mirror of
https://github.com/edk2-porting/linux-next.git
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1abe02fef9
We should do better here by effetively "dereferencing" references to the .toc (or the .got2) section, but that is much harder. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
1734 lines
43 KiB
C
1734 lines
43 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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* Copyright 2006 Sam Ravnborg
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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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#include "../../include/linux/license.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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/* If we are modposting external module set to 1 */
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static int external_module = 0;
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/* Only warn about unresolved symbols */
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static int warn_unresolved = 0;
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/* How a symbol is exported */
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enum export {
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export_plain, export_unused, export_gpl,
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export_unused_gpl, export_gpl_future, export_unknown
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};
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void 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 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 merror(const char *fmt, ...)
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{
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va_list arglist;
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fprintf(stderr, "ERROR: ");
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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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static int 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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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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static struct module *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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static struct module *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->gpl_compatible = -1;
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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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unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
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unsigned int kernel:1; /* 1 if symbol is from kernel
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* (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];
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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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/**
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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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**/
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static struct symbol *alloc_symbol(const char *name, unsigned int weak,
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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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static struct symbol *new_symbol(const char *name, struct module *module,
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enum export export)
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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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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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{
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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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static struct {
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const char *str;
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enum export export;
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} export_list[] = {
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{ .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 },
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{ .str = "(unknown)", .export = export_unknown },
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};
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static const char *export_str(enum export ex)
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{
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return export_list[ex].str;
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}
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static enum export export_no(const char * s)
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{
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int i;
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if (!s)
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return export_unknown;
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for (i = 0; export_list[i].export != export_unknown; i++) {
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if (strcmp(export_list[i].str, s) == 0)
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return export_list[i].export;
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}
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return export_unknown;
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}
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static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
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{
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if (sec == elf->export_sec)
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return export_plain;
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else if (sec == elf->export_unused_sec)
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return export_unused;
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else if (sec == elf->export_gpl_sec)
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return export_gpl;
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else if (sec == elf->export_unused_gpl_sec)
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return export_unused_gpl;
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else if (sec == elf->export_gpl_future_sec)
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return export_gpl_future;
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else
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return export_unknown;
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}
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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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**/
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static struct symbol *sym_add_exported(const char *name, struct module *mod,
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enum export export)
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{
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struct symbol *s = find_symbol(name);
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if (!s) {
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s = new_symbol(name, mod, export);
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} else {
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if (!s->preloaded) {
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warn("%s: '%s' exported twice. Previous export "
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"was in %s%s\n", mod->name, name,
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s->module->name,
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is_vmlinux(s->module->name) ?"":".ko");
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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);
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s->kernel = 0;
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s->export = export;
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return s;
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}
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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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{
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struct symbol *s = find_symbol(name);
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if (!s)
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s = new_symbol(name, mod, export);
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s->crc = crc;
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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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{
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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* 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 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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static int 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;
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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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exit(1);
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}
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info->hdr = hdr;
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if (info->size < sizeof(*hdr)) {
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/* file too small, assume this is an empty .o file */
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return 0;
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}
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/* Is this a valid ELF file? */
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if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
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(hdr->e_ident[EI_MAG1] != ELFMAG1) ||
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(hdr->e_ident[EI_MAG2] != ELFMAG2) ||
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(hdr->e_ident[EI_MAG3] != ELFMAG3)) {
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/* Not an ELF file - silently ignore it */
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return 0;
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}
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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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hdr->e_type = TO_NATIVE(hdr->e_type);
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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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sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
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sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
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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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const char *secname;
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if (sechdrs[i].sh_offset > info->size) {
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fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr));
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return 0;
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}
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secname = secstrings + sechdrs[i].sh_name;
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if (strcmp(secname, ".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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} else if (strcmp(secname, "__ksymtab") == 0)
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info->export_sec = i;
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else if (strcmp(secname, "__ksymtab_unused") == 0)
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info->export_unused_sec = i;
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else if (strcmp(secname, "__ksymtab_gpl") == 0)
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info->export_gpl_sec = i;
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else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
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info->export_unused_gpl_sec = i;
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else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
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info->export_gpl_future_sec = i;
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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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fatal("%s has no symtab?\n", filename);
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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 1;
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}
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static void 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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static void 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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enum export export = export_from_sec(info, sym->st_shndx);
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switch (sym->st_shndx) {
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case SHN_COMMON:
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warn("\"%s\" [%s] is COMMON symbol\n", 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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sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
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export);
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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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if (symname[0] == '.') {
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char *munged = strdup(symname);
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munged[0] = '_';
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munged[1] = toupper(munged[1]);
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symname = munged;
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}
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}
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#endif
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|
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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;
|
|
default:
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/* All exported symbols */
|
|
if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
|
|
sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
|
|
export);
|
|
}
|
|
if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
|
|
mod->has_init = 1;
|
|
if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
|
|
mod->has_cleanup = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse tag=value strings from .modinfo section
|
|
**/
|
|
static char *next_string(char *string, unsigned long *secsize)
|
|
{
|
|
/* Skip non-zero chars */
|
|
while (string[0]) {
|
|
string++;
|
|
if ((*secsize)-- <= 1)
|
|
return NULL;
|
|
}
|
|
|
|
/* Skip any zero padding. */
|
|
while (!string[0]) {
|
|
string++;
|
|
if ((*secsize)-- <= 1)
|
|
return NULL;
|
|
}
|
|
return string;
|
|
}
|
|
|
|
static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
|
|
const char *tag, char *info)
|
|
{
|
|
char *p;
|
|
unsigned int taglen = strlen(tag);
|
|
unsigned long size = modinfo_len;
|
|
|
|
if (info) {
|
|
size -= info - (char *)modinfo;
|
|
modinfo = next_string(info, &size);
|
|
}
|
|
|
|
for (p = modinfo; p; p = next_string(p, &size)) {
|
|
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
|
|
return p + taglen + 1;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
|
|
const char *tag)
|
|
|
|
{
|
|
return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
|
|
}
|
|
|
|
/**
|
|
* Test if string s ends in string sub
|
|
* return 0 if match
|
|
**/
|
|
static int strrcmp(const char *s, const char *sub)
|
|
{
|
|
int slen, sublen;
|
|
|
|
if (!s || !sub)
|
|
return 1;
|
|
|
|
slen = strlen(s);
|
|
sublen = strlen(sub);
|
|
|
|
if ((slen == 0) || (sublen == 0))
|
|
return 1;
|
|
|
|
if (sublen > slen)
|
|
return 1;
|
|
|
|
return memcmp(s + slen - sublen, sub, sublen);
|
|
}
|
|
|
|
/**
|
|
* Whitelist to allow certain references to pass with no warning.
