> Betreff: Re: [vbox-dev] VBoxRT.so broken TEXTRELs since 4.3.16 > > Anna Fischer wrote: > > >> actually it's not the -nopie parameter but the following patch: > >> > >> 008_virtualbox-4.3.14-missing_define.patch > >> https://bugs.gentoo.org/514658 > >> https://www.virtualbox.org/ticket/13199 > >> > >> --- VirtualBox-4.3.14/src/VBox/Runtime/common/ldr/ldrkStuff.cpp > >> +++ VirtualBox-4.3.14/src/VBox/Runtime/common/ldr/ldrkStuff.cpp > >> @@ -368,7 +368,7 @@ > >> * We provide our own based on IPRT instead of using the kLdr ones. > >> */ > >> extern "C" const KRDROPS g_kLdrRdrFileOps; > >> -extern "C" const KRDROPS g_kLdrRdrFileOps = > >> +const KRDROPS g_kLdrRdrFileOps __attribute__((section(".rodata"))) = > >> { > >> /* .pszName = */ "IPRT", > >> /* .pNext = */ NULL, > >> > >> I don't know why this patch is required but the result is that > >> there will be a new small ".rodata" section with "aw" bits defined. > >> I don't know why this patch is necessary at all, maybe specific to > >> the other Gentoo patches. > >> > >> You can try to > >> 1) remove that patch at all. If that doesn't compile, do you see the same > >> problem as in the above mentioned ticket 13199? > > > > Yes, I get the same compiler error. I cannot compile without that patch. > > > >> If that doesn't work, > >> try to > >> 2) remove the section(".rodata") attribute. Does that work? > > > > No that doesn't seem to work. I still get the compiler error without > > that attribute. > > 1) What does the following command print > > $ objdump -xdr > out/linux.amd64/release/obj/VBoxRT/common/ldr/ldrkStuff.o > | grep -B2 g_kLdrRdrFileOps
0000000000001510 g F .text 0000000000000327 .hidden rtldrkLdrOpen
0000000000000000 *UND* 0000000000000000 RTMemAllocZTag
0000000000000260 g O .rodata 0000000000000090 .hidden
g_kLdrRdrFileOps
--
15b1: c7 00 19 09 61 19 movl $0x19610919,(%rax)
15b7: 48 8d 05 00 00 00 00 lea 0x0(%rip),%rax # 15be
<rtldrkLdrOpen+0xae>
15ba: R_X86_64_PC32 g_kLdrRdrFileOps-0x4
>
> for the build *with* the .rodata patch? This is the file that is
> linked into VBoxRT.so and causes the complaint about the relocation.
>
> For me with stock VBox the symbol is in .data.rel.ro.local and is
> hidden. When VBoxRT.so is linked, the relocation in text is resolved
> to the hidden symbol and the output has no relocation for that symbol.
>
>
> 2) *Without* that patch that adds explicit .rodata, what does
>
> $ objdump -xdr
> out/linux.amd64/release/obj/RuntimeR3/common/ldr/ldrkStuff.o | grep
> g_kLdrRdrFileOps
00000000000000c0 g O .data.rel.ro.local 0000000000000090 .hidden
g_kLdrRdrFileOps
15ba: R_X86_64_PC32 g_kLdrRdrFileOps-0x4
>
> and
>
> nm out/linux.amd64/release-/lib/RuntimeR3.a | grep -i g_kLdrRdrFileOps
> 0000000000000440 R g_kLdrRdrFileOps
>
00000000000000c0 D g_kLdrRdrFileOps
I have attached all outputs as text files as well.
Thanks for your help.
Anna
nm-without-patch.log
Description: nm-without-patch.log
objdump-without-patch.log
Description: objdump-without-patch.log
objdump-with-patch.log
Description: objdump-with-patch.log
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