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2f9d430c00
This patch adds support for running Genode/Linux on the AARCH64 architecture. - The kernel-agnostic startup code (crt0) had to be extended to capture the initial stack pointer, which the Linux kernel uses to pass the process environment. This is in line with the existing startup code for x86_32 and x86_64. - The link order of the host libraries linked to lx_hybrid programs had to be adjusted such that libgcc appears at last because the other libraries depend on symbols provided by libgcc. - When using AARCH64 Linux as host, one can execute run scripts via 'make run/<script> KERNEL=linux BOARD=linux' now. Issue #4136
127 lines
4.1 KiB
Makefile
127 lines
4.1 KiB
Makefile
#
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# Make Linux headers of the host platform available to the program
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#
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include $(call select_from_repositories,lib/import/import-syscall-linux.mk)
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#
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# Manually supply all library search paths of the host compiler to our tool
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# chain.
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#
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HOST_LIB_SEARCH_DIRS = $(shell $(CUSTOM_HOST_CC) $(CC_MARCH) -print-search-dirs | grep libraries |\
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sed "s/.*=//" | sed "s/:/ /g" |\
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sed "s/\/ / /g" | sed "s/\/\$$//")
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#
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# Add search path for 'limits.h'
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#
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# We cannot simply extend 'INC_DIR' because this would give precedence to the
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# host include search paths over Genode search path. The variable HOST_INC_DIR
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# is appended to the include directory list.
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#
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HOST_INC_DIR += $(shell echo "int main() {return 0;}" |\
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LANG=C $(CXX) -x c++ -v -E - 2>&1 |\
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sed '/^\#include <\.\.\.> search starts here:/,/^End of search list/!d' |\
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grep "include-fixed")
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#
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# Add search paths for normal libraries
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#
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CXX_LINK_OPT += $(addprefix -L,$(HOST_LIB_SEARCH_DIRS))
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#
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# Determine ldconfig executable
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#
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# On Ubuntu, /sbin/ is in the PATH variable. Hence we try using the program
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# found via 'which'. If 'which' does not return anything (i.e., on Debian),
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# try using the expected location '/sbin/'.
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#
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LDCONFIG := $(firstword $(wildcard $(shell which ldconfig) /sbin/ldconfig))
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ifeq ($(LDCONFIG),)
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$(error ldconfig is not found)
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endif
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#
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# Add search paths for shared-library lookup
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#
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# We add all locations of shared libraries present in the ld.cache to our
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# library search path.
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#
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HOST_SO_SEARCH_DIRS := $(sort $(dir $(shell $(LDCONFIG) -p | sed "s/^.* \//\//" | grep "^\/")))
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LINK_ARG_PREFIX := -Wl,
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CXX_LINK_OPT += $(addprefix $(LINK_ARG_PREFIX)-rpath-link $(LINK_ARG_PREFIX),$(HOST_SO_SEARCH_DIRS))
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#
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# Make exceptions work
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#
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CXX_LINK_OPT += -Wl,--eh-frame-hdr
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#
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# Add all libraries and their dependencies specified at the 'LX_LIBS'
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# variable to the linker command line
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#
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ifneq ($(LX_LIBS),)
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LX_LIBS_OPT = $(shell pkg-config --static --libs $(LX_LIBS))
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endif
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#
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# Use the host's startup codes, linker script, and dynamic linker
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#
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LD_TEXT_ADDR ?=
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LD_SCRIPT_STATIC ?=
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EXT_OBJECTS += $(shell $(CUSTOM_HOST_CC) $(CC_MARCH) -print-file-name=crt1.o)
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EXT_OBJECTS += $(shell $(CUSTOM_HOST_CC) $(CC_MARCH) -print-file-name=crti.o)
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EXT_OBJECTS += $(shell $(CUSTOM_CC) $(CC_MARCH) -print-file-name=crtbegin.o)
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EXT_OBJECTS += $(shell $(CUSTOM_CC) $(CC_MARCH) -print-file-name=crtend.o)
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EXT_OBJECTS += $(shell $(CUSTOM_HOST_CC) $(CC_MARCH) -print-file-name=crtn.o)
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LX_LIBS_OPT += -lgcc_s -lsupc++ -lc -lpthread -lgcc
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USE_HOST_LD_SCRIPT = yes
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#
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# We need to manually add the default linker script on the command line in case
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# of standard library use. Otherwise, we were not able to extend it by the
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# stack area section.
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#
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ifeq (x86_64,$(findstring x86_64,$(SPECS)))
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CXX_LINK_OPT += -Wl,--dynamic-linker=/lib64/ld-linux-x86-64.so.2
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LD_SCRIPT_DEFAULT = ldscripts/elf_x86_64.xc
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endif
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ifeq (x86_32,$(findstring x86_32,$(SPECS)))
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CXX_LINK_OPT += -Wl,--dynamic-linker=/lib/ld-linux.so.2
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LD_SCRIPT_DEFAULT = ldscripts/elf_i386.xc
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endif
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ifeq (arm,$(findstring arm,$(SPECS)))
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CXX_LINK_OPT += -Wl,--dynamic-linker=/lib/ld-linux.so.3
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LD_SCRIPT_STATIC = ldscripts/armelf_linux_eabi.xc
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endif
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ifeq (arm_64,$(findstring arm_64,$(SPECS)))
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CXX_LINK_OPT += -Wl,--dynamic-linker=/lib/ld-linux-aarch64.so.1
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LD_SCRIPT_STATIC = /usr/lib/aarch64-linux-gnu/ldscripts/aarch64elf.xc
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endif
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#
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# Because we use the host compiler's libgcc, omit the Genode toolchain's
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# version and put all libraries here we depend on.
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#
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LD_LIBGCC = $(LX_LIBS_OPT)
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# use the host c++ for linking to find shared libraries in DT_RPATH library paths
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LD_CMD = $(CUSTOM_HOST_CXX)
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# disable format-string security checks, which prevent non-literal format strings
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CC_OPT += -Wno-format-security
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#
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# Disable position-independent executables (which are enabled by default on
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# Ubuntu 16.10 or newer)
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#
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CXX_LINK_OPT_NO_PIE = $(shell \
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(echo "int main(){}" | $(CUSTOM_HOST_CXX) -no-pie -x c++ - -o /dev/null >& /dev/null \
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&& echo "-no-pie") || true)
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CXX_LINK_OPT += $(CXX_LINK_OPT_NO_PIE)
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