| /* |
| * Copyright (C) 2019 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 "private/bionic_elf_tls.h" |
| |
| #include <sys/param.h> |
| |
| #include "private/bionic_macros.h" |
| #include "private/bionic_tls.h" |
| |
| void StaticTlsLayout::reserve_tcb() { |
| offset_bionic_tcb_ = reserve_type<bionic_tcb>(); |
| } |
| |
| void StaticTlsLayout::reserve_bionic_tls() { |
| offset_bionic_tls_ = reserve_type<bionic_tls>(); |
| } |
| |
| void StaticTlsLayout::finish_layout() { |
| // Round the offset up to the alignment. |
| offset_ = round_up_with_overflow_check(offset_, alignment_); |
| } |
| |
| // The size is not required to be a multiple of the alignment. The alignment |
| // must be a positive power-of-two. |
| size_t StaticTlsLayout::reserve(size_t size, size_t alignment) { |
| offset_ = round_up_with_overflow_check(offset_, alignment); |
| const size_t result = offset_; |
| if (__builtin_add_overflow(offset_, size, &offset_)) overflowed_ = true; |
| alignment_ = MAX(alignment_, alignment); |
| return result; |
| } |
| |
| size_t StaticTlsLayout::round_up_with_overflow_check(size_t value, size_t alignment) { |
| const size_t old_value = value; |
| value = __BIONIC_ALIGN(value, alignment); |
| if (value < old_value) overflowed_ = true; |
| return value; |
| } |