From 5b24c0715fc4c71e60e9a684248cc49d62dfa900 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Fri, 18 Jan 2008 21:49:29 +0100 Subject: [PATCH] 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 --- scripts/mod/modpost.c | 242 ++++++++++++++++++++++++------------------ 1 file 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); } } -- 2.20.1