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elf: Introduce <elf_machine_sym_no_match.h>

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MIPS needs to ignore certain existing symbols during symbol lookup.
The old scheme uses the ELF_MACHINE_SYM_NO_MATCH macro, with an
inline function, within its own header, with a sysdeps override for
MIPS.  This allows re-use of the function from another file (without
having to include <dl-machine.h> or providing the default definition
for ELF_MACHINE_SYM_NO_MATCH).

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2020-04-24 22:13:03 +02:00
parent 781dacc4f4
commit 50a2d83c08
4 changed files with 79 additions and 23 deletions
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15
sysdeps/mips/dl-machine.h
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@ -467,21 +467,6 @@ elf_machine_plt_value (struct link_map *map, const ElfW(Rel) *reloc,
return value;
}
/* The semantics of zero/non-zero values of undefined symbols differs
depending on whether the non-PIC ABI is in use. Under the non-PIC
ABI, a non-zero value indicates that there is an address reference
to the symbol and thus it must always be resolved (except when
resolving a jump slot relocation) to the PLT entry whose address is
provided as the symbol's value; a zero value indicates that this
canonical-address behaviour is not required. Yet under the classic
MIPS psABI, a zero value indicates that there is an address
reference to the function and the dynamic linker must resolve the
symbol immediately upon loading. To avoid conflict, symbols for
which the dynamic linker must assume the non-PIC ABI semantics are
marked with the STO_MIPS_PLT flag. */
#define ELF_MACHINE_SYM_NO_MATCH(sym) \
((sym)->st_shndx == SHN_UNDEF && !((sym)->st_other & STO_MIPS_PLT))
#endif /* !dl_machine_h */
#ifdef RESOLVE_MAP