/usr/share/z88dk/lib/newbrain_crt0.asm is in z88dk-data 1.8.ds1-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; Grundy NewBrain startup code
;
;
; $Id: newbrain_crt0.asm,v 1.5 2007/06/27 20:49:27 dom Exp $
;
MODULE newbrain_crt0
;--------
; Include zcc_opt.def to find out some info
;--------
INCLUDE "zcc_opt.def"
;--------
; Some scope definitions
;--------
XREF _main ;main() is always external to crt0 code
XDEF cleanup ;jp'd to by exit()
XDEF l_dcal ;jp(hl)
XDEF _std_seed ;Integer rand() seed
XDEF _vfprintf ;jp to the printf() core
XDEF exitsp ;atexit() variables
XDEF exitcount
XDEF heaplast ;Near malloc heap variables
XDEF heapblocks
XDEF __sgoioblk ;stdio info block
XDEF base_graphics ;Graphical variables
XDEF coords ;Current xy position
XDEF snd_tick ;Sound variable
XDEF nbclockptr ;ptr to clock counter location
IF (startup=2)
XDEF oldintaddr ;made available to chain an interrupt handler
ENDIF
IF !myzorg
defc myzorg = 10000
ENDIF
org myzorg
.start
ld (start1+1),sp ;Save entry stack
ld hl,-64
add hl,sp
ld sp,hl
ld (exitsp),sp
IF (startup=2)
ld hl,(57)
ld (oldintaddr),hl
ld hl,nbckcount
ld (57),hl
ENDIF
IF !DEFINED_nostreams
IF DEFINED_ANSIstdio
; Set up the std* stuff so we can be called again
ld hl,__sgoioblk+2
ld (hl),19 ;stdin
ld hl,__sgoioblk+6
ld (hl),21 ;stdout
ld hl,__sgoioblk+10
ld (hl),21 ;stderr
ENDIF
ENDIF
call _main ;Call user program
.cleanup
;
; Deallocate memory which has been allocated here!
;
IF !DEFINED_nostreams
IF DEFINED_ANSIstdio
LIB closeall
call closeall
ENDIF
ENDIF
IF (startup=2)
ld hl,(oldintaddr)
ld (57),hl
ENDIF
.cleanup_exit
.start1 ld sp,0 ;Restore stack to entry value
ret
.l_dcal jp (hl) ;Used for function pointer calls
;-----------
; Define the stdin/out/err area. For the z88 we have two models - the
; classic (kludgey) one and "ANSI" model
;-----------
.__sgoioblk
IF DEFINED_ANSIstdio
INCLUDE "#stdio_fp.asm"
ELSE
defw -11,-12,-10
ENDIF
;---------------------------------
; Select which printf core we want
;---------------------------------
._vfprintf
IF DEFINED_floatstdio
LIB vfprintf_fp
jp vfprintf_fp
ELSE
IF DEFINED_complexstdio
LIB vfprintf_comp
jp vfprintf_comp
ELSE
IF DEFINED_ministdio
LIB vfprintf_mini
jp vfprintf_mini
ENDIF
ENDIF
ENDIF
;-----------
; Grundy NewBrain clock handler.
; an interrupt handler could chain the "oldintaddr" value.
;-----------
IF (startup=2)
.nbclockptr defw $52 ; ROM routine
; Useless custom clock counter (we have the ROM one).
;
;.nbclockptr defw nbclock
;
.nbckcount
; push af
; push hl
; ld hl,(nbclock)
; inc hl
; ld (nbclock),hl
; ld a,h
; or l
; jr nz,nomsb
; ld hl,(nbclock_m)
; inc hl
; ld (nbclock_m),hl
;.nomsb pop hl
; pop af
defb 195 ; JP
.oldintaddr defw 0
.nbclock defw 0 ; NewBrain Clock
.nbclock_m defw 0
ELSE
.nbclockptr defb $52 ; paged system clock counter
ENDIF
;-----------
; Now some variables
;-----------
.coords defw 0 ; Current graphics xy coordinates
.base_graphics defw 0 ; Address of the Graphics map
._std_seed defw 0 ; Seed for integer rand() routines
.exitsp defw 0 ; Address of where the atexit() stack is
.exitcount defb 0 ; How many routines on the atexit() stack
.heaplast defw 0 ; Address of last block on heap
.heapblocks defw 0 ; Number of blocks
IF DEFINED_NEED1bitsound
.snd_tick defb 0 ; Sound variable
ENDIF
defm "Small C+ NewBrain" ;Unnecessary file signature
defb 0
;-----------------------
; Floating point support
;-----------------------
IF NEED_floatpack
INCLUDE "#float.asm"
.fp_seed defb $80,$80,0,0,0,0 ;FP seed (unused ATM)
.extra defs 6 ;FP register
.fa defs 6 ;FP Accumulator
.fasign defb 0 ;FP register
ENDIF
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