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

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

[Nylon Chen]

Signed-off-by: Nylon Chen <nylon.chen@sifive.com>
---
 arch/riscv/kernel/module.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index 7c651d55fcbd..f52d8e3d4b63 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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Re: [PATCH] RISC-V: Support 32_PCREL relocation type in kernel module

[Conor Dooley]

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On Tue, Jun 13, 2023 at 03:26:44PM +0800, Nylon Chen wrote:
> Signed-off-by: Nylon Chen <nylon.chen@sifive.com>

You need to write a commit message chief :/
E.g., explain wasn't this needed before and is now.

Cheers,
Conor.

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