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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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05124264b0
same thing. A .c file doesn't work for cross compilation. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11174
90 lines
2.5 KiB
Plaintext
90 lines
2.5 KiB
Plaintext
#! @PERL@
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# This script handles linking the tool executables on Linux,
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# statically and at an alternative load address.
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#
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# Linking statically sidesteps all sorts of complications to do with
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# having two copies of the dynamic linker (valgrind's and the
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# client's) coexisting in the same process. The alternative load
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# address is needed because Valgrind itself will load the client at
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# whatever address it specifies, which is almost invariably the
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# default load address. Hence we can't allow Valgrind itself (viz,
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# the tool executable) to be loaded at that address.
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#
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# Unfortunately there's no standard way to do 'static link at
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# alternative address', so this program handles the per-platform
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# hoop-jumping.
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#
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#
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# What we get passed here is:
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# first arg
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# the alternative load address
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# all the rest of the args
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# the gcc invokation to do the final link, that
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# the build system would have done, left to itself
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#
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# We just let the script 'die' if something is wrong, rather than do
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# proper error reporting. We don't expect the users to run this
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# directly. It is only run as part of the build process, with
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# carefully constrained inputs.
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#
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# Linux specific complications:
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#
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# - need to support both old GNU ld and gold: use -Ttext= to
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# set the text segment address.
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#
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# - need to pass --build-id=none (that is, -Wl,--build-id=none to
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# gcc) if it accepts it, to ensure the linker doesn't add a
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# notes section which ends up at the default load address and
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# so defeats our attempts to keep that address clear for the
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# client. However, older linkers don't support this flag, so it
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# is tested for by configure.in and is shipped to us as part of
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# argv[2 ..].
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#
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#
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# So: what we actually do:
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#
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# pass the specified command to the linker as-is, except, add
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# "-static" and "-Ttext=<argv[1]>" to it.
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#
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use warnings;
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use strict;
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# expect at least: alt-load-address gcc -o foo bar.o
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die "Not enougn arguments"
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if (($#ARGV + 1) < 5);
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my $ala = $ARGV[0];
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# check for plausible-ish alt load address
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die "Bogus alt-load address"
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if (length($ala) < 3 || index($ala, "0x") != 0);
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# The cc invokation to do the final link
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my $cc = $ARGV[1];
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# and the 'restargs' are argv[2 ..]
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# so, build up the complete command here:
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# 'cc' -static -Ttext='ala' 'restargs'
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my $cmd="$cc -static -Wl,-Ttext=$ala";
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# Add the rest of the parameters
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foreach my $n (2 .. $#ARGV) {
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$cmd = "$cmd $ARGV[$n]";
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}
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print "link_tool_exe_linux: $cmd\n";
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# Execute the command:
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my $r = system("$cmd");
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if ($r == 0) {
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exit 0;
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} else {
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exit 1;
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}
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