Merge pull request #102 from feilipu/master

hbios - tmp stack tweak

Source/HBIOS/hbios.asm

@@ -179,7 +179,7 @@ ROM_SIG:
 ;
 NAME	.DB	"ROMWBW v", BIOSVER, ", ", TIMESTAMP, 0
 AUTH	.DB	"WBW",0
-DESC	.DB	"ROMWBW v", BIOSVER, ", Copyright (C) 2019, Wayne Warthen, GNU GPL v3", 0
+DESC	.DB	"ROMWBW v", BIOSVER, ", Copyright (C) 2020, Wayne Warthen, GNU GPL v3", 0
 ;
 	.FILL	($100 - $),$FF		; PAD REMAINDER OF PAGE ZERO
 ;
@@ -285,10 +285,11 @@ HBX_INVOKE:
 #ENDIF
 
 	LD	(HBX_INVSP),SP		; SAVE ORIGINAL STACK FRAME
+	LD	SP,HBX_BUF_END		; BORROW HBX_BUF FOR TEMP STACK
+
 	LD	A,(HB_CURBNK)		; GET CURRENT BANK
 	LD	(HB_INVBNK),A		; SAVE INVOCATION BANK
 
-	LD	SP,HBX_BUF_END		; BORROW HBX_BUF FOR TEMP STACK
 	LD	A,BID_BIOS		; HBIOS BANK
 	CALL	HBX_BNKSEL		; SELECT IT
 	LD	SP,HB_STACK		; NOW USE FULL HBIOS STACK IN HBIOS BANK
@@ -671,7 +672,7 @@ HBX_INT_SP	.EQU	$ - 2
 ;
 #ENDIF
 ;
-; SMALL TEMPORARY STACK FOR USE BY BNKCPY, PEEK, AND POKE
+; SMALL TEMPORARY STACK FOR USE BY HBX_BNKCPY
 ;
 HBX_TMPSTKSIZ	.EQU	(HBX_XFC - HBX_BUFSIZ - $)
 		.ECHO	"HBIOS TEMP STACK space: "
@@ -682,7 +683,7 @@ HBX_TMPSTK	.EQU	$
 ;
 ; INTERBANK COPY BOUNCE BUFFER (64 BYTES)
 ;
-; N.B., THIS BUFFER IS ALSO USED AS A TEMPORARY STACK BY HBX_INVOKE.
+; N.B., THIS BUFFER IS ALSO USED AS A TEMPORARY STACK BY INVOKE, PEEK, AND POKE.
 ; THEREFORE, THIS BUFFER *CANNOT* BE USED TO PASS DATA OUTSIDE OF
 ; HBIOS FUNCTION CALLS.
 ;