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busybox/modutils/insmod.c
Eric Andersen bb245ba0c2 Made insmod work with both libc5 and libc6. 
-Erik
2000-06-19 19:53:30 +00:00

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/* vi: set sw=4 ts=4: */
/*
* Mini insmod implementation for busybox
*
* Copyright (C) 1999,2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>
* and Ron Alder <alder@lineo.com>
*
* Based almost entirely on the Linux modutils-2.3.11 implementation.
* Copyright 1996, 1997 Linux International.
* New implementation contributed by Richard Henderson <rth@tamu.edu>
* Based on original work by Bjorn Ekwall <bj0rn@blox.se>
* Restructured (and partly rewritten) by:
* Björn Ekwall <bj0rn@blox.se> February 1999
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>
#include <assert.h>
#include <sys/utsname.h>
#include <sys/syscall.h>
#include <linux/unistd.h>
//----------------------------------------------------------------------------
//--------modutils module.h, lines 45-242
//----------------------------------------------------------------------------
/* Definitions for the Linux module syscall interface.
Copyright 1996, 1997 Linux International.
Contributed by Richard Henderson <rth@tamu.edu>
This file is part of the Linux modutils.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef MODUTILS_MODULE_H
#define MODUTILS_MODULE_H 1
#ident "$Id: insmod.c,v 1.9 2000/06/19 19:53:30 andersen Exp $"
/* This file contains the structures used by the 2.0 and 2.1 kernels.
We do not use the kernel headers directly because we do not wish
to be dependant on a particular kernel version to compile insmod. */
/*======================================================================*/
/* The structures used by Linux 2.0. */
/* The symbol format used by get_kernel_syms(2). */
struct old_kernel_sym
{
unsigned long value;
char name[60];
};
struct old_module_ref
{
unsigned long module; /* kernel addresses */
unsigned long next;
};
struct old_module_symbol
{
unsigned long addr;
unsigned long name;
};
struct old_symbol_table
{
int size; /* total, including string table!!! */
int n_symbols;
int n_refs;
struct old_module_symbol symbol[0]; /* actual size defined by n_symbols */
struct old_module_ref ref[0]; /* actual size defined by n_refs */
};
struct old_mod_routines
{
unsigned long init;
unsigned long cleanup;
};
struct old_module
{
unsigned long next;
unsigned long ref; /* the list of modules that refer to me */
unsigned long symtab;
unsigned long name;
int size; /* size of module in pages */
unsigned long addr; /* address of module */
int state;
unsigned long cleanup; /* cleanup routine */
};
/* Sent to init_module(2) or'ed into the code size parameter. */
#define OLD_MOD_AUTOCLEAN 0x40000000 /* big enough, but no sign problems... */
int get_kernel_syms(struct old_kernel_sym *);
int old_sys_init_module(const char *name, char *code, unsigned codesize,
struct old_mod_routines *, struct old_symbol_table *);
/*======================================================================*/
/* For sizeof() which are related to the module platform and not to the
environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */
#define tgt_sizeof_char sizeof(char)
#define tgt_sizeof_short sizeof(short)
#define tgt_sizeof_int sizeof(int)
#define tgt_sizeof_long sizeof(long)
#define tgt_sizeof_char_p sizeof(char *)
#define tgt_sizeof_void_p sizeof(void *)
#define tgt_long long
#if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64)
#undef tgt_sizeof_long
#undef tgt_sizeof_char_p
#undef tgt_sizeof_void_p
#undef tgt_long
#define tgt_sizeof_long 8
#define tgt_sizeof_char_p 8
#define tgt_sizeof_void_p 8
#define tgt_long long long
#endif
/*======================================================================*/
/* The structures used in Linux 2.1. */
/* Note: new_module_symbol does not use tgt_long intentionally */
struct new_module_symbol
{
unsigned long value;
unsigned long name;
};
struct new_module_persist;
struct new_module_ref
{
unsigned tgt_long dep; /* kernel addresses */
unsigned tgt_long ref;
unsigned tgt_long next_ref;
};
struct new_module
{
unsigned tgt_long size_of_struct; /* == sizeof(module) */
unsigned tgt_long next;
unsigned tgt_long name;
unsigned tgt_long size;
tgt_long usecount;
unsigned tgt_long flags; /* AUTOCLEAN et al */
unsigned nsyms;
unsigned ndeps;
unsigned tgt_long syms;
unsigned tgt_long deps;
unsigned tgt_long refs;
unsigned tgt_long init;
unsigned tgt_long cleanup;
unsigned tgt_long ex_table_start;
unsigned tgt_long ex_table_end;
#ifdef __alpha__
unsigned tgt_long gp;
#endif
/* Everything after here is extension. */
unsigned tgt_long persist_start;
unsigned tgt_long persist_end;
unsigned tgt_long can_unload;
unsigned tgt_long runsize;
};
struct new_module_info
{
unsigned long addr;
unsigned long size;
unsigned long flags;
long usecount;
};
/* Bits of module.flags. */
#define NEW_MOD_RUNNING 1
#define NEW_MOD_DELETED 2
#define NEW_MOD_AUTOCLEAN 4
#define NEW_MOD_VISITED 8
#define NEW_MOD_USED_ONCE 16
int new_sys_init_module(const char *name, const struct new_module *);
int query_module(const char *name, int which, void *buf, size_t bufsize,
size_t *ret);
/* Values for query_module's which. */
#define QM_MODULES 1
#define QM_DEPS 2
#define QM_REFS 3
#define QM_SYMBOLS 4
#define QM_INFO 5
/*======================================================================*/
/* The system calls unchanged between 2.0 and 2.1. */
unsigned long create_module(const char *, size_t);
int delete_module(const char *);
#endif /* module.h */
//----------------------------------------------------------------------------
//--------end of modutils module.h
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
//--------modutils obj.h, lines 253-462
//----------------------------------------------------------------------------
/* Elf object file loading and relocation routines.
Copyright 1996, 1997 Linux International.
Contributed by Richard Henderson <rth@tamu.edu>
This file is part of the Linux modutils.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef MODUTILS_OBJ_H
#define MODUTILS_OBJ_H 1
#ident "$Id: insmod.c,v 1.9 2000/06/19 19:53:30 andersen Exp $"
/* The relocatable object is manipulated using elfin types. */
#include <stdio.h>
#include <elf.h>
/* Machine-specific elf macros for i386 et al. */
#define ELFCLASSM ELFCLASS32
#define ELFDATAM ELFDATA2LSB
#define MATCH_MACHINE(x) (x == EM_386 || x == EM_486)
#define SHT_RELM SHT_REL
#define Elf32_RelM Elf32_Rel
#ifndef ElfW
# if ELFCLASSM == ELFCLASS32
# define ElfW(x) Elf32_ ## x
# define ELFW(x) ELF32_ ## x
# else
# define ElfW(x) Elf64_ ## x
# define ELFW(x) ELF64_ ## x
# endif
#endif
/* For some reason this is missing from libc5. */
#ifndef ELF32_ST_INFO
# define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
#endif
#ifndef ELF64_ST_INFO
# define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
#endif
struct obj_string_patch;
struct obj_symbol_patch;
struct obj_section
{
ElfW(Shdr) header;
const char *name;
char *contents;
struct obj_section *load_next;
int idx;
};
struct obj_symbol
{
struct obj_symbol *next; /* hash table link */
const char *name;
unsigned long value;
unsigned long size;
int secidx; /* the defining section index/module */
int info;
int ksymidx; /* for export to the kernel symtab */
int referenced; /* actually used in the link */
};
/* Hardcode the hash table size. We shouldn't be needing so many
symbols that we begin to degrade performance, and we get a big win
by giving the compiler a constant divisor. */
#define HASH_BUCKETS 521
struct obj_file
{
ElfW(Ehdr) header;
ElfW(Addr) baseaddr;
struct obj_section **sections;
struct obj_section *load_order;
struct obj_section **load_order_search_start;
struct obj_string_patch *string_patches;
struct obj_symbol_patch *symbol_patches;
int (*symbol_cmp)(const char *, const char *);
unsigned long (*symbol_hash)(const char *);
unsigned long local_symtab_size;
struct obj_symbol **local_symtab;
struct obj_symbol *symtab[HASH_BUCKETS];
};
enum obj_reloc
{
obj_reloc_ok,
obj_reloc_overflow,
obj_reloc_dangerous,
obj_reloc_unhandled
};
struct obj_string_patch
{
struct obj_string_patch *next;
int reloc_secidx;
ElfW(Addr) reloc_offset;
ElfW(Addr) string_offset;
};
struct obj_symbol_patch
{
struct obj_symbol_patch *next;
int reloc_secidx;
ElfW(Addr) reloc_offset;
struct obj_symbol *sym;
};
/* Generic object manipulation routines. */
unsigned long obj_elf_hash(const char *);
unsigned long obj_elf_hash_n(const char *, unsigned long len);
struct obj_symbol *obj_add_symbol (struct obj_file *f, const char *name,
unsigned long symidx, int info, int secidx,
ElfW(Addr) value, unsigned long size);
struct obj_symbol *obj_find_symbol (struct obj_file *f,
const char *name);
ElfW(Addr) obj_symbol_final_value(struct obj_file *f,
struct obj_symbol *sym);
