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   1         ;; Generic crt0.s for a Z80
   2         .globl  _main
   3
   4         .area _HEADER (ABS)
   5         ;; Reset vector
   6         .org    0
   7         jp      init
   8
   9         .org    0x08
  10         reti
  11         .org    0x10
  12         reti
  13         .org    0x18
  14         reti
  15         .org    0x20
  16         reti
  17         .org    0x28
  18         reti
  19         .org    0x30
  20         reti
  21         .org    0x38
  22         reti
  23
  24         .org    0x100
  25 init:
  26         ;; Stack at the top of memory.
  27         ld      sp,#0xffff
  28
  29         ;; Initialise global variables
  30         call    gsinit
  31         call    _main
  32         jp      _exit
  33
  34         ;; Ordering of segments for the linker.
  35         .area   _CODE
  36         .area   _GSINIT
  37         .area   _GSFINAL
  38
  39         .area   _DATA
  40         .area   _BSS
  41
  42         .area   _CODE
  43 __clock::
  44         ld      a,#2
  45         out     (0xff),a
  46         ret
  47
  48 _getsp::
  49         ld      hl,#0
  50         add     hl,sp
  51         ret
  52
  53 __printTStates::
  54         ld      a,#3
  55         out     (0xff),a
  56         ret
  57
  58 _exit::
  59         ;; Exit - special code to the emulator
  60         ld      a,#0
  61         rst     0x08
  62 1$:
  63         halt
  64         jr      1$
  65
  66         .area   _GSINIT
  67 gsinit::
  68
  69         .area   _GSFINAL
  70         ret