linux-kernel - Re: [PATCH v2] RISC-V: Support 32_PCREL relocation type in kernel module

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Message-ID: <20230615-unvisited-deceit-9beab8ce987a@wendy>
Date:   Thu, 15 Jun 2023 08:37:59 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Nylon Chen <nylon.chen@...ive.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <jszhang@...nel.org>, <ajones@...tanamicro.com>,
        <aou@...s.berkeley.edu>, <palmer@...belt.com>,
        <paul.walmsley@...ive.com>, <greentime.hu@...ive.com>,
        <zong.li@...ive.com>, <nylon7717@...il.com>
Subject: Re: [PATCH v2] RISC-V: Support 32_PCREL relocation type in kernel
 module

Hey Nylon, thanks for the update.

On Thu, Jun 15, 2023 at 03:23:02PM +0800, Nylon Chen wrote:
> Fix the 'unsupported relocation type' error caused by
> enabling the -fasynchronous-unwind-tables flag,
> which generates relocation types that are not supported.

What commit adds the -fasynchronous-unwind-tables flag?
Should there be a Fixes: tag for that commit?

Cheers,
Conor.

> 
> Signed-off-by: Nylon Chen <nylon.chen@...ive.com>
> Reviewed-by: Zong Li <zong.li@...ive.com>
> ---
> Changed in v2:
> - add commit message.
> 
>  arch/riscv/kernel/module.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
> index 7c651d55fcbd..65be0360a494 100644
> --- a/arch/riscv/kernel/module.c
> +++ b/arch/riscv/kernel/module.c
> @@ -310,6 +310,15 @@ static int apply_r_riscv_sub64_rela(struct module *me, u32 *location,
>  	return 0;
>  }
>  
> +static int apply_r_riscv_pcrel_32_rela(struct module *me, u32 *location,
> +				       Elf_Addr v)
> +{
> +	ptrdiff_t offset = (void *)v - (void *)location;
> +
> +	*location = (*location & 0xffff0000) | (offset & 0xffff);
> +	return 0;
> +}
> +
>  static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
>  				Elf_Addr v) = {
>  	[R_RISCV_32]			= apply_r_riscv_32_rela,
> @@ -335,6 +344,7 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
>  	[R_RISCV_SUB16]			= apply_r_riscv_sub16_rela,
>  	[R_RISCV_SUB32]			= apply_r_riscv_sub32_rela,
>  	[R_RISCV_SUB64]			= apply_r_riscv_sub64_rela,
> +	[R_RISCV_32_PCREL]		= apply_r_riscv_pcrel_32_rela,
>  };
>  
>  int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
> -- 
> 2.40.1
> 

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