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kbuild: make better section mismatch reports on i386, arm and mips
On i386, ARM and MIPS, warn_sec_mismatch() sometimes fails to show usefull symbol name. This is because empty 'refsym' due to 0 r_addend value. This patch is to adjust r_addend value, consulting with apply_relocate() routine in kernel code. Without this patch: MODPOST vmlinux WARNING: init/built-in.o - Section mismatch: reference to .init.text: from .text between 'rest_init' (at offset 0xf4) and 'try_name' WARNING: mm/built-in.o - Section mismatch: reference to .init.text: from .text between 'kmem_cache_create' (at offset 0x18a39) and 'cache_reap' WARNING: mm/built-in.o - Section mismatch: reference to .init.text: from .text between 'kmem_cache_create' (at offset 0x18a6b) and 'cache_reap' With this patch: MODPOST vmlinux WARNING: mm/built-in.o - Section mismatch: reference to .init.text:set_up_list3s from .text between 'kmem_cache_create' (at offset 0x18a39) and 'cache_reap' WARNING: mm/built-in.o - Section mismatch: reference to .init.text:set_up_list3s from .text between 'kmem_cache_create' (at offset 0x18a6b) and 'cache_reap' Now modpost can detect "kernel_init" name (and whitelist it) and show "set_up_list3s" name. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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@ -384,6 +384,7 @@ static int parse_elf(struct elf_info *info, const char *filename)
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sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
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sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
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sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
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sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
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}
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/* Find symbol table. */
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for (i = 1; i < hdr->e_shnum; i++) {
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@ -773,6 +774,8 @@ static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
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for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
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if (sym->st_shndx != relsym->st_shndx)
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continue;
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if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
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continue;
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if (sym->st_value == addr)
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return sym;
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}
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@ -910,6 +913,68 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec,
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}
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}
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static void addend_386_rel(struct elf_info *elf, int section, Elf_Rela *r)
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{
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Elf_Shdr *sechdrs = elf->sechdrs;
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unsigned int r_typ;
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unsigned int *location;
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r_typ = ELF_R_TYPE(r->r_info);
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location = (void *)elf->hdr +
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sechdrs[sechdrs[section].sh_info].sh_offset + r->r_offset;
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switch (r_typ) {
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case R_386_32:
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r->r_addend = TO_NATIVE(*location);
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break;
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case R_386_PC32:
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r->r_addend = TO_NATIVE(*location) + 4;
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break;
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}
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}
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static void addend_arm_rel(struct elf_info *elf, int section, Elf_Rela *r)
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{
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Elf_Shdr *sechdrs = elf->sechdrs;
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unsigned int r_typ;
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unsigned int *location;
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r_typ = ELF_R_TYPE(r->r_info);
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location = (void *)elf->hdr +
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sechdrs[sechdrs[section].sh_info].sh_offset + r->r_offset;
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switch (r_typ) {
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case R_ARM_ABS32:
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r->r_addend = TO_NATIVE(*location);
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break;
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case R_ARM_PC24:
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r->r_addend = ((TO_NATIVE(*location) & 0x00ffffff) << 2) + 8;
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break;
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}
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}
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static int addend_mips_rel(struct elf_info *elf, int section, Elf_Rela *r)
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{
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Elf_Shdr *sechdrs = elf->sechdrs;
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unsigned int r_typ;
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unsigned int *location;
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unsigned int inst;
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r_typ = ELF_R_TYPE(r->r_info);
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if (r_typ == R_MIPS_HI16)
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return 1; /* skip this */
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location = (void *)elf->hdr +
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sechdrs[sechdrs[section].sh_info].sh_offset + r->r_offset;
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inst = TO_NATIVE(*location);
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switch (r_typ) {
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case R_MIPS_LO16:
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r->r_addend = ((inst & 0xffff) ^ 0x8000) - 0x8000;
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break;
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case R_MIPS_26:
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r->r_addend = (inst & 0x03ffffff) << 2;
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break;
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}
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return 0;
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}
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/**
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* A module includes a number of sections that are discarded
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* either when loaded or when used as built-in.
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@ -953,8 +1018,11 @@ static void check_sec_ref(struct module *mod, const char *modname,
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r.r_offset = TO_NATIVE(rela->r_offset);
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#if KERNEL_ELFCLASS == ELFCLASS64
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if (hdr->e_machine == EM_MIPS) {
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unsigned int r_typ;
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r_sym = ELF64_MIPS_R_SYM(rela->r_info);
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r_sym = TO_NATIVE(r_sym);
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r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
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r.r_info = ELF64_R_INFO(r_sym, r_typ);
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} else {
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r.r_info = TO_NATIVE(rela->r_info);
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r_sym = ELF_R_SYM(r.r_info);
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@ -987,8 +1055,11 @@ static void check_sec_ref(struct module *mod, const char *modname,
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r.r_offset = TO_NATIVE(rel->r_offset);
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#if KERNEL_ELFCLASS == ELFCLASS64
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if (hdr->e_machine == EM_MIPS) {
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unsigned int r_typ;
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r_sym = ELF64_MIPS_R_SYM(rel->r_info);
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r_sym = TO_NATIVE(r_sym);
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r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
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r.r_info = ELF64_R_INFO(r_sym, r_typ);
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} else {
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r.r_info = TO_NATIVE(rel->r_info);
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r_sym = ELF_R_SYM(r.r_info);
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@ -998,6 +1069,14 @@ static void check_sec_ref(struct module *mod, const char *modname,
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r_sym = ELF_R_SYM(r.r_info);
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#endif
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r.r_addend = 0;
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if (hdr->e_machine == EM_386)
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addend_386_rel(elf, i, &r);
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else if (hdr->e_machine == EM_ARM)
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addend_arm_rel(elf, i, &r);
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else if (hdr->e_machine == EM_MIPS) {
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if (addend_mips_rel(elf, i, &r))
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continue;
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}
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sym = elf->symtab_start + r_sym;
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/* Skip special sections */
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if (sym->st_shndx >= SHN_LORESERVE)
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@ -60,6 +60,9 @@ typedef union
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#define ELF64_MIPS_R_SYM(i) \
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((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
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#define ELF64_MIPS_R_TYPE(i) \
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((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
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#if KERNEL_ELFDATA != HOST_ELFDATA
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static inline void __endian(const void *src, void *dest, unsigned int size)
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