| /* Postprocess module symbol versions |
| * |
| * Copyright 2003 Kai Germaschewski |
| * Copyright 2002-2004 Rusty Russell, IBM Corporation |
| * Copyright 2006 Sam Ravnborg |
| * Based in part on module-init-tools/depmod.c,file2alias |
| * |
| * This software may be used and distributed according to the terms |
| * of the GNU General Public License, incorporated herein by reference. |
| * |
| * Usage: modpost vmlinux module1.o module2.o ... |
| */ |
| |
| #include <ctype.h> |
| #include "modpost.h" |
| #include "../../include/linux/license.h" |
| |
| /* Are we using CONFIG_MODVERSIONS? */ |
| int modversions = 0; |
| /* Warn about undefined symbols? (do so if we have vmlinux) */ |
| int have_vmlinux = 0; |
| /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ |
| static int all_versions = 0; |
| /* If we are modposting external module set to 1 */ |
| static int external_module = 0; |
| /* Only warn about unresolved symbols */ |
| static int warn_unresolved = 0; |
| /* How a symbol is exported */ |
| enum export { |
| export_plain, export_unused, export_gpl, |
| export_unused_gpl, export_gpl_future, export_unknown |
| }; |
| |
| void fatal(const char *fmt, ...) |
| { |
| va_list arglist; |
| |
| fprintf(stderr, "FATAL: "); |
| |
| va_start(arglist, fmt); |
| vfprintf(stderr, fmt, arglist); |
| va_end(arglist); |
| |
| exit(1); |
| } |
| |
| void warn(const char *fmt, ...) |
| { |
| va_list arglist; |
| |
| fprintf(stderr, "WARNING: "); |
| |
| va_start(arglist, fmt); |
| vfprintf(stderr, fmt, arglist); |
| va_end(arglist); |
| } |
| |
| static int is_vmlinux(const char *modname) |
| { |
| const char *myname; |
| |
| if ((myname = strrchr(modname, '/'))) |
| myname++; |
| else |
| myname = modname; |
| |
| return strcmp(myname, "vmlinux") == 0; |
| } |
| |
| void *do_nofail(void *ptr, const char *expr) |
| { |
| if (!ptr) { |
| fatal("modpost: Memory allocation failure: %s.\n", expr); |
| } |
| return ptr; |
| } |
| |
| /* A list of all modules we processed */ |
| |
| static struct module *modules; |
| |
| static struct module *find_module(char *modname) |
| { |
| struct module *mod; |
| |
| for (mod = modules; mod; mod = mod->next) |
| if (strcmp(mod->name, modname) == 0) |
| break; |
| return mod; |
| } |
| |
| static struct module *new_module(char *modname) |
| { |
| struct module *mod; |
| char *p, *s; |
| |
| mod = NOFAIL(malloc(sizeof(*mod))); |
| memset(mod, 0, sizeof(*mod)); |
| p = NOFAIL(strdup(modname)); |
| |
| /* strip trailing .o */ |
| if ((s = strrchr(p, '.')) != NULL) |
| if (strcmp(s, ".o") == 0) |
| *s = '\0'; |
| |
| /* add to list */ |
| mod->name = p; |
| mod->gpl_compatible = -1; |
| mod->next = modules; |
| modules = mod; |
| |
| return mod; |
| } |
| |
| /* A hash of all exported symbols, |
| * struct symbol is also used for lists of unresolved symbols */ |
| |
| #define SYMBOL_HASH_SIZE 1024 |
| |
| struct symbol { |
| struct symbol *next; |
| struct module *module; |
| unsigned int crc; |
| int crc_valid; |
| unsigned int weak:1; |
| unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
| unsigned int kernel:1; /* 1 if symbol is from kernel |
| * (only for external modules) **/ |
| unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
| enum export export; /* Type of export */ |
| char name[0]; |
| }; |
| |
| static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; |
| |
| /* This is based on the hash agorithm from gdbm, via tdb */ |
| static inline unsigned int tdb_hash(const char *name) |
| { |
| unsigned value; /* Used to compute the hash value. */ |
| unsigned i; /* Used to cycle through random values. */ |
| |
| /* Set the initial value from the key size. */ |
| for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) |
| value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
| |
| return (1103515243 * value + 12345); |
| } |
| |
| /** |
| * Allocate a new symbols for use in the hash of exported symbols or |
| * the list of unresolved symbols per module |
| **/ |
| static struct symbol *alloc_symbol(const char *name, unsigned int weak, |
| struct symbol *next) |
| { |
| struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); |
| |
| memset(s, 0, sizeof(*s)); |
| strcpy(s->name, name); |
| s->weak = weak; |
| s->next = next; |
| return s; |
| } |
| |
| /* For the hash of exported symbols */ |
| static struct symbol *new_symbol(const char *name, struct module *module, |
| enum export export) |
| { |
| unsigned int hash; |
| struct symbol *new; |
| |
| hash = tdb_hash(name) % SYMBOL_HASH_SIZE; |
| new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); |
| new->module = module; |
| new->export = export; |
| return new; |
| } |
| |
| static struct symbol *find_symbol(const char *name) |
| { |
| struct symbol *s; |
| |
| /* For our purposes, .foo matches foo. PPC64 needs this. */ |
| if (name[0] == '.') |
| name++; |
| |
| for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { |
