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scripts/mod/modpost.c
55.1 KB
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/* Postprocess module symbol versions * * Copyright 2003 Kai Germaschewski * Copyright 2002-2004 Rusty Russell, IBM Corporation |
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* Copyright 2006-2008 Sam Ravnborg |
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* 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 ... */ |
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#define _GNU_SOURCE #include <stdio.h> |
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#include <ctype.h> |
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#include <string.h> |
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#include "modpost.h" |
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#include "../../include/generated/autoconf.h" |
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#include "../../include/linux/license.h" |
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/* Some toolchains use a `_' prefix for all user symbols. */ #ifdef CONFIG_SYMBOL_PREFIX #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX #else #define MODULE_SYMBOL_PREFIX "" #endif |
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/* 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; |
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/* If we are modposting external module set to 1 */ static int external_module = 0; |
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/* Warn about section mismatch in vmlinux if set to 1 */ static int vmlinux_section_warnings = 1; |
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/* Only warn about unresolved symbols */ static int warn_unresolved = 0; |
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/* How a symbol is exported */ |
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static int sec_mismatch_count = 0; static int sec_mismatch_verbose = 1; |
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enum export { export_plain, export_unused, export_gpl, export_unused_gpl, export_gpl_future, export_unknown }; |
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#define PRINTF __attribute__ ((format (printf, 1, 2))) PRINTF void fatal(const char *fmt, ...) |
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{ va_list arglist; fprintf(stderr, "FATAL: "); va_start(arglist, fmt); vfprintf(stderr, fmt, arglist); va_end(arglist); exit(1); } |
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PRINTF void warn(const char *fmt, ...) |
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{ va_list arglist; fprintf(stderr, "WARNING: "); va_start(arglist, fmt); vfprintf(stderr, fmt, arglist); va_end(arglist); } |
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PRINTF void merror(const char *fmt, ...) |
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{ va_list arglist; fprintf(stderr, "ERROR: "); va_start(arglist, fmt); vfprintf(stderr, fmt, arglist); va_end(arglist); } |
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static int is_vmlinux(const char *modname) { const char *myname; |
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myname = strrchr(modname, '/'); if (myname) |
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myname++; else myname = modname; |
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return (strcmp(myname, "vmlinux") == 0) || (strcmp(myname, "vmlinux.o") == 0); |
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} |
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void *do_nofail(void *ptr, const char *expr) { |
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if (!ptr) |
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fatal("modpost: Memory allocation failure: %s. ", expr); |
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return ptr; } /* A list of all modules we processed */ |
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static struct module *modules; |
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static struct module *find_module(char *modname) |
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{ struct module *mod; for (mod = modules; mod; mod = mod->next) if (strcmp(mod->name, modname) == 0) break; return mod; } |
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static struct module *new_module(char *modname) |
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{ struct module *mod; char *p, *s; |
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mod = NOFAIL(malloc(sizeof(*mod))); memset(mod, 0, sizeof(*mod)); p = NOFAIL(strdup(modname)); /* strip trailing .o */ |
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s = strrchr(p, '.'); if (s != NULL) |
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if (strcmp(s, ".o") == 0) *s = '\0'; /* add to list */ mod->name = p; |
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mod->gpl_compatible = -1; |
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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; |
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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) **/ |
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unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
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enum export export; /* Type of export */ |
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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. */ |
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for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
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value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); return (1103515243 * value + 12345); } |
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/** * 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) |
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{ 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 */ |
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static struct symbol *new_symbol(const char *name, struct module *module, enum export export) |
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{ 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; |
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new->export = export; |
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return new; |
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} |
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static struct symbol *find_symbol(const char *name) |
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{ struct symbol *s; /* For our purposes, .foo matches foo. PPC64 needs this. */ if (name[0] == '.') name++; |
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for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
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if (strcmp(s->name, name) == 0) return s; } return NULL; } |
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static struct { const char *str; enum export export; } export_list[] = { { .str = "EXPORT_SYMBOL", .export = export_plain }, |
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{ .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
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{ .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
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{ .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
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{ .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; } |
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static enum export export_no(const char *s) |
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{ int i; |
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if (!s) return export_unknown; |
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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; } |
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static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
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{ if (sec == elf->export_sec) return export_plain; |
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else if (sec == elf->export_unused_sec) return export_unused; |