void obj_set_symbol_compare(struct obj_file *f,
int (*cmp)(const char *, const char *),
unsigned long (*hash)(const char *));
struct obj_section *obj_find_section (struct obj_file *f,
const char *name);
void obj_insert_section_load_order (struct obj_file *f,
struct obj_section *sec);
struct obj_section *obj_create_alloced_section (struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size);
struct obj_section *obj_create_alloced_section_first (struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size);
void *obj_extend_section (struct obj_section *sec, unsigned long more);
int obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
const char *string);
int obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
struct obj_symbol *sym);
int obj_check_undefineds(struct obj_file *f);
void obj_allocate_commons(struct obj_file *f);
unsigned long obj_load_size (struct obj_file *f);
int obj_relocate (struct obj_file *f, ElfW(Addr) base);
struct obj_file *obj_load(FILE *f);
int obj_create_image (struct obj_file *f, char *image);
/* Architecture specific manipulation routines. */
struct obj_file *arch_new_file (void);
struct obj_section *arch_new_section (void);
struct obj_symbol *arch_new_symbol (void);
enum obj_reloc arch_apply_relocation (struct obj_file *f,
struct obj_section *targsec,
struct obj_section *symsec,
struct obj_symbol *sym,
ElfW(RelM) *rel, ElfW(Addr) value);
int arch_create_got (struct obj_file *f);
struct new_module;
int arch_init_module (struct obj_file *f, struct new_module *);
#endif /* obj.h */
//----------------------------------------------------------------------------
//--------end of modutils obj.h
//----------------------------------------------------------------------------
#define _PATH_MODULES "/lib/modules"
#define STRVERSIONLEN 32
#if !defined(BB_FEATURE_INSMOD_NEW_KERNEL) && !defined(BB_FEATURE_INSMOD_OLD_KERNEL)
#error "Must have ether BB_FEATURE_INSMOD_NEW_KERNEL or BB_FEATURE_INSMOD_OLD_KERNEL defined"
#endif
/*======================================================================*/
int flag_force_load = 0;
int flag_autoclean = 0;
int flag_verbose = 0;
int flag_export = 1;
/*======================================================================*/
struct i386_got_entry {
int offset;
unsigned offset_done:1;
unsigned reloc_done:1;
};
struct i386_file {
struct obj_file root;
struct obj_section *got;
};
struct i386_symbol {
struct obj_symbol root;
struct i386_got_entry gotent;
};
struct external_module {
const char *name;
ElfW(Addr) addr;
int used;
size_t nsyms;
struct new_module_symbol *syms;
};
struct new_module_symbol *ksyms;
size_t nksyms;
struct external_module *ext_modules;
int n_ext_modules;
int n_ext_modules_used;
/* Some firendly syscalls to cheer everyone's day... */
#define __NR_new_sys_init_module __NR_init_module
_syscall2(int, new_sys_init_module, const char *, name,
const struct new_module *, info)
#define __NR_old_sys_init_module __NR_init_module
_syscall5(int, old_sys_init_module, const char *, name, char *, code,
unsigned, codesize, struct old_mod_routines *, routines,
struct old_symbol_table *, symtab)
_syscall5(int, query_module, const char *, name, int, which,
void *, buf, size_t, bufsize, size_t*, ret);
#ifndef BB_RMMOD
_syscall1(int, delete_module, const char *, name)
#else
extern int delete_module(const char *);
#endif
#if defined(__i386__) || defined(__m68k__) || defined(__arm__)
/* Jump through hoops to fixup error return codes */
#define __NR__create_module __NR_create_module
static inline _syscall2(long, _create_module, const char *, name, size_t,
size)
unsigned long create_module(const char *name, size_t size)
{
long ret = _create_module(name, size);
if (ret == -1 && errno > 125) {
ret = -errno;
errno = 0;
}
return ret;
}
#else
_syscall2(unsigned long, create_module, const char *, name, size_t, size)
#endif
static char m_filename[BUFSIZ + 1] = "\0";
static char m_fullName[BUFSIZ + 1] = "\0";
static const char insmod_usage[] =
"insmod [OPTION]... MODULE [symbol=value]...\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nLoads the specified kernel modules into the kernel.\n\n"
"Options:\n"
"\t-f\tForce module to load into the wrong kernel version.\n"
"\t-k\tMake module autoclean-able.\n"
"\t-v\tverbose output\n" "\t-x\tdo not export externs\n"
#endif
;
/*======================================================================*/
void *xrealloc(void *old, size_t size)
{
void *ptr = realloc(old, size);
if (!ptr) {
perror("Out of memory");
exit(1);
}
return ptr;
}
static int findNamedModule(const char *fileName, struct stat *statbuf,
void *userDate)
{
char *fullName = (char *) userDate;
if (fullName[0] == '\0')
return (FALSE);
else {
char *tmp = strrchr(fileName, '/');
if (tmp == NULL)
tmp = (char *) fileName;
else
tmp++;
if (check_wildcard_match(tmp, fullName) == TRUE) {
/* Stop searching if we find a match */
memcpy(m_filename, fileName, strlen(fileName));
return (FALSE);
}
}
return (TRUE);
}
/*======================================================================*/
struct obj_file *arch_new_file(void)
{
struct i386_file *f;
f = xmalloc(sizeof(*f));
f->got = NULL;
return &f->root;
}
struct obj_section *arch_new_section(void)
{
return xmalloc(sizeof(struct obj_section));
}
struct obj_symbol *arch_new_symbol(void)
{
struct i386_symbol *sym;
sym = xmalloc(sizeof(*sym));
memset(&sym->gotent, 0, sizeof(sym->gotent));
return &sym->root;
}
enum obj_reloc
arch_apply_relocation(struct obj_file *f,
struct obj_section *targsec,
struct obj_section *symsec,
struct obj_symbol *sym,
Elf32_Rel * rel, Elf32_Addr v)
{
struct i386_file *ifile = (struct i386_file *) f;
struct i386_symbol *isym = (struct i386_symbol *) sym;
Elf32_Addr *loc = (Elf32_Addr *) (targsec->contents + rel->r_offset);
Elf32_Addr dot = targsec->header.sh_addr + rel->r_offset;
Elf32_Addr got = ifile->got ? ifile->got->header.sh_addr : 0;
enum obj_reloc ret = obj_reloc_ok;
switch (ELF32_R_TYPE(rel->r_info)) {
case R_386_NONE:
break;
case R_386_32:
*loc += v;
break;
case R_386_PLT32:
case R_386_PC32:
*loc += v - dot;
break;
case R_386_GLOB_DAT:
case R_386_JMP_SLOT:
*loc = v;
break;
case R_386_RELATIVE:
*loc += f->baseaddr;
break;
case R_386_GOTPC:
assert(got != 0);
*loc += got - dot;
break;
case R_386_GOT32:
assert(isym != NULL);
if (!isym->gotent.reloc_done) {
isym->gotent.reloc_done = 1;
*(Elf32_Addr *) (ifile->got->contents + isym->gotent.offset) =
v;
}
*loc += isym->gotent.offset;
break;
case R_386_GOTOFF:
assert(got != 0);
*loc += v - got;
break;
default:
ret = obj_reloc_unhandled;
break;
}
return ret;
}
int arch_create_got(struct obj_file *f)
{
struct i386_file *ifile = (struct i386_file *) f;
int i, n, offset = 0, gotneeded = 0;
n = ifile->root.header.e_shnum;
for (i = 0; i < n; ++i) {
struct obj_section *relsec, *symsec, *strsec;
Elf32_Rel *rel, *relend;
Elf32_Sym *symtab;
const char *strtab;
relsec = ifile->root.sections[i];
if (relsec->header.sh_type != SHT_REL)
continue;
symsec = ifile->root.sections[relsec->header.sh_link];
strsec = ifile->root.sections[symsec->header.sh_link];
rel = (Elf32_Rel *) relsec->contents;
relend = rel + (relsec->header.sh_size / sizeof(Elf32_Rel));
symtab = (Elf32_Sym *) symsec->contents;
strtab = (const char *) strsec->contents;
for (; rel < relend; ++rel) {
Elf32_Sym *extsym;
struct i386_symbol *intsym;
const char *name;
switch (ELF32_R_TYPE(rel->r_info)) {
case R_386_GOTPC:
case R_386_GOTOFF:
gotneeded = 1;
default:
continue;
case R_386_GOT32:
break;
}
extsym = &symtab[ELF32_R_SYM(rel->r_info)];
if (extsym->st_name)
name = strtab + extsym->st_name;
else
name = f->sections[extsym->st_shndx]->name;
intsym =
(struct i386_symbol *) obj_find_symbol(&ifile->root, name);
if (!intsym->gotent.offset_done) {
intsym->gotent.offset_done = 1;
intsym->gotent.offset = offset;
offset += 4;
}
}
}
if (offset > 0 || gotneeded)
ifile->got =
obj_create_alloced_section(&ifile->root, ".got", 4, offset);
return 1;
}
int arch_init_module(struct obj_file *f, struct new_module *mod)
{
return 1;
}
/*======================================================================*/
/* Standard ELF hash function. */
inline unsigned long obj_elf_hash_n(const char *name, unsigned long n)
{
unsigned long h = 0;
unsigned long g;
unsigned char ch;
while (n > 0) {
ch = *name++;
h = (h << 4) + ch;
if ((g = (h & 0xf0000000)) != 0) {
h ^= g >> 24;
h &= ~g;
}
n--;
}
return h;
}
unsigned long obj_elf_hash(const char *name)
{
return obj_elf_hash_n(name, strlen(name));
}
#ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
/* Get the kernel version in the canonical integer form. */
static int get_kernel_version(char str[STRVERSIONLEN])
{
struct utsname uts_info;
char *p, *q;
int a, b, c;
if (uname(&uts_info) < 0)
return -1;
strncpy(str, uts_info.release, STRVERSIONLEN);
p = uts_info.release;
a = strtoul(p, &p, 10);
if (*p != '.')
