqbt \reg1, [r0], #1
                ldrneb  \reg1, [r0], #1
9998:           ldreqbt \reg2, [r0], #1
                ldrneb  \reg2, [r0], #1
                .section __ex_table, "a"
                .long   9999b, 6001f
                .long   9998b, 6001f
                .previous
                .endm

                .macro  load1l, reg1
                tst     r9, #0x01
9999:           ldreqt  \reg1, [r0], #4
                ldrne   \reg1, [r0], #4
                .section __ex_table, "a"
                .align  3
                .long   9999b, 6001f
                .previous
                .endm

                .macro  load2l, reg1, reg2
                tst     r9, #0x01
                ldmneia r0!, {\reg1, \reg2}
9999:           ldreqt  \reg1, [r0], #4
9998:           ldreqt  \reg2, [r0], #4
                .section __ex_table, "a"
                .long   9999b, 6001f
                .long   9998b, 6001f
                .previous
                .endm

                .macro  load4l, reg1, reg2, reg3, reg4
                tst     r9, #0x01
                ldmneia r0!, {\reg1, \reg2, \reg3, \reg4}
9999:           ldreqt  \reg1, [r0], #4
9998:           ldreqt  \reg2, [r0], #4
9997:           ldreqt  \reg3, [r0], #4
9996:           ldreqt  \reg4, [r0], #4
                .section __ex_table, "a"
                .long   9999b, 6001f
                .long   9998b, 6001f
                .long   9997b, 6001f
                .long   9996b, 6001f
                .previous
                .endm

#else
#error Unknown CPU architecture
#endif

/*
 * unsigned int
 * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
 *  r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
 *  Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
 */

#define FN_ENTRY        ENTRY(csum_partial_copy_from_user)

#include "csumpartialcopygeneric.S"

/*
 * FIXME: minor buglet here
 * We don't return the checksum for the data present in the buffer.  To do
 * so properly, we would have to add in whatever registers were loaded before
 * the fault, which, with the current asm above is not predictable.
 */
#if defined(CONFIG_CPU_32)
                .section .fixup,"ax"
#endif
                .align  4
6001:           mov     r4, #-EFAULT
                ldr     r5, [fp, #4]            @ *err_ptr
                str     r4, [r5]
                ldmia   sp, {r1, r2}            @ retrieve dst, len
                add     r2, r2, r1
                mov     r0, #0                  @ zero the buffer
6002:           teq     r2, r1
                strneb  r0, [r1], #1
                bne     6002b
                load_regs       ea
#if defined(CONFIG_CPU_32)
                .previous
#endif