|
|
*
|
|
* Pattern 0:
|
|
* Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
|
|
* The pattern is identified by:
|
|
* fromsec = .text.init.refok | .data.init.refok
|
|
*
|
|
* Pattern 1:
|
|
* If a module parameter is declared __initdata and permissions=0
|
|
* then this is legal despite the warning generated.
|
|
* We cannot see value of permissions here, so just ignore
|
|
* this pattern.
|
|
* The pattern is identified by:
|
|
* tosec = .init.data
|
|
* fromsec = .data*
|
|
* atsym =__param*
|
|
*
|
|
* Pattern 2:
|
|
* Many drivers utilise a *driver container with references to
|
|
* add, remove, probe functions etc.
|
|
* These functions may often be marked __init and we do not want to
|
|
* warn here.
|
|
* the pattern is identified by:
|
|
* tosec = .init.text | .exit.text | .init.data
|
|
* fromsec = .data
|
|
* atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console
|
|
*
|
|
* Pattern 3:
|
|
* Whitelist all references from .pci_fixup* section to .init.text
|
|
* This is part of the PCI init when built-in
|
|
*
|
|
* Pattern 4:
|
|
* Whitelist all refereces from .text.head to .init.data
|
|
* Whitelist all refereces from .text.head to .init.text
|
|
*
|
|
* Pattern 5:
|
|
* Some symbols belong to init section but still it is ok to reference
|
|
* these from non-init sections as these symbols don't have any memory
|
|
* allocated for them and symbol address and value are same. So even
|
|
* if init section is freed, its ok to reference those symbols.
|
|
* For ex. symbols marking the init section boundaries.
|
|
* This pattern is identified by
|
|
* refsymname = __init_begin, _sinittext, _einittext
|
|
*
|
|
* Pattern 7:
|
|
* Logos used in drivers/video/logo reside in __initdata but the
|
|
* funtion that references them are EXPORT_SYMBOL() so cannot be
|
|
* marker __init. So we whitelist them here.
|
|
* The pattern is:
|
|
* tosec = .init.data
|
|
* fromsec = .text*
|
|
* refsymname = logo_
|
|
*
|
|
* Pattern 8:
|
|
* Symbols contained in .paravirtprobe may safely reference .init.text.
|
|
* The pattern is:
|
|
* tosec = .init.text
|
|
* fromsec = .paravirtprobe
|
|
*
|
|
* Pattern 10:
|
|
* ia64 has machvec table for each platform and
|
|
* powerpc has a machine desc table for each platform.
|
|
* It is mixture of function pointers of .init.text and .text.
|
|
* fromsec = .machvec | .machine.desc
|
|
**/
|
|
static int secref_whitelist(const char *modname, const char *tosec,
|
|
const char *fromsec, const char *atsym,
|
|
const char *refsymname)
|
|
{
|
|
int f1 = 1, f2 = 1;
|
|
const char **s;
|
|
const char *pat2sym[] = {
|
|
"driver",
|
|
"_template", /* scsi uses *_template a lot */
|
|
"_sht", /* scsi also used *_sht to some extent */
|
|
"_ops",
|
|
"_probe",
|
|
"_probe_one",
|
|
"_console",
|
|
"apic_es7000",
|
|
NULL
|
|
};
|
|
|
|
const char *pat3refsym[] = {
|
|
"__init_begin",
|
|
"_sinittext",
|
|
"_einittext",
|
|
NULL
|
|
};
|
|
|
|
/* Check for pattern 0 */
|
|
if ((strcmp(fromsec, ".text.init.refok") == 0) ||
|
|
(strcmp(fromsec, ".data.init.refok") == 0))
|
|
return 1;
|
|
|
|
/* Check for pattern 1 */
|
|
if (strcmp(tosec, ".init.data") != 0)
|
|
f1 = 0;
|
|
if (strncmp(fromsec, ".data", strlen(".data")) != 0)
|
|
f1 = 0;
|
|
if (strncmp(atsym, "__param", strlen("__param")) != 0)
|
|
f1 = 0;
|
|
|
|
if (f1)
|
|
return f1;
|
|
|
|
/* Check for pattern 2 */
|
|
if ((strcmp(tosec, ".init.text") != 0) &&
|
|
(strcmp(tosec, ".exit.text") != 0) &&
|
|
(strcmp(tosec, ".init.data") != 0))
|
|
f2 = 0;
|
|
if (strcmp(fromsec, ".data") != 0)
|
|
f2 = 0;
|
|
|
|
for (s = pat2sym; *s; s++)
|
|
if (strrcmp(atsym, *s) == 0)
|
|
f1 = 1;
|
|
if (f1 && f2)
|
|
return 1;
|
|
|
|
/* Check for pattern 3 */
|
|
if ((strncmp(fromsec, ".pci_fixup", strlen(".pci_fixup")) == 0) &&
|
|
(strcmp(tosec, ".init.text") == 0))
|
|
return 1;
|
|
|
|
/* Check for pattern 4 */
|
|
if ((strcmp(fromsec, ".text.head") == 0) &&
|
|
