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From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug libdw/28220] dwarf_location_attr returns high-bit junk from
 .debug_addr when fetching 32-bit addresses
Date: Wed, 08 Sep 2021 16:01:09 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28220

--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
Turns out we could have caught this with the varlocs testcase.
Before the fix:

$ for i in testfile-vars-*.o; do echo $i; tests/varlocs --debug --exprlocs =
-e
$i | grep exprloc; done
testfile-vars-clang-dwarf4-32.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-clang-dwarf4-64.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-clang-dwarf5-32.o
    location (exprloc) {addr: 0x400000000}
    location (exprloc) {addr: 0x616c630000000004}
testfile-vars-clang-dwarf5-64.o
    location (exprloc) {addr: 0x0}
    location (exprloc) {addr: 0x4}
testfile-vars-gcc-dwarf4-32.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-gcc-dwarf4-64.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-gcc-dwarf5-32.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-gcc-dwarf5-64.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}

With the patch:

$ for i in testfile-vars-*.o; do echo $i; LD_LIBRARY_PATH=3Dlibelf:libdw
tests/varlocs --debug --exprlocs -e $i | grep exprloc; done
testfile-vars-clang-dwarf4-32.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-clang-dwarf4-64.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-clang-dwarf5-32.o
    location (exprloc) {addr: 0x0}
    location (exprloc) {addr: 0x4}
testfile-vars-clang-dwarf5-64.o
    location (exprloc) {addr: 0x0}
    location (exprloc) {addr: 0x4}
testfile-vars-gcc-dwarf4-32.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-gcc-dwarf4-64.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-gcc-dwarf5-32.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}
testfile-vars-gcc-dwarf5-64.o
    location (exprloc) {addr(0x0)}
    location (exprloc) {addr(0x4)}

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