FreeCalypso > hg > freecalypso-sw
comparison gsm-fw/libiram/bcopy_chunk32.S @ 860:cbc49d533b7d
gsm-fw: new implementation of bzero() and some specialized bcopy variants
| author | Space Falcon <falcon@ivan.Harhan.ORG> |
|---|---|
| date | Sun, 03 May 2015 04:11:41 +0000 |
| parents | |
| children |
comparison
equal
deleted
inserted
replaced
| 859:d32dff865575 | 860:cbc49d533b7d |
|---|---|
| 1 /* | |
| 2 * bcopy_32byte_chunks() takes the same arguments as BSD bcopy(), | |
| 3 * but works on large chunks, specifically: | |
| 4 * | |
| 5 * - both addresses must be 32-bit word-aligned; | |
| 6 * - the count must be a non-zero multiple of 32 bytes; | |
| 7 * - the source and destination memory regions must not overlap. | |
| 8 * | |
| 9 * Arguments: | |
| 10 * | |
| 11 * R0: source address (word-aligned) | |
| 12 * R1: destination address (ditto) | |
| 13 * R2: byte count (must be a multiple of 32) | |
| 14 */ | |
| 15 | |
| 16 .text | |
| 17 .code 32 | |
| 18 | |
| 19 .globl bcopy_32byte_chunks | |
| 20 bcopy_32byte_chunks: | |
| 21 stmfd sp!, {r4-r9} | |
| 22 1: ldmia r0!, {r3-r9,r12} | |
| 23 stmia r1!, {r3-r9,r12} | |
| 24 subs r2, r2, #0x20 | |
| 25 bhi 1b | |
| 26 ldmfd sp!, {r4-r9} | |
| 27 bx lr |