kbuild: code refactoring in modpost

Split a too long function up in smaller bits to make
prgram logic easier to follow.
A few related changes done due to parameter
changes.

No functional changes.

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

1 files changed, 137 insertions, 105 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 902ee55f327f..e4630135979c 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -937,19 +937,19 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec,
 }
 
 static unsigned int *reloc_location(struct elf_info *elf,
-                                           int rsection, Elf_Rela *r)
+                                    Elf_Shdr *sechdr, Elf_Rela *r)
 {
         Elf_Shdr *sechdrs = elf->sechdrs;
-        int section = sechdrs[rsection].sh_info;
+        int section = sechdr->sh_info;
 
         return (void *)elf->hdr + sechdrs[section].sh_offset +
                 (r->r_offset - sechdrs[section].sh_addr);
 }
 
-static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
 {
         unsigned int r_typ = ELF_R_TYPE(r->r_info);
-        unsigned int *location = reloc_location(elf, rsection, r);
+        unsigned int *location = reloc_location(elf, sechdr, r);
 
         switch (r_typ) {
         case R_386_32:
@@ -965,7 +965,7 @@ 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)
+static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
 {
         unsigned int r_typ = ELF_R_TYPE(r->r_info);
 
@@ -978,8 +978,8 @@ static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
         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));
+                              sechdr->sh_offset +
+                              (r->r_offset - sechdr->sh_addr));
                 break;
         default:
                 return 1;
@@ -987,10 +987,10 @@ static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
         return 0;
 }
 
-static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
 {
         unsigned int r_typ = ELF_R_TYPE(r->r_info);
-        unsigned int *location = reloc_location(elf, rsection, r);
+        unsigned int *location = reloc_location(elf, sechdr, r);
         unsigned int inst;
 
         if (r_typ == R_MIPS_HI16)
@@ -1010,6 +1010,128 @@ static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
         return 0;
 }
 
+static void section_rela(const char *modname, struct elf_info *elf,
+                         Elf_Shdr *sechdr, int section(const char *),
+                         int section_ref_ok(const char *))
+{
+        Elf_Sym  *sym;
+        Elf_Rela *rela;
+        Elf_Rela r;
+        unsigned int r_sym;
+        const char *fromsec;
+        const char * tosec;
+
+        Elf_Ehdr *hdr = elf->hdr;
+        Elf_Rela *start = (void *)hdr + sechdr->sh_offset;
+        Elf_Rela *stop  = (void *)start + sechdr->sh_size;
+
+        const char *secstrings = (void *)hdr +
+                                 elf->sechdrs[hdr->e_shstrndx].sh_offset;
+
+        fromsec = secstrings + sechdr->sh_name;
+        fromsec += strlen(".rela");
+        /* if from section (name) is know good then skip it */
+        if (section_ref_ok(fromsec))
+                return;
+
+        for (rela = start; rela < stop; rela++) {
+                r.r_offset = TO_NATIVE(rela->r_offset);
+#if KERNEL_ELFCLASS == ELFCLASS64
+                if (hdr->e_machine == EM_MIPS) {
+                        unsigned int r_typ;
+                        r_sym = ELF64_MIPS_R_SYM(rela->r_info);
+                        r_sym = TO_NATIVE(r_sym);
+                        r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
+                        r.r_info = ELF64_R_INFO(r_sym, r_typ);
+                } else {
+                        r.r_info = TO_NATIVE(rela->r_info);
+                        r_sym = ELF_R_SYM(r.r_info);
+                }
+#else
+                r.r_info = TO_NATIVE(rela->r_info);
+                r_sym = ELF_R_SYM(r.r_info);
+#endif
+                r.r_addend = TO_NATIVE(rela->r_addend);
+                sym = elf->symtab_start + r_sym;
+                /* Skip special sections */
+                if (sym->st_shndx >= SHN_LORESERVE)
+                        continue;
+
+                tosec = secstrings +
+                        elf->sechdrs[sym->st_shndx].sh_name;
+                if (section(tosec))
+                        warn_sec_mismatch(modname, fromsec, elf, sym, r);
+        }
+}
+
+static void section_rel(const char *modname, struct elf_info *elf,
+                        Elf_Shdr *sechdr, int section(const char *),
+                        int section_ref_ok(const char *))
+{
+        Elf_Sym *sym;
+        Elf_Rel *rel;
+        Elf_Rela r;
+        unsigned int r_sym;
+        const char *fromsec;
+        const char * tosec;
+
+        Elf_Ehdr *hdr = elf->hdr;
+        Elf_Rel *start = (void *)hdr + sechdr->sh_offset;
+        Elf_Rel *stop  = (void *)start + sechdr->sh_size;
+
+        const char *secstrings = (void *)hdr +
+                                 elf->sechdrs[hdr->e_shstrndx].sh_offset;
+
+        fromsec = secstrings + sechdr->sh_name;
+        fromsec += strlen(".rel");
+        /* if from section (name) is know good then skip it */
+        if (section_ref_ok(fromsec))
+                return;
+
+        for (rel = start; rel < stop; rel++) {
+                r.r_offset = TO_NATIVE(rel->r_offset);
+#if KERNEL_ELFCLASS == ELFCLASS64
+                if (hdr->e_machine == EM_MIPS) {
+                        unsigned int r_typ;
+                        r_sym = ELF64_MIPS_R_SYM(rel->r_info);
+                        r_sym = TO_NATIVE(r_sym);
+                        r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
+                        r.r_info = ELF64_R_INFO(r_sym, r_typ);
+                } else {
+                        r.r_info = TO_NATIVE(rel->r_info);
+                        r_sym = ELF_R_SYM(r.r_info);
+                }
+#else
+                r.r_info = TO_NATIVE(rel->r_info);
+                r_sym = ELF_R_SYM(r.r_info);
+#endif
+                r.r_addend = 0;
+                switch (hdr->e_machine) {
+                case EM_386:
+                        if (addend_386_rel(elf, sechdr, &r))
+                                continue;
+                        break;
+                case EM_ARM:
+                        if (addend_arm_rel(elf, sechdr, &r))
+                                continue;
+                        break;
+                case EM_MIPS:
+                        if (addend_mips_rel(elf, sechdr, &r))
+                                continue;
+                        break;
+                }
+                sym = elf->symtab_start + r_sym;
+                /* Skip special sections */
+                if (sym->st_shndx >= SHN_LORESERVE)
+                        continue;
+
+                tosec = secstrings +
+                        elf->sechdrs[sym->st_shndx].sh_name;
+                if (section(tosec))
+                        warn_sec_mismatch(modname, fromsec, elf, sym, r);
+        }
+}
+
 /**
  * A module includes a number of sections that are discarded
  * either when loaded or when used as built-in.
@@ -1028,108 +1150,18 @@ static void check_sec_ref(struct module *mod, const char *modname,
                           int section_ref_ok(const char *))
 {
         int i;
-        Elf_Sym  *sym;
         Elf_Ehdr *hdr = elf->hdr;
         Elf_Shdr *sechdrs = elf->sechdrs;
-        const char *secstrings = (void *)hdr +
-                                 sechdrs[hdr->e_shstrndx].sh_offset;
 
