803 lines
17 KiB
C
803 lines
17 KiB
C
/* Postprocess module symbol versions
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*
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* Copyright 2003 Kai Germaschewski
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* Copyright 2002-2004 Rusty Russell, IBM Corporation
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*
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* Based in part on module-init-tools/depmod.c,file2alias
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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* Usage: modpost vmlinux module1.o module2.o ...
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*/
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#include <ctype.h>
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#include "modpost.h"
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/* Are we using CONFIG_MODVERSIONS? */
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int modversions = 0;
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/* Warn about undefined symbols? (do so if we have vmlinux) */
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int have_vmlinux = 0;
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/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
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static int all_versions = 0;
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void
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fatal(const char *fmt, ...)
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{
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va_list arglist;
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fprintf(stderr, "FATAL: ");
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va_start(arglist, fmt);
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vfprintf(stderr, fmt, arglist);
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va_end(arglist);
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exit(1);
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}
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void
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warn(const char *fmt, ...)
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{
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va_list arglist;
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fprintf(stderr, "WARNING: ");
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va_start(arglist, fmt);
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vfprintf(stderr, fmt, arglist);
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va_end(arglist);
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}
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void *do_nofail(void *ptr, const char *expr)
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{
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if (!ptr) {
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fatal("modpost: Memory allocation failure: %s.\n", expr);
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}
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return ptr;
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}
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/* A list of all modules we processed */
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static struct module *modules;
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struct module *
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find_module(char *modname)
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{
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struct module *mod;
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for (mod = modules; mod; mod = mod->next)
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if (strcmp(mod->name, modname) == 0)
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break;
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return mod;
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}
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struct module *
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new_module(char *modname)
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{
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struct module *mod;
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char *p, *s;
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mod = NOFAIL(malloc(sizeof(*mod)));
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memset(mod, 0, sizeof(*mod));
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p = NOFAIL(strdup(modname));
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/* strip trailing .o */
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if ((s = strrchr(p, '.')) != NULL)
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if (strcmp(s, ".o") == 0)
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*s = '\0';
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/* add to list */
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mod->name = p;
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mod->next = modules;
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modules = mod;
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return mod;
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}
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/* A hash of all exported symbols,
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* struct symbol is also used for lists of unresolved symbols */
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#define SYMBOL_HASH_SIZE 1024
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struct symbol {
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struct symbol *next;
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struct module *module;
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unsigned int crc;
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int crc_valid;
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unsigned int weak:1;
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char name[0];
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};
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static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
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/* This is based on the hash agorithm from gdbm, via tdb */
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static inline unsigned int tdb_hash(const char *name)
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{
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unsigned value; /* Used to compute the hash value. */
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unsigned i; /* Used to cycle through random values. */
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/* 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)));
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return (1103515243 * value + 12345);
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}
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/* Allocate a new symbols for use in the hash of exported symbols or
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* the list of unresolved symbols per module */
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struct symbol *
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alloc_symbol(const char *name, unsigned int weak, struct symbol *next)
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{
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struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
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memset(s, 0, sizeof(*s));
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strcpy(s->name, name);
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s->weak = weak;
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s->next = next;
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return s;
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}
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/* For the hash of exported symbols */
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void
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new_symbol(const char *name, struct module *module, unsigned int *crc)
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{
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unsigned int hash;
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struct symbol *new;
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hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
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new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
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new->module = module;
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if (crc) {
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new->crc = *crc;
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new->crc_valid = 1;
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}
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}
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struct symbol *
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find_symbol(const char *name)
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{
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struct symbol *s;
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/* For our purposes, .foo matches foo. PPC64 needs this. */
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if (name[0] == '.')
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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)
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return s;
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}
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return NULL;
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}
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/* Add an exported symbol - it may have already been added without a
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* CRC, in this case just update the CRC */
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void
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add_exported_symbol(const char *name, struct module *module, unsigned int *crc)
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{
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struct symbol *s = find_symbol(name);
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if (!s) {
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new_symbol(name, module, crc);
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return;
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}
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if (crc) {
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s->crc = *crc;
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s->crc_valid = 1;
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}
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}
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void *
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grab_file(const char *filename, unsigned long *size)
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{
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struct stat st;
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void *map;
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int fd;
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fd = open(filename, O_RDONLY);
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if (fd < 0 || fstat(fd, &st) != 0)
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return NULL;
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*size = st.st_size;
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map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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close(fd);
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if (map == MAP_FAILED)
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return NULL;
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return map;
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}
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/*
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Return a copy of the next line in a mmap'ed file.
