generic-library/bionic
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Add functions to provide target sdk version

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Bug: http://b/21364029
Change-Id: I8648d1bff6c8fd6e7cd12da7f128e048b9f2829a
This commit is contained in:
Dmitriy Ivanov 2015-05-21 17:43:49 -07:00
parent aaafbe128f
commit 79fd668bb4
9 changed files with 138 additions and 15 deletions
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2
libdl/Android.mk
View File

@ -15,7 +15,7 @@ include $(CLEAR_VARS)
#
# DO NOT REMOVE --exclude-libs!
LOCAL_LDFLAGS := -Wl,--exclude-libs=libgcc.a
LOCAL_LDFLAGS := -Wl,--exclude-libs=libgcc.a -Wl,--version-script=$(LOCAL_PATH)/libdl.map
# for x86, exclude libgcc_eh.a for the same reasons as above
LOCAL_LDFLAGS_x86 := -Wl,--exclude-libs=libgcc_eh.a

4
libdl/libdl.c
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@ -17,6 +17,7 @@
#include <dlfcn.h>
#include <link.h>
#include <stdlib.h>
#include <stdbool.h>
#include <android/dlext.h>
// These are stubs for functions that are actually defined
@ -38,3 +39,6 @@ void android_get_LD_LIBRARY_PATH(char* buffer __unused, size_t buffer_size __unu
void android_update_LD_LIBRARY_PATH(const char* ld_library_path __unused) { }
void* android_dlopen_ext(const char* filename __unused, int flag __unused, const android_dlextinfo* extinfo __unused) { return 0; }
void android_set_application_target_sdk_version(uint32_t target __unused) { }
uint32_t android_get_application_target_sdk_version() { return 0; }

39
libdl/libdl.map Normal file
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@ -0,0 +1,39 @@
#
# Copyright (C) 2015 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
LIBC {
global:
android_dlopen_ext;
dl_iterate_phdr;
# begin arm-only
dl_unwind_find_exidx;
# end arm-only
dladdr;
dlclose;
dlerror;
dlopen;
dlsym;
local:
*;
};
LIBC_PRIVATE {
global:
android_get_application_target_sdk_version;
android_set_application_target_sdk_version;
android_get_LD_LIBRARY_PATH;
android_update_LD_LIBRARY_PATH;
} LIBC;

1
linker/Android.mk
View File

@ -7,6 +7,7 @@ LOCAL_SRC_FILES:= \
dlfcn.cpp \
linker.cpp \
linker_allocator.cpp \
linker_sdk_versions.cpp \
linker_block_allocator.cpp \
linker_environ.cpp \
linker_libc_support.c \

