994e9a5ed1
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: I90d064743abdd29450ac0482ed28752b2196286c
79 lines
2.1 KiB
Makefile
79 lines
2.1 KiB
Makefile
LOCAL_PATH:= $(call my-dir)
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include $(CLEAR_VARS)
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LOCAL_SRC_FILES:= \
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arch/$(TARGET_ARCH)/begin.S \
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linker.c \
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linker_environ.c \
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linker_format.c \
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rt.c \
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dlfcn.c \
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debugger.c
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LOCAL_LDFLAGS := -shared
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LOCAL_CFLAGS += -fno-stack-protector
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# Set LINKER_DEBUG to either 1 or 0
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#
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LOCAL_CFLAGS += -DLINKER_DEBUG=0
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# we need to access the Bionic private header <bionic_tls.h>
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# in the linker; duplicate the HAVE_ARM_TLS_REGISTER definition
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# from the libc build
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ifeq ($(TARGET_ARCH)-$(ARCH_ARM_HAVE_TLS_REGISTER),arm-true)
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LOCAL_CFLAGS += -DHAVE_ARM_TLS_REGISTER
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endif
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LOCAL_CFLAGS += -I$(LOCAL_PATH)/../libc/private
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ifeq ($(TARGET_ARCH),arm)
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LOCAL_CFLAGS += -DANDROID_ARM_LINKER
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else
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ifeq ($(TARGET_ARCH),x86)
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LOCAL_CFLAGS += -DANDROID_X86_LINKER
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else
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ifeq ($(TARGET_ARCH),sh)
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LOCAL_CFLAGS += -DANDROID_SH_LINKER
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else
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$(error Unsupported TARGET_ARCH $(TARGET_ARCH))
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endif
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endif
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endif
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LOCAL_MODULE:= linker
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LOCAL_STATIC_LIBRARIES := libc_nomalloc
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#LOCAL_FORCE_STATIC_EXECUTABLE := true # not necessary when not including BUILD_EXECUTABLE
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#
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# include $(BUILD_EXECUTABLE)
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#
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# Instead of including $(BUILD_EXECUTABLE), we execute the steps to create an executable by
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# hand, as we want to insert an extra step that is not supported by the build system, and
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# is probably specific the linker only, so there's no need to modify the build system for
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# the purpose.
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LOCAL_MODULE_CLASS := EXECUTABLES
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LOCAL_MODULE_SUFFIX := $(TARGET_EXECUTABLE_SUFFIX)
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include $(BUILD_SYSTEM)/dynamic_binary.mk
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$(linked_module): $(TARGET_CRTBEGIN_STATIC_O) $(all_objects) $(all_libraries) $(TARGET_CRTEND_O)
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$(transform-o-to-static-executable)
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@echo "target PrefixSymbols: $(PRIVATE_MODULE) ($@)"
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$(hide) $(TARGET_OBJCOPY) --prefix-symbols=__dl_ $@
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#
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# end of BUILD_EXECUTABLE hack
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#
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# we don't want crtbegin.o (because we have begin.o), so unset it
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# just for this module
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$(LOCAL_BUILT_MODULE): TARGET_CRTBEGIN_STATIC_O :=
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# This line is not strictly necessary because the dynamic linker is built
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# as a static executable, but it won't hurt if in the future we start
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# building the linker as a dynamic one.
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$(LOCAL_BUILT_MODULE): TARGET_CRTBEGIN_DYNAMIC_O :=
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