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Interruptor support

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3492 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
2005-04-27 18:01:57 +00:00
parent cbdcab4fdb
commit 066b07c6ce
1 changed files with 97 additions and 90 deletions
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187
libsrc/apple2/crt0.s
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@@ -4,168 +4,169 @@
; This must be the *first* file on the linker command line ; This must be the *first* file on the linker command line
; ;
.export _exit .export _exit
.import zerobss .import zerobss
.import initlib, donelib .import initlib, donelib
.import callmain, callirq .import callmain, callirq
.import COUT .import COUT
.import __STARTUP_LOAD__, __BSS_LOAD__ ; Linker generated .import __STARTUP_LOAD__, __BSS_LOAD__ ; Linker generated
.import __INTERRUPTOR_COUNT__ ; Linker generated .import __INTERRUPTOR_COUNT__ ; Linker generated
.include "zeropage.inc" .include "zeropage.inc"
.include "apple2.inc" .include "apple2.inc"
.include "mli.inc" .include "mli.inc"
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.segment "EXEHDR" .segment "EXEHDR"
.addr __STARTUP_LOAD__ ; Start address .addr __STARTUP_LOAD__ ; Start address
.word __BSS_LOAD__ - __STARTUP_LOAD__ ; Size .word __BSS_LOAD__ - __STARTUP_LOAD__ ; Size
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.segment "STARTUP" .segment "STARTUP"
; ProDOS TechRefMan, chapter 5.2.1: ; ProDOS TechRefMan, chapter 5.2.1:
; "For maximum interrupt efficiency, a system program should not ; "For maximum interrupt efficiency, a system program should not
; use more than the upper 3/4 of the stack." ; use more than the upper 3/4 of the stack."
ldx #$FF ldx #$FF
txs ; Init stack pointer txs ; Init stack pointer
; Delegate all further processing to keep STARTUP small ; Delegate all further processing to keep STARTUP small
jsr init jsr init
; Avoid re-entrance of donelib. This is also the _exit entry ; Avoid re-entrance of donelib. This is also the _exit entry
_exit: ldx #<exit _exit: ldx #<exit
lda #>exit lda #>exit
jsr reset ; Setup RESET vector jsr reset ; Setup RESET vector
; Check for valid interrupt vector table entry number ; Check for valid interrupt vector table entry number
lda intnum lda intnum
beq :+ beq :+
; Deallocate interrupt vector table entry ; Deallocate interrupt vector table entry
dec params ; Adjust parameter count dec params ; Adjust parameter count
jsr ENTRY jsr ENTRY
.byte $41 ; Dealloc interrupt .byte $41 ; Dealloc interrupt
.addr params .addr params
; Call module destructors ; Call module destructors
: jsr donelib : jsr donelib
; Restore the original RESET vector ; Restore the original RESET vector
exit: ldx #$02 exit: ldx #$02
: lda rvsave,x : lda rvsave,x
sta SOFTEV,x sta SOFTEV,x
dex dex
bpl :- bpl :-
; Copy back the zero page stuff ; Copy back the zero page stuff
ldx #zpspace-1 ldx #zpspace-1
: lda zpsave,x : lda zpsave,x
sta sp,x sta sp,x
dex dex
bpl :- bpl :-
; ProDOS TechRefMan, chapter 5.2.1: ; ProDOS TechRefMan, chapter 5.2.1:
; "System programs should set the stack pointer to $FF at the ; "System programs should set the stack pointer to $FF at the
; warm-start entry point." ; warm-start entry point."
ldx #$FF ldx #$FF
txs ; Re-init stack pointer txs ; Re-init stack pointer
; Back to DOS ; Back to DOS
jmp DOSWARM jmp DOSWARM
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.segment "INIT" .segment "INIT"
; Save the zero page locations we need ; Save the zero page locations we need
init: ldx #zpspace-1 init: ldx #zpspace-1
: lda sp,x : lda sp,x
sta zpsave,x sta zpsave,x
dex dex
bpl :- bpl :-
; Save the original RESET vector ; Save the original RESET vector
ldx #$02 ldx #$02
: lda SOFTEV,x : lda SOFTEV,x
sta rvsave,x sta rvsave,x
dex dex
bpl :- bpl :-
; ProDOS TechRefMan, chapter 5.3.5: ; ProDOS TechRefMan, chapter 5.3.5:
; "Your system program should place in the RESET vector the ; "Your system program should place in the RESET vector the
; address of a routine that ... closes the files." ; address of a routine that ... closes the files."
