mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-03 18:13:01 +00:00
83 lines
2.9 KiB
Plaintext
Executable File
83 lines
2.9 KiB
Plaintext
Executable File
#! @PERL@
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# This script handles linking the tool executables on FreeBSD,
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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 these link_tool_exe_*.in scripts handle
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# the per-platform hoop-jumping.
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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 compiler invocation 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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# FreeBSD specific complications:
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#
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# - in the initial version of this file, the linker(s) it was targeted
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# at supported only -Ttext to load the code at an alternative address,
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# and did not require removing the build notes in order to function
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# correctly, so the work done by configure to determine what should go
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# into the FLAG_T_TEXT was ignored.
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#
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# - LLVM's ld.lld, for at least versions 8.0 (shipping with FreeBSD 12.1)
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# and 9.0 support the -Ttext option and behave as desired. As of
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# LLVM ld.lld version 10.0 a breaking change made -Ttext unusable,
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# however the --image-base option has the desired semantics.
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# It turns out that ld.lld has supported --image-base since at least
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# as far back as version 8.0.
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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 the value of FLAG_T_TEXT as determined by configure.
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# Previously we did this by adding these options after the first
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# word of the rest of the arguments, which works in the common case
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# when it's something like "gcc". But the linker invocation itself
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# might be multiple words, say if it's "ccache gcc". So we now put
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# the new options at the end instead.
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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 enough arguments"
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if (($#ARGV + 1) < 5);
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my $ala = $ARGV[0];
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shift; # Remove $ala from @ARGV
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# check for plausible-ish alt load address
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die "Bogus alt-load address"
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if (length($ala) < 3 || index($ala, "0x") != 0);
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my $cmd = join(" ", @ARGV, "-static -Wl,@FLAG_T_TEXT@=$ala");
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#print "link_tool_exe_freebsd: $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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