| if (strcmp(s->name, name) == 0) |
| return s; |
| } |
| return NULL; |
| } |
| |
| static struct { |
| const char *str; |
| enum export export; |
| } export_list[] = { |
| { .str = "EXPORT_SYMBOL", .export = export_plain }, |
| { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
| { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
| { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
| { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
| { .str = "(unknown)", .export = export_unknown }, |
| }; |
| |
| |
| static const char *export_str(enum export ex) |
| { |
| return export_list[ex].str; |
| } |
| |
| static enum export export_no(const char * s) |
| { |
| int i; |
| if (!s) |
| return export_unknown; |
| for (i = 0; export_list[i].export != export_unknown; i++) { |
| if (strcmp(export_list[i].str, s) == 0) |
| return export_list[i].export; |
| } |
| return export_unknown; |
| } |
| |
| static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) |
| { |
| if (sec == elf->export_sec) |
| return export_plain; |
| else if (sec == elf->export_unused_sec) |
| return export_unused; |
| else if (sec == elf->export_gpl_sec) |
| return export_gpl; |
| else if (sec == elf->export_unused_gpl_sec) |
| return export_unused_gpl; |
| else if (sec == elf->export_gpl_future_sec) |
| return export_gpl_future; |
| else |
| return export_unknown; |
| } |
| |
| /** |
| * Add an exported symbol - it may have already been added without a |
| * CRC, in this case just update the CRC |
| **/ |
| static struct symbol *sym_add_exported(const char *name, struct module *mod, |
| enum export export) |
| { |
| struct symbol *s = find_symbol(name); |
| |
| if (!s) { |
| s = new_symbol(name, mod, export); |
| } else { |
| if (!s->preloaded) { |
| warn("%s: '%s' exported twice. Previous export " |
| "was in %s%s\n", mod->name, name, |
| s->module->name, |
| is_vmlinux(s->module->name) ?"":".ko"); |
| } |
| } |
| s->preloaded = 0; |
| s->vmlinux = is_vmlinux(mod->name); |
| s->kernel = 0; |
| s->export = export; |
| return s; |
| } |
| |
| static void sym_update_crc(const char *name, struct module *mod, |
| unsigned int crc, enum export export) |
| { |
| struct symbol *s = find_symbol(name); |
| |
| if (!s) |
| s = new_symbol(name, mod, export); |
| s->crc = crc; |
| s->crc_valid = 1; |
| } |
| |
| void *grab_file(const char *filename, unsigned long *size) |
| { |
| struct stat st; |
| void *map; |
| int fd; |
| |
| fd = open(filename, O_RDONLY); |
| if (fd < 0 || fstat(fd, &st) != 0) |
| return NULL; |
| |
| *size = st.st_size; |
| map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
| close(fd); |
| |
| if (map == MAP_FAILED) |
| return NULL; |
| return map; |
| } |
| |
| /** |
| * Return a copy of the next line in a mmap'ed file. |
| * spaces in the beginning of the line is trimmed away. |
| * Return a pointer to a static buffer. |
| **/ |
| char* get_next_line(unsigned long *pos, void *file, unsigned long size) |
| { |
| static char line[4096]; |
| int skip = 1; |
| size_t len = 0; |
| signed char *p = (signed char *)file + *pos; |
| char *s = line; |
| |
| for (; *pos < size ; (*pos)++) |
| { |
| if (skip && isspace(*p)) { |
| p++; |
| continue; |
| } |
| skip = 0; |
| if (*p != '\n' && (*pos < size)) { |
| len++; |
| *s++ = *p++; |
| if (len > 4095) |
| break; /* Too long, stop */ |
| } else { |
| /* End of string */ |
| *s = '\0'; |
| return line; |
| } |
| } |
| /* End of buffer */ |
| return NULL; |
| } |
| |
| void release_file(void *file, unsigned long size) |
| { |
| munmap(file, size); |
| } |
| |
| static int parse_elf(struct elf_info *info, const char *filename) |
| { |
| unsigned int i; |
| Elf_Ehdr *hdr; |
| Elf_Shdr *sechdrs; |
| Elf_Sym *sym; |
| |
| hdr = grab_file(filename, &info->size); |
| if (!hdr) { |
| perror(filename); |
| exit(1); |
| } |
| info->hdr = hdr; |
| if (info->size < sizeof(*hdr)) { |
| /* file too small, assume this is an empty .o file */ |
| return 0; |
| } |
| /* Is this a valid ELF file? */ |
| if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || |
| (hdr->e_ident[EI_MAG1] != ELFMAG1) || |
| (hdr->e_ident[EI_MAG2] != ELFMAG2) || |
| (hdr->e_ident[EI_MAG3] != ELFMAG3)) { |
| /* Not an ELF file - silently ignore it */ |
| return 0; |
| } |
| /* Fix endianness in ELF header */ |
| hdr->e_shoff = TO_NATIVE(hdr->e_shoff); |
| hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); |
| hdr->e_shnum = TO_NATIVE(hdr->e_shnum); |
| hdr->e_machine = TO_NATIVE(hdr->e_machine); |
| sechdrs = (void *)hdr + hdr->e_shoff; |
| info->sechdrs = sechdrs; |
| |
| /* Fix endianness in section headers */ |
| for (i = 0; i < hdr->e_shnum; i++) { |
| sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); |
| sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); |
| sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); |
| sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); |
| sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