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spaces in the beginning of the line is trimmed away.
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Return a pointer to a static buffer.
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*/
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char*
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get_next_line(unsigned long *pos, void *file, unsigned long size)
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{
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static char line[4096];
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int skip = 1;
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size_t len = 0;
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signed char *p = (signed char *)file + *pos;
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char *s = line;
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for (; *pos < size ; (*pos)++)
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{
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if (skip && isspace(*p)) {
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p++;
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continue;
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}
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skip = 0;
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if (*p != '\n' && (*pos < size)) {
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len++;
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*s++ = *p++;
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if (len > 4095)
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break; /* Too long, stop */
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} else {
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/* End of string */
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*s = '\0';
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return line;
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}
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}
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/* End of buffer */
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return NULL;
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}
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void
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release_file(void *file, unsigned long size)
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{
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munmap(file, size);
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}
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void
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parse_elf(struct elf_info *info, const char *filename)
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{
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unsigned int i;
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Elf_Ehdr *hdr = info->hdr;
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Elf_Shdr *sechdrs;
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Elf_Sym *sym;
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hdr = grab_file(filename, &info->size);
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if (!hdr) {
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perror(filename);
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abort();
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}
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info->hdr = hdr;
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if (info->size < sizeof(*hdr))
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goto truncated;
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/* Fix endianness in ELF header */
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hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
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hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
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hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
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hdr->e_machine = TO_NATIVE(hdr->e_machine);
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sechdrs = (void *)hdr + hdr->e_shoff;
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info->sechdrs = sechdrs;
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/* Fix endianness in section headers */
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for (i = 0; i < hdr->e_shnum; i++) {
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sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
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sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
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sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
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sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
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sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
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}
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/* Find symbol table. */
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for (i = 1; i < hdr->e_shnum; i++) {
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const char *secstrings
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= (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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if (sechdrs[i].sh_offset > info->size)
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goto truncated;
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if (strcmp(secstrings+sechdrs[i].sh_name, ".modinfo") == 0) {
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info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
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info->modinfo_len = sechdrs[i].sh_size;
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}
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if (sechdrs[i].sh_type != SHT_SYMTAB)
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continue;
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info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
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info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
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+ sechdrs[i].sh_size;
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info->strtab = (void *)hdr +
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sechdrs[sechdrs[i].sh_link].sh_offset;
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}
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if (!info->symtab_start) {
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fprintf(stderr, "modpost: %s no symtab?\n", filename);
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abort();
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}
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/* Fix endianness in symbols */
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for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
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sym->st_shndx = TO_NATIVE(sym->st_shndx);
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sym->st_name = TO_NATIVE(sym->st_name);
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sym->st_value = TO_NATIVE(sym->st_value);
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sym->st_size = TO_NATIVE(sym->st_size);
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}
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return;
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truncated:
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fprintf(stderr, "modpost: %s is truncated.\n", filename);
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abort();
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}
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void
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parse_elf_finish(struct elf_info *info)
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{
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release_file(info->hdr, info->size);
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}
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#define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
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#define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
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void
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handle_modversions(struct module *mod, struct elf_info *info,
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Elf_Sym *sym, const char *symname)
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{
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unsigned int crc;
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switch (sym->st_shndx) {
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case SHN_COMMON:
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fprintf(stderr, "*** Warning: \"%s\" [%s] is COMMON symbol\n",
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symname, mod->name);
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break;
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case SHN_ABS:
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/* CRC'd symbol */
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if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
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crc = (unsigned int) sym->st_value;
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add_exported_symbol(symname + strlen(CRC_PFX),
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mod, &crc);
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}
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break;
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case SHN_UNDEF:
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/* undefined symbol */
