From: Fangrui Song <i@maskray.me>
To: Tatsuyuki Ishi <ishitatsuyuki@gmail.com>
Cc: binutils@sourceware.org
Subject: Re: [PATCH 0/4] gas: Add support for LLVM addrsig and addrsig_sym.
Date: Wed, 25 May 2022 00:19:24 -0700 [thread overview]
Message-ID: <20220525071924.ofjz32r53hdbgchk@gmail.com> (raw)
In-Reply-To: <20220525064252.58603-1-ishitatsuyuki@gmail.com>
On 2022-05-25, Tatsuyuki Ishi via Binutils wrote:
>This patch adds support for the relevant LLVM assembler directives,
>which is a prerequisite for GCC support of the feature.
>
>[1]: https://llvm.org/docs/Extensions.html#sht-llvm-addrsig-section-address-significance-table
>
>
I have to be fair, the design of SHT_LLVM_ADDRSIG has a major problem
that it does not work with objcopy and ld -r:
https://sourceware.org/bugzilla/show_bug.cgi?id=23817
That said, using relocations would greatly increase the size of the
section and the current uleb128 does a good job on decreasing the file
size...
If ld supports SHT_LLVM_ADDRSIG, it would probably make it easier
to assemble `clang -S` output with `as`. Currently, on many targets/Linux
distributions, `clang -S` defaults to -faddrsig which makes the output
not-assembable with `as`.
next prev parent reply other threads:[~2022-05-25 7:19 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-25 6:42 Tatsuyuki Ishi
2022-05-25 6:42 ` [PATCH 1/4] elf: Add definition for SHT_LLVM_ADDRSIG Tatsuyuki Ishi
2022-05-26 10:03 ` Jan Beulich
2022-05-26 10:13 ` Tatsuyuki Ishi
2022-05-26 10:19 ` Jan Beulich
2022-05-26 10:36 ` Tatsuyuki Ishi
2022-05-27 17:28 ` Peter Collingbourne
2022-05-25 6:42 ` [PATCH 2/4] gas: Add support for LLVM addrsig and addrsig_sym directives on ELF Tatsuyuki Ishi
2022-05-25 7:23 ` Alan Modra
2022-05-25 7:49 ` Jan Beulich
2022-05-25 7:58 ` Tatsuyuki Ishi
2022-05-25 8:07 ` Fangrui Song
2022-05-25 8:34 ` Jan Beulich
2022-05-25 8:41 ` Tatsuyuki Ishi
2022-05-25 6:42 ` [PATCH 3/4] bfd: Output SH_LINK to .symtab for SHT_LLVM_ADDRSIG Tatsuyuki Ishi
2022-05-25 7:46 ` Jan Beulich
2022-05-25 6:42 ` [PATCH 4/4] gas: Add basic test for addrsig Tatsuyuki Ishi
2022-05-25 7:30 ` Alan Modra
2022-05-25 7:19 ` Fangrui Song [this message]
2022-05-25 7:34 ` [PATCH 0/4] gas: Add support for LLVM addrsig and addrsig_sym Alan Modra
2022-05-25 7:59 ` Fangrui Song
2022-05-25 8:01 ` Tatsuyuki Ishi
2022-05-25 6:46 Tatsuyuki Ishi
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