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amukh1 · Mar 5, 2024 · 62e92cd · 62e92cd
1 parent 5c06451
commit 62e92cd
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diff --git a/crt0.o b/crt0.o
diff --git a/crt0.s b/crt0.s
@@ -0,0 +1,38 @@
+.export _init, _exit
+.exportzp sp
+.import _main
+
+.export __STARTUP__: absolute = 1
+.import __RAM_START__, __RAM_SIZE__
+
+.import copydata, zerobss, initlib, donelib
+
+; .include "zeropage.inc"
+
+; reserve byte or sp
+.segment "ZEROPAGE"
+sp: .res 1
+
+
+
+.segment "STARTUP"
+
+_init: ldx #$ff
+        txs
+        cld
+
+        lda #<(__RAM_START__ + __RAM_SIZE__)
+        STA sp
+        lda #>(__RAM_START__ + __RAM_SIZE__)
+        STA sp+1
+
+        jsr zerobss
+        jsr copydata
+        jsr initlib
+
+        jsr _main
+
+_exit:
+        jsr donelib
+        brk
+