insmod.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

/* vi: set sw=4 ts=4: */
/*
 * Mini insmod implementation for busybox
 *
 * This version of insmod supports x86, ARM, SH3/4, powerpc, m68k, 
 * MIPS, and v850e.
 *
 * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
 * Copyright (C) 1999,2000,2001,2002 by Erik Andersen <[e-mail]>
 * and Ron Alder <[e-mail]>
 *
 * Miles Bader <[e-mail]> added NEC V850E support.
 *
 * Modified by Bryan Rittmeyer <[e-mail]> to support SH4
 * and (theoretically) SH3. I have only tested SH4 in little endian mode.
 *
 * Modified by Alcove, Julien Gaulmin <[e-mail]> and
 * Nicolas Ferre <[e-mail]> to support ARM7TDMI.  Only
 * very minor changes required to also work with StrongArm and presumably
 * all ARM based systems.
 *
 * Magnus Damm <[e-mail]> 22-May-2002.
 *   The plt and got code are now using the same structs.
 *   Added generic linked list code to fully support PowerPC.
 *   Replaced the mess in arch_apply_relocation() with architecture blocks.
 *   The arch_create_got() function got cleaned up with architecture blocks.
 *   These blocks should be easy maintain and sync with obj_xxx.c in modutils.
 *
 * Magnus Damm <[e-mail]> added PowerPC support 20-Feb-2001.
 *   PowerPC specific code stolen from modutils-2.3.16, 
 *   written by Paul Mackerras, Copyright 1996, 1997 Linux International.
 *   I've only tested the code on mpc8xx platforms in big-endian mode.
 *   Did some cleanup and added CONFIG_USE_xxx_ENTRIES...
 *
 * Quinn Jensen <[e-mail]> added MIPS support 23-Feb-2001.
 *   based on modutils-2.4.2
 *   MIPS specific support for Elf loading and relocation.
 *   Copyright 1996, 1997 Linux International.
 *   Contributed by Ralf Baechle <[e-mail]>
 *
 * Based almost entirely on the Linux modutils-2.3.11 implementation.
 *   Copyright 1996, 1997 Linux International.
 *   New implementation contributed by Richard Henderson <[e-mail]>
 *   Based on original work by Bjorn Ekwall <[e-mail]>
 *   Restructured (and partly rewritten) by:
 *   Bj鰎n Ekwall <[e-mail]> 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 <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>
#include <assert.h>
#include <string.h>
#include <getopt.h>
#include <sys/utsname.h>
#include "busybox.h"

#ifdef CONFIG_FEATURE_NEW_MODULE_INTERFACE
# undef CONFIG_FEATURE_OLD_MODULE_INTERFACE
# define new_sys_init_module	init_module
#else
# define old_sys_init_module	init_module
#endif

#ifdef CONFIG_FEATURE_INSMOD_LOADINKMEM
#define LOADBITS 0	
#else
#define LOADBITS 1
#endif


#if defined(__arm__)
#define CONFIG_USE_PLT_ENTRIES
#define CONFIG_PLT_ENTRY_SIZE 8
#define CONFIG_USE_GOT_ENTRIES
#define CONFIG_GOT_ENTRY_SIZE 8
#define CONFIG_USE_SINGLE

#define MATCH_MACHINE(x) (x == EM_ARM)
#define SHT_RELM	SHT_REL
#define Elf32_RelM	Elf32_Rel
#define ELFCLASSM	ELFCLASS32
#endif

#if defined(__i386__)
#define CONFIG_USE_GOT_ENTRIES
#define CONFIG_GOT_ENTRY_SIZE 4
#define CONFIG_USE_SINGLE

#ifndef EM_486
#define MATCH_MACHINE(x) (x == EM_386)
#else
#define MATCH_MACHINE(x) (x == EM_386 || x == EM_486)
#endif

#define SHT_RELM	SHT_REL
#define Elf32_RelM	Elf32_Rel
#define ELFCLASSM	ELFCLASS32
#endif

#if defined(__mc68000__) 
#define CONFIG_USE_GOT_ENTRIES
#define CONFIG_GOT_ENTRY_SIZE 4
#define CONFIG_USE_SINGLE

#define MATCH_MACHINE(x) (x == EM_68K)
#define SHT_RELM	SHT_RELA
#define Elf32_RelM	Elf32_Rela
#endif

#if defined(__mips__)
/* Account for ELF spec changes.  */
#ifndef EM_MIPS_RS3_LE
#ifdef EM_MIPS_RS4_BE
#define EM_MIPS_RS3_LE	EM_MIPS_RS4_BE
#else
#define EM_MIPS_RS3_LE	10
#endif
#endif /* !EM_MIPS_RS3_LE */

