collapseos/tools/emul/zasm/glue.asm

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; Glue code for the emulated environment
.equ RAMSTART 0x4000
.equ USER_CODE 0x4800
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.equ STDIO_PORT 0x00
.equ STDIN_SEEK 0x01
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.equ FS_DATA_PORT 0x02
.equ FS_SEEK_PORT 0x03
.equ STDERR_PORT 0x04
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jp init ; 3 bytes
; *** JUMP TABLE ***
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jp strncmp
jp addDE
jp addHL
jp upcase
jp unsetZ
jp intoDE
jp intoHL
jp writeHLinDE
jp findchar
jp parseHex
jp parseHexPair
jp blkSel
jp blkSet
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jp fsFindFN
jp fsOpen
jp fsGetC
jp cpHLDE
jp parseArgs
jp _blkGetC
jp _blkPutC
jp _blkSeek
jp _blkTell
jp printstr
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#include "core.asm"
#include "err.h"
#include "parse.asm"
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.equ BLOCKDEV_RAMSTART RAMSTART
.equ BLOCKDEV_COUNT 3
#include "blockdev.asm"
; List of devices
.dw emulGetC, unsetZ
.dw unsetZ, emulPutC
.dw fsdevGetC, fsdevPutC
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
#include "stdio.asm"
.equ FS_RAMSTART STDIO_RAMEND
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.equ FS_HANDLE_COUNT 0
#include "fs.asm"
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init:
di
ld hl, 0xffff
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ld sp, hl
ld hl, unsetZ
ld de, stderrPutC
call stdioInit
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ld a, 2 ; select fsdev
ld de, BLOCKDEV_SEL
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call blkSel
call fsOn
ld hl, .zasmArgs
call USER_CODE
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; signal the emulator we're done
halt
.zasmArgs:
.db "0 1", 0
; *** I/O ***
emulGetC:
; the STDIN_SEEK port works by poking it twice. First poke is for high
; byte, second poke is for low one.
ld a, h
out (STDIN_SEEK), a
ld a, l
out (STDIN_SEEK), a
in a, (STDIO_PORT)
or a ; cp 0
jr z, .eof
cp a ; ensure z
ret
.eof:
call unsetZ
ret
emulPutC:
out (STDIO_PORT), a
cp a ; ensure Z
ret
stderrPutC:
out (STDERR_PORT), a
cp a ; ensure Z
ret
fsdevGetC:
ld a, e
out (FS_SEEK_PORT), a
ld a, h
out (FS_SEEK_PORT), a
ld a, l
out (FS_SEEK_PORT), a
in a, (FS_SEEK_PORT)
or a
ret nz
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in a, (FS_DATA_PORT)
cp a ; ensure Z
ret
fsdevPutC:
push af
ld a, e
out (FS_SEEK_PORT), a
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ld a, h
out (FS_SEEK_PORT), a
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ld a, l
out (FS_SEEK_PORT), a
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in a, (FS_SEEK_PORT)
or a
jr nz, .error
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pop af
out (FS_DATA_PORT), a
cp a ; ensure Z
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ret
.error:
pop af
jp unsetZ ; returns
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