elfaccess.h

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/*

  Copyright (C) 2000, 2001 Silicon Graphics, Inc.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement 
  or the like.  Any license provided herein, whether implied or 
  otherwise, applies only to this software file.  Patent licenses, if 
  any, provided herein do not apply to combinations of this program with 
  other software, or any other product whatsoever.  

  You should have received a copy of the GNU General Public License along
  with this program; if not, write the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston MA 02111-1307, USA.

  Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pky,
  Mountain View, CA 94043, or:

  http://www.sgi.com

  For further information regarding this notice, see:

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*/


/* ====================================================================
 * ====================================================================
 *
 *
 * Revision history:
 *  03-Jun-93 - Original Version
 *
 * Description:
 *
 * This file provides access macros for the ELF structures defined in
 * /usr/include/elf.h and /usr/include/sys/elf.h
 *
 * In general, we define 32-bit and 64-bit versions of the access
 * macros; where they are identical, we also define a common macro.
 *
 * Names follow the convention:   an all-caps
 * prefix indicating the struct type, with a 32 or 64 if appropriate,
 * and a lower-case suffix matching the field name.  (However, the
 * field name prefixes commonly used in the ELF definitions are not
 * part of this name.)  For macros which are not common to 32-bit and
 * 64-bit versions, we define a non-specific version for the "current"
 * model, as indicated by the cpp symbol _64BIT_OBJECTS.
 *
 * We follow the practice of not shifting flags into
 * the lower bit in the macros, for maximum test efficiency.  We also
 * favor efficiency over robustness in other cases.
 *
 * ====================================================================
 * ====================================================================
 */

#ifndef elfaccess_INCLUDED
#define elfaccess_INCLUDED


/* ====================================================================
 *
 * .rel, .rela Section
 *
 * ====================================================================
 */

/* r_info masks for 32-bit: */
#define REL32_SYM_MASK  0xffffff00
#define REL32_SYM_SHIFT 8
#define REL32_TYPE_MASK 0x000000ff

/* Field access macros, for either .rel or .rela sections: */
#define     REL_offset(r)       ((r).r_offset)
#define     REL32_offset(r)     REL_offset(r)
#define     REL32_offset(r)     REL_offset(r)

#define     REL32_sym(r)        ELF32_R_SYM((r).r_info)
#define Set_REL32_sym(r,v) \
    ((r).r_info = ((r).r_info & ~REL32_SYM_MASK) + (v<<REL32_SYM_SHIFT))
#define     REL32_type(r)       ELF32_R_TYPE((r).r_info)
#define Set_REL32_type(r,v) \
    ((r).r_info = ((r).r_info & ~REL32_TYPE_MASK) + (v&REL32_TYPE_MASK))
#define Set_REL32_info(r,s,t) \
    ((r).r_info = ((s)<<REL32_SYM_SHIFT) | ((t)&REL32_TYPE_MASK))

#define     REL64_sym(r)        ((r).r_sym)
#define Set_REL64_sym(r,v)      (REL64_sym(r)=v)
#define     REL64_type(r)       ((r).r_type)
#define Set_REL64_type(r,v)     (REL64_type(r)=v)
#define Set_REL64_info(r,s,t)   (Set_REL64_sym(r,s),Set_REL64_type(r,t))

/* 64-bit only: */
#define     REL64_ssym(r)       ((r).r_ssym)
#define     REL64_type2(r)      ((r).r_type2)
#define     REL64_type3(r)      ((r).r_type3)

/* .rela only: */
#define     REL_addend(r)       ((r).r_addend)
#define     REL32_addend(r)     REL_addend(r)
#define     REL32_addend(r)     REL_addend(r)

/* Model-specific selection: */
#ifdef _64BIT_OBJECTS

#define     REL_sym     REL64_sym
#define Set_REL_sym     Set_REL64_sym
#define     REL_type    REL64_type
#define Set_REL_type    Set_REL64_type
#define Set_REL_info    Set_REL64_info

#else /* 32-bit objects: */

#define     REL_sym     REL32_sym
#define Set_REL_sym     Set_REL32_sym
#define     REL_type    REL32_type
#define Set_REL_type    Set_REL32_type
#define Set_REL_info    Set_REL32_info

#endif

#endif /* elfaccess_INCLUDED */