git.sur5r.net Git - cc65/blob - libsrc/sim6502/crt0.s

   1 ;
   2 ; Oliver Schmidt, 2013-05-16
   3 ;
   4 ; Startup code for cc65 (sim6502 version)
   5 ;
   6
   7         .export         _exit
   8         .export         __STARTUP__ : absolute = 1      ; Mark as startup
   9         .import         zerobss, callmain
  10         .import         initlib, donelib
  11         .import         exit
  12         .import         __RAM_START__, __RAM_SIZE__     ; Linker generated
  13         .import         __STACKSIZE__                   ; Linker generated
  14
  15         .include        "zeropage.inc"
  16
  17         .segment        "STARTUP"
  18
  19         cld
  20         ldx     #$FF
  21         txs
  22         lda     #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
  23         ldx     #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
  24         sta     sp
  25         stx     sp+1
  26         jsr     zerobss
  27         jsr     initlib
  28         jsr     callmain
  29 _exit:  pha
  30         jsr     donelib
  31         pla
  32         jmp     exit