return -1;
b = strtoul(p + 1, &p, 10);
if (*p != '.')
return -1;
c = strtoul(p + 1, &q, 10);
if (p + 1 == q)
return -1;
return a << 16 | b << 8 | c;
}
/* String comparison for non-co-versioned kernel and module. */
static int ncv_strcmp(const char *a, const char *b)
{
size_t alen = strlen(a), blen = strlen(b);
if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R')
return strncmp(a, b, alen);
else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R')
return strncmp(a, b, blen);
else
return strcmp(a, b);
}
/* String hashing for non-co-versioned kernel and module. Here
we are simply forced to drop the crc from the hash. */
static unsigned long ncv_symbol_hash(const char *str)
{
size_t len = strlen(str);
if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R')
len -= 10;
return obj_elf_hash_n(str, len);
}
void
obj_set_symbol_compare(struct obj_file *f,
int (*cmp) (const char *, const char *),
unsigned long (*hash) (const char *))
{
if (cmp)
f->symbol_cmp = cmp;
if (hash) {
struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next;
int i;
f->symbol_hash = hash;
memcpy(tmptab, f->symtab, sizeof(tmptab));
memset(f->symtab, 0, sizeof(f->symtab));
for (i = 0; i < HASH_BUCKETS; ++i)
for (sym = tmptab[i]; sym; sym = next) {
unsigned long h = hash(sym->name) % HASH_BUCKETS;
next = sym->next;
sym->next = f->symtab[h];
f->symtab[h] = sym;
}
}
}
#endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
struct obj_symbol *obj_add_symbol(struct obj_file *f, const char *name,
unsigned long symidx, int info,
int secidx, ElfW(Addr) value,
unsigned long size)
{
struct obj_symbol *sym;
unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
int n_type = ELFW(ST_TYPE) (info);
int n_binding = ELFW(ST_BIND) (info);
for (sym = f->symtab[hash]; sym; sym = sym->next)
if (f->symbol_cmp(sym->name, name) == 0) {
int o_secidx = sym->secidx;
int o_info = sym->info;
int o_type = ELFW(ST_TYPE) (o_info);
int o_binding = ELFW(ST_BIND) (o_info);
/* A redefinition! Is it legal? */
if (secidx == SHN_UNDEF)
return sym;
else if (o_secidx == SHN_UNDEF)
goto found;
else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) {
/* Cope with local and global symbols of the same name
in the same object file, as might have been created
by ld -r. The only reason locals are now seen at this
level at all is so that we can do semi-sensible things
with parameters. */
struct obj_symbol *nsym, **p;
nsym = arch_new_symbol();
nsym->next = sym->next;
nsym->ksymidx = -1;
/* Excise the old (local) symbol from the hash chain. */
for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next)
continue;
*p = sym = nsym;
goto found;
} else if (n_binding == STB_LOCAL) {
/* Another symbol of the same name has already been defined.
Just add this to the local table. */
sym = arch_new_symbol();
sym->next = NULL;
sym->ksymidx = -1;
f->local_symtab[symidx] = sym;
goto found;
} else if (n_binding == STB_WEAK)
return sym;
else if (o_binding == STB_WEAK)
goto found;
/* Don't unify COMMON symbols with object types the programmer
doesn't expect. */
else if (secidx == SHN_COMMON
&& (o_type == STT_NOTYPE || o_type == STT_OBJECT))
return sym;
else if (o_secidx == SHN_COMMON
&& (n_type == STT_NOTYPE || n_type == STT_OBJECT))
goto found;
else {
/* Don't report an error if the symbol is coming from
the kernel or some external module. */
if (secidx <= SHN_HIRESERVE)
fprintf(stderr, "%s multiply defined\n", name);
return sym;
}
}
/* Completely new symbol. */
sym = arch_new_symbol();
sym->next = f->symtab[hash];
f->symtab[hash] = sym;
sym->ksymidx = -1;
if (ELFW(ST_BIND) (info) == STB_LOCAL)
f->local_symtab[symidx] = sym;
found:
sym->name = name;
sym->value = value;
sym->size = size;
sym->secidx = secidx;
sym->info = info;
return sym;
}
struct obj_symbol *obj_find_symbol(struct obj_file *f, const char *name)
{
struct obj_symbol *sym;
unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
for (sym = f->symtab[hash]; sym; sym = sym->next)
if (f->symbol_cmp(sym->name, name) == 0)
return sym;
return NULL;
}
ElfW(Addr)
obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym)
{
if (sym) {
if (sym->secidx >= SHN_LORESERVE)
return sym->value;
return sym->value + f->sections[sym->secidx]->header.sh_addr;
} else {
/* As a special case, a NULL sym has value zero. */
return 0;
}
}
struct obj_section *obj_find_section(struct obj_file *f, const char *name)
{
int i, n = f->header.e_shnum;
for (i = 0; i < n; ++i)
if (strcmp(f->sections[i]->name, name) == 0)
return f->sections[i];
return NULL;
}
static int obj_load_order_prio(struct obj_section *a)
{
unsigned long af, ac;
af = a->header.sh_flags;
ac = 0;
if (a->name[0] != '.' || strlen(a->name) != 10 ||
strcmp(a->name + 5, ".init"))
ac |= 32;
if (af & SHF_ALLOC)
ac |= 16;
if (!(af & SHF_WRITE))
ac |= 8;
if (af & SHF_EXECINSTR)
ac |= 4;
if (a->header.sh_type != SHT_NOBITS)
ac |= 2;
return ac;
}
void
obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec)
{
struct obj_section **p;
int prio = obj_load_order_prio(sec);
for (p = f->load_order_search_start; *p; p = &(*p)->load_next)
if (obj_load_order_prio(*p) < prio)
break;
sec->load_next = *p;
*p = sec;
}
struct obj_section *obj_create_alloced_section(struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size)
{
int newidx = f->header.e_shnum++;
struct obj_section *sec;
f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec));
f->sections[newidx] = sec = arch_new_section();
memset(sec, 0, sizeof(*sec));
sec->header.sh_type = SHT_PROGBITS;
sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
sec->header.sh_size = size;
sec->header.sh_addralign = align;
sec->name = name;
sec->idx = newidx;
if (size)
sec->contents = xmalloc(size);
obj_insert_section_load_order(f, sec);
return sec;
}
struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size)
{
int newidx = f->header.e_shnum++;
struct obj_section *sec;
f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec));
f->sections[newidx] = sec = arch_new_section();
memset(sec, 0, sizeof(*sec));
sec->header.sh_type = SHT_PROGBITS;
sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
sec->header.sh_size = size;
sec->header.sh_addralign = align;
sec->name = name;
sec->idx = newidx;
if (size)
sec->contents = xmalloc(size);
sec->load_next = f->load_order;
f->load_order = sec;
if (f->load_order_search_start == &f->load_order)
f->load_order_search_start = &sec->load_next;
return sec;
}
void *obj_extend_section(struct obj_section *sec, unsigned long more)
{
unsigned long oldsize = sec->header.sh_size;
sec->contents = xrealloc(sec->contents, sec->header.sh_size += more);
return sec->contents + oldsize;
}
/* Conditionally add the symbols from the given symbol set to the
new module. */
static int
add_symbols_from(
struct obj_file *f,
int idx, struct new_module_symbol *syms, size_t nsyms)
{
struct new_module_symbol *s;
size_t i;
int used = 0;
for (i = 0, s = syms; i < nsyms; ++i, ++s) {
/* Only add symbols that are already marked external. If we
override locals we may cause problems for argument initialization.
