FreeCalypso > hg > freecalypso-sw
comparison gsm-fw/libiram/bcopy_words.S @ 860:cbc49d533b7d
gsm-fw: new implementation of bzero() and some specialized bcopy variants
| author | Space Falcon <falcon@ivan.Harhan.ORG> |
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| date | Sun, 03 May 2015 04:11:41 +0000 |
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| children |
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| 859:d32dff865575 | 860:cbc49d533b7d |
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| 1 /* | |
| 2 * bcopy_aligned_words() takes the same arguments as BSD bcopy(), | |
| 3 * but requires both addresses and the count to be 32-bit word-aligned, | |
| 4 * and assumes that the source and destination memory regions | |
| 5 * do not overlap. Furthermore, the count is expected to be non-zero. | |
| 6 * | |
| 7 * Arguments: | |
| 8 * | |
| 9 * R0: source address (word-aligned) | |
| 10 * R1: destination address (ditto) | |
| 11 * R2: byte count (must be a multiple of 4) | |
| 12 */ | |
| 13 | |
| 14 .text | |
| 15 .code 32 | |
| 16 | |
| 17 .globl bcopy_aligned_words | |
| 18 bcopy_aligned_words: | |
| 19 1: ldr r3, [r0], #4 | |
| 20 str r3, [r1], #4 | |
| 21 subs r2, r2, #4 | |
| 22 bhi 1b | |
| 23 bx lr |