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//===-- linux.h -------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef SCUDO_LINUX_H_
#define SCUDO_LINUX_H_
#include "platform.h"
#if SCUDO_LINUX
namespace scudo {
// MapPlatformData is unused on Linux, define it as a minimally sized structure.
struct MapPlatformData {};
#if SCUDO_ANDROID
#if defined(__aarch64__)
#define __get_tls() \
({ \
void **__v; \
__asm__("mrs %0, tpidr_el0" : "=r"(__v)); \
__v; \
})
#elif defined(__arm__)
#define __get_tls() \
({ \
void **__v; \
__asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); \
__v; \
})
#elif defined(__i386__)
#define __get_tls() \
({ \
void **__v; \
__asm__("movl %%gs:0, %0" : "=r"(__v)); \
__v; \
})
#elif defined(__x86_64__)
#define __get_tls() \
({ \
void **__v; \
__asm__("mov %%fs:0, %0" : "=r"(__v)); \
__v; \
})
#else
#error "Unsupported architecture."
#endif
// The Android Bionic team has allocated a TLS slot for sanitizers starting
// with Q, given that Android currently doesn't support ELF TLS. It is used to
// store sanitizer thread specific data.
static const int TLS_SLOT_SANITIZER = 6;
ALWAYS_INLINE uptr *getAndroidTlsPtr() {
return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_SANITIZER]);
}
#endif // SCUDO_ANDROID
} // namespace scudo
#endif // SCUDO_LINUX
#endif // SCUDO_LINUX_H_
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