((strcmp(tosec, ".init.data") == 0) ||
|
|
(strcmp(tosec, ".init.text") == 0)))
|
|
return 1;
|
|
|
|
/* Check for pattern 5 */
|
|
for (s = pat3refsym; *s; s++)
|
|
if (strcmp(refsymname, *s) == 0)
|
|
return 1;
|
|
|
|
/* Check for pattern 7 */
|
|
if ((strcmp(tosec, ".init.data") == 0) &&
|
|
(strncmp(fromsec, ".text", strlen(".text")) == 0) &&
|
|
(strncmp(refsymname, "logo_", strlen("logo_")) == 0))
|
|
return 1;
|
|
|
|
/* Check for pattern 8 */
|
|
if ((strcmp(tosec, ".init.text") == 0) &&
|
|
(strcmp(fromsec, ".paravirtprobe") == 0))
|
|
return 1;
|
|
|
|
/* Check for pattern 10 */
|
|
if ((strcmp(fromsec, ".machvec") == 0) ||
|
|
(strcmp(fromsec, ".machine.desc") == 0))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Find symbol based on relocation record info.
|
|
* In some cases the symbol supplied is a valid symbol so
|
|
* return refsym. If st_name != 0 we assume this is a valid symbol.
|
|
* In other cases the symbol needs to be looked up in the symbol table
|
|
* based on section and address.
|
|
* **/
|
|
static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
|
|
Elf_Sym *relsym)
|
|
{
|
|
Elf_Sym *sym;
|
|
|
|
if (relsym->st_name != 0)
|
|
return relsym;
|
|
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
|
|
if (sym->st_shndx != relsym->st_shndx)
|
|
continue;
|
|
if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
|
|
continue;
|
|
if (sym->st_value == addr)
|
|
return sym;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static inline int is_arm_mapping_symbol(const char *str)
|
|
{
|
|
return str[0] == '$' && strchr("atd", str[1])
|
|
&& (str[2] == '\0' || str[2] == '.');
|
|
}
|
|
|
|
/*
|
|
* If there's no name there, ignore it; likewise, ignore it if it's
|
|
* one of the magic symbols emitted used by current ARM tools.
|
|
*
|
|
* Otherwise if find_symbols_between() returns those symbols, they'll
|
|
* fail the whitelist tests and cause lots of false alarms ... fixable
|
|
* only by merging __exit and __init sections into __text, bloating
|
|
* the kernel (which is especially evil on embedded platforms).
|
|
*/
|
|
static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
|
|
{
|
|
const char *name = elf->strtab + sym->st_name;
|
|
|
|
if (!name || !strlen(name))
|
|
return 0;
|
|
return !is_arm_mapping_symbol(name);
|
|
}
|
|
|
|
/*
|
|
* Find symbols before or equal addr and after addr - in the section sec.
|
|
* If we find two symbols with equal offset prefer one with a valid name.
|
|
* The ELF format may have a better way to detect what type of symbol
|
|
* it is, but this works for now.
|
|
**/
|
|
static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
|
|
const char *sec,
|
|
Elf_Sym **before, Elf_Sym **after)
|
|
{
|
|
Elf_Sym *sym;
|
|
Elf_Ehdr *hdr = elf->hdr;
|
|
Elf_Addr beforediff = ~0;
|
|
Elf_Addr afterdiff = ~0;
|
|
const char *secstrings = (void *)hdr +
|
|
elf->sechdrs[hdr->e_shstrndx].sh_offset;
|
|
|
|
*before = NULL;
|
|
*after = NULL;
|
|
|
|
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
|
|
const char *symsec;
|
|
|
|
if (sym->st_shndx >= SHN_LORESERVE)
|
|
continue;
|
|
symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name;
|
|
if (strcmp(symsec, sec) != 0)
|
|
continue;
|
|
if (!is_valid_name(elf, sym))
|
|
continue;
|
|
if (sym->st_value <= addr) {
|
|
if ((addr - sym->st_value) < beforediff) {
|
|
beforediff = addr - sym->st_value;
|
|
*before = sym;
|
|
}
|
|
else if ((addr - sym->st_value) == beforediff) {
|
|
*before = sym;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ((sym->st_value - addr) < afterdiff) {
|
|
afterdiff = sym->st_value - addr;
|
|
*after = sym;
|
|
}
|
|
else if ((sym->st_value - addr) == afterdiff) {
|
|
*after = sym;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Print a warning about a section mismatch.
|
|
* Try to find symbols near it so user can find it.
|
|
* Check whitelist before warning - it may be a false positive.
