1 /* Wrapper around clone system call. PowerPC64 version.
2 Copyright (C) 1997,98,99,2000,02,04, 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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/>. */
21 #include <bits/errno.h>
25 #define CLONE_VM 0x00000100
26 #define CLONE_THREAD 0x00010000
28 /* This is the only really unusual system call in PPC linux, but not
29 because of any weirdness in the system call itself; because of
30 all the freaky stuff we have to do to make the call useful. */
32 /* int [r3] clone(int (*fn)(void *arg) [r3], void *child_stack [r4],
33 int flags [r5], void *arg [r6], void *parent_tid [r7],
34 void *tls [r8], void *child_tid [r9]); */
36 ENTRY (BP_SYM (__clone))
38 /* GKM FIXME: add bounds checks, where sensible. */
42 /* Check for child_stack == NULL || fn == NULL. */
45 cror cr0*4+eq,cr1*4+eq,cr0*4+eq
48 /* Save some regs in parm save area. */
60 /* Set up stack frame for child. */
63 stdu r0,-112(r4) /* min stack frame is 112 bytes per ABI */
65 /* Save fn, args, stack across syscall. */
66 mr r30,r3 /* Function in r30. */
68 mr r29,r5 /* Flags in r29. */
70 mr r31,r6 /* Argument in r31. */
72 /* 'flags' argument is first parameter to clone syscall.
73 Second is the stack pointer, already in r4. */
75 /* Move the parent_tid, child_tid and tls arguments. */
80 /* End FDE now, because in the child the unwind info will be
85 DO_CALL(SYS_ify(clone))
87 /* Check for child process. */
89 crandc cr1*4+eq,cr1*4+eq,cr0*4+so
90 bne- cr1,L(parent) /* The '-' is to minimise the race. */
93 andis. r0,r29,CLONE_THREAD>>16
97 bne- cr0,L(nomoregetpid)
98 DO_CALL(SYS_ify(getpid))
106 /* Call procedure. */
113 /* Call _exit with result from procedure. */
115 b JUMPTARGET(__GI__exit)
118 /* We won't ever get here but provide a nop so that the linker
119 will insert a toc adjusting stub if necessary. */
126 TAIL_CALL_SYSCALL_ERROR
129 /* Parent. Restore registers & return. */
147 END (BP_SYM (__clone))
149 weak_alias (BP_SYM (__clone), BP_SYM (clone))