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* Changed the way that Atmos programs are started.

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- Put a BASIC-language stub at the beginning.
  - Removed the Autostart flag.

  Those changes make it easy to give command-line arguments to a program.

* Made the Atmos configure file accept a special symbol definition on ld65's command line.  We can use "__RAMEND__" to increase the amount of RAM that's available to programs.
This commit is contained in:
Greg King
2014-11-09 06:32:11 -05:00
parent d75f9c2051
commit 09e50d433d
5 changed files with 116 additions and 47 deletions
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37
libsrc/atmos/crt0.s
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@@ -2,39 +2,18 @@
; Startup code for cc65 (Oric version)
;
; By Debrune J<>r<EFBFBD>me <jede@oric.org> and Ullrich von Bassewitz <uz@cc65.org>
; 2014-08-22, Greg King
; 2014-11-09, Greg King
;
.export _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
.import initlib, donelib
.import callmain, zerobss
.import __RAM_START__, __RAM_SIZE__
.import __ZPSAVE_LOAD__, __STACKSIZE__
.import __RAM_START__, __RAM_SIZE__, __STACKSIZE__
.include "zeropage.inc"
.include "atmos.inc"
; ------------------------------------------------------------------------
; Oric tape header
.segment "TAPEHDR"
.byte $16, $16, $16 ; Sync bytes
.byte $24 ; End of header marker
.byte $00 ; $2B0
.byte $00 ; $2AF
.byte $80 ; $2AE Machine code flag
.byte $C7 ; $2AD Autoload flag
.dbyt __ZPSAVE_LOAD__ - 1 ; $2AB
.dbyt __RAM_START__ ; $2A9
.byte $00 ; $2A8
.byte ((.VERSION >> 8) & $0F) + '0'
.byte ((.VERSION >> 4) & $0F) + '0'
.byte (.VERSION & $0F) + '0'
.byte $00 ; Zero terminated compiler version
; ------------------------------------------------------------------------
; Place the startup code in a special segment.
@@ -79,7 +58,7 @@ L1: lda sp,x
; Call the module destructors. This is also the exit() entry.
_exit: jsr donelib ; Run module destructors
_exit: jsr donelib
; Restore the system stuff.
@@ -104,7 +83,15 @@ L2: lda zpsave,x
.segment "ZPSAVE"
zpsave: .res zpspace
zpsave:
; This padding is needed by a bug in the ROM.
; (The CLOAD command starts BASIC's variables table on top of the last byte
; that was loaded [instead of at the next address].)
.byte 0
.res zpspace - 1
; ------------------------------------------------------------------------