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6f8b365b65
This complements and reuses logic from Andreas Krebbel's commit
896a639bab ("s390: Avoid reloc overflows on undefined weak symbols").
Replace relative long addressing instructions of weak symbols, which
will definitely resolve to zero, with either a load address of 0 or a
a trapping insn.
This prevents the PLT32DBL relocation from overflowing in case the
binary will be loaded at 4GB or more.
bfd/
* elf64-s390.c (elf_s390_relocate_section): Replace
instructions using undefined weak symbols with relative
addressing to avoid relocation overflows.
ld/
* testsuite/ld-s390/s390.exp: Add new test.
* testsuite/ld-s390/weakundef-2.s: New test.
* testsuite/ld-s390/weakundef-2.dd: Likewise.
Reported-by: Alexander Gordeev <agordeev@linux.ibm.com>
Suggested-by: Ilya Leoshkevich <iii@linux.ibm.com>
Suggested-by: Andreas Krebbel <krebbel@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
18 lines
457 B
Plaintext
18 lines
457 B
Plaintext
tmpdir/weakundef-2: file format elf64-s390
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Disassembly of section .text:
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0+200000000 <foo>:
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.*: c0 10 00 00 00 12 [ ]*larl %r1,200000024 <d>
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.*: c0 10 00 00 00 10 [ ]*larl %r1,200000026 <wd>
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.*: e3 10 00 00 00 71 [ ]*lay %r1,0
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.*: c0 e5 00 00 00 09 [ ]*brasl %r14,200000024 <d>
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.*: c0 e5 00 00 00 07 [ ]*brasl %r14,200000026 <wd>
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.*: c0 f4 00 00 00 01 [ ]*jg .*
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0+200000024 <d>:
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.*: 07 fe [ ]*br %r14
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0+200000026 <wd>:
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.*: 07 fe [ ]*br %r14
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