diff options
Diffstat (limited to 'scripts/mod')
-rw-r--r-- | scripts/mod/file2alias.c | 63 | ||||
-rw-r--r-- | scripts/mod/modpost.c | 190 | ||||
-rw-r--r-- | scripts/mod/modpost.h | 43 |
3 files changed, 248 insertions, 48 deletions
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index 220213e603db..88f3f07205f8 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -796,6 +796,51 @@ static int do_platform_entry(const char *filename, return 1; } +static int do_mdio_entry(const char *filename, + struct mdio_device_id *id, char *alias) +{ + int i; + + alias += sprintf(alias, MDIO_MODULE_PREFIX); + + for (i = 0; i < 32; i++) { + if (!((id->phy_id_mask >> (31-i)) & 1)) + *(alias++) = '?'; + else if ((id->phy_id >> (31-i)) & 1) + *(alias++) = '1'; + else + *(alias++) = '0'; + } + + /* Terminate the string */ + *alias = 0; + + return 1; +} + +/* Looks like: zorro:iN. */ +static int do_zorro_entry(const char *filename, struct zorro_device_id *id, + char *alias) +{ + id->id = TO_NATIVE(id->id); + strcpy(alias, "zorro:"); + ADD(alias, "i", id->id != ZORRO_WILDCARD, id->id); + return 1; +} + +/* looks like: "pnp:dD" */ +static int do_isapnp_entry(const char *filename, + struct isapnp_device_id *id, char *alias) +{ + sprintf(alias, "pnp:d%c%c%c%x%x%x%x*", + 'A' + ((id->vendor >> 2) & 0x3f) - 1, + 'A' + (((id->vendor & 3) << 3) | ((id->vendor >> 13) & 7)) - 1, + 'A' + ((id->vendor >> 8) & 0x1f) - 1, + (id->function >> 4) & 0x0f, id->function & 0x0f, + (id->function >> 12) & 0x0f, (id->function >> 8) & 0x0f); + return 1; +} + /* Ignore any prefix, eg. some architectures prepend _ */ static inline int sym_is(const char *symbol, const char *name) { @@ -839,16 +884,16 @@ void handle_moddevtable(struct module *mod, struct elf_info *info, char *zeros = NULL; /* We're looking for a section relative symbol */ - if (!sym->st_shndx || sym->st_shndx >= info->hdr->e_shnum) + if (!sym->st_shndx || get_secindex(info, sym) >= info->num_sections) return; /* Handle all-NULL symbols allocated into .bss */ - if (info->sechdrs[sym->st_shndx].sh_type & SHT_NOBITS) { + if (info->sechdrs[get_secindex(info, sym)].sh_type & SHT_NOBITS) { zeros = calloc(1, sym->st_size); symval = zeros; } else { symval = (void *)info->hdr - + info->sechdrs[sym->st_shndx].sh_offset + + info->sechdrs[get_secindex(info, sym)].sh_offset + sym->st_value; } @@ -943,6 +988,18 @@ void handle_moddevtable(struct module *mod, struct elf_info *info, do_table(symval, sym->st_size, sizeof(struct platform_device_id), "platform", do_platform_entry, mod); + else if (sym_is(symname, "__mod_mdio_device_table")) + do_table(symval, sym->st_size, + sizeof(struct mdio_device_id), "mdio", + do_mdio_entry, mod); + else if (sym_is(symname, "__mod_zorro_device_table")) + do_table(symval, sym->st_size, + sizeof(struct zorro_device_id), "zorro", + do_zorro_entry, mod); + else if (sym_is(symname, "__mod_isapnp_device_table")) + do_table(symval, sym->st_size, + sizeof(struct isapnp_device_id), "isa", + do_isapnp_entry, mod); free(zeros); } diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 3318692e4e76..e8fba959fffb 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -14,6 +14,7 @@ #define _GNU_SOURCE #include <stdio.h> #include <ctype.h> +#include <string.h> #include "modpost.h" #include "../../include/generated/autoconf.h" #include "../../include/linux/license.h" @@ -253,7 +254,7 @@ static enum export export_no(const char *s) return export_unknown; } -static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) +static enum export export_from_sec(struct elf_info *elf, unsigned int sec) { if (sec == elf->export_sec) return export_plain; @@ -373,6 +374,8 @@ static int parse_elf(struct elf_info *info, const char *filename) Elf_Ehdr *hdr; Elf_Shdr *sechdrs; Elf_Sym *sym; + const char *secstrings; + unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; hdr = grab_file(filename, &info->size); if (!hdr) { @@ -417,8 +420,27 @@ static int parse_elf(struct elf_info *info, const char *filename) return 0; } + if (hdr->e_shnum == 0) { + /* + * There are more than 64k sections, + * read count from .sh_size. + * note: it doesn't need shndx2secindex() + */ + info->num_sections = TO_NATIVE(sechdrs[0].sh_size); + } + else { + info->num_sections = hdr->e_shnum; + } + if (hdr->e_shstrndx == SHN_XINDEX) { + info->secindex_strings = + shndx2secindex(TO_NATIVE(sechdrs[0].sh_link)); + } + else { + info->secindex_strings = hdr->e_shstrndx; + } + /* Fix endianness in section headers */ - for (i = 0; i < hdr->e_shnum; i++) { + for (i = 0; i < info->num_sections; i++) { sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); @@ -431,9 +453,8 @@ static int parse_elf(struct elf_info *info, const char *filename) sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); } /* Find symbol table. */ - for (i = 1; i < hdr->e_shnum; i++) { - const char *secstrings - = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; + secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; + for (i = 1; i < info->num_sections; i++) { const char *secname; int nobits = sechdrs[i].sh_type == SHT_NOBITS; @@ -461,14 +482,26 @@ static int parse_elf(struct elf_info *info, const char *filename) else if (strcmp(secname, "__ksymtab_gpl_future") == 0) info->export_gpl_future_sec = i; - if (sechdrs[i].sh_type != SHT_SYMTAB) - continue; + if (sechdrs[i].sh_type == SHT_SYMTAB) { + unsigned int sh_link_idx; + symtab_idx = i; + info->symtab_start = (void *)hdr + + sechdrs[i].sh_offset; + info->symtab_stop = (void *)hdr + + sechdrs[i].sh_offset + sechdrs[i].sh_size; + sh_link_idx = shndx2secindex(sechdrs[i].sh_link); + info->strtab = (void *)hdr + + sechdrs[sh_link_idx].sh_offset; + } - info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; - info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset - + sechdrs[i].sh_size; - info->strtab = (void *)hdr + - sechdrs[sechdrs[i].sh_link].sh_offset; + /* 32bit section no. table? ("more than 64k sections") */ + if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { + symtab_shndx_idx = i; + info->symtab_shndx_start = (void *)hdr + + sechdrs[i].sh_offset; + info->symtab_shndx_stop = (void *)hdr + + sechdrs[i].sh_offset + sechdrs[i].sh_size; + } } if (!info->symtab_start) fatal("%s has no symtab?\n", filename); @@ -480,6 +513,21 @@ static int parse_elf(struct elf_info *info, const char *filename) sym->st_value = TO_NATIVE(sym->st_value); sym->st_size = TO_NATIVE(sym->st_size); } + + if (symtab_shndx_idx != ~0U) { + Elf32_Word *p; + if (symtab_idx != + shndx2secindex(sechdrs[symtab_shndx_idx].sh_link)) + fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", + filename, + shndx2secindex(sechdrs[symtab_shndx_idx].sh_link), + symtab_idx); + /* Fix endianness */ + for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; + p++) + *p = TO_NATIVE(*p); + } + return 1; } @@ -503,6 +551,11 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname) strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) return 1; + if (info->hdr->e_machine == EM_PPC64) + /* Special register function linked on all modules during final link of .ko */ + if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || + strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0) + return 1; /* Do not ignore this symbol */ return 0; } @@ -514,7 +567,7 @@ static void handle_modversions(struct module *mod, struct elf_info *info, Elf_Sym *sym, const char *symname) { unsigned int crc; - enum export export = export_from_sec(info, sym->st_shndx); + enum export export = export_from_sec(info, get_secindex(info, sym)); switch (sym->st_shndx) { case SHN_COMMON: @@ -656,19 +709,19 @@ static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) return "(unknown)"; } -static const char *sec_name(struct elf_info *elf, int