1 /* vi: set sw=4 ts=4: */
3 * Mini insmod implementation for busybox
5 * Copyright (C) 1999,2000 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>
7 * and Ron Alder <alder@lineo.com>
9 * Based almost entirely on the Linux modutils-2.3.11 implementation.
10 * Copyright 1996, 1997 Linux International.
11 * New implementation contributed by Richard Henderson <rth@tamu.edu>
12 * Based on original work by Bjorn Ekwall <bj0rn@blox.se>
13 * Restructured (and partly rewritten) by:
14 * Björn Ekwall <bj0rn@blox.se> February 1999
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 * General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
41 #include <sys/utsname.h>
42 #include <sys/syscall.h>
43 #include <linux/unistd.h>
45 //----------------------------------------------------------------------------
46 //--------modutils module.h, lines 45-242
47 //----------------------------------------------------------------------------
49 /* Definitions for the Linux module syscall interface.
50 Copyright 1996, 1997 Linux International.
52 Contributed by Richard Henderson <rth@tamu.edu>
54 This file is part of the Linux modutils.
56 This program is free software; you can redistribute it and/or modify it
57 under the terms of the GNU General Public License as published by the
58 Free Software Foundation; either version 2 of the License, or (at your
59 option) any later version.
61 This program is distributed in the hope that it will be useful, but
62 WITHOUT ANY WARRANTY; without even the implied warranty of
63 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
64 General Public License for more details.
66 You should have received a copy of the GNU General Public License
67 along with this program; if not, write to the Free Software Foundation,
68 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
71 #ifndef MODUTILS_MODULE_H
72 #define MODUTILS_MODULE_H 1
74 #ident "$Id: insmod.c,v 1.10 2000/06/22 18:19:31 andersen Exp $"
76 /* This file contains the structures used by the 2.0 and 2.1 kernels.
77 We do not use the kernel headers directly because we do not wish
78 to be dependant on a particular kernel version to compile insmod. */
81 /*======================================================================*/
82 /* The structures used by Linux 2.0. */
84 /* The symbol format used by get_kernel_syms(2). */
93 unsigned long module; /* kernel addresses */
97 struct old_module_symbol
103 struct old_symbol_table
105 int size; /* total, including string table!!! */
108 struct old_module_symbol symbol[0]; /* actual size defined by n_symbols */
109 struct old_module_ref ref[0]; /* actual size defined by n_refs */
112 struct old_mod_routines
115 unsigned long cleanup;
121 unsigned long ref; /* the list of modules that refer to me */
122 unsigned long symtab;
124 int size; /* size of module in pages */
125 unsigned long addr; /* address of module */
127 unsigned long cleanup; /* cleanup routine */
130 /* Sent to init_module(2) or'ed into the code size parameter. */
131 #define OLD_MOD_AUTOCLEAN 0x40000000 /* big enough, but no sign problems... */
133 int get_kernel_syms(struct old_kernel_sym *);
134 int old_sys_init_module(const char *name, char *code, unsigned codesize,
135 struct old_mod_routines *, struct old_symbol_table *);
137 /*======================================================================*/
138 /* For sizeof() which are related to the module platform and not to the
139 environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */
141 #define tgt_sizeof_char sizeof(char)
142 #define tgt_sizeof_short sizeof(short)
143 #define tgt_sizeof_int sizeof(int)
144 #define tgt_sizeof_long sizeof(long)
145 #define tgt_sizeof_char_p sizeof(char *)
146 #define tgt_sizeof_void_p sizeof(void *)
147 #define tgt_long long
149 #if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64)
150 #undef tgt_sizeof_long
151 #undef tgt_sizeof_char_p
152 #undef tgt_sizeof_void_p
154 #define tgt_sizeof_long 8
155 #define tgt_sizeof_char_p 8
156 #define tgt_sizeof_void_p 8
157 #define tgt_long long long
160 /*======================================================================*/
161 /* The structures used in Linux 2.1. */
163 /* Note: new_module_symbol does not use tgt_long intentionally */
164 struct new_module_symbol
170 struct new_module_persist;
172 struct new_module_ref
174 unsigned tgt_long dep; /* kernel addresses */
175 unsigned tgt_long ref;
176 unsigned tgt_long next_ref;
181 unsigned tgt_long size_of_struct; /* == sizeof(module) */
182 unsigned tgt_long next;
183 unsigned tgt_long name;
184 unsigned tgt_long size;
187 unsigned tgt_long flags; /* AUTOCLEAN et al */
192 unsigned tgt_long syms;
193 unsigned tgt_long deps;
194 unsigned tgt_long refs;
195 unsigned tgt_long init;
196 unsigned tgt_long cleanup;
197 unsigned tgt_long ex_table_start;
198 unsigned tgt_long ex_table_end;
200 unsigned tgt_long gp;
202 /* Everything after here is extension. */
203 unsigned tgt_long persist_start;
204 unsigned tgt_long persist_end;
205 unsigned tgt_long can_unload;
206 unsigned tgt_long runsize;
209 struct new_module_info
217 /* Bits of module.flags. */
218 #define NEW_MOD_RUNNING 1
219 #define NEW_MOD_DELETED 2
220 #define NEW_MOD_AUTOCLEAN 4
221 #define NEW_MOD_VISITED 8
222 #define NEW_MOD_USED_ONCE 16
224 int new_sys_init_module(const char *name, const struct new_module *);
225 int query_module(const char *name, int which, void *buf, size_t bufsize,
228 /* Values for query_module's which. */
236 /*======================================================================*/
237 /* The system calls unchanged between 2.0 and 2.1. */
239 unsigned long create_module(const char *, size_t);
240 int delete_module(const char *);
243 #endif /* module.h */
245 //----------------------------------------------------------------------------
246 //--------end of modutils module.h
247 //----------------------------------------------------------------------------
251 //----------------------------------------------------------------------------
252 //--------modutils obj.h, lines 253-462
253 //----------------------------------------------------------------------------
255 /* Elf object file loading and relocation routines.
256 Copyright 1996, 1997 Linux International.
258 Contributed by Richard Henderson <rth@tamu.edu>
260 This file is part of the Linux modutils.
262 This program is free software; you can redistribute it and/or modify it
263 under the terms of the GNU General Public License as published by the
264 Free Software Foundation; either version 2 of the License, or (at your
265 option) any later version.
