https://sourceware.org/bugzilla/show_bug.cgi?id=23969
Bug ID: 23969
Summary: PowerPC64 ELFv1 --defsym func1=func2 call to func1
errors
Product: binutils
Version: 2.32 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: amodra at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
Running the gold testsuite plugin_test_defsym results in a segfault, due to the
call to "bar" branching to the opd entry for "foo". This isn't something
specific to the plugin, just compiling the testcase with
powerpc64-linux-gcc -Bgcctestdir/ -g -O2 -o test_defsym -Wl,--defsym,bar=foo
~/src/binutils-gdb/gold/testsuite/plugin_test_defsym.c
results in a test_defsym binary with the error.
The problem is caused by gold defining --defsym symbols as constants.
Target_powerpc::symval_for_branch fails to detect such function symbols as
being defined in a .opd section (only FROM_OBJECT symbols are supported), and
therefore does not look up the code entry point in the function descriptor
during relocation. Even worse, --defsym symbols have value zero at the time
Target::relax is called, so calls to symval_for_branch at that point cannot
look up descriptors even if some other mechanism was devised for detecting
symbols within .opd sections. (Target::relax is where powerpc64 adds stubs for
long branches and plt calls.)
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