| } |
| /* Find symbol table. */ |
| for (i = 1; i < hdr->e_shnum; i++) { |
| const char *secstrings |
| = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| const char *secname; |
| |
| if (sechdrs[i].sh_offset > info->size) { |
| fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr)); |
| return 0; |
| } |
| secname = secstrings + sechdrs[i].sh_name; |
| if (strcmp(secname, ".modinfo") == 0) { |
| info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
| info->modinfo_len = sechdrs[i].sh_size; |
| } else if (strcmp(secname, "__ksymtab") == 0) |
| info->export_sec = i; |
| else if (strcmp(secname, "__ksymtab_unused") == 0) |
| info->export_unused_sec = i; |
| else if (strcmp(secname, "__ksymtab_gpl") == 0) |
| info->export_gpl_sec = i; |
| else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
| info->export_unused_gpl_sec = i; |
| else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
| info->export_gpl_future_sec = i; |
| |
| if (sechdrs[i].sh_type != SHT_SYMTAB) |
| continue; |
| |
| 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; |
| } |
| if (!info->symtab_start) { |
| fatal("%s has no symtab?\n", filename); |
| } |
| /* Fix endianness in symbols */ |
| for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { |
| sym->st_shndx = TO_NATIVE(sym->st_shndx); |
| sym->st_name = TO_NATIVE(sym->st_name); |
| sym->st_value = TO_NATIVE(sym->st_value); |
| sym->st_size = TO_NATIVE(sym->st_size); |
| } |
| return 1; |
| } |
| |
| static void parse_elf_finish(struct elf_info *info) |
| { |
| release_file(info->hdr, info->size); |
| } |
| |
| #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
| #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" |
| |
| 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); |
| |
| switch (sym->st_shndx) { |
| case SHN_COMMON: |
| warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
| break; |
| case SHN_ABS: |
| /* CRC'd symbol */ |
| if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
| crc = (unsigned int) sym->st_value; |
| sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
| export); |
| } |
| break; |
| case SHN_UNDEF: |
| /* undefined symbol */ |
| if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && |
| ELF_ST_BIND(sym->st_info) != STB_WEAK) |
| break; |
| /* ignore global offset table */ |
| if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) |
| break; |
| /* ignore __this_module, it will be resolved shortly */ |
| if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) |
| break; |
| /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
| #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) |
| /* add compatibility with older glibc */ |
| #ifndef STT_SPARC_REGISTER |
| #define STT_SPARC_REGISTER STT_REGISTER |
| #endif |
| if (info->hdr->e_machine == EM_SPARC || |
| info->hdr->e_machine == EM_SPARCV9) { |
| /* Ignore register directives. */ |
| if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
| break; |
| if (symname[0] == '.') { |
| char *munged = strdup(symname); |
| munged[0] = '_'; |
| munged[1] = toupper(munged[1]); |
| symname = munged; |
| } |
| } |
| #endif |
| |
| if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
| strlen(MODULE_SYMBOL_PREFIX)) == 0) |
| mod->unres = alloc_symbol(symname + |
| strlen(MODULE_SYMBOL_PREFIX), |
| ELF_ST_BIND(sym->st_info) == STB_WEAK, |
| mod->unres); |
| break; |
| default: |
| /* All exported symbols */ |
| if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
| sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
| export); |
| } |
| if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) |
| mod->has_init = 1; |
| if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) |
| mod->has_cleanup = 1; |
| break; |
| } |
| } |
| |
| /** |
| * Parse tag=value strings from .modinfo section |
| **/ |
| static char *next_string(char *string, unsigned long *secsize) |
| { |
| /* Skip non-zero chars */ |
| while (string[0]) { |
| string++; |
| if ((*secsize)-- <= 1) |
| return NULL; |
| } |
| |
| /* Skip any zero padding. */ |
| while (!string[0]) { |
| string++; |
| if ((*secsize)-- <= 1) |
| return NULL; |
| } |
| return string; |
| } |
| |
| static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
| const char *tag, char *info) |
| { |
| char *p; |
| unsigned int taglen = strlen(tag); |
| unsigned long size = modinfo_len; |
| |
| if (info) { |
| size -= info - (char *)modinfo; |
| modinfo = next_string(info, &size); |
| } |
| |
| for (p = modinfo; p; p = next_string(p, &size)) { |
| if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| return p + taglen + 1; |
| } |
| return NULL; |
| } |
| |
| static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
| const char *tag) |
| |
| { |
| return get_next_modinfo(modinfo, modinfo_len, tag, NULL); |
| } |
| |
| /** |
| * Test if string s ends in string sub |
| * return 0 if match |
| **/ |
| static int strrcmp(const char *s, const char *sub) |
