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3be08ea472
The _gp_disp is a magic symbol, always implicitly defined by the linker.
It does not make a sense to write it into symbol tables for output files.
Moreover, now if the linker gets a version script, the _gp_disp symbol
gets zero version definition index. The zero index means[1]:
"The symbol is local, not available outside the object."
But the _gp_disp symbol has GLOBAL binding. That confuses some tools
like for example the LLD linker when they get such files as inputs.
This patch fixes the problem - it prevents writing the _gp_disp symbol
in regular and dynamic symbol tables.
This was tested by running LD test suite on a mipsel-linux board.
References:
[1] "Linux Standard Base Specification", Section "10.7.2 Symbol
Version Table", p. 32
2018-05-03 Simon Atanasyan <simon@atanasyan.com>
bfd/
* elf32-mips.c: (elf32_mips_fixup_symbol): New function.
(elf_backend_fixup_symbol): New macro.
* elfxx-mips.c: (mips_elf_output_extsym): Discard _gp_disp
handling.
(_bfd_mips_elf_finish_dynamic_symbol): Likewise.
ld/
* testsuite/ld-mips-elf/gp-disp-sym.d: New test.
* testsuite/ld-mips-elf/gp-disp-sym.s: New test source.
* testsuite/ld-mips-elf/mips-elf.exp: Run the new test.
* testsuite/ld-mips-elf/mips16-pic-2.ad: Update for _gp_disp
symbol removal.
* testsuite/ld-mips-elf/mips16-pic-2.nd: Likewise.
* testsuite/ld-mips-elf/pic-and-nonpic-3a.dd: Likewise.
* testsuite/ld-mips-elf/tlslib-o32-hidden.got: Likewise.
* testsuite/ld-mips-elf/tlslib-o32-ver.got: Likewise.
* testsuite/ld-mips-elf/tlslib-o32.got: Likewise.
40 lines
866 B
Plaintext
40 lines
866 B
Plaintext
# GOT layout:
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#
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# -32752: lazy resolution function
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# -32748: reserved for module pointer
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# -32744: the GOT page entry
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# -32740: foo's GOT entry
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# -32736: ext's GOT entry
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.*
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Disassembly of section \.text:
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00000800 <foo>:
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800: 3c1c0001 lui gp,0x1
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804: 279c7bf0 addiu gp,gp,31728
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808: 0399e021 addu gp,gp,t9
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80c: 8f99801c lw t9,-32740\(gp\)
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810: 8f828018 lw v0,-32744\(gp\)
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814: 03200008 jr t9
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818: 24420000 addiu v0,v0,0
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0000081c <bar>:
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81c: f000 6a01 li v0,1
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820: f3cf 0a10 la v0,83f0 .*
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824: f400 3240 sll v0,16
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828: e269 addu v0,v1
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82a: f030 9a60 lw v1,-32736\(v0\)
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82e: 659a move gp,v0
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830: eb00 jr v1
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832: 653b move t9,v1
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#...
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Disassembly of section \.MIPS\.stubs:
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00000c00 <_MIPS_STUBS_>:
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c00: 8f998010 lw t9,-32752\(gp\)
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c04: 03e07825 move t7,ra
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c08: 0320f809 jalr t9
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c0c: 24180004 li t8,4
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\.\.\.
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