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