diff options
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/mod/modpost.c | 64 |
1 files changed, 47 insertions, 17 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index eeaf5747682..844f84b0818 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -451,6 +451,29 @@ static char *get_modinfo(void *modinfo, unsigned long modinfo_len, return NULL; } +/** + * Find symbol based on relocation record info. + * In some cases the symbol supplied is a valid symbol so + * return refsym. If st_name != 0 we assume this is a valid symbol. + * In other cases the symbol needs to be looked up in the symbol table + * based on section and address. + * **/ +static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, + Elf_Sym *relsym) +{ + Elf_Sym *sym; + + if (relsym->st_name != 0) + return relsym; + for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { + if (sym->st_shndx != relsym->st_shndx) + continue; + if (sym->st_value == addr) + return sym; + } + return NULL; +} + /* * Find symbols before or equal addr and after addr - in the section sec **/ @@ -499,8 +522,9 @@ static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, static void warn_sec_mismatch(const char *modname, const char *fromsec, struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) { - Elf_Sym *before; - Elf_Sym *after; + const char *refsymname = ""; + Elf_Sym *before, *after; + Elf_Sym *refsym; Elf_Ehdr *hdr = elf->hdr; Elf_Shdr *sechdrs = elf->sechdrs; const char *secstrings = (void *)hdr + @@ -509,29 +533,34 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec, find_symbols_between(elf, r.r_offset, fromsec, &before, &after); + refsym = find_elf_symbol(elf, r.r_addend, sym); + if (refsym && strlen(elf->strtab + refsym->st_name)) + refsymname = elf->strtab + refsym->st_name; + if (before && after) { - warn("%s - Section mismatch: reference to %s from %s " - "between '%s' (at offset 0x%lx) and '%s'\n", - modname, secname, fromsec, + warn("%s - Section mismatch: reference to %s:%s from %s " + "between '%s' (at offset 0x%llx) and '%s'\n", + modname, secname, refsymname, fromsec, elf->strtab + before->st_name, - (long)(r.r_offset - before->st_value), + (long long)r.r_offset, elf->strtab + after->st_name); } else if (before) { - warn("%s - Section mismatch: reference to %s from %s " - "after '%s' (at offset 0x%lx)\n", - modname, secname, fromsec, + warn("%s - Section mismatch: reference to %s:%s from %s " + "after '%s' (at offset 0x%llx)\n", + modname, secname, refsymname, fromsec, elf->strtab + before->st_name, - (long)(r.r_offset - before->st_value)); + (long long)r.r_offset); } else if (after) { - warn("%s - Section mismatch: reference to %s from %s " - "before '%s' (at offset -0x%lx)\n", - modname, secname, fromsec, + warn("%s - Section mismatch: reference to %s:%s from %s " + "before '%s' (at offset -0x%llx)\n", + modname, secname, refsymname, fromsec, elf->strtab + before->st_name, - (long)(before->st_value - r.r_offset)); + (long long)r.r_offset); } else { - warn("%s - Section mismatch: reference to %s from %s " - "(offset 0x%lx)\n", - modname, secname, fromsec, (long)r.r_offset); + warn("%s - Section mismatch: reference to %s:%s from %s " + "(offset 0x%llx)\n", + modname, secname, fromsec, refsymname, + (long long)r.r_offset); } } @@ -575,6 +604,7 @@ static void check_sec_ref(struct module *mod, const char *modname, const char *secname; r.r_offset = TO_NATIVE(rela->r_offset); r.r_info = TO_NATIVE(rela->r_info); + r.r_addend = TO_NATIVE(rela->r_addend); sym = elf->symtab_start + ELF_R_SYM(r.r_info); /* Skip special sections */ if (sym->st_shndx >= SHN_LORESERVE) |