RISC-V: Support SUB32 relocation type in kernel module

Signed-off-by: Zong Li <zong@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index 73ea36c..5dddba3 100644 (file)
--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -256,6 +256,13 @@ static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
        return 0;
 }
 
+static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
+                                   Elf_Addr v)
+{
+       *(u32 *)location -= (*(u32 *)v);
+       return 0;
+}
+
 static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
                                Elf_Addr v) = {
        [R_RISCV_64]                    = apply_r_riscv_64_rela,
@@ -275,6 +282,7 @@ 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_SUB32]                 = apply_r_riscv_sub32_rela,
 };
 
 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,