Android.mk revision e0b4844a20ffd022a568abb4203b3f7c759c7ff5
1LOCAL_PATH:= $(call my-dir) 2include $(CLEAR_VARS) 3 4LOCAL_SRC_FILES:= \ 5 arch/$(TARGET_ARCH)/begin.S \ 6 linker.c \ 7 linker_environ.c \ 8 linker_format.c \ 9 rt.c \ 10 dlfcn.c \ 11 debugger.c \ 12 ba.c 13 14ifeq ($(TARGET_ARCH),sh) 15# SH-4A series virtual address range from 0x00000000 to 0x7FFFFFFF. 16LINKER_TEXT_BASE := 0x70000100 17else 18# This is aligned to 4K page boundary so that both GNU ld and gold work. Gold 19# actually produces a correct binary with starting address 0xB0000100 but the 20# extra objcopy step to rename symbols causes the resulting binary to be misaligned 21# and unloadable. Increasing the alignment adds an extra 3840 bytes in padding 22# but switching to gold saves about 1M of space. 23LINKER_TEXT_BASE := 0xB0001000 24endif 25 26# The maximum size set aside for the linker, from 27# LINKER_TEXT_BASE rounded down to a megabyte. 28LINKER_AREA_SIZE := 0x01000000 29 30LOCAL_LDFLAGS := -Wl,-Ttext,$(LINKER_TEXT_BASE) 31 32LOCAL_CFLAGS += -DPRELINK 33LOCAL_CFLAGS += -DLINKER_TEXT_BASE=$(LINKER_TEXT_BASE) 34LOCAL_CFLAGS += -DLINKER_AREA_SIZE=$(LINKER_AREA_SIZE) 35 36# Set LINKER_DEBUG to either 1 or 0 37# 38LOCAL_CFLAGS += -DLINKER_DEBUG=0 39 40# we need to access the Bionic private header <bionic_tls.h> 41# in the linker; duplicate the HAVE_ARM_TLS_REGISTER definition 42# from the libc build 43ifeq ($(TARGET_ARCH)-$(ARCH_ARM_HAVE_TLS_REGISTER),arm-true) 44 LOCAL_CFLAGS += -DHAVE_ARM_TLS_REGISTER 45endif 46LOCAL_CFLAGS += -I$(LOCAL_PATH)/../libc/private 47 48ifeq ($(TARGET_ARCH),arm) 49LOCAL_CFLAGS += -DANDROID_ARM_LINKER 50else 51 ifeq ($(TARGET_ARCH),x86) 52 LOCAL_CFLAGS += -DANDROID_X86_LINKER 53 LOCAL_CFLAGS += -I$(LOCAL_PATH)/../libc/arch-x86/bionic 54 else 55 ifeq ($(TARGET_ARCH),sh) 56 LOCAL_CFLAGS += -DANDROID_SH_LINKER 57 else 58 $(error Unsupported TARGET_ARCH $(TARGET_ARCH)) 59 endif 60 endif 61endif 62 63LOCAL_MODULE:= linker 64 65LOCAL_STATIC_LIBRARIES := libc_nomalloc 66 67#LOCAL_FORCE_STATIC_EXECUTABLE := true # not necessary when not including BUILD_EXECUTABLE 68 69# 70# include $(BUILD_EXECUTABLE) 71# 72# Instead of including $(BUILD_EXECUTABLE), we execute the steps to create an executable by 73# hand, as we want to insert an extra step that is not supported by the build system, and 74# is probably specific the linker only, so there's no need to modify the build system for 75# the purpose. 76 77LOCAL_MODULE_CLASS := EXECUTABLES 78LOCAL_MODULE_SUFFIX := $(TARGET_EXECUTABLE_SUFFIX) 79 80# Executables are not prelinked. 81LOCAL_PRELINK_MODULE := false 82 83include $(BUILD_SYSTEM)/dynamic_binary.mk 84 85$(linked_module): $(TARGET_CRTBEGIN_STATIC_O) $(all_objects) $(all_libraries) $(TARGET_CRTEND_O) 86 $(transform-o-to-static-executable) 87 @echo "target PrefixSymbols: $(PRIVATE_MODULE) ($@)" 88 $(hide) $(TARGET_OBJCOPY) --prefix-symbols=__dl_ $@ 89 90# 91# end of BUILD_EXECUTABLE hack 92# 93 94# we don't want crtbegin.o (because we have begin.o), so unset it 95# just for this module 96$(LOCAL_BUILT_MODULE): TARGET_CRTBEGIN_STATIC_O := 97# This line is not strictly necessary because the dynamic linker is built 98# as a static executable, but it won't hurt if in the future we start 99# building the linker as a dynamic one. 100$(LOCAL_BUILT_MODULE): TARGET_CRTBEGIN_DYNAMIC_O := 101