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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
This directory contains library description files. Each '<libname>.mk' file holds the instruction for building the library '<libname>'. These makefiles are never used directly but they are called from the build system when required. When called, the build system passes the following variables: :'BASE_DIR': This is the base directory of the source tree. Source codes are specified by setting the 'SRC_CC' and 'SRC_C' variables. The source code locations must be specified via 'vpath'. A library can include other libraries by setting the 'LIBS' variable. Each '<libname>.mk' file must include the 'lib.mk' role file: ! include $(BASE_DIR)/mk/lib.mk Libraries implementing one and the same library interface may have specific implementations for different platforms. Such platform-specific '<libname>.mk' files should be placed into corresponding subdirectories. For example, the 'linux'-specific implementation of the 'server' library resides in the 'linux/' subdirectory. The build system automatically searches the right '<libname>.mk' file by evaluating the 'SPECS' configuration variable. If 'SPECS' is set to 'host linux', the build system will look into the directories './', './host', and './linux'.