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annotate libiram/bcopy_words.S @ 40:b56928f8c001

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doc/Firmware_Architecture: stale links to docs updated to new FTP and web locations
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 07 May 2017 16:20:07 +0000
parents 75a11d740a02
children
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75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * bcopy_aligned_words() takes the same arguments as BSD bcopy(),
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Mychaela Falconia <falcon@freecalypso.org>
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3 * but requires both addresses and the count to be 32-bit word-aligned,
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Mychaela Falconia <falcon@freecalypso.org>
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4 * and assumes that the source and destination memory regions
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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5 * do not overlap. Furthermore, the count is expected to be non-zero.
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Mychaela Falconia <falcon@freecalypso.org>
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6 *
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7 * Arguments:
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8 *
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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
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20 str r3, [r1], #4
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21 subs r2, r2, #4
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22 bhi 1b
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23 bx lr