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if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
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ELF_ST_BIND(sym->st_info) != STB_WEAK)
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break;
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/* ignore global offset table */
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if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
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break;
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/* ignore __this_module, it will be resolved shortly */
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if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
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break;
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/* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
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#if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
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/* add compatibility with older glibc */
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#ifndef STT_SPARC_REGISTER
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#define STT_SPARC_REGISTER STT_REGISTER
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#endif
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if (info->hdr->e_machine == EM_SPARC ||
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info->hdr->e_machine == EM_SPARCV9) {
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/* Ignore register directives. */
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if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
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break;
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}
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#endif
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if (memcmp(symname, MODULE_SYMBOL_PREFIX,
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strlen(MODULE_SYMBOL_PREFIX)) == 0)
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mod->unres = alloc_symbol(symname +
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strlen(MODULE_SYMBOL_PREFIX),
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ELF_ST_BIND(sym->st_info) == STB_WEAK,
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mod->unres);
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break;
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default:
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/* All exported symbols */
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if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
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add_exported_symbol(symname + strlen(KSYMTAB_PFX),
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mod, NULL);
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}
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if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
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mod->has_init = 1;
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if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
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mod->has_cleanup = 1;
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break;
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}
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}
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int
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is_vmlinux(const char *modname)
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{
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const char *myname;
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if ((myname = strrchr(modname, '/')))
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myname++;
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else
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myname = modname;
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return strcmp(myname, "vmlinux") == 0;
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}
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/* Parse tag=value strings from .modinfo section */
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static char *next_string(char *string, unsigned long *secsize)
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{
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/* Skip non-zero chars */
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while (string[0]) {
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string++;
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if ((*secsize)-- <= 1)
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return NULL;
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}
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/* Skip any zero padding. */
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while (!string[0]) {
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string++;
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if ((*secsize)-- <= 1)
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return NULL;
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}
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return string;
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}
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static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
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const char *tag)
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{
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char *p;
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unsigned int taglen = strlen(tag);
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unsigned long size = modinfo_len;
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for (p = modinfo; p; p = next_string(p, &size)) {
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if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
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return p + taglen + 1;
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}
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return NULL;
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}
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void
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read_symbols(char *modname)
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{
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const char *symname;
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char *version;
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struct module *mod;
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struct elf_info info = { };
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Elf_Sym *sym;
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parse_elf(&info, modname);
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mod = new_module(modname);
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/* When there's no vmlinux, don't print warnings about
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* unresolved symbols (since there'll be too many ;) */
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if (is_vmlinux(modname)) {
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unsigned int fake_crc = 0;
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have_vmlinux = 1;
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add_exported_symbol("struct_module", mod, &fake_crc);
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mod->skip = 1;
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}
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for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
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symname = info.strtab + sym->st_name;
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handle_modversions(mod, &info, sym, symname);
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handle_moddevtable(mod, &info, sym, symname);
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}
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version = get_modinfo(info.modinfo, info.modinfo_len, "version");
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if (version)
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maybe_frob_rcs_version(modname, version, info.modinfo,
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version - (char *)info.hdr);
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if (version || (all_versions && !is_vmlinux(modname)))
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get_src_version(modname, mod->srcversion,
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sizeof(mod->srcversion)-1);
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parse_elf_finish(&info);
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/* Our trick to get versioning for struct_module - it's
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* never passed as an argument to an exported function, so
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* the automatic versioning doesn't pick it up, but it's really
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* important anyhow */
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if (modversions)
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mod->unres = alloc_symbol("struct_module", 0, mod->unres);
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}
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#define SZ 500
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/* We first write the generated file into memory using the
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* following helper, then compare to the file on disk and
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* only update the later if anything changed */
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void __attribute__((format(printf, 2, 3)))
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buf_printf(struct buffer *buf, const char *fmt, ...)