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else if (sec == elf->export_gpl_sec) return export_gpl; |
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else if (sec == elf->export_unused_gpl_sec) return export_unused_gpl; |
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else if (sec == elf->export_gpl_future_sec) return export_gpl_future; else return export_unknown; } |
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/** * Add an exported symbol - it may have already been added without a * CRC, in this case just update the CRC **/ |
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static struct symbol *sym_add_exported(const char *name, struct module *mod, enum export export) |
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{ struct symbol *s = find_symbol(name); if (!s) { |
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s = new_symbol(name, mod, export); |
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} else { if (!s->preloaded) { |
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warn("%s: '%s' exported twice. Previous export " |
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"was in %s%s ", mod->name, name, s->module->name, is_vmlinux(s->module->name) ?"":".ko"); |
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} else { /* In case Modules.symvers was out of date */ s->module = mod; |
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} |
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} |
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s->preloaded = 0; |
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s->vmlinux = is_vmlinux(mod->name); s->kernel = 0; |
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s->export = export; |
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return s; } static void sym_update_crc(const char *name, struct module *mod, |
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unsigned int crc, enum export export) |
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{ struct symbol *s = find_symbol(name); if (!s) |
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s = new_symbol(name, mod, export); |
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s->crc = crc; s->crc_valid = 1; |
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} |
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void *grab_file(const char *filename, unsigned long *size) |
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{ 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; } |
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/** * 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. **/ |
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char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
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{ static char line[4096]; int skip = 1; size_t len = 0; signed char *p = (signed char *)file + *pos; char *s = line; |
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for (; *pos < size ; (*pos)++) { |
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if (skip && isspace(*p)) { p++; continue; } skip = 0; if (*p != ' ' && (*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; } |
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void release_file(void *file, unsigned long size) |
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{ munmap(file, size); } |
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static int parse_elf(struct elf_info *info, const char *filename) |
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{ unsigned int i; |
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Elf_Ehdr *hdr; |
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Elf_Shdr *sechdrs; Elf_Sym *sym; |
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const char *secstrings; unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; |
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hdr = grab_file(filename, &info->size); if (!hdr) { perror(filename); |
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exit(1); |
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} info->hdr = hdr; |
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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; } |
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/* Fix endianness in ELF header */ |
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hdr->e_type = TO_NATIVE(hdr->e_type); hdr->e_machine = TO_NATIVE(hdr->e_machine); hdr->e_version = TO_NATIVE(hdr->e_version); hdr->e_entry = TO_NATIVE(hdr->e_entry); hdr->e_phoff = TO_NATIVE(hdr->e_phoff); hdr->e_shoff = TO_NATIVE(hdr->e_shoff); hdr->e_flags = TO_NATIVE(hdr->e_flags); hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); hdr->e_phnum = TO_NATIVE(hdr->e_phnum); hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); hdr->e_shnum = TO_NATIVE(hdr->e_shnum); hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); |
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sechdrs = (void *)hdr + hdr->e_shoff; info->sechdrs = sechdrs; |
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/* Check if file offset is correct */ if (hdr->e_shoff > info->size) { |
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fatal("section header offset=%lu in file '%s' is bigger than " "filesize=%lu ", (unsigned long)hdr->e_shoff, filename, info->size); |
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return 0; } |
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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; } |
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/* Fix endianness in section headers */ |
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for (i = 0; i < info->num_sections; i++) { |
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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); sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); 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_info = TO_NATIVE(sechdrs[i].sh_info); sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); |
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} /* Find symbol table. */ |
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secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; for (i = 1; i < info->num_sections; i++) { |
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const char *secname; |
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int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
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if (!nobits && sechdrs[i].sh_offset > info->size) { |
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fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " "sizeof(*hrd)=%zu ", filename, (unsigned long)sechdrs[i].sh_offset, sizeof(*hdr)); |
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return 0; } |
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secname = secstrings + sechdrs[i].sh_name; if (strcmp(secname, ".modinfo") == 0) { |
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if (nobits) fatal("%s has NOBITS .modinfo ", filename); |
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info->modinfo = (void *)hdr + sechdrs[i].sh_offset; info->modinfo_len = sechdrs[i].sh_size; |
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} else if (strcmp(secname, "__ksymtab") == 0) info->export_sec = i; |
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else if (strcmp(secname, "__ksymtab_unused") == 0) info->export_unused_sec = i; |
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else if (strcmp(secname, "__ksymtab_gpl") == 0) info->export_gpl_sec = i; |
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else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) info->export_unused_gpl_sec = i; |
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else if (strcmp(secname, "__ksymtab_gpl_future") == 0) info->export_gpl_future_sec = i; |
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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; } |
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/* 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; } |
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} |
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if (!info->symtab_start) |
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fatal("%s has no symtab? ", filename); |