| { |
| int slen, sublen; |
| |
| if (!s || !sub) |
| return 1; |
| |
| slen = strlen(s); |
| sublen = strlen(sub); |
| |
| if ((slen == 0) || (sublen == 0)) |
| return 1; |
| |
| if (sublen > slen) |
| return 1; |
| |
| return memcmp(s + slen - sublen, sub, sublen); |
| } |
| |
| /** |
| * Whitelist to allow certain references to pass with no warning. |
| * Pattern 1: |
| * If a module parameter is declared __initdata and permissions=0 |
| * then this is legal despite the warning generated. |
| * We cannot see value of permissions here, so just ignore |
| * this pattern. |
| * The pattern is identified by: |
| * tosec = .init.data |
| * fromsec = .data* |
| * atsym =__param* |
| * |
| * Pattern 2: |
| * Many drivers utilise a *driver container with references to |
| * add, remove, probe functions etc. |
| * These functions may often be marked __init and we do not want to |
| * warn here. |
| * the pattern is identified by: |
| * tosec = .init.text | .exit.text | .init.data |
| * fromsec = .data |
| * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console |
| * |
| * Pattern 3: |
| * Whitelist all references from .pci_fixup* section to .init.text |
| * This is part of the PCI init when built-in |
| * |
| * Pattern 4: |
| * Whitelist all refereces from .text.head to .init.data |
| * Whitelist all refereces from .text.head to .init.text |
| * |
| * Pattern 5: |
| * Some symbols belong to init section but still it is ok to reference |
| * these from non-init sections as these symbols don't have any memory |
| * allocated for them and symbol address and value are same. So even |
| * if init section is freed, its ok to reference those symbols. |
| * For ex. symbols marking the init section boundaries. |
| * This pattern is identified by |
| * refsymname = __init_begin, _sinittext, _einittext |
| * |
| * Pattern 6: |
| * During the early init phase we have references from .init.text to |
| * .text we have an intended section mismatch - do not warn about it. |
| * See kernel_init() in init/main.c |
| * tosec = .init.text |
| * fromsec = .text |
| * atsym = kernel_init |
| * Some symbols belong to init section but still it is ok to reference |
| **/ |
| static int secref_whitelist(const char *modname, const char *tosec, |
| const char *fromsec, const char *atsym, |
| const char *refsymname) |
| { |
| int f1 = 1, f2 = 1; |
| const char **s; |
| const char *pat2sym[] = { |
| "driver", |
| "_template", /* scsi uses *_template a lot */ |
| "_sht", /* scsi also used *_sht to some extent */ |
| "_ops", |
| "_probe", |
| "_probe_one", |
| "_console", |
| NULL |
| }; |
| |
| const char *pat3refsym[] = { |
| "__init_begin", |
| "_sinittext", |
| "_einittext", |
| NULL |
| }; |
| |
| /* Check for pattern 1 */ |
| if (strcmp(tosec, ".init.data") != 0) |
| f1 = 0; |
| if (strncmp(fromsec, ".data", strlen(".data")) != 0) |
| f1 = 0; |
| if (strncmp(atsym, "__param", strlen("__param")) != 0) |
| f1 = 0; |
| |
| if (f1) |
| return f1; |
| |
| /* Check for pattern 2 */ |
| if ((strcmp(tosec, ".init.text") != 0) && |
| (strcmp(tosec, ".exit.text") != 0) && |
| (strcmp(tosec, ".init.data") != 0)) |
| f2 = 0; |
| if (strcmp(fromsec, ".data") != 0) |
| f2 = 0; |
| |
| for (s = pat2sym; *s; s++) |
| if (strrcmp(atsym, *s) == 0) |
| f1 = 1; |
| if (f1 && f2) |
| return 1; |
| |
| /* Check for pattern 3 */ |
| if ((strncmp(fromsec, ".pci_fixup", strlen(".pci_fixup")) == 0) && |
| (strcmp(tosec, ".init.text") == 0)) |
| return 1; |
| |
| /* Check for pattern 4 */ |
| if ((strcmp(fromsec, ".text.head") == 0) && |
| ((strcmp(tosec, ".init.data") == 0) || |
| (strcmp(tosec, ".init.text") == 0))) |
| return 1; |
| |
| /* Check for pattern 5 */ |
| for (s = pat3refsym; *s; s++) |
| if (strcmp(refsymname, *s) == 0) |
| return 1; |
| |
| /* Check for pattern 6 */ |
| if ((strcmp(tosec, ".init.text") == 0) && |
| (strcmp(fromsec, ".text") == 0) && |
| (strcmp(refsymname, "kernel_init") == 0)) |
| return 1; |
| return 0; |
| } |
| |
| /** |
| * 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; |
| } |
| |
| static inline int is_arm_mapping_symbol(const char *str) |
| { |
| return str[0] == '$' && strchr("atd", str[1]) |
| && (str[2] == '\0' || str[2] == '.'); |
| } |
| |
| /* |
| * If there's no name there, ignore it; likewise, ignore it if it's |
| * one of the magic symbols emitted used by current ARM tools. |
| * |
| * Otherwise if find_symbols_between() returns those symbols, they'll |
| * fail the whitelist tests and cause lots of false alarms ... fixable |
| * only by merging __exit and __init sections into __text, bloating |
| * the kernel (which is especially evil on embedded platforms). |
| */ |
| static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) |
| { |
| const char *name = elf->strtab + sym->st_name; |
| |
| if (!name || !strlen(name)) |
| return 0; |
| return !is_arm_mapping_symbol(name); |
| } |
| |
| /* |
