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Sym-1 lib changes

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This commit is contained in:
Wayne Parham
2021-06-06 21:28:03 -05:00
parent e687f2f048
commit 6c4c959141
17 changed files with 339 additions and 421 deletions
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24
libsrc/sym1/crt0.s
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@@ -1,12 +1,6 @@
; ---------------------------------------------------------------------------
; crt0.s
;
; for Sym-1
; Startup code for cc65 (Sym-1 version)
;
; Wayne Parham
;
; wayne@parhamdata.com
; ---------------------------------------------------------------------------
.export _init, _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
@@ -19,40 +13,40 @@
.include "zeropage.inc"
.include "sym1.inc"
; ---------------------------------------------------------------------------
; Place the startup code in a special segment
.segment "STARTUP"
; ---------------------------------------------------------------------------
; A little light housekeeping
_init: jsr ACCESS ; Unlock System RAM
cld ; Clear decimal mode
; ---------------------------------------------------------------------------
; Turn off console echo
lda TECHO
and #$7F
sta TECHO
; ---------------------------------------------------------------------------
; Set cc65 argument stack pointer
lda #<(__RAM_START__ + __RAM_SIZE__)
sta sp
lda #>(__RAM_START__ + __RAM_SIZE__)
sta sp+1
; ---------------------------------------------------------------------------
; Initialize memory storage
jsr zerobss ; Clear BSS segment
jsr copydata ; Initialize DATA segment
jsr initlib ; Run constructors
; ---------------------------------------------------------------------------
; Call main()
jsr _main
; ---------------------------------------------------------------------------
; Back from main (this is also the _exit entry)
_exit: jsr donelib ; Run destructors
@@ -61,5 +55,5 @@ _exit: jsr donelib ; Run destructors
sta TECHO
jsr NACCES ; Lock System RAM
rts ; Re-enter Sym-1 monitor
; ---------------------------------------------------------------------------