We will also create a false dependency on the module. */
struct obj_symbol *sym;
sym = obj_find_symbol(f, (char *) s->name);
if (sym && !ELFW(ST_BIND) (sym->info) == STB_LOCAL) {
sym = obj_add_symbol(f, (char *) s->name, -1,
ELFW(ST_INFO) (STB_GLOBAL, STT_NOTYPE),
idx, s->value, 0);
/* Did our symbol just get installed? If so, mark the
module as "used". */
if (sym->secidx == idx)
used = 1;
}
}
return used;
}
static void add_kernel_symbols(struct obj_file *f)
{
struct external_module *m;
size_t i, nused = 0;
/* Add module symbols first. */
for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m)
if (m->nsyms
&& add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms,
m->nsyms)) m->used = 1, ++nused;
n_ext_modules_used = nused;
/* And finally the symbols from the kernel proper. */
if (nksyms)
add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms);
}
static char *get_modinfo_value(struct obj_file *f, const char *key)
{
struct obj_section *sec;
char *p, *v, *n, *ep;
size_t klen = strlen(key);
sec = obj_find_section(f, ".modinfo");
if (sec == NULL)
return NULL;
p = sec->contents;
ep = p + sec->header.sh_size;
while (p < ep) {
v = strchr(p, '=');
n = strchr(p, '\0');
if (v) {
if (v - p == klen && strncmp(p, key, klen) == 0)
return v + 1;
} else {
if (n - p == klen && strcmp(p, key) == 0)
return n;
}
p = n + 1;
}
return NULL;
}
/*======================================================================*/
/* Functions relating to module loading in pre 2.1 kernels. */
static int
old_process_module_arguments(struct obj_file *f, int argc, char **argv)
{
while (argc > 0) {
char *p, *q;
struct obj_symbol *sym;
int *loc;
p = *argv;
if ((q = strchr(p, '=')) == NULL)
continue;
*q++ = '\0';
sym = obj_find_symbol(f, p);
/* Also check that the parameter was not resolved from the kernel. */
if (sym == NULL || sym->secidx > SHN_HIRESERVE) {
fprintf(stderr, "symbol for parameter %s not found\n", p);
return 0;
}
loc = (int *) (f->sections[sym->secidx]->contents + sym->value);
/* Do C quoting if we begin with a ". */
if (*q == '"') {
char *r, *str;
str = alloca(strlen(q));
for (r = str, q++; *q != '"'; ++q, ++r) {
if (*q == '\0') {
fprintf(stderr,
"improperly terminated string argument for %s\n",
p);
return 0;
} else if (*q == '\\')
switch (*++q) {
case 'a':
*r = '\a';
break;
case 'b':
*r = '\b';
break;
case 'e':
*r = '\033';
break;
case 'f':
*r = '\f';
break;
case 'n':
*r = '\n';
break;
case 'r':
*r = '\r';
break;
case 't':
*r = '\t';
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
{
int c = *q - '0';
if (q[1] >= '0' && q[1] <= '7') {
c = (c * 8) + *++q - '0';
if (q[1] >= '0' && q[1] <= '7')
c = (c * 8) + *++q - '0';
}
*r = c;
}
break;
default:
*r = *q;
break;
} else
*r = *q;
}
*r = '\0';
obj_string_patch(f, sym->secidx, sym->value, str);
} else if (*q >= '0' && *q <= '9') {
do
*loc++ = strtoul(q, &q, 0);
while (*q++ == ',');
} else {
char *contents = f->sections[sym->secidx]->contents;
char *loc = contents + sym->value;
char *r; /* To search for commas */
/* Break the string with comas */
while ((r = strchr(q, ',')) != (char *) NULL) {
*r++ = '\0';
obj_string_patch(f, sym->secidx, loc - contents, q);
loc += sizeof(char *);
q = r;
}
/* last part */
obj_string_patch(f, sym->secidx, loc - contents, q);
}
argc--, argv++;
}
return 1;
}
#ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
static int old_is_module_checksummed(struct obj_file *f)
{
return obj_find_symbol(f, "Using_Versions") != NULL;
}
/* Get the module's kernel version in the canonical integer form. */
static int
old_get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
{
struct obj_symbol *sym;
char *p, *q;
int a, b, c;
sym = obj_find_symbol(f, "kernel_version");
if (sym == NULL)
return -1;
p = f->sections[sym->secidx]->contents + sym->value;
strncpy(str, p, STRVERSIONLEN);
a = strtoul(p, &p, 10);
if (*p != '.')
return -1;
b = strtoul(p + 1, &p, 10);
if (*p != '.')
return -1;
c = strtoul(p + 1, &q, 10);
if (p + 1 == q)
return -1;
return a << 16 | b << 8 | c;
}
#endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
#ifdef BB_FEATURE_INSMOD_OLD_KERNEL
/* Fetch all the symbols and divvy them up as appropriate for the modules. */
static int old_get_kernel_symbols(void)
{
struct old_kernel_sym *ks, *k;
struct new_module_symbol *s;
struct external_module *mod;
int nks, nms, nmod, i;
nks = get_kernel_syms(NULL);
if (nks < 0) {
perror("get_kernel_syms: %m");
return 0;
}
ks = k = xmalloc(nks * sizeof(*ks));
if (get_kernel_syms(ks) != nks) {
perror("inconsistency with get_kernel_syms -- is someone else "
"playing with modules?");
free(ks);
return 0;
}
/* Collect the module information. */
mod = NULL;
nmod = -1;
while (k->name[0] == '#' && k->name[1]) {
struct old_kernel_sym *k2;
struct new_module_symbol *s;
/* Find out how many symbols this module has. */
for (k2 = k + 1; k2->name[0] != '#'; ++k2)
continue;
nms = k2 - k - 1;
mod = xrealloc(mod, (++nmod + 1) * sizeof(*mod));
mod[nmod].name = k->name + 1;
mod[nmod].addr = k->value;
mod[nmod].used = 0;
mod[nmod].nsyms = nms;
mod[nmod].syms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL);
for (i = 0, ++k; i < nms; ++i, ++s, ++k) {
s->name = (unsigned long) k->name;
s->value = k->value;
}
k = k2;
}
ext_modules = mod;
n_ext_modules = nmod + 1;
/* Now collect the symbols for the kernel proper. */
if (k->name[0] == '#')
++k;
nksyms = nms = nks - (k - ks);
ksyms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL);
for (i = 0; i < nms; ++i, ++s, ++k) {
s->name = (unsigned long) k->name;
s->value = k->value;
}
return 1;
}
/* Return the kernel symbol checksum version, or zero if not used. */
static int old_is_kernel_checksummed(void)
{
/* Using_Versions is the first symbol. */
if (nksyms > 0
&& strcmp((char *) ksyms[0].name,
"Using_Versions") == 0) return ksyms[0].value;
else
return 0;
}
static int old_create_mod_use_count(struct obj_file *f)
{
struct obj_section *sec;
sec = obj_create_alloced_section_first(f, ".moduse", sizeof(long),
sizeof(long));
obj_add_symbol(f, "mod_use_count_", -1,
ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0,
sizeof(long));
return 1;
}
static int
old_init_module(const char *m_name, struct obj_file *f,
unsigned long m_size)
{
char *image;
struct old_mod_routines routines;
struct old_symbol_table *symtab;
int ret;
/* Create the symbol table */
{
int nsyms = 0, strsize = 0, total;
/* Size things first... */
if (flag_export) {
int i;
for (i = 0; i < HASH_BUCKETS; ++i) {
struct obj_symbol *sym;
for (sym = f->symtab[i]; sym; sym = sym->next)
