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Working on the condes feature

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git-svn-id: svn://svn.cc65.org/cc65/trunk@464 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2000-11-21 10:51:53 +00:00
parent 23937f1dac
commit 8d94ef3fea
2 changed files with 57 additions and 7 deletions
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1
libsrc/runtime/Makefile
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@ -67,7 +67,6 @@ OBJS = add.o \
incsp6.o \
incsp7.o \
incsp8.o \
jmpvec.o \
ladd.o \
laddeq.o \
laddeqsp.o \

63
libsrc/runtime/condes.s
View File

@ -4,17 +4,62 @@
; CC65 runtime: Support for calling module constructors/destructors
;
; The condes routine must be called with the table address in a/x and the
; number of vectors in the table in y. The current implementation limits
; the table size to 128 bytes (64 vectors) but this shouldn't be problem
; for now and may be changed later.
; size of the table in y. The current implementation limits the table size
; to 254 bytes (127 vectors) but this shouldn't be problem for now and may
; be changed later.
;
; libinit and libdone call condes with the predefined module constructor and
; destructor tables, they must be called from the platform specific startup
; code.
;
; The function does also export jmpvec as general purpose jump vector that
; lies in the data segment so it's address may be patched at runtime.
;
.export condes
.import jmpvec
.export libinit, libdone, condes
.export jmpvec
.import __CONSTRUCTOR_TABLE__, __CONSTRUCTOR_COUNT__
.import __DESTRUCTOR_TABLE__, __DESTRUCTOR_COUNT__
.code
condes: sta getbyt+1
; --------------------------------------------------------------------------
; Initialize library modules
.proc libinit
lda #<__CONSTRUCTOR_TABLE__
ldx #>__CONSTRUCTOR_TABLE__
ldy #<(__CONSTRUCTOR_COUNT__*2)
bne condes
rts
.endproc
; --------------------------------------------------------------------------
; Cleanup library modules
.proc libdone
lda #<__DESTRUCTOR_TABLE__
ldx #>__DESTRUCTOR_TABLE__
ldy #<(__DESTRUCTOR_COUNT__*2)
bne condes
rts
.endproc
; --------------------------------------------------------------------------
; Generic table call handler
.proc condes
sta getbyt+1
stx getbyt+2
sty index
@ -32,6 +77,9 @@ loop: ldy index
done: rts
.endproc
; --------------------------------------------------------------------------
; Data. The getbyte routine is placed in the data segment cause it's patched
; at runtime.
@ -45,3 +93,6 @@ index: .byte 0
getbyt: lda $FFFF,y
rts
jmpvec: jmp $FFFF