/* Copyright (C) 1996, 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Richard Henderson <rth@tamu.edu>, 1996. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* clone() is even more special than fork() as it mucks with stacks and invokes a function in the right context after its all over. */ #include <features.h> #define _ERRNO_H 1 #include <bits/errno.h> /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ #define a0 $16 #define a1 $17 #define a2 $18 #define a3 $19 #define v0 $0 #define fp $15 #define gp $29 #define ra $26 #define pv $27 #define zero $31 .text .globl __clone; .align 3; .ent __clone , 0; __clone: .frame $30 , 0, $26 #ifdef PROF ldgp gp,0(pv) .set noat lda AT, _mcount jsr AT, (AT), _mcount .set at .prologue 1 #else .prologue 0 #endif /* Sanity check arguments. */ ldiq v0,EINVAL beq a0,$error /* no NULL function pointers */ beq a1,$error /* no NULL stack pointers */ /* Save the fn ptr and arg on the new stack. */ subq a1,16,a1 stq a0,0(a1) stq a3,8(a1) /* Do the system call */ mov a2,a0 ldiq v0,__NR_clone call_pal 131 bne a3,$error beq v0,thread_start /* Successful return from the parent */ ret /* Something bad happened -- no child created */ $error: #ifndef PROF br gp,1f 1: ldgp gp,0(gp) #endif jmp zero,__syscall_error .end __clone /* Load up the arguments to the function. Put this block of code in its own function so that we can terminate the stack trace with our debug info. */ .ent thread_start thread_start: .frame fp,0,zero,0 mov zero,fp .prologue 0 /* Load up the arguments. */ ldq pv,0($30) ldq a0,8($30) addq $30,16,$30 /* Call the user's function */ jsr ra,(pv) ldgp gp,0(ra) /* Call _exit rather than doing it inline for breakpoint purposes */ mov v0,a0 jsr ra,_exit /* Die horribly. */ halt .end thread_start .weak clone; clone = __clone