the10thwiz/cc65
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use new callirq function

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@2970 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2004-04-04 14:28:57 +00:00
parent 5e50355f2a
commit 0d7cf8ebce
7 changed files with 413 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
libsrc/plus4/crt0.s
View File

@@ -7,9 +7,9 @@
.export _exit
.export brk_jmp
.import condes, initlib, donelib
.import callirq_y, initlib, donelib
.import push0, callmain, zerobss
.import __IRQFUNC_TABLE__, __IRQFUNC_COUNT__
.import __IRQFUNC_COUNT__
.include "zeropage.inc"
.include "plus4.inc"
@@ -59,7 +59,7 @@ L1: lda sp,x
; usable RAM.
tsx
stx spsave ; save system stk ptr
stx spsave ; save system stk ptr
lda #<$FD00
sta sp
@@ -96,7 +96,7 @@ L1: lda sp,x
; Back from main (this is also the _exit entry). Run module destructors.
_exit: pha ; Save the return code
_exit: pha ; Save the return code
lda #0
sta irqcount ; Disable custom IRQ handlers
jsr donelib ; Run module destructors
@@ -153,9 +153,7 @@ IRQ: cld ; Just to be sure
ldy irqcount
beq @L1
lda #<__IRQFUNC_TABLE__
ldx #>__IRQFUNC_TABLE__
jsr condes ; Call the IRQ functions
jsr callirq_y ; Call the IRQ functions
; Since the ROM handler will end with an RTI, we have to fake an IRQ return
; on stack, so we get control of the CPU after the ROM handler and can switch
@@ -165,10 +163,10 @@ IRQ: cld ; Just to be sure
pha
lda #<irq_ret
pha
php ; Push faked IRQ frame on stack
pha ; Push faked A register
pha ; Push faked X register
pha ; Push faked Y register
php ; Push faked IRQ frame on stack
pha ; Push faked A register
pha ; Push faked X register
pha ; Push faked Y register
sta ENABLE_ROM ; Switch to ROM
jmp (IRQVec) ; Jump indirect to kernal irq handler