if (ELFW(ST_BIND) (sym->info) != STB_LOCAL
&& sym->secidx <= SHN_HIRESERVE)
{
sym->ksymidx = nsyms++;
strsize += strlen(sym->name) + 1;
}
}
}
total = (sizeof(struct old_symbol_table)
+ nsyms * sizeof(struct old_module_symbol)
+ n_ext_modules_used * sizeof(struct old_module_ref)
+ strsize);
symtab = xmalloc(total);
symtab->size = total;
symtab->n_symbols = nsyms;
symtab->n_refs = n_ext_modules_used;
if (flag_export && nsyms) {
struct old_module_symbol *ksym;
char *str;
int i;
ksym = symtab->symbol;
str = ((char *) ksym + nsyms * sizeof(struct old_module_symbol)
+ n_ext_modules_used * sizeof(struct old_module_ref));
for (i = 0; i < HASH_BUCKETS; ++i) {
struct obj_symbol *sym;
for (sym = f->symtab[i]; sym; sym = sym->next)
if (sym->ksymidx >= 0) {
ksym->addr = obj_symbol_final_value(f, sym);
ksym->name =
(unsigned long) str - (unsigned long) symtab;
str = stpcpy(str, sym->name) + 1;
ksym++;
}
}
}
if (n_ext_modules_used) {
struct old_module_ref *ref;
int i;
ref = (struct old_module_ref *)
((char *) symtab->symbol + nsyms * sizeof(struct old_module_symbol));
for (i = 0; i < n_ext_modules; ++i)
if (ext_modules[i].used)
ref++->module = ext_modules[i].addr;
}
}
/* Fill in routines. */
routines.init =
obj_symbol_final_value(f, obj_find_symbol(f, "init_module"));
routines.cleanup =
obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module"));
/* Whew! All of the initialization is complete. Collect the final
module image and give it to the kernel. */
image = xmalloc(m_size);
obj_create_image(f, image);
/* image holds the complete relocated module, accounting correctly for
mod_use_count. However the old module kernel support assume that
it is receiving something which does not contain mod_use_count. */
ret = old_sys_init_module(m_name, image + sizeof(long),
m_size | (flag_autoclean ? OLD_MOD_AUTOCLEAN
: 0), &routines, symtab);
if (ret)
perror("init_module: %m");
free(image);
free(symtab);
return ret == 0;
}
#else
#define old_create_mod_use_count(x) TRUE
#define old_init_module(x, y, z) TRUE
#endif /* BB_FEATURE_INSMOD_OLD_KERNEL */
/*======================================================================*/
/* Functions relating to module loading after 2.1.18. */
static int
new_process_module_arguments(struct obj_file *f, int argc, char **argv)
{
while (argc > 0) {
char *p, *q, *key;
struct obj_symbol *sym;
char *contents, *loc;
int min, max, n;
p = *argv;
if ((q = strchr(p, '=')) == NULL)
continue;
key = alloca(q - p + 6);
memcpy(key, "parm_", 5);
memcpy(key + 5, p, q - p);
key[q - p + 5] = 0;
p = get_modinfo_value(f, key);
key += 5;
if (p == NULL) {
fprintf(stderr, "invalid parameter %s\n", key);
return 0;
}
sym = obj_find_symbol(f, key);
/* Also check that the parameter was not resolved from the kernel. */
if (sym == NULL || sym->secidx > SHN_HIRESERVE) {
fprintf(stderr, "symbol for parameter %s not found\n", key);
return 0;
}
if (isdigit(*p)) {
min = strtoul(p, &p, 10);
if (*p == '-')
max = strtoul(p + 1, &p, 10);
else
max = min;
} else
min = max = 1;
contents = f->sections[sym->secidx]->contents;
loc = contents + sym->value;
n = (*++q != '\0');
while (1) {
if ((*p == 's') || (*p == 'c')) {
char *str;
/* Do C quoting if we begin with a ", else slurp the lot. */
if (*q == '"') {
char *r;
str = alloca(strlen(q));
for (r = str, q++; *q != '"'; ++q, ++r) {
if (*q == '\0') {
fprintf(stderr,
"improperly terminated string argument for %s\n",
key);
return 0;
} else if (*q == '\\')
switch (*++q) {
case 'a':
*r = '\a';
break;
case 'b':
*r = '\b';
break;
case 'e':
*r = '\033';
break;
case 'f':
*r = '\f';
break;
case 'n':
*r = '\n';
break;
case 'r':
*r = '\r';
break;
case 't':
*r = '\t';
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
{
int c = *q - '0';
if (q[1] >= '0' && q[1] <= '7') {
c = (c * 8) + *++q - '0';
if (q[1] >= '0' && q[1] <= '7')
c = (c * 8) + *++q - '0';
}
*r = c;
}
break;
default:
*r = *q;
break;
} else
*r = *q;
}
*r = '\0';
++q;
} else {
char *r;
/* In this case, the string is not quoted. We will break
it using the coma (like for ints). If the user wants to
include comas in a string, he just has to quote it */
/* Search the next coma */
r = strchr(q, ',');
/* Found ? */
if (r != (char *) NULL) {
/* Recopy the current field */
str = alloca(r - q + 1);
memcpy(str, q, r - q);
/* I don't know if it is usefull, as the previous case
doesn't null terminate the string ??? */
str[r - q] = '\0';
/* Keep next fields */
q = r;
} else {
/* last string */
str = q;
q = "";
}
}
if (*p == 's') {
/* Normal string */
obj_string_patch(f, sym->secidx, loc - contents, str);
loc += tgt_sizeof_char_p;
} else {
/* Array of chars (in fact, matrix !) */
long charssize; /* size of each member */
/* Get the size of each member */
/* Probably we should do that outside the loop ? */
if (!isdigit(*(p + 1))) {
fprintf(stderr,
"parameter type 'c' for %s must be followed by"
" the maximum size\n", key);
return 0;
}
charssize = strtoul(p + 1, (char **) NULL, 10);
/* Check length */
if (strlen(str) >= charssize) {
fprintf(stderr,
"string too long for %s (max %ld)\n", key,
charssize - 1);
return 0;
}
/* Copy to location */
strcpy((char *) loc, str);
loc += charssize;
}
} else {
long v = strtoul(q, &q, 0);
switch (*p) {
case 'b':
*loc++ = v;
break;
case 'h':
*(short *) loc = v;
loc += tgt_sizeof_short;
break;
case 'i':
*(int *) loc = v;
loc += tgt_sizeof_int;
break;
case 'l':
*(long *) loc = v;
loc += tgt_sizeof_long;
break;
default:
fprintf(stderr, "unknown parameter type '%c' for %s\n",
*p, key);
return 0;
}
}
retry_end_of_value:
switch (*q) {
case '\0':
goto end_of_arg;
case ' ':
case '\t':
case '\n':
case '\r':
++q;
goto retry_end_of_value;
case ',':
if (++n > max) {
fprintf(stderr, "too many values for %s (max %d)\n",
key, max);
return 0;
}
++q;
break;
default:
fprintf(stderr, "invalid argument syntax for %s\n", key);
return 0;
}
}
end_of_arg:
if (n < min) {
fprintf(stderr, "too few values for %s (min %d)\n", key, min);
return 0;
}
argc--, argv++;
}
return 1;
}
#ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
static int new_is_module_checksummed(struct obj_file *f)
{
const char *p = get_modinfo_value(f, "using_checksums");
if (p)
return atoi(p);
else
return 0;
}
/* Get the module's kernel version in the canonical integer form. */
static int
new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
{
char *p, *q;
int a, b, c;
p = get_modinfo_value(f, "kernel_version");
if (p == NULL)
return -1;
strncpy(str, p, STRVERSIONLEN);
a = strtoul(p, &p, 10);
if (*p != '.')
return -1;
b = strtoul(p + 1, &p, 10);
if (*p != '.')