ldx #<_exit ldx #<_exit
lda #>_exit lda #>_exit
jsr reset ; Setup RESET vector jsr reset ; Setup RESET vector
; Clear the BSS data ; Clear the BSS data
jsr zerobss jsr zerobss
; Setup the stack ; Setup the stack
lda HIMEM lda HIMEM
sta sp sta sp
lda HIMEM+1 lda HIMEM+1
sta sp+1 ; Set argument stack ptr sta sp+1 ; Set argument stack ptr
; Call module constructors ; Call module constructors
jsr initlib jsr initlib
; Check for interruptors ; Check for interruptors
lda #<__INTERRUPTOR_COUNT__ lda #<__INTERRUPTOR_COUNT__
beq :+ beq :+
; Check for ProDOS ; Check for ProDOS
lda ENTRY lda ENTRY
cmp #$4C ; Is MLI present? (JMP opcode) cmp #$4C ; Is MLI present? (JMP opcode)
bne prterr bne prterr
; Allocate interrupt vector table entry ; Allocate interrupt vector table entry
jsr ENTRY jsr ENTRY
.byte $40 ; Alloc interrupt .byte $40 ; Alloc interrupt
.addr params .addr params
bcs prterr bcs prterr
; Push arguments and call main() ; Push arguments and call main()
: jmp callmain : jmp callmain
; Print error message and return ; Print error message and return
prterr: ldx #msglen-1 prterr: ldx #msglen-1
: lda errmsg,x : lda errmsg,x
jsr COUT jsr COUT
dex dex
bpl :- bpl :-
rts rts
errmsg: .ifdef __APPLE2ENH__ errmsg: .ifdef __APPLE2ENH__
.byte $8D, 't'|$80, 'p'|$80, 'u'|$80, 'r'|$80, 'r'|$80 .byte $8D, 't'|$80, 'p'|$80, 'u'|$80, 'r'|$80, 'r'|$80
.byte 'e'|$80, 't'|$80, 'n'|$80, 'i'|$80, ' '|$80, 'c'|$80 .byte 'e'|$80, 't'|$80, 'n'|$80, 'i'|$80, ' '|$80, 'c'|$80
.byte 'o'|$80, 'l'|$80, 'l'|$80, 'a'|$80, ' '|$80, 'o'|$80 .byte 'o'|$80, 'l'|$80, 'l'|$80, 'a'|$80, ' '|$80, 'o'|$80
.byte 't'|$80, ' '|$80, 'd'|$80, 'e'|$80, 'l'|$80, 'i'|$80 .byte 't'|$80, ' '|$80, 'd'|$80, 'e'|$80, 'l'|$80, 'i'|$80
.byte 'a'|$80, 'F'|$80, $8D .byte 'a'|$80, 'F'|$80, $8D
.else .else
.byte $8D, 'T'|$80, 'P'|$80, 'U'|$80, 'R'|$80, 'R'|$80 .byte $8D, 'T'|$80, 'P'|$80, 'U'|$80, 'R'|$80, 'R'|$80
.byte 'E'|$80, 'T'|$80, 'N'|$80, 'I'|$80, ' '|$80, 'C'|$80 .byte 'E'|$80, 'T'|$80, 'N'|$80, 'I'|$80, ' '|$80, 'C'|$80
.byte 'O'|$80, 'L'|$80, 'L'|$80, 'A'|$80, ' '|$80, 'O'|$80 .byte 'O'|$80, 'L'|$80, 'L'|$80, 'A'|$80, ' '|$80, 'O'|$80
.byte 'T'|$80, ' '|$80, 'D'|$80, 'E'|$80, 'L'|$80, 'I'|$80 .byte 'T'|$80, ' '|$80, 'D'|$80, 'E'|$80, 'L'|$80, 'I'|$80
.byte 'A'|$80, 'F'|$80, $8D .byte 'A'|$80, 'F'|$80, $8D
.endif .endif
msglen = * - errmsg msglen = * - errmsg
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.segment "LOWCODE" .segment "LOWCODE"
; ProDOS TechRefMan, chapter 6.2: ; ProDOS TechRefMan, chapter 6.2:
; "Each installed routine must begin with a CLD instruction" ; "Each installed routine must begin with a CLD instruction."
intrpt: cld intrpt: cld
; Call interruptors ; Call interruptors and check for success
jsr callirq jsr callirq
bcc :+
; ProDOS TechRefMan, chapter 6.2: ; ProDOS TechRefMan, chapter 6.2:
; "When the routine that can process the interrupt is called, it ; "When the routine that can process the interrupt is called, it
@@ -173,25 +174,31 @@ intrpt: cld
clc clc
rts rts
; ProDOS TechRefMan, chapter 6.2:
; "When a routine that cannot process the interrupt is called,
; it should return (via an RTS) with the cary flag set ..."
: sec
rts
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.code .code
; Setup RESET vector ; Setup RESET vector
reset: stx SOFTEV reset: stx SOFTEV
sta SOFTEV+1 sta SOFTEV+1
eor #$A5 eor #$A5
sta PWREDUP sta PWREDUP
rts rts
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.data .data
zpsave: .res zpspace zpsave: .res zpspace
rvsave: .res 3 rvsave: .res 3
params: .byte $02 ; Parameter count params: .byte $02 ; Parameter count
intnum: .byte $00 ; Interrupt number intnum: .byte $00 ; Interrupt number
.addr intrpt ; Interrupt handler .addr intrpt ; Interrupt handler