1*2fe8fb19SBen Gras/* $NetBSD: fork.S,v 1.6 2011/01/15 07:31:13 matt Exp $ */ 2*2fe8fb19SBen Gras 3*2fe8fb19SBen Gras/* 4*2fe8fb19SBen Gras * pid = fork(); 5*2fe8fb19SBen Gras * 6*2fe8fb19SBen Gras * r4 == 0 in parent process, 1 in child process. 7*2fe8fb19SBen Gras * r3 == pid of child in parent, pid of parent in child. 8*2fe8fb19SBen Gras */ 9*2fe8fb19SBen Gras 10*2fe8fb19SBen Gras#include "SYS.h" 11*2fe8fb19SBen Gras 12*2fe8fb19SBen Gras_SYSCALL(__fork,fork) 13*2fe8fb19SBen Gras addi %r4,%r4,-1 # from 1 to 0 in child, 0 to -1 in parent 14*2fe8fb19SBen Gras and %r3,%r3,%r4 # return 0 in child, pid in parent 15*2fe8fb19SBen Gras blr 16*2fe8fb19SBen GrasEND(__fork) 17