z80/8086: extract 2>R code from stable ABI zone

Only its jump at 0x33 remains.

I've also fixed a strange offset oddity in 8086's (n) placement.
It was off by 2, but strangely, it ran properly. Anyway, now it's
fixed.

blk/091

@@ -5,8 +5,8 @@ sets that don't change (well, not without some binary manipu-
 lation). Here's the complete list of these references:
 
 04 BOOT addr         06 (uflw) addr      08 LATEST
-42 EXIT wordref      53 (br) wordref     67 (?br) wordref
-80 (loop) wordref    a9 2>R wordref      bf (n) wordref
+33 2>R wordref       42 EXIT wordref     53 (br) wordref
+67 (?br) wordref     80 (loop) wordref   bf (n) wordref
 d4 (s) wordref
 
 BOOT and (uflw) exist because they are referred to before those

blk/283

@@ -10,5 +10,5 @@ NOP, NOP, NOP, NOP, ( unused )
 0 JP, ( RST 28 )
 NOP, NOP, NOP, NOP, NOP, ( unused )
 0 JP, ( RST 30 )
-NOP, NOP, NOP, NOP, NOP, ( unused )
+0 A, 0 JP, ( 33, 2>R ) NOP, ( unused )
 0 JP, ( RST 38 )

blk/286

@@ -1,7 +1,4 @@
-CODE 2>R ( 0xa9 )
-    DE POP, HL POP,
-    17 BCALL, ( 17 == pushRS ) EXDEHL, 17 BCALL,
-;CODE NOP, NOP, NOP,
+ORG @ 0xb9 + HERE !
 CODE (n) ( 0xbf, number literal )
   ( Literal value to push to stack is next to (n) reference
     in the atom list. That is where IP is currently pointing.

blk/288

@@ -1,11 +1,14 @@
 CODE >R
-    HL POP,
-    17 BCALL, ( 17 == pushRS )
+    HL POP, 17 BCALL, ( 17 == pushRS )
 ;CODE
 CODE R>
-    20 BCALL, ( 20 == popRS )
-    HL PUSH,
+    20 BCALL, ( 20 == popRS ) HL PUSH,
 ;CODE
+CODE 2>R ( 0xa9 )
+PC ORG @ 0x35 + ! ( stable ABI JP )
+    DE POP, HL POP,
+    17 BCALL, ( 17 == pushRS ) EXDEHL, 17 BCALL,
+;CODE NOP, NOP, NOP,
 CODE 2R>
     20 BCALL, ( 20 == popRS ) EXDEHL, 20 BCALL,
     HL PUSH, DE PUSH,

blk/397

@@ -1,6 +1,6 @@
 ( Now we have "as late as possible" stuff. See B70 and B270. )
 : _bchk DUP 0x7f + 0xff > IF LIT< br-ovfl (print) ABORT THEN ;
-: DO 0xa9 ( 2>R ) , H@ ; IMMEDIATE
+: DO 0x33 ( 2>R ) , H@ ; IMMEDIATE
 : LOOP 0x80 ( loop ) , H@ - _bchk , ; IMMEDIATE
 ( LEAVE is implemented in low xcomp )
 : LITN 0xbf ( n ) , , ;

blk/805

@@ -12,4 +12,4 @@ JMPn, 0 A,,   ( 1a, next )     0 A, 0 A,,    ( unused )
 0 A, 0 A,, ( unused )
 0 A, 0 A,, 0 A, 0 A, ( unused )
 0 A, 0 A,,    ( unused )
-JMPn, 0 A,, ( 33, execute ) 0 A, 0 A, 0 A, 0 A,, ( unused )
+0 A, JMPn, 0 A,, ( 33, 2>R ) 0 A, 0 A, 0 A,, ( unused )

blk/807

@@ -5,11 +5,8 @@ CODE (loop) ( 0x80 )
     JNZ, L2 @ RPCs, ( branch )
     ( don't branch )
     BP 4 SUBxi, JMPs, L1 @ RPCs,
-ORG @ 0xa3 + HERE !
-CODE 2>R ( 0xa9 )
-    [BP] 4 POP[w]+, [BP] 2 POP[w]+, BP 4 ADDxi,
-;CODE NOP, NOP, NOP, NOP, NOP,
+ORG @ 0xb9 + HERE !
 CODE (n) ( 0xbf, number literal )
     DI DX MOVxx, DI [DI] MOVx[], DI PUSHx,
     DX INCx, DX INCx,
-;CODE NOP, NOP,
+;CODE NOP, NOP, NOP, NOP,

