1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Richard Henderson <rth@tamu.edu>, 1996.
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>
26 #include <sys/syscall.h>
27 #include <sys/regdef.h>
29 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
40 /* Sanity check arguments. */
42 beq a0,$error /* no NULL function pointers */
43 beq a1,$error /* no NULL stack pointers */
45 /* Save the fn ptr and arg on the new stack. */
50 /* Do the system call */
58 /* Successful return from the parent */
61 /* Something bad happened -- no child created */
65 jmp zero,__syscall_error
69 /* Load up the arguments to the function. Put this block of code in
70 its own function so that we can terminate the stack trace with our
79 /* Load up the arguments. */
84 /* Call the user's function */
88 /* Call _exit rather than doing it inline for breakpoint purposes */
90 jsr ra,HIDDEN_JUMPTARGET(_exit)