compact_reloc.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:

  http://oss.sgi.com/projects/GenInfo/NoticeExplan

*/


#ifndef __COMPACT_RELOC_H__
#define __COMPACT_RELOC_H__

#ifdef __cplusplus
extern "C" {
#endif

/* compact relocation format for o32 */

#include <sgidefs.h>

typedef struct {
    unsigned cm_tag;
    union {
        __uint32_t cm_val;
        __uint32_t cm_ptr;
    } cm_un;
} CM;

#define CM_NULL            0x00000000
#define CM_RELOC_NO        0x00000001
#define CM_RELOC_PTR       0x00000002  

struct full_rlc {
    int type;
    __uint32_t konst;
    __uint32_t vaddr;
    __uint32_t dist2lo;
};

#define CM_R_TYPE_NULL      0
#define CM_R_TYPE_ABS       1
#define CM_R_TYPE_REL32     2
#define CM_R_TYPE_WORD      3
#define CM_R_TYPE_GPHI_LO   4
#define CM_R_TYPE_GOTHI_LO  5
#define CM_R_TYPE_JMPADDR   5   /* this is obsolete and should go away */
#define CM_R_TYPE_GPHI_LO2  6
#define CM_R_TYPE_HI_LO     7

typedef struct {
    char *scn_praw;
    char *rlc_ptr;
    char *cur_rlc_ptr;
    __uint32_t  rlc_no;
    __uint32_t  cur_rlc_no;
    __uint32_t last_base;
    struct full_rlc rlc_entry;
} cm_struct ;


/* this struct must be the same as next, except for the last item, */
/* which is the constant for the addend */
struct COMPACT_RELOC {
    unsigned addend:  2;
#define        ADDEND_NOCONST  0
#define        ADDEND_CONST    1   /* if an addend included, e.g. sym + k */
#define        ADDEND_BASE     2   /* base of address to be relocated */
    unsigned type:    3;           /* relocation type */
    unsigned del_lo:  8;           /* delta to ref_lo from ref_hi, shifted 2 */
    
    signed del_vaddr: 19;          /* delta addr, from previous entry */
                                   /* to be relocated */
#define        DEL_VADDR_MASK   0xFFFF8000
};


struct COMPACT_RELOC_C {
    struct COMPACT_RELOC _rlc;
    __uint32_t addend_const;         /* k of addend */
};

struct COMPACT_RELOC_C_BASE {
    struct COMPACT_RELOC _rlc;
    __uint32_t addend_const;         /* k of addend */
    __uint32_t base;                 /* base for next delta */
};

struct COMPACT_RELOC_BASE {
    struct COMPACT_RELOC _rlc;
    __uint32_t base;                 /* base for next delta */
};


union cm_rlc {
    struct COMPACT_RELOC            r;
    struct COMPACT_RELOC_C_BASE    cb;
    struct COMPACT_RELOC_C          c;
    struct COMPACT_RELOC_BASE       b;
};


#define VADDR_OVFL(delta)  (((delta & DEL_VADDR_MASK) != 0) && \
                            ((delta & DEL_VADDR_MASK) != DEL_VADDR_MASK))

#define VADDR_DELTA(delta) (delta & ~DEL_VADDR_MASK)

    
#ifdef __cplusplus
}
#endif

#endif  /* __COMPACT_RELOC_H__ */