|
|
**/
|
|
static void warn_sec_mismatch(const char *modname, const char *fromsec,
|
|
struct elf_info *elf, Elf_Sym *sym, Elf_Rela r)
|
|
{
|
|
const char *refsymname = "";
|
|
Elf_Sym *before, *after;
|
|
Elf_Sym *refsym;
|
|
Elf_Ehdr *hdr = elf->hdr;
|
|
Elf_Shdr *sechdrs = elf->sechdrs;
|
|
const char *secstrings = (void *)hdr +
|
|
sechdrs[hdr->e_shstrndx].sh_offset;
|
|
const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name;
|
|
|
|
find_symbols_between(elf, r.r_offset, fromsec, &before, &after);
|
|
|
|
refsym = find_elf_symbol(elf, r.r_addend, sym);
|
|
if (refsym && strlen(elf->strtab + refsym->st_name))
|
|
refsymname = elf->strtab + refsym->st_name;
|
|
|
|
/* check whitelist - we may ignore it */
|
|
if (before &&
|
|
secref_whitelist(modname, secname, fromsec,
|
|
elf->strtab + before->st_name, refsymname))
|
|
return;
|
|
|
|
/* fromsec whitelist - without a valid 'before'
|
|
* powerpc has a GOT table in .got2 section
|
|
* and also a .toc section */
|
|
if (strcmp(fromsec, ".got2") == 0)
|
|
return;
|
|
if (strcmp(fromsec, ".toc") == 0)
|
|
return;
|
|
|
|
if (before && after) {
|
|
warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
|
|
"(between '%s' and '%s')\n",
|
|
modname, fromsec, (unsigned long long)r.r_offset,
|
|
secname, refsymname,
|
|
elf->strtab + before->st_name,
|
|
elf->strtab + after->st_name);
|
|
} else if (before) {
|
|
warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
|
|
"(after '%s')\n",
|
|
modname, fromsec, (unsigned long long)r.r_offset,
|
|
secname, refsymname,
|
|
elf->strtab + before->st_name);
|
|
} else if (after) {
|
|
warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
|
|
"before '%s' (at offset -0x%llx)\n",
|
|
modname, fromsec, (unsigned long long)r.r_offset,
|
|
secname, refsymname,
|
|
elf->strtab + after->st_name);
|
|
} else {
|
|
warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n",
|
|
modname, fromsec, (unsigned long long)r.r_offset,
|
|
secname, refsymname);
|
|
}
|
|
}
|
|
|
|
static unsigned int *reloc_location(struct elf_info *elf,
|
|
int rsection, Elf_Rela *r)
|
|
{
|
|
Elf_Shdr *sechdrs = elf->sechdrs;
|
|
int section = sechdrs[rsection].sh_info;
|
|
|
|
return (void *)elf->hdr + sechdrs[section].sh_offset +
|
|
(r->r_offset - sechdrs[section].sh_addr);
|
|
}
|
|
|
|
static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
|
|
{
|
|
unsigned int r_typ = ELF_R_TYPE(r->r_info);
|
|
unsigned int *location = reloc_location(elf, rsection, r);
|
|
|
|
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;
|
|
}
|
|
|
|
static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
|
|
{
|
|
unsigned int r_typ = ELF_R_TYPE(r->r_info);
|
|
|
|
switch (r_typ) {
|
|
case R_ARM_ABS32:
|
|
/* From ARM ABI: (S + A) | T */
|
|
r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info));
|
|
break;
|
|
case R_ARM_PC24:
|
|
/* From ARM ABI: ((S + A) | T) - P */
|
|
r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset +
|
|
(r->r_offset - elf->sechdrs[rsection].sh_addr));
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
|
|
{
|
|
unsigned int r_typ = ELF_R_TYPE(r->r_info);
|
|
unsigned int *location = reloc_location(elf, rsection, r);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* A module includes a number of sections that are discarded
|
|
* either when loaded or when used as built-in.
|
|
* For loaded modules all functions marked __init and all data
|
|
* marked __initdata will be discarded when the module has been intialized.
|
|
* Likewise for modules used built-in the sections marked __exit
|
|
* are discarded because __exit marked function are supposed to be called
|
|
* only when a moduel is unloaded which never happes for built-in modules.
|
|
* The check_sec_ref() function traverses all relocation records
|
|
* to find all references to a section that reference a section that will
|
|
* be discarded and warns about it.
