RISC-V: Support CALL relocation type in kernel module

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

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index be717bd7cea7..3f2730840c25 100644
--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -141,6 +141,27 @@ static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location,
         return 0;
 }
 
+static int apply_r_riscv_call_rela(struct module *me, u32 *location,
+                                   Elf_Addr v)
+{
+        s64 offset = (void *)v - (void *)location;
+        s32 fill_v = offset;
+        u32 hi20, lo12;
+
+        if (offset != fill_v) {
+                pr_err(
+                  "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
+                  me->name, v, location);
+                return -EINVAL;
+        }
+
+        hi20 = (offset + 0x800) & 0xfffff000;
+        lo12 = (offset - hi20) & 0xfff;
+        *location = (*location & 0xfff) | hi20;
+        *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
+        return 0;
+}
+
 static int apply_r_riscv_relax_rela(struct module *me, u32 *location,
                                     Elf_Addr v)
 {
@@ -157,6 +178,7 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
         [R_RISCV_PCREL_LO12_S]          = apply_r_riscv_pcrel_lo12_s_rela,
         [R_RISCV_GOT_HI20]              = apply_r_riscv_got_hi20_rela,
         [R_RISCV_CALL_PLT]              = apply_r_riscv_call_plt_rela,
+        [R_RISCV_CALL]                  = apply_r_riscv_call_rela,
         [R_RISCV_RELAX]                 = apply_r_riscv_relax_rela,
 };