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/* 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); } |
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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 ", 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); } |
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return 1; |
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} |
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static void parse_elf_finish(struct elf_info *info) |
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{ release_file(info->hdr, info->size); } |
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static int ignore_undef_symbol(struct elf_info *info, const char *symname) { /* ignore __this_module, it will be resolved shortly */ if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) return 1; /* ignore global offset table */ if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) return 1; if (info->hdr->e_machine == EM_PPC) /* Special register function linked on all modules during final link of .ko */ if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) return 1; |
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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; |
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/* Do not ignore this symbol */ return 0; } |
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#define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" |
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541 |
|
5c3ead8c7
|
542 543 |
static void handle_modversions(struct module *mod, struct elf_info *info, Elf_Sym *sym, const char *symname) |
1da177e4c
|
544 545 |
{ unsigned int crc; |
1ce53adf1
|
546 |
enum export export = export_from_sec(info, get_secindex(info, sym)); |
1da177e4c
|
547 548 549 |
switch (sym->st_shndx) { case SHN_COMMON: |
cb80514d9
|
550 551 |
warn("\"%s\" [%s] is COMMON symbol ", symname, mod->name); |
1da177e4c
|
552 553 554 |
break; case SHN_ABS: /* CRC'd symbol */ |
8d99513c1
|
555 |
if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4c
|
556 |
crc = (unsigned int) sym->st_value; |
bd5cbcedf
|
557 558 |
sym_update_crc(symname + strlen(CRC_PFX), mod, crc, export); |
1da177e4c
|
559 560 561 562 563 564 565 |
} break; case SHN_UNDEF: /* undefined symbol */ if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && ELF_ST_BIND(sym->st_info) != STB_WEAK) break; |
4d7365d66
|
566 |
if (ignore_undef_symbol(info, symname)) |
1da177e4c
|
567 |
break; |
8d5290149
|
568 569 570 571 572 573 |
/* 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 |
1da177e4c
|
574 575 576 |
if (info->hdr->e_machine == EM_SPARC || info->hdr->e_machine == EM_SPARCV9) { /* Ignore register directives. */ |
8d5290149
|
577 |
if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4c
|
578 |
break; |
62070fa42
|
579 580 581 582 583 584 |
if (symname[0] == '.') { char *munged = strdup(symname); munged[0] = '_'; munged[1] = toupper(munged[1]); symname = munged; } |
1da177e4c
|
585 586 |
} #endif |
62070fa42
|
587 |
|
1da177e4c
|
588 |
if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
df578e7d8
|
589 590 591 592 593 594 595 |
strlen(MODULE_SYMBOL_PREFIX)) == 0) { mod->unres = alloc_symbol(symname + strlen(MODULE_SYMBOL_PREFIX), ELF_ST_BIND(sym->st_info) == STB_WEAK, mod->unres); } |
1da177e4c
|
596 597 598 |
break; default: /* All exported symbols */ |
8d99513c1
|
599 |
if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbcedf
|
600 601 |
sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, export); |
1da177e4c
|
602 603 604 605 606 607 608 609 |
} 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; } } |
5c3ead8c7
|
610 611 612 |
/** * Parse tag=value strings from .modinfo section **/ |
1da177e4c
|
613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 |
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; } |
b817f6fef
|
630 631 |
static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, const char *tag, char *info) |
1da177e4c
|
632 633 634 635 |
{ char *p; unsigned int taglen = strlen(tag); unsigned long size = modinfo_len; |
b817f6fef
|
636 637 638 639 |
if (info) { size -= info - (char *)modinfo; modinfo = next_string(info, &size); } |
1da177e4c
|
640 641 642 643 644 645 |
for (p = modinfo; p; p = next_string(p, &size)) { if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') return p + taglen + 1; } return NULL; } |
b817f6fef
|
646 647 648 649 650 651 |
static char *get_modinfo(void *modinfo, unsigned long modinfo_len, const char *tag) { return get_next_modinfo(modinfo, modinfo_len, tag, NULL); } |
93684d3b8
|
652 |
/** |
4c8fbca58
|
653 654 655 656 657 |
* Test if string s ends in string sub * return 0 if match **/ static int strrcmp(const char *s, const char *sub) { |
df578e7d8
|
658 |
int slen, sublen; |
62070fa42
|
659 |
|
4c8fbca58
|
660 661 |
if (!s || !sub) return 1; |
62070fa42
|
662 |
|
4c8fbca58
|
663 |
slen = strlen(s); |
df578e7d8
|
664 |
sublen = strlen(sub); |
62070fa42
|
665 |
|
4c8fbca58
|
666 667 |
if ((slen == 0) || (sublen == 0)) return 1; |
df578e7d8
|
668 669 |
if (sublen > slen) return 1; |
4c8fbca58
|
670 |
|
df578e7d8
|
671 |
return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca58
|
672 |
} |
ff13f9269
|
673 674 |
static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) { |
58fb0d4f2
|
675 676 677 |
if (sym) return elf->strtab + sym->st_name; else |
f666751a0
|
678 |
return "(unknown)"; |
ff13f9269
|
679 |
} |
1ce53adf1
|
680 |
static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f9269
|
681 682 683 |
{ Elf_Shdr *sechdrs = elf->sechdrs; return (void *)elf->hdr + |
1ce53adf1
|
684 685 |
elf->sechdrs[elf->secindex_strings].sh_offset + sechdrs[secindex].sh_name; |
ff13f9269
|
686 687 688 689 690 |
} static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) { return (void *)elf->hdr + |
1ce53adf1
|
691 692 |
elf->sechdrs[elf->secindex_strings].sh_offset + sechdr->sh_name; |
ff13f9269
|
693 |
} |
10668220a
|
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 |
/* if sym is empty or point to a string * like ".[0-9]+" then return 1. * This is the optional prefix added by ld to some sections */ static int number_prefix(const char *sym) { if (*sym++ == '\0') return 1; if (*sym != '.') return 0; do { char c = *sym++; if (c < '0' || c > '9') return 0; } while (*sym); return 1; } /* The pattern is an array of simple patterns. * "foo" will match an exact string equal to "foo" |
6c5bd235b
|
714 |
* "*foo" will match a string that ends with "foo" |
10668220a
|
715 716 717 718 719 720 |
* "foo*" will match a string that begins with "foo" * "foo$" will match a string equal to "foo" or "foo.1" * where the '1' can be any number including several digits. * The $ syntax is for sections where ld append a dot number * to make section name unique. */ |
5c7251384
|
721 |
static int match(const char *sym, const char * const pat[]) |
10668220a
|
722 723 724 725 726 |
{ const char *p; while (*pat) { p = *pat++; const char *endp = p + strlen(p) - 1; |
6c5bd235b
|
727 728 729 730 731 |
/* "*foo" */ if (*p == '*') { if (strrcmp(sym, p + 1) == 0) return 1; } |
10668220a
|
732 |
/* "foo*" */ |
6c5bd235b
|
733 |
else if (*endp == '*') { |
10668220a
|
734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 |
if (strncmp(sym, p, strlen(p) - 1) == 0) return 1; } /* "foo$" */ else if (*endp == '$') { if (strncmp(sym, p, strlen(p) - 1) == 0) { if (number_prefix(sym + strlen(p) - 1)) return 1; } } /* no wildcards */ else { if (strcmp(p, sym) == 0) return 1; } } /* no match */ return 0; } |
10668220a
|
753 754 |
/* sections that we do not want to do full section mismatch check on */ static const char *section_white_list[] = |
4391ed6aa
|
755 756 757 |
{ ".comment*", ".debug*", |
019fca84e
|
758 |
".GCC-command-line", /* mn10300 */ |
4391ed6aa
|
759 760 761 762 763 764 765 766 |
".mdebug*", /* alpha, score, mips etc. */ ".pdr", /* alpha, score, mips etc. */ ".stab*", ".note*", ".got*", ".toc*", NULL }; |
10668220a
|
767 |
|
e241a6303
|
768 |
/* |
b614a697d
|
769 |
* This is used to find sections missing the SHF_ALLOC flag. |
e241a6303
|
770 |
* The cause of this is often a section specified in assembler |
b614a697d
|
771 |
* without "ax" / "aw". |
e241a6303
|
772 |
*/ |
b614a697d
|
773 774 |
