/usr/bin/ld.lld on powerpc64: produces a.out for which: ld-elf.so.1: assert failed: /usr/src/libexec/rtld-elf/powerpc64/reloc.c:374

[Mark Millard]

On 2017-Jan-11, at 11:48 AM, Roman Divacky <rdivacky at vlakno.cz> wrote:

> Can you try this patch?
> 
> Index: tools/lld/ELF/Target.cpp
> ===================================================================
> --- tools/lld/ELF/Target.cpp	(revision 291691)
> +++ tools/lld/ELF/Target.cpp	(working copy)
> @@ -1062,7 +1062,8 @@
> }
> 
> PPC64TargetInfo::PPC64TargetInfo() {
> -  PltRel = GotRel = R_PPC64_GLOB_DAT;
> +  GotRel = R_PPC64_GLOB_DAT;
> +  PltRel = R_PPC64_JMP_SLOT;
>   RelativeRel = R_PPC64_RELATIVE;
>   GotEntrySize = 8;
>   GotPltEntrySize = 8;

The result for the generated a.out (via ld.lld) was:

# /usr/local/bin/gdb a.out
. . .
Reading symbols from a.out...done.
(gdb) run
Starting program: /root/c_tests/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x000000001001056c in ?? ()
(gdb) bt
#0  0x000000001001056c in ?? ()
#1  0x00000000100100d8 in ?? ()
#2  0x00000000500279e0 in ._rtld_start () at /usr/src/libexec/rtld-elf/powerpc64/rtld_start.S:104
Backtrace stopped: frame did not save the PC


===
Mark Millard
markmi at dsl-only.net


On Wed, Jan 11, 2017 at 09:47:34AM -0800, Mark Millard wrote:
> 
> On 2017-Jan-11, at 8:07 AM, Ed Maste <emaste at freebsd.org> wrote:
> 
>> On 11 January 2017 at 04:15, Mark Millard <markmi at dsl-only.net> wrote:
>>> 
>>> # ./a.out
>>> ld-elf.so.1: assert failed: /usr/src/libexec/rtld-elf/powerpc64/reloc.c:374
>>> Abort trap (core dumped)
>> 
>> Would you paste the output of `readelf -r a.out`?
> 
> Here you go, for ld.lld and for ld.bfd . . .
> 
> For -fuse-ld=lld :
> 
> # readelf -r a.out
> 
> Relocation section with addend (.rela.plt):
> r_offset     r_info       r_type              st_value         st_name + r_addend
> 000010030038 000300000014 <unknown: 0x14>     0000000000000000 atexit + 0
> 000010030040 000200000014 <unknown: 0x14>     0000000000000000 _init_tls + 0
> 000010030048 000500000014 <unknown: 0x14>     0000000000000000 exit + 0
> 
> For -fuse-ld=bfd :
> 
> # readelf -r a.out
> 
> Relocation section with addend (.rela.plt):
> r_offset     r_info       r_type              st_value         st_name + r_addend
> 000010010cb8 000300000015 <unknown: 0x15>     0000000000000000 atexit + 0
> 000010010cd0 000400000015 <unknown: 0x15>     0000000000000000 _init_tls + 0
> 000010010ce8 000600000015 <unknown: 0x15>     0000000000000000 exit + 0
> 
> These were done on the powerpc64 machine (native).
> 
> 
> ===
> Mark Millard
> markmi at dsl-only.net
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