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https://github.com/AsahiLinux/u-boot
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65 lines
3 KiB
Makefile
65 lines
3 KiB
Makefile
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#
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# Copyright (C) 2012 Marek Vasut <marex@denx.de>
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#
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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#########################################################################
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##
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# make_u_boot_list - Generate contents of u_boot_list section
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# 1: The name of the resulting file (usually u-boot.lst)
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# 2: Files to analyze for possible u_boot_list entries
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#
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# This function generates the contents of the u_boot_list section,
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# including all the border symbols for it's subsections. The operation
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# of this function is as follows, numbering goes per lines:
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#
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# 1) Dump the ELF header sections from all files supplied via $(2)
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# 2) Filter out all other stuff that does not belong into .u_boot_list
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# section.
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# 3) Fix up the lines so that the resulting output is is in format
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# ".u_boot_list.*".
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# 4) Remove the last .something$, since that only contains the name
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# of the variable to be put into a subsection. This name is irelevant
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# for generation of border symbols, thus of no interest, remove it.
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# 5) Take each line and for every dot "." in that line, print the whole
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# line until that dot "." . This is important so that we have all
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# parent border symbols generated as well.
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# 6) Load every line and firstly append "\a" at the end and print the
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# line. Next, append "@" at the end and print the line. Finally,
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# append "~" at the end of line. This will make sense in conjunction
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# with 6) and 7).
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# 7) Sort the lines. It is imperative to use LC_COLLATE=C here because
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# with this, the "\a" symbol is first and "~" symbol is last. Any
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# other symbols fall inbetween. Symbols like "@", which marks the
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# end of current line (representing current section) and ".", which
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# means the line continues and thus represents subsection.
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# 8) With such ordering, all lines ending with "\a" will float at the
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# begining of all lines with the same prefix. Thus it is easy to
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# replace "\a" with __start and make it the __start border symbol.
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# Very similarly for "~", which will be always at the bottom and so
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# can be replaced by "__end" and made into the __end border symbol.
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# Finally, every line ending with "@" symbol will be transformed
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# into " *(SORT(${line}*)); " format, which in the linker parlance
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# will allow it to trap all symbols relevant to the subsection.
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#
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define make_u_boot_list
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$(1): $(2)
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$(OBJDUMP) -h $(2) | \
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sed -n -e '/.*\.u_boot_list[^ ]\+/ ! {d;n}' \
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-e 's/.*\(\.u_boot_list[^ ]\+\).*$$$$/\1/' \
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-e 's/\.[^\.]\+$$$$//' \
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-e ':s /^.\+$$$$/ { p;s/^\(.*\)\.[^\.]*$$$$/\1/;b s }' | \
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sed -n -e 'h;s/$$$$/\a/p;g;s/$$$$/@/p;g;s/$$$$/~/p;' | \
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LC_COLLATE=C sort -u | \
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sed -n -e '/\a$$$$/ { s/\./_/g;s/\a$$$$/__start = .;/p; }'\
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-e '/~$$$$/ { s/\./_/g;s/~$$$$/__end = .;/p; }'\
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-e '/@$$$$/ { s/\(.*\)@$$$$/*(SORT(\1.*));/p }' > $(1)
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endef
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