| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| #include <pthread.h> |
| |
| struct user_desc { |
| unsigned int entry_number; |
| unsigned long base_addr; |
| unsigned int limit; |
| unsigned int seg_32bit:1; |
| unsigned int contents:2; |
| unsigned int read_exec_only:1; |
| unsigned int limit_in_pages:1; |
| unsigned int seg_not_present:1; |
| unsigned int useable:1; |
| unsigned int empty:25; |
| }; |
| |
| /* the following can't be const, since the first call will |
| * update the 'entry_number' field |
| */ |
| static struct user_desc _tls_desc = |
| { |
| -1, |
| 0, |
| 0x1000, |
| 1, |
| 0, |
| 0, |
| 1, |
| 0, |
| 1, |
| 0 |
| }; |
| |
| /* we implement thread local storage through the fs: segment descriptor |
| * we create a segment descriptor for the tls |
| */ |
| int __set_tls(void *ptr) |
| { |
| int rc, segment; |
| |
| _tls_desc.base_addr = (unsigned long)ptr; |
| |
| rc = __set_thread_area( &_tls_desc ); |
| if (rc != 0) |
| { |
| /* could not set thread local area */ |
| return -1; |
| } |
| |
| /* this weird computation comes from GLibc */ |
| segment = _tls_desc.entry_number*8 + 3; |
| asm __volatile__ ( |
| " movw %w0, %%fs" :: "r"(segment) |
| ); |
| return 0; |
| } |
| |
| |
| |