FreeCalypso > hg > freecalypso-sw
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gsm-fw/libiram/bcopy_words.S Sun May 03 04:11:41 2015 +0000 @@ -0,0 +1,23 @@ +/* + * bcopy_aligned_words() takes the same arguments as BSD bcopy(), + * but requires both addresses and the count to be 32-bit word-aligned, + * and assumes that the source and destination memory regions + * do not overlap. Furthermore, the count is expected to be non-zero. + * + * Arguments: + * + * R0: source address (word-aligned) + * R1: destination address (ditto) + * R2: byte count (must be a multiple of 4) + */ + + .text + .code 32 + + .globl bcopy_aligned_words +bcopy_aligned_words: +1: ldr r3, [r0], #4 + str r3, [r1], #4 + subs r2, r2, #4 + bhi 1b + bx lr