267 This program is distributed in the hope that it will be useful, but
268 WITHOUT ANY WARRANTY; without even the implied warranty of
269 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
270 General Public License for more details.
272 You should have received a copy of the GNU General Public License
273 along with this program; if not, write to the Free Software Foundation,
274 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
277 #ifndef MODUTILS_OBJ_H
278 #define MODUTILS_OBJ_H 1
280 #ident "$Id: insmod.c,v 1.10 2000/06/22 18:19:31 andersen Exp $"
282 /* The relocatable object is manipulated using elfin types. */
288 /* Machine-specific elf macros for i386 et al. */
290 #define ELFCLASSM ELFCLASS32
291 #define ELFDATAM ELFDATA2LSB
293 #define MATCH_MACHINE(x) (x == EM_386 || x == EM_486)
295 #define SHT_RELM SHT_REL
296 #define Elf32_RelM Elf32_Rel
300 # if ELFCLASSM == ELFCLASS32
301 # define ElfW(x) Elf32_ ## x
302 # define ELFW(x) ELF32_ ## x
304 # define ElfW(x) Elf64_ ## x
305 # define ELFW(x) ELF64_ ## x
309 /* For some reason this is missing from libc5. */
310 #ifndef ELF32_ST_INFO
311 # define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
314 #ifndef ELF64_ST_INFO
315 # define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
318 struct obj_string_patch;
319 struct obj_symbol_patch;
326 struct obj_section *load_next;
332 struct obj_symbol *next; /* hash table link */
336 int secidx; /* the defining section index/module */
338 int ksymidx; /* for export to the kernel symtab */
339 int referenced; /* actually used in the link */
342 /* Hardcode the hash table size. We shouldn't be needing so many
343 symbols that we begin to degrade performance, and we get a big win
344 by giving the compiler a constant divisor. */
346 #define HASH_BUCKETS 521
352 struct obj_section **sections;
353 struct obj_section *load_order;
354 struct obj_section **load_order_search_start;
355 struct obj_string_patch *string_patches;
356 struct obj_symbol_patch *symbol_patches;
357 int (*symbol_cmp)(const char *, const char *);
358 unsigned long (*symbol_hash)(const char *);
359 unsigned long local_symtab_size;
360 struct obj_symbol **local_symtab;
361 struct obj_symbol *symtab[HASH_BUCKETS];
372 struct obj_string_patch
374 struct obj_string_patch *next;
376 ElfW(Addr) reloc_offset;
377 ElfW(Addr) string_offset;
380 struct obj_symbol_patch
382 struct obj_symbol_patch *next;
384 ElfW(Addr) reloc_offset;
385 struct obj_symbol *sym;
389 /* Generic object manipulation routines. */
391 unsigned long obj_elf_hash(const char *);
393 unsigned long obj_elf_hash_n(const char *, unsigned long len);
395 struct obj_symbol *obj_add_symbol (struct obj_file *f, const char *name,
396 unsigned long symidx, int info, int secidx,
397 ElfW(Addr) value, unsigned long size);
399 struct obj_symbol *obj_find_symbol (struct obj_file *f,
402 ElfW(Addr) obj_symbol_final_value(struct obj_file *f,
403 struct obj_symbol *sym);
405 void obj_set_symbol_compare(struct obj_file *f,
406 int (*cmp)(const char *, const char *),
407 unsigned long (*hash)(const char *));
409 struct obj_section *obj_find_section (struct obj_file *f,
412 void obj_insert_section_load_order (struct obj_file *f,
413 struct obj_section *sec);
415 struct obj_section *obj_create_alloced_section (struct obj_file *f,
420 struct obj_section *obj_create_alloced_section_first (struct obj_file *f,
425 void *obj_extend_section (struct obj_section *sec, unsigned long more);
427 int obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
430 int obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
431 struct obj_symbol *sym);
433 int obj_check_undefineds(struct obj_file *f);
435 void obj_allocate_commons(struct obj_file *f);
437 unsigned long obj_load_size (struct obj_file *f);
439 int obj_relocate (struct obj_file *f, ElfW(Addr) base);
441 struct obj_file *obj_load(FILE *f);
443 int obj_create_image (struct obj_file *f, char *image);
445 /* Architecture specific manipulation routines. */
447 struct obj_file *arch_new_file (void);
449 struct obj_section *arch_new_section (void);
451 struct obj_symbol *arch_new_symbol (void);
453 enum obj_reloc arch_apply_relocation (struct obj_file *f,
454 struct obj_section *targsec,
455 struct obj_section *symsec,
456 struct obj_symbol *sym,
457 ElfW(RelM) *rel, ElfW(Addr) value);
459 int arch_create_got (struct obj_file *f);
462 int arch_init_module (struct obj_file *f, struct new_module *);
465 //----------------------------------------------------------------------------
466 //--------end of modutils obj.h
467 //----------------------------------------------------------------------------
473 #define _PATH_MODULES "/lib/modules"
474 #define STRVERSIONLEN 32
476 #if !defined(BB_FEATURE_INSMOD_NEW_KERNEL) && !defined(BB_FEATURE_INSMOD_OLD_KERNEL)
477 #error "Must have ether BB_FEATURE_INSMOD_NEW_KERNEL or BB_FEATURE_INSMOD_OLD_KERNEL defined"
480 /*======================================================================*/
482 int flag_force_load = 0;
483 int flag_autoclean = 0;
484 int flag_verbose = 0;
488 /*======================================================================*/
490 struct i386_got_entry {
492 unsigned offset_done:1;
493 unsigned reloc_done:1;
497 struct obj_file root;
498 struct obj_section *got;
502 struct obj_symbol root;
503 struct i386_got_entry gotent;
508 struct external_module {
513 struct new_module_symbol *syms;
516 struct new_module_symbol *ksyms;
519 struct external_module *ext_modules;
521 int n_ext_modules_used;
525 /* Some firendly syscalls to cheer everyone's day... */
526 #define __NR_new_sys_init_module __NR_init_module
527 _syscall2(int, new_sys_init_module, const char *, name,
528 const struct new_module *, info)
529 #define __NR_old_sys_init_module __NR_init_module
530 _syscall5(int, old_sys_init_module, const char *, name, char *, code,
531 unsigned, codesize, struct old_mod_routines *, routines,
532 struct old_symbol_table *, symtab)
533 _syscall5(int, query_module, const char *, name, int, which,
534 void *, buf, size_t, bufsize, size_t*, ret);
536 _syscall1(int, delete_module, const char *, name)
538 extern int delete_module(const char *);
541 #if defined(__i386__) || defined(__m68k__) || defined(__arm__)
542 /* Jump through hoops to fixup error return codes */
543 #define __NR__create_module __NR_create_module
544 static inline _syscall2(long, _create_module, const char *, name, size_t,
546 unsigned long create_module(const char *name, size_t size)
548 long ret = _create_module(name, size);
550 if (ret == -1 && errno > 125) {
557 _syscall2(unsigned long, create_module, const char *, name, size_t, size)
559 static char m_filename[BUFSIZ + 1] = "\0";
560 static char m_fullName[BUFSIZ + 1] = "\0";
561 static const char insmod_usage[] =
562 "insmod [OPTION]... MODULE [symbol=value]...\n"
563 #ifndef BB_FEATURE_TRIVIAL_HELP
564 "\nLoads the specified kernel modules into the kernel.\n\n"
566 "\t-f\tForce module to load into the wrong kernel version.\n"
567 "\t-k\tMake module autoclean-able.\n"
568 "\t-v\tverbose output\n" "\t-x\tdo not export externs\n"
572 /*======================================================================*/
574 void *xrealloc(void *old, size_t size)
576 void *ptr = realloc(old, size);
578 perror("Out of memory");
585 static int findNamedModule(const char *fileName, struct stat *statbuf,
588 char *fullName = (char *) userDate;
591 if (fullName[0] == '\0')
594 char *tmp = strrchr(fileName, '/');
597 tmp = (char *) fileName;
600 if (check_wildcard_match(tmp, fullName) == TRUE) {
601 /* Stop searching if we find a match */
602 memcpy(m_filename, fileName, strlen(fileName));
610 /*======================================================================*/
612 struct obj_file *arch_new_file(void)
615 f = xmalloc(sizeof(*f));
620 struct obj_section *arch_new_section(void)
622 return xmalloc(sizeof(struct obj_section));
625 struct obj_symbol *arch_new_symbol(void)
627 struct i386_symbol *sym;
628 sym = xmalloc(sizeof(*sym));
629 memset(&sym->gotent, 0, sizeof(sym->gotent));
633 arch_apply_relocation(struct obj_file *f,
634 struct obj_section *targsec,
635 struct obj_section *symsec,
636 struct obj_symbol *sym,
637 Elf32_Rel * rel, Elf32_Addr v)
639 struct i386_file *ifile = (struct i386_file *) f;
640 struct i386_symbol *isym = (struct i386_symbol *) sym;
642 Elf32_Addr *loc = (Elf32_Addr *) (targsec->contents + rel->r_offset);
643 Elf32_Addr dot = targsec->header.sh_addr + rel->r_offset;
644 Elf32_Addr got = ifile->got ? ifile->got->header.sh_addr : 0;
646 enum obj_reloc ret = obj_reloc_ok;
648 switch (ELF32_R_TYPE(rel->r_info)) {
676 assert(isym != NULL);
677 if (!isym->gotent.reloc_done) {
