1 /* Copyright (C) 1997-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
18 /* clone() is even more special than fork() as it mucks with stacks
19 and invokes a function in the right context after its all over. */
21 #include <asm/errno.h>
22 #include <tcb-offsets.h>
25 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
26 pid_t *ptid, void *tls, pid_t *ctid); */
28 .register %g2,#scratch
29 .register %g3,#scratch
35 cfi_def_cfa_register(%fp)
37 cfi_register(%o7, %i7)
39 /* sanity check arguments */
40 brz,pn %i0, 99f /* fn non-NULL? */
42 brz,pn %i1, 99f /* child_stack non-NULL? */
43 mov %i2, %o0 /* clone flags */
45 /* The child_stack is the top of the stack, allocate one
46 whole stack frame from that as this is what the kernel
47 expects. Also, subtract STACK_BIAS. */
48 sub %i1, 192 + 0x7ff, %o1
51 mov %i4,%o2 /* PTID */
53 ldx [%fp+0x7ff+176],%o4 /* CTID */
55 /* Do the system call */
60 brnz,pn %o1, __thread_start
65 98: call HIDDEN_JUMPTARGET(__errno_location)
72 .type __thread_start,@function
74 mov %g0, %fp /* terminate backtrace */
81 .size __thread_start, .-__thread_start
83 libc_hidden_def (__clone)
84 weak_alias (__clone, clone)