|
|
**/
|
|
static void check_sec_ref(struct module *mod, const char *modname,
|
|
struct elf_info *elf,
|
|
int section(const char*),
|
|
int section_ref_ok(const char *))
|
|
{
|
|
int i;
|
|
Elf_Sym *sym;
|
|
Elf_Ehdr *hdr = elf->hdr;
|
|
Elf_Shdr *sechdrs = elf->sechdrs;
|
|
const char *secstrings = (void *)hdr +
|
|
sechdrs[hdr->e_shstrndx].sh_offset;
|
|
|
|
/* Walk through all sections */
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
const char *name = secstrings + sechdrs[i].sh_name;
|
|
const char *secname;
|
|
Elf_Rela r;
|
|
unsigned int r_sym;
|
|
/* We want to process only relocation sections and not .init */
|
|
if (sechdrs[i].sh_type == SHT_RELA) {
|
|
Elf_Rela *rela;
|
|
Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
|
|
Elf_Rela *stop = (void*)start + sechdrs[i].sh_size;
|
|
name += strlen(".rela");
|
|
if (section_ref_ok(name))
|
|
continue;
|
|
|
|
for (rela = start; rela < stop; rela++) {
|
|
r.r_offset = TO_NATIVE(rela->r_offset);
|
|
#if KERNEL_ELFCLASS == ELFCLASS64
|
|
if (hdr->e_machine == EM_MIPS) {
|
|
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 */
|
|
if (sym->st_shndx >= SHN_LORESERVE)
|
|
continue;
|
|
|
|
secname = secstrings +
|
|
sechdrs[sym->st_shndx].sh_name;
|
|
if (section(secname))
|
|
warn_sec_mismatch(modname, name,
|
|
elf, sym, r);
|
|
}
|
|
} else if (sechdrs[i].sh_type == SHT_REL) {
|
|
Elf_Rel *rel;
|
|
Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset;
|
|
Elf_Rel *stop = (void*)start + sechdrs[i].sh_size;
|
|
name += strlen(".rel");
|
|
if (section_ref_ok(name))
|
|
continue;
|
|
|
|
for (rel = start; rel < stop; rel++) {
|
|
r.r_offset = TO_NATIVE(rel->r_offset);
|
|
#if KERNEL_ELFCLASS == ELFCLASS64
|
|
if (hdr->e_machine == EM_MIPS) {
|
|
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;
|
|
switch (hdr->e_machine) {
|
|
case EM_386:
|
|
if (addend_386_rel(elf, i, &r))
|
|
continue;
|
|
break;
|
|
case EM_ARM:
|
|
if(addend_arm_rel(elf, i, &r))
|
|
continue;
|
|
break;
|
|
case EM_MIPS:
|
|
if (addend_mips_rel(elf, i, &r))
|
|
continue;
|
|
break;
|
|
}
|
|
sym = elf->symtab_start + r_sym;
|
|
/* Skip special sections */
|
|
if (sym->st_shndx >= SHN_LORESERVE)
|
|
continue;
|
|
|
|
secname = secstrings +
|
|
sechdrs[sym->st_shndx].sh_name;
|
|
if (section(secname))
|
|
warn_sec_mismatch(modname, name,
|
|
elf, sym, r);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Functions used only during module init is marked __init and is stored in
|
|
* a .init.text section. Likewise data is marked __initdata and stored in
|
|
* a .init.data section.
|
|
* If this section is one of these sections return 1
|
|
* See include/linux/init.h for the details
|
|
**/
|
|
static int init_section(const char *name)
|
|
{
|
|
if (strcmp(name, ".init") == 0)
|
|
return 1;
|
|
if (strncmp(name, ".init.", strlen(".init.")) == 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Identify sections from which references to a .init section is OK.
|
|
*
|
|
* Unfortunately references to read only data that referenced .init
|
|
* sections had to be excluded. Almost all of these are false
|
|
* positives, they are created by gcc. The downside of excluding rodata
|
|
* is that there really are some user references from rodata to
|
|
* init code, e.g. drivers/video/vgacon.c:
|
|
*
|
|
* const struct consw vga_con = {
|
|
* con_startup: vgacon_startup,
|
|
*
|
|
* where vgacon_startup is __init. If you want to wade through the false
|
|
* positives, take out the check for rodata.
|
|
**/
|
|
static int init_section_ref_ok(const char *name)
|
|
{
|
|
const char **s;
|
|
/* Absolute section names */
|
|
const char *namelist1[] = {
|
|
".init",
|
|
".opd", /* see comment [OPD] at exit_section_ref_ok() */
|
|
".toc1", /* used by ppc64 */
|
|
".stab",
|
|
".data.rel.ro", /* used by parisc64 */
|
|
".parainstructions",
|
|
".text.lock",
|
|
"__bug_table", /* used by powerpc for BUG() */
|
|
".pci_fixup_header",
|
|
".pci_fixup_final",
|
|
".pdr",
|
|
"__param",
|
|
"__ex_table",
|
|
".fixup",
|
|
".smp_locks",
|
|
".plt", /* seen on ARCH=um build on x86_64. Harmless */
|
|
"__ftr_fixup", /* powerpc cpu feature fixup */
|
|
"__fw_ftr_fixup", /* powerpc firmware feature fixup */
|
|
".cranges", /* used by sh64 */
|
|
NULL
|
|
};
|
|
/* Start of section names */
|
|
const char *namelist2[] = {
|
|
".init.",
|
|
".altinstructions",
|
|
".eh_frame",
|
|
".debug",
|
|
".parainstructions",
|
|
".rodata",
|
|
NULL
|
|
};
|
|
/* part of section name */
|
|
const char *namelist3 [] = {
|
|
".unwind", /* sample: IA_64.unwind.init.text */
|
|
NULL
|
|
};
|
|
|
|
for (s = namelist1; *s; s++)
|
|
if (strcmp(*s, name) == 0)
|
|
return 1;
|
|
for (s = namelist2; *s; s++)
|
|
if (strncmp(*s, name, strlen(*s)) == 0)
|
|
return 1;
|
|
for (s = namelist3; *s; s++)
|
|
if (strstr(name, *s) != NULL)
|
|
return 1;
|
|
if (strrcmp(name, ".init") == 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Functions used only during module exit is marked __exit and is stored in
|
|
* a .exit.text section. Likewise data is marked __exitdata and stored in
|
|
* a .exit.data section.
|
|
* If this section is one of these sections return 1
|
|
* See include/linux/init.h for the details
|
|
**/
|
|
static int exit_section(const char *name)
|
|
{
|
|
if (strcmp(name, ".exit.text") == 0)
|
|
return 1;
|
|
if (strcmp(name, ".exit.data") == 0)
|
|
return 1;
|
|
return 0;
|
|
|
|
}
|
|
|
|
/*
|
|
* Identify sections from which references to a .exit section is OK.
