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annotate gsm-fw/libiram/bcopy_words.S @ 1023:cd6002e3aefb

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doc/Freerunner-Howto: apparently some people still use SHR, so mention it too
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Tue, 03 May 2016 13:48:39 +0000
parents cbc49d533b7d
children
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cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
Space Falcon <falcon@ivan.Harhan.ORG>
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1 /*
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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2 * bcopy_aligned_words() takes the same arguments as BSD bcopy(),
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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3 * but requires both addresses and the count to be 32-bit word-aligned,
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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4 * and assumes that the source and destination memory regions
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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5 * do not overlap. Furthermore, the count is expected to be non-zero.
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6 *
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7 * Arguments:
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8 *
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9 * R0: source address (word-aligned)
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10 * R1: destination address (ditto)
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11 * R2: byte count (must be a multiple of 4)
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12 */
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13
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14 .text
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15 .code 32
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16
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17 .globl bcopy_aligned_words
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18 bcopy_aligned_words:
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19 1: ldr r3, [r0], #4
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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20 str r3, [r1], #4
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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21 subs r2, r2, #4
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
Space Falcon <falcon@ivan.Harhan.ORG>
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22 bhi 1b
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23 bx lr