forth: make prev word field relative
This should help with upcoming challenges in bootstrapping z80 code compiled through Forth.
This commit is contained in:
Virgil Dupras
parent
00de336976
commit
ffe61a12f8
@ -7,7 +7,7 @@ AVRABIN = zasm/avra
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SHELLAPPS = zasm ed
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SHELLTGTS = ${SHELLAPPS:%=cfsin/%}
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# Those Forth source files are in a particular order
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FORTHSRCS = core.fs str.fs parse.fs readln.fs fmt.fs high.fs z80a.fs
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FORTHSRCS = core.fs str.fs parse.fs readln.fs fmt.fs high.fs z80a.fs dummy.fs
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FORTHSRC_PATHS = ${FORTHSRCS:%=../forth/%}
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CFSIN_CONTENTS = $(SHELLTGTS) cfsin/user.h
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OBJS = emul.o libz80/libz80.o
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@ -34,6 +34,6 @@ emulPutC:
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out (STDIO_PORT), a
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ret
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.dw 0 ; placeholder used in glue1.
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CODE_END:
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.out LATEST
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.out $ ; should be the same as in glue1
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@ -1,6 +1,6 @@
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; Warning: The offsets of native dict entries must be exactly the same between
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; glue0.asm and glue1.asm
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.equ LATEST CODE_END ; override
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.equ LATEST RAMSTART ; override
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.equ STDIO_PORT 0x00
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jp init
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@ -26,9 +26,6 @@ emulPutC:
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out (STDIO_PORT), a
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ret
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.out $ ; should be the same as in glue0, minus 2
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; stage0 spits, at the beginning of the binary, the address of the latest word
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; Therefore, we can set the LATEST label to here and we should be good.
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CODE_END:
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.out $ ; should be the same as in glue0
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.bin "core.bin"
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RAMSTART:
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@ -71,9 +71,6 @@ int main(int argc, char *argv[])
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#ifndef DEBUG
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// We're done, now let's spit dict data
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// let's start with LATEST spitting.
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putchar(m->mem[CURRENT]);
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putchar(m->mem[CURRENT+1]);
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uint16_t here = m->mem[HERE] + (m->mem[HERE+1] << 8);
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for (int i=sizeof(KERNEL); i<here; i++) {
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putchar(m->mem[i]);
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4
forth/dummy.fs
Normal file
4
forth/dummy.fs
Normal file
@ -0,0 +1,4 @@
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( When building a compiled dict, always include this unit at
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the end of it so that Forth knows how to hook LATEST into
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it )
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WORD _______ (entry)
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180
forth/forth.asm
180
forth/forth.asm
@ -119,12 +119,10 @@ forthMain:
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push af \ push af \ push af
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ld (INITIAL_SP), sp
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ld ix, RS_ADDR
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; LATEST is a *indirect* label to the latest entry of the dict. See
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; default at the bottom of dict.asm. This indirection allows us to
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; override latest to a value set in a binary dict compiled separately,
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; for example by the stage0 bin.
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; LATEST is a label to the latest entry of the dict. This can be
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; overridden if a binary dict has been grafted to the end of this
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; binary
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ld hl, LATEST
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call intoHL
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ld (CURRENT), hl
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ld hl, HERE_INITIAL
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ld (HERE), hl
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@ -416,9 +414,12 @@ find:
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call strncmp
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pop de ; <-- lvl 1, return to wordref
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jr z, .end ; found
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push hl ; .prev destroys HL
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call .prev
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pop hl
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jr nz, .inner
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; Z set? end of dict unset Z
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xor a
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inc a
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.end:
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pop bc
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@ -429,15 +430,21 @@ find:
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; Z is set if DE point to 0 (no entry). NZ if not.
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.prev:
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dec de \ dec de \ dec de ; prev field
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push de ; --> lvl 1
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ex de, hl
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call intoHL
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ex de, hl ; de preserved by intoHL, so no push/pop needed
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; DE points to prev. Is it zero?
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xor a
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or d
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ex de, hl ; DE contains prev offset
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pop hl ; <-- lvl 1
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; HL is prev field's addr
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; Is offset zero?
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ld a, d
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or e
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; Z will be set if DE is zero
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ret
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ret z ; no prev entry
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; get absolute addr from offset
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; carry cleared from "or e"
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sbc hl, de
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ex de, hl ; result in DE
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ret ; NZ set from SBC
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; Checks flags Z and S and sets BC to 0 if Z, 1 if C and -1 otherwise
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flagsToBC:
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@ -519,11 +526,14 @@ chkPS:
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; It's important that this part is at the end of the resulting binary.
