The linux kernel requires that the ELF interpreter (runtime linker)
that's referenced by PT_INTERP be either an absolute path, or a relative
path from the current working directory. We'd prefer a relative path
from the binary, similarly to how we handle looking up shared libraries,
but that's not supported.
Instead, extract the LOAD segments from the runtime linker ELF binary
and embed them into each host bionic binary, omitting the PT_INTERP
declaration. The kernel will treat it as a static binary, and we'll use
a special entry point (linker_wrapper) to fix up the arguments passed by
the kernel before jumping to the embedded linker. From the linker's
point of view, it looks like the kernel loaded the linker like normal.
Bug: 31559095
Test: Enable host bionic, build and run libdemangle_test
Change-Id: I1753401ef91eecbf0ae3376faca31eec1c53842b
Don't link to it when building with bionic for the host.
Also add libasync_safe, which is used by linker_globals.h even when
debuggerd isn't used.
Bug: 31559095
Test: mma
Test: Attempt to build host bionic
Change-Id: I374e2c2c288133875da82de780b27917ca524240
This change also replaces elf-hash with gnu-hash.
Test: make
Test: bionic-unit-tests --gtest_filter=dl*:Dl*
Change-Id: Ibc4026f7abc7e8002f69c33eebaf6a193f1d22eb
Leaving these unimplemented causes linker to have 2 weak undefined
symbols which in turn results in 3 unwanted relocations for arm arch.
Implementing them removes unwanted relocations from resulted dynamic
object
Test: make && readelf --dyn-sym linker
Test: linker-unit-tests && bionic-unit-tests --gtest_filter=dl*:Dl*
Test: flash and boot angler
Change-Id: I10120271936c770659239898aaf852d31c5483c2
With ld.config.txt, we now have multiple built-in namespaces other than
the default namespace. Libs (and their dependents) listed in LD_PRELOAD
must be visible to those additional namespaces as well.
This also adds a debugging only feature: path to the linker config file
can be customized via LD_CONFIG_FILE environment variable. This works
only for debuggable builds.
Bug: 38114603
Bug: 62815515
Test: 1. ./external/compiler-rt/lib/asan/scripts/asan_device_setup --lib
prebuilts/clang/host/linux-x86/clang-stable/lib64/clang/5.0/lib/linux
2. enable talkback shortcut
3. in the home screen, hold vol-up/down together
4. device does not reboots and talkback shortcut is toggled
Test: bionic-unit-tests and linker-unit-tests successful
Change-Id: I9a03591053f4a9caea82f0dcb23e7a3d324bb9bd
This library is used by a number of different libraries in the system.
Make it easy for platform libraries to use this library and create
an actual exported include file.
Change the names of the functions to reflect the new name of the library.
Run clang_format on the async_safe_log.cpp file since the formatting is
all over the place.
Bug: 31919199
Test: Compiled for angler/bullhead, and booted.
Test: Ran bionic unit tests.
Test: Ran the malloc debug tests.
Change-Id: I8071bf690c17b0ea3bc8dc5749cdd5b6ad58478a
This change allows customization of default namespace
configuration for different executables. It also enables
target_sdk_version setup for binaries (note that this
option should explicitly be enabled in ld.config.txt).
Bug: http://b/30706810
Bug: http://b/30435785
Test: run linker-unit-tests/bionic-unit-tests, boot angler
Change-Id: Ibbe87209acf1538fc9cec04944f3d22a190c38f1
android loader should not rely on the fact
that AT_BASE is set because kernel currently
does not set it when linker is run standalone
(The linker does not have PT_INTERP set)
This commit replaces AT_BASE with calculated value.
Bug: http://b/30739481
Bug: http://b/35890756
Test: run bionic-unit-tests --gtest_filter=dl*
Change-Id: Ic2eb73e4452624b1f2e05f46e99e4c17df0bbc3f
Remove dependencies that are now linked directly into
libdebuggerd_handler_fallback via whole_static_libraries.
Test: m
Change-Id: I00e2edb2778c2986c533f97708252aa0996d0498
Some versions of kernel set AT_BASE to 0
if dynamic loader does not have PT_INTERP
set.
Bug: http://b/30739481
Test: run /system/bin/linker64 and /system/bin/linker
Change-Id: I1b67777166fe917d3ee1a97277045ca6f5db0084
Provide stub for unused but needed symbol __find_icu_symbol
which is not included to libc_nomalloc.a.
Test: mm and boot
Change-Id: I57ca09c990556d1d401e2f4a75bc49b61b4cd85d
Do not hijack libdl.so methods but make libdl proxy calls to
loader instead. This will be replaces by calls to libc.so
once loader functionality is migrated.
Also add a lock to dl_unwind_find_exidx function call.
Test: bionic-unit-tests --gtest_filter=dl*:Dl*
Bug: http://b/27106625
Change-Id: Ic33a7109a86f4262798d63a35f4c61d15b0068bb
Soong now appends the suffix to the symlink, so the multilib-specific
symlink is no longer necessary.
Test: m -j out/target/product/angler/system/bin/linker_asan64
Test: Examine LOCAL_MODULE_SYMLINKS in out/soong/Android-aosp_angler.mk
Change-Id: I913a318bb31de3e630eebd2d68041a55ce3eccaf
This is to prevent situations when libgcc.a calls into incorrect
implementation of dl_iterate_phdr.
Bug: http://b/27106625
Test: build && run bionic-unit-tests --getst_filter=dl*:Dl*
Change-Id: I4cba8c4a156f91f17ba3d95c39cb80f9b70c9d8f
Do not hijack libdl.so methods but make libdl proxy calls to
loader instead. This will be replaces by calls to libc.so
once loader functionality is migrated.
Also add a lock to dl_unwind_find_exidx function call.
Test: bionic-unit-tests --gtest_filter=dl*:Dl*
Bug: http://b/27106625
Change-Id: I9e666e771e4bbca52151cfa7fc4c8677e1480818
Disables debuggerd integration unless building for android.
Bug: 31559095
Test: Diff out/soong/build.ninja before/after, only change is moving
linker's libdebuggerd_client static lib to the beginning of the
list.
Test: lunch aosp_arm64-eng; mmma -j bionic
Change-Id: I62e725f7a9b98b7fe31637d0a835fd5846b0aff0
Extract linker executable specific code to linker_main.cpp;
this part of code does not have a place in libdl.a/so.
Bug: http://b/14998480
Bug: http://b/30706810
Test: mm && run bionic-unit-tests
Change-Id: I90f7475e93a919b0f9525da22928089ad35b8f6c
Move soinfo and globals out of linker.cpp to
separate files.
Breaking up huge linker.cpp into smaller peaces
in order to make it easier to extract part of the
code that belongs to libdl.so and remove parts of
the code that do not belong to linker
(refactoring part 2 of many)
Change-Id: I868417f4b8d2b84d0e8265e354bc7977161497e2
Breaking up huge linker.cpp into smaller peaces
in order to make it easier to extract part of the
code that belongs to libdl.so and remove parts of
the code that do not belong to linker
(refactoring part 1 of many)
Change-Id: I57ac36677a815800dc127c8c45c3ea806c37e247
Test: bionic-unit-tests --gtest_filter=dl*:Dl*
This change includes dlwarning implementation and
the compatibility greylist for apps targeting pre-N.
Change-Id: Ibf02a07cc58cbbb1a5aef4ac34558c5d43e4305f
Test: Run bionic-unit-tests --gtest_filter=dl*:Dl*