return -1;
c = strtoul(p + 1, &q, 10);
if (p + 1 == q)
return -1;
return a << 16 | b << 8 | c;
}
#endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
#ifdef BB_FEATURE_INSMOD_NEW_KERNEL
/* Fetch the loaded modules, and all currently exported symbols. */
static int new_get_kernel_symbols(void)
{
char *module_names, *mn;
struct external_module *modules, *m;
struct new_module_symbol *syms, *s;
size_t ret, bufsize, nmod, nsyms, i, j;
/* Collect the loaded modules. */
module_names = xmalloc(bufsize = 256);
retry_modules_load:
if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) {
if (errno == ENOSPC) {
module_names = xrealloc(module_names, bufsize = ret);
goto retry_modules_load;
}
perror("QM_MODULES: %m\n");
return 0;
}
n_ext_modules = nmod = ret;
ext_modules = modules = xmalloc(nmod * sizeof(*modules));
memset(modules, 0, nmod * sizeof(*modules));
/* Collect the modules' symbols. */
for (i = 0, mn = module_names, m = modules;
i < nmod; ++i, ++m, mn += strlen(mn) + 1) {
struct new_module_info info;
if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) {
if (errno == ENOENT) {
/* The module was removed out from underneath us. */
continue;
}
perror("query_module: QM_INFO: %m");
return 0;
}
syms = xmalloc(bufsize = 1024);
retry_mod_sym_load:
if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) {
switch (errno) {
case ENOSPC:
syms = xrealloc(syms, bufsize = ret);
goto retry_mod_sym_load;
case ENOENT:
/* The module was removed out from underneath us. */
continue;
default:
perror("query_module: QM_SYMBOLS: %m");
return 0;
}
}
nsyms = ret;
m->name = mn;
m->addr = info.addr;
m->nsyms = nsyms;
m->syms = syms;
for (j = 0, s = syms; j < nsyms; ++j, ++s) {
s->name += (unsigned long) syms;
}
}
/* Collect the kernel's symbols. */
syms = xmalloc(bufsize = 16 * 1024);
retry_kern_sym_load:
if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) {
if (errno == ENOSPC) {
syms = xrealloc(syms, bufsize = ret);
goto retry_kern_sym_load;
}
perror("kernel: QM_SYMBOLS: %m");
return 0;
}
nksyms = nsyms = ret;
ksyms = syms;
for (j = 0, s = syms; j < nsyms; ++j, ++s) {
s->name += (unsigned long) syms;
}
return 1;
}
/* Return the kernel symbol checksum version, or zero if not used. */
static int new_is_kernel_checksummed(void)
{
struct new_module_symbol *s;
size_t i;
/* Using_Versions is not the first symbol, but it should be in there. */
for (i = 0, s = ksyms; i < nksyms; ++i, ++s)
if (strcmp((char *) s->name, "Using_Versions") == 0)
return s->value;
return 0;
}
static int new_create_this_module(struct obj_file *f, const char *m_name)
{
struct obj_section *sec;
sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long,
sizeof(struct new_module));
memset(sec->contents, 0, sizeof(struct new_module));
obj_add_symbol(f, "__this_module", -1,
ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0,
sizeof(struct new_module));
obj_string_patch(f, sec->idx, offsetof(struct new_module, name),
m_name);
return 1;
}
static int new_create_module_ksymtab(struct obj_file *f)
{
struct obj_section *sec;
int i;
/* We must always add the module references. */
if (n_ext_modules_used) {
struct new_module_ref *dep;
struct obj_symbol *tm;
sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p,
(sizeof(struct new_module_ref)
* n_ext_modules_used));
if (!sec)
return 0;
tm = obj_find_symbol(f, "__this_module");
dep = (struct new_module_ref *) sec->contents;
for (i = 0; i < n_ext_modules; ++i)
if (ext_modules[i].used) {
dep->dep = ext_modules[i].addr;
obj_symbol_patch(f, sec->idx,
(char *) &dep->ref - sec->contents, tm);
dep->next_ref = 0;
++dep;
}
}
if (flag_export && !obj_find_section(f, "__ksymtab")) {
size_t nsyms;
int *loaded;
sec =
obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p,
0);
/* We don't want to export symbols residing in sections that
aren't loaded. There are a number of these created so that
we make sure certain module options don't appear twice. */
loaded = alloca(sizeof(int) * (i = f->header.e_shnum));
while (--i >= 0)
loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0;
for (nsyms = i = 0; i < HASH_BUCKETS; ++i) {
struct obj_symbol *sym;
for (sym = f->symtab[i]; sym; sym = sym->next)
if (ELFW(ST_BIND) (sym->info) != STB_LOCAL
&& sym->secidx <= SHN_HIRESERVE
&& (sym->secidx >= SHN_LORESERVE
|| loaded[sym->secidx])) {
ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p;
obj_symbol_patch(f, sec->idx, ofs, sym);
obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p,
sym->name);
nsyms++;
}
}
obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p);
}
return 1;
}
static int
new_init_module(const char *m_name, struct obj_file *f,
unsigned long m_size)
{
struct new_module *module;
struct obj_section *sec;
void *image;
int ret;
tgt_long m_addr;
sec = obj_find_section(f, ".this");
module = (struct new_module *) sec->contents;
m_addr = sec->header.sh_addr;
module->size_of_struct = sizeof(*module);
module->size = m_size;
module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0;
sec = obj_find_section(f, "__ksymtab");
if (sec && sec->header.sh_size) {
module->syms = sec->header.sh_addr;
module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p);
}
if (n_ext_modules_used) {
sec = obj_find_section(f, ".kmodtab");
module->deps = sec->header.sh_addr;
module->ndeps = n_ext_modules_used;
}
module->init =
obj_symbol_final_value(f, obj_find_symbol(f, "init_module"));
module->cleanup =
obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module"));
sec = obj_find_section(f, "__ex_table");
if (sec) {
module->ex_table_start = sec->header.sh_addr;
module->ex_table_end = sec->header.sh_addr + sec->header.sh_size;
}
sec = obj_find_section(f, ".text.init");
if (sec) {
module->runsize = sec->header.sh_addr - m_addr;
}
sec = obj_find_section(f, ".data.init");
if (sec) {
if (!module->runsize ||
module->runsize > sec->header.sh_addr - m_addr)
module->runsize = sec->header.sh_addr - m_addr;
}
if (!arch_init_module(f, module))
return 0;
/* Whew! All of the initialization is complete. Collect the final
module image and give it to the kernel. */
image = xmalloc(m_size);
obj_create_image(f, image);
ret = new_sys_init_module(m_name, (struct new_module *) image);
if (ret)
perror("init_module: %m");
free(image);
return ret == 0;
}
#else
#define new_init_module(x, y, z) TRUE
#define new_create_this_module(x, y) 0
#define new_create_module_ksymtab(x)
#endif /* BB_FEATURE_INSMOD_OLD_KERNEL */
/*======================================================================*/
int
obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
const char *string)
{
struct obj_string_patch *p;
struct obj_section *strsec;
size_t len = strlen(string) + 1;
char *loc;
p = xmalloc(sizeof(*p));
p->next = f->string_patches;
p->reloc_secidx = secidx;
p->reloc_offset = offset;
f->string_patches = p;
strsec = obj_find_section(f, ".kstrtab");
if (strsec == NULL) {
strsec = obj_create_alloced_section(f, ".kstrtab", 1, len);
p->string_offset = 0;
loc = strsec->contents;
} else {
p->string_offset = strsec->header.sh_size;
loc = obj_extend_section(strsec, len);
}
memcpy(loc, string, len);
return 1;
}
int
obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
struct obj_symbol *sym)
{
struct obj_symbol_patch *p;
p = xmalloc(sizeof(*p));
p->next = f->symbol_patches;
p->reloc_secidx = secidx;
p->reloc_offset = offset;
p->sym = sym;
f->symbol_patches = p;
return 1;
}
int obj_check_undefineds(struct obj_file *f)
{
unsigned long i;
int ret = 1;
for (i = 0; i < HASH_BUCKETS; ++i) {
struct obj_symbol *sym;
for (sym = f->symtab[i]; sym; sym = sym->next)
if (sym->secidx == SHN_UNDEF) {
if (ELFW(ST_BIND) (sym->info) == STB_WEAK) {
sym->secidx = SHN_ABS;
sym->value = 0;
} else {
fprintf(stderr, "unresolved symbol %s\n", sym->name);
ret = 0;
}
}
}
return ret;
}
void obj_allocate_commons(struct obj_file *f)
{
struct common_entry {
struct common_entry *next;
struct obj_symbol *sym;
} *common_head = NULL;
unsigned long i;
for (i = 0; i < HASH_BUCKETS; ++i) {
