blob: 79a1da01e3a2bb9e0b313ad8e9d8671bc3f2eed3 [file] [log] [blame]
Marek Vasut97b24d32012-10-19 05:00:10 +00001#
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(${line}*)); " format, which in the linker parlance
50# will allow it to trap all symbols relevant to the subsection.
51#
52define make_u_boot_list
53$(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)
64endef