static void check_section(const char *modname, struct elf_info *elf, Elf_Shdr *sechdr) |
e241a6303
|
775 |
{ |
b614a697d
|
776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 |
const char *sec = sech_name(elf, sechdr); if (sechdr->sh_type == SHT_PROGBITS && !(sechdr->sh_flags & SHF_ALLOC) && !match(sec, section_white_list)) { warn("%s (%s): unexpected non-allocatable section. " "Did you forget to use \"ax\"/\"aw\" in a .S file? " "Note that for example <linux/init.h> contains " "section definitions for use in .S files. ", modname, sec); |
e241a6303
|
791 |
} |
e241a6303
|
792 |
} |
eb8f68904
|
793 |
#define ALL_INIT_DATA_SECTIONS \ |
fd6c3a8dc
|
794 795 |
".init.setup$", ".init.rodata$", \ ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \ |
eb8f68904
|
796 797 798 |
".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" #define ALL_EXIT_DATA_SECTIONS \ ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" |
10668220a
|
799 |
|
eb8f68904
|
800 801 802 803 |
#define ALL_INIT_TEXT_SECTIONS \ ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" #define ALL_EXIT_TEXT_SECTIONS \ ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" |
10668220a
|
804 |
|
4a31a229f
|
805 806 807 808 809 810 811 |
#define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \ MEM_INIT_SECTIONS #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \ MEM_EXIT_SECTIONS #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS |
10668220a
|
812 |
|
6c5bd235b
|
813 |
#define DATA_SECTIONS ".data$", ".data.rel$" |
10668220a
|
814 |
#define TEXT_SECTIONS ".text$" |
fd6c3a8dc
|
815 816 817 818 |
#define INIT_SECTIONS ".init.*" #define DEV_INIT_SECTIONS ".devinit.*" #define CPU_INIT_SECTIONS ".cpuinit.*" #define MEM_INIT_SECTIONS ".meminit.*" |
eb8f68904
|
819 |
|
fd6c3a8dc
|
820 821 822 823 |
#define EXIT_SECTIONS ".exit.*" #define DEV_EXIT_SECTIONS ".devexit.*" #define CPU_EXIT_SECTIONS ".cpuexit.*" #define MEM_EXIT_SECTIONS ".memexit.*" |
eb8f68904
|
824 |
|
6c5bd235b
|
825 |
/* init data sections */ |
eb8f68904
|
826 |
static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235b
|
827 828 |
/* all init sections */ |
eb8f68904
|
829 |
static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235b
|
830 831 832 |
/* All init and exit sections (code + data) */ static const char *init_exit_sections[] = |
eb8f68904
|
833 |
{ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235b
|
834 835 836 |
/* data section */ static const char *data_sections[] = { DATA_SECTIONS, NULL }; |
6c5bd235b
|
837 838 |
/* symbols in .data that may refer to init/exit sections */ |
af92a82d0
|
839 840 841 842 843 844 845 846 847 |
#define DEFAULT_SYMBOL_WHITE_LIST \ "*driver", \ "*_template", /* scsi uses *_template a lot */ \ "*_timer", /* arm uses ops structures named _timer a lot */ \ "*_sht", /* scsi also used *_sht to some extent */ \ "*_ops", \ "*_probe", \ "*_probe_one", \ "*_console" |
6c5bd235b
|
848 849 850 851 |
static const char *head_sections[] = { ".head.text*", NULL }; static const char *linker_symbols[] = { "__init_begin", "_sinittext", "_einittext", NULL }; |
588ccd732
|
852 |
enum mismatch { |
bbd3f4fb8
|
853 854 855 856 857 858 859 860 |
TEXT_TO_ANY_INIT, DATA_TO_ANY_INIT, TEXT_TO_ANY_EXIT, DATA_TO_ANY_EXIT, XXXINIT_TO_SOME_INIT, XXXEXIT_TO_SOME_EXIT, ANY_INIT_TO_ANY_EXIT, ANY_EXIT_TO_ANY_INIT, |
588ccd732
|
861 862 |
EXPORT_TO_INIT_EXIT, }; |
10668220a
|
863 864 865 |
struct sectioncheck { const char *fromsec[20]; const char *tosec[20]; |
588ccd732
|
866 |
enum mismatch mismatch; |
af92a82d0
|
867 |
const char *symbol_white_list[20]; |
10668220a
|
868 869 870 871 872 873 874 |
}; const struct sectioncheck sectioncheck[] = { /* Do not reference init/exit code/data from * normal code and data */ { |
588ccd732
|
875 876 |
.fromsec = { TEXT_SECTIONS, NULL }, .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
877 |
.mismatch = TEXT_TO_ANY_INIT, |
af92a82d0
|
878 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd732
|
879 880 881 |
}, { .fromsec = { DATA_SECTIONS, NULL }, |
0db252452
|
882 |
.tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb8
|
883 |
.mismatch = DATA_TO_ANY_INIT, |
af92a82d0
|
884 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd732
|
885 886 |
}, { |
0db252452
|
887 888 889 890 891 892 893 894 895 |
.fromsec = { DATA_SECTIONS, NULL }, .tosec = { INIT_SECTIONS, NULL }, .mismatch = DATA_TO_ANY_INIT, .symbol_white_list = { "*_template", "*_timer", "*_sht", "*_ops", "*_probe", "*_probe_one", "*_console", NULL }, }, { |
588ccd732
|
896 897 |
.fromsec = { TEXT_SECTIONS, NULL }, .tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
898 |
.mismatch = TEXT_TO_ANY_EXIT, |
af92a82d0
|
899 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd732
|
900 901 902 903 |
}, { .fromsec = { DATA_SECTIONS, NULL }, .tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
904 |
.mismatch = DATA_TO_ANY_EXIT, |
af92a82d0
|
905 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f68904
|
906 907 908 |
}, /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ { |
4a31a229f
|
909 |
.fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd732
|
910 |
.tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
911 |
.mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d0
|
912 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f68904
|
913 |
}, |
fd6c3a8dc
|
914 915 916 917 |
/* Do not reference cpuinit code/data from meminit code/data */ { .fromsec = { MEM_INIT_SECTIONS, NULL }, .tosec = { CPU_INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
918 |
.mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d0
|
919 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8dc
|
920 921 922 923 924 |
}, /* Do not reference meminit code/data from cpuinit code/data */ { .fromsec = { CPU_INIT_SECTIONS, NULL }, .tosec = { MEM_INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
925 |
.mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d0
|
926 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8dc
|
927 |
}, |
eb8f68904
|
928 929 |
/* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ { |
4a31a229f
|
930 |
.fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd732
|
931 |
.tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
932 |
.mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d0
|
933 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220a
|
934 |
}, |
fd6c3a8dc
|
935 936 937 938 |
/* Do not reference cpuexit code/data from memexit code/data */ { .fromsec = { MEM_EXIT_SECTIONS, NULL }, .tosec = { CPU_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
939 |
.mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d0
|
940 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8dc
|
941 942 943 944 945 |
}, /* Do not reference memexit code/data from cpuexit code/data */ { .fromsec = { CPU_EXIT_SECTIONS, NULL }, .tosec = { MEM_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
946 |
.mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d0
|
947 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8dc
|
948 |
}, |
10668220a
|
949 950 |
/* Do not use exit code/data from init code */ { |
eb8f68904
|
951 952 |
.fromsec = { ALL_INIT_SECTIONS, NULL }, .tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
953 |
.mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d0
|
954 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220a
|
955 956 957 |
}, /* Do not use init code/data from exit code */ { |
eb8f68904
|
958 |
.fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd732
|
959 |
.tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
960 |
.mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d0
|
961 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220a
|
962 963 964 965 |
}, /* Do not export init/exit functions or data */ { .fromsec = { "__ksymtab*", NULL }, |
fa95eb1f1
|
966 |
.tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d0
|
967 968 |
.mismatch = EXPORT_TO_INIT_EXIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220a
|
969 970 |
} }; |
0d2a636ee
|
971 972 |
static const struct sectioncheck *section_mismatch( const char *fromsec, const char *tosec) |
10668220a
|
973 974 975 976 977 978 979 980 |
{ int i; int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); const struct sectioncheck *check = §ioncheck[0]; for (i = 0; i < elems; i++) { if (match(fromsec, check->fromsec) && match(tosec, check->tosec)) |
