2e85579c34
Changed it so that when the linker generates error messages, they are scribbled away into a buffer that dlfcn and friends can read from. Since the error messages are generetad with snprintf, and snprintf MAY call malloc during some code paths, we now link against a version of libc that does not contain malloc/free/realloc/calloc. We then define malloc and friends in the dynamic loader, and make them abort() if they are ever called. Signed-off-by: Dima Zavin <dima@android.com>
76 lines
2.1 KiB
Makefile
76 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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rt.c \
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dlfcn.c \
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debugger.c \
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ba.c
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LINKER_TEXT_BASE := 0xB0000100
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# The maximum size set aside for the linker, from
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# LINKER_TEXT_BASE rounded down to a megabyte.
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LINKER_AREA_SIZE := 0x01000000
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LOCAL_LDFLAGS := -Wl,-Ttext,$(LINKER_TEXT_BASE)
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LOCAL_CFLAGS += -DPRELINK
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LOCAL_CFLAGS += -DLINKER_TEXT_BASE=$(LINKER_TEXT_BASE)
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LOCAL_CFLAGS += -DLINKER_AREA_SIZE=$(LINKER_AREA_SIZE)
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# we need to access the Bionic private header <bionic_tls.h>
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# in the linker
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LOCAL_CFLAGS += -I$(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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$(error Unsupported TARGET_ARCH $(TARGET_ARCH))
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endif
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endif
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LOCAL_MODULE:= linker
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LOCAL_STATIC_LIBRARIES := libcutils 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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# Executables are not prelinked.
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LOCAL_PRELINK_MODULE := false
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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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