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{
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char tmp[SZ];
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int len;
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va_list ap;
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va_start(ap, fmt);
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len = vsnprintf(tmp, SZ, fmt, ap);
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if (buf->size - buf->pos < len + 1) {
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buf->size += 128;
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buf->p = realloc(buf->p, buf->size);
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}
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strncpy(buf->p + buf->pos, tmp, len + 1);
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buf->pos += len;
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va_end(ap);
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}
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void
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buf_write(struct buffer *buf, const char *s, int len)
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{
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if (buf->size - buf->pos < len) {
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buf->size += len;
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buf->p = realloc(buf->p, buf->size);
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}
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strncpy(buf->p + buf->pos, s, len);
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buf->pos += len;
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}
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/* Header for the generated file */
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void
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add_header(struct buffer *b, struct module *mod)
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{
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buf_printf(b, "#include <linux/module.h>\n");
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buf_printf(b, "#include <linux/vermagic.h>\n");
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buf_printf(b, "#include <linux/compiler.h>\n");
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buf_printf(b, "\n");
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buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
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buf_printf(b, "\n");
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buf_printf(b, "#undef unix\n"); /* We have a module called "unix" */
|
|
buf_printf(b, "struct module __this_module\n");
|
|
buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
|
|
buf_printf(b, " .name = __stringify(KBUILD_MODNAME),\n");
|
|
if (mod->has_init)
|
|
buf_printf(b, " .init = init_module,\n");
|
|
if (mod->has_cleanup)
|
|
buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
|
|
" .exit = cleanup_module,\n"
|
|
"#endif\n");
|
|
buf_printf(b, "};\n");
|
|
}
|
|
|
|
/* Record CRCs for unresolved symbols */
|
|
|
|
void
|
|
add_versions(struct buffer *b, struct module *mod)
|
|
{
|
|
struct symbol *s, *exp;
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
exp = find_symbol(s->name);
|
|
if (!exp || exp->module == mod) {
|
|
if (have_vmlinux && !s->weak)
|
|
fprintf(stderr, "*** Warning: \"%s\" [%s.ko] "
|
|
"undefined!\n", s->name, mod->name);
|
|
continue;
|
|
}
|
|
s->module = exp->module;
|
|
s->crc_valid = exp->crc_valid;
|
|
s->crc = exp->crc;
|
|
}
|
|
|
|
if (!modversions)
|
|
return;
|
|
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "static const struct modversion_info ____versions[]\n");
|
|
buf_printf(b, "__attribute_used__\n");
|
|
buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
if (!s->module) {
|
|
continue;
|
|
}
|
|
if (!s->crc_valid) {
|
|
fprintf(stderr, "*** Warning: \"%s\" [%s.ko] "
|
|
"has no CRC!\n",
|
|
s->name, mod->name);
|
|
continue;
|
|
}
|
|
buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
|
|
}
|
|
|
|
buf_printf(b, "};\n");
|
|
}
|
|
|
|
void
|
|
add_depends(struct buffer *b, struct module *mod, struct module *modules)
|
|
{
|
