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bionic/linker/Android.mk

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auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
arch/$(TARGET_ARCH)/begin.S \
linker.c \
linker: Remove unsecure env. variable for setuid programs. This removes several unsecure environment variables from the environment block when the program being loaded is setuid. The list of env. variables is the same than what GLibc uses at this point. Change-Id: I456d3ea0880fe0d4de0d3c5dd51871dd36e87fd6
2010-12-16 19:52:02 +01:00
linker_environ.c \
Fix debug output in the dynamic linker. This provides a mini-printf implementation that reduces the size of the dynamic linker by 25 KB, by preventing the drag of formatting-related routines from the C library. Also allow traces to be sent to the log, instead of stdout. NOTE: You now need to modify Android.mk to enable/disable debug output.
2010-01-20 21:36:51 +01:00
linker_format.c \
linker: New sources to manage the ELF program header table. This patch introduces two new source files containing a set of functions to manage the program header table in an ELF binary, including the ability to load PT_LOAD segments, and apply PT_GNU_RELRO protection. Note: the files are not used currently, this will appear in a series of future patches that will gradually modify linker.c to use the phdr_table_xxx functions properly. Change-Id: Ia3d4c1ff5fc3e265d8258b64b492f4e643f51bdc
2012-06-19 11:21:29 +02:00
linker_phdr.c \
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
rt.c \
dlfcn.c \
Revert "Revert "linker: get rid of the buddy allocator"" This reverts commit f9a9cda23a6afc1c2dfdfd624cde23b61941eb5e. This revert is promised once b/5039224, b/5036755, b/5036610 are resolved.
2011-07-17 21:32:43 +02:00
debugger.c
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
Make the linker relocatable. Previously, the linker always loaded itself into the same location in memory, which inhibited the effectiveness of Android's ASLR implementation. Modify the linker code so it can be relocatable and link itself at runtime. Change-Id: Ia80273d7a00ff648b4da545f4b69debee6343968
2011-11-12 00:53:17 +01:00
LOCAL_LDFLAGS := -shared
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
linker: enable -fvisibility=hidden Compile the linker with -fvisibility=hidden. This reduces the number of symbols that show up in the .dynsym section of the linker. These symbols are never exported to other applications. In particular, this fixes a problem with setting -DLINKER_DEBUG=1 introduced in 468319ce4f3f7383d788b76c09cda2a405311f36. Because the symbols "debug_verbosity" and "format_log" have not been resolved before the linker links itself, any attempt to call PRINT / INFO / TRACE / WARN / ERROR will result in a segfault. This change allows the static linker to produce a relative reference to these symbols rather than relying on relocation. This also has a nice side effect of making the linker slightly smaller and slightly more optimized. The following symbols no longer in the .dynsym section of the linker after this change: -addr_to_name -call_constructors_recursi -calloc -debugger_init -debugger_signal_handler -debug_verbosity -dladdr -dlclose -dlerror -dl_lock -dlopen -dlsym -dl_unwind_find_exidx -find_containing_library -find_containing_symbol -find_library -format_buffer -free -libdl_info -linker_env_get -linker_env_init -linker_env_secure -linker_env_unset -linker_get_error -__linker_init -lookup -lookup_in_library -malloc -notify_gdb_of_libraries -notify_gdb_of_load -notify_gdb_of_unload -realloc -rtld_db_dlactivity -unload_library -vsnprintf Bug: 5827809 Change-Id: I5e8cd7dcf48c1d6831a970a67f63f24916c5e437
2012-04-04 19:18:27 +02:00
LOCAL_CFLAGS += -fno-stack-protector \
-Wstrict-overflow=5 \
Use std=gnu99 for the dynamic linker as well as libc. Change-Id: I76dd78576c5af6eb6282555f069647b6260edc31
2012-07-16 18:43:14 +02:00
-fvisibility=hidden \
MIPS support to the linker Change-Id: I37ec2d6c51d82bb9e9dbfef4b38c85366bead255 Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Raghu Gandham <raghu@mips.com> Signed-off-by: Bhanu Chetlapalli <bhanu@mips.com>
2012-07-31 21:07:22 +02:00
-std=gnu99 \
-Wall -Wextra
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
Fix debug output in the dynamic linker. This provides a mini-printf implementation that reduces the size of the dynamic linker by 25 KB, by preventing the drag of formatting-related routines from the C library. Also allow traces to be sent to the log, instead of stdout. NOTE: You now need to modify Android.mk to enable/disable debug output.