| * Find symbols before or equal addr and after addr - in the section sec. |
| * If we find two symbols with equal offset prefer one with a valid name. |
| * The ELF format may have a better way to detect what type of symbol |
| * it is, but this works for now. |
| **/ |
| static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, |
| const char *sec, |
| Elf_Sym **before, Elf_Sym **after) |
| { |
| Elf_Sym *sym; |
| Elf_Ehdr *hdr = elf->hdr; |
| Elf_Addr beforediff = ~0; |
| Elf_Addr afterdiff = ~0; |
| const char *secstrings = (void *)hdr + |
| elf->sechdrs[hdr->e_shstrndx].sh_offset; |
| |
| *before = NULL; |
| *after = NULL; |
| |
| for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
| const char *symsec; |
| |
| if (sym->st_shndx >= SHN_LORESERVE) |
| continue; |
| symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; |
| if (strcmp(symsec, sec) != 0) |
| continue; |
| if (!is_valid_name(elf, sym)) |
| continue; |
| if (sym->st_value <= addr) { |
| if ((addr - sym->st_value) < beforediff) { |
| beforediff = addr - sym->st_value; |
| *before = sym; |
| } |
| else if ((addr - sym->st_value) == beforediff) { |
| *before = sym; |
| } |
| } |
| else |
| { |
| if ((sym->st_value - addr) < afterdiff) { |
| afterdiff = sym->st_value - addr; |
| *after = sym; |
| } |
| else if ((sym->st_value - addr) == afterdiff) { |
| *after = sym; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Print a warning about a section mismatch. |
| * Try to find symbols near it so user can find it. |
| * Check whitelist before warning - it may be a false positive. |
| **/ |
| static void warn_sec_mismatch(const char *modname, const char *fromsec, |
| struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) |
| { |
| 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 + |
| sechdrs[hdr->e_shstrndx].sh_offset; |
| const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; |
| |
| 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; |
| |
| /* check whitelist - we may ignore it */ |
| if (before && |
| secref_whitelist(modname, secname, fromsec, |
| elf->strtab + before->st_name, refsymname)) |
| return; |
| |
| if (before && after) { |
| 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 long)r.r_offset, |
| elf->strtab + after->st_name); |
| } else if (before) { |
| 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 long)r.r_offset); |
| } else if (after) { |
| warn("%s - Section mismatch: reference to %s:%s from %s " |
| "before '%s' (at offset -0x%llx)\n", |
| modname, secname, refsymname, fromsec, |
| elf->strtab + after->st_name, |
| (long long)r.r_offset); |
| } else { |
| warn("%s - Section mismatch: reference to %s:%s from %s " |
| "(offset 0x%llx)\n", |
| modname, secname, fromsec, refsymname, |
| (long long)r.r_offset); |
| } |
| } |
| |
| /** |
| * 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. |
| * Likewise for modules used built-in the sections marked __exit |
| * are discarded because __exit marked function are supposed to be called |
| * only when a moduel is unloaded which never happes for built-in modules. |
| * The check_sec_ref() function traverses all relocation records |
| * to find all references to a section that reference a section that will |
| * be discarded and warns about it. |
| **/ |
| static void check_sec_ref(struct module *mod, const char *modname, |
| struct elf_info *elf, |
| int section(const char*), |
| 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) { |
| r_sym = ELF64_MIPS_R_SYM(rela->r_info); |
| r_sym = TO_NATIVE(r_sym); |
| } 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) { |
| r_sym = ELF64_MIPS_R_SYM(rel->r_info); |
| r_sym = TO_NATIVE(r_sym); |
| } 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; |
| 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); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Functions used only during module init is marked __init and is stored in |
| * a .init.text section. Likewise data is marked __initdata and stored in |
| * a .init.data section. |
| * If this section is one of these sections return 1 |
| * See include/linux/init.h for the details |
| **/ |
| static int init_section(const char *name) |
| { |
| if (strcmp(name, ".init") == 0) |
| return 1; |
| if (strncmp(name, ".init.", strlen(".init.")) == 0) |
| return 1; |
| return 0; |
| } |
| |
| /** |
| * Identify sections from which references to a .init section is OK. |
| * |
| * Unfortunately references to read only data that referenced .init |
| * sections had to be excluded. Almost all of these are false |
| * positives, they are created by gcc. The downside of excluding rodata |
| * is that there really are some user references from rodata to |
| * init code, e.g. drivers/video/vgacon.c: |
| * |
| * const struct consw vga_con = { |
| * con_startup: vgacon_startup, |
| * |
| * where vgacon_startup is __init. If you want to wade through the false |
| * positives, take out the check for rodata. |