shndx) +static const char *sec_name(struct elf_info *elf, int secindex) { Elf_Shdr *sechdrs = elf->sechdrs; return (void *)elf->hdr + - elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + - sechdrs[shndx].sh_name; + elf->sechdrs[elf->secindex_strings].sh_offset + + sechdrs[secindex].sh_name; } static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) { return (void *)elf->hdr + - elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + - sechdr->sh_name; + elf->sechdrs[elf->secindex_strings].sh_offset + + sechdr->sh_name; } /* if sym is empty or point to a string @@ -737,6 +790,8 @@ static const char *section_white_list[] = { ".comment*", ".debug*", + ".zdebug*", /* Compressed debug sections. */ + ".GCC-command-line", /* mn10300 */ ".mdebug*", /* alpha, score, mips etc. */ ".pdr", /* alpha, score, mips etc. */ ".stab*", @@ -981,6 +1036,13 @@ static const struct sectioncheck *section_mismatch( * fromsec = .data* * atsym =__param* * + * Pattern 1a: + * module_param_call() ops can refer to __init set function if permissions=0 + * The pattern is identified by: + * tosec = .init.text + * fromsec = .data* + * atsym = __param_ops_* + * * Pattern 2: * Many drivers utilise a *driver container with references to * add, remove, probe functions etc. @@ -1015,6 +1077,12 @@ static int secref_whitelist(const struct sectioncheck *mismatch, (strncmp(fromsym, "__param", strlen("__param")) == 0)) return 0; + /* Check for pattern 1a */ + if (strcmp(tosec, ".init.text") == 0 && + match(fromsec, data_sections) && + (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) + return 0; + /* Check for pattern 2 */ if (match(tosec, init_exit_sections) && match(fromsec, data_sections) && @@ -1047,11 +1115,14 @@ static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, Elf_Sym *near = NULL; Elf64_Sword distance = 20; Elf64_Sword d; + unsigned int relsym_secindex; if (relsym->st_name != 0) return relsym; + + relsym_secindex = get_secindex(elf, relsym); for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { - if (sym->st_shndx != relsym->st_shndx) + if (get_secindex(elf, sym) != relsym_secindex) continue; if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) continue; @@ -1113,9 +1184,9 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { const char *symsec; - if (sym->st_shndx >= SHN_LORESERVE) + if (is_shndx_special(sym->st_shndx)) continue; - symsec = sec_name(elf, sym->st_shndx); + symsec = sec_name(elf, get_secindex(elf, sym)); if (strcmp(symsec, sec) != 0) continue; if (!is_valid_name(elf, sym)) @@ -1138,6 +1209,9 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, * .cpuinit.data => __cpudata * .memexitconst => __memconst * etc. + * + * The memory of returned value has been allocated on a heap. The user of this + * method should free it after usage. */ static char *sec2annotation(const char *s) { @@ -1160,9 +1234,9 @@ static char *sec2annotation(const char *s) strcat(p, "data "); else strcat(p, " "); - return r; /* we leak her but we do not care */ + return r; } else { - return ""; + return strdup(""); } } @@ -1190,6 +1264,8 @@ static void report_sec_mismatch(const char *modname, { const char *from, *from_p; const char *to, *to_p; + char *prl_from; + char *prl_to; switch (from_is_func) { case 0: from = "variable"; from_p = ""; break; @@ -1213,16 +1289,21 @@ static void report_sec_mismatch(const char *modname, switch (mismatch->mismatch) { case TEXT_TO_ANY_INIT: + prl_from = sec2annotation(fromsec); + prl_to = sec2annotation(tosec); fprintf(stderr, "The function %s%s() references\n" "the %s %s%s%s.\n" "This is often because %s lacks a %s\n" "annotation or the annotation of %s is wrong.