|
|
*
|
|
* [OPD] Keith Ownes <kaos@sgi.com> commented:
|
|
* For our future {in}sanity, add a comment that this is the ppc .opd
|
|
* section, not the ia64 .opd section.
|
|
* ia64 .opd should not point to discarded sections.
|
|
* [.rodata] like for .init.text we ignore .rodata references -same reason
|
|
**/
|
|
static int exit_section_ref_ok(const char *name)
|
|
{
|
|
const char **s;
|
|
/* Absolute section names */
|
|
const char *namelist1[] = {
|
|
".exit.text",
|
|
".exit.data",
|
|
".init.text",
|
|
".rodata",
|
|
".opd", /* See comment [OPD] */
|
|
".toc1", /* used by ppc64 */
|
|
".altinstructions",
|
|
".pdr",
|
|
"__bug_table", /* used by powerpc for BUG() */
|
|
".exitcall.exit",
|
|
".eh_frame",
|
|
".parainstructions",
|
|
".stab",
|
|
"__ex_table",
|
|
".fixup",
|
|
".smp_locks",
|
|
".plt", /* seen on ARCH=um build on x86_64. Harmless */
|
|
".cranges", /* used by sh64 */
|
|
NULL
|
|
};
|
|
/* Start of section names */
|
|
const char *namelist2[] = {
|
|
".debug",
|
|
NULL
|
|
};
|
|
/* part of section name */
|
|
const char *namelist3 [] = {
|
|
".unwind", /* Sample: IA_64.unwind.exit.text */
|
|
NULL
|
|
};
|
|
|
|
for (s = namelist1; *s; s++)
|
|
if (strcmp(*s, name) == 0)
|
|
return 1;
|
|
for (s = namelist2; *s; s++)
|
|
if (strncmp(*s, name, strlen(*s)) == 0)
|
|
return 1;
|
|
for (s = namelist3; *s; s++)
|
|
if (strstr(name, *s) != NULL)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void read_symbols(char *modname)
|
|
{
|
|
const char *symname;
|
|
char *version;
|
|
char *license;
|
|
struct module *mod;
|
|
struct elf_info info = { };
|
|
Elf_Sym *sym;
|
|
|
|
if (!parse_elf(&info, modname))
|
|
return;
|
|
|
|
mod = new_module(modname);
|
|
|
|
/* When there's no vmlinux, don't print warnings about
|
|
* unresolved symbols (since there'll be too many ;) */
|
|
if (is_vmlinux(modname)) {
|
|
have_vmlinux = 1;
|
|
mod->skip = 1;
|
|
}
|
|
|
|
license = get_modinfo(info.modinfo, info.modinfo_len, "license");
|
|
while (license) {
|
|
if (license_is_gpl_compatible(license))
|
|
mod->gpl_compatible = 1;
|
|
else {
|
|
mod->gpl_compatible = 0;
|
|
break;
|
|
}
|
|
license = get_next_modinfo(info.modinfo, info.modinfo_len,
|
|
"license", license);
|
|
}
|
|
|
|
for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
|
|
symname = info.strtab + sym->st_name;
|
|
|
|
handle_modversions(mod, &info, sym, symname);
|
|
handle_moddevtable(mod, &info, sym, symname);
|
|
}
|
|
check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok);
|
|
check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok);
|
|
|
|
version = get_modinfo(info.modinfo, info.modinfo_len, "version");
|
|
if (version)
|
|
maybe_frob_rcs_version(modname, version, info.modinfo,
|
|
version - (char *)info.hdr);
|
|
if (version || (all_versions && !is_vmlinux(modname)))
|
|
get_src_version(modname, mod->srcversion,
|
|
sizeof(mod->srcversion)-1);
|
|
|
|
parse_elf_finish(&info);
|
|
|
|
/* Our trick to get versioning for struct_module - it's
|
|
* never passed as an argument to an exported function, so
|
|
* the automatic versioning doesn't pick it up, but it's really
|
|
* important anyhow */
|
|
if (modversions)
|
|
mod->unres = alloc_symbol("struct_module", 0, mod->unres);
|
|
}
|
|
|
|
#define SZ 500
|
|
|
|
/* We first write the generated file into memory using the
|
|
* following helper, then compare to the file on disk and
|
|
* only update the later if anything changed */
|
|
|
|
void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
|
|
const char *fmt, ...)