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; A dictionary entry has this structure:
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; - 7b name (zero-padded)
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; - 2b prev pointer
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; - 2b prev offset
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; - 1b flags (bit 0: IMMEDIATE)
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; - 2b code pointer
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; - Parameter field (PF)
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;
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; The prev offset is the number of bytes between the prev field and the
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; previous word's code pointer.
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;
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; The code pointer point to "word routines". These routines expect to be called
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; with IY pointing to the PF. They themselves are expected to end by jumping
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; to the address at (IP). They will usually do so with "jp next".
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@ -642,7 +652,7 @@ EXIT:
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; ( R:I -- )
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.db "QUIT"
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.fill 3
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.dw EXIT
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.dw $-EXIT
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.db 0
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QUIT:
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.dw compiledWord
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@ -659,7 +669,7 @@ QUIT:
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.db "ABORT"
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.fill 2
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.dw QUIT
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.dw $-QUIT
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.db 0
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ABORT:
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.dw compiledWord
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@ -685,7 +695,7 @@ abortUnderflow:
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.db "BYE"
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.fill 4
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.dw ABORT
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.dw $-ABORT
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.db 0
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BYE:
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.dw nativeWord
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@ -700,7 +710,7 @@ BYE:
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; ( c -- )
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.db "EMIT"
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.fill 3
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.dw BYE
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.dw $-BYE
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.db 0
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EMIT:
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.dw nativeWord
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@ -711,7 +721,7 @@ EMIT:
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jp next
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.db "(print)"
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.dw EMIT
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.dw $-EMIT
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.db 0
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PRINT:
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.dw nativeWord
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@ -728,7 +738,7 @@ PRINT:
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; ( c port -- )
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.db "PC!"
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.fill 4
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.dw PRINT
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.dw $-PRINT
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.db 0
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PSTORE:
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.dw nativeWord
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@ -741,7 +751,7 @@ PSTORE:
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; ( port -- c )
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.db "PC@"
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.fill 4
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.dw PSTORE
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.dw $-PSTORE
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.db 0
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PFETCH:
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.dw nativeWord
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@ -754,7 +764,7 @@ PFETCH:
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.db "C,"
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.fill 5
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.dw PFETCH
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.dw $-PFETCH
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.db 0
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CWR:
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.dw nativeWord
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@ -769,7 +779,7 @@ CWR:
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.db ","
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.fill 6
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.dw CWR
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.dw $-CWR
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.db 0
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WR:
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.dw nativeWord
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@ -782,7 +792,7 @@ WR:
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.db "ROUTINE"
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.dw WR
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.dw $-WR
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.db 1 ; IMMEDIATE
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ROUTINE:
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.dw compiledWord
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@ -818,6 +828,9 @@ ROUTINE:
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jr z, .end
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ld de, NUMBER
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cp 'N'
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jr z, .end
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ld de, chkPS
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cp 'P'
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jr nz, .notgood
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; continue to end on match
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.end:
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@ -834,7 +847,7 @@ ROUTINE:
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; ( addr -- )
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.db "EXECUTE"
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.dw ROUTINE
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.dw $-ROUTINE
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.db 0
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EXECUTE:
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.dw nativeWord
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@ -851,7 +864,7 @@ EXECUTE:
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.db ";"
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.fill 6
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.dw EXECUTE
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.dw $-EXECUTE
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.db 1 ; IMMEDIATE
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ENDDEF:
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.dw compiledWord
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@ -866,7 +879,7 @@ ENDDEF:
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.db ":"
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.fill 6
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.dw ENDDEF
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.dw $-ENDDEF
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.db 1 ; IMMEDIATE
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DEFINE:
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.dw compiledWord
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@ -911,7 +924,7 @@ DEFINE:
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.db "DOES>"
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.fill 2
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.dw DEFINE
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.dw $-DEFINE
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.db 0
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DOES:
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.dw nativeWord
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@ -932,7 +945,7 @@ DOES:
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.db "IMMEDIA"
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.dw DOES
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.dw $-DOES
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.db 0
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IMMEDIATE:
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.dw nativeWord
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@ -944,7 +957,7 @@ IMMEDIATE:
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.db "IMMED?"
