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Unified Diff: android/linker/android_dlext.h

Issue 2043183002: Update to Chromium //base at Chromium commit 01cb97b2e09618bbc3a60c7348f0a844eea20547. (Closed) Base URL: https://github.com/domokit/base.git@master
Patch Set: Created 4 years, 6 months ago
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Index: android/linker/android_dlext.h
diff --git a/android/linker/android_dlext.h b/android/linker/android_dlext.h
new file mode 100644
index 0000000000000000000000000000000000000000..4900f21c60dbbb19f4f15b992d36d27412130818
--- /dev/null
+++ b/android/linker/android_dlext.h
@@ -0,0 +1,77 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Definitions for android_dlopen_ext().
+//
+// This function was added for Android L-MR1 and made available in android-21
+// but we currently build Chromium with android-16. Placing the declarations
+// we need here allows code that uses android_dlopen_ext() to build with
+// android-16. At runtime we check the target's SDK_INT to ensure that we
+// are on a system new enough to offer this function, and also only access
+// it with dlsym so that the runtime linker on pre-Android L-MR1 targets will
+// not complain about a missing symbol when loading our library.
+//
+// Details below taken from:
+// third_party/android_tools/ndk/platforms/android-21
+// /arch-arm/usr/include/android/dlext.h
+//
+// Although taken specifically from arch-arm, there are no architecture-
+// specific elements in dlext.h. All android-21/arch-* directories contain
+// identical copies of dlext.h.
+
+#ifndef BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
+#define BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* bitfield definitions for android_dlextinfo.flags */
+enum {
+ /* When set, the reserved_addr and reserved_size fields must point to an
+ * already-reserved region of address space which will be used to load the
+ * library if it fits. If the reserved region is not large enough, the load
+ * will fail.
+ */
+ ANDROID_DLEXT_RESERVED_ADDRESS = 0x1,
+
+ /* As DLEXT_RESERVED_ADDRESS, but if the reserved region is not large enough,
+ * the linker will choose an available address instead.
+ */
+ ANDROID_DLEXT_RESERVED_ADDRESS_HINT = 0x2,
+
+ /* When set, write the GNU RELRO section of the mapped library to relro_fd
+ * after relocation has been performed, to allow it to be reused by another
+ * process loading the same library at the same address. This implies
+ * ANDROID_DLEXT_USE_RELRO.
+ */
+ ANDROID_DLEXT_WRITE_RELRO = 0x4,
+
+ /* When set, compare the GNU RELRO section of the mapped library to relro_fd
+ * after relocation has been performed, and replace any relocated pages that
+ * are identical with a version mapped from the file.
+ */
+ ANDROID_DLEXT_USE_RELRO = 0x8,
+
+ /* Instruct dlopen to use library_fd instead of opening file by name.
+ * The filename parameter is still used to identify the library.
+ */
+ ANDROID_DLEXT_USE_LIBRARY_FD = 0x10,
+
+ /* Mask of valid bits */
+ ANDROID_DLEXT_VALID_FLAG_BITS = ANDROID_DLEXT_RESERVED_ADDRESS |
+ ANDROID_DLEXT_RESERVED_ADDRESS_HINT |
+ ANDROID_DLEXT_WRITE_RELRO |
+ ANDROID_DLEXT_USE_RELRO |
+ ANDROID_DLEXT_USE_LIBRARY_FD,
+};
+
+typedef struct {
+ uint64_t flags;
+ void* reserved_addr;
+ size_t reserved_size;
+ int relro_fd;
+ int library_fd;
+} android_dlextinfo;
+
+#endif // BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
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