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Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
705 bytes
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| Line | |
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| 1 | .file "memcpy.S" |
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| 2 | |
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| 3 | .section .text |
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| 4 | .global _memcpy |
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| 5 | .type _memcpy,@function |
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| 6 | _memcpy: |
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| 7 | #ifdef __RX_DISALLOW_STRING_INSNS__ |
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| 8 | /* Do not use the string instructions - they might prefetch |
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| 9 | bytes from outside of valid memory. This is particularly |
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| 10 | dangerous in I/O space. */ |
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| 11 | |
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| 12 | ;; FIXME: It would be more space efficient to just branch to _memmove... |
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| 13 | |
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| 14 | cmp #0, r3 ; If the count is zero, do nothing |
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| 15 | beq 1f |
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| 16 | |
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| 17 | mov r1, r14 ; Save a copy of DEST |
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| 18 | |
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| 19 | 2: mov.b [r2+], r5 |
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| 20 | mov.b r5, [r14+] |
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| 21 | sub #1, r3 |
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| 22 | bne 2b |
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| 23 | |
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| 24 | 1: rts |
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| 25 | #else |
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| 26 | mov r1, r4 ; Save a copy of DEST |
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| 27 | smovf ; Copy R2 (source) to R1 (dest). Stop after R3 bytes. |
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| 28 | mov r4, r1 ; Return DEST |
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| 29 | rts |
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| 30 | #endif |
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| 31 | .size _memcpy, . - _memcpy |
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