0d2a636ee
|
981 |
return check; |
10668220a
|
982 983 |
check++; } |
0d2a636ee
|
984 |
return NULL; |
10668220a
|
985 |
} |
4c8fbca58
|
986 987 |
/** * Whitelist to allow certain references to pass with no warning. |
0e0d314e6
|
988 |
* |
4c8fbca58
|
989 990 991 992 993 994 995 |
* 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 |
9209aed07
|
996 |
* fromsec = .data* |
4c8fbca58
|
997 |
* atsym =__param* |
62070fa42
|
998 |
* |
6a841528d
|
999 1000 1001 1002 1003 1004 1005 |
* 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_* * |
4c8fbca58
|
1006 |
* Pattern 2: |
72ee59b57
|
1007 |
* Many drivers utilise a *driver container with references to |
4c8fbca58
|
1008 |
* add, remove, probe functions etc. |
b75dcabd6
|
1009 |
* These functions may often be marked __devinit and we do not want to |
4c8fbca58
|
1010 1011 |
* warn here. * the pattern is identified by: |
83cda2bb3
|
1012 1013 |
* tosec = init or exit section * fromsec = data section |
df578e7d8
|
1014 1015 |
* atsym = *driver, *_template, *_sht, *_ops, *_probe, * *probe_one, *_console, *_timer |
ee6a8545a
|
1016 1017 |
* * Pattern 3: |
c993971f4
|
1018 |
* Whitelist all references from .head.text to any init section |
9bf8cb9b7
|
1019 |
* |
1d8af559f
|
1020 |
* Pattern 4: |
ee6a8545a
|
1021 1022 1023 1024 1025 1026 1027 |
* 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 |
9bf8cb9b7
|
1028 |
* |
4c8fbca58
|
1029 |
**/ |
af92a82d0
|
1030 1031 |
static int secref_whitelist(const struct sectioncheck *mismatch, const char *fromsec, const char *fromsym, |
58fb0d4f2
|
1032 |
const char *tosec, const char *tosym) |
4c8fbca58
|
1033 |
{ |
4c8fbca58
|
1034 |
/* Check for pattern 1 */ |
6c5bd235b
|
1035 1036 |
if (match(tosec, init_data_sections) && match(fromsec, data_sections) && |
58fb0d4f2
|
1037 1038 |
(strncmp(fromsym, "__param", strlen("__param")) == 0)) return 0; |
4c8fbca58
|
1039 |
|
6a841528d
|
1040 1041 1042 1043 1044 |
/* Check for pattern 1a */ if (strcmp(tosec, ".init.text") == 0 && match(fromsec, data_sections) && (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) return 0; |
4c8fbca58
|
1045 |
/* Check for pattern 2 */ |
6c5bd235b
|
1046 1047 |
if (match(tosec, init_exit_sections) && match(fromsec, data_sections) && |
af92a82d0
|
1048 |
match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f2
|
1049 |
return 0; |
4c8fbca58
|
1050 |
|
9bf8cb9b7
|
1051 |
/* Check for pattern 3 */ |
6c5bd235b
|
1052 1053 |
if (match(fromsec, head_sections) && match(tosec, init_sections)) |
58fb0d4f2
|
1054 |
return 0; |
9bf8cb9b7
|
1055 |
|
1d8af559f
|
1056 |
/* Check for pattern 4 */ |
58fb0d4f2
|
1057 1058 |
if (match(tosym, linker_symbols)) return 0; |
9bf8cb9b7
|
1059 |
|
58fb0d4f2
|
1060 |
return 1; |
4c8fbca58
|
1061 1062 1063 |
} /** |
93684d3b8
|
1064 1065 1066 1067 1068 1069 |
* 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. * **/ |
9ad21c3f3
|
1070 |
static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b8
|
1071 1072 1073 |
Elf_Sym *relsym) { Elf_Sym *sym; |
9ad21c3f3
|
1074 1075 1076 |
Elf_Sym *near = NULL; Elf64_Sword distance = 20; Elf64_Sword d; |
1ce53adf1
|
1077 |
unsigned int relsym_secindex; |
93684d3b8
|
1078 1079 1080 |
if (relsym->st_name != 0) return relsym; |
1ce53adf1
|
1081 1082 |
relsym_secindex = get_secindex(elf, relsym); |
93684d3b8
|
1083 |
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf1
|
1084 |
if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b8
|
1085 |
continue; |
ae4ac1232
|
1086 1087 |
if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) continue; |
93684d3b8
|
1088 1089 |
if (sym->st_value == addr) return sym; |
9ad21c3f3
|
1090 1091 1092 1093 1094 1095 1096 1097 |
/* Find a symbol nearby - addr are maybe negative */ d = sym->st_value - addr; if (d < 0) d = addr - sym->st_value; if (d < distance) { distance = d; near = sym; } |
93684d3b8
|
1098 |
} |
9ad21c3f3
|
1099 1100 1101 1102 1103 |
/* We need a close match */ if (distance < 20) return near; else return NULL; |
93684d3b8
|
1104 |
} |
da68d61f8
|
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 |
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); } |
b39927cf4
|
1128 |
/* |
43c74d179
|
1129 1130 1131 1132 |
* 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. |
b39927cf4
|
1133 |
**/ |
157c23c80
|
1134 1135 |
static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, const char *sec) |
b39927cf4
|
1136 1137 |
{ Elf_Sym *sym; |
157c23c80
|
1138 |
Elf_Sym *near = NULL; |
157c23c80
|
1139 |
Elf_Addr distance = ~0; |
62070fa42
|
1140 |
|
b39927cf4
|
1141 1142 |
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { const char *symsec; |
1ce53adf1
|
1143 |
if (is_shndx_special(sym->st_shndx)) |
b39927cf4
|
1144 |
continue; |
1ce53adf1
|
1145 |
symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf4
|
1146 1147 |
if (strcmp(symsec, sec) != 0) continue; |
da68d61f8
|
1148 1149 |
if (!is_valid_name(elf, sym)) continue; |
b39927cf4
|
1150 |
if (sym->st_value <= addr) { |
157c23c80
|
1151 1152 1153 1154 1155 |
if ((addr - sym->st_value) < distance) { distance = addr - sym->st_value; near = sym; } else if ((addr - sym->st_value) == distance) { near = sym; |
43c74d179
|
1156 |
} |
b39927cf4
|
1157 1158 |
} } |
157c23c80
|
1159 |
return near; |
b39927cf4
|
1160 |
} |
58fb0d4f2
|
1161 |
/* |
588ccd732
|
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 |
* Convert a section name to the function/data attribute * .init.text => __init * .cpuinit.data => __cpudata * .memexitconst => __memconst * etc. */ static char *sec2annotation(const char *s) { if (match(s, init_exit_sections)) { char *p = malloc(20); char *r = p; *p++ = '_'; *p++ = '_'; if (*s == '.') s++; while (*s && *s != '.') *p++ = *s++; *p = '\0'; if (*s == '.') s++; if (strstr(s, "rodata") != NULL) strcat(p, "const "); else if (strstr(s, "data") != NULL) strcat(p, "data "); else strcat(p, " "); return r; /* we leak her but we do not care */ } else { |
5003bab82
|
1191 |
return strdup(""); |
588ccd732
|
1192 1193 1194 1195 1196 1197 1198 1199 |
} } static int is_function(Elf_Sym *sym) { if (sym) return ELF_ST_TYPE(sym->st_info) == STT_FUNC; else |
f666751a0
|
1200 |
return -1; |
588ccd732
|
1201 1202 1203 |
} /* |
b39927cf4
|
1204 1205 |
* Print a warning about a section mismatch. * Try to find symbols near it so user can find it. |
4c8fbca58
|
1206 |
* Check whitelist before warning - it may be a false positive. |
58fb0d4f2
|
1207 |
*/ |
0d2a636ee
|
1208 1209 |
static void report_sec_mismatch(const char *modname, const struct sectioncheck *mismatch, |
58fb0d4f2
|
1210 1211 1212 |
const char *fromsec, unsigned long long fromaddr, const char *fromsym, |
588ccd732
|
1213 1214 1215 1216 1217 1218 |
int from_is_func, const char *tosec, const char *tosym, int to_is_func) { const char *from, *from_p; const char *to, *to_p; |
37ed19d5c
|
1219 1220 |
char *prl_from; char *prl_to; |
f666751a0
|
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 |
switch (from_is_func) { case 0: from = "variable"; from_p = ""; break; case 1: from = "function"; from_p = "()"; break; default: from = "(unknown reference)"; from_p = ""; break; } switch (to_is_func) { case 0: to = "variable"; to_p = ""; break; case 1: to = "function"; to_p = "()"; break; default: to = "(unknown reference)"; to_p = ""; break; } |
588ccd732
|
1232 |
|
e5f95c8b7
|
1233 1234 1235 |
sec_mismatch_count++; if (!sec_mismatch_verbose) return; |
7c0ac495e
|
1236 1237 1238 1239 1240 |
warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " "to the %s %s:%s%s ", modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, tosym, to_p); |
588ccd732
|
1241 |
|
0d2a636ee
|
1242 |
switch (mismatch->mismatch) { |
bbd3f4fb8
|
1243 |
case TEXT_TO_ANY_INIT: |
37ed19d5c
|
1244 1245 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1246 |
fprintf(stderr, |
f666751a0
|
1247 1248 |
"The function %s%s() references " |
588ccd732
|
1249 1250 1251 1252 1253 1254 |
"the %s %s%s%s. " "This is often because %s lacks a %s " "annotation or the annotation of %s is wrong. ", |
37ed19d5c
|
1255 1256 1257 1258 1259 |
prl_from, fromsym, to, prl_to, tosym, to_p, fromsym, prl_to, tosym); free(prl_from); free(prl_to); |
588ccd732
|
1260 |
break; |
bbd3f4fb8
|
1261 |
case DATA_TO_ANY_INIT: { |
37ed19d5c
|
1262 |
