kbuild: make better section mismatch reports on arm

With this change we can find more symbols hereby improving
the readability of the warnings.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index b83cddb8dca9..256b3d272e2e 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -929,6 +929,26 @@ static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
         return 0;
 }
 
+static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+{
+        unsigned int r_typ = ELF_R_TYPE(r->r_info);
+
+        switch (r_typ) {
+        case R_ARM_ABS32:
+                /* From ARM ABI: (S + A) | T */
+                r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info));
+                break;
+        case R_ARM_PC24:
+                /* From ARM ABI: ((S + A) | T) - P */
+                r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset +
+                                          (r->r_offset - elf->sechdrs[rsection].sh_addr));
+                break;
+        default:
+                return 1;
+        }
+        return 0;
+}
+
 static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
 {
         unsigned int r_typ = ELF_R_TYPE(r->r_info);
@@ -1051,6 +1071,10 @@ static void check_sec_ref(struct module *mod, const char *modname,
                                         if (addend_386_rel(elf, i, &r))
                                                 continue;
                                         break;
+                                case EM_ARM:
+                                        if(addend_arm_rel(elf, i, &r))
+                                                continue;
+                                        break;
                                 case EM_MIPS:
                                         if (addend_mips_rel(elf, i, &r))
                                                 continue;