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cc65/libsrc/c64/irq.s

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Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
;
; IRQ handling (C64 version)
;
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.export initirq, doneirq
.import callirq
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.include "c64.inc"
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
Renamed INITBSS to INIT and INIT to ONCE. The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name. Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization.
2016-03-06 20:26:22 +00:00
.segment "ONCE"
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
initirq:
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
lda IRQVec
ldx IRQVec+1
sta IRQInd+1
stx IRQInd+2
lda #<IRQStub
ldx #>IRQStub
jmp setvec
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
.code
doneirq:
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
lda IRQInd+1
ldx IRQInd+2
setvec: sei
sta IRQVec
stx IRQVec+1
cli
rts
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.segment "LOWCODE"
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
IRQStub:
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
cld ; Just to be sure
jsr callirq ; Call the functions
jmp IRQInd ; Jump to the saved IRQ vector
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
.data
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
IRQInd: jmp $0000
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