FreeBSD/Linux Kernel Cross Reference
sys/sys/ksyms.h

     /*      $NetBSD: ksyms.h,v 1.17.4.1 2009/03/31 23:23:15 snj Exp $       */
     
     /*
      * Copyright (c) 2001, 2003 Anders Magnusson (ragge@ludd.luth.se).
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _SYS_KSYMS_H_
    #define _SYS_KSYMS_H_
    
    #ifdef _KSYMS_PRIVATE
    #define ELFSIZE ARCH_ELFSIZE
    #include <sys/exec_elf.h>
    #include <sys/queue.h>
    
    struct ksyms_symtab {
            TAILQ_ENTRY(ksyms_symtab) sd_queue; /* All active tables */
            const char *sd_name;    /* Name of this table */
            Elf_Sym *sd_symstart;   /* Address of symbol table */
            Elf_Sym *sd_minsym;     /* symbol with minimum value */
            Elf_Sym *sd_maxsym;     /* symbol with maximum value */
            char *sd_strstart;      /* Address of corresponding string table */
            int sd_usroffset;       /* Real address for userspace */
            int sd_symsize;         /* Size in bytes of symbol table */
            int sd_strsize;         /* Size of string table */
            bool sd_gone;           /* dead but around for open() */
            bool sd_malloc;         /* XXX REMOVE WHEN LKMS GO */
    };
    
    /*
     * Static allocated ELF header.
     * Basic info is filled in at attach, sizes at open.
     */
    #define SYMTAB          1
    #define STRTAB          2
    #define SHSTRTAB        3
    #define NSECHDR         4
    
    #define NPRGHDR         2
    #define SHSTRSIZ        32
    
    struct ksyms_hdr {
            Elf_Ehdr        kh_ehdr;
            Elf_Phdr        kh_phdr[NPRGHDR];
            Elf_Shdr        kh_shdr[NSECHDR];
            char            kh_strtab[SHSTRSIZ];
    };
    #endif  /* _KSYMS_PRIVATE */
    
    /*
     * Do a lookup of a symbol using the in-kernel lookup algorithm.
     */
    struct ksyms_gsymbol {
            const char *kg_name;
            union {
                    void *ku_sym;            /* Normally Elf_Sym */
                    unsigned long *ku_value;
            } _un;
    #define kg_sym _un.ku_sym
    #define kg_value _un.ku_value
    };
    
    #define KIOCGSYMBOL     _IOW('l', 1, struct ksyms_gsymbol)
    #define KIOCGVALUE      _IOW('l', 2, struct ksyms_gsymbol)
    #define KIOCGSIZE       _IOR('l', 3, int)
    
    
    #ifdef _KERNEL
    /*
     * Definitions used in ksyms_getname() and ksyms_getval().
     */
    #define KSYMS_CLOSEST   0001    /* Nearest lower match */
    #define KSYMS_EXACT     0002    /* Only exact match allowed */
    #define KSYMS_EXTERN    0000    /* Only external symbols (pseudo) */
    #define KSYMS_PROC      0100    /* Procedures only */
    #define KSYMS_ANY       0200    /* Also local symbols (DDB use only) */
    
   /*
    * Prototypes
    */
   int ksyms_getname(const char **, const char **, vaddr_t, int);
   int ksyms_getval(const char *, const char *, unsigned long *, int);
   int ksyms_getval_unlocked(const char *, const char *, unsigned long *, int);
   int ksyms_addsymtab(const char *, void *, vsize_t, char *, vsize_t);
   int ksyms_delsymtab(const char *);
   void ksyms_init(int, void *, void *);
   void ksyms_init_explicit(void *, void *, size_t, void *, size_t);
   void ksyms_init_finalize(void);
   int ksyms_sift(char *, char *, int);
   void ksyms_modload(const char *, void *, vsize_t, char *, vsize_t);
   void ksyms_modunload(const char *);
   
   #endif /* _KERNEL */
   #endif /* _SYS_KSYMS_H_ */

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