678 isym->gotent.reloc_done = 1;
679 *(Elf32_Addr *) (ifile->got->contents + isym->gotent.offset) =
682 *loc += isym->gotent.offset;
691 ret = obj_reloc_unhandled;
698 int arch_create_got(struct obj_file *f)
700 struct i386_file *ifile = (struct i386_file *) f;
701 int i, n, offset = 0, gotneeded = 0;
703 n = ifile->root.header.e_shnum;
704 for (i = 0; i < n; ++i) {
705 struct obj_section *relsec, *symsec, *strsec;
706 Elf32_Rel *rel, *relend;
710 relsec = ifile->root.sections[i];
711 if (relsec->header.sh_type != SHT_REL)
714 symsec = ifile->root.sections[relsec->header.sh_link];
715 strsec = ifile->root.sections[symsec->header.sh_link];
717 rel = (Elf32_Rel *) relsec->contents;
718 relend = rel + (relsec->header.sh_size / sizeof(Elf32_Rel));
719 symtab = (Elf32_Sym *) symsec->contents;
720 strtab = (const char *) strsec->contents;
722 for (; rel < relend; ++rel) {
724 struct i386_symbol *intsym;
727 switch (ELF32_R_TYPE(rel->r_info)) {
738 extsym = &symtab[ELF32_R_SYM(rel->r_info)];
740 name = strtab + extsym->st_name;
742 name = f->sections[extsym->st_shndx]->name;
744 (struct i386_symbol *) obj_find_symbol(&ifile->root, name);
746 if (!intsym->gotent.offset_done) {
747 intsym->gotent.offset_done = 1;
748 intsym->gotent.offset = offset;
754 if (offset > 0 || gotneeded)
756 obj_create_alloced_section(&ifile->root, ".got", 4, offset);
761 int arch_init_module(struct obj_file *f, struct new_module *mod)
767 /*======================================================================*/
769 /* Standard ELF hash function. */
770 inline unsigned long obj_elf_hash_n(const char *name, unsigned long n)
779 if ((g = (h & 0xf0000000)) != 0) {
788 unsigned long obj_elf_hash(const char *name)
790 return obj_elf_hash_n(name, strlen(name));
793 #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
794 /* Get the kernel version in the canonical integer form. */
796 static int get_kernel_version(char str[STRVERSIONLEN])
798 struct utsname uts_info;
802 if (uname(&uts_info) < 0)
804 strncpy(str, uts_info.release, STRVERSIONLEN);
805 p = uts_info.release;
807 a = strtoul(p, &p, 10);
810 b = strtoul(p + 1, &p, 10);
813 c = strtoul(p + 1, &q, 10);
817 return a << 16 | b << 8 | c;
820 /* String comparison for non-co-versioned kernel and module. */
822 static int ncv_strcmp(const char *a, const char *b)
824 size_t alen = strlen(a), blen = strlen(b);
826 if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R')
827 return strncmp(a, b, alen);
828 else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R')
829 return strncmp(a, b, blen);
834 /* String hashing for non-co-versioned kernel and module. Here
835 we are simply forced to drop the crc from the hash. */
837 static unsigned long ncv_symbol_hash(const char *str)
839 size_t len = strlen(str);
840 if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R')
842 return obj_elf_hash_n(str, len);
846 obj_set_symbol_compare(struct obj_file *f,
847 int (*cmp) (const char *, const char *),
848 unsigned long (*hash) (const char *))
853 struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next;
856 f->symbol_hash = hash;
858 memcpy(tmptab, f->symtab, sizeof(tmptab));
859 memset(f->symtab, 0, sizeof(f->symtab));
861 for (i = 0; i < HASH_BUCKETS; ++i)
862 for (sym = tmptab[i]; sym; sym = next) {
863 unsigned long h = hash(sym->name) % HASH_BUCKETS;
865 sym->next = f->symtab[h];
871 #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
874 struct obj_symbol *obj_add_symbol(struct obj_file *f, const char *name,
875 unsigned long symidx, int info,
876 int secidx, ElfW(Addr) value,
879 struct obj_symbol *sym;
880 unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
881 int n_type = ELFW(ST_TYPE) (info);
882 int n_binding = ELFW(ST_BIND) (info);
884 for (sym = f->symtab[hash]; sym; sym = sym->next)
885 if (f->symbol_cmp(sym->name, name) == 0) {
886 int o_secidx = sym->secidx;
887 int o_info = sym->info;
888 int o_type = ELFW(ST_TYPE) (o_info);
889 int o_binding = ELFW(ST_BIND) (o_info);
891 /* A redefinition! Is it legal? */
893 if (secidx == SHN_UNDEF)
895 else if (o_secidx == SHN_UNDEF)
897 else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) {
898 /* Cope with local and global symbols of the same name
899 in the same object file, as might have been created
900 by ld -r. The only reason locals are now seen at this
901 level at all is so that we can do semi-sensible things
904 struct obj_symbol *nsym, **p;
906 nsym = arch_new_symbol();
907 nsym->next = sym->next;
910 /* Excise the old (local) symbol from the hash chain. */
911 for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next)
915 } else if (n_binding == STB_LOCAL) {
916 /* Another symbol of the same name has already been defined.
917 Just add this to the local table. */
918 sym = arch_new_symbol();
921 f->local_symtab[symidx] = sym;
923 } else if (n_binding == STB_WEAK)
925 else if (o_binding == STB_WEAK)
927 /* Don't unify COMMON symbols with object types the programmer
929 else if (secidx == SHN_COMMON
930 && (o_type == STT_NOTYPE || o_type == STT_OBJECT))
932 else if (o_secidx == SHN_COMMON
933 && (n_type == STT_NOTYPE || n_type == STT_OBJECT))
936 /* Don't report an error if the symbol is coming from
937 the kernel or some external module. */
938 if (secidx <= SHN_HIRESERVE)
939 fprintf(stderr, "%s multiply defined\n", name);
944 /* Completely new symbol. */
945 sym = arch_new_symbol();
946 sym->next = f->symtab[hash];
947 f->symtab[hash] = sym;
950 if (ELFW(ST_BIND) (info) == STB_LOCAL)
951 f->local_symtab[symidx] = sym;
957 sym->secidx = secidx;
963 struct obj_symbol *obj_find_symbol(struct obj_file *f, const char *name)
965 struct obj_symbol *sym;
966 unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
968 for (sym = f->symtab[hash]; sym; sym = sym->next)
969 if (f->symbol_cmp(sym->name, name) == 0)
976 obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym)
979 if (sym->secidx >= SHN_LORESERVE)
982 return sym->value + f->sections[sym->secidx]->header.sh_addr;
984 /* As a special case, a NULL sym has value zero. */
989 struct obj_section *obj_find_section(struct obj_file *f, const char *name)
991 int i, n = f->header.e_shnum;
993 for (i = 0; i < n; ++i)
994 if (strcmp(f->sections[i]->name, name) == 0)
995 return f->sections[i];
1000 static int obj_load_order_prio(struct obj_section *a)
1002 unsigned long af, ac;
1004 af = a->header.sh_flags;
1007 if (a->name[0] != '.' || strlen(a->name) != 10 ||
1008 strcmp(a->name + 5, ".init"))
1012 if (!(af & SHF_WRITE))
1014 if (af & SHF_EXECINSTR)
1016 if (a->header.sh_type != SHT_NOBITS)
1023 obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec)
1025 struct obj_section **p;
1026 int prio = obj_load_order_prio(sec);
1027 for (p = f->load_order_search_start; *p; p = &(*p)->load_next)
1028 if (obj_load_order_prio(*p) < prio)
1030 sec->load_next = *p;
1034 struct obj_section *obj_create_alloced_section(struct obj_file *f,
1036 unsigned long align,
1039 int newidx = f->header.e_shnum++;
1040 struct obj_section *sec;
1042 f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec));
1043 f->sections[newidx] = sec = arch_new_section();
1045 memset(sec, 0, sizeof(*sec));
1046 sec->header.sh_type = SHT_PROGBITS;
1047 sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
1048 sec->header.sh_size = size;
1049 sec->header.sh_addralign = align;
1053 sec->contents = xmalloc(size);
1055 obj_insert_section_load_order(f, sec);
1060 struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
1062 unsigned long align,
1065 int newidx = f->header.e_shnum++;
1066 struct obj_section *sec;
1068 f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec));
1069 f->sections[newidx] = sec = arch_new_section();
1071 memset(sec, 0, sizeof(*sec));
1072 sec->header.sh_type = SHT_PROGBITS;
1073 sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
1074 sec->header.sh_size = size;
1075 sec->header.sh_addralign = align;
1079 sec->contents = xmalloc(size);
1081 sec->load_next = f->load_order;
1082 f->load_order = sec;
1083 if (f->load_order_search_start == &f->load_order)
1084 f->load_order_search_start = &sec->load_next;
1089 void *obj_extend_section(struct obj_section *sec, unsigned long more)
1091 unsigned long oldsize = sec->header.sh_size;
1092 sec->contents = xrealloc(sec->contents, sec->header.sh_size += more);
1093 return sec->contents + oldsize;
1098 /* Conditionally add the symbols from the given symbol set to the
1104 int idx, struct new_module_symbol *syms, size_t nsyms)
1106 struct new_module_symbol *s;
1110 for (i = 0, s = syms; i < nsyms; ++i, ++s) {
1112 /* Only add symbols that are already marked external. If we
1113 override locals we may cause problems for argument initialization.
