z80: move boot code around

Bring native words together, make the next/exec/does/compiled
cluster be at the beginning.

Next step: bring find code into _find word.

blk/284

@@ -1,15 +1,14 @@
-H@ 4 + XCURRENT ! ( make next CODE have 0 prev field )
-CODE (br) ( TODO: move with other native words )
-L1 BSET ( used in ?br and loop )
-PC ORG @ 0x3d + ! ( stable ABI JP )
-    E 0 IY+ LDrIXY, D 1 IY+ LDrIXY,
-    DE ADDIYd,
-;CODE
-CODE (?br)
-PC ORG @ 0x41 + ! ( stable ABI JP )
-    HL POP,
-    HLZ,
-    JRZ, L1 BWR ( br + 1. False, branch )
-    ( True, skip next 2 bytes and don't branch )
-    IY INCd, IY INCd,
-;CODE
+PC ORG @ 1 + ! ( main )
+( STACK OVERFLOW PROTECTION: See B76 )
+    SP PS_ADDR LDdn, IX RS_ADDR LDdn,
+( LATEST is a label to the latest entry of the dict. It is
+  written at offset 0x08 by the process or person building
+  Forth. )
+    BIN( @ 0x08 + LDHL(n),
+    SYSVARS 0x02 ( CURRENT ) + LD(n)HL,
+HERESTART [IF]
+    HL HERESTART LDdn,
+[THEN]
+    SYSVARS 0x04 + LD(n)HL, ( RAM+04 == HERE )
+    DE BIN( @ 0x04 ( BOOT ) + LDdd(n),
+    JR, L1 FWR ( execute, B287 )

blk/285

@@ -1,10 +1,3 @@
-CODE (loop)
-PC ORG @ 0x45 + ! ( stable ABI JP )
-    0 IX+ INC(IXY+), IFZ, 1 IX+ INC(IXY+), THEN, ( I++ )
-    ( Jump if I <> I' )
-    A 0 IX+ LDrIXY, 2 IX- CP(IXY+), JRNZ, L1 BWR ( branch )
-    A 1 IX+ LDrIXY, 1 IX- CP(IXY+), JRNZ, L1 BWR ( branch )
-    ( don't branch )
-    IX DECd, IX DECd, IX DECd, IX DECd,
-    IY INCd, IY INCd,
-;CODE
+lblofl BSET ( abortUnderflow )
+    DE BIN( @ 0x06 ( uflw ) + LDdd(n),
+    JR, L2 FWR ( execute, B287 )

blk/286

@@ -5,11 +5,11 @@ lblnext BSET PC ORG @ 0x1b + ! ( next )
 	( Before we continue: are stacks within bounds? )
     ( PS ) HL PS_ADDR LDdn,
     SP SUBHLd,
-    JRC, lblofl BWR ( abortUnderflow-B298 )
+    JRC, lblofl BWR ( abortUnderflow-B285 )
     ( RS ) IX PUSH, HL POP,
     DE RS_ADDR LDdn,
     DE SUBHLd,
-    JRC, lblofl BWR ( IX < RS_ADDR? abortUnderflow-B298 )
+    JRC, lblofl BWR ( IX < RS_ADDR? abortUnderflow-B285 )
     E 0 IY+ LDrIXY,
     D 1 IY+ LDrIXY,
     IY INCd, IY INCd,

blk/287

@@ -0,0 +1,13 @@
+lblexec BSET L1 FSET ( B284 ) L2 FSET ( B285 )
+    ( DE -> wordref )
+    ( When we have a BIN( offset, we need to adjust stable
+      ABI offsets. )
+    BIN( @ [IF]
+        A XORr, D ORr, IFZ, D BIN( @ 256 / LDri, THEN,
+    [THEN]
+    LDA(DE), DE INCd,
+    A ORr, IFZ, EXDEHL, JP(HL), THEN,
+    A DECr, JRZ, L1 FWR ( compiled B289 )
+    ( cell or does. push PFA ) DE PUSH,
+    A DECr, JRZ, lblnext BWR ( cell )
+    ( continue to does )