         /* Walk through all sections */
         for (i = 0; i < hdr->e_shnum; i++) {
-                const char *name = secstrings + sechdrs[i].sh_name;
-                const char *secname;
-                Elf_Rela r;
-                unsigned int r_sym;
                 /* We want to process only relocation sections and not .init */
-                if (sechdrs[i].sh_type == SHT_RELA) {
-                        Elf_Rela *rela;
-                        Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
-                        Elf_Rela *stop  = (void *)start + sechdrs[i].sh_size;
-                        name += strlen(".rela");
-                        if (section_ref_ok(name))
-                                continue;
-
-                        for (rela = start; rela < stop; rela++) {
-                                r.r_offset = TO_NATIVE(rela->r_offset);
-#if KERNEL_ELFCLASS == ELFCLASS64
-                                if (hdr->e_machine == EM_MIPS) {
-                                        unsigned int r_typ;
-                                        r_sym = ELF64_MIPS_R_SYM(rela->r_info);
-                                        r_sym = TO_NATIVE(r_sym);
-                                        r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
-                                        r.r_info = ELF64_R_INFO(r_sym, r_typ);
-                                } else {
-                                        r.r_info = TO_NATIVE(rela->r_info);
-                                        r_sym = ELF_R_SYM(r.r_info);
-                                }
-#else
-                                r.r_info = TO_NATIVE(rela->r_info);
-                                r_sym = ELF_R_SYM(r.r_info);
-#endif
-                                r.r_addend = TO_NATIVE(rela->r_addend);
-                                sym = elf->symtab_start + r_sym;
-                                /* Skip special sections */
-                                if (sym->st_shndx >= SHN_LORESERVE)
-                                        continue;
-
-                                secname = secstrings +
-                                        sechdrs[sym->st_shndx].sh_name;
-                                if (section(secname))
-                                        warn_sec_mismatch(modname, name,
-                                                          elf, sym, r);
-                        }
-                } else if (sechdrs[i].sh_type == SHT_REL) {
-                        Elf_Rel *rel;
-                        Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset;
-                        Elf_Rel *stop  = (void *)start + sechdrs[i].sh_size;
-                        name += strlen(".rel");
-                        if (section_ref_ok(name))
-                                continue;
-
-                        for (rel = start; rel < stop; rel++) {
-                                r.r_offset = TO_NATIVE(rel->r_offset);
-#if KERNEL_ELFCLASS == ELFCLASS64
-                                if (hdr->e_machine == EM_MIPS) {
-                                        unsigned int r_typ;
-                                        r_sym = ELF64_MIPS_R_SYM(rel->r_info);
-                                        r_sym = TO_NATIVE(r_sym);
-                                        r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
-                                        r.r_info = ELF64_R_INFO(r_sym, r_typ);
-                                } else {
-                                        r.r_info = TO_NATIVE(rel->r_info);
-                                        r_sym = ELF_R_SYM(r.r_info);
-                                }
-#else
-                                r.r_info = TO_NATIVE(rel->r_info);
-                                r_sym = ELF_R_SYM(r.r_info);
-#endif
-                                r.r_addend = 0;
-                                switch (hdr->e_machine) {
-                                case EM_386:
-                                        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;
-                                        break;
-                                }
-                                sym = elf->symtab_start + r_sym;
-                                /* Skip special sections */
-                                if (sym->st_shndx >= SHN_LORESERVE)
-                                        continue;
-
-                                secname = secstrings +
-                                        sechdrs[sym->st_shndx].sh_name;
-                                if (section(secname))
-                                        warn_sec_mismatch(modname, name,
-                                                          elf, sym, r);
-                        }
-                }
+                if (sechdrs[i].sh_type == SHT_RELA)
+                        section_rela(modname, elf, &elf->sechdrs[i],
+                                     section, section_ref_ok);
+                else if (sechdrs[i].sh_type == SHT_REL)
+                        section_rel(modname, elf, &elf->sechdrs[i],
+                                    section, section_ref_ok);
         }
 }