1114 We will also create a false dependency on the module. */
1115 struct obj_symbol *sym;
1117 sym = obj_find_symbol(f, (char *) s->name);
1118 if (sym && !ELFW(ST_BIND) (sym->info) == STB_LOCAL) {
1119 sym = obj_add_symbol(f, (char *) s->name, -1,
1120 ELFW(ST_INFO) (STB_GLOBAL, STT_NOTYPE),
1122 /* Did our symbol just get installed? If so, mark the
1123 module as "used". */
1124 if (sym->secidx == idx)
1132 static void add_kernel_symbols(struct obj_file *f)
1134 struct external_module *m;
1135 size_t i, nused = 0;
1137 /* Add module symbols first. */
1139 for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m)
1141 && add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms,
1142 m->nsyms)) m->used = 1, ++nused;
1144 n_ext_modules_used = nused;
1146 /* And finally the symbols from the kernel proper. */
1149 add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms);
1152 static char *get_modinfo_value(struct obj_file *f, const char *key)
1154 struct obj_section *sec;
1155 char *p, *v, *n, *ep;
1156 size_t klen = strlen(key);
1158 sec = obj_find_section(f, ".modinfo");
1162 ep = p + sec->header.sh_size;
1165 n = strchr(p, '\0');
1167 if (v - p == klen && strncmp(p, key, klen) == 0)
1170 if (n - p == klen && strcmp(p, key) == 0)
1180 /*======================================================================*/
1181 /* Functions relating to module loading in pre 2.1 kernels. */
1184 old_process_module_arguments(struct obj_file *f, int argc, char **argv)
1188 struct obj_symbol *sym;
1192 if ((q = strchr(p, '=')) == NULL)
1196 sym = obj_find_symbol(f, p);
1198 /* Also check that the parameter was not resolved from the kernel. */
1199 if (sym == NULL || sym->secidx > SHN_HIRESERVE) {
1200 fprintf(stderr, "symbol for parameter %s not found\n", p);
1204 loc = (int *) (f->sections[sym->secidx]->contents + sym->value);
1206 /* Do C quoting if we begin with a ". */
1210 str = alloca(strlen(q));
1211 for (r = str, q++; *q != '"'; ++q, ++r) {
1213 fprintf(stderr, "improperly terminated string argument for %s\n", p);
1215 } else if (*q == '\\')
1249 if (q[1] >= '0' && q[1] <= '7') {
1250 c = (c * 8) + *++q - '0';
1251 if (q[1] >= '0' && q[1] <= '7')
1252 c = (c * 8) + *++q - '0';
1265 obj_string_patch(f, sym->secidx, sym->value, str);
1266 } else if (*q >= '0' && *q <= '9') {
1268 *loc++ = strtoul(q, &q, 0);
1269 while (*q++ == ',');
1271 char *contents = f->sections[sym->secidx]->contents;
1272 char *loc = contents + sym->value;
1273 char *r; /* To search for commas */
1275 /* Break the string with comas */
1276 while ((r = strchr(q, ',')) != (char *) NULL) {
1278 obj_string_patch(f, sym->secidx, loc - contents, q);
1279 loc += sizeof(char *);
1284 obj_string_patch(f, sym->secidx, loc - contents, q);
1293 #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
1294 static int old_is_module_checksummed(struct obj_file *f)
1296 return obj_find_symbol(f, "Using_Versions") != NULL;
1298 /* Get the module's kernel version in the canonical integer form. */
1301 old_get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
1303 struct obj_symbol *sym;
1307 sym = obj_find_symbol(f, "kernel_version");
1311 p = f->sections[sym->secidx]->contents + sym->value;
1312 strncpy(str, p, STRVERSIONLEN);
1314 a = strtoul(p, &p, 10);
1317 b = strtoul(p + 1, &p, 10);
1320 c = strtoul(p + 1, &q, 10);
1324 return a << 16 | b << 8 | c;
1327 #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
1329 #ifdef BB_FEATURE_INSMOD_OLD_KERNEL
1331 /* Fetch all the symbols and divvy them up as appropriate for the modules. */
1333 static int old_get_kernel_symbols(void)
1335 struct old_kernel_sym *ks, *k;
1336 struct new_module_symbol *s;
1337 struct external_module *mod;
1338 int nks, nms, nmod, i;
1340 nks = get_kernel_syms(NULL);
1342 errorMsg("get_kernel_syms: %s: %s", m_name, strerror(errno));
1346 ks = k = xmalloc(nks * sizeof(*ks));
1348 if (get_kernel_syms(ks) != nks) {
1349 perror("inconsistency with get_kernel_syms -- is someone else "
1350 "playing with modules?");
1355 /* Collect the module information. */
1360 while (k->name[0] == '#' && k->name[1]) {
1361 struct old_kernel_sym *k2;
1362 struct new_module_symbol *s;
1364 /* Find out how many symbols this module has. */
1365 for (k2 = k + 1; k2->name[0] != '#'; ++k2)
1369 mod = xrealloc(mod, (++nmod + 1) * sizeof(*mod));
1370 mod[nmod].name = k->name + 1;
1371 mod[nmod].addr = k->value;
1373 mod[nmod].nsyms = nms;
1374 mod[nmod].syms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL);
1376 for (i = 0, ++k; i < nms; ++i, ++s, ++k) {
1377 s->name = (unsigned long) k->name;
1378 s->value = k->value;
1385 n_ext_modules = nmod + 1;
1387 /* Now collect the symbols for the kernel proper. */
1389 if (k->name[0] == '#')
1392 nksyms = nms = nks - (k - ks);
1393 ksyms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL);
1395 for (i = 0; i < nms; ++i, ++s, ++k) {
1396 s->name = (unsigned long) k->name;
1397 s->value = k->value;
1403 /* Return the kernel symbol checksum version, or zero if not used. */
1405 static int old_is_kernel_checksummed(void)
1407 /* Using_Versions is the first symbol. */
1409 && strcmp((char *) ksyms[0].name,
1410 "Using_Versions") == 0) return ksyms[0].value;
1416 static int old_create_mod_use_count(struct obj_file *f)
1418 struct obj_section *sec;
1420 sec = obj_create_alloced_section_first(f, ".moduse", sizeof(long),
1423 obj_add_symbol(f, "mod_use_count_", -1,
1424 ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0,
1431 old_init_module(const char *m_name, struct obj_file *f,
1432 unsigned long m_size)
1435 struct old_mod_routines routines;
1436 struct old_symbol_table *symtab;
1439 /* Create the symbol table */
1441 int nsyms = 0, strsize = 0, total;
1443 /* Size things first... */
1446 for (i = 0; i < HASH_BUCKETS; ++i) {
1447 struct obj_symbol *sym;
1448 for (sym = f->symtab[i]; sym; sym = sym->next)
1449 if (ELFW(ST_BIND) (sym->info) != STB_LOCAL
1450 && sym->secidx <= SHN_HIRESERVE)
1452 sym->ksymidx = nsyms++;
1453 strsize += strlen(sym->name) + 1;
1458 total = (sizeof(struct old_symbol_table)
1459 + nsyms * sizeof(struct old_module_symbol)
1460 + n_ext_modules_used * sizeof(struct old_module_ref)
1462 symtab = xmalloc(total);
1463 symtab->size = total;
1464 symtab->n_symbols = nsyms;
1465 symtab->n_refs = n_ext_modules_used;
1467 if (flag_export && nsyms) {
1468 struct old_module_symbol *ksym;
1472 ksym = symtab->symbol;
1473 str = ((char *) ksym + nsyms * sizeof(struct old_module_symbol)
1474 + n_ext_modules_used * sizeof(struct old_module_ref));
1476 for (i = 0; i < HASH_BUCKETS; ++i) {
1477 struct obj_symbol *sym;
1478 for (sym = f->symtab[i]; sym; sym = sym->next)
1479 if (sym->ksymidx >= 0) {
1480 ksym->addr = obj_symbol_final_value(f, sym);
1482 (unsigned long) str - (unsigned long) symtab;
1484 str = stpcpy(str, sym->name) + 1;
1490 if (n_ext_modules_used) {
1491 struct old_module_ref *ref;
1494 ref = (struct old_module_ref *)
