FreeCalypso > hg > freecalypso-citrine
comparison libiram/bcopy_chunk32.S @ 0:75a11d740a02
initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
| author | Mychaela Falconia <falcon@freecalypso.org> |
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| date | Thu, 09 Jun 2016 00:02:41 +0000 |
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| children |
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| -1:000000000000 | 0:75a11d740a02 |
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| 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 |