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4634a480e0
Currently, only Android supports using a hard-code page size. Make this a bit more generic so any platform that wants to can use this. In addition, add a getPageSizeLogCached() function since this value is used in release.h and can avoid keeping this value around in objects. Finally, change some of the release.h page size multiplies to shifts using the new page size log value.
100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
//===-- platform.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_PLATFORM_H_
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#define SCUDO_PLATFORM_H_
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// Transitive includes of stdint.h specify some of the defines checked below.
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#include <stdint.h>
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#if defined(__linux__) && !defined(__TRUSTY__)
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#define SCUDO_LINUX 1
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#else
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#define SCUDO_LINUX 0
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#endif
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// See https://android.googlesource.com/platform/bionic/+/master/docs/defines.md
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#if defined(__BIONIC__)
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#define SCUDO_ANDROID 1
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// Transitive includes of unistd.h will get PAGE_SIZE if it is defined.
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#include <unistd.h>
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#if defined(PAGE_SIZE)
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#define SCUDO_PAGE_SIZE PAGE_SIZE
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#endif
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#else
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#define SCUDO_ANDROID 0
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#endif
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#if defined(__Fuchsia__)
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#define SCUDO_FUCHSIA 1
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#else
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#define SCUDO_FUCHSIA 0
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#endif
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#if defined(__TRUSTY__)
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#define SCUDO_TRUSTY 1
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#else
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#define SCUDO_TRUSTY 0
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#endif
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#if defined(__riscv) && (__riscv_xlen == 64)
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#define SCUDO_RISCV64 1
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#else
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#define SCUDO_RISCV64 0
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#endif
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#if defined(__LP64__)
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#define SCUDO_WORDSIZE 64U
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#else
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#define SCUDO_WORDSIZE 32U
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#endif
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#if SCUDO_WORDSIZE == 64U
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#define FIRST_32_SECOND_64(a, b) (b)
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#else
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#define FIRST_32_SECOND_64(a, b) (a)
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#endif
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#ifndef SCUDO_CAN_USE_PRIMARY64
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#define SCUDO_CAN_USE_PRIMARY64 (SCUDO_WORDSIZE == 64U)
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#endif
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#ifndef SCUDO_CAN_USE_MTE
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#define SCUDO_CAN_USE_MTE (SCUDO_LINUX || SCUDO_TRUSTY)
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#endif
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#ifndef SCUDO_ENABLE_HOOKS
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#define SCUDO_ENABLE_HOOKS 0
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#endif
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#ifndef SCUDO_MIN_ALIGNMENT_LOG
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// We force malloc-type functions to be aligned to std::max_align_t, but there
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// is no reason why the minimum alignment for all other functions can't be 8
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// bytes. Except obviously for applications making incorrect assumptions.
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// TODO(kostyak): define SCUDO_MIN_ALIGNMENT_LOG 3
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#define SCUDO_MIN_ALIGNMENT_LOG FIRST_32_SECOND_64(3, 4)
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#endif
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#if defined(__aarch64__)
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#define SCUDO_MMAP_RANGE_SIZE FIRST_32_SECOND_64(1ULL << 32, 1ULL << 48)
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#else
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#define SCUDO_MMAP_RANGE_SIZE FIRST_32_SECOND_64(1ULL << 32, 1ULL << 47)
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#endif
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// Older gcc have issues aligning to a constexpr, and require an integer.
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// See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56859 among others.
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#if defined(__powerpc__) || defined(__powerpc64__)
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#define SCUDO_CACHE_LINE_SIZE 128
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#else
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#define SCUDO_CACHE_LINE_SIZE 64
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#endif
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#define SCUDO_POINTER_FORMAT_LENGTH FIRST_32_SECOND_64(8, 12)
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#endif // SCUDO_PLATFORM_H_
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