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Added support for chained interrupt handlers installed with .condes type 2.
git-svn-id: svn://svn.cc65.org/cc65/trunk@3953 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -8,9 +8,10 @@
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;
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.export _exit
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.import initlib, donelib
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.import push0, callmain, zerobss
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.import initlib, donelib, callirq
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.import callmain, zerobss
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.import MEMTOP, RESTOR, BSOUT, CLRCH
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.import __INTERRUPTOR_COUNT__
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.include "zeropage.inc"
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.include "../plus4/plus4.inc"
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@ -66,9 +67,24 @@ L1: lda sp,x
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MemOk: stx sp
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sty sp+1 ; set argument stack ptr
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; If we have IRQ functions, chain our stub into the IRQ vector
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lda #<__INTERRUPTOR_COUNT__
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beq NoIRQ1
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lda IRQVec
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ldx IRQVec+1
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sta IRQInd+1
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stx IRQInd+2
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lda #<IRQStub
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ldx #>IRQStub
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sei
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sta IRQVec
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stx IRQVec+1
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cli
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; Call module constructors
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jsr initlib
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NoIRQ1: jsr initlib
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; Push arguments and call main()
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@ -79,9 +95,21 @@ MemOk: stx sp
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_exit: pha ; Save the return code on stack
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jsr donelib ; Run module destructors
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; Reset the IRQ vector if we chained it.
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pha ; Save the return code on stack
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lda #<__INTERRUPTOR_COUNT__
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beq NoIRQ2
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lda IRQInd+1
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ldx IRQInd+2
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sei
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sta IRQVec
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stx IRQVec+1
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cli
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; Copy back the zero page stuff
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ldx #zpspace-1
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NoIRQ2: 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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@ -101,6 +129,20 @@ L2: lda zpsave,x
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jmp RESTOR
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; ------------------------------------------------------------------------
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; The IRQ vector jumps here, if condes routines are defined with type 2.
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IRQStub:
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cld ; Just to be sure
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jsr callirq ; Call the functions
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jmp IRQInd ; Jump to the saved IRQ vector
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; ------------------------------------------------------------------------
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; Data
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.data
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IRQInd: jmp $0000
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.segment "ZPSAVE"
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