llvm-project

Author SHA1 Message Date

Douglas Yung 6a7a208357 Add requirement for aarch64-registered-target to test change added in 42e3f97a9d. 2021-03-09 12:26:15 -08:00

Author	SHA1	Message	Date
Douglas Yung	6a7a208357	Add requirement for aarch64-registered-target to test change added in `42e3f97a9d`.	2021-03-09 12:26:15 -08:00
Fangrui Song	42e3f97a9d	[MC] Change ELFOSABI_NONE to ELFOSABI_GNU for SHF_GNU_RETAIN GNU ld does not give SHF_GNU_RETAIN GC root semantics for ELFOSABI_NONE. (https://sourceware.org/pipermail/binutils/2021-March/115581.html) This allows GNU ld to interpret SHF_GNU_RETAIN and avoids a gold quirk https://sourceware.org/bugzilla/show_bug.cgi?id=27490 Because ELFObjectWriter is in an anonymous namespace, I have to place `markGnuAbi` in the parent MCObjectWriter. Differential Revision: https://reviews.llvm.org/D97976	2021-03-09 09:59:47 -08:00
Fangrui Song	1477ed8465	[MC] Support SHF_GNU_RETAIN as section flag 'R' On Linux target triples, GNU as sets EI_OSABI to ELFOSABI_GNU when SHF_GNU_RETAIN is used。 On `--freebsd`, it usually sets EI_OSABI to ELFOSABI_FREEBSD. GNU ld respects SHF_GNU_RETAIN only for ELFOSABI_FREEBSD/ELFOSABI_GNU. https://sourceware.org/bugzilla/show_bug.cgi?id=27282 MC doesn't set ELFOSABI_GNU for SHF_GNU_RETAIN/STB_GNU_UNIQUE/STT_GNU_IFUNC. MC assembled object files do not have special semantics in GNU ld. Reviewed By: psmith Differential Revision: https://reviews.llvm.org/D95730	2021-02-02 09:34:09 -08:00

Fangrui Song

42e3f97a9d

[MC] Change ELFOSABI_NONE to ELFOSABI_GNU for SHF_GNU_RETAIN

GNU ld does not give SHF_GNU_RETAIN GC root semantics for ELFOSABI_NONE.
(https://sourceware.org/pipermail/binutils/2021-March/115581.html)

This allows GNU ld to interpret SHF_GNU_RETAIN and avoids a gold quirk
https://sourceware.org/bugzilla/show_bug.cgi?id=27490

Because ELFObjectWriter is in an anonymous namespace, I have to place
`markGnuAbi` in the parent MCObjectWriter.

Differential Revision: https://reviews.llvm.org/D97976

2021-03-09 09:59:47 -08:00

Fangrui Song

1477ed8465

[MC] Support SHF_GNU_RETAIN as section flag 'R'

On Linux target triples, GNU as sets EI_OSABI to ELFOSABI_GNU when SHF_GNU_RETAIN is used。
On `*-*-freebsd`, it usually sets EI_OSABI to ELFOSABI_FREEBSD.

GNU ld respects SHF_GNU_RETAIN only for ELFOSABI_FREEBSD/ELFOSABI_GNU.
https://sourceware.org/bugzilla/show_bug.cgi?id=27282

MC doesn't set ELFOSABI_GNU for SHF_GNU_RETAIN/STB_GNU_UNIQUE/STT_GNU_IFUNC.
MC assembled object files do not have special semantics in GNU ld.

Reviewed By: psmith

Differential Revision: https://reviews.llvm.org/D95730

2021-02-02 09:34:09 -08:00

3 Commits