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100 lines
1.7 KiB
ArmAsm
100 lines
1.7 KiB
ArmAsm
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/*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/errno.h>
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#include <asm/asm.h>
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/*
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* unsigned int csum_partial_copy_generic(const char *src, char *dst, int len
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* int sum, int *src_err_ptr,
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* int *dst_err_ptr)
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*
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* Copy src to dst while checksumming, otherwise like csum_partial.
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*/
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.macro ld_src size, reg, ptr
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9999: ld.\size \reg, \ptr
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.section __ex_table, "a"
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.long 9999b, fixup_ld_src
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.previous
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.endm
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.macro st_dst size, ptr, reg
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9999: st.\size \ptr, \reg
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.section __ex_table, "a"
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.long 9999b, fixup_st_dst
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.previous
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.endm
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.text
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.global csum_partial_copy_generic
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.type csum_partial_copy_generic,"function"
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.align 1
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csum_partial_copy_generic:
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pushm r4-r7,lr
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/* The inner loop */
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1: sub r10, 4
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brlt 5f
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2: ld_src w, r5, r12++
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st_dst w, r11++, r5
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add r9, r5
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acr r9
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sub r10, 4
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brge 2b
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/* return if we had a whole number of words */
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5: sub r10, -4
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brne 7f
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6: mov r12, r9
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popm r4-r7,pc
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/* handle additional bytes at the tail */
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7: mov r5, 0
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mov r4, 32
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8: ld_src ub, r6, r12++
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st_dst b, r11++, r6
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lsl r5, 8
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sub r4, 8
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bfins r5, r6, 0, 8
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sub r10, 1
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brne 8b
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lsl r5, r5, r4
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add r9, r5
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acr r9
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rjmp 6b
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/* Exception handler */
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.section .fixup,"ax"
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.align 1
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fixup_ld_src:
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mov r9, -EFAULT
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cp.w r8, 0
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breq 1f
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st.w r8[0], r9
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1: /*
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* TODO: zero the complete destination - computing the rest
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* is too much work
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*/
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mov r9, 0
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rjmp 6b
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fixup_st_dst:
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mov r9, -EFAULT
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lddsp r8, sp[20]
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cp.w r8, 0
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breq 1f
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st.w r8[0], r9
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1: mov r9, 0
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rjmp 6b
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.previous
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