labels, jumps, modr/m byte encoding

asm.qf

@@ -11,7 +11,6 @@ var currop
 4 const OP_IMM
 
 : op! ( op type ) currop @ >r optypes r@ + ! ops r@ + ! 1 r> + currop ! ;
-: assembled 0 currop ! ;
 
 : mkreg makedo , does> @ swap makedo , , does> dup @ swap 1 + @ op! ;
 OP_REG8 mkreg reg8
@@ -26,6 +25,32 @@ OP_SREG mkreg sreg
 
 : # OP_IMM op! ;
 
+&h80 const LBL_REL
+var lblfixup var currlbl
+
+: currlbl-head currlbl @ 1 + ;
+: mk-lbl-fixpoint
+  here currlbl-head @ , tell , lblfixup @ , currlbl-head ! ;
+
+: :> makedo tell , 0 , does> 0 # currlbl ! ;
+: fixlabel.rel currlbl @ @ tell - &hff & tell 1 - seek outb! ;
+: fixlabel.addr currlbl @ @ &h100 + tell 2 - seek outw! ;
+: fixlabel ( fixtype -- ) if fixlabel.rel else fixlabel.addr then ;
+: fixpoint.seek ( p -- ) 1 + @ seek ;
+: fixpoint.fix ( p -- ) 2 + @ fixlabel ;
+: fixpoint ( p -- next ) dup fixpoint.seek dup fixpoint.fix @ ;
+
+: fix.fixpoints currlbl-head @ begin dup while fixpoint repeat drop ;
+
+: assembled ( success -- ) 
+  currlbl @ and if 
+    lblfixup @ fixlabel 
+    mk-lbl-fixpoint 
+  then 0 currop ! 0 lblfixup ! 0 currlbl ! ;
+
+: update.label tell currlbl @ ! ;
+: <: update.label tell fix.fixpoints seek 0 assembled ;
+
 : read-impl ( p -- next cp optypes )
   dup @ swap
   dup 1 + @ swap
@@ -37,12 +62,14 @@ OP_SREG mkreg sreg
       if drop drop 0 ret then
   repeat drop drop 1 ;
 
-: inst ( opcount -- ) makedo , 0 , does>
+
+: inst ( opcount|lblfixup -- ) makedo dup &h7f & , 0 , &h80 & , does>
+  dup 2 + @ lblfixup !
   dup @ currop @ != if 0 message yelp ret then
   1 + @ begin dup while 
     read-impl currop @ match-impl
-    if execute drop assembled ret else drop then 
-  repeat drop 1 message yelp ;
+    if execute drop 1 assembled ret else drop then 
+  repeat drop 1 message yelp 0 assembled ;
 
 : inst-nextimpl do.data 1 + ;
 : inst-opcount do.data @ ;
@@ -53,18 +80,39 @@ OP_SREG mkreg sreg
   r@ inst-opcount begin dup while 1 - swap , repeat drop
   r> inst-nextimpl r> swap ! ;
 
-: int &hcd outb! outb! assembled ;
+: int &hcd outb! outb! 1 assembled ;
 2 inst mov
 2 inst movb
 
 OP_IMM OP_REG16 :noname &hb8 op1 + outb! op2 outw! ; ' mov impl
 OP_IMM OP_REG8 :noname &hb0 op1 + outb! op2 outb! ; ' movb impl
+: :+r anondo >r , OP_REG16 r> does> @ op1 + outb! ;
+: :+sreg anondo >r , OP_SREG r> does> @ op1 8 * + outb! ;
 
 1 inst push
-OP_SREG :noname &h06 op1 8 * + outb! ; ' push impl
-OP_REG16 :noname &h50 op1 + outb! ; ' push impl
+&h06 :+sreg ' push impl
+&h50 :+r ' push impl
 1 inst pop
-OP_SREG :noname &h07 op1 8 * + outb! ; ' pop impl
-OP_REG16 :noname &h58 op1 + outb! ; ' pop impl
+&h07 :+sreg ' pop impl
+&h58 :+r ' pop impl
+1 inst dec
+&h48 :+r ' dec impl
 
+: :jumprel here >r 1 LBL_REL | inst 
+  :| anondo >r , OP_IMM r> does> @ outb! op1 outb! |; r> impl ;
+
+&h77 :jumprel ja
+&h73 :jumprel jae
+&h72 :jumprel jb
+&h76 :jumprel jbe
+&h74 :jumprel je
+&h7f :jumprel jg
+&h7d :jumprel jge
+&h7c :jumprel jl
+&h7e :jumprel jle
+&h75 :jumprel jne
+&h74 :jumprel jz
+
+: .EXIT ax &h4c00 | # mov &h21 int ;
+: d" begin in@ dup [ in@ " lit ] != while outb! repeat drop ;
 

boot.qf

@@ -34,7 +34,9 @@
 
 : $do r> dup 1 + swap @ >r ;
 var does.patch
-: makedo word@ create ' $do , here does.patch ! -1 , ;
+: compiledo ' $do , here does.patch ! -1 , ;
+: makedo word@ create compiledo  ;
+: anondo here compiledo ;
 : does> here 3 + lit :| does.patch @ ! rdrop |; , ; immediate
 
 : do.data ( cp -- data ) 2 + ;

in.asm

@@ -1,15 +1,20 @@
-: .EXIT ax &h4c00 | # mov &h21 int ;
-: d" begin in@ dup [ in@ " lit ] != while outb! repeat drop ;
+  cs push \ copy code segment to data segment
+  ds pop
 
-cs push \ copy code segment to data segment
-ds pop
+\ jne not yet working
+\ :> loop
+\   cx 3 # mov
 
-tell 1 + dx 0 # mov
-ah 9 # movb
-&h21 int
+:> msg
+   dx msg mov
+   ah 9 # movb
+   &h21 int
 
-0 .EXIT
+\   cx dec
+\   loop jne
+
+   0 .EXIT
+
+msg <:
+   d" Hello World!$"
 
-tell 
-d" Hello World!$"
-&h100 + swap seek outw!

qf.bas

@@ -447,7 +447,7 @@ END FUNCTION
 
 FUNCTION lookup (w$)
   lookup = -1
-  FOR i = 0 TO mem(P.LATEST)
+  FOR i = mem(P.LATEST) TO 0 STEP -1
     IF RTRIM$(words(i).nm) = w$ THEN
       lookup = i
       GOTO found

trace.txt

@@ -1,39 +1,15 @@
-read: :
-read: .EXIT
-read: ax
-read: &h4c00
-read: |
-read: #
-read: mov
-read: &h21
-read: int
-read: ;
-read: :
-read: d"
-read: begin
-read: in@
-read: dup
-read: [
-read: in@
-read: lit
-read: ]
-read: !=
-read: while
-read: outb!
-read: repeat
-read: drop
-read: ;
 read: cs
 read: push
 read: \
 read: ds
 read: pop
-read: tell
-read: 1
-read: +
+read: \
+read: \
+read: \
+read: :>
+read: msg
 read: dx
-read: 0
-read: #
+read: msg
 read: mov
 read: ah
 read: 9
@@ -41,12 +17,10 @@ read: #
 read: movb
 read: &h21
 read: int
+read: \
+read: \
 read: 0
 read: .EXIT
-read: tell
+read: msg
+read: <:
 read: d"
-read: &h100
-read: +
-read: swap
-read: seek
-read: outw!