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[Bug ld/15056] New: gld 2.23.1 mishandles R_SPARC_TLS_LDM_CALL

From: ro at TechFak dot Uni-Bielefeld.DE
Subject: [Bug ld/15056] New: gld 2.23.1 mishandles R_SPARC_TLS_LDM_CALL
Date: Wed, 23 Jan 2013 12:58:03 +0000


             Bug #: 15056
           Summary: gld 2.23.1 mishandles R_SPARC_TLS_LDM_CALL
           Product: binutils
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: address@hidden
        ReportedBy: address@hidden
                CC: address@hidden, address@hidden
    Classification: Unclassified
              Host: sparc*-*-solaris2*

After upgrading my binutils installation from 2.22 to 2.23.1, many (all?) C++
EH tests on Solaris/SPARC started failing like this:

Program received signal SIGILL, Illegal instruction.
[Switching to Thread 1 (LWP 1)]
0xff2e4f60 in __CTOR_LIST__ ()
   from ../../../sparc-sun-solaris2.11/libstdc++-v3/src/.libs/libstdc++.so.6
(gdb) where
#0  0xff2e4f60 in __CTOR_LIST__ ()
   from ../../../sparc-sun-solaris2.11/libstdc++-v3/src/.libs/libstdc++.so.6
#1  0xff249618 in __cxxabiv1::__cxa_get_globals ()
    at /vol/gcc/src/hg/trunk/local/libstdc++-v3/libsupc++/eh_globals.cc:63
#2  0xff248660 in __cxxabiv1::__cxa_allocate_exception (thrown_size=134464)
    at /vol/gcc/src/hg/trunk/local/libstdc++-v3/libsupc++/eh_alloc.cc:136
#3  0x000108d4 in h ()
    at /vol/gcc/src/hg/trunk/local/gcc/testsuite/g++.dg/eh/alias1.C:25
#4  0x00010918 in main ()
    at /vol/gcc/src/hg/trunk/local/gcc/testsuite/g++.dg/eh/alias1.C:34

If I relink libstdc++.so with gld 2.22 (no other changes), the test passes.

Looking at the __cxa_get_globals call site with gdb, I find (with gld 2.23.1):

=> 0xff249610 <__cxxabiv1::__cxa_get_globals()+32>:    call  0xff2e4f60
   0xff249614 <__cxxabiv1::__cxa_get_globals()+36>:    xor  %i0, 0, %i0
1: x/i $pc
=> 0xff249614 <__cxxabiv1::__cxa_get_globals()+36>:    xor  %i0, 0, %i0
0xff2e4f60 in __CTOR_LIST__ () from
1: x/i $pc
=> 0xff2e4f60:    unknown

Instead, with libstdc++.so relinked with gld 2.22, I see

=> 0xff2496a4 <__cxxabiv1::__cxa_get_globals()+32>:    call  0xff2e987c
   0xff2496a8 <__cxxabiv1::__cxa_get_globals()+36>:    xor  %i0, 0, %i0

In the input object (eh_globals.o), elfdump -r shows (mangled and unmangled

  R_SPARC_TLS_LDM_CALL           0x20          0  .rela.text.__c

  R_SPARC_TLS_LDM_CALL           0x20          0  .rela.text.(char) (anonymous

I don't yet have an idea what gld change is causing this, but it's a gld 2.23
regression that makes binutils 2.23 unusable on Solaris/SPARC.


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