gbdk-2020 | GameBoy Development Kit |
| download: https://git.y1.nz/archives/gbdk.tar.gz | |
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gbdk-lib/libc/targets/sm83/hiramcpy.s
1 .include "global.s"
2
3 .area _HOME
4
5 _hiramcpy::
6 LDA HL,2(SP) ; Skip return address and registers
7 LD E,(HL) ; E = dst
8 LDA HL,5(SP)
9 LD A,(HL-)
10 LD D, A ; D = n
11 LD A,(HL-) ; HL = src
12 LD L,(HL)
13 LD H,A
14
15 ;; Copy memory zone to HIRAM
16 ;;
17 ;; Entry conditions
18 ;; E = destination
19 ;; D = length
20 ;; HL = source
21 ;;
22 ;; Preserves: BC
23 .hiramcpy::
24 LD A,E
25 LD E,C
26 LD C,A
27 1$:
28 LD A,(HL+)
29 LDH (C),A
30 INC C
31 DEC D
32 JR NZ,1$
33 LD C,E
34 RET
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