prl_to = sec2annotation(tosec); |
af92a82d0
|
1263 |
const char *const *s = mismatch->symbol_white_list; |
588ccd732
|
1264 1265 1266 1267 1268 1269 1270 |
fprintf(stderr, "The variable %s references " "the %s %s%s%s " "If the reference is valid then annotate the " |
8b8b76c04
|
1271 |
"variable with __init* or __refdata (see linux/init.h) " |
588ccd732
|
1272 1273 |
"or name the variable: ", |
37ed19d5c
|
1274 |
fromsym, to, prl_to, tosym, to_p); |
588ccd732
|
1275 1276 1277 1278 |
while (*s) fprintf(stderr, "%s, ", *s++); fprintf(stderr, " "); |
37ed19d5c
|
1279 |
free(prl_to); |
588ccd732
|
1280 |
break; |
58fb0d4f2
|
1281 |
} |
bbd3f4fb8
|
1282 |
case TEXT_TO_ANY_EXIT: |
37ed19d5c
|
1283 |
prl_to = sec2annotation(tosec); |
588ccd732
|
1284 1285 1286 1287 1288 1289 1290 |
fprintf(stderr, "The function %s() references a %s in an exit section. " "Often the %s %s%s has valid usage outside the exit section " "and the fix is to remove the %sannotation of %s. ", |
37ed19d5c
|
1291 1292 |
fromsym, to, to, tosym, to_p, prl_to, tosym); free(prl_to); |
588ccd732
|
1293 |
break; |
bbd3f4fb8
|
1294 |
case DATA_TO_ANY_EXIT: { |
37ed19d5c
|
1295 |
prl_to = sec2annotation(tosec); |
af92a82d0
|
1296 |
const char *const *s = mismatch->symbol_white_list; |
588ccd732
|
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 |
fprintf(stderr, "The variable %s references " "the %s %s%s%s " "If the reference is valid then annotate the " "variable with __exit* (see linux/init.h) or " "name the variable: ", |
37ed19d5c
|
1307 |
fromsym, to, prl_to, tosym, to_p); |
588ccd732
|
1308 1309 1310 1311 |
while (*s) fprintf(stderr, "%s, ", *s++); fprintf(stderr, " "); |
37ed19d5c
|
1312 |
free(prl_to); |
588ccd732
|
1313 1314 |
break; } |
bbd3f4fb8
|
1315 1316 |
case XXXINIT_TO_SOME_INIT: case XXXEXIT_TO_SOME_EXIT: |
37ed19d5c
|
1317 1318 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1319 1320 1321 1322 1323 1324 1325 1326 1327 |
fprintf(stderr, "The %s %s%s%s references " "a %s %s%s%s. " "If %s is only used by %s then " "annotate %s with a matching annotation. ", |
37ed19d5c
|
1328 1329 |
from, prl_from, fromsym, from_p, to, prl_to, tosym, to_p, |
b1d2675a6
|
1330 |
tosym, fromsym, tosym); |
37ed19d5c
|
1331 1332 |
free(prl_from); free(prl_to); |
588ccd732
|
1333 |
break; |
bbd3f4fb8
|
1334 |
case ANY_INIT_TO_ANY_EXIT: |
37ed19d5c
|
1335 1336 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 |
fprintf(stderr, "The %s %s%s%s references " "a %s %s%s%s. " "This is often seen when error handling " "in the init function " "uses functionality in the exit path. " "The fix is often to remove the %sannotation of " "%s%s so it may be used outside an exit section. ", |
37ed19d5c
|
1351 1352 |
from, prl_from, fromsym, from_p, to, prl_to, tosym, to_p, |
5003bab82
|
1353 |
prl_to, tosym, to_p); |
37ed19d5c
|
1354 1355 |
free(prl_from); free(prl_to); |
588ccd732
|
1356 |
break; |
bbd3f4fb8
|
1357 |
case ANY_EXIT_TO_ANY_INIT: |
37ed19d5c
|
1358 1359 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 |
fprintf(stderr, "The %s %s%s%s references " "a %s %s%s%s. " "This is often seen when error handling " "in the exit function " "uses functionality in the init path. " "The fix is often to remove the %sannotation of " "%s%s so it may be used outside an init section. ", |
37ed19d5c
|
1374 1375 1376 1377 1378 |
from, prl_from, fromsym, from_p, to, prl_to, tosym, to_p, prl_to, tosym, to_p); free(prl_from); free(prl_to); |
588ccd732
|
1379 1380 |
break; case EXPORT_TO_INIT_EXIT: |
37ed19d5c
|
1381 |
prl_to = sec2annotation(tosec); |
588ccd732
|
1382 1383 1384 1385 1386 1387 |
fprintf(stderr, "The symbol %s is exported and annotated %s " "Fix this by removing the %sannotation of %s " "or drop the export. ", |
37ed19d5c
|
1388 1389 |
tosym, prl_to, prl_to, tosym); free(prl_to); |
588ccd732
|
1390 1391 1392 1393 |
break; } fprintf(stderr, " "); |
58fb0d4f2
|
1394 1395 1396 1397 1398 1399 |
} static void check_section_mismatch(const char *modname, struct elf_info *elf, Elf_Rela *r, Elf_Sym *sym, const char *fromsec) { const char *tosec; |
0d2a636ee
|
1400 |
const struct sectioncheck *mismatch; |
58fb0d4f2
|
1401 |
|
1ce53adf1
|
1402 |
tosec = sec_name(elf, get_secindex(elf, sym)); |
588ccd732
|
1403 |
mismatch = section_mismatch(fromsec, tosec); |
0d2a636ee
|
1404 |
if (mismatch) { |
588ccd732
|
1405 1406 |
Elf_Sym *to; Elf_Sym *from; |
58fb0d4f2
|
1407 |
const char *tosym; |
588ccd732
|
1408 |
const char *fromsym; |
58fb0d4f2
|
1409 |
|
588ccd732
|
1410 1411 1412 1413 |
from = find_elf_symbol2(elf, r->r_offset, fromsec); fromsym = sym_name(elf, from); to = find_elf_symbol(elf, r->r_addend, sym); tosym = sym_name(elf, to); |
58fb0d4f2
|
1414 1415 |
/* check whitelist - we may ignore it */ |
af92a82d0
|
1416 1417 |
if (secref_whitelist(mismatch, fromsec, fromsym, tosec, tosym)) { |
588ccd732
|
1418 1419 1420 1421 |
report_sec_mismatch(modname, mismatch, fromsec, r->r_offset, fromsym, is_function(from), tosec, tosym, is_function(to)); |
58fb0d4f2
|
1422 |
} |
b39927cf4
|
1423 1424 |
} } |
ae4ac1232
|
1425 |
static unsigned int *reloc_location(struct elf_info *elf, |
5b24c0715
|
1426 |
Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac1232
|
1427 1428 |
{ Elf_Shdr *sechdrs = elf->sechdrs; |
1ce53adf1
|
1429 |
int section = shndx2secindex(sechdr->sh_info); |
ae4ac1232
|
1430 1431 |
return (void *)elf->hdr + sechdrs[section].sh_offset + |
1c938663d
|
1432 |
r->r_offset - sechdrs[section].sh_addr; |
ae4ac1232
|
1433 |
} |
5b24c0715
|
1434 |
static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac1232
|
1435 1436 |
{ unsigned int r_typ = ELF_R_TYPE(r->r_info); |
5b24c0715
|
1437 |
unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac1232
|
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 |
switch (r_typ) { case R_386_32: r->r_addend = TO_NATIVE(*location); break; case R_386_PC32: r->r_addend = TO_NATIVE(*location) + 4; /* For CONFIG_RELOCATABLE=y */ if (elf->hdr->e_type == ET_EXEC) r->r_addend += r->r_offset; break; } return 0; } |
5b24c0715
|
1452 |
static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa2
|
1453 1454 1455 1456 1457 1458 |
{ unsigned int r_typ = ELF_R_TYPE(r->r_info); switch (r_typ) { case R_ARM_ABS32: /* From ARM ABI: (S + A) | T */ |
df578e7d8
|
1459 1460 |
r->r_addend = (int)(long) (elf->symtab_start + ELF_R_SYM(r->r_info)); |
56a974fa2
|
1461 1462 1463 |
break; case R_ARM_PC24: /* From ARM ABI: ((S + A) | T) - P */ |
df578e7d8
|
1464 |
r->r_addend = (int)(long)(elf->hdr + |
5b24c0715
|
1465 1466 |
sechdr->sh_offset + (r->r_offset - sechdr->sh_addr)); |
56a974fa2
|
1467 1468 1469 1470 1471 1472 |
break; default: return 1; } return 0; } |
5b24c0715
|
1473 |
static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac1232
|
1474 1475 |
{ unsigned int r_typ = ELF_R_TYPE(r->r_info); |
5b24c0715
|
1476 |
unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac1232
|
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 |
unsigned int inst; if (r_typ == R_MIPS_HI16) return 1; /* skip this */ inst = TO_NATIVE(*location); switch (r_typ) { case R_MIPS_LO16: r->r_addend = inst & 0xffff; break; case R_MIPS_26: r->r_addend = (inst & 0x03ffffff) << 2; break; case R_MIPS_32: r->r_addend = inst; break; } return 0; } |
5b24c0715
|
1495 |
static void section_rela(const char *modname, struct elf_info *elf, |
10668220a
|
1496 |
Elf_Shdr *sechdr) |
5b24c0715
|
1497 1498 1499 1500 1501 1502 |
{ Elf_Sym *sym; Elf_Rela *rela; Elf_Rela r; unsigned int r_sym; const char *fromsec; |
5b24c0715
|
1503 |
|
ff13f9269
|
1504 |
Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c0715
|
1505 |
Elf_Rela *stop = (void *)start + sechdr->sh_size; |
ff13f9269
|
1506 |
fromsec = sech_name(elf, sechdr); |
5b24c0715
|
1507 1508 |
fromsec += strlen(".rela"); /* if from section (name) is know good then skip it */ |
b614a697d
|
1509 |
if (match(fromsec, section_white_list)) |
5b24c0715
|
1510 |
return; |
e241a6303
|
1511 |
|
5b24c0715
|
1512 1513 1514 |
for (rela = start; rela < stop; rela++) { r.r_offset = TO_NATIVE(rela->r_offset); #if KERNEL_ELFCLASS == ELFCLASS64 |
ff13f9269
|
1515 |
if (elf->hdr->e_machine == EM_MIPS) { |
5b24c0715
|
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 |
unsigned int r_typ; r_sym = ELF64_MIPS_R_SYM(rela->r_info); r_sym = TO_NATIVE(r_sym); r_typ = ELF64_MIPS_R_TYPE(rela->r_info); r.r_info = ELF64_R_INFO(r_sym, r_typ); } 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 */ |