| **/ |
| static int init_section_ref_ok(const char *name) |
| { |
| const char **s; |
| /* Absolute section names */ |
| const char *namelist1[] = { |
| ".init", |
| ".opd", /* see comment [OPD] at exit_section_ref_ok() */ |
| ".toc1", /* used by ppc64 */ |
| ".stab", |
| ".data.rel.ro", /* used by parisc64 */ |
| ".parainstructions", |
| ".text.lock", |
| "__bug_table", /* used by powerpc for BUG() */ |
| ".pci_fixup_header", |
| ".pci_fixup_final", |
| ".pdr", |
| "__param", |
| "__ex_table", |
| ".fixup", |
| ".smp_locks", |
| ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
| "__ftr_fixup", /* powerpc cpu feature fixup */ |
| "__fw_ftr_fixup", /* powerpc firmware feature fixup */ |
| NULL |
| }; |
| /* Start of section names */ |
| const char *namelist2[] = { |
| ".init.", |
| ".altinstructions", |
| ".eh_frame", |
| ".debug", |
| ".parainstructions", |
| ".rodata", |
| NULL |
| }; |
| /* part of section name */ |
| const char *namelist3 [] = { |
| ".unwind", /* sample: IA_64.unwind.init.text */ |
| NULL |
| }; |
| |
| for (s = namelist1; *s; s++) |
| if (strcmp(*s, name) == 0) |
| return 1; |
| for (s = namelist2; *s; s++) |
| if (strncmp(*s, name, strlen(*s)) == 0) |
| return 1; |
| for (s = namelist3; *s; s++) |
| if (strstr(name, *s) != NULL) |
| return 1; |
| if (strrcmp(name, ".init") == 0) |
| return 1; |
| return 0; |
| } |
| |
| /* |
| * Functions used only during module exit is marked __exit and is stored in |
| * a .exit.text section. Likewise data is marked __exitdata and stored in |
| * a .exit.data section. |
| * If this section is one of these sections return 1 |
| * See include/linux/init.h for the details |
| **/ |
| static int exit_section(const char *name) |
| { |
| if (strcmp(name, ".exit.text") == 0) |
| return 1; |
| if (strcmp(name, ".exit.data") == 0) |
| return 1; |
| return 0; |
| |
| } |
| |
| /* |
| * Identify sections from which references to a .exit section is OK. |
| * |
| * [OPD] Keith Ownes <kaos@sgi.com> commented: |
| * For our future {in}sanity, add a comment that this is the ppc .opd |
| * section, not the ia64 .opd section. |
| * ia64 .opd should not point to discarded sections. |
| * [.rodata] like for .init.text we ignore .rodata references -same reason |
| **/ |
| static int exit_section_ref_ok(const char *name) |
| { |
| const char **s; |
| /* Absolute section names */ |
| const char *namelist1[] = { |
| ".exit.text", |
| ".exit.data", |
| ".init.text", |
| ".rodata", |
| ".opd", /* See comment [OPD] */ |
| ".toc1", /* used by ppc64 */ |
| ".altinstructions", |
| ".pdr", |
| "__bug_table", /* used by powerpc for BUG() */ |
| ".exitcall.exit", |
| ".eh_frame", |
| ".parainstructions", |
| ".stab", |
| "__ex_table", |
| ".fixup", |
| ".smp_locks", |
| ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
| NULL |
| }; |
| /* Start of section names */ |
| const char *namelist2[] = { |
| ".debug", |
| NULL |
| }; |
| /* part of section name */ |
| const char *namelist3 [] = { |
| ".unwind", /* Sample: IA_64.unwind.exit.text */ |
| NULL |
| }; |
| |
| for (s = namelist1; *s; s++) |
| if (strcmp(*s, name) == 0) |
| return 1; |
| for (s = namelist2; *s; s++) |
| if (strncmp(*s, name, strlen(*s)) == 0) |
| return 1; |
| for (s = namelist3; *s; s++) |
| if (strstr(name, *s) != NULL) |
| return 1; |
| return 0; |
| } |
| |
| static void read_symbols(char *modname) |
| { |
| const char *symname; |
| char *version; |
| char *license; |
| struct module *mod; |
| struct elf_info info = { }; |
| Elf_Sym *sym; |
| |
| if (!parse_elf(&info, modname)) |
| return; |
| |
| mod = new_module(modname); |
| |
| /* When there's no vmlinux, don't print warnings about |
| * unresolved symbols (since there'll be too many ;) */ |
| if (is_vmlinux(modname)) { |
| have_vmlinux = 1; |
| mod->skip = 1; |
| } |
| |
| license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
| while (license) { |
| if (license_is_gpl_compatible(license)) |
| mod->gpl_compatible = 1; |
| else { |
| mod->gpl_compatible = 0; |
| break; |
| } |
| license = get_next_modinfo(info.modinfo, info.modinfo_len, |
| "license", license); |
| } |
| |
| for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
| symname = info.strtab + sym->st_name; |
| |
| handle_modversions(mod, &info, sym, symname); |
| handle_moddevtable(mod, &info, sym, symname); |
| } |
| check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); |
| check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); |
| |
| version = get_modinfo(info.modinfo, info.modinfo_len, "version"); |
| if (version) |
| maybe_frob_rcs_version(modname, version, info.modinfo, |
| version - (char *)info.hdr); |
| if (version || (all_versions && !is_vmlinux(modname))) |
| get_src_version(modname, mod->srcversion, |
| sizeof(mod->srcversion)-1); |
| |
| parse_elf_finish(&info); |
| |
| /* Our trick to get versioning for struct_module - it's |
| * never passed as an argument to an exported function, so |
