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109 lines
2.5 KiB
ArmAsm
109 lines
2.5 KiB
ArmAsm
;
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; Startup code for cc65 (Oric version)
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;
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; By Debrune Jérôme <jede@oric.org> and Ullrich von Bassewitz <uz@cc65.org>
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; 2015-01-09, Greg King
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;
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.export _exit
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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.import initlib, donelib
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.import callmain, zerobss
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.import __RAM_START__, __RAM_SIZE__, __STACKSIZE__
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.include "zeropage.inc"
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.include "atmos.inc"
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; ------------------------------------------------------------------------
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; Place the startup code in a special segment.
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.segment "STARTUP"
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; Save the zero-page area that we're about to use.
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ldx #zpspace-1
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L1: lda sp,x
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sta zpsave,x
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dex
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bpl L1
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; Clear the BSS data.
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jsr zerobss
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; Currently, color isn't supported on the text screen.
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; Unprotect screen columns 0 and 1 (where each line's color codes would sit).
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lda STATUS
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sta stsave
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and #%11011111
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sta STATUS
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; Save some system stuff; and, set up the stack.
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tsx
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stx spsave ; Save system stk ptr
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lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
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sta sp
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lda #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
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sta sp+1 ; Set argument stack ptr
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; Call the module constructors.
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jsr initlib
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; Push the command-line arguments; and, call main().
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jsr callmain
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; Call the module destructors. This is also the exit() entry.
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_exit: jsr donelib
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; Restore the system stuff.
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ldx spsave
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txs
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lda stsave
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sta STATUS
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; Copy back the zero-page stuff.
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ldx #zpspace-1
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L2: lda zpsave,x
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sta sp,x
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dex
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bpl L2
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; Back to BASIC.
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rts
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; ------------------------------------------------------------------------
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.segment "ZPSAVE1"
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zpsave:
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; This padding is needed by a bug in the ROM.
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; (The CLOAD command starts BASIC's variables table on top of the last byte
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; that was loaded [instead of at the next address].)
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; This is overlaid on a buffer, so that it doesn't use extra space in RAM.
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.byte 0
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; The segments "ZPSAVE1" and "ZPSAVE2" always must be together.
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; They create a single object (the zpsave buffer).
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.segment "ZPSAVE2"
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.res zpspace - 1
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; ------------------------------------------------------------------------
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.bss
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spsave: .res 1
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stsave: .res 1
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