1495 ((char *) symtab->symbol + nsyms * sizeof(struct old_module_symbol));
1497 for (i = 0; i < n_ext_modules; ++i)
1498 if (ext_modules[i].used)
1499 ref++->module = ext_modules[i].addr;
1503 /* Fill in routines. */
1506 obj_symbol_final_value(f, obj_find_symbol(f, "init_module"));
1508 obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module"));
1510 /* Whew! All of the initialization is complete. Collect the final
1511 module image and give it to the kernel. */
1513 image = xmalloc(m_size);
1514 obj_create_image(f, image);
1516 /* image holds the complete relocated module, accounting correctly for
1517 mod_use_count. However the old module kernel support assume that
1518 it is receiving something which does not contain mod_use_count. */
1519 ret = old_sys_init_module(m_name, image + sizeof(long),
1520 m_size | (flag_autoclean ? OLD_MOD_AUTOCLEAN
1521 : 0), &routines, symtab);
1523 errorMsg("init_module: %s: %s", m_name, strerror(errno));
1533 #define old_create_mod_use_count(x) TRUE
1534 #define old_init_module(x, y, z) TRUE
1536 #endif /* BB_FEATURE_INSMOD_OLD_KERNEL */
1540 /*======================================================================*/
1541 /* Functions relating to module loading after 2.1.18. */
1544 new_process_module_arguments(struct obj_file *f, int argc, char **argv)
1548 struct obj_symbol *sym;
1549 char *contents, *loc;
1553 if ((q = strchr(p, '=')) == NULL)
1556 key = alloca(q - p + 6);
1557 memcpy(key, "parm_", 5);
1558 memcpy(key + 5, p, q - p);
1561 p = get_modinfo_value(f, key);
1564 fprintf(stderr, "invalid parameter %s\n", key);
1568 sym = obj_find_symbol(f, key);
1570 /* Also check that the parameter was not resolved from the kernel. */
1571 if (sym == NULL || sym->secidx > SHN_HIRESERVE) {
1572 fprintf(stderr, "symbol for parameter %s not found\n", key);
1577 min = strtoul(p, &p, 10);
1579 max = strtoul(p + 1, &p, 10);
1585 contents = f->sections[sym->secidx]->contents;
1586 loc = contents + sym->value;
1590 if ((*p == 's') || (*p == 'c')) {
1593 /* Do C quoting if we begin with a ", else slurp the lot. */
1597 str = alloca(strlen(q));
1598 for (r = str, q++; *q != '"'; ++q, ++r) {
1601 "improperly terminated string argument for %s\n",
1604 } else if (*q == '\\')
1638 if (q[1] >= '0' && q[1] <= '7') {
1639 c = (c * 8) + *++q - '0';
1640 if (q[1] >= '0' && q[1] <= '7')
1641 c = (c * 8) + *++q - '0';
1658 /* In this case, the string is not quoted. We will break
1659 it using the coma (like for ints). If the user wants to
1660 include comas in a string, he just has to quote it */
1662 /* Search the next coma */
1666 if (r != (char *) NULL) {
1667 /* Recopy the current field */
1668 str = alloca(r - q + 1);
1669 memcpy(str, q, r - q);
1671 /* I don't know if it is usefull, as the previous case
1672 doesn't null terminate the string ??? */
1675 /* Keep next fields */
1686 obj_string_patch(f, sym->secidx, loc - contents, str);
1687 loc += tgt_sizeof_char_p;
1689 /* Array of chars (in fact, matrix !) */
1690 long charssize; /* size of each member */
1692 /* Get the size of each member */
1693 /* Probably we should do that outside the loop ? */
1694 if (!isdigit(*(p + 1))) {
1696 "parameter type 'c' for %s must be followed by"
1697 " the maximum size\n", key);
1700 charssize = strtoul(p + 1, (char **) NULL, 10);
1703 if (strlen(str) >= charssize) {
1705 "string too long for %s (max %ld)\n", key,
1710 /* Copy to location */
1711 strcpy((char *) loc, str);
1715 long v = strtoul(q, &q, 0);
1722 loc += tgt_sizeof_short;
1726 loc += tgt_sizeof_int;
1730 loc += tgt_sizeof_long;
1734 fprintf(stderr, "unknown parameter type '%c' for %s\n",
1750 goto retry_end_of_value;
1754 fprintf(stderr, "too many values for %s (max %d)\n",
1762 fprintf(stderr, "invalid argument syntax for %s\n", key);
1769 fprintf(stderr, "too few values for %s (min %d)\n", key, min);
1779 #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
1780 static int new_is_module_checksummed(struct obj_file *f)
1782 const char *p = get_modinfo_value(f, "using_checksums");
1789 /* Get the module's kernel version in the canonical integer form. */
1792 new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
1797 p = get_modinfo_value(f, "kernel_version");
1800 strncpy(str, p, STRVERSIONLEN);
1802 a = strtoul(p, &p, 10);
1805 b = strtoul(p + 1, &p, 10);
1808 c = strtoul(p + 1, &q, 10);
1812 return a << 16 | b << 8 | c;
1815 #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
1818 #ifdef BB_FEATURE_INSMOD_NEW_KERNEL
1820 /* Fetch the loaded modules, and all currently exported symbols. */
1822 static int new_get_kernel_symbols(void)
1824 char *module_names, *mn;
1825 struct external_module *modules, *m;
1826 struct new_module_symbol *syms, *s;
1827 size_t ret, bufsize, nmod, nsyms, i, j;
1829 /* Collect the loaded modules. */
1831 module_names = xmalloc(bufsize = 256);
1833 if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) {
1834 if (errno == ENOSPC) {
1835 module_names = xrealloc(module_names, bufsize = ret);
1836 goto retry_modules_load;
1838 errorMsg("QM_MODULES: %s", strerror(errno));
1842 n_ext_modules = nmod = ret;
1843 ext_modules = modules = xmalloc(nmod * sizeof(*modules));
1844 memset(modules, 0, nmod * sizeof(*modules));
1846 /* Collect the modules' symbols. */
1848 for (i = 0, mn = module_names, m = modules;
1849 i < nmod; ++i, ++m, mn += strlen(mn) + 1) {
1850 struct new_module_info info;
1852 if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) {
1853 if (errno == ENOENT) {
1854 /* The module was removed out from underneath us. */
1857 errorMsg("query_module: QM_INFO: %s: %s", mn, strerror(errno));
1861 syms = xmalloc(bufsize = 1024);
1863 if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) {
1866 syms = xrealloc(syms, bufsize = ret);
1867 goto retry_mod_sym_load;
1869 /* The module was removed out from underneath us. */
1872 errorMsg("query_module: QM_SYMBOLS: %s: %s", mn, strerror(errno));
1879 m->addr = info.addr;
1883 for (j = 0, s = syms; j < nsyms; ++j, ++s) {
1884 s->name += (unsigned long) syms;
1888 /* Collect the kernel's symbols. */
1890 syms = xmalloc(bufsize = 16 * 1024);
1891 retry_kern_sym_load:
1892 if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) {
1893 if (errno == ENOSPC) {
1894 syms = xrealloc(syms, bufsize = ret);
1895 goto retry_kern_sym_load;
1897 errorMsg("kernel: QM_SYMBOLS: %s", strerror(errno));
1900 nksyms = nsyms = ret;
1903 for (j = 0, s = syms; j < nsyms; ++j, ++s) {
1904 s->name += (unsigned long) syms;
1910 /* Return the kernel symbol checksum version, or zero if not used. */
1912 static int new_is_kernel_checksummed(void)
1914 struct new_module_symbol *s;
1917 /* Using_Versions is not the first symbol, but it should be in there. */
1919 for (i = 0, s = ksyms; i < nksyms; ++i, ++s)
1920 if (strcmp((char *) s->name, "Using_Versions") == 0)
1927 static int new_create_this_module(struct obj_file *f, const char *m_name)
