From: Palmer Dabbelt <palmer@dabbelt.com>
To: maskray@google.com
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
linux-riscv@lists.infradead.org, nathan@kernel.org,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
maskray@google.com
Subject: Re: [PATCH v2] riscv module: remove (NOLOAD)
Date: Tue, 29 Mar 2022 17:21:32 -0700 (PDT) [thread overview]
Message-ID: <mhng-891192a6-d537-444f-b092-5ae92620b233@palmer-mbp2014> (raw)
In-Reply-To: <20220322012617.3517297-1-maskray@google.com>
On Mon, 21 Mar 2022 18:26:17 PDT (-0700), maskray@google.com wrote:
> On ELF, (NOLOAD) sets the section type to SHT_NOBITS[1]. It is conceptually
> inappropriate for .plt, .got, and .got.plt sections which are always
> SHT_PROGBITS.
>
> In GNU ld, if PLT entries are needed, .plt will be SHT_PROGBITS anyway
> and (NOLOAD) will be essentially ignored. In ld.lld, since
> https://reviews.llvm.org/D118840 ("[ELF] Support (TYPE=<value>) to
> customize the output section type"), ld.lld will report a `section type
> mismatch` error (later changed to a warning). Just remove (NOLOAD) to
> fix the warning.
>
> [1] https://lld.llvm.org/ELF/linker_script.html As of today, "The
> section should be marked as not loadable" on
> https://sourceware.org/binutils/docs/ld/Output-Section-Type.html is
> outdated for ELF.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1597
> Fixes: ab1ef68e5401 ("RISC-V: Add sections of PLT and GOT for kernel module")
> Reported-by: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Fangrui Song <maskray@google.com>
> ---
> arch/riscv/include/asm/module.lds.h | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/riscv/include/asm/module.lds.h b/arch/riscv/include/asm/module.lds.h
> index 4254ff2ff049..1075beae1ac6 100644
> --- a/arch/riscv/include/asm/module.lds.h
> +++ b/arch/riscv/include/asm/module.lds.h
> @@ -2,8 +2,8 @@
> /* Copyright (C) 2017 Andes Technology Corporation */
> #ifdef CONFIG_MODULE_SECTIONS
> SECTIONS {
> - .plt (NOLOAD) : { BYTE(0) }
> - .got (NOLOAD) : { BYTE(0) }
> - .got.plt (NOLOAD) : { BYTE(0) }
> + .plt : { BYTE(0) }
> + .got : { BYTE(0) }
> + .got.plt : { BYTE(0) }
> }
> #endif
Thanks, this is on for-next (it'd be OK for fixes as well, but it's the
merge window so I'm just on one branch).
WARNING: multiple messages have this Message-ID (diff)
From: Palmer Dabbelt <palmer@dabbelt.com>
To: maskray@google.com
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
linux-riscv@lists.infradead.org, nathan@kernel.org,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
maskray@google.com
Subject: Re: [PATCH v2] riscv module: remove (NOLOAD)
Date: Tue, 29 Mar 2022 17:21:32 -0700 (PDT) [thread overview]
Message-ID: <mhng-891192a6-d537-444f-b092-5ae92620b233@palmer-mbp2014> (raw)
In-Reply-To: <20220322012617.3517297-1-maskray@google.com>
On Mon, 21 Mar 2022 18:26:17 PDT (-0700), maskray@google.com wrote:
> On ELF, (NOLOAD) sets the section type to SHT_NOBITS[1]. It is conceptually
> inappropriate for .plt, .got, and .got.plt sections which are always
> SHT_PROGBITS.
>
> In GNU ld, if PLT entries are needed, .plt will be SHT_PROGBITS anyway
> and (NOLOAD) will be essentially ignored. In ld.lld, since
> https://reviews.llvm.org/D118840 ("[ELF] Support (TYPE=<value>) to
> customize the output section type"), ld.lld will report a `section type
> mismatch` error (later changed to a warning). Just remove (NOLOAD) to
> fix the warning.
>
> [1] https://lld.llvm.org/ELF/linker_script.html As of today, "The
> section should be marked as not loadable" on
> https://sourceware.org/binutils/docs/ld/Output-Section-Type.html is
> outdated for ELF.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1597
> Fixes: ab1ef68e5401 ("RISC-V: Add sections of PLT and GOT for kernel module")
> Reported-by: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Fangrui Song <maskray@google.com>
> ---
> arch/riscv/include/asm/module.lds.h | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/riscv/include/asm/module.lds.h b/arch/riscv/include/asm/module.lds.h
> index 4254ff2ff049..1075beae1ac6 100644
> --- a/arch/riscv/include/asm/module.lds.h
> +++ b/arch/riscv/include/asm/module.lds.h
> @@ -2,8 +2,8 @@
> /* Copyright (C) 2017 Andes Technology Corporation */
> #ifdef CONFIG_MODULE_SECTIONS
> SECTIONS {
> - .plt (NOLOAD) : { BYTE(0) }
> - .got (NOLOAD) : { BYTE(0) }
> - .got.plt (NOLOAD) : { BYTE(0) }
> + .plt : { BYTE(0) }
> + .got : { BYTE(0) }
> + .got.plt : { BYTE(0) }
> }
> #endif
Thanks, this is on for-next (it'd be OK for fixes as well, but it's the
merge window so I'm just on one branch).
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next prev parent reply other threads:[~2022-03-30 0:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-18 8:26 [PATCH] riscv module: remove (NOLOAD) Fangrui Song
2022-02-18 8:26 ` Fangrui Song
2022-02-19 16:45 ` Nathan Chancellor
2022-02-19 16:45 ` Nathan Chancellor
2022-03-18 23:18 ` Palmer Dabbelt
2022-03-18 23:18 ` Palmer Dabbelt
2022-03-22 1:26 ` [PATCH v2] " Fangrui Song
2022-03-22 1:26 ` Fangrui Song
2022-03-22 1:49 ` Nathan Chancellor
2022-03-22 1:49 ` Nathan Chancellor
2022-03-30 0:21 ` Palmer Dabbelt [this message]
2022-03-30 0:21 ` Palmer Dabbelt
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