1 /* Copyright (C) 2005, 2010 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 <http://www.gnu.org/licenses/>. */
18 #include <tcb-offsets.h>
20 /* Save the PID value. */
22 str lr, [sp, #-4]!; /* Save LR. */ \
23 cfi_adjust_cfa_offset (4); \
24 cfi_rel_offset (lr, 0); \
25 mov r0, #0xffff0fff; /* Point to the high page. */ \
26 mov lr, pc; /* Save our return address. */ \
27 sub pc, r0, #31; /* Jump to the TLS entry. */ \
28 ldr lr, [sp], #4; /* Restore LR. */ \
29 cfi_adjust_cfa_offset (-4); \
31 mov r2, r0; /* Save the TLS addr in r2. */ \
32 ldr r3, [r2, #PID_OFFSET]; /* Load the saved PID. */ \
33 rsbs r0, r3, #0; /* Negate it. */ \
34 moveq r0, #0x80000000; /* Use 0x80000000 if it was 0. */ \
35 str r0, [r2, #PID_OFFSET] /* Store the temporary PID. */
37 /* Restore the old PID value in the parent. */
39 cmp r0, #0; /* If we are the parent... */ \
40 strne r3, [r2, #PID_OFFSET] /* ... restore the saved PID. */