struct obj_symbol *sym;
for (sym = f->symtab[i]; sym; sym = sym->next)
if (sym->secidx == SHN_COMMON) {
/* Collect all COMMON symbols and sort them by size so as to
minimize space wasted by alignment requirements. */
{
struct common_entry **p, *n;
for (p = &common_head; *p; p = &(*p)->next)
if (sym->size <= (*p)->sym->size)
break;
n = alloca(sizeof(*n));
n->next = *p;
n->sym = sym;
*p = n;
}
}
}
for (i = 1; i < f->local_symtab_size; ++i) {
struct obj_symbol *sym = f->local_symtab[i];
if (sym && sym->secidx == SHN_COMMON) {
struct common_entry **p, *n;
for (p = &common_head; *p; p = &(*p)->next)
if (sym == (*p)->sym)
break;
else if (sym->size < (*p)->sym->size) {
n = alloca(sizeof(*n));
n->next = *p;
n->sym = sym;
*p = n;
break;
}
}
}
if (common_head) {
/* Find the bss section. */
for (i = 0; i < f->header.e_shnum; ++i)
if (f->sections[i]->header.sh_type == SHT_NOBITS)
break;
/* If for some reason there hadn't been one, create one. */
if (i == f->header.e_shnum) {
struct obj_section *sec;
f->sections = xrealloc(f->sections, (i + 1) * sizeof(sec));
f->sections[i] = sec = arch_new_section();
f->header.e_shnum = i + 1;
memset(sec, 0, sizeof(*sec));
sec->header.sh_type = SHT_PROGBITS;
sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
sec->name = ".bss";
sec->idx = i;
}
/* Allocate the COMMONS. */
{
ElfW(Addr) bss_size = f->sections[i]->header.sh_size;
ElfW(Addr) max_align = f->sections[i]->header.sh_addralign;
struct common_entry *c;
for (c = common_head; c; c = c->next) {
ElfW(Addr) align = c->sym->value;
if (align > max_align)
max_align = align;
if (bss_size & (align - 1))
bss_size = (bss_size | (align - 1)) + 1;
c->sym->secidx = i;
c->sym->value = bss_size;
bss_size += c->sym->size;
}
f->sections[i]->header.sh_size = bss_size;
f->sections[i]->header.sh_addralign = max_align;
}
}
/* For the sake of patch relocation and parameter initialization,
allocate zeroed data for NOBITS sections now. Note that after
this we cannot assume NOBITS are really empty. */
for (i = 0; i < f->header.e_shnum; ++i) {
struct obj_section *s = f->sections[i];
if (s->header.sh_type == SHT_NOBITS) {
s->contents = memset(xmalloc(s->header.sh_size),
0, s->header.sh_size);
s->header.sh_type = SHT_PROGBITS;
}
}
}
unsigned long obj_load_size(struct obj_file *f)
{
unsigned long dot = 0;
struct obj_section *sec;
/* Finalize the positions of the sections relative to one another. */
for (sec = f->load_order; sec; sec = sec->load_next) {
ElfW(Addr) align;
align = sec->header.sh_addralign;
if (align && (dot & (align - 1)))
dot = (dot | (align - 1)) + 1;
sec->header.sh_addr = dot;
dot += sec->header.sh_size;
}
return dot;
}
int obj_relocate(struct obj_file *f, ElfW(Addr) base)
{
int i, n = f->header.e_shnum;
int ret = 1;
/* Finalize the addresses of the sections. */
f->baseaddr = base;
for (i = 0; i < n; ++i)
f->sections[i]->header.sh_addr += base;
/* And iterate over all of the relocations. */
for (i = 0; i < n; ++i) {
struct obj_section *relsec, *symsec, *targsec, *strsec;
ElfW(RelM) * rel, *relend;
ElfW(Sym) * symtab;
const char *strtab;
relsec = f->sections[i];
if (relsec->header.sh_type != SHT_RELM)
continue;
symsec = f->sections[relsec->header.sh_link];
targsec = f->sections[relsec->header.sh_info];
strsec = f->sections[symsec->header.sh_link];
rel = (ElfW(RelM) *) relsec->contents;
relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
symtab = (ElfW(Sym) *) symsec->contents;
strtab = (const char *) strsec->contents;
for (; rel < relend; ++rel) {
ElfW(Addr) value = 0;
struct obj_symbol *intsym = NULL;
unsigned long symndx;
ElfW(Sym) * extsym = 0;
const char *errmsg;
/* Attempt to find a value to use for this relocation. */
symndx = ELFW(R_SYM) (rel->r_info);
if (symndx) {
/* Note we've already checked for undefined symbols. */
extsym = &symtab[symndx];
if (ELFW(ST_BIND) (extsym->st_info) == STB_LOCAL) {
/* Local symbols we look up in the local table to be sure
we get the one that is really intended. */
intsym = f->local_symtab[symndx];
} else {
/* Others we look up in the hash table. */
const char *name;
if (extsym->st_name)
name = strtab + extsym->st_name;
else
name = f->sections[extsym->st_shndx]->name;
intsym = obj_find_symbol(f, name);
}
value = obj_symbol_final_value(f, intsym);
intsym->referenced = 1;
}
#if SHT_RELM == SHT_RELA
#if defined(__alpha__) && defined(AXP_BROKEN_GAS)
/* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */
if (!extsym || !extsym->st_name ||
ELFW(ST_BIND) (extsym->st_info) != STB_LOCAL)
#endif
value += rel->r_addend;
#endif
/* Do it! */
switch (arch_apply_relocation
(f, targsec, symsec, intsym, rel, value)) {
case obj_reloc_ok:
break;
case obj_reloc_overflow:
errmsg = "Relocation overflow";
goto bad_reloc;
case obj_reloc_dangerous:
errmsg = "Dangerous relocation";
goto bad_reloc;
case obj_reloc_unhandled:
errmsg = "Unhandled relocation";
bad_reloc:
if (extsym) {
fprintf(stderr, "%s of type %ld for %s\n", errmsg,
(long) ELFW(R_TYPE) (rel->r_info),
strtab + extsym->st_name);
} else {
fprintf(stderr, "%s of type %ld\n", errmsg,
(long) ELFW(R_TYPE) (rel->r_info));
}
ret = 0;
break;
}
}
}
/* Finally, take care of the patches. */
if (f->string_patches) {
struct obj_string_patch *p;
struct obj_section *strsec;
ElfW(Addr) strsec_base;
strsec = obj_find_section(f, ".kstrtab");
strsec_base = strsec->header.sh_addr;
for (p = f->string_patches; p; p = p->next) {
struct obj_section *targsec = f->sections[p->reloc_secidx];
*(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
= strsec_base + p->string_offset;
}
}
if (f->symbol_patches) {
struct obj_symbol_patch *p;
for (p = f->symbol_patches; p; p = p->next) {
struct obj_section *targsec = f->sections[p->reloc_secidx];
*(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
= obj_symbol_final_value(f, p->sym);
}
}
return ret;
}
int obj_create_image(struct obj_file *f, char *image)
{
struct obj_section *sec;
ElfW(Addr) base = f->baseaddr;
for (sec = f->load_order; sec; sec = sec->load_next) {
char *secimg;
if (sec->header.sh_size == 0)
continue;
secimg = image + (sec->header.sh_addr - base);
/* Note that we allocated data for NOBITS sections earlier. */
memcpy(secimg, sec->contents, sec->header.sh_size);
}
return 1;
}
/*======================================================================*/
struct obj_file *obj_load(FILE * fp)
{
struct obj_file *f;
ElfW(Shdr) * section_headers;
int shnum, i;
char *shstrtab;
/* Read the file header. */
f = arch_new_file();
memset(f, 0, sizeof(*f));
f->symbol_cmp = strcmp;
f->symbol_hash = obj_elf_hash;
f->load_order_search_start = &f->load_order;
fseek(fp, 0, SEEK_SET);
if (fread(&f->header, sizeof(f->header), 1, fp) != 1) {
perror("error reading ELF header: %m");
return NULL;
}
if (f->header.e_ident[EI_MAG0] != ELFMAG0
|| f->header.e_ident[EI_MAG1] != ELFMAG1
|| f->header.e_ident[EI_MAG2] != ELFMAG2
|| f->header.e_ident[EI_MAG3] != ELFMAG3) {
fprintf(stderr, "not an ELF file\n");
return NULL;
}
if (f->header.e_ident[EI_CLASS] != ELFCLASSM
|| f->header.e_ident[EI_DATA] != ELFDATAM
|| f->header.e_ident[EI_VERSION] != EV_CURRENT
|| !MATCH_MACHINE(f->header.e_machine)) {
fprintf(stderr, "ELF file not for this architecture\n");
return NULL;
}
if (f->header.e_type != ET_REL) {
fprintf(stderr, "ELF file not a relocatable object\n");
return NULL;
}
/* Read the section headers. */
if (f->header.e_shentsize != sizeof(ElfW(Shdr))) {
fprintf(stderr, "section header size mismatch: %lu != %lu\n",
(unsigned long) f->header.e_shentsize,
(unsigned long) sizeof(ElfW(Shdr)));
return NULL;
}
shnum = f->header.e_shnum;
f->sections = xmalloc(sizeof(struct obj_section *) * shnum);
memset(f->sections, 0, sizeof(struct obj_section *) * shnum);
section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
fseek(fp, f->header.e_shoff, SEEK_SET);
if (fread(section_headers, sizeof(ElfW(Shdr)), shnum, fp) != shnum) {
perror("error reading ELF section headers: %m");
return NULL;
}
/* Read the section data. */
for (i = 0; i < shnum; ++i) {