1ce53adf1
|
1532 |
if (is_shndx_special(sym->st_shndx)) |
5b24c0715
|
1533 |
continue; |
58fb0d4f2
|
1534 |
check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c0715
|
1535 1536 1537 1538 |
} } static void section_rel(const char *modname, struct elf_info *elf, |
10668220a
|
1539 |
Elf_Shdr *sechdr) |
5b24c0715
|
1540 1541 1542 1543 1544 1545 |
{ Elf_Sym *sym; Elf_Rel *rel; Elf_Rela r; unsigned int r_sym; const char *fromsec; |
5b24c0715
|
1546 |
|
ff13f9269
|
1547 |
Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c0715
|
1548 |
Elf_Rel *stop = (void *)start + sechdr->sh_size; |
ff13f9269
|
1549 |
fromsec = sech_name(elf, sechdr); |
5b24c0715
|
1550 1551 |
fromsec += strlen(".rel"); /* if from section (name) is know good then skip it */ |
b614a697d
|
1552 |
if (match(fromsec, section_white_list)) |
5b24c0715
|
1553 1554 1555 1556 1557 |
return; for (rel = start; rel < stop; rel++) { r.r_offset = TO_NATIVE(rel->r_offset); #if KERNEL_ELFCLASS == ELFCLASS64 |
ff13f9269
|
1558 |
if (elf->hdr->e_machine == EM_MIPS) { |
5b24c0715
|
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 |
unsigned int r_typ; r_sym = ELF64_MIPS_R_SYM(rel->r_info); r_sym = TO_NATIVE(r_sym); r_typ = ELF64_MIPS_R_TYPE(rel->r_info); r.r_info = ELF64_R_INFO(r_sym, r_typ); } 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; |
ff13f9269
|
1573 |
switch (elf->hdr->e_machine) { |
5b24c0715
|
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 |
case EM_386: if (addend_386_rel(elf, sechdr, &r)) continue; break; case EM_ARM: if (addend_arm_rel(elf, sechdr, &r)) continue; break; case EM_MIPS: if (addend_mips_rel(elf, sechdr, &r)) continue; break; } sym = elf->symtab_start + r_sym; /* Skip special sections */ |
1ce53adf1
|
1589 |
if (is_shndx_special(sym->st_shndx)) |
5b24c0715
|
1590 |
continue; |
58fb0d4f2
|
1591 |
check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c0715
|
1592 1593 |
} } |
b39927cf4
|
1594 1595 1596 1597 1598 1599 1600 |
/** * 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 |
32be1d223
|
1601 |
* only when a module is unloaded which never happens for built-in modules. |
b39927cf4
|
1602 1603 1604 1605 1606 |
* 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, |
10668220a
|
1607 |
struct elf_info *elf) |
b39927cf4
|
1608 1609 |
{ int i; |
b39927cf4
|
1610 |
Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa42
|
1611 |
|
b39927cf4
|
1612 |
/* Walk through all sections */ |
1ce53adf1
|
1613 |
for (i = 0; i < elf->num_sections; i++) { |
b614a697d
|
1614 |
check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf4
|
1615 |
/* We want to process only relocation sections and not .init */ |
5b24c0715
|
1616 |
if (sechdrs[i].sh_type == SHT_RELA) |
10668220a
|
1617 |
section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c0715
|
1618 |
else if (sechdrs[i].sh_type == SHT_REL) |
10668220a
|
1619 |
section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf4
|
1620 1621 |
} } |
5c3ead8c7
|
1622 |
static void read_symbols(char *modname) |
1da177e4c
|
1623 1624 1625 |
{ const char *symname; char *version; |
b817f6fef
|
1626 |
char *license; |
1da177e4c
|
1627 1628 1629 |
struct module *mod; struct elf_info info = { }; Elf_Sym *sym; |
85bd2fddd
|
1630 1631 |
if (!parse_elf(&info, modname)) return; |
1da177e4c
|
1632 1633 1634 1635 1636 1637 |
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)) { |
1da177e4c
|
1638 |
have_vmlinux = 1; |
1da177e4c
|
1639 1640 |
mod->skip = 1; } |
b817f6fef
|
1641 |
license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa365682
|
1642 1643 1644 1645 1646 1647 |
if (info.modinfo && !license && !is_vmlinux(modname)) warn("modpost: missing MODULE_LICENSE() in %s " "see include/linux/module.h for " "more information ", modname); |
b817f6fef
|
1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 |
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); } |
1da177e4c
|
1658 1659 1660 1661 1662 1663 |
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); } |
d1f25e665
|
1664 |
if (!is_vmlinux(modname) || |
10668220a
|
1665 1666 |
(is_vmlinux(modname) && vmlinux_section_warnings)) check_sec_ref(mod, modname, &info); |
1da177e4c
|
1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 |
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); |
8c8ef42ae
|
1677 |
/* Our trick to get versioning for module struct etc. - it's |
1da177e4c
|
1678 1679 1680 1681 |
* 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) |
8c8ef42ae
|
1682 |
mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4c
|
1683 1684 1685 1686 1687 1688 1689 |
} #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 */ |
5c3ead8c7
|
1690 1691 |
void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, const char *fmt, ...) |
1da177e4c
|
1692 1693 1694 1695 |
{ char tmp[SZ]; int len; va_list ap; |
62070fa42
|
1696 |
|
1da177e4c
|
1697 1698 |
va_start(ap, fmt); len = vsnprintf(tmp, SZ, fmt, ap); |
7670f023a
|
1699 |
buf_write(buf, tmp, len); |
1da177e4c
|
1700 1701 |
va_end(ap); } |
5c3ead8c7
|
1702 |
void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4c
|
1703 1704 |
{ if (buf->size - buf->pos < len) { |
7670f023a
|
1705 |
buf->size += len + SZ; |
1da177e4c
|
1706 1707 1708 1709 1710 |
buf->p = realloc(buf->p, buf->size); } strncpy(buf->p + buf->pos, s, len); buf->pos += len; } |
c96fca213
|
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 |
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' ", m, e, s); break; case export_unused_gpl: fatal("modpost: GPL-incompatible module %s%s " "uses GPL-only symbol marked UNUSED '%s' ", m, e, s); break; case export_gpl_future: warn("modpost: GPL-incompatible module %s%s " "uses future GPL-only symbol '%s' ", m, e, s); break; case export_plain: case export_unused: case export_unknown: /* ignore */ break; } } |
df578e7d8
|
1738 |
static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca213
|
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 |
{ 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 ", m, e, s); break; default: /* ignore */ break; } } static void check_exports(struct module *mod) |
b817f6fef
|
1756 1757 1758 1759 |
{ struct symbol *s, *exp; for (s = mod->unres; s; s = s->next) { |
6449bd621
|
1760 |
const char *basename; |
b817f6fef
|
1761 1762 1763 |
exp = find_symbol(s->name); if (!exp || exp->module == mod) continue; |
6449bd621
|
1764 |
basename = strrchr(mod->name, '/'); |
b817f6fef
|
1765 1766 |
if (basename) basename++; |
c96fca213
|
1767 1768 1769 1770 1771 |
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); |
df578e7d8
|
1772 |
} |
b817f6fef
|
1773 |
} |
5c3ead8c7
|
1774 1775 1776 1777 |
/** * Header for the generated file **/ static void add_header(struct buffer *b, struct module *mod) |
1da177e4c
|
1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 |
{ buf_printf(b, "#include <linux/module.h> "); buf_printf(b, "#include <linux/vermagic.h> "); buf_printf(b, "#include <linux/compiler.h> "); buf_printf(b, " "); buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING); "); buf_printf(b, " "); |
1da177e4c
|
1791 1792 1793 1794 |
buf_printf(b, "struct module __this_module "); buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = { "); |
f83b5e323
|
1795 1796 |
buf_printf(b, " .name = KBUILD_MODNAME, "); |
1da177e4c
|
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 |
if (mod->has_init) buf_printf(b, " .init = init_module, "); if (mod->has_cleanup) buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD " " .exit = cleanup_module, " "#endif "); |
e61a1c1c4
|
1807 1808 |
buf_printf(b, " .arch = MODULE_ARCH_INIT, "); |
1da177e4c
|
1809 1810 1811 |
buf_printf(b, "}; "); } |
5c7251384
|
1812 |
static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf05
|
1813 1814 1815 1816 1817 1818 1819 1820 |
{ static const char *staging_dir = "drivers/staging"; if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) buf_printf(b, " MODULE_INFO(staging, \"Y\"); "); } |
5c3ead8c7
|
1821 1822 1823 |
/** * Record CRCs for unresolved symbols **/ |
c53ddacdc
|
1824 |
static int add_versions(struct buffer *b, struct module *mod) |
1da177e4c
|
1825 1826 |
{ struct symbol *s, *exp; |
c53ddacdc
|
1827 |
int err = 0; |
1da177e4c
|
1828 1829 1830 1831 |