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.fill 1
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.dw IMMEDIATE
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.dw $-IMMEDIATE
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.db 0
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ISIMMED:
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.dw nativeWord
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@ -962,7 +975,7 @@ ISIMMED:
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; ( n -- )
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.db "LITN"
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.fill 3
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.dw ISIMMED
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.dw $-ISIMMED
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.db 0
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LITN:
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.dw nativeWord
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@ -977,7 +990,7 @@ LITN:
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.db "SCPY"
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.fill 3
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.dw LITN
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.dw $-LITN
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.db 0
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SCPY:
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.dw nativeWord
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@ -990,7 +1003,7 @@ SCPY:
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.db "(find)"
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.fill 1
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.dw SCPY
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.dw $-SCPY
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.db 0
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FIND_:
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.dw nativeWord
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@ -1010,7 +1023,7 @@ FIND_:
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.db "'"
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.fill 6
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.dw FIND_
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.dw $-FIND_
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.db 0
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FIND:
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.dw compiledWord
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@ -1022,7 +1035,7 @@ FIND:
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.db "[']"
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.fill 4
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.dw FIND
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.dw $-FIND
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.db 0b01 ; IMMEDIATE
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FINDI:
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.dw compiledWord
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@ -1044,7 +1057,7 @@ FINDERR:
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; ( -- c )
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.db "KEY"
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.fill 4
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.dw FINDI
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.dw $-FINDI
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.db 0
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KEY:
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.dw nativeWord
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@ -1073,7 +1086,7 @@ CIN:
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; 32 CMP 1 -
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.db "WS?"
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.fill 4
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.dw KEY
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.dw $-KEY
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.db 0
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ISWS:
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.dw compiledWord
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@ -1087,7 +1100,7 @@ ISWS:
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.db "NOT"
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.fill 4
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.dw ISWS
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.dw $-ISWS
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.db 0
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NOT:
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.dw nativeWord
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@ -1107,7 +1120,7 @@ NOT:
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; C< DUP 32 CMP 1 - SKIP? EXIT DROP TOWORD
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.db "TOWORD"
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.fill 1
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.dw NOT
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.dw $-NOT
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.db 0
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TOWORD:
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.dw compiledWord
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@ -1124,7 +1137,7 @@ TOWORD:
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; HL point to WORDBUF.
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.db "WORD"
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.fill 3
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.dw TOWORD
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.dw $-TOWORD
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.db 0
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WORD:
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.dw compiledWord
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@ -1171,7 +1184,7 @@ WORD:
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.db "(parsed"
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.dw WORD
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.dw $-WORD
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.db 0
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PARSED:
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.dw nativeWord
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@ -1192,7 +1205,7 @@ PARSED:
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.db "(parse)"
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.dw PARSED
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.dw $-PARSED
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.db 0
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PARSE:
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.dw compiledWord
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@ -1222,7 +1235,7 @@ PARSEI:
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; Spit name (in (HL)) + prev in (HERE) and adjust (HERE) and (CURRENT)
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; HL points to new (HERE)
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.db "(entry)"
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.dw PARSE
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.dw $-PARSE
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.db 0
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ENTRYHEAD:
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.dw nativeWord
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@ -1233,6 +1246,11 @@ ENTRYHEAD:
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ld de, (CURRENT)
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ld a, NAMELEN
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call addHL
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push hl ; --> lvl 1
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or a ; clear carry
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sbc hl, de
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ex de, hl
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pop hl ; <-- lvl 1
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call DEinHL
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; Set word flags: not IMMED, so it's 0
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xor a
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@ -1250,7 +1268,7 @@ ENTRYHEAD:
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; this word is not documented in dictionary.txt
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.db "(sysv)"
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.fill 1
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.dw ENTRYHEAD
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.dw $-ENTRYHEAD
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.db 0
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SYSV:
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.dw compiledWord
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@ -1278,21 +1296,21 @@ SYSV:
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.db "HERE"
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.fill 3
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.dw SYSV
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.dw $-SYSV
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.db 0
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HERE_: ; Caution: conflicts with actual variable name
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.dw sysvarWord
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.dw HERE
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.db "CURRENT"
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.dw HERE_
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.dw $-HERE_
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.db 0
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CURRENT_:
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.dw sysvarWord
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.dw CURRENT
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.db "(parse*"
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.dw CURRENT_
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.dw $-CURRENT_
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.db 0
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PARSEPTR_:
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.dw sysvarWord
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@ -1300,7 +1318,7 @@ PARSEPTR_:
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.db "FLAGS"
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.fill 2
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.dw PARSEPTR_
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.dw $-PARSEPTR_
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.db 0
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FLAGS_:
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.dw sysvarWord
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@ -1309,7 +1327,7 @@ FLAGS_:
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; ( n a -- )
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.db "!"
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.fill 6
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.dw FLAGS_
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.dw $-FLAGS_
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.db 0
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STORE:
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.dw nativeWord
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@ -1323,7 +1341,7 @@ STORE:
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; ( n a -- )
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.db "C!"
