git.gag.com Git - fw/sdcc/blob - device/lib/gbz80/crt0.s

   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         jp      0x150
  26
  27         .org    0x150
  28 init:
  29         di
  30         ;; Stack at the top of memory.
  31         ld      sp,#0xdfff
  32
  33         ;; Use _main instead of main to bypass sdcc's intelligence
  34         call    __main
  35         jp      _exit
  36
  37         ;; Ordering of segments for the linker.
  38         .area   _CODE
  39         .area   _DATA
  40
  41 __clock::
  42         ld      a,#2
  43         rst     0x00
  44         ret
  45
  46 _getsp::
  47         ld      hl,#0
  48         add     hl,sp
  49         ret
  50
  51 __printTStates::
  52         ld      a,#3
  53         rst     0x00
  54         ret
  55
  56 _exit::
  57         ;; Exit - special code to the emulator
  58         ld      a,#1
  59         rst     0x00
  60 1$:
  61         halt
  62         jr      1$