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>

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index b83cddb..256b3d2 100644 (file)
--- 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;