/* 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 void parse_elf(struct elf_info *info, const char *filename){ unsigned int i; Elf_Ehdr *hdr = info->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)) goto truncated; /* 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) goto truncated; 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; truncated: fatal("%s is truncated.\n", filename);} 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]) {Lines 1–500 of 1488. 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/* 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 void parse_elf(struct elf_info *info, const char *filename) { unsigned int i; Elf_Ehdr *hdr = info->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)) goto truncated; /* 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) goto truncated; 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; truncated: fatal("%s is truncated.\n", filename); } 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]) {