\n", - sec2annotation(fromsec), fromsym, - to, sec2annotation(tosec), tosym, to_p, - fromsym, sec2annotation(tosec), tosym); + prl_from, fromsym, + to, prl_to, tosym, to_p, + fromsym, prl_to, tosym); + free(prl_from); + free(prl_to); break; case DATA_TO_ANY_INIT: { + prl_to = sec2annotation(tosec); const char *const *s = mismatch->symbol_white_list; fprintf(stderr, "The variable %s references\n" @@ -1230,20 +1311,24 @@ static void report_sec_mismatch(const char *modname, "If the reference is valid then annotate the\n" "variable with __init* or __refdata (see linux/init.h) " "or name the variable:\n", - fromsym, to, sec2annotation(tosec), tosym, to_p); + fromsym, to, prl_to, tosym, to_p); while (*s) fprintf(stderr, "%s, ", *s++); fprintf(stderr, "\n"); + free(prl_to); break; } case TEXT_TO_ANY_EXIT: + prl_to = sec2annotation(tosec); fprintf(stderr, "The function %s() references a %s in an exit section.\n" "Often the %s %s%s has valid usage outside the exit section\n" "and the fix is to remove the %sannotation of %s.\n", - fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym); + fromsym, to, to, tosym, to_p, prl_to, tosym); + free(prl_to); break; case DATA_TO_ANY_EXIT: { + prl_to = sec2annotation(tosec); const char *const *s = mismatch->symbol_white_list; fprintf(stderr, "The variable %s references\n" @@ -1251,24 +1336,31 @@ static void report_sec_mismatch(const char *modname, "If the reference is valid then annotate the\n" "variable with __exit* (see linux/init.h) or " "name the variable:\n", - fromsym, to, sec2annotation(tosec), tosym, to_p); + fromsym, to, prl_to, tosym, to_p); while (*s) fprintf(stderr, "%s, ", *s++); fprintf(stderr, "\n"); + free(prl_to); break; } case XXXINIT_TO_SOME_INIT: case XXXEXIT_TO_SOME_EXIT: + prl_from = sec2annotation(fromsec); + prl_to = sec2annotation(tosec); fprintf(stderr, "The %s %s%s%s references\n" "a %s %s%s%s.\n" "If %s is only used by %s then\n" "annotate %s with a matching annotation.\n", - from, sec2annotation(fromsec), fromsym, from_p, - to, sec2annotation(tosec), tosym, to_p, + from, prl_from, fromsym, from_p, + to, prl_to, tosym, to_p, tosym, fromsym, tosym); + free(prl_from); + free(prl_to); break; case ANY_INIT_TO_ANY_EXIT: + prl_from = sec2annotation(fromsec); + prl_to = sec2annotation(tosec); fprintf(stderr, "The %s %s%s%s references\n" "a %s %s%s%s.\n" @@ -1277,11 +1369,15 @@ static void report_sec_mismatch(const char *modname, "uses functionality in the exit path.\n" "The fix is often to remove the %sannotation of\n" "%s%s so it may be used outside an exit section.\n", - from, sec2annotation(fromsec), fromsym, from_p, - to, sec2annotation(tosec), tosym, to_p, - sec2annotation(tosec), tosym, to_p); + from, prl_from, fromsym, from_p, + to, prl_to, tosym, to_p, + prl_to, tosym, to_p); + free(prl_from); + free(prl_to); break; case ANY_EXIT_TO_ANY_INIT: + prl_from = sec2annotation(fromsec); + prl_to = sec2annotation(tosec); fprintf(stderr, "The %s %s%s%s references\n" "a %s %s%s%s.\n" @@ -1290,16 +1386,20 @@ static void report_sec_mismatch(const char *modname, "uses functionality in the init path.\n" "The fix is often to remove the %sannotation of\n" "%s%s so it may be used outside an init section.\n", - from, sec2annotation(fromsec), fromsym, from_p, - to, sec2annotation(tosec), tosym, to_p, - sec2annotation(tosec), tosym, to_p); + from, prl_from, fromsym, from_p, + to, prl_to, tosym, to_p, + prl_to, tosym, to_p); + free(prl_from); + free(prl_to); break; case EXPORT_TO_INIT_EXIT: + prl_to = sec2annotation(tosec); fprintf(stderr, "The symbol %s is exported and annotated %s\n" "Fix this by removing the %sannotation of %s " "or drop the export.