/* Copyright (C) 1996, 1997, 1998, 2000, 2003, 2004, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Richard Henderson (rth@tamu.edu). 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 <asm/errno.h> #include <asm/unistd.h> #include <tcb-offsets.h> #include <sysdep.h> #define CLONE_VM 0x00000100 #define CLONE_THREAD 0x00010000 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, pid_t *ptid, void *tls, pid_t *ctid); */ .text ENTRY (__clone) save %sp,-96,%sp cfi_def_cfa_register(%fp) cfi_window_save cfi_register(%o7, %i7) /* sanity check arguments */ orcc %i0,%g0,%g2 be .Leinval orcc %i1,%g0,%o1 be .Leinval mov %i2,%o0 /* The child_stack is the top of the stack, allocate one whole stack frame from that as this is what the kernel expects. */ sub %o1, 96, %o1 mov %i3, %g3 mov %i2, %g4 /* ptid */ mov %i4,%o2 /* tls */ mov %i5,%o3 /* ctid */ ld [%fp+92],%o4 /* Do the system call */ set __NR_clone,%g1 ta 0x10 bcs .Lerror tst %o1 bne __thread_start nop jmpl %i7 + 8, %g0 restore %o0,%g0,%o0 .Leinval: mov EINVAL, %o0 .Lerror: call __errno_location mov %o0, %i0 st %i0,[%o0] jmpl %i7 + 8, %g0 restore %g0,-1,%o0 END(__clone) .type __thread_start,@function __thread_start: #ifdef RESET_PID sethi %hi(CLONE_THREAD), %l0 andcc %g4, %l0, %g0 bne 1f andcc %g4, CLONE_VM, %g0 bne,a 2f mov -1,%o0 set __NR_getpid,%g1 ta 0x10 2: st %o0,[%g7 + PID] st %o0,[%g7 + TID] 1: #endif mov %g0, %fp /* terminate backtrace */ call %g2 mov %g3,%o0 call exit,0 nop .size __thread_start, .-__thread_start weak_alias (__clone, clone)