40
linker/dlfcn.cpp
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@ -157,6 +157,14 @@ int dlclose(void* handle) {
return 0;
}
void android_set_application_target_sdk_version(uint32_t target) {
set_application_target_sdk_version(target);
}
uint32_t android_get_application_target_sdk_version() {
return get_application_target_sdk_version();
}
// name_offset: starting index of the name in libdl_info.strtab
#define ELF32_SYM_INITIALIZER(name_offset, value, shndx) \
{ name_offset, \
@ -176,19 +184,21 @@ int dlclose(void* handle) {
/* st_size */ 0, \
}
static const char ANDROID_LIBDL_STRTAB[] =
// 0000000 00011111 111112 22222222 2333333 3333444444444455555555556666666 6667777777777888888888899999 99999
// 0123456 78901234 567890 12345678 9012345 6789012345678901234567890123456 7890123456789012345678901234 56789
"dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0android_update_LD_LIBRARY_PATH\0android_get_LD_LIBRARY_PATH\0dl_it"
// 00000000001 1111111112222222222 3333333333444444444455555555556666666666777 777777788888888889999999999
// 01234567890 1234567890123456789 0123456789012345678901234567890123456789012 345678901234567890123456789
"erate_phdr\0android_dlopen_ext\0android_set_application_target_sdk_version\0android_get_application_tar"
// 0000000000111111
// 0123456789012345
"get_sdk_version\0"
#if defined(__arm__)
// 0000000 00011111 111112 22222222 2333333 3333444444444455555555556666666 6667777777777888888888899999 9999900000000001 1111111112222222222 333333333344444444445
// 0123456 78901234 567890 12345678 9012345 6789012345678901234567890123456 7890123456789012345678901234 5678901234567890 1234567890123456789 012345678901234567890
# define ANDROID_LIBDL_STRTAB \
"dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0android_update_LD_LIBRARY_PATH\0android_get_LD_LIBRARY_PATH\0dl_iterate_phdr\0android_dlopen_ext\0dl_unwind_find_exidx\0"
#elif defined(__aarch64__) || defined(__i386__) || defined(__mips__) || defined(__x86_64__)
// 0000000 00011111 111112 22222222 2333333 3333444444444455555555556666666 6667777777777888888888899999 9999900000000001 1111111112222222222
// 0123456 78901234 567890 12345678 9012345 6789012345678901234567890123456 7890123456789012345678901234 5678901234567890 1234567890123456789
# define ANDROID_LIBDL_STRTAB \
"dlopen\0dlclose\0dlsym\0dlerror\0dladdr\0android_update_LD_LIBRARY_PATH\0android_get_LD_LIBRARY_PATH\0dl_iterate_phdr\0android_dlopen_ext\0"
#else
# error Unsupported architecture. Only arm, arm64, mips, mips64, x86 and x86_64 are presently supported.
// 216
"dl_unwind_find_exidx\0"
#endif
;
static ElfW(Sym) g_libdl_symtab[] = {
// Total length of libdl_info.strtab, including trailing 0.
@ -205,8 +215,10 @@ static ElfW(Sym) g_libdl_symtab[] = {
ELFW(SYM_INITIALIZER)( 67, &android_get_LD_LIBRARY_PATH, 1),
ELFW(SYM_INITIALIZER)( 95, &dl_iterate_phdr, 1),
ELFW(SYM_INITIALIZER)(111, &android_dlopen_ext, 1),
ELFW(SYM_INITIALIZER)(130, &android_set_application_target_sdk_version, 1),
ELFW(SYM_INITIALIZER)(173, &android_get_application_target_sdk_version, 1),
#if defined(__arm__)
ELFW(SYM_INITIALIZER)(130, &dl_unwind_find_exidx, 1),
ELFW(SYM_INITIALIZER)(216, &dl_unwind_find_exidx, 1),
#endif
};
@ -223,9 +235,9 @@ static ElfW(Sym) g_libdl_symtab[] = {
// Note that adding any new symbols here requires stubbing them out in libdl.
static unsigned g_libdl_buckets[1] = { 1 };
#if defined(__arm__)
static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0 };
static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 0 };
#else
static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
static unsigned g_libdl_chains[] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0 };
#endif
static uint8_t __libdl_info_buf[sizeof(soinfo)] __attribute__((aligned(8)));

3
linker/linker.h
View File

@ -429,4 +429,7 @@ extern "C" void notify_gdb_of_libraries();
char* linker_get_error_buffer();
size_t linker_get_error_buffer_size();
void set_application_target_sdk_version(uint32_t target);
uint32_t get_application_target_sdk_version();
#endif

29
linker/linker_sdk_versions.cpp Normal file
View File

@ -0,0 +1,29 @@
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "linker.h"
#include <atomic>
static std::atomic<uint32_t> g_target_sdk_version;
void set_application_target_sdk_version(uint32_t target) {
g_target_sdk_version = target;
}
uint32_t get_application_target_sdk_version() {
return g_target_sdk_version;
}

3
tests/Android.mk
View File

@ -49,6 +49,9 @@ endif
test_cppflags = \
-std=gnu++11 \
libBionicStandardTests_src_files_target := \
libdl_test.cpp \
libBionicStandardTests_src_files := \
arpa_inet_test.cpp \
buffer_tests.cpp \

32
tests/libdl_test.cpp Normal file
View File

@ -0,0 +1,32 @@
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
extern "C" uint32_t android_get_application_target_sdk_version();
extern "C" void android_set_application_target_sdk_version(uint32_t target);
TEST(libdl, application_sdk_versions_smoke) {
// Check initial values
ASSERT_EQ(0U, android_get_application_target_sdk_version());
android_set_application_target_sdk_version(20U);
ASSERT_EQ(20U, android_get_application_target_sdk_version());
android_set_application_target_sdk_version(22U);
ASSERT_EQ(22U, android_get_application_target_sdk_version());
}