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.fill 5
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.dw STORE
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.dw $-STORE
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.db 0
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CSTORE:
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.dw nativeWord
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@ -1336,7 +1354,7 @@ CSTORE:
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; ( a -- n )
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.db "@"
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.fill 6
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.dw CSTORE
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.dw $-CSTORE
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.db 0
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FETCH:
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.dw nativeWord
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@ -1349,7 +1367,7 @@ FETCH:
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; ( a -- c )
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.db "C@"
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.fill 5
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.dw FETCH
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.dw $-FETCH
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.db 0
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CFETCH:
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.dw nativeWord
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@ -1363,7 +1381,7 @@ CFETCH:
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; ( a -- )
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.db "DROP"
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.fill 3
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.dw CFETCH
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.dw $-CFETCH
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.db 0
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DROP:
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.dw nativeWord
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@ -1373,7 +1391,7 @@ DROP:
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; ( a b -- b a )
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.db "SWAP"
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.fill 3
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.dw DROP
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.dw $-DROP
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.db 0
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SWAP:
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.dw nativeWord
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@ -1386,7 +1404,7 @@ SWAP:
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; ( a b c d -- c d a b )
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.db "2SWAP"
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.fill 2
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.dw SWAP
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.dw $-SWAP
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.db 0
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SWAP2:
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.dw nativeWord
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@ -1404,7 +1422,7 @@ SWAP2:
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; ( a -- a a )
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.db "DUP"
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.fill 4
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.dw SWAP2
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.dw $-SWAP2
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.db 0
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DUP:
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.dw nativeWord
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@ -1417,7 +1435,7 @@ DUP:
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; ( a b -- a b a b )
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.db "2DUP"
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.fill 3
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.dw DUP