#define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE)
#define SHT_RELM	SHT_REL
#define Elf32_RelM	Elf32_Rel
#define ELFCLASSM	ELFCLASS32
#define ARCHDATAM       "__dbe_table"
#endif

#if defined(__powerpc__)
#define CONFIG_USE_PLT_ENTRIES
#define CONFIG_PLT_ENTRY_SIZE 16
#define CONFIG_USE_PLT_LIST
#define CONFIG_LIST_ARCHTYPE ElfW(Addr) 
#define CONFIG_USE_LIST

#define MATCH_MACHINE(x) (x == EM_PPC)
#define SHT_RELM	SHT_RELA
#define Elf32_RelM	Elf32_Rela
#define ELFCLASSM	ELFCLASS32
#define ARCHDATAM       "__ftr_fixup"
#endif

#if defined(__sh__)
#define CONFIG_USE_GOT_ENTRIES
#define CONFIG_GOT_ENTRY_SIZE 4
#define CONFIG_USE_SINGLE

#define MATCH_MACHINE(x) (x == EM_SH)
#define SHT_RELM	SHT_RELA
#define Elf32_RelM	Elf32_Rela
#define ELFCLASSM	ELFCLASS32

/* the SH changes have only been tested on the SH4 in =little endian= mode */
/* I'm not sure about big endian, so let's warn: */

#if (defined(__SH4__) || defined(__SH3__)) && defined(__BIG_ENDIAN__)
#error insmod.c may require changes for use on big endian SH4/SH3
#endif

/* it may or may not work on the SH1/SH2... So let's error on those
   also */
#if (defined(__sh__) && (!(defined(__SH3__) || defined(__SH4__))))
#error insmod.c may require changes for non-SH3/SH4 use
#endif
#endif

#if defined (__v850e__)
#define CONFIG_USE_PLT_ENTRIES
#define CONFIG_PLT_ENTRY_SIZE 8
#define CONFIG_USE_SINGLE

#ifndef EM_CYGNUS_V850	/* grumble */
#define EM_CYGNUS_V850 	0x9080
#endif

#define MATCH_MACHINE(x) ((x) == EM_V850 || (x) == EM_CYGNUS_V850)
#define SHT_RELM	SHT_RELA
#define Elf32_RelM	Elf32_Rela
#define ELFCLASSM	ELFCLASS32

#define SYMBOL_PREFIX	"_"
#endif

#ifndef SHT_RELM
#error Sorry, but insmod.c does not yet support this architecture...
#endif


//----------------------------------------------------------------------------
//--------modutils module.h, lines 45-242
//----------------------------------------------------------------------------

/* Definitions for the Linux module syscall interface.
   Copyright 1996, 1997 Linux International.

   Contributed by Richard Henderson <[e-mail]>

   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
static const int MODUTILS_MODULE_H = 1;

#ident "$Id: insmod.c,v 1.87 2002/07/02 19:14:23 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.  */
static const int 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
static const int tgt_sizeof_long = 8;
static const int tgt_sizeof_char_p = 8;
static const int 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;
#ifdef CONFIG_FEATURE_NEW_MODULE_INTERFACE
  const char *kallsyms_start;     /* All symbols for kernel debugging */
  const char *kallsyms_end;
  const char *archdata_start;     /* arch specific data for module */
  const char *archdata_end;
  const char *kernel_data;        /* Reserved for kernel internal use */
#endif
};

#ifdef ARCHDATAM
#define ARCHDATA_SEC_NAME ARCHDATAM
#else
#define ARCHDATA_SEC_NAME "__archdata"
#endif
#define KALLSYMS_SEC_NAME "__kallsyms"


struct new_module_info
{
  unsigned long addr;
  unsigned long size;
  unsigned long flags;
	   long usecount;
};

/* Bits of module.flags.  */
static const int NEW_MOD_RUNNING = 1;
static const int NEW_MOD_DELETED = 2;
static const int NEW_MOD_AUTOCLEAN = 4;
static const int NEW_MOD_VISITED = 8;
static const int 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.  */

static const int QM_MODULES = 1;
static const int QM_DEPS = 2;
static const int QM_REFS = 3;
static const int QM_SYMBOLS = 4;
static const int 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 <[e-mail]>

   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
static const int MODUTILS_OBJ_H = 1;

#ident "$Id: insmod.c,v 1.87 2002/07/02 19:14:23 andersen Exp $"

/* The relocatable object is manipulated using elfin types.  */

#include <stdio.h>
#include <elf.h>
#include <endian.h>

#if __BYTE_ORDER == __LITTLE_ENDIAN
#define ELFDATAM	ELFDATA2LSB
#elif __BYTE_ORDER == __BIG_ENDIAN
#define ELFDATAM	ELFDATA2MSB
#endif

#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;
};