1929 struct obj_section *sec;
1931 sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long,
1932 sizeof(struct new_module));
1933 memset(sec->contents, 0, sizeof(struct new_module));
1935 obj_add_symbol(f, "__this_module", -1,
1936 ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0,
1937 sizeof(struct new_module));
1939 obj_string_patch(f, sec->idx, offsetof(struct new_module, name),
1946 static int new_create_module_ksymtab(struct obj_file *f)
1948 struct obj_section *sec;
1951 /* We must always add the module references. */
1953 if (n_ext_modules_used) {
1954 struct new_module_ref *dep;
1955 struct obj_symbol *tm;
1957 sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p,
1958 (sizeof(struct new_module_ref)
1959 * n_ext_modules_used));
1963 tm = obj_find_symbol(f, "__this_module");
1964 dep = (struct new_module_ref *) sec->contents;
1965 for (i = 0; i < n_ext_modules; ++i)
1966 if (ext_modules[i].used) {
1967 dep->dep = ext_modules[i].addr;
1968 obj_symbol_patch(f, sec->idx,
1969 (char *) &dep->ref - sec->contents, tm);
1975 if (flag_export && !obj_find_section(f, "__ksymtab")) {
1980 obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p,
1983 /* We don't want to export symbols residing in sections that
1984 aren't loaded. There are a number of these created so that
1985 we make sure certain module options don't appear twice. */
1987 loaded = alloca(sizeof(int) * (i = f->header.e_shnum));
1989 loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0;
1991 for (nsyms = i = 0; i < HASH_BUCKETS; ++i) {
1992 struct obj_symbol *sym;
1993 for (sym = f->symtab[i]; sym; sym = sym->next)
1994 if (ELFW(ST_BIND) (sym->info) != STB_LOCAL
1995 && sym->secidx <= SHN_HIRESERVE
1996 && (sym->secidx >= SHN_LORESERVE
1997 || loaded[sym->secidx])) {
1998 ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p;
2000 obj_symbol_patch(f, sec->idx, ofs, sym);
2001 obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p,
2008 obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p);
2016 new_init_module(const char *m_name, struct obj_file *f,
2017 unsigned long m_size)
2019 struct new_module *module;
2020 struct obj_section *sec;
2025 sec = obj_find_section(f, ".this");
2026 module = (struct new_module *) sec->contents;
2027 m_addr = sec->header.sh_addr;
2029 module->size_of_struct = sizeof(*module);
2030 module->size = m_size;
2031 module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0;
2033 sec = obj_find_section(f, "__ksymtab");
2034 if (sec && sec->header.sh_size) {
2035 module->syms = sec->header.sh_addr;
2036 module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p);
2039 if (n_ext_modules_used) {
2040 sec = obj_find_section(f, ".kmodtab");
2041 module->deps = sec->header.sh_addr;
2042 module->ndeps = n_ext_modules_used;
2046 obj_symbol_final_value(f, obj_find_symbol(f, "init_module"));
2048 obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module"));
2050 sec = obj_find_section(f, "__ex_table");
2052 module->ex_table_start = sec->header.sh_addr;
2053 module->ex_table_end = sec->header.sh_addr + sec->header.sh_size;
2056 sec = obj_find_section(f, ".text.init");
2058 module->runsize = sec->header.sh_addr - m_addr;
2060 sec = obj_find_section(f, ".data.init");
2062 if (!module->runsize ||
2063 module->runsize > sec->header.sh_addr - m_addr)
2064 module->runsize = sec->header.sh_addr - m_addr;
2067 if (!arch_init_module(f, module))
2070 /* Whew! All of the initialization is complete. Collect the final
2071 module image and give it to the kernel. */
2073 image = xmalloc(m_size);
2074 obj_create_image(f, image);
2076 ret = new_sys_init_module(m_name, (struct new_module *) image);
2078 errorMsg("init_module: %s: %s", m_name, strerror(errno));
2087 #define new_init_module(x, y, z) TRUE
2088 #define new_create_this_module(x, y) 0
2089 #define new_create_module_ksymtab(x)
2091 #endif /* BB_FEATURE_INSMOD_OLD_KERNEL */
2094 /*======================================================================*/
2097 obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
2100 struct obj_string_patch *p;
2101 struct obj_section *strsec;
2102 size_t len = strlen(string) + 1;
2105 p = xmalloc(sizeof(*p));
2106 p->next = f->string_patches;
2107 p->reloc_secidx = secidx;
2108 p->reloc_offset = offset;
2109 f->string_patches = p;
2111 strsec = obj_find_section(f, ".kstrtab");
2112 if (strsec == NULL) {
2113 strsec = obj_create_alloced_section(f, ".kstrtab", 1, len);
2114 p->string_offset = 0;
2115 loc = strsec->contents;
2117 p->string_offset = strsec->header.sh_size;
2118 loc = obj_extend_section(strsec, len);
2120 memcpy(loc, string, len);
2126 obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
2127 struct obj_symbol *sym)
2129 struct obj_symbol_patch *p;
2131 p = xmalloc(sizeof(*p));
2132 p->next = f->symbol_patches;
2133 p->reloc_secidx = secidx;
2134 p->reloc_offset = offset;
2136 f->symbol_patches = p;
2141 int obj_check_undefineds(struct obj_file *f)
2146 for (i = 0; i < HASH_BUCKETS; ++i) {
2147 struct obj_symbol *sym;
2148 for (sym = f->symtab[i]; sym; sym = sym->next)
2149 if (sym->secidx == SHN_UNDEF) {
2150 if (ELFW(ST_BIND) (sym->info) == STB_WEAK) {
2151 sym->secidx = SHN_ABS;
2154 fprintf(stderr, "unresolved symbol %s\n", sym->name);
2163 void obj_allocate_commons(struct obj_file *f)
2165 struct common_entry {
2166 struct common_entry *next;
2167 struct obj_symbol *sym;
2168 } *common_head = NULL;
2172 for (i = 0; i < HASH_BUCKETS; ++i) {
2173 struct obj_symbol *sym;
2174 for (sym = f->symtab[i]; sym; sym = sym->next)
2175 if (sym->secidx == SHN_COMMON) {
2176 /* Collect all COMMON symbols and sort them by size so as to
2177 minimize space wasted by alignment requirements. */
2179 struct common_entry **p, *n;
2180 for (p = &common_head; *p; p = &(*p)->next)
2181 if (sym->size <= (*p)->sym->size)
2184 n = alloca(sizeof(*n));
2192 for (i = 1; i < f->local_symtab_size; ++i) {
2193 struct obj_symbol *sym = f->local_symtab[i];
2194 if (sym && sym->secidx == SHN_COMMON) {
2195 struct common_entry **p, *n;
2196 for (p = &common_head; *p; p = &(*p)->next)
2197 if (sym == (*p)->sym)
2199 else if (sym->size < (*p)->sym->size) {
2200 n = alloca(sizeof(*n));
2210 /* Find the bss section. */
2211 for (i = 0; i < f->header.e_shnum; ++i)
2212 if (f->sections[i]->header.sh_type == SHT_NOBITS)
2215 /* If for some reason there hadn't been one, create one. */
2216 if (i == f->header.e_shnum) {
2217 struct obj_section *sec;
2219 f->sections = xrealloc(f->sections, (i + 1) * sizeof(sec));
2220 f->sections[i] = sec = arch_new_section();
2221 f->header.e_shnum = i + 1;
2223 memset(sec, 0, sizeof(*sec));
2224 sec->header.sh_type = SHT_PROGBITS;
2225 sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
2230 /* Allocate the COMMONS. */
2232 ElfW(Addr) bss_size = f->sections[i]->header.sh_size;
2233 ElfW(Addr) max_align = f->sections[i]->header.sh_addralign;
2234 struct common_entry *c;
