diff options
author | Austin Foxley <austinf@cetoncorp.com> | 2009-09-19 10:04:05 -0700 |
---|---|---|
committer | Austin Foxley <austinf@cetoncorp.com> | 2009-09-26 09:37:18 -0700 |
commit | 534661b91c98492995274c364c8177c45efc63db (patch) | |
tree | 333c655a3159fdb72a693a7335ba347094dfd57a /ldso/ldso/arm/thumb_atomics.S | |
parent | d21497f9fba95688e464ae712bd6b4c0fbc4ea13 (diff) |
ldso/: tls support for dynamic linker
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
Diffstat (limited to 'ldso/ldso/arm/thumb_atomics.S')
-rw-r--r-- | ldso/ldso/arm/thumb_atomics.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/ldso/ldso/arm/thumb_atomics.S b/ldso/ldso/arm/thumb_atomics.S new file mode 100644 index 000000000..f6ae3db3c --- /dev/null +++ b/ldso/ldso/arm/thumb_atomics.S @@ -0,0 +1,79 @@ +/* Copyright (C) 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <features.h> + +#ifdef __UCLIBC_HAS_THREADS_NATIVE__ + +#include <sysdep.h> + +#if defined __thumb__ + +/* Out-of-line atomic operations that we can't do in Thumb mode. + This ends up in various libraries where it is needed (and + a few .a archives where it isn't). */ + + .hidden __thumb_swpb +ENTRY (__thumb_swpb) + swpb r0, r0, [r1] + bx lr +END (__thumb_swpb) + + .hidden __thumb_swp +ENTRY (__thumb_swp) + swp r0, r0, [r1] + bx lr +END (__thumb_swp) + + .hidden __thumb_cmpxchg +ENTRY (__thumb_cmpxchg) + stmdb sp!, {r4, lr} + mov r4, r0 +0: ldr r3, [r2] + cmp r3, r4 + bne 1f + mov r0, r4 + mov r3, #0xffff0fff + mov lr, pc + add pc, r3, #(0xffff0fc0 - 0xffff0fff) + bcc 0b + mov r3, r4 +1: mov r0, r3 + ldmia sp!, {r4, pc} +END (__thumb_cmpxchg) + +#endif /* __thumb__ */ +#endif /* __UCLIBC_HAS_THREADS_NATIVE__ */ + |