From: Palmer Dabbelt <palmer@dabbelt.com>
To: kernel@esmil.dk
Cc: linux-riscv@lists.infradead.org, kernel@esmil.dk,
Bjorn Topel <bjorn.topel@gmail.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
corbet@lwn.net, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs
Date: Mon, 20 Jul 2020 17:54:52 -0700 (PDT) [thread overview]
Message-ID: <mhng-958787bd-3f34-43eb-b2fd-3eeb7ff325bd@palmerdabbelt-glaptop1> (raw)
In-Reply-To: <20200714074044.10031-1-kernel@esmil.dk>
On Tue, 14 Jul 2020 00:40:43 PDT (-0700), kernel@esmil.dk wrote:
> These are needed for the __jump_table in modules using
> static keys/jump-labels with the layout from
> HAVE_ARCH_JUMP_LABEL_RELATIVE on 64bit kernels.
>
> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
> Reviewed-by: Björn Töpel <bjorn.topel@gmail.com>
> Tested-by: Björn Töpel <bjorn.topel@gmail.com>
These are on for-next. Thanks!
> ---
> Tested on the HiFive Unleashed board.
>
> No changes since v2.
>
> This patch is new in v2. It fixes an error loading modules
> containing static keys found by Björn Töpel.
>
> arch/riscv/kernel/module.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
> index 7191342c54da..104fba889cf7 100644
> --- a/arch/riscv/kernel/module.c
> +++ b/arch/riscv/kernel/module.c
> @@ -263,6 +263,13 @@ static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
> return 0;
> }
>
> +static int apply_r_riscv_add64_rela(struct module *me, u32 *location,
> + Elf_Addr v)
> +{
> + *(u64 *)location += (u64)v;
> + return 0;
> +}
> +
> static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
> Elf_Addr v)
> {
> @@ -270,6 +277,13 @@ static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
> return 0;
> }
>
> +static int apply_r_riscv_sub64_rela(struct module *me, u32 *location,
> + Elf_Addr v)
> +{
> + *(u64 *)location -= (u64)v;
> + return 0;
> +}
> +
> static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
> Elf_Addr v) = {
> [R_RISCV_32] = apply_r_riscv_32_rela,
> @@ -290,7 +304,9 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
> [R_RISCV_RELAX] = apply_r_riscv_relax_rela,
> [R_RISCV_ALIGN] = apply_r_riscv_align_rela,
> [R_RISCV_ADD32] = apply_r_riscv_add32_rela,
> + [R_RISCV_ADD64] = apply_r_riscv_add64_rela,
> [R_RISCV_SUB32] = apply_r_riscv_sub32_rela,
> + [R_RISCV_SUB64] = apply_r_riscv_sub64_rela,
> };
>
> int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
prev parent reply other threads:[~2020-07-21 0:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 7:40 [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs Emil Renner Berthing
2020-07-14 7:40 ` [PATCH v3 2/2] riscv: Add jump-label implementation Emil Renner Berthing
2020-07-21 0:54 ` Palmer Dabbelt [this message]
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