2010-01-20 21:36:51 +01:00
# Set LINKER_DEBUG to either 1 or 0
#
LOCAL_CFLAGS += -DLINKER_DEBUG=0
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
# we need to access the Bionic private header <bionic_tls.h>
Use correct TLS codepath for linker Replicate ARM libc build's HAVE_ARM_TLS_REGISTER preprocessor definition logic, to ensure that the runtime linker uses the correct codepath for accessing the TLS address
2009-09-30 01:12:31 +02:00
# in the linker; duplicate the HAVE_ARM_TLS_REGISTER definition
# from the libc build
ifeq ($(TARGET_ARCH)-$(ARCH_ARM_HAVE_TLS_REGISTER),arm-true)
LOCAL_CFLAGS += -DHAVE_ARM_TLS_REGISTER
endif
Define __stack_chk_fail_local.S With -fstack-protector, x86 -m32 needs __stack_chk_fail_local defined in crtbegin_*.o. Include __stack_chk_fail_local.S in begin.S otherwise linker (which is built w/o crt*) may not link. Change-Id: Id242fcf3eff157264afe3b04f27288ab7991220a
2012-06-20 08:35:51 +02:00
LOCAL_CFLAGS += \
-I$(LOCAL_PATH)/../libc/private \
-I$(LOCAL_PATH)/../libc/arch-$(TARGET_ARCH)/bionic
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
ifeq ($(TARGET_ARCH),arm)
MIPS support to the linker Change-Id: I37ec2d6c51d82bb9e9dbfef4b38c85366bead255 Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Raghu Gandham <raghu@mips.com> Signed-off-by: Bhanu Chetlapalli <bhanu@mips.com>
2012-07-31 21:07:22 +02:00
LOCAL_CFLAGS += -DANDROID_ARM_LINKER
endif
ifeq ($(TARGET_ARCH),x86)
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
LOCAL_CFLAGS += -DANDROID_X86_LINKER
MIPS support to the linker Change-Id: I37ec2d6c51d82bb9e9dbfef4b38c85366bead255 Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Raghu Gandham <raghu@mips.com> Signed-off-by: Bhanu Chetlapalli <bhanu@mips.com>
2012-07-31 21:07:22 +02:00
endif
ifeq ($(TARGET_ARCH),mips)
LOCAL_CFLAGS += -DANDROID_MIPS_LINKER
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
endif
LOCAL_MODULE:= linker
linker: remove libcutils dependency by re-implementing simpler socket_local_client. Change-Id: I87f29fd59454d713b9ddfb13e6cf114822f52efd
2010-06-11 03:29:33 +02:00
LOCAL_STATIC_LIBRARIES := libc_nomalloc
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
#LOCAL_FORCE_STATIC_EXECUTABLE := true # not necessary when not including BUILD_EXECUTABLE
#
# include $(BUILD_EXECUTABLE)
#
# Instead of including $(BUILD_EXECUTABLE), we execute the steps to create an executable by
# hand, as we want to insert an extra step that is not supported by the build system, and
# is probably specific the linker only, so there's no need to modify the build system for
# the purpose.
LOCAL_MODULE_CLASS := EXECUTABLES
LOCAL_MODULE_SUFFIX := $(TARGET_EXECUTABLE_SUFFIX)
linker: set LOCAL_NO_CRT := true Use LOCAL_NO_CRT to prevent linking against crtbegin.o, rather than messing with build rules. This also prevents linking against crtend.o, which isn't needed for the linker. Change-Id: I0c5b9999be7e8676560fe145c1c033ffce8db4d1
2011-11-04 18:11:26 +01:00
# we don't want crtbegin.o (because we have begin.o), so unset it
# just for this module
LOCAL_NO_CRT := true
auto import from //depot/cupcake/@135843
2009-03-04 04:28:35 +01:00
include $(BUILD_SYSTEM)/dynamic_binary.mk
$(linked_module): $(TARGET_CRTBEGIN_STATIC_O) $(all_objects) $(all_libraries) $(TARGET_CRTEND_O)
$(transform-o-to-static-executable)
@echo "target PrefixSymbols: $(PRIVATE_MODULE) ($@)"
$(hide) $(TARGET_OBJCOPY) --prefix-symbols=__dl_ $@
#
# end of BUILD_EXECUTABLE hack
#
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