4da52517c1
This patch removes the component_entry_point library, which used to proved a hook for the libc to intercept the call of the 'Component::construct' function. The mechansim has several shortcomings (see the discussion in the associated issue) and was complex. So we eventually discarded the approach in favor of the explicit handling of the startup. A regular Genode component provides a 'Component::construct' function, which is determined by the dynamic linker via a symbol lookup. For the time being, the dynamic linker falls back to looking up a 'main' function if no 'Component::construct' function could be found. The libc provides an implementation of 'Component::construct', which sets up the libc's task handling and finally call the function 'Libc::Component::construct' from the context of the appllication task. This function is expected to be provided by the libc-using application. Consequently, Genode components that use the libc have to implement the 'Libc::Component::construct' function. The new 'posix' library provides an implementation of 'Libc::Component::construct' that calls a main function. Hence, POSIX programs that merely use the POSIX API merely have to add 'posix' to the 'LIBS' declaration in their 'target.mk' file. Their execution starts at 'main'. Issue #2199
45 lines
1.0 KiB
Makefile
45 lines
1.0 KiB
Makefile
SHARED_LIB = yes
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DIR = $(BASE_DIR)/src/lib/ldso
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LIB_IS_DYNAMIC_LINKER = yes
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include $(BASE_DIR)/mk/base-libs.mk
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LIBS = $(BASE_LIBS)
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SRC_CC = main.cc test.cc exception.cc dependency.cc debug.cc \
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shared_object.cc
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SRC_S = jmp_slot.s
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INC_DIR += $(DIR)/include
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INC_DIR += $(BASE_DIR)/src/include
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LD_OPT += -Bsymbolic-functions --version-script=symbol.map
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#
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# Generate symbol map from the ABI
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#
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$(LIB).lib.so: symbol.map
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symbol.map: $(MAKEFILE_LIST)
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symbol.map: $(BASE_DIR)/lib/symbols/ld
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$(MSG_CONVERT)$@
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$(VERBOSE)(echo -e "{\n\tglobal:";\
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sed -n "s/^\(\w\+\) .*/\t\t\1;/p" $<;\
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echo -e "\tlocal: *;\n};") > $@
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ifneq ($(filter linux, $(SPECS)),)
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ENTRY_POINT = _start_initial_stack
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LD_OPT += -T$(call select_from_repositories,src/ld/stack_area.nostdlib.ld) \
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ifneq ($(filter x86_32, $(SPECS)),)
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LD_OPT += -T$(DIR)/linux-32.ld
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endif
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else
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ENTRY_POINT = _start
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LD_OPT += -T$(DIR)/linker.ld
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endif
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vpath %.cc $(DIR)
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# vi:ft=make
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