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