[ipxe-devel] Unrecognised relocation type R_X86_64_32S in util/elf2efi64

Michael Brown mcb30 at ipxe.org
Thu Feb 12 11:05:53 UTC 2015

On 12/02/15 10:49, Jan Kundrát wrote:
> On Thursday, 12 February 2015 11:34:28 CEST, Michael Brown wrote:
>> Could you identify some of these relocations within the original
>> object files?  Something like:
>>   objdump -dr bin-x86_64-efi/*.o | grep -C50 R_X86_64_32S
> Uploaded to http://jkt.flaska.net/R_X86_64_32S.bz2 . I'm afraid I cannot
> interpret these data.

Thanks.  The problem seems to be that your build is not generating 
position-independent code.  One simple example is in x509_alloc_chain(), 
where my build generates

   14:   48 8d 0d 00 00 00 00    lea    0x0(%rip),%rcx        # 1b 
                         17: R_X86_64_PC32       .text.x509_free_chain-0x4

but your build generates

   14:   48 c7 40 08 00 00 00    movq   $0x0,0x8(%rax)
   1b:   00
                         18: R_X86_64_32S        .text.x509_free_chain

I'm fairly sure there's no way to generate an equivalent PE relocation 
for R_X86_64_32S, since UEFI allows objects to be loaded anywhere within 
the 64-bit address space.

The question is therefore why your build is failing to consistently 
generate position-independent code.  Could you check the build command 
line using

   make bin-x86_64-efi/x509.o.rebuild V=1

and also confirm which git revision you are building (e.g. via "git log")?



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