|
|
{
|
|
char tmp[SZ];
|
|
int len;
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
len = vsnprintf(tmp, SZ, fmt, ap);
|
|
buf_write(buf, tmp, len);
|
|
va_end(ap);
|
|
}
|
|
|
|
void buf_write(struct buffer *buf, const char *s, int len)
|
|
{
|
|
if (buf->size - buf->pos < len) {
|
|
buf->size += len + SZ;
|
|
buf->p = realloc(buf->p, buf->size);
|
|
}
|
|
strncpy(buf->p + buf->pos, s, len);
|
|
buf->pos += len;
|
|
}
|
|
|
|
static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
|
|
{
|
|
const char *e = is_vmlinux(m) ?"":".ko";
|
|
|
|
switch (exp) {
|
|
case export_gpl:
|
|
fatal("modpost: GPL-incompatible module %s%s "
|
|
"uses GPL-only symbol '%s'\n", m, e, s);
|
|
break;
|
|
case export_unused_gpl:
|
|
fatal("modpost: GPL-incompatible module %s%s "
|
|
"uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
|
|
break;
|
|
case export_gpl_future:
|
|
warn("modpost: GPL-incompatible module %s%s "
|
|
"uses future GPL-only symbol '%s'\n", m, e, s);
|
|
break;
|
|
case export_plain:
|
|
case export_unused:
|
|
case export_unknown:
|
|
/* ignore */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void check_for_unused(enum export exp, const char* m, const char* s)
|
|
{
|
|
const char *e = is_vmlinux(m) ?"":".ko";
|
|
|
|
switch (exp) {
|
|
case export_unused:
|
|
case export_unused_gpl:
|
|
warn("modpost: module %s%s "
|
|
"uses symbol '%s' marked UNUSED\n", m, e, s);
|
|
break;
|
|
default:
|
|
/* ignore */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void check_exports(struct module *mod)
|
|
{
|
|
struct symbol *s, *exp;
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
const char *basename;
|
|
exp = find_symbol(s->name);
|
|
if (!exp || exp->module == mod)
|
|
continue;
|
|
basename = strrchr(mod->name, '/');
|
|
if (basename)
|
|
basename++;
|
|
else
|
|
basename = mod->name;
|
|
if (!mod->gpl_compatible)
|
|
check_for_gpl_usage(exp->export, basename, exp->name);
|
|
check_for_unused(exp->export, basename, exp->name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Header for the generated file
|
|
**/
|
|
static void add_header(struct buffer *b, struct module *mod)
|
|
{
|
|
buf_printf(b, "#include <linux/module.h>\n");
|
|
buf_printf(b, "#include <linux/vermagic.h>\n");
|
|
buf_printf(b, "#include <linux/compiler.h>\n");
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "struct module __this_module\n");
|
|
buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
|
|
buf_printf(b, " .name = KBUILD_MODNAME,\n");
|
|
if (mod->has_init)
|
|
buf_printf(b, " .init = init_module,\n");
|
|
if (mod->has_cleanup)
|
|
buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
|
|
" .exit = cleanup_module,\n"
|
|
"#endif\n");
|
|
buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
|
|
buf_printf(b, "};\n");
|
|
}
|
|
|
|
/**
|
|
* Record CRCs for unresolved symbols
|
|
**/
|
|
static int add_versions(struct buffer *b, struct module *mod)
|
|
{
|
|
struct symbol *s, *exp;
|
|
int err = 0;
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
exp = find_symbol(s->name);
|
|
if (!exp || exp->module == mod) {
|
|
if (have_vmlinux && !s->weak) {
|
|
if (warn_unresolved) {
|
|
warn("\"%s\" [%s.ko] undefined!\n",
|
|
s->name, mod->name);
|
|
} else {
|
|
merror("\"%s\" [%s.ko] undefined!\n",
|
|
s->name, mod->name);
|
|
err = 1;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
s->module = exp->module;
|
|
s->crc_valid = exp->crc_valid;
|
|
s->crc = exp->crc;
|
|
}
|
|
|
|
if (!modversions)
|
|
return err;
|
|
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "static const struct modversion_info ____versions[]\n");
|
|
buf_printf(b, "__attribute_used__\n");
|
|
buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
if (!s->module) {
|
|
continue;
|
|
}
|
|
if (!s->crc_valid) {
|
|
warn("\"%s\" [%s.ko] has no CRC!\n",
|
|
s->name, mod->name);
|
|
continue;
|
|
}
|
|
buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
|
|
}
|
|
|
|
buf_printf(b, "};\n");
|
|
|
|
return err;
|
|
}
|
|
|
|
static void add_depends(struct buffer *b, struct module *mod,
|
|
struct module *modules)
|
|
{
|
|
struct symbol *s;
|
|
struct module *m;
|
|
int first = 1;
|
|
|
|
for (m = modules; m; m = m->next) {
|
|
m->seen = is_vmlinux(m->name);
|
|
}
|
|
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "static const char __module_depends[]\n");
|
|
buf_printf(b, "__attribute_used__\n");
|
|
buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
|
|
buf_printf(b, "\"depends=");
|
|
for (s = mod->unres; s; s = s->next) {
|
|
const char *p;
|
|
if (!s->module)
|
|
continue;
|
|
|
|
if (s->module->seen)
|
|
continue;
|
|
|
|
s->module->seen = 1;
|
|
if ((p = strrchr(s->module->name, '/')) != NULL)
|
|
p++;
|
|
else
|
|
p = s->module->name;
|
|
