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78 lines
3.0 KiB
C
78 lines
3.0 KiB
C
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// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Definitions for android_dlopen_ext().
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//
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// This function was added for Android L-MR1 and made available in android-21
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// but we currently build Chromium with android-16. Placing the declarations
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// we need here allows code that uses android_dlopen_ext() to build with
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// android-16. At runtime we check the target's SDK_INT to ensure that we
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// are on a system new enough to offer this function, and also only access
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// it with dlsym so that the runtime linker on pre-Android L-MR1 targets will
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// not complain about a missing symbol when loading our library.
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//
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// Details below taken from:
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// third_party/android_tools/ndk/platforms/android-21
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// /arch-arm/usr/include/android/dlext.h
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//
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// Although taken specifically from arch-arm, there are no architecture-
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// specific elements in dlext.h. All android-21/arch-* directories contain
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// identical copies of dlext.h.
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#ifndef BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
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#define BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
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#include <stddef.h>
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#include <stdint.h>
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/* bitfield definitions for android_dlextinfo.flags */
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enum {
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/* When set, the reserved_addr and reserved_size fields must point to an
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* already-reserved region of address space which will be used to load the
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* library if it fits. If the reserved region is not large enough, the load
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* will fail.
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*/
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ANDROID_DLEXT_RESERVED_ADDRESS = 0x1,
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/* As DLEXT_RESERVED_ADDRESS, but if the reserved region is not large enough,
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* the linker will choose an available address instead.
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*/
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ANDROID_DLEXT_RESERVED_ADDRESS_HINT = 0x2,
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/* When set, write the GNU RELRO section of the mapped library to relro_fd
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* after relocation has been performed, to allow it to be reused by another
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* process loading the same library at the same address. This implies
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* ANDROID_DLEXT_USE_RELRO.
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*/
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ANDROID_DLEXT_WRITE_RELRO = 0x4,
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/* When set, compare the GNU RELRO section of the mapped library to relro_fd
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* after relocation has been performed, and replace any relocated pages that
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* are identical with a version mapped from the file.
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*/
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ANDROID_DLEXT_USE_RELRO = 0x8,
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/* Instruct dlopen to use library_fd instead of opening file by name.
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* The filename parameter is still used to identify the library.
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*/
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ANDROID_DLEXT_USE_LIBRARY_FD = 0x10,
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/* Mask of valid bits */
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ANDROID_DLEXT_VALID_FLAG_BITS = ANDROID_DLEXT_RESERVED_ADDRESS |
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ANDROID_DLEXT_RESERVED_ADDRESS_HINT |
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ANDROID_DLEXT_WRITE_RELRO |
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ANDROID_DLEXT_USE_RELRO |
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ANDROID_DLEXT_USE_LIBRARY_FD,
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};
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typedef struct {
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uint64_t flags;
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void* reserved_addr;
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size_t reserved_size;
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int relro_fd;
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int library_fd;
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} android_dlextinfo;
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#endif // BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
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