struct obj_section *sec;
f->sections[i] = sec = arch_new_section();
memset(sec, 0, sizeof(*sec));
sec->header = section_headers[i];
sec->idx = i;
switch (sec->header.sh_type) {
case SHT_NULL:
case SHT_NOTE:
case SHT_NOBITS:
/* ignore */
break;
case SHT_PROGBITS:
case SHT_SYMTAB:
case SHT_STRTAB:
case SHT_RELM:
if (sec->header.sh_size > 0) {
sec->contents = xmalloc(sec->header.sh_size);
fseek(fp, sec->header.sh_offset, SEEK_SET);
if (fread(sec->contents, sec->header.sh_size, 1, fp) != 1) {
fprintf(stderr,
"error reading ELF section data: %m\n");
return NULL;
}
} else {
sec->contents = NULL;
}
break;
#if SHT_RELM == SHT_REL
case SHT_RELA:
fprintf(stderr,
"RELA relocations not supported on this architecture\n");
return NULL;
#else
case SHT_REL:
fprintf(stderr,
"REL relocations not supported on this architecture\n");
return NULL;
#endif
default:
if (sec->header.sh_type >= SHT_LOPROC) {
/* Assume processor specific section types are debug
info and can safely be ignored. If this is ever not
the case (Hello MIPS?), don't put ifdefs here but
create an arch_load_proc_section(). */
break;
}
fprintf(stderr, "can't handle sections of type %ld\n",
(long) sec->header.sh_type);
return NULL;
}
}
/* Do what sort of interpretation as needed by each section. */
shstrtab = f->sections[f->header.e_shstrndx]->contents;
for (i = 0; i < shnum; ++i) {
struct obj_section *sec = f->sections[i];
sec->name = shstrtab + sec->header.sh_name;
}
for (i = 0; i < shnum; ++i) {
struct obj_section *sec = f->sections[i];
if (sec->header.sh_flags & SHF_ALLOC)
obj_insert_section_load_order(f, sec);
switch (sec->header.sh_type) {
case SHT_SYMTAB:
{
unsigned long nsym, j;
char *strtab;
ElfW(Sym) * sym;
if (sec->header.sh_entsize != sizeof(ElfW(Sym))) {
fprintf(stderr, "symbol size mismatch: %lu != %lu\n",
(unsigned long) sec->header.sh_entsize,
(unsigned long) sizeof(ElfW(Sym)));
return NULL;
}
nsym = sec->header.sh_size / sizeof(ElfW(Sym));
strtab = f->sections[sec->header.sh_link]->contents;
sym = (ElfW(Sym) *) sec->contents;
/* Allocate space for a table of local symbols. */
j = f->local_symtab_size = sec->header.sh_info;
f->local_symtab = xmalloc(j *=
sizeof(struct obj_symbol *));
memset(f->local_symtab, 0, j);
/* Insert all symbols into the hash table. */
for (j = 1, ++sym; j < nsym; ++j, ++sym) {
const char *name;
if (sym->st_name)
name = strtab + sym->st_name;
else
name = f->sections[sym->st_shndx]->name;
obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx,
sym->st_value, sym->st_size);
}
}
break;
case SHT_RELM:
if (sec->header.sh_entsize != sizeof(ElfW(RelM))) {
fprintf(stderr,
"relocation entry size mismatch: %lu != %lu\n",
(unsigned long) sec->header.sh_entsize,
(unsigned long) sizeof(ElfW(RelM)));
return NULL;
}
break;
}
}
return f;
}
static void hide_special_symbols(struct obj_file *f)
{
static const char *const specials[] = {
"cleanup_module",
"init_module",
"kernel_version",
NULL
};
struct obj_symbol *sym;
const char *const *p;
for (p = specials; *p; ++p)
if ((sym = obj_find_symbol(f, *p)) != NULL)
sym->info =
ELFW(ST_INFO) (STB_LOCAL, ELFW(ST_TYPE) (sym->info));
}
extern int insmod_main( int argc, char **argv)
{
int k_crcs;
int k_new_syscalls;
int len;
char *tmp;
unsigned long m_size;
ElfW(Addr) m_addr;
FILE *fp;
struct obj_file *f;
char m_name[BUFSIZ + 1] = "\0";
int exit_status = FALSE;
int m_has_modinfo;
#ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
int k_version;
char k_strversion[STRVERSIONLEN];
char m_strversion[STRVERSIONLEN];
int m_version;
int m_crcs;
#endif
if (argc <= 1) {
usage(insmod_usage);
}
/* Parse any options */
while (--argc > 0 && **(++argv) == '-') {
while (*(++(*argv))) {
switch (**argv) {
case 'f': /* force loading */
flag_force_load = 1;
break;
case 'k': /* module loaded by kerneld, auto-cleanable */
flag_autoclean = 1;
break;
case 'v': /* verbose output */
flag_verbose = 1;
break;
case 'x': /* do not export externs */
flag_export = 0;
break;
default:
usage(insmod_usage);
}
}
}
if (argc <= 0) {
usage(insmod_usage);
}
/* Grab the module name */
if ((tmp = strrchr(*argv, '/')) != NULL) {
tmp++;
} else {
tmp = *argv;
}
len = strlen(tmp);
if (len > 2 && tmp[len - 2] == '.' && tmp[len - 1] == 'o')
len -= 2;
memcpy(m_name, tmp, len);
strcpy(m_fullName, m_name);
strcat(m_fullName, ".o");
/* Get a filedesc for the module */
if ((fp = fopen(*argv, "r")) == NULL) {
/* Hmpf. Could not open it. Search through _PATH_MODULES to find a module named m_name */
if (recursiveAction(_PATH_MODULES, TRUE, FALSE, FALSE,
findNamedModule, 0, m_fullName) == TRUE)
{
if (m_filename[0] == '\0'
|| ((fp = fopen(m_filename, "r")) == NULL))
{
perror("No module by that name found in " _PATH_MODULES
"\n");
exit(FALSE);
}
}
} else
memcpy(m_filename, *argv, strlen(*argv));
if ((f = obj_load(fp)) == NULL) {
perror("Could not load the module\n");
exit(FALSE);
}
if (get_modinfo_value(f, "kernel_version") == NULL)
m_has_modinfo = 0;
else
m_has_modinfo = 1;
#ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
/* Version correspondence? */
k_version = get_kernel_version(k_strversion);
if (m_has_modinfo) {
m_version = new_get_module_version(f, m_strversion);
} else {
m_version = old_get_module_version(f, m_strversion);
if (m_version == -1) {
fprintf(stderr,
"couldn't find the kernel version the module was compiled for\n");
goto out;
}
}
if (strncmp(k_strversion, m_strversion, STRVERSIONLEN) != 0) {
if (flag_force_load) {
fprintf(stderr, "Warning: kernel-module version mismatch\n"
"\t%s was compiled for kernel version %s\n"
"\twhile this kernel is version %s\n",
m_filename, m_strversion, k_strversion);
} else {
fprintf(stderr, "kernel-module version mismatch\n"
"\t%s was compiled for kernel version %s\n"
"\twhile this kernel is version %s.\n",
m_filename, m_strversion, k_strversion);
goto out;
}
}
k_crcs = 0;
#endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
k_new_syscalls = !query_module(NULL, 0, NULL, 0, NULL);
if (k_new_syscalls) {
#ifdef BB_FEATURE_INSMOD_NEW_KERNEL
if (!new_get_kernel_symbols())
goto out;
k_crcs = new_is_kernel_checksummed();
#else
fprintf(stderr, "Not configured to support new kernels\n");
goto out;
#endif
} else {
#ifdef BB_FEATURE_INSMOD_OLD_KERNEL
if (!old_get_kernel_symbols())
goto out;
k_crcs = old_is_kernel_checksummed();
#else
fprintf(stderr, "Not configured to support old kernels\n");
goto out;
#endif
}
#ifdef BB_FEATURE_INSMOD_VERSION_CHECKING
if (m_has_modinfo)
m_crcs = new_is_module_checksummed(f);
else
m_crcs = old_is_module_checksummed(f);
if (m_crcs != k_crcs)
obj_set_symbol_compare(f, ncv_strcmp, ncv_symbol_hash);
#endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */
/* Let the module know about the kernel symbols. */
add_kernel_symbols(f);
/* Allocate common symbols, symbol tables, and string tables. */
if (k_new_syscalls
? !new_create_this_module(f, m_name)
: !old_create_mod_use_count(f))
{
goto out;
}
if (!obj_check_undefineds(f)) {
goto out;
}
obj_allocate_commons(f);
if (optind < argc) {
if (m_has_modinfo
? !new_process_module_arguments(f, argc - optind, argv + optind)
: !old_process_module_arguments(f, argc - optind, argv + optind))
{
goto out;
}
}
arch_create_got(f);
hide_special_symbols(f);
if (k_new_syscalls)
new_create_module_ksymtab(f);
/* Find current size of the module */
m_size = obj_load_size(f);
errno = 0;
m_addr = create_module(m_name, m_size);
switch (errno) {
case 0:
break;
case EEXIST:
fprintf(stderr, "A module named %s already exists\n", m_name);
goto out;
case ENOMEM:
fprintf(stderr,
"Can't allocate kernel memory for module; needed %lu bytes\n",
m_size);
goto out;
default:
perror("create_module: %m");
goto out;
}
if (!obj_relocate(f, m_addr)) {
delete_module(m_name);
goto out;
}
if (k_new_syscalls
? !new_init_module(m_name, f, m_size)
: !old_init_module(m_name, f, m_size))
{
delete_module(m_name);
goto out;
}
exit_status = TRUE;
out:
fclose(fp);
return(exit_status);
}
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