buf_printf(b, "%s%s", first ? "" : ",", p);
|
|
first = 0;
|
|
}
|
|
buf_printf(b, "\";\n");
|
|
}
|
|
|
|
static void add_srcversion(struct buffer *b, struct module *mod)
|
|
{
|
|
if (mod->srcversion[0]) {
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
|
|
mod->srcversion);
|
|
}
|
|
}
|
|
|
|
static void write_if_changed(struct buffer *b, const char *fname)
|
|
{
|
|
char *tmp;
|
|
FILE *file;
|
|
struct stat st;
|
|
|
|
file = fopen(fname, "r");
|
|
if (!file)
|
|
goto write;
|
|
|
|
if (fstat(fileno(file), &st) < 0)
|
|
goto close_write;
|
|
|
|
if (st.st_size != b->pos)
|
|
goto close_write;
|
|
|
|
tmp = NOFAIL(malloc(b->pos));
|
|
if (fread(tmp, 1, b->pos, file) != b->pos)
|
|
goto free_write;
|
|
|
|
if (memcmp(tmp, b->p, b->pos) != 0)
|
|
goto free_write;
|
|
|
|
free(tmp);
|
|
fclose(file);
|
|
return;
|
|
|
|
free_write:
|
|
free(tmp);
|
|
close_write:
|
|
fclose(file);
|
|
write:
|
|
file = fopen(fname, "w");
|
|
if (!file) {
|
|
perror(fname);
|
|
exit(1);
|
|
}
|
|
if (fwrite(b->p, 1, b->pos, file) != b->pos) {
|
|
perror(fname);
|
|
exit(1);
|
|
}
|
|
fclose(file);
|
|
}
|
|
|
|
/* parse Module.symvers file. line format:
|
|
* 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
|
|
**/
|
|
static void read_dump(const char *fname, unsigned int kernel)
|
|
{
|
|
unsigned long size, pos = 0;
|
|
void *file = grab_file(fname, &size);
|
|
char *line;
|
|
|
|
if (!file)
|
|
/* No symbol versions, silently ignore */
|
|
return;
|
|
|
|
while ((line = get_next_line(&pos, file, size))) {
|
|
char *symname, *modname, *d, *export, *end;
|
|
unsigned int crc;
|
|
struct module *mod;
|
|
struct symbol *s;
|
|
|
|
if (!(symname = strchr(line, '\t')))
|
|
goto fail;
|
|
*symname++ = '\0';
|
|
if (!(modname = strchr(symname, '\t')))
|
|
goto fail;
|
|
*modname++ = '\0';
|
|
if ((export = strchr(modname, '\t')) != NULL)
|
|
*export++ = '\0';
|
|
if (export && ((end = strchr(export, '\t')) != NULL))
|
|
*end = '\0';
|
|
crc = strtoul(line, &d, 16);
|
|
if (*symname == '\0' || *modname == '\0' || *d != '\0')
|
|
goto fail;
|
|
|
|
if (!(mod = find_module(modname))) {
|
|
if (is_vmlinux(modname)) {
|
|
have_vmlinux = 1;
|
|
}
|
|
mod = new_module(NOFAIL(strdup(modname)));
|
|
mod->skip = 1;
|
|
}
|
|
s = sym_add_exported(symname, mod, export_no(export));
|
|
s->kernel = kernel;
|
|
s->preloaded = 1;
|
|
sym_update_crc(symname, mod, crc, export_no(export));
|
|
}
|
|
return;
|
|
fail:
|
|
fatal("parse error in symbol dump file\n");
|
|
}
|
|
|
|
/* For normal builds always dump all symbols.
|
|
* For external modules only dump symbols
|
|
* that are not read from kernel Module.symvers.
|
|
**/
|
|
static int dump_sym(struct symbol *sym)
|
|
{
|
|
if (!external_module)
|
|
return 1;
|
|
if (sym->vmlinux || sym->kernel)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static void write_dump(const char *fname)
|
|
{
|
|
struct buffer buf = { };
|
|
struct symbol *symbol;
|
|
int n;
|
|
|
|
for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
|
|
symbol = symbolhash[n];
|
|
while (symbol) {
|
|
if (dump_sym(symbol))
|
|
buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
|
|
symbol->crc, symbol->name,
|
|
symbol->module->name,
|
|
export_str(symbol->export));
|
|
symbol = symbol->next;
|
|
}
|
|
}
|
|
write_if_changed(&buf, fname);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct module *mod;
|
|
struct buffer buf = { };
|
|
char fname[SZ];
|
|
char *kernel_read = NULL, *module_read = NULL;
|
|
char *dump_write = NULL;
|
|
int opt;
|
|
int err;
|
|
|
|
while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) {
|
|
switch(opt) {
|
|
case 'i':
|
|
kernel_read = optarg;
|
|
break;
|
|
case 'I':
|
|
module_read = optarg;
|
|
external_module = 1;
|
|
break;
|
|
case 'm':
|
|
modversions = 1;
|
|
break;
|
|
case 'o':
|
|
dump_write = optarg;
|
|
break;
|
|
case 'a':
|
|
all_versions = 1;
|
|
break;
|
|
case 'w':
|
|
warn_unresolved = 1;
|
|
break;
|
|
default:
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
if (kernel_read)
|
|
read_dump(kernel_read, 1);
|
|
if (module_read)
|
|
read_dump(module_read, 0);
|
|
|
|
while (optind < argc) {
|
|
read_symbols(argv[optind++]);
|
|
}
|
|
|
|
for (mod = modules; mod; mod = mod->next) {
|
|
if (mod->skip)
|
|
continue;
|
|
check_exports(mod);
|
|
}
|
|
|
|
err = 0;
|
|
|
|
for (mod = modules; mod; mod = mod->next) {
|
|
if (mod->skip)
|
|
continue;
|
|
|
|
buf.pos = 0;
|
|
|
|
add_header(&buf, mod);
|
|
err |= add_versions(&buf, mod);
|
|
add_depends(&buf, mod, modules);
|
|
add_moddevtable(&buf, mod);
|
|
add_srcversion(&buf, mod);
|
|
|
|
sprintf(fname, "%s.mod.c", mod->name);
|
|
write_if_changed(&buf, fname);
|
|
}
|
|
|
|
if (dump_write)
|
|
write_dump(dump_write);
|
|
|
|
return err;
|
|
}
|