Importing bank-managing macros from skdisasm

Currently used for banks where data is aligned to start of bank
(MusicPoint1, MusicPoint2).

s2.asm

@@ -88027,15 +88027,15 @@ SndDAC_End
 ; ---------------------------------------------------------------------------
 ; Music pointers
 ; ---------------------------------------------------------------------------
-	align $8000
-
 ; loc_F0000:
-MusicPoint1:
+MusicPoint1:	startBank
 MusPtr_Continue:	rom_ptr_z80	Mus_Continue
 
 
 Mus_Continue:   BINCLUDE	"sound/music/Continue.bin"
 
+	finishBank
+
 ; --------------------------------------------------------------------
 ; Nemesis compressed art (20 blocks)
 ; Buzzer's fireball
@@ -88166,11 +88166,8 @@ Snd_Sega_End:
 ; ------------------------------------------------------------------------------
 ; Music pointers
 ; ------------------------------------------------------------------------------
-	align $8000
-soundBankStart	:= *
-
 ; loc_F8000:
-MusicPoint2:
+MusicPoint2:	startBank
 MusPtr_CNZ_2P:		rom_ptr_z80	Mus_CNZ_2P
 MusPtr_EHZ:		rom_ptr_z80	Mus_EHZ
 MusPtr_MTZ:		rom_ptr_z80	Mus_MTZ
@@ -90136,11 +90133,7 @@ Sound70:	dc.w $0000,$0101
 		dc.b $F2
 
 
-	if * > soundBankStart + $8000
-		fatal "soundBank must fit in $8000 bytes but was $\{*-soundBankStart}. Try moving something to the other bank."
-	else
-		;message "soundBank has $\{$8000+soundBankStart-*} bytes free at end."
-	endif
+	finishBank
 
 ; end of 'ROM'
 	if padToPowerOfTwo && (*)&(*-1)

s2.macros.asm

@@ -92,6 +92,25 @@ rom_ptr_z80 macro addr
 	dc.w z80_ptr(addr)
     endm
 
+; aligns the start of a bank, and detects when the bank's contents is too large
+; can also print the amount of free space in a bank with DebugSoundbanks set
+startBank macro {INTLABEL}
+	align	$8000
+__LABEL__ label *
+soundBankStart := __LABEL__
+soundBankName := "__LABEL__"
+    endm
+
+DebugSoundbanks := 0
+
+finishBank macro
+	if * > soundBankStart + $8000
+		fatal "soundBank \{soundBankName} must fit in $8000 bytes but was $\{*-soundBankStart}. Try moving something to the other bank."
+	elseif (DebugSoundbanks<>0)&&(MOMPASS=1)
+		message "soundBank \{soundBankName} has $\{$8000+soundBankStart-*} bytes free at end."
+	endif
+    endm
+
 ; macro to replace the destination with its absolute value
 abs macro destination
 	tst.ATTRIBUTE	destination