| * the automatic versioning doesn't pick it up, but it's really |
| * important anyhow */ |
| if (modversions) |
| mod->unres = alloc_symbol("struct_module", 0, mod->unres); |
| } |
| |
| #define SZ 500 |
| |
| /* We first write the generated file into memory using the |
| * following helper, then compare to the file on disk and |
| * only update the later if anything changed */ |
| |
| void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
| const char *fmt, ...) |
| { |
| char tmp[SZ]; |
| int len; |
| va_list ap; |
| |
| va_start(ap, fmt); |
| len = vsnprintf(tmp, SZ, fmt, ap); |
| buf_write(buf, tmp, len); |
| va_end(ap); |
| } |
| |
| void buf_write(struct buffer *buf, const char *s, int len) |
| { |
| if (buf->size - buf->pos < len) { |
| buf->size += len + SZ; |
| buf->p = realloc(buf->p, buf->size); |
| } |
| strncpy(buf->p + buf->pos, s, len); |
| buf->pos += len; |
| } |
| |
| static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
| { |
| const char *e = is_vmlinux(m) ?"":".ko"; |
| |
| switch (exp) { |
| case export_gpl: |
| fatal("modpost: GPL-incompatible module %s%s " |
| "uses GPL-only symbol '%s'\n", m, e, s); |
| break; |
| case export_unused_gpl: |
| fatal("modpost: GPL-incompatible module %s%s " |
| "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); |
| break; |
| case export_gpl_future: |
| warn("modpost: GPL-incompatible module %s%s " |
| "uses future GPL-only symbol '%s'\n", m, e, s); |
| break; |
| case export_plain: |
| case export_unused: |
| case export_unknown: |
| /* ignore */ |
| break; |
| } |
| } |
| |
| static void check_for_unused(enum export exp, const char* m, const char* s) |
| { |
| const char *e = is_vmlinux(m) ?"":".ko"; |
| |
| switch (exp) { |
| case export_unused: |
| case export_unused_gpl: |
| warn("modpost: module %s%s " |
| "uses symbol '%s' marked UNUSED\n", m, e, s); |
| break; |
| default: |
| /* ignore */ |
| break; |
| } |
| } |
| |
| static void check_exports(struct module *mod) |
| { |
| struct symbol *s, *exp; |
| |
| for (s = mod->unres; s; s = s->next) { |
| const char *basename; |
| exp = find_symbol(s->name); |
| if (!exp || exp->module == mod) |
| continue; |
| basename = strrchr(mod->name, '/'); |
| if (basename) |
| basename++; |
| else |
| basename = mod->name; |
| if (!mod->gpl_compatible) |
| check_for_gpl_usage(exp->export, basename, exp->name); |
| check_for_unused(exp->export, basename, exp->name); |
| } |
| } |
| |
| /** |
| * Header for the generated file |
| **/ |
| static void add_header(struct buffer *b, struct module *mod) |
| { |
| buf_printf(b, "#include <linux/module.h>\n"); |
| buf_printf(b, "#include <linux/vermagic.h>\n"); |
| buf_printf(b, "#include <linux/compiler.h>\n"); |
| buf_printf(b, "\n"); |
| buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); |
| buf_printf(b, "\n"); |
| buf_printf(b, "struct module __this_module\n"); |
| buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); |
| buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
| if (mod->has_init) |
| buf_printf(b, " .init = init_module,\n"); |
| if (mod->has_cleanup) |
| buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" |
| " .exit = cleanup_module,\n" |
| "#endif\n"); |
| buf_printf(b, "};\n"); |
| } |
| |
| /** |
| * Record CRCs for unresolved symbols |
| **/ |
| static int add_versions(struct buffer *b, struct module *mod) |
| { |
| struct symbol *s, *exp; |
| int err = 0; |
| |
| for (s = mod->unres; s; s = s->next) { |
| exp = find_symbol(s->name); |
| if (!exp || exp->module == mod) { |
| if (have_vmlinux && !s->weak) { |
| warn("\"%s\" [%s.ko] undefined!\n", |
| s->name, mod->name); |
| err = warn_unresolved ? 0 : 1; |
| } |
| continue; |
| } |
| s->module = exp->module; |
| s->crc_valid = exp->crc_valid; |
| s->crc = exp->crc; |
| } |
| |
| if (!modversions) |
| return err; |
| |
| buf_printf(b, "\n"); |
| buf_printf(b, "static const struct modversion_info ____versions[]\n"); |
| buf_printf(b, "__attribute_used__\n"); |
| buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
| |
| for (s = mod->unres; s; s = s->next) { |
| if (!s->module) { |
| continue; |
| } |
| if (!s->crc_valid) { |
| warn("\"%s\" [%s.ko] has no CRC!\n", |
| s->name, mod->name); |
| continue; |
| } |
| buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); |
| } |
| |
| buf_printf(b, "};\n"); |
| |
| return err; |
| } |
| |
| static void add_depends(struct buffer *b, struct module *mod, |
| struct module *modules) |
| { |
| struct symbol *s; |
| struct module *m; |
| int first = 1; |
| |
| for (m = modules; m; m = m->next) { |
| m->seen = is_vmlinux(m->name); |
| } |
| |
| buf_printf(b, "\n"); |
| buf_printf(b, "static const char __module_depends[]\n"); |
| buf_printf(b, "__attribute_used__\n"); |
| buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
| buf_printf(b, "\"depends="); |
| for (s = mod->unres; s; s = s->next) { |
| const char *p; |
| if (!s->module) |
