ack/mach/vax4/libbsd4_2/vfork.s

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ArmAsm
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#include "syscall.h"
DEFINE(_vfork)
movl 16(fp),r2
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movab Inewret,16(fp)
ret ! cleans stack
Inewret:
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chmk $SYS_vfork
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bcs Ierr
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tstl r1
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beql Iparent
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clrl r0
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Iparent:
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jmp (r2)
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Ierr:
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movl r0,_errno
mnegl $1,r0
jmp (r2)