[Bug nptl/26566] nptl/tst-thread-exit-clobber fails on powerpc/powerpc64 with GCC 10.2

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26566

--- Comment #10 from Florian Weimer <fweimer at redhat dot com> ---
Please check the disassembly of _Unwind_RaiseException in libgcc_s.so.1 to
check whether it contains code to save vector registers, perhaps like this:

gdb -batch -ex "disassemble/s _Unwind_RaiseException" /lib64/libgcc_s.so.1

If GCC defaults to POWER8 instructions, it looks like this:

Dump of assembler code for function _Unwind_RaiseException:
../../../libgcc/unwind.inc:
87      {
   0x000000000000c610 <+0>:     addis   r2,r12,3
   0x000000000000c614 <+4>:     addi    r2,r2,-18704
   0x000000000000c618 <+8>:     mr      r0,r1
   0x000000000000c61c <+12>:    stdu    r1,-4096(r1)
   0x000000000000c620 <+16>:    stdu    r0,-528(r1)
   0x000000000000c624 <+20>:    mflr    r0
   0x000000000000c628 <+24>:    stfd    f14,4480(r1)
   0x000000000000c62c <+28>:    stfd    f15,4488(r1)
   0x000000000000c630 <+32>:    stfd    f16,4496(r1)
   0x000000000000c634 <+36>:    stfd    f17,4504(r1)
   0x000000000000c638 <+40>:    stfd    f18,4512(r1)
[…]
   0x000000000000c6cc <+188>:   beq     0xc6d4 <_Unwind_RaiseException+196>
   0x000000000000c6d0 <+192>:   std     r2,4648(r1)

88        struct _Unwind_Context this_context, cur_context;
89        _Unwind_Reason_Code code;
90        unsigned long frames;
91      
92        /* Set up this_context to describe the current stack frame.  */
93        uw_init_context (&this_context);
   0x000000000000c6d4 <+196>:   mfcr    r0
   0x000000000000c6d8 <+200>:   mflr    r5
   0x000000000000c6dc <+204>:   addi    r27,r1,3000
   0x000000000000c6e0 <+208>:   addi    r4,r1,4624
   0x000000000000c6e4 <+212>:   mr      r28,r3
   0x000000000000c6e8 <+216>:   mr      r3,r27
   0x000000000000c6ec <+220>:   addi    r30,r1,1920
   0x000000000000c6f0 <+224>:   addi    r29,r1,32
   0x000000000000c6f4 <+228>:   stw     r0,4088(r1)
   0x000000000000c6f8 <+232>:   stw     r0,4096(r1)
   0x000000000000c6fc <+236>:   stw     r0,4104(r1)
   0x000000000000c700 <+240>:   li      r0,4144
   0x000000000000c704 <+244>:   stvx    v20,r1,r0
   0x000000000000c708 <+248>:   li      r0,4160
   0x000000000000c70c <+252>:   stvx    v21,r1,r0
[…]

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