blk/289

@@ -11,4 +11,4 @@
     LDDE(HL),
     HL INCd,
     HL PUSH, IY POP, ( --> IP )
-    JR, lblexec BWR      ( execute-B301 )
+    JR, lblexec BWR      ( execute-B287 )

blk/297

@@ -0,0 +1,16 @@
+( Native words )
+H@ 4 + XCURRENT ! ( make next CODE have 0 prev field )
+CODE (br) ( TODO: move with other native words )
+L1 BSET ( used in ?br and loop )
+PC ORG @ 0x3d + ! ( stable ABI JP )
+    E 0 IY+ LDrIXY, D 1 IY+ LDrIXY,
+    DE ADDIYd,
+;CODE
+CODE (?br)
+PC ORG @ 0x41 + ! ( stable ABI JP )
+    HL POP,
+    HLZ,
+    JRZ, L1 BWR ( br + 1. False, branch )
+    ( True, skip next 2 bytes and don't branch )
+    IY INCd, IY INCd,
+;CODE

blk/298

@@ -1,3 +1,12 @@
-lblofl BSET ( abortUnderflow )
-    DE BIN( @ 0x06 ( uflw ) + LDdd(n),
-    JR, L2 FWR ( execute, B301 )
+CODE (loop)
+PC ORG @ 0x45 + ! ( stable ABI JP )
+    0 IX+ INC(IXY+), IFZ, 1 IX+ INC(IXY+), THEN, ( I++ )
+    ( Jump if I <> I' )
+    A 0 IX+ LDrIXY, 2 IX- CP(IXY+), JRNZ, L1 BWR ( branch )
+    A 1 IX+ LDrIXY, 1 IX- CP(IXY+), JRNZ, L1 BWR ( branch )
+    ( don't branch )
+    IX DECd, IX DECd, IX DECd, IX DECd,
+    IY INCd, IY INCd,
+;CODE
+
+

blk/299

@@ -1,14 +0,0 @@
-PC ORG @ 1 + ! ( main )
-( STACK OVERFLOW PROTECTION: See B76 )
-    SP PS_ADDR LDdn, IX RS_ADDR LDdn,
-( LATEST is a label to the latest entry of the dict. It is
-  written at offset 0x08 by the process or person building
-  Forth. )
-    BIN( @ 0x08 + LDHL(n),
-    SYSVARS 0x02 ( CURRENT ) + LD(n)HL,
-HERESTART [IF]
-    HL HERESTART LDdn,
-[THEN]
-    SYSVARS 0x04 + LD(n)HL, ( RAM+04 == HERE )
-    DE BIN( @ 0x04 ( BOOT ) + LDdd(n),
-    JR, L1 FWR ( execute, B301 )

blk/301

@@ -1,13 +0,0 @@
-lblexec BSET L1 FSET ( B299 ) L2 FSET ( B298 )
-    ( DE -> wordref )
-    ( We don't apply BIN( reliably on stable ABI stuff, we
-      might need to adjust addr. Ugly, but well... )
-    BIN( @ [IF]
-        A XORr, D ORr, IFZ, D BIN( @ 256 / LDri, THEN,
-    [THEN]
-    LDA(DE), DE INCd,
-    A ORr, IFZ, EXDEHL, JP(HL), THEN,
-    A DECr, JRZ, L1 FWR ( compiled B303 )
-    ( cell or does. push PFA ) DE PUSH,
-    A DECr, JRZ, lblnext BWR ( cell )
-    ( continue to does, B302 )

blk/305

@@ -1,8 +1,7 @@
-( Native words )
 CODE EXECUTE
     DE POP,
     chkPS,
-    JR, lblexec BWR      ( execute-B301 )
+    lblexec @ JP,
 
 CODE EXIT
 PC ORG @ 0x0d + ! ( stable ABI JP )