/* 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, see <http://www.gnu.org/licenses/>. */ /* 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> #include <sys/syscall.h> #include <sys/regdef.h> /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ .text .globl clone; .align 3; .ent clone , 0; clone: .frame $30 , 0, $26 .prologue 0 /* Sanity check arguments. */ ldiq v0,EINVAL beq a0,$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: br gp,1f 1: ldgp gp,0(gp) 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,HIDDEN_JUMPTARGET(_exit) /* Die horribly. */ halt .end thread_start