2236 for (c = common_head; c; c = c->next) {
2237 ElfW(Addr) align = c->sym->value;
2239 if (align > max_align)
2241 if (bss_size & (align - 1))
2242 bss_size = (bss_size | (align - 1)) + 1;
2245 c->sym->value = bss_size;
2247 bss_size += c->sym->size;
2250 f->sections[i]->header.sh_size = bss_size;
2251 f->sections[i]->header.sh_addralign = max_align;
2255 /* For the sake of patch relocation and parameter initialization,
2256 allocate zeroed data for NOBITS sections now. Note that after
2257 this we cannot assume NOBITS are really empty. */
2258 for (i = 0; i < f->header.e_shnum; ++i) {
2259 struct obj_section *s = f->sections[i];
2260 if (s->header.sh_type == SHT_NOBITS) {
2261 s->contents = memset(xmalloc(s->header.sh_size),
2262 0, s->header.sh_size);
2263 s->header.sh_type = SHT_PROGBITS;
2268 unsigned long obj_load_size(struct obj_file *f)
2270 unsigned long dot = 0;
2271 struct obj_section *sec;
2273 /* Finalize the positions of the sections relative to one another. */
2275 for (sec = f->load_order; sec; sec = sec->load_next) {
2278 align = sec->header.sh_addralign;
2279 if (align && (dot & (align - 1)))
2280 dot = (dot | (align - 1)) + 1;
2282 sec->header.sh_addr = dot;
2283 dot += sec->header.sh_size;
2289 int obj_relocate(struct obj_file *f, ElfW(Addr) base)
2291 int i, n = f->header.e_shnum;
2294 /* Finalize the addresses of the sections. */
2297 for (i = 0; i < n; ++i)
2298 f->sections[i]->header.sh_addr += base;
2300 /* And iterate over all of the relocations. */
2302 for (i = 0; i < n; ++i) {
2303 struct obj_section *relsec, *symsec, *targsec, *strsec;
2304 ElfW(RelM) * rel, *relend;
2308 relsec = f->sections[i];
2309 if (relsec->header.sh_type != SHT_RELM)
2312 symsec = f->sections[relsec->header.sh_link];
2313 targsec = f->sections[relsec->header.sh_info];
2314 strsec = f->sections[symsec->header.sh_link];
2316 rel = (ElfW(RelM) *) relsec->contents;
2317 relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
2318 symtab = (ElfW(Sym) *) symsec->contents;
2319 strtab = (const char *) strsec->contents;
2321 for (; rel < relend; ++rel) {
2322 ElfW(Addr) value = 0;
2323 struct obj_symbol *intsym = NULL;
2324 unsigned long symndx;
2325 ElfW(Sym) * extsym = 0;
2328 /* Attempt to find a value to use for this relocation. */
2330 symndx = ELFW(R_SYM) (rel->r_info);
2332 /* Note we've already checked for undefined symbols. */
2334 extsym = &symtab[symndx];
2335 if (ELFW(ST_BIND) (extsym->st_info) == STB_LOCAL) {
2336 /* Local symbols we look up in the local table to be sure
2337 we get the one that is really intended. */
2338 intsym = f->local_symtab[symndx];
2340 /* Others we look up in the hash table. */
2342 if (extsym->st_name)
2343 name = strtab + extsym->st_name;
2345 name = f->sections[extsym->st_shndx]->name;
2346 intsym = obj_find_symbol(f, name);
2349 value = obj_symbol_final_value(f, intsym);
2350 intsym->referenced = 1;
2352 #if SHT_RELM == SHT_RELA
2353 #if defined(__alpha__) && defined(AXP_BROKEN_GAS)
2354 /* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */
2355 if (!extsym || !extsym->st_name ||
2356 ELFW(ST_BIND) (extsym->st_info) != STB_LOCAL)
2358 value += rel->r_addend;
2362 switch (arch_apply_relocation
2363 (f, targsec, symsec, intsym, rel, value)) {
2367 case obj_reloc_overflow:
2368 errmsg = "Relocation overflow";
2370 case obj_reloc_dangerous:
2371 errmsg = "Dangerous relocation";
2373 case obj_reloc_unhandled:
2374 errmsg = "Unhandled relocation";
2377 fprintf(stderr, "%s of type %ld for %s\n", errmsg,
2378 (long) ELFW(R_TYPE) (rel->r_info),
2379 strtab + extsym->st_name);
2381 fprintf(stderr, "%s of type %ld\n", errmsg,
2382 (long) ELFW(R_TYPE) (rel->r_info));
2390 /* Finally, take care of the patches. */
2392 if (f->string_patches) {
2393 struct obj_string_patch *p;
2394 struct obj_section *strsec;
2395 ElfW(Addr) strsec_base;
2396 strsec = obj_find_section(f, ".kstrtab");
2397 strsec_base = strsec->header.sh_addr;
2399 for (p = f->string_patches; p; p = p->next) {
2400 struct obj_section *targsec = f->sections[p->reloc_secidx];
2401 *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
2402 = strsec_base + p->string_offset;
2406 if (f->symbol_patches) {
2407 struct obj_symbol_patch *p;
2409 for (p = f->symbol_patches; p; p = p->next) {
2410 struct obj_section *targsec = f->sections[p->reloc_secidx];
2411 *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
2412 = obj_symbol_final_value(f, p->sym);
2419 int obj_create_image(struct obj_file *f, char *image)
2421 struct obj_section *sec;
2422 ElfW(Addr) base = f->baseaddr;
2424 for (sec = f->load_order; sec; sec = sec->load_next) {
2427 if (sec->header.sh_size == 0)
2430 secimg = image + (sec->header.sh_addr - base);
2432 /* Note that we allocated data for NOBITS sections earlier. */
2433 memcpy(secimg, sec->contents, sec->header.sh_size);
2439 /*======================================================================*/
2441 struct obj_file *obj_load(FILE * fp)
2444 ElfW(Shdr) * section_headers;
2448 /* Read the file header. */
2450 f = arch_new_file();
2451 memset(f, 0, sizeof(*f));
2452 f->symbol_cmp = strcmp;
2453 f->symbol_hash = obj_elf_hash;
2454 f->load_order_search_start = &f->load_order;
2456 fseek(fp, 0, SEEK_SET);
2457 if (fread(&f->header, sizeof(f->header), 1, fp) != 1) {
2458 errorMsg("error reading ELF header: %s", strerror(errno));
2462 if (f->header.e_ident[EI_MAG0] != ELFMAG0
2463 || f->header.e_ident[EI_MAG1] != ELFMAG1
2464 || f->header.e_ident[EI_MAG2] != ELFMAG2
2465 || f->header.e_ident[EI_MAG3] != ELFMAG3) {
2466 fprintf(stderr, "not an ELF file\n");
2469 if (f->header.e_ident[EI_CLASS] != ELFCLASSM
2470 || f->header.e_ident[EI_DATA] != ELFDATAM
2471 || f->header.e_ident[EI_VERSION] != EV_CURRENT
2472 || !MATCH_MACHINE(f->header.e_machine)) {
2473 fprintf(stderr, "ELF file not for this architecture\n");
2476 if (f->header.e_type != ET_REL) {
2477 fprintf(stderr, "ELF file not a relocatable object\n");
2481 /* Read the section headers. */
2483 if (f->header.e_shentsize != sizeof(ElfW(Shdr))) {
2484 fprintf(stderr, "section header size mismatch: %lu != %lu\n",
2485 (unsigned long) f->header.e_shentsize,
2486 (unsigned long) sizeof(ElfW(Shdr)));
2490 shnum = f->header.e_shnum;
2491 f->sections = xmalloc(sizeof(struct obj_section *) * shnum);
2492 memset(f->sections, 0, sizeof(struct obj_section *) * shnum);
2494 section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
2495 fseek(fp, f->header.e_shoff, SEEK_SET);
2496 if (fread(section_headers, sizeof(ElfW(Shdr)), shnum, fp) != shnum) {
2497 errorMsg("error reading ELF section headers: %s", strerror(errno));
2501 /* Read the section data. */
2503 for (i = 0; i < shnum; ++i) {
2504 struct obj_section *sec;
2506 f->sections[i] = sec = arch_new_section();
2507 memset(sec, 0, sizeof(*sec));
2509 sec->header = section_headers[i];
2512 switch (sec->header.sh_type) {
2523 if (sec->header.sh_size > 0) {
