/usr/share/z88dk/lib/embedded_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 | ; Startup Code for Embedded Targets
;
; Daniel Wallner March 2002
;
; $Id: embedded_crt0.asm,v 1.3 2007/06/27 20:49:27 dom Exp $
;
; (DM) Could this do with a cleanup to ensure rstXX functions are
; available?
DEFC ROM_Start = $0000
DEFC RAM_Start = $8000
DEFC RAM_Length = $100
DEFC Stack_Top = $ffff
MODULE embedded_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 exitsp ;Pointer to atexit() stack
XDEF exitcount ;Number of atexit() functions registered
XDEF __sgoioblk ;std* control block
XDEF heaplast ;Near malloc heap variables
XDEF heapblocks ;
XDEF _vfprintf ;jp to printf() core routine
org ROM_Start
jp start
.start
; Make room for the atexit() stack
ld hl,Stack_Top-64
ld sp,hl
; Clear static memory
ld hl,RAM_Start
ld de,RAM_Start+1
ld bc,RAM_Length-1
ld (hl),0
ldir
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
ld hl,$8080
ld (fp_seed),hl
xor a
ld (exitcount),a
; Entry to the user code
call _main
.cleanup
;
; Deallocate memory which has been allocated here!
;
push hl
IF !DEFINED_nostreams
IF DEFINED_ANSIstdio
LIB closeall
call closeall
ENDIF
ENDIF
.endloop
jr endloop
.l_dcal
jp (hl)
;---------------------------------
; 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
; Static variables kept in safe workspace
DEFVARS RAM_Start
{
__sgoioblk ds.b 40 ;stdio control block
_std_seed ds.w 1 ;Integer seed
exitsp ds.w 1 ;atexit() stack
exitcount ds.b 1 ;Number of atexit() routines
fp_seed ds.w 3 ;Floating point seed (not used ATM)
extra ds.w 3 ;Floating point spare register
fa ds.w 3 ;Floating point accumulator
fasign ds.b 1 ;Floating point variable
heapblocks ds.w 1 ;Number of free blocks
heaplast ds.w 1 ;Pointer to linked blocks
}
;--------
; Now, include the math routines if needed..
;--------
IF NEED_floatpack
INCLUDE "#float.asm"
ENDIF
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