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This directory contains patches of the Codezero kernel that are needed for the integration with Genode. Furthermore, some patches address issues with recent tool chains not yet supported by the official Codezero verison. :binutils-2.21.patch: The GNU assembler of binutils-2.21 complains with an error that was ignored by previous binutils versions: "Error: .size expression for ... does not evaluate to a constant" This error seems to occur if the argument of 'BEGIN_PROC' does not match the argument of 'END_PROC'. The patch fixes such inconsistencies in the code. :gcc_shared_enabled.patch: Codezero expect the tool chain to be used for the kernel to not support shared libraries. This is the case for Codesourcery's arm-non-eabi tool chain. Such tool chains use to incorporate both libgcc and libgcc_eh into the single libgcc.a library. In contrast, for tool chains built with '--enable-shared', libgcc does not contain the functions of libgcc_eh. Hence, one symbol called '__aeabi_unwind_cpp_pr0' referenced by libgcc and normally provided by libgcc_eh remains unresolved. There are two possible solutions for this problem: We could link libgcc_eh to the 'final.elf' image as expected by libgcc. However, this way, we will need to implement the the environment expected by libgcc_eh. For Codezero, this is pointless because no C++ is used. The second option is to provide a dummy symbol for '__aeabi_unwind_cpp_pr0' just to make the linker happy. This patch adds such a dummy symbol to 'loader/main.c'. :libc_search_dir.patch: The userlibs are build with w/o '-nostdinc'. Consequently, the standard search paths of the tool chain are used. Because the user land is normally build with the Codesourcery tool chain 'arm-none-linux-gnueabi', the complete glibc headers (that come with the tool chain) end up in the default search path. Coincidentally, the userlibs SConstruct file misses to supply the Codezero libc headers, which goes undetected because headers such as 'stdio.h' are silently taken from the tool chain's libc. This patch supplies Codezero's libc include-search path for building the userlibs. This enables the userlibs to be built with tool chains that do not come with a complete libc. :scons-2.0.1.patch: SCons 2.0.1 complains about the 'build_dir' argument being renamed to 'variant_dir'. This patch renames the argument where needed for building the kernel and the default container. :set_fixed_pager.patch: At some point, Codezero abandoned the facility to define the pager for a given thread via the exregs system call. Instead, the kernel hard-wires the creator of the thread as the thread's pager. This is conflicting with Genode's way of creating and paging threads. On the current version of Genode for Codezero, all threads are paged by one thread (thread 3 happens to be the global pager) within core. As a work-around to Codezero's current limitation, we define thread 3 to be the pager of all threads. :gcc_4_6_1_fixes.patch: Version 4.6.1 of GCC is more picky about dead code than previous versions and warns about unused variables. Because Codezero is build with the '-Werror' flag, these warnings cause the kernel build to fail. The patch fixes those warnings by removing the variables in question.