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104 lines
1.9 KiB
ArmAsm
104 lines
1.9 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 20.11.2000
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;
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; CC65 runtime: Support for calling module constructors/destructors
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;
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; The condes routine must be called with the table address in a/x and the
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; size of the table in y. The current implementation limits the table size
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; to 254 bytes (127 vectors) but this shouldn't be problem for now and may
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; be changed later.
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;
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; libinit and libdone call condes with the predefined module constructor and
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; destructor tables, they must be called from the platform specific startup
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; code.
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;
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; The function does also export jmpvec as general purpose jump vector that
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; lies in the data segment so it's address may be patched at runtime.
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;
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.export initlib, donelib, condes
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.export jmpvec
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.import __CONSTRUCTOR_TABLE__, __CONSTRUCTOR_COUNT__
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.import __DESTRUCTOR_TABLE__, __DESTRUCTOR_COUNT__
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.code
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; --------------------------------------------------------------------------
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; Initialize library modules
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.proc initlib
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lda #<__CONSTRUCTOR_TABLE__
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ldx #>__CONSTRUCTOR_TABLE__
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ldy #<(__CONSTRUCTOR_COUNT__*2)
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bne condes
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Cleanup library modules
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.proc donelib
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lda #<__DESTRUCTOR_TABLE__
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ldx #>__DESTRUCTOR_TABLE__
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ldy #<(__DESTRUCTOR_COUNT__*2)
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bne condes
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Generic table call handler
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.proc condes
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sta getbyt+1
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stx getbyt+2
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sty index
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loop: ldy index
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beq done
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dey
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jsr getbyt
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sta jmpvec+2
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dey
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jsr getbyt
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sta jmpvec+1
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sty index
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jsr jmpvec
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.ifpc02
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bra loop
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.else
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jmp loop
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.endif
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done: rts
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.endproc
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; --------------------------------------------------------------------------
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; Data. The getbyte routine is placed in the data segment cause it's patched
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; at runtime.
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.bss
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index: .byte 0
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.data
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getbyt: lda $FFFF,y
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rts
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jmpvec: jmp $FFFF
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