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forth: setup SYSVNXT in Forth code

This commit is contained in:
Virgil Dupras 2020-03-30 21:48:56 -04:00
parent e5ab0dd1c9
commit 031bfc6d72
3 changed files with 6 additions and 5 deletions
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BIN
emul/forth/z80c.bin
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4
forth/core.fs
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@ -116,6 +116,10 @@
2 50 @ +! 2 50 @ +!
; ;
( Set up initial SYSVNXT value, which is 2 bytes after its
own address )
50 @ DUP 2 + SWAP !
: ." : ."
LIT LIT
BEGIN BEGIN

7
forth/forth.asm
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@ -36,8 +36,7 @@
; that we can't compile a regular variable in it. SYSVNXT points to the next ; that we can't compile a regular variable in it. SYSVNXT points to the next
; free space in SYSVBUF. Then, at the word level, it's a regular sysvarWord. ; free space in SYSVBUF. Then, at the word level, it's a regular sysvarWord.
.equ SYSVNXT @+WORD_BUFSIZE .equ SYSVNXT @+WORD_BUFSIZE
.equ SYSVBUF @+2 .equ RAMEND @+SYSV_BUFSIZE+2
.equ RAMEND @+SYSV_BUFSIZE
; (HERE) usually starts at RAMEND, but in certain situations, such as in stage0, ; (HERE) usually starts at RAMEND, but in certain situations, such as in stage0,
; (HERE) will begin at a strategic place. ; (HERE) will begin at a strategic place.
@ -179,9 +178,6 @@ forthMain:
ld (CURRENT), hl ld (CURRENT), hl
ld hl, HERE_INITIAL ld hl, HERE_INITIAL
ld (HERE), hl ld (HERE), hl
; Set up SYSVNXT
ld hl, SYSVBUF
ld (SYSVNXT), hl
ld hl, .bootName ld hl, .bootName
call find call find
push de push de
@ -531,6 +527,7 @@ litWord:
ld (IP), hl ld (IP), hl
jp next jp next
.fill 6
; *** Dict hook *** ; *** Dict hook ***
; This dummy dictionary entry serves two purposes: ; This dummy dictionary entry serves two purposes:
; 1. Allow binary grafting. Because each binary dict always end with a dummy ; 1. Allow binary grafting. Because each binary dict always end with a dummy