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