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Diffstat (limited to 'helper.mk')
| -rw-r--r-- | helper.mk | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/helper.mk b/helper.mk new file mode 100644 index 0000000..79a1da0 --- /dev/null +++ b/helper.mk @@ -0,0 +1,64 @@ +# +# Copyright (C) 2012 Marek Vasut <marex@denx.de> +# +# See file CREDITS for list of people who contributed to this +# project. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation; either version 2 of +# the License, or (at your option) any later version. +# +######################################################################### + +## +# make_u_boot_list - Generate contents of u_boot_list section +# 1: The name of the resulting file (usually u-boot.lst) +# 2: Files to analyze for possible u_boot_list entries +# +# This function generates the contents of the u_boot_list section, +# including all the border symbols for it's subsections. The operation +# of this function is as follows, numbering goes per lines: +# +# 1) Dump the ELF header sections from all files supplied via $(2) +# 2) Filter out all other stuff that does not belong into .u_boot_list +# section. +# 3) Fix up the lines so that the resulting output is is in format +# ".u_boot_list.*". +# 4) Remove the last .something$, since that only contains the name +# of the variable to be put into a subsection. This name is irelevant +# for generation of border symbols, thus of no interest, remove it. +# 5) Take each line and for every dot "." in that line, print the whole +# line until that dot "." . This is important so that we have all +# parent border symbols generated as well. +# 6) Load every line and firstly append "\a" at the end and print the +# line. Next, append "@" at the end and print the line. Finally, +# append "~" at the end of line. This will make sense in conjunction +# with 6) and 7). +# 7) Sort the lines. It is imperative to use LC_COLLATE=C here because +# with this, the "\a" symbol is first and "~" symbol is last. Any +# other symbols fall inbetween. Symbols like "@", which marks the +# end of current line (representing current section) and ".", which +# means the line continues and thus represents subsection. +# 8) With such ordering, all lines ending with "\a" will float at the +# begining of all lines with the same prefix. Thus it is easy to +# replace "\a" with __start and make it the __start border symbol. +# Very similarly for "~", which will be always at the bottom and so +# can be replaced by "__end" and made into the __end border symbol. +# Finally, every line ending with "@" symbol will be transformed +# into " *(SORT(${line}*)); " format, which in the linker parlance +# will allow it to trap all symbols relevant to the subsection. +# +define make_u_boot_list +$(1): $(2) + $(OBJDUMP) -h $(2) | \ + sed -n -e '/.*\.u_boot_list[^ ]\+/ ! {d;n}' \ + -e 's/.*\(\.u_boot_list[^ ]\+\).*$$$$/\1/' \ + -e 's/\.[^\.]\+$$$$//' \ + -e ':s /^.\+$$$$/ { p;s/^\(.*\)\.[^\.]*$$$$/\1/;b s }' | \ + sed -n -e 'h;s/$$$$/\a/p;g;s/$$$$/@/p;g;s/$$$$/~/p;' | \ + LC_COLLATE=C sort -u | \ + sed -n -e '/\a$$$$/ { s/\./_/g;s/\a$$$$/__start = .;/p; }'\ + -e '/~$$$$/ { s/\./_/g;s/~$$$$/__end = .;/p; }'\ + -e '/@$$$$/ { s/\(.*\)@$$$$/*(SORT(\1.*));/p }' > $(1) +endef |