mirror of https://github.com/a2-4am/4cade.git
106 lines
2.5 KiB
Plaintext
106 lines
2.5 KiB
Plaintext
;license:MIT
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;(c) 2020 by qkumba
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;
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; GS-specific code to support return-to-GS/OS
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;
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PrepareGSOS
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!cpu 65816
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clc
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xce
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rep #$30
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!al
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!rl
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pha ; reserve word return
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pea $1100 ; application-type, auxId #1
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ldx #$2003 ; GetNewID
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jsl $E10000
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ply
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sty @userID+1
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pha
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pha ; reserve dword return
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pha
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pea @return_e-@return_b ; dword size
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phy ; ID
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pea $8010 ; attrib (locked, can't cross bank)
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pha
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pha ; dword 0
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ldx #$0902 ; NewHandle
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jsl $E10000
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plx
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ply ; handle
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pha
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pea @return_b ; ptr
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phy
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phx ; handle
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pha
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pea @return_e-@return_b ; size
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tya
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xba
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sta @handle2+2
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stx @handle2+1
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inx
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inx
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sta @handle1+2
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stx @handle1+1
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lda #$FB18 ; CLC / XCE
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sta PatchQuit
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lda #$005C ; JML
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sta PatchQuit+2
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@handle1
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lda $D1D1D1 ; SMC
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sta PatchQuit+5
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xba
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sta @copycallback+2
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@handle2
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lda $D1D1D1 ; SMC
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sta PatchQuit+3
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adc #@callback_b-@return_b
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sta @copycallback+1
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ldx #$2802 ; PtrToHand
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jsl $E10000 ; copy hook code to allocated memory
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sec
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xce
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rts
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@return_b
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rep #$30 ; called from 8-bit code but with e=0
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ldx #((@callback_e-@callback_b)+1) and -2
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@copycallback
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lda $D1D1D1,x ; SMC
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sta $BF00,x
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dex
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dex
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bpl @copycallback
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@userID pea $D1D1 ; SMC
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ldx #$1102 ; DisposeAll
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phb
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pea ($BF00+@jmpGSOS-@callback_b)-1
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jmp $E10000
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@callback_b
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!cpu 65C02
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plx
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inx
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inx
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inx
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phx
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lda #$B3
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sta $204
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lda #0
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sta $280
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rts
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!cpu 65816
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@jmpGSOS
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sep #$30 ; revert to 8-bit mode
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jmp $E0D000
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@callback_e
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@return_e
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!cpu 6502
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