blk/810

@@ -1,4 +1,4 @@
-lblexec BSET PC 0x36 - ORG @ 0x34 + ! ( DI -> wordref )
+lblexec BSET ( DI -> wordref )
     AL [DI] MOVr[], DI INCx, ( PFA )
     AL AL ORrr, IFZ, DI JMPr, THEN, ( native )
     AL DECr, IFNZ, ( cell or does )

blk/813

@@ -7,10 +7,10 @@ CODE >R 1 chkPS,
 CODE R>
     [BP] 0 PUSH[w]+, BP DECx, BP DECx,
 ;CODE
+CODE 2>R
+PC 0x37 - ORG @ 0x35 + ! ( stable abi )
+    [BP] 4 POP[w]+, [BP] 2 POP[w]+, BP 4 ADDxi,
+;CODE
 CODE 2R> 2 chkPS,
     [BP] -2 PUSH[w]+, [BP] 0 PUSH[w]+, BP 4 SUBxi,
 ;CODE
-CODE ROT ( a b c -- b c a ) 3 chkPS,
-    CX POPx, BX POPx, AX POPx,
-    BX PUSHx, CX PUSHx, AX PUSHx,
-;CODE

blk/814

@@ -1,3 +1,7 @@
+CODE ROT ( a b c -- b c a ) 3 chkPS,
+    CX POPx, BX POPx, AX POPx,
+    BX PUSHx, CX PUSHx, AX PUSHx,
+;CODE
 CODE DUP 1 chkPS, AX POPx, AX PUSHx, AX PUSHx, ;CODE
 CODE ?DUP 1 chkPS, AX POPx, AX AX ORxx, AX PUSHx,
     IFNZ, AX PUSHx, THEN, ;CODE

cvm/xcomp.fs

@@ -10,6 +10,8 @@ CREATE BIN( 0 ,
 270 LOAD  ( xcomp overrides )
 
 H@ ORG !
+ORG @ 0x33 + HERE !
+0 C, 0x04 C, ( 2>R )
 ORG @ 0x3b + HERE !
 ," EXIT"
 0 , ( prev ) 4 C,
@@ -21,13 +23,12 @@ ORG @ 0x5f + HERE !
 0x02 CODE (?br) ( 0x67 )
 ORG @ 0x77 + HERE !
 0x03 CODE (loop) ( 0x80 )
-ORG @ 0xa3 + HERE !
-0x04 CODE 2>R ( 0xa9 )
 ORG @ 0xb9 + HERE !
 0x05 CODE (n) ( 0xbf )
 ORG @ 0xce + HERE !
 0x06 CODE (s) ( 0xd4 )
 ( END OF STABLE ABI )
+0x04 CODE 2>R
 0x07 CODE >R
 0x08 CODE R>
 0x09 CODE 2R>

emul/Makefile

@@ -7,7 +7,7 @@ BLKFS = $(CDIR)/blkfs
 .PHONY: all
 all: $(TARGETS)
 
-forth: forth.c $(OBJS) $(CDIR)/blkfs
+forth: forth.c $(OBJS) $(BLKFS)
 	$(CC) forth.c $(OBJS) -lncurses -o $@
 
 libz80/libz80.o: libz80/z80.c
@@ -17,7 +17,7 @@ libz80/libz80.o: libz80/z80.c
 emul.o: emul.c forth.bin $(BLKFS)
 	$(CC) -DFBIN_PATH=\"`pwd`/forth.bin\" -DBLKFS_PATH=\"`pwd`/$(BLKFS)\" -c -o emul.o emul.c
 
-forth.bin: xcomp.fs $(STAGE)
+forth.bin: xcomp.fs $(STAGE) $(BLKFS)
 	$(CDIR)/stage < xcomp.fs > $@
 
 $(BLKFS): $(STAGE)