1 /* Copyright (C) 1996,97,98,2002,2010 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 /* clone() is even more special than fork() as it mucks with stacks
21 and invokes a function in the right context after its all over. */
25 #include <bits/errno.h>
30 #define CLONE_VM 0x00000100
31 #define CLONE_THREAD 0x00010000
33 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
34 void *parent_tidptr, void *tls, void *child_tidptr) */
39 /* Sanity check arguments. */
41 movel 4(%sp), %a0 /* no NULL function pointers */
43 jeq SYSCALL_ERROR_LABEL
44 movel 8(%sp), %a1 /* no NULL stack pointers */
46 jeq SYSCALL_ERROR_LABEL
48 /* Allocate space and copy the argument onto the new stack. */
51 /* Do the system call */
52 movel 12+0(%sp), %d1 /* get flags */
53 movel %d3, -(%a1) /* save %d3 and get parent_tidptr */
56 movel %d4, -(%a1) /* save %d4 and get child_tidptr */
59 movel %d5, -(%a1) /* save %d5 and get tls */
62 /* save %d2 and get stack pointer */
68 exg %d2, %a1 /* save %d2 and get stack pointer */
70 movel #SYS_ify (clone), %d0
75 exg %d2, %a1 /* restore %d2 */
77 movel (%sp)+, %d5 /* restore %d5, %d4 and %d3 */
82 jmi SYSCALL_ERROR_LABEL
89 cfi_undefined (pc) /* Mark end of stack */
90 subl %fp, %fp /* terminate the stack frame */
92 /* Check and see if we need to reset the PID. */
94 andl #CLONE_THREAD, %d1
100 movel #SYS_ify (getpid), %d0
105 bsrl __m68k_read_tp@PLTPC
107 movel %d0, PID_OFFSET(%a0)
108 movel %d0, TID_OFFSET(%a0)
114 movel #SYS_ify (exit), %d0
120 weak_alias (__clone, clone)