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[glibc.git] / nptl / sysdeps / unix / sysv / linux / i386 / createthread.c
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1 /* Copyright (C) 2002-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 /* The "thread register" gets initialized from a segment descriptor.
20 Initialize such a descriptor first. */
21 #define PREPARE_CREATE \
22 union user_desc_init desc; \
24 /* Describe the thread-local storage segment. */ \
26 /* The 'entry_number' field. The first three bits of the segment \
27 register value select the GDT, ignore them. We get the index \
28 from the value of the %gs register in the current thread. */ \
29 desc.vals[0] = TLS_GET_GS () >> 3; \
30 /* The 'base_addr' field. Pointer to the TCB. */ \
31 desc.vals[1] = (unsigned long int) pd; \
32 /* The 'limit' field. We use 4GB which is 0xfffff pages. */ \
33 desc.vals[2] = 0xfffff; \
34 /* Collapsed value of the bitfield: \
35 .seg_32bit = 1 \
36 .contents = 0 \
37 .read_exec_only = 0 \
38 .limit_in_pages = 1 \
39 .seg_not_present = 0 \
40 .useable = 1 */ \
41 desc.vals[3] = 0x51
43 /* Value passed to 'clone' for initialization of the thread register. */
44 #define TLS_VALUE &desc.desc
47 /* Get the real implementation. */
48 #include <nptl/sysdeps/pthread/createthread.c>