Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  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.

 *

 * 27/03/03 Ian Molton Clean up CONFIG_CPU

 *

 */

#include 

#include 

#include 

#include 

                .text

                .macro  save_regs

                mov     ip, sp

                stmfd   sp!, {r1 - r2, r4 - r8, fp, ip, lr, pc}

                sub     fp, ip, #4

                .endm

                .macro  load_regs

                ldmfd   sp, {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

/*

 * 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.

 */

                .section .fixup,"ax"

                .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

                .previous