On Fri, 2018-10-26 at 23:50 +0200, Mark Wielaard wrote: > eu-strip already supports --reloc-debug-sections to resolve all > relocations between .debug_ sections while creating a separate > .debug file with -f. It is sometimes useful to do the same without > doing any other stripping. > > --reloc-debug-sections-only > Similar to --reloc-debug-sections, but resolve all > trivial relocations between debug sections in > place. No other stripping is performed (operation > is not reversable, incompatible with -f, -g, > --remove-comment and --remove-section) > > For example to ease debugging, tracing and profiling some distributions > ship an uncompressed vmlinux ELF file which includes DWARF debuginfo. > Since the vmlinux ELF kernel is relocatable, the relocations between the > .debug sections are also still left in. On Fedora this file is 662M. > eu-strip --reloc-debug-sections-only will remove more than 250MB of > (unneeded) relocations between the .debug sections. > > To reuse as much code as possible this patch series first refactors > some of the code. It also makes it so that the type of ELF file doesn't > matter for doing relocations (normally it only makes sense for ET_REL > files, but the vmlinux ELF image is an ET_EXEC with SHT_RELA sections). > > It also adds a new testcase to run-strip-reloc.sh to make sure that the > result of creating a separate debug file using --reloc-debug-sections > is identical to creating a separate debug file and then running eu-strip > with --reloc-debug-sections-only. > > [PATCH 1/4] strip: Always copy over any phdrs if there are any > [PATCH 2/4] strip: Split out debug section relocation into separate helper > [PATCH 3/4] strip: Extract code to update shdrstrndx into new common function > [PATCH 4/4] strip: Add --reloc-debug-sections-only option
I pushed these 4 patches to master. Cheers, Mark
