From: Emil Renner Berthing <kernel@esmil.dk>
To: linux-riscv@lists.infradead.org
Cc: "Emil Renner Berthing" <kernel@esmil.dk>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Björn Töpel" <bjorn.topel@gmail.com>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Jonathan Corbet" <corbet@lwn.net>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs
Date: Tue, 14 Jul 2020 09:40:43 +0200 [thread overview]
Message-ID: <20200714074044.10031-1-kernel@esmil.dk> (raw)
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>
---
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,
--
2.27.0
next reply other threads:[~2020-07-14 7:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 7:40 Emil Renner Berthing [this message]
2020-07-14 7:40 ` [PATCH v3 2/2] riscv: Add jump-label implementation Emil Renner Berthing
2020-07-21 0:54 ` [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs Palmer Dabbelt
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