/usr/share/z88dk/lib/nascom_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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | ; CRT0 for the NASCOM1/2
;
; Stefano Bodrato May 2003
;
;
; - - - - - - -
;
; $Id: nascom_crt0.asm,v 1.5 2007/06/27 20:49:27 dom Exp $
;
; - - - - - - -
MODULE nascom_crt0
;-------
; Include zcc_opt.def to find out information about us
;-------
INCLUDE "zcc_opt.def"
;-------
; Some general scope declarations
;-------
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 __sgoioblk ;stdio info block
XDEF heaplast ;Near malloc heap variables
XDEF heapblocks
XDEF base_graphics ;Graphical variables (useless with NASCOM)
XDEF coords ;Current xy position
XDEF montest ;NASCOM: check the monitor type
org C80h
;org E000h
; NASSYS1..NASSYS3
; IF (startup=1) | (startup=2) | (startup=3)
;
;
; ENDIF
.start
ld (start1+1),sp ;Save entry stack
; search for the top of writeble memory and set the stack pointer
ld hl,ffffh
ld a,55
.stackloop
ld (hl),a
cp (hl)
dec hl
jr nz,stackloop
ld sp,hl
ld (exitsp),sp
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!
;
push hl
IF !DEFINED_nostreams
IF DEFINED_ANSIstdio
LIB closeall
call closeall
ENDIF
ENDIF
pop bc
.start1 ld sp,0 ;Restore stack to entry value
rst 18h
defb 5bh
;ret
.l_dcal jp (hl) ;Used for function pointer calls
jp (hl)
;------------------------------------
; Check which monitor we have in ROM
;------------------------------------
montest: ld a,(1) ; "T" monitor or NAS-SYS?
cp 33h ; 31 00 10 / 31 33 0C
ret
;-----------
; 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
;-----------
; 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
defm "Small C+ NASCOM" ;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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