475585655d
Summary: The Secondary allocator wraps the platform allocation primitives. It is meant to be used for larger sizes that the Primary can't fullfill, as it will be slower, and sizes are multiple of the system page size. This also changes some of the existing code, notably the opaque platform data being passed to the platform specific functions: we can shave a couple of syscalls on Fuchsia by storing additional data (this addresses a TODO). Reviewers: eugenis, vitalybuka, hctim, morehouse Reviewed By: morehouse Subscribers: mgorny, delcypher, jfb, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60787 llvm-svn: 359097
71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
//===-- linux.h -------------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef SCUDO_LINUX_H_
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#define SCUDO_LINUX_H_
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#include "platform.h"
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#if SCUDO_LINUX
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namespace scudo {
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// MapPlatformData is unused on Linux, define it as a minimally sized structure.
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struct MapPlatformData {};
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#if SCUDO_ANDROID
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#if defined(__aarch64__)
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#define __get_tls() \
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({ \
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void **__v; \
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__asm__("mrs %0, tpidr_el0" : "=r"(__v)); \
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__v; \
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})
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#elif defined(__arm__)
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#define __get_tls() \
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({ \
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void **__v; \
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__asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); \
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__v; \
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})
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#elif defined(__i386__)
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#define __get_tls() \
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({ \
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void **__v; \
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__asm__("movl %%gs:0, %0" : "=r"(__v)); \
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__v; \
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})
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#elif defined(__x86_64__)
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#define __get_tls() \
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({ \
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void **__v; \
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__asm__("mov %%fs:0, %0" : "=r"(__v)); \
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__v; \
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})
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#else
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#error "Unsupported architecture."
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#endif
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// The Android Bionic team has allocated a TLS slot for sanitizers starting
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// with Q, given that Android currently doesn't support ELF TLS. It is used to
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// store sanitizer thread specific data.
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static const int TLS_SLOT_SANITIZER = 8; // TODO(kostyak): 6 for Q!!
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ALWAYS_INLINE uptr *getAndroidTlsPtr() {
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return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_SANITIZER]);
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}
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#endif // SCUDO_ANDROID
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} // namespace scudo
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#endif // SCUDO_LINUX
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#endif // SCUDO_LINUX_H_
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