| continue; |
| |
| if (s->module->seen) |
| continue; |
| |
| s->module->seen = 1; |
| if ((p = strrchr(s->module->name, '/')) != NULL) |
| p++; |
| else |
| p = s->module->name; |
| buf_printf(b, "%s%s", first ? "" : ",", p); |
| first = 0; |
| } |
| buf_printf(b, "\";\n"); |
| } |
| |
| static void add_srcversion(struct buffer *b, struct module *mod) |
| { |
| if (mod->srcversion[0]) { |
| buf_printf(b, "\n"); |
| buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", |
| mod->srcversion); |
| } |
| } |
| |
| static void write_if_changed(struct buffer *b, const char *fname) |
| { |
| char *tmp; |
| FILE *file; |
| struct stat st; |
| |
| file = fopen(fname, "r"); |
| if (!file) |
| goto write; |
| |
| if (fstat(fileno(file), &st) < 0) |
| goto close_write; |
| |
| if (st.st_size != b->pos) |
| goto close_write; |
| |
| tmp = NOFAIL(malloc(b->pos)); |
| if (fread(tmp, 1, b->pos, file) != b->pos) |
| goto free_write; |
| |
| if (memcmp(tmp, b->p, b->pos) != 0) |
| goto free_write; |
| |
| free(tmp); |
| fclose(file); |
| return; |
| |
| free_write: |
| free(tmp); |
| close_write: |
| fclose(file); |
| write: |
| file = fopen(fname, "w"); |
| if (!file) { |
| perror(fname); |
| exit(1); |
| } |
| if (fwrite(b->p, 1, b->pos, file) != b->pos) { |
| perror(fname); |
| exit(1); |
| } |
| fclose(file); |
| } |
| |
| /* parse Module.symvers file. line format: |
| * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
| **/ |
| static void read_dump(const char *fname, unsigned int kernel) |
| { |
| unsigned long size, pos = 0; |
| void *file = grab_file(fname, &size); |
| char *line; |
| |
| if (!file) |
| /* No symbol versions, silently ignore */ |
| return; |
| |
| while ((line = get_next_line(&pos, file, size))) { |
| char *symname, *modname, *d, *export, *end; |
| unsigned int crc; |
| struct module *mod; |
| struct symbol *s; |
| |
| if (!(symname = strchr(line, '\t'))) |
| goto fail; |
| *symname++ = '\0'; |
| if (!(modname = strchr(symname, '\t'))) |
| goto fail; |
| *modname++ = '\0'; |
| if ((export = strchr(modname, '\t')) != NULL) |
| *export++ = '\0'; |
| if (export && ((end = strchr(export, '\t')) != NULL)) |
| *end = '\0'; |
| crc = strtoul(line, &d, 16); |
| if (*symname == '\0' || *modname == '\0' || *d != '\0') |
| goto fail; |
| |
| if (!(mod = find_module(modname))) { |
| if (is_vmlinux(modname)) { |
| have_vmlinux = 1; |
| } |
| mod = new_module(NOFAIL(strdup(modname))); |
| mod->skip = 1; |
| } |
| s = sym_add_exported(symname, mod, export_no(export)); |
| s->kernel = kernel; |
| s->preloaded = 1; |
| sym_update_crc(symname, mod, crc, export_no(export)); |
| } |
| return; |
| fail: |
| fatal("parse error in symbol dump file\n"); |
| } |
| |
| /* For normal builds always dump all symbols. |
| * For external modules only dump symbols |
| * that are not read from kernel Module.symvers. |
| **/ |
| static int dump_sym(struct symbol *sym) |
| { |
| if (!external_module) |
| return 1; |
| if (sym->vmlinux || sym->kernel) |
| return 0; |
| return 1; |
| } |
| |
| static void write_dump(const char *fname) |
| { |
| struct buffer buf = { }; |
| struct symbol *symbol; |
| int n; |
| |
| for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { |
| symbol = symbolhash[n]; |
| while (symbol) { |
| if (dump_sym(symbol)) |
| buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
| symbol->crc, symbol->name, |
| symbol->module->name, |
| export_str(symbol->export)); |
| symbol = symbol->next; |
| } |
| } |
| write_if_changed(&buf, fname); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| struct module *mod; |
| struct buffer buf = { }; |
| char fname[SZ]; |
| char *kernel_read = NULL, *module_read = NULL; |
| char *dump_write = NULL; |
| int opt; |
| int err; |
| |
| while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) { |
| switch(opt) { |
| case 'i': |
| kernel_read = optarg; |
| break; |
| case 'I': |
| module_read = optarg; |
| external_module = 1; |
| break; |
| case 'm': |
| modversions = 1; |
| break; |
| case 'o': |
| dump_write = optarg; |
| break; |
| case 'a': |
| all_versions = 1; |
| break; |
| case 'w': |
| warn_unresolved = 1; |
| break; |
| default: |
| exit(1); |
| } |
| } |
| |
| if (kernel_read) |
| read_dump(kernel_read, 1); |
| if (module_read) |
| read_dump(module_read, 0); |
| |
| while (optind < argc) { |
| read_symbols(argv[optind++]); |
| } |
| |
| for (mod = modules; mod; mod = mod->next) { |
| if (mod->skip) |
| continue; |
| check_exports(mod); |
| } |
| |
| err = 0; |
| |
| for (mod = modules; mod; mod = mod->next) { |
| if (mod->skip) |
| continue; |
| |
| buf.pos = 0; |
| |
| add_header(&buf, mod); |
| err |= add_versions(&buf, mod); |
| add_depends(&buf, mod, modules); |
| add_moddevtable(&buf, mod); |
| add_srcversion(&buf, mod); |
| |
| sprintf(fname, "%s.mod.c", mod->name); |
| write_if_changed(&buf, fname); |
| } |
| |
| if (dump_write) |
| write_dump(dump_write); |
| |
| return err; |
| } |