1 /* Copyright (C) 1997-2014 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); */
33 .register %g2,#scratch
34 .register %g3,#scratch
40 cfi_def_cfa_register(%fp)
42 cfi_register(%o7, %i7)
44 /* sanity check arguments */
45 brz,pn %i0, 99f /* fn non-NULL? */
47 brz,pn %i1, 99f /* child_stack non-NULL? */
48 mov %i2, %o0 /* clone flags */
50 /* The child_stack is the top of the stack, allocate one
51 whole stack frame from that as this is what the kernel
52 expects. Also, subtract STACK_BIAS. */
53 sub %i1, 192 + 0x7ff, %o1
57 mov %i4,%o2 /* PTID */
59 ldx [%fp+0x7ff+176],%o4 /* CTID */
61 /* Do the system call */
66 brnz,pn %o1, __thread_start
71 98: call HIDDEN_JUMPTARGET(__errno_location)
78 .type __thread_start,@function
81 sethi %hi(CLONE_THREAD), %l0
84 andcc %g4, CLONE_VM, %g0
93 mov %g0, %fp /* terminate backtrace */
96 call HIDDEN_JUMPTARGET(_exit),0
99 .size __thread_start, .-__thread_start
101 weak_alias (__clone, clone)