| Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2004-2006 Atmel Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | #include <asm/errno.h> |
| 9 | #include <asm/asm.h> |
| 10 | |
| 11 | /* |
| 12 | * unsigned int csum_partial_copy_generic(const char *src, char *dst, int len |
| 13 | * int sum, int *src_err_ptr, |
| 14 | * int *dst_err_ptr) |
| 15 | * |
| 16 | * Copy src to dst while checksumming, otherwise like csum_partial. |
| 17 | */ |
| 18 | |
| 19 | .macro ld_src size, reg, ptr |
| 20 | 9999: ld.\size \reg, \ptr |
| 21 | .section __ex_table, "a" |
| 22 | .long 9999b, fixup_ld_src |
| 23 | .previous |
| 24 | .endm |
| 25 | |
| 26 | .macro st_dst size, ptr, reg |
| 27 | 9999: st.\size \ptr, \reg |
| 28 | .section __ex_table, "a" |
| 29 | .long 9999b, fixup_st_dst |
| 30 | .previous |
| 31 | .endm |
| 32 | |
| 33 | .text |
| 34 | .global csum_partial_copy_generic |
| 35 | .type csum_partial_copy_generic,"function" |
| 36 | .align 1 |
| 37 | csum_partial_copy_generic: |
| 38 | pushm r4-r7,lr |
| 39 | |
| 40 | /* The inner loop */ |
| 41 | 1: sub r10, 4 |
| 42 | brlt 5f |
| 43 | 2: ld_src w, r5, r12++ |
| 44 | st_dst w, r11++, r5 |
| 45 | add r9, r5 |
| 46 | acr r9 |
| 47 | sub r10, 4 |
| 48 | brge 2b |
| 49 | |
| 50 | /* return if we had a whole number of words */ |
| 51 | 5: sub r10, -4 |
| 52 | brne 7f |
| 53 | |
| 54 | 6: mov r12, r9 |
| 55 | popm r4-r7,pc |
| 56 | |
| 57 | /* handle additional bytes at the tail */ |
| 58 | 7: mov r5, 0 |
| 59 | mov r4, 32 |
| 60 | 8: ld_src ub, r6, r12++ |
| 61 | st_dst b, r11++, r6 |
| 62 | lsl r5, 8 |
| 63 | sub r4, 8 |
| 64 | bfins r5, r6, 0, 8 |
| 65 | sub r10, 1 |
| 66 | brne 8b |
| 67 | |
| 68 | lsl r5, r5, r4 |
| 69 | add r9, r5 |
| 70 | acr r9 |
| 71 | rjmp 6b |
| 72 | |
| 73 | /* Exception handler */ |
| 74 | .section .fixup,"ax" |
| 75 | .align 1 |
| 76 | fixup_ld_src: |
| 77 | mov r9, -EFAULT |
| 78 | cp.w r8, 0 |
| 79 | breq 1f |
| 80 | st.w r8[0], r9 |
| 81 | |
| 82 | 1: /* |
| 83 | * TODO: zero the complete destination - computing the rest |
| 84 | * is too much work |
| 85 | */ |
| 86 | |
| 87 | mov r9, 0 |
| 88 | rjmp 6b |
| 89 | |
| 90 | fixup_st_dst: |
| 91 | mov r9, -EFAULT |
| 92 | lddsp r8, sp[20] |
| 93 | cp.w r8, 0 |
| 94 | breq 1f |
| 95 | st.w r8[0], r9 |
| 96 | 1: mov r9, 0 |
| 97 | rjmp 6b |
| 98 | |
| 99 | .previous |