helper.mk

   1 #
   2 # Copyright (C) 2012 Marek Vasut <marex@denx.de>
   3 #
   4 # See file CREDITS for list of people who contributed to this
   5 # project.
   6 #
   7 # This program is free software; you can redistribute it and/or
   8 # modify it under the terms of the GNU General Public License as
   9 # published by the Free Software Foundation; either version 2 of
  10 # the License, or (at your option) any later version.
  11 #
  12 #########################################################################
  13
  14 ##
  15 # make_u_boot_list - Generate contents of u_boot_list section
  16 # 1:            The name of the resulting file (usually u-boot.lst)
  17 # 2:            Files to analyze for possible u_boot_list entries
  18 #
  19 # This function generates the contents of the u_boot_list section,
  20 # including all the border symbols for it's subsections. The operation
  21 # of this function is as follows, numbering goes per lines:
  22 #
  23 # 1) Dump the ELF header sections from all files supplied via $(2)
  24 # 2) Filter out all other stuff that does not belong into .u_boot_list
  25 #    section.
  26 # 3) Fix up the lines so that the resulting output is is in format
  27 #    ".u_boot_list.*".
  28 # 4) Remove the last .something$, since that only contains the name
  29 #    of the variable to be put into a subsection. This name is irelevant
  30 #    for generation of border symbols, thus of no interest, remove it.
  31 # 5) Take each line and for every dot "." in that line, print the whole
  32 #    line until that dot "." . This is important so that we have all
  33 #    parent border symbols generated as well.
  34 # 6) Load every line and firstly append "\a" at the end and print the
  35 #    line. Next, append "@" at the end and print the line. Finally,
  36 #    append "~" at the end of line. This will make sense in conjunction
  37 #    with 6) and 7).
  38 # 7) Sort the lines. It is imperative to use LC_COLLATE=C here because
  39 #    with this, the "\a" symbol is first and "~" symbol is last. Any
  40 #    other symbols fall inbetween. Symbols like "@", which marks the
  41 #    end of current line (representing current section) and ".", which
  42 #    means the line continues and thus represents subsection.
  43 # 8) With such ordering, all lines ending with "\a" will float at the
  44 #    begining of all lines with the same prefix. Thus it is easy to
  45 #    replace "\a" with __start and make it the __start border symbol.
  46 #    Very similarly for "~", which will be always at the bottom and so
  47 #    can be replaced by "__end" and made into the __end border symbol.
  48 #    Finally, every line ending with "@" symbol will be transformed
  49 #    into " *(SORT(${line}*)); " format, which in the linker parlance
  50 #    will allow it to trap all symbols relevant to the subsection.
  51 #
  52 define make_u_boot_list
  53 $(1): $(2)
  54         $(OBJDUMP) -h $(2) | \
  55         sed -n -e '/.*\.u_boot_list[^ ]\+/ ! {d;n}' \
  56                 -e 's/.*\(\.u_boot_list[^ ]\+\).*$$$$/\1/' \
  57                 -e 's/\.[^\.]\+$$$$//' \
  58                 -e ':s /^.\+$$$$/ { p;s/^\(.*\)\.[^\.]*$$$$/\1/;b s }' | \
  59         sed -n -e 'h;s/$$$$/\a/p;g;s/$$$$/@/p;g;s/$$$$/~/p;' | \
  60         LC_COLLATE=C sort -u | \
  61         sed -n -e '/\a$$$$/ { s/\./_/g;s/\a$$$$/__start = .;/p; }'\
  62                 -e '/~$$$$/ { s/\./_/g;s/~$$$$/__end = .;/p; }'\
  63                 -e '/@$$$$/ { s/\(.*\)@$$$$/*(SORT(\1.*));/p }' > $(1)
  64 endef