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cc65/libsrc/common/_heap.s
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ArmAsm

;
; Ullrich von Bassewitz, 03.06.1998
;
; Heap variables and initialization.
;
.export __horg, __hptr, __hend, __hfirst, __hlast
.export __hinit
.import __BSS_RUN__, __BSS_SIZE__, __stksize
.importzp sp
.data
__horg:
.word __BSS_RUN__+__BSS_SIZE__ ; Linker calculates this symbol
__hptr:
.word __BSS_RUN__+__BSS_SIZE__ ; Dito
__hend:
.word __BSS_RUN__+__BSS_SIZE__
__hfirst:
.word 0
__hlast:
.word 0
;
; Initialization. Must be called from startup!
;
.code
__hinit:
sec
lda sp
sbc __stksize
sta __hend
lda sp+1
sbc __stksize+1
sta __hend+1
rts