for (s = mod->unres; s; s = s->next) { exp = find_symbol(s->name); if (!exp || exp->module == mod) { |
c53ddacdc
|
1832 |
if (have_vmlinux && !s->weak) { |
2a1166594
|
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 |
if (warn_unresolved) { warn("\"%s\" [%s.ko] undefined! ", s->name, mod->name); } else { merror("\"%s\" [%s.ko] undefined! ", s->name, mod->name); err = 1; } |
c53ddacdc
|
1843 |
} |
1da177e4c
|
1844 1845 1846 1847 1848 1849 1850 1851 |
continue; } s->module = exp->module; s->crc_valid = exp->crc_valid; s->crc = exp->crc; } if (!modversions) |
c53ddacdc
|
1852 |
return err; |
1da177e4c
|
1853 1854 1855 1856 1857 |
buf_printf(b, " "); buf_printf(b, "static const struct modversion_info ____versions[] "); |
3ff6eecca
|
1858 1859 |
buf_printf(b, "__used "); |
1da177e4c
|
1860 1861 1862 1863 |
buf_printf(b, "__attribute__((section(\"__versions\"))) = { "); for (s = mod->unres; s; s = s->next) { |
df578e7d8
|
1864 |
if (!s->module) |
1da177e4c
|
1865 |
continue; |
1da177e4c
|
1866 |
if (!s->crc_valid) { |
cb80514d9
|
1867 1868 |
warn("\"%s\" [%s.ko] has no CRC! ", |
1da177e4c
|
1869 1870 1871 1872 1873 1874 1875 1876 1877 |
s->name, mod->name); continue; } buf_printf(b, "\t{ %#8x, \"%s\" }, ", s->crc, s->name); } buf_printf(b, "}; "); |
c53ddacdc
|
1878 1879 |
return err; |
1da177e4c
|
1880 |
} |
5c3ead8c7
|
1881 1882 |
static void add_depends(struct buffer *b, struct module *mod, struct module *modules) |
1da177e4c
|
1883 1884 1885 1886 |
{ struct symbol *s; struct module *m; int first = 1; |
df578e7d8
|
1887 |
for (m = modules; m; m = m->next) |
1da177e4c
|
1888 |
m->seen = is_vmlinux(m->name); |
1da177e4c
|
1889 1890 1891 1892 1893 |
buf_printf(b, " "); buf_printf(b, "static const char __module_depends[] "); |
3ff6eecca
|
1894 1895 |
buf_printf(b, "__used "); |
1da177e4c
|
1896 1897 1898 1899 |
buf_printf(b, "__attribute__((section(\".modinfo\"))) = "); buf_printf(b, "\"depends="); for (s = mod->unres; s; s = s->next) { |
a61b2dfd1
|
1900 |
const char *p; |
1da177e4c
|
1901 1902 1903 1904 1905 1906 1907 |
if (!s->module) continue; if (s->module->seen) continue; s->module->seen = 1; |
df578e7d8
|
1908 1909 |
p = strrchr(s->module->name, '/'); if (p) |
a61b2dfd1
|
1910 1911 1912 1913 |
p++; else p = s->module->name; buf_printf(b, "%s%s", first ? "" : ",", p); |
1da177e4c
|
1914 1915 1916 1917 1918 |
first = 0; } buf_printf(b, "\"; "); } |
5c3ead8c7
|
1919 |
static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4c
|
1920 1921 1922 1923 1924 1925 1926 1927 1928 |
{ if (mod->srcversion[0]) { buf_printf(b, " "); buf_printf(b, "MODULE_INFO(srcversion, \"%s\"); ", mod->srcversion); } } |
5c3ead8c7
|
1929 |
static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4c
|
1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 |
{ 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); } |
bd5cbcedf
|
1972 |
/* parse Module.symvers file. line format: |
534b89a9f
|
1973 |
* 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbcedf
|
1974 |
**/ |
040fcc819
|
1975 |
static void read_dump(const char *fname, unsigned int kernel) |
1da177e4c
|
1976 1977 1978 1979 |
{ unsigned long size, pos = 0; void *file = grab_file(fname, &size); char *line; |
df578e7d8
|
1980 |
if (!file) |
1da177e4c
|
1981 1982 1983 1984 |
/* No symbol versions, silently ignore */ return; while ((line = get_next_line(&pos, file, size))) { |
534b89a9f
|
1985 |
char *symname, *modname, *d, *export, *end; |
1da177e4c
|
1986 1987 |
unsigned int crc; struct module *mod; |
040fcc819
|
1988 |
struct symbol *s; |
1da177e4c
|
1989 1990 1991 1992 1993 1994 1995 |
if (!(symname = strchr(line, '\t'))) goto fail; *symname++ = '\0'; if (!(modname = strchr(symname, '\t'))) goto fail; *modname++ = '\0'; |
9ac545b0f
|
1996 |
if ((export = strchr(modname, '\t')) != NULL) |
bd5cbcedf
|
1997 |
*export++ = '\0'; |
534b89a9f
|
1998 1999 |
if (export && ((end = strchr(export, '\t')) != NULL)) *end = '\0'; |
1da177e4c
|
2000 2001 2002 |
crc = strtoul(line, &d, 16); if (*symname == '\0' || *modname == '\0' || *d != '\0') goto fail; |
df578e7d8
|
2003 2004 2005 |
mod = find_module(modname); if (!mod) { if (is_vmlinux(modname)) |
1da177e4c
|
2006 |
have_vmlinux = 1; |
0fa3a88cf
|
2007 |
mod = new_module(modname); |
1da177e4c
|
2008 2009 |
mod->skip = 1; } |
bd5cbcedf
|
2010 |
s = sym_add_exported(symname, mod, export_no(export)); |
8e70c4588
|
2011 2012 |
s->kernel = kernel; s->preloaded = 1; |
bd5cbcedf
|
2013 |
sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4c
|
2014 2015 2016 2017 2018 2019 |
} return; fail: fatal("parse error in symbol dump file "); } |
040fcc819
|
2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 |
/* 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; } |
62070fa42
|
2032 |
|
5c3ead8c7
|
2033 |
static void write_dump(const char *fname) |
1da177e4c
|
2034 2035 2036 2037 2038 2039 2040 2041 |
{ struct buffer buf = { }; struct symbol *symbol; int n; for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { symbol = symbolhash[n]; while (symbol) { |
040fcc819
|
2042 |
if (dump_sym(symbol)) |
bd5cbcedf
|
2043 2044 |
buf_printf(&buf, "0x%08x\t%s\t%s\t%s ", |
62070fa42
|
2045 |
symbol->crc, symbol->name, |
bd5cbcedf
|
2046 2047 |
symbol->module->name, export_str(symbol->export)); |
1da177e4c
|
2048 2049 2050 2051 2052 |
symbol = symbol->next; } } write_if_changed(&buf, fname); } |
2d04b5ae1
|
2053 2054 2055 2056 |
struct ext_sym_list { struct ext_sym_list *next; const char *file; }; |
5c3ead8c7
|
2057 |
int main(int argc, char **argv) |
1da177e4c
|
2058 2059 2060 |
{ struct module *mod; struct buffer buf = { }; |
040fcc819
|
2061 2062 |
char *kernel_read = NULL, *module_read = NULL; char *dump_write = NULL; |
1da177e4c
|
2063 |
int opt; |
c53ddacdc
|
2064 |
int err; |
2d04b5ae1
|
2065 2066 |
struct ext_sym_list *extsym_iter; struct ext_sym_list *extsym_start = NULL; |
1da177e4c
|
2067 |
|
2d04b5ae1
|
2068 |
while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { |
df578e7d8
|
2069 2070 2071 2072 2073 2074 2075 2076 |
switch (opt) { case 'i': kernel_read = optarg; break; case 'I': module_read = optarg; external_module = 1; break; |
4ce6efed4
|
2077 2078 2079 |
case 'c': cross_build = 1; break; |
2d04b5ae1
|
2080 2081 2082 2083 2084 2085 2086 2087 |
case 'e': external_module = 1; extsym_iter = NOFAIL(malloc(sizeof(*extsym_iter))); extsym_iter->next = extsym_start; extsym_iter->file = optarg; extsym_start = extsym_iter; break; |
df578e7d8
|
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 |
case 'm': modversions = 1; break; case 'o': dump_write = optarg; break; case 'a': all_versions = 1; break; case 's': vmlinux_section_warnings = 0; break; |
588ccd732
|
2100 2101 2102 |
case 'S': sec_mismatch_verbose = 0; break; |
df578e7d8
|
2103 2104 2105 2106 2107 |
case 'w': warn_unresolved = 1; break; default: exit(1); |
1da177e4c
|
2108 2109 |
} } |
040fcc819
|
2110 2111 2112 2113 |
if (kernel_read) read_dump(kernel_read, 1); if (module_read) read_dump(module_read, 0); |
2d04b5ae1
|
2114 2115 2116 2117 2118 2119 |
while (extsym_start) { read_dump(extsym_start->file, 0); extsym_iter = extsym_start->next; free(extsym_start); extsym_start = extsym_iter; } |
1da177e4c
|
2120 |
|
df578e7d8
|
2121 |
while (optind < argc) |
1da177e4c
|
2122 |
read_symbols(argv[optind++]); |
1da177e4c
|
2123 2124 2125 2126 |
for (mod = modules; mod; mod = mod->next) { if (mod->skip) continue; |
c96fca213
|
2127 |
check_exports(mod); |
b817f6fef
|
2128 |
} |
c53ddacdc
|
2129 |
err = 0; |
b817f6fef
|
2130 |
for (mod = modules; mod; mod = mod->next) { |
666ab414f
|
2131 |
char fname[strlen(mod->name) + 10]; |
b817f6fef
|
2132 2133 |
if (mod->skip) continue; |
1da177e4c
|
2134 2135 2136 2137 |
buf.pos = 0; add_header(&buf, mod); |
a9860bf05
|
2138 |
add_staging_flag(&buf, mod->name); |
c53ddacdc
|
2139 |
err |= add_versions(&buf, mod); |
1da177e4c
|
2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 |
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); |
588ccd732
|
2150 |
if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495e
|
2151 2152 2153 2154 2155 2156 2157 |
warn("modpost: Found %d section mismatch(es). " "To see full details build your kernel with: " "'make CONFIG_DEBUG_SECTION_MISMATCH=y' ", sec_mismatch_count); |
1da177e4c
|
2158 |
|
c53ddacdc
|
2159 |
return err; |
1da177e4c
|
2160 |
} |