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SubjectRe: [PATCH v4 mips-next 0/7] MIPS: vmlinux.lds.S sections fixes & cleanup
From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Date: Sat, 9 Jan 2021 12:12:59 +0100

> On Thu, Jan 07, 2021 at 12:33:38PM +0000, Alexander Lobakin wrote:
>> This series hunts the problems discovered after manual enabling of
>> ARCH_WANT_LD_ORPHAN_WARN. Notably:
>> - adds the missing PAGE_ALIGNED_DATA() section affecting VDSO
>> placement (marked for stable);
>> - properly stops .eh_frame section generation.
>>
>> Compile and runtime tested on MIPS32R2 CPS board with no issues
>> using two different toolkits:
>> - Binutils 2.35.1, GCC 10.2.0;
>> - LLVM stack 11.0.0.
>>
>> Since v3 [2]:
>> - fix the third patch as GNU stack emits .rel.dyn into VDSO for
>> some reason if .cfi_sections is specified.
>>
>> Since v2 [1]:
>> - stop discarding .eh_frame and just prevent it from generating
>> (Kees);
>> - drop redundant sections assertions (Fangrui);
>> - place GOT table in .text instead of asserting as it's not empty
>> when building with LLVM (Nathan);
>> - catch compound literals in generic definitions when building with
>> LD_DEAD_CODE_DATA_ELIMINATION (Kees);
>> - collect two Reviewed-bys (Kees).
>>
>> Since v1 [0]:
>> - catch .got entries too as LLD may produce it (Nathan);
>> - check for unwanted sections to be zero-sized instead of
>> discarding (Fangrui).
>>
>> [0] https://lore.kernel.org/linux-mips/20210104121729.46981-1-alobakin@pm.me
>> [1] https://lore.kernel.org/linux-mips/20210106200713.31840-1-alobakin@pm.me
>> [2] https://lore.kernel.org/linux-mips/20210107115120.281008-1-alobakin@pm.me
>>
>> Alexander Lobakin (7):
>> MIPS: vmlinux.lds.S: add missing PAGE_ALIGNED_DATA() section
>> MIPS: vmlinux.lds.S: add ".gnu.attributes" to DISCARDS
>> MIPS: properly stop .eh_frame generation
>> MIPS: vmlinux.lds.S: catch bad .rel.dyn at link time
>> MIPS: vmlinux.lds.S: explicitly declare .got table
>> vmlinux.lds.h: catch compound literals into data and BSS
>> MIPS: select ARCH_WANT_LD_ORPHAN_WARN
>
> this breaks my builds:
>
> LD vmlinux.o
> MODPOST vmlinux.symvers
> MODINFO modules.builtin.modinfo
> GEN modules.builtin
> LD .tmp_vmlinux.kallsyms1
> mips64-linux-gnu-ld: Unexpected run-time relocations (.rel) detected!

I think they should be handled as it's done for ARM64 [0]. Will do v5
soon.

[0] https://elixir.bootlin.com/linux/v5.11-rc2/source/arch/arm64/kernel/vmlinux.lds.S#L219

> $ mips64-linux-gnu-ld --version
> GNU ld version 2.27-3.fc24
>
> $ mips64-linux-gnu-gcc --version
> mips64-linux-gnu-gcc (GCC) 6.1.1 20160621 (Red Hat Cross 6.1.1-2)
>
> Thomas.

Thanks,
Alex

> --
> Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
> good idea. [ RFC1925, 2.3 ]

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