\n", - tosym, sec2annotation(tosec), sec2annotation(tosec), tosym); + tosym, prl_to, prl_to, tosym); + free(prl_to); break; } fprintf(stderr, "\n"); @@ -1311,7 +1411,7 @@ static void check_section_mismatch(const char *modname, struct elf_info *elf, const char *tosec; const struct sectioncheck *mismatch; - tosec = sec_name(elf, sym->st_shndx); + tosec = sec_name(elf, get_secindex(elf, sym)); mismatch = section_mismatch(fromsec, tosec); if (mismatch) { Elf_Sym *to; @@ -1339,10 +1439,10 @@ static unsigned int *reloc_location(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) { Elf_Shdr *sechdrs = elf->sechdrs; - int section = sechdr->sh_info; + int section = shndx2secindex(sechdr->sh_info); return (void *)elf->hdr + sechdrs[section].sh_offset + - (r->r_offset - sechdrs[section].sh_addr); + r->r_offset; } static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) @@ -1447,7 +1547,7 @@ static void section_rela(const char *modname, struct elf_info *elf, r.r_addend = TO_NATIVE(rela->r_addend); sym = elf->symtab_start + r_sym; /* Skip special sections */ - if (sym->st_shndx >= SHN_LORESERVE) + if (is_shndx_special(sym->st_shndx)) continue; check_section_mismatch(modname, elf, &r, sym, fromsec); } @@ -1505,7 +1605,7 @@ static void section_rel(const char *modname, struct elf_info *elf, } sym = elf->symtab_start + r_sym; /* Skip special sections */ - if (sym->st_shndx >= SHN_LORESERVE) + if (is_shndx_special(sym->st_shndx)) continue; check_section_mismatch(modname, elf, &r, sym, fromsec); } @@ -1515,7 +1615,7 @@ static void section_rel(const char *modname, struct elf_info *elf, * A module includes a number of sections that are discarded * either when loaded or when used as built-in. * For loaded modules all functions marked __init and all data - * marked __initdata will be discarded when the module has been intialized. + * marked __initdata will be discarded when the module has been initialized. * Likewise for modules used built-in the sections marked __exit * are discarded because __exit marked function are supposed to be called * only when a module is unloaded which never happens for built-in modules. @@ -1530,7 +1630,7 @@ static void check_sec_ref(struct module *mod, const char *modname, Elf_Shdr *sechdrs = elf->sechdrs; /* Walk through all sections */ - for (i = 0; i < elf->hdr->e_shnum; i++) { + for (i = 0; i < elf->num_sections; i++) { check_section(modname, elf, &elf->sechdrs[i]); /* We want to process only relocation sections and not .init */ if (sechdrs[i].sh_type == SHT_RELA) diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h index be987a44f250..0388cfccac8d 100644 --- a/scripts/mod/modpost.h +++ b/scripts/mod/modpost.h @@ -129,8 +129,51 @@ struct elf_info { const char *strtab; char *modinfo; unsigned int modinfo_len; + + /* support for 32bit section numbers */ + + unsigned int num_sections; /* max_secindex + 1 */ + unsigned int secindex_strings; + /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, + * take shndx from symtab_shndx_start[N] instead */ + Elf32_Word *symtab_shndx_start; + Elf32_Word *symtab_shndx_stop; }; +static inline int is_shndx_special(unsigned int i) +{ + return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; +} + +/* shndx is in [0..SHN_LORESERVE) U (SHN_HIRESERVE, 0xfffffff], thus: + * shndx == 0 <=> sechdrs[0] + * ...... + * shndx == SHN_LORESERVE-1 <=> sechdrs[SHN_LORESERVE-1] + * shndx == SHN_HIRESERVE+1 <=> sechdrs[SHN_LORESERVE] + * shndx == SHN_HIRESERVE+2 <=> sechdrs[SHN_LORESERVE+1] + * ...... + * fyi: sym->st_shndx is uint16, SHN_LORESERVE = ff00, SHN_HIRESERVE = ffff, + * so basically we map 0000..feff -> 0000..feff + * ff00..ffff -> (you are a bad boy, dont do it) + * 10000..xxxx -> ff00..(xxxx-0x100) + */ +static inline unsigned int shndx2secindex(unsigned int i) +{ + if (i <= SHN_HIRESERVE) + return i; + return i - (SHN_HIRESERVE + 1 - SHN_LORESERVE); +} + +/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ +static inline unsigned int get_secindex(const struct elf_info *info, + const Elf_Sym *sym) +{ + if (sym->st_shndx != SHN_XINDEX) + return sym->st_shndx; + return shndx2secindex(info->symtab_shndx_start[sym - + info->symtab_start]); +} + /* file2alias.c */ extern unsigned int cross_build; void handle_moddevtable(struct module *mod, struct elf_info *info, |