1 /* Copyright (C) 1996-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Richard Henderson (rth@tamu.edu).
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, see
17 <http://www.gnu.org/licenses/>. */
19 /* clone() is even more special than fork() as it mucks with stacks
20 and invokes a function in the right context after its all over. */
22 #include <asm/errno.h>
23 #include <asm/unistd.h>
24 #include <tcb-offsets.h>
27 #define CLONE_VM 0x00000100
28 #define CLONE_THREAD 0x00010000
30 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
31 pid_t *ptid, void *tls, pid_t *ctid); */
36 cfi_def_cfa_register(%fp)
38 cfi_register(%o7, %i7)
40 /* sanity check arguments */
47 /* The child_stack is the top of the stack, allocate one
48 whole stack frame from that as this is what the kernel
61 /* Do the system call */
74 call HIDDEN_JUMPTARGET(__errno_location)
81 .type __thread_start,@function
83 sethi %hi(CLONE_THREAD), %l0
86 andcc %g4, CLONE_VM, %g0
95 mov %g0, %fp /* terminate backtrace */
98 call HIDDEN_JUMPTARGET(_exit),0
101 .size __thread_start, .-__thread_start
103 weak_alias (__clone, clone)