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81 lines
4.1 KiB
Plaintext
81 lines
4.1 KiB
Plaintext
ASxxxx Assembler V02.00 + NoICE + SDCC mods (Zilog Z80 / Hitachi HD64180 / ZX-Next / eZ80), page 1.
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Hexadecimal [24-Bits]
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1 ; crt0.s for ZX Spectrum
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2
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3 .module crt0
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4 .globl _main
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5 .globl ___sdcc_call_hl
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6 .globl l__DATA
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7 .globl s__DATA
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8 .globl s__INITIALIZED
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9 .globl s__INITIALIZER
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10 .globl l__INITIALIZER
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11
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12 ; Ordering of segments for the linker - copied from sdcc crt0.s
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13 .area _CODE
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14 .area _INITIALIZER
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15 .area _HOME
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16 .area _GSINIT
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17 .area _GSFINAL
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18 .area _DATA
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19 .area _INITIALIZED
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20 .area _BSEG
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21 .area _BSS
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22 .area _HEAP
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23
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24 .area _CODE
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25
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000000 26 _Start:
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27 ;di
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28 ;im 1
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29 ; stack pointer already set by BIOS
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000000 CD 00 00 [17] 30 call gsinit ; Initialize global and static variables.
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000003 CD 00 00 [17] 31 call _main
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000006 C7 [11] 32 rst 0x0 ; Restart when main() returns.
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33
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34 .area _GSINIT
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000000 35 gsinit::
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36
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37 ; Implicitly zeroed global and static variables.
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000000 01 00 00 [10] 38 ld bc, #l__DATA
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000003 78 [ 4] 39 ld a, b
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000004 B1 [ 4] 40 or a, c
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000005 28 0F [12] 41 jr Z, zeroed_data
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000007 21 00 00 [10] 42 ld hl, #s__DATA
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00000A 36 00 [10] 43 ld (hl), #0x00
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00000C 0B [ 6] 44 dec bc
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00000D 78 [ 4] 45 ld a, b
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00000E B1 [ 4] 46 or a, c
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00000F 28 05 [12] 47 jr Z, zeroed_data
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000011 5D [ 4] 48 ld e, l
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000012 54 [ 4] 49 ld d, h
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000013 13 [ 6] 50 inc de
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000014 ED B0 [21] 51 ldir
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000016 52 zeroed_data:
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53
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54 ; Explicitly initialized global variables.
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000016 01 00 00 [10] 55 ld bc, #l__INITIALIZER
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ASxxxx Assembler V02.00 + NoICE + SDCC mods (Zilog Z80 / Hitachi HD64180 / ZX-Next / eZ80), page 2.
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Hexadecimal [24-Bits]
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000019 78 [ 4] 56 ld a, b
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00001A B1 [ 4] 57 or a, c
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00001B 28 08 [12] 58 jr Z, gsinit_static
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00001D 11 00 00 [10] 59 ld de, #s__INITIALIZED
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000020 21 00 00 [10] 60 ld hl, #s__INITIALIZER
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000023 ED B0 [21] 61 ldir
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62
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000025 63 gsinit_static:
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64 ; Explicitly initialized static variables inserted by compiler here.
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65
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66 .area _GSFINAL
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000000 C9 [10] 67 ret
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68
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69 .area _HOME
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70
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