|
struct symbol *s;
|
|
struct module *m;
|
|
int first = 1;
|
|
|
|
for (m = modules; m; m = m->next) {
|
|
m->seen = is_vmlinux(m->name);
|
|
}
|
|
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "static const char __module_depends[]\n");
|
|
buf_printf(b, "__attribute_used__\n");
|
|
buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
|
|
buf_printf(b, "\"depends=");
|
|
for (s = mod->unres; s; s = s->next) {
|
|
if (!s->module)
|
|
continue;
|
|
|
|
if (s->module->seen)
|
|
continue;
|
|
|
|
s->module->seen = 1;
|
|
buf_printf(b, "%s%s", first ? "" : ",",
|
|
strrchr(s->module->name, '/') + 1);
|
|
first = 0;
|
|
}
|
|
buf_printf(b, "\";\n");
|
|
}
|
|
|
|
void
|
|
add_srcversion(struct buffer *b, struct module *mod)
|
|
{
|
|
if (mod->srcversion[0]) {
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
|
|
mod->srcversion);
|
|
}
|
|
}
|
|
|
|
void
|
|
write_if_changed(struct buffer *b, const char *fname)
|
|
{
|
|
char *tmp;
|
|
FILE *file;
|
|
struct stat st;
|
|
|
|
file = fopen(fname, "r");
|
|
if (!file)
|
|
goto write;
|
|
|
|
if (fstat(fileno(file), &st) < 0)
|
|
goto close_write;
|
|
|
|
if (st.st_size != b->pos)
|
|
goto close_write;
|
|
|
|
tmp = NOFAIL(malloc(b->pos));
|
|
if (fread(tmp, 1, b->pos, file) != b->pos)
|
|
goto free_write;
|
|
|
|
if (memcmp(tmp, b->p, b->pos) != 0)
|
|
goto free_write;
|
|
|
|
free(tmp);
|
|
fclose(file);
|
|
return;
|
|
|
|
free_write:
|
|
free(tmp);
|
|
close_write:
|
|
fclose(file);
|
|
write:
|
|
file = fopen(fname, "w");
|
|
if (!file) {
|
|
perror(fname);
|
|
exit(1);
|
|
}
|
|
if (fwrite(b->p, 1, b->pos, file) != b->pos) {
|
|
perror(fname);
|
|
exit(1);
|
|
}
|
|
fclose(file);
|
|
}
|
|
|
|
void
|
|
read_dump(const char *fname)
|
|
{
|
|
unsigned long size, pos = 0;
|
|
void *file = grab_file(fname, &size);
|
|
char *line;
|
|
|
|
if (!file)
|
|
/* No symbol versions, silently ignore */
|
|
return;
|
|
|
|
while ((line = get_next_line(&pos, file, size))) {
|
|
char *symname, *modname, *d;
|
|
unsigned int crc;
|
|
struct module *mod;
|
|
|
|
if (!(symname = strchr(line, '\t')))
|
|
goto fail;
|
|
*symname++ = '\0';
|
|
if (!(modname = strchr(symname, '\t')))
|
|
goto fail;
|
|
*modname++ = '\0';
|
|
if (strchr(modname, '\t'))
|
|
goto fail;
|
|
crc = strtoul(line, &d, 16);
|
|
if (*symname == '\0' || *modname == '\0' || *d != '\0')
|
|
goto fail;
|
|
|
|
if (!(mod = find_module(modname))) {
|
|
if (is_vmlinux(modname)) {
|
|
have_vmlinux = 1;
|
|
}
|
|
mod = new_module(NOFAIL(strdup(modname)));
|
|
mod->skip = 1;
|
|
}
|
|
add_exported_symbol(symname, mod, &crc);
|
|
}
|
|
return;
|
|
fail:
|
|
fatal("parse error in symbol dump file\n");
|
|
}
|
|
|
|
void
|
|
write_dump(const char *fname)
|
|
{
|
|
struct buffer buf = { };
|
|
struct symbol *symbol;
|
|
int n;
|
|
|
|
for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
|
|
symbol = symbolhash[n];
|
|
while (symbol) {
|
|
symbol = symbol->next;
|
|
}
|
|
}
|
|
|
|
for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
|
|
symbol = symbolhash[n];
|
|
while (symbol) {
|
|
buf_printf(&buf, "0x%08x\t%s\t%s\n", symbol->crc,
|
|
symbol->name, symbol->module->name);
|
|
symbol = symbol->next;
|
|
}
|
|
}
|
|
write_if_changed(&buf, fname);
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
struct module *mod;
|
|
struct buffer buf = { };
|
|
char fname[SZ];
|
|
char *dump_read = NULL, *dump_write = NULL;
|
|
int opt;
|
|
|
|
while ((opt = getopt(argc, argv, "i:mo:a")) != -1) {
|
|
switch(opt) {
|
|
case 'i':
|
|
dump_read = optarg;
|
|
break;
|
|
case 'm':
|
|
modversions = 1;
|
|
break;
|
|
case 'o':
|
|
dump_write = optarg;
|
|
break;
|
|
case 'a':
|
|
all_versions = 1;
|
|
break;
|
|
default:
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
if (dump_read)
|
|
read_dump(dump_read);
|
|
|
|
while (optind < argc) {
|
|
read_symbols(argv[optind++]);
|
|
}
|
|
|
|
for (mod = modules; mod; mod = mod->next) {
|
|
if (mod->skip)
|
|
continue;
|
|
|
|
buf.pos = 0;
|
|
|
|
add_header(&buf, mod);
|
|
add_versions(&buf, mod);
|
|
add_depends(&buf, mod, modules);
|
|
add_moddevtable(&buf, mod);
|
|
add_srcversion(&buf, mod);
|
|
|
|
sprintf(fname, "%s.mod.c", mod->name);
|
|
write_if_changed(&buf, fname);
|
|
}
|
|
|
|
if (dump_write)
|
|
write_dump(dump_write);
|
|
|
|
return 0;
|
|
}
|
|
|