1 /* Copyright (C) 1996, 1997, 1998, 2000, 2003, 2004, 2007
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Richard Henderson (rth@tamu.edu).
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 /* clone() is even more special than fork() as it mucks with stacks
22 and invokes a function in the right context after its all over. */
24 #include <asm/errno.h>
25 #include <asm/unistd.h>
26 #include <tcb-offsets.h>
29 #define CLONE_VM 0x00000100
30 #define CLONE_THREAD 0x00010000
32 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
33 pid_t *ptid, void *tls, pid_t *ctid); */
38 cfi_def_cfa_register(%fp)
40 cfi_register(%o7, %i7)
42 /* sanity check arguments */
49 /* The child_stack is the top of the stack, allocate one
50 whole stack frame from that as this is what the kernel
63 /* Do the system call */
76 call HIDDEN_JUMPTARGET(__errno_location)
83 .type __thread_start,@function
86 sethi %hi(CLONE_THREAD), %l0
89 andcc %g4, CLONE_VM, %g0
99 mov %g0, %fp /* terminate backtrace */
102 call HIDDEN_JUMPTARGET(_exit),0
105 .size __thread_start, .-__thread_start
107 weak_alias (__clone, clone)