ack/mach/m68020/libem/shp.s

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524 B
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.define .strhp
.sect .text
.sect .rom
.sect .data
.sect .bss
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EHEAP=17
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.sect .text
.strhp:
move.l (sp)+, a0
move.l (sp), d1 ! new heap pointer
cmp.l (.limhp), d1 ! compare new heap pointer with limit
blt 1f
add.l #0x400, d1
and.l #~0x3ff, d1
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move.l a0,-(sp)
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move.l d1, -(sp)
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move.l d1,(.limhp)
jsr (__brk) ! allocate 1K bytes of extra storage
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add.l #4,sp
move.l (sp)+,a0
tst.l d0
bne 2f
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1:
move.l (sp)+, (.reghp) ! store new value
jmp (a0) ! return
2:
move.l #EHEAP, -(sp)
jsr (.trp)
jmp (a0)
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.align 2