2524 sec->contents = xmalloc(sec->header.sh_size);
2525 fseek(fp, sec->header.sh_offset, SEEK_SET);
2526 if (fread(sec->contents, sec->header.sh_size, 1, fp) != 1) {
2527 errorMsg("error reading ELF section data: %s", strerror(errno));
2531 sec->contents = NULL;
2535 #if SHT_RELM == SHT_REL
2538 "RELA relocations not supported on this architecture\n");
2543 "REL relocations not supported on this architecture\n");
2548 if (sec->header.sh_type >= SHT_LOPROC) {
2549 /* Assume processor specific section types are debug
2550 info and can safely be ignored. If this is ever not
2551 the case (Hello MIPS?), don't put ifdefs here but
2552 create an arch_load_proc_section(). */
2556 fprintf(stderr, "can't handle sections of type %ld\n",
2557 (long) sec->header.sh_type);
2562 /* Do what sort of interpretation as needed by each section. */
2564 shstrtab = f->sections[f->header.e_shstrndx]->contents;
2566 for (i = 0; i < shnum; ++i) {
2567 struct obj_section *sec = f->sections[i];
2568 sec->name = shstrtab + sec->header.sh_name;
2571 for (i = 0; i < shnum; ++i) {
2572 struct obj_section *sec = f->sections[i];
2574 if (sec->header.sh_flags & SHF_ALLOC)
2575 obj_insert_section_load_order(f, sec);
2577 switch (sec->header.sh_type) {
2580 unsigned long nsym, j;
2584 if (sec->header.sh_entsize != sizeof(ElfW(Sym))) {
2585 fprintf(stderr, "symbol size mismatch: %lu != %lu\n",
2586 (unsigned long) sec->header.sh_entsize,
2587 (unsigned long) sizeof(ElfW(Sym)));
2591 nsym = sec->header.sh_size / sizeof(ElfW(Sym));
2592 strtab = f->sections[sec->header.sh_link]->contents;
2593 sym = (ElfW(Sym) *) sec->contents;
2595 /* Allocate space for a table of local symbols. */
2596 j = f->local_symtab_size = sec->header.sh_info;
2597 f->local_symtab = xmalloc(j *=
2598 sizeof(struct obj_symbol *));
2599 memset(f->local_symtab, 0, j);
2601 /* Insert all symbols into the hash table. */
2602 for (j = 1, ++sym; j < nsym; ++j, ++sym) {
2605 name = strtab + sym->st_name;
2607 name = f->sections[sym->st_shndx]->name;
2609 obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx,
2610 sym->st_value, sym->st_size);
2616 if (sec->header.sh_entsize != sizeof(ElfW(RelM))) {
2618 "relocation entry size mismatch: %lu != %lu\n",
2619 (unsigned long) sec->header.sh_entsize,
2620 (unsigned long) sizeof(ElfW(RelM)));
2630 static void hide_special_symbols(struct obj_file *f)
2632 static const char *const specials[] = {
2639 struct obj_symbol *sym;
2640 const char *const *p;
2642 for (p = specials; *p; ++p)
2643 if ((sym = obj_find_symbol(f, *p)) != NULL)
2645 ELFW(ST_INFO) (STB_LOCAL, ELFW(ST_TYPE) (sym->info));
2650 extern int insmod_main( int argc, char **argv)
2656 unsigned long m_size;
2660 char m_name[BUFSIZ + 1] = "\0";
2661 int exit_status = FALSE;
2663 #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
2665 char k_strversion[STRVERSIONLEN];
2666 char m_strversion[STRVERSIONLEN];
2673 usage(insmod_usage);
2676 /* Parse any options */
2677 while (--argc > 0 && **(++argv) == '-') {
2678 while (*(++(*argv))) {
2680 case 'f': /* force loading */
2681 flag_force_load = 1;
2683 case 'k': /* module loaded by kerneld, auto-cleanable */
2686 case 'v': /* verbose output */
2689 case 'x': /* do not export externs */
2693 usage(insmod_usage);
2699 usage(insmod_usage);
2701 /* Grab the module name */
2702 if ((tmp = strrchr(*argv, '/')) != NULL) {
2709 if (len > 2 && tmp[len - 2] == '.' && tmp[len - 1] == 'o')
2711 memcpy(m_name, tmp, len);
2712 strcpy(m_fullName, m_name);
2713 strcat(m_fullName, ".o");
2715 /* Get a filedesc for the module */
2716 if ((fp = fopen(*argv, "r")) == NULL) {
2717 /* Hmpf. Could not open it. Search through _PATH_MODULES to find a module named m_name */
2718 if (recursiveAction(_PATH_MODULES, TRUE, FALSE, FALSE,
2719 findNamedModule, 0, m_fullName) == TRUE)
2721 if (m_filename[0] == '\0'
2722 || ((fp = fopen(m_filename, "r")) == NULL))
2724 errorMsg("No module named '%s' found in '%s'\n", m_fullName, _PATH_MODULES);
2729 memcpy(m_filename, *argv, strlen(*argv));
2732 if ((f = obj_load(fp)) == NULL) {
2733 perror("Could not load the module\n");
2737 if (get_modinfo_value(f, "kernel_version") == NULL)
2742 #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
2743 /* Version correspondence? */
2745 k_version = get_kernel_version(k_strversion);
2746 if (m_has_modinfo) {
2747 m_version = new_get_module_version(f, m_strversion);
2749 m_version = old_get_module_version(f, m_strversion);
2750 if (m_version == -1) {
2752 "couldn't find the kernel version the module was compiled for\n");
2757 if (strncmp(k_strversion, m_strversion, STRVERSIONLEN) != 0) {
2758 if (flag_force_load) {
2759 fprintf(stderr, "Warning: kernel-module version mismatch\n"
2760 "\t%s was compiled for kernel version %s\n"
2761 "\twhile this kernel is version %s\n",
2762 m_filename, m_strversion, k_strversion);
2764 fprintf(stderr, "kernel-module version mismatch\n"
2765 "\t%s was compiled for kernel version %s\n"
2766 "\twhile this kernel is version %s.\n",
2767 m_filename, m_strversion, k_strversion);
2772 #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
2774 k_new_syscalls = !query_module(NULL, 0, NULL, 0, NULL);
2776 if (k_new_syscalls) {
2777 #ifdef BB_FEATURE_INSMOD_NEW_KERNEL
2778 if (!new_get_kernel_symbols())
2780 k_crcs = new_is_kernel_checksummed();
2782 fprintf(stderr, "Not configured to support new kernels\n");
2786 #ifdef BB_FEATURE_INSMOD_OLD_KERNEL
2787 if (!old_get_kernel_symbols())
2789 k_crcs = old_is_kernel_checksummed();
2791 fprintf(stderr, "Not configured to support old kernels\n");
2796 #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
2798 m_crcs = new_is_module_checksummed(f);
2800 m_crcs = old_is_module_checksummed(f);
2802 if (m_crcs != k_crcs)
2803 obj_set_symbol_compare(f, ncv_strcmp, ncv_symbol_hash);
2804 #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
2806 /* Let the module know about the kernel symbols. */
2807 add_kernel_symbols(f);
2809 /* Allocate common symbols, symbol tables, and string tables. */
2812 ? !new_create_this_module(f, m_name)
2813 : !old_create_mod_use_count(f))
2818 if (!obj_check_undefineds(f)) {
2821 obj_allocate_commons(f);
2823 if (optind < argc) {
2825 ? !new_process_module_arguments(f, argc - optind, argv + optind)
2826 : !old_process_module_arguments(f, argc - optind, argv + optind))
2833 hide_special_symbols(f);
2836 new_create_module_ksymtab(f);
2838 /* Find current size of the module */
2839 m_size = obj_load_size(f);
2843 m_addr = create_module(m_name, m_size);
2848 fprintf(stderr, "A module named %s already exists\n", m_name);
2852 "Can't allocate kernel memory for module; needed %lu bytes\n",
2856 errorMsg("create_module: %s: %s", m_name, strerror(errno));
2860 if (!obj_relocate(f, m_addr)) {
2861 delete_module(m_name);
2866 ? !new_init_module(m_name, f, m_size)
2867 : !old_init_module(m_name, f, m_size))
2869 delete_module(m_name);
2877 return(exit_status);