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.dw $-DUP
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.db 0
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DUP2:
|
||||
.dw nativeWord
|
||||
@ -1433,7 +1451,7 @@ DUP2:
|
||||
; ( a b -- a b a )
|
||||
.db "OVER"
|
||||
.fill 3
|
||||
.dw DUP2
|
||||
.dw $-DUP2
|
||||
.db 0
|
||||
OVER:
|
||||
.dw nativeWord
|
||||
@ -1448,7 +1466,7 @@ OVER:
|
||||
; ( a b c d -- a b c d a b )
|
||||
.db "2OVER"
|
||||
.fill 2
|
||||
.dw OVER
|
||||
.dw $-OVER
|
||||
.db 0
|
||||
OVER2:
|
||||
.dw nativeWord
|
||||
@ -1468,7 +1486,7 @@ OVER2:
|
||||
; ( a b c -- b c a)
|
||||
.db "ROT"
|
||||
.fill 4
|
||||
.dw OVER2
|
||||
.dw $-OVER2
|
||||
.db 0
|
||||
ROT:
|
||||
.dw nativeWord
|
||||
@ -1483,7 +1501,7 @@ ROT:
|
||||
|
||||
.db ">R"
|
||||
.fill 5
|
||||
.dw ROT
|
||||
.dw $-ROT
|
||||
.db 0
|
||||
P2R:
|
||||
.dw nativeWord
|
||||
@ -1494,7 +1512,7 @@ P2R:
|
||||
|
||||
.db "R>"
|
||||
.fill 5
|
||||
.dw P2R
|
||||
.dw $-P2R
|
||||
.db 0
|
||||
R2P:
|
||||
.dw nativeWord
|
||||
@ -1504,7 +1522,7 @@ R2P:
|
||||
|
||||
.db "I"
|
||||
.fill 6
|
||||
.dw R2P
|
||||
.dw $-R2P
|
||||
.db 0
|
||||
I:
|
||||
.dw nativeWord
|
||||
@ -1515,7 +1533,7 @@ I:
|
||||
|
||||
.db "I'"
|
||||
.fill 5
|
||||
.dw I
|
||||
.dw $-I
|
||||
.db 0
|
||||
IPRIME:
|
||||
.dw nativeWord
|
||||
@ -1526,7 +1544,7 @@ IPRIME:
|
||||
|
||||
.db "J"
|
||||
.fill 6
|
||||
.dw IPRIME
|
||||
.dw $-IPRIME
|
||||
.db 0
|
||||
J:
|
||||
.dw nativeWord
|
||||
@ -1538,7 +1556,7 @@ J:
|
||||
; ( a b -- c ) A + B
|
||||
.db "+"
|
||||
.fill 6
|
||||
.dw J
|
||||
.dw $-J
|
||||
.db 0
|
||||
PLUS:
|
||||
.dw nativeWord
|
||||
@ -1552,7 +1570,7 @@ PLUS:
|
||||
; ( a b -- c ) A - B
|
||||
.db "-"
|
||||
.fill 6
|
||||
.dw PLUS
|
||||
.dw $-PLUS
|
||||
.db 0
|
||||
MINUS:
|
||||
.dw nativeWord
|
||||
@ -1567,7 +1585,7 @@ MINUS:
|
||||
; ( a b -- c ) A * B
|
||||
.db "*"
|
||||
.fill 6
|
||||
.dw MINUS
|
||||
.dw $-MINUS
|
||||
.db 0
|
||||
MULT:
|
||||
.dw nativeWord
|
||||
@ -1594,7 +1612,7 @@ MULT:
|
||||
|
||||
.db "/MOD"
|
||||
.fill 3
|
||||
.dw MULT
|
||||
.dw $-MULT
|
||||
.db 0
|
||||
DIVMOD:
|
||||
.dw nativeWord
|
||||
@ -1609,7 +1627,7 @@ DIVMOD:
|
||||
|
||||
.db "AND"
|
||||
.fill 4
|
||||
.dw DIVMOD
|
||||
.dw $-DIVMOD
|
||||
.db 0
|
||||
AND:
|
||||
.dw nativeWord
|
||||
@ -1627,7 +1645,7 @@ AND:
|
||||
|
||||
.db "OR"
|
||||
.fill 5
|
||||
.dw AND
|
||||
.dw $-AND
|
||||
.db 0
|
||||
OR:
|
||||
.dw nativeWord
|
||||
@ -1645,7 +1663,7 @@ OR:
|
||||
|
||||
.db "XOR"
|
||||
.fill 4
|
||||
.dw OR
|
||||
.dw $-OR
|
||||
.db 0
|
||||
XOR:
|
||||
.dw nativeWord
|
||||
@ -1667,7 +1685,7 @@ XOR:
|
||||
|
||||
.db "0"
|
||||
.fill 6
|
||||
.dw XOR
|
||||
.dw $-XOR
|
||||
.db 0
|
||||
ZERO:
|
||||
.dw nativeWord
|
||||
@ -1677,7 +1695,7 @@ ZERO:
|
||||
|
||||
.db "1"
|
||||
.fill 6
|
||||
.dw ZERO
|
||||
.dw $-ZERO
|
||||
.db 0
|
||||
ONE:
|
||||
.dw nativeWord
|
||||
@ -1688,7 +1706,7 @@ ONE:
|
||||
; ( a1 a2 -- b )
|
||||
.db "SCMP"
|
||||
.fill 3
|
||||
.dw ONE
|
||||
.dw $-ONE
|
||||
.db 0
|
||||
SCMP:
|
||||
.dw nativeWord
|
||||
@ -1703,7 +1721,7 @@ SCMP:
|
||||
; ( n1 n2 -- f )
|
||||
.db "CMP"
|
||||
.fill 4
|
||||
.dw SCMP
|
||||
.dw $-SCMP
|
||||
.db 0
|
||||
CMP:
|
||||
.dw nativeWord
|
||||
@ -1721,7 +1739,7 @@ CMP:
|
||||
; to after null-termination.
|
||||
.db "SKIP?"
|
||||
.fill 2
|
||||
.dw CMP
|
||||
.dw $-CMP
|
||||
.db 0
|
||||
CSKIP:
|
||||
.dw nativeWord
|
||||
@ -1779,7 +1797,7 @@ CSKIP:
|
||||
; contain 3. Add this value to RS.
|
||||
.db "(fbr)"
|
||||
.fill 2
|
||||
.dw CSKIP
|
||||
.dw $-CSKIP
|
||||
.db 0
|
||||
FBR:
|
||||
.dw nativeWord
|
||||
@ -1793,7 +1811,7 @@ FBR:
|
||||
|
||||
.db "(bbr)"
|
||||
.fill 2
|
||||
.dw FBR
|
||||
.dw $-FBR
|
||||
.db 0
|
||||
BBR:
|
||||
.dw nativeWord
|
||||
@ -1805,5 +1823,11 @@ BBR:
|
||||
ld (IP), hl
|
||||
jp next
|
||||
|
||||
; To allow dict binaries to "hook themselves up", we always end such binary
|
||||
; with a dummy, *empty* entry. Therefore, we can have a predictable place for
|
||||
; getting a prev label.
|
||||
|
||||
.db "_______"
|
||||
.dw $-BBR
|
||||
.db 0
|
||||
LATEST:
|
||||
.dw BBR
|
||||
|
||||
Loading…
Reference in New Issue
Block a user