/usr/share/z88dk/lib/rel_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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | ; Startup stub for relocating (z88) programs
;
; This is untested, but should be okay
;
; Created 18/5/99 djm
;
; $Id: rel_crt0.asm,v 1.5 2007/06/27 20:49:28 dom Exp $
;-----------
; The .def files that we need here
;-----------
INCLUDE "#error.def"
INCLUDE "#stdio.def"
;-----------
; If we have an org then use it. But since we're relocating it's ignored
; failing that, default to 16384
;-----------
IF DEFINED_myzorg
org myzorg
ELSE
org 16384
ENDIF
org $2300
;-----------
; Code starts executing from here
;-----------
.start ld (start+1),sp ;Save starting stack
ld sp,($1ffe) ;Pick up stack from OZ safe place
ld hl,-64 ;Make room for the atexit() table
add hl,sp
ld sp,hl
ld (exitsp),sp
call doerrhan ;Initialise a laughable error handler
;-----------
; Initialise the (ANSI) stdio descriptors so we can be called agin
;-----------
IF DEFINED_ANSIstdio
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
call _main ;Run the program
.cleanup ;Jump back here from exit() if needed
IF DEFINED_ANSIstdio
LIB closeall
call closeall ;Close any open files (fopen)
ENDIF
call_oz(gn_nln) ;Print a new line
call resterrhan ;Restore the original error handler
.start1 ld sp,0 ;Restore stack to entry value
ret ;Out we go
;-----------
; Install the error handler
;-----------
.doerrhan
xor a
ld (exitcount),a
ld b,0
ld hl,errhand
call_oz(os_erh)
ld (l_erraddr),hl
ld (l_errlevel),a
ret
;-----------
; Restore BASICs error handler
;-----------
.resterrhan
ld hl,(l_erraddr)
ld a,(l_errlevel)
ld b,0
call_oz(os_erh)
.processcmd ;processcmd is called after os_tin
ld hl,0
ret
;-----------
; The error handler
;-----------
.errhand
ret z ;Fatal error
cp rc_esc
jr z,errescpressed
ld hl,(l_erraddr) ;Pass everything to BASIC's handler
scf
.l_dcal jp (hl) ;Used for function pointer calls also
.errescpressed
call_oz(os_esc) ;Acknowledge escape pressed
jr cleanup ;Exit the program
;-----------
; Select which vfprintf routine is needed
;-----------
._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
; We can't use far stuff with BASIC cos of paging issues so
; We assume all data is in fact near, so this is a dummy fn
; really
;-----------
; Far stuff can't be used with BASIC because of paging issues, so we assume
; that all data is near - this function is in fact a dummy and just adjusts
; the stack as required
;-----------
._cpfar2near
pop bc
pop hl
pop de
push bc
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
;-----------
; Now some variables
;-----------
.l_erraddr defw 0 ; BASIC error handler address
.l_errlevel defb 0 ; And error level
.coords defw 0 ; Current graphics xy coordinates
.base_graphics defw 0 ; Address of the Graphics map
.gfx_bank defb 0 ; And the bank
._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
.packintrout defw 0 ; Address of user interrupt routine
IF DEFINED_NEED1bitsound
.snd_asave defb 0 ; Sound variable
.snd_tick defb 0 ; " "
ENDIF
;-----------
; Unnecessary file signature
;-----------
defm "Small C+ z88"
defb 0
;-----------
; Floating point
;-----------
IF NEED_floatpack
INCLUDE "#float.asm"
.fp_seed defb $80,$80,0,0,0,0 ; FP seed (unused ATM)
.extra defs 6 ; Extra register temp store
.fa defs 6 ; ""
.fasign defb 0 ; ""
ENDIF
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