libexec/ld.aout_so/arch/i386/md.h

   1 /*      $NetBSD: md.h,v 1.14 2002/12/10 17:14:37 thorpej Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Paul Kranenburg.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if defined(CROSS_LINKER) && defined(XHOST) && XHOST==sparc
  33 #define NEED_SWAP
  34 #endif
  35
  36 #define MAX_ALIGNMENT           (sizeof (long))
  37
  38 #ifdef NetBSD
  39 #define PAGSIZ                  AOUT_LDPGSZ
  40 #else
  41 #define PAGSIZ                  4096
  42 #endif
  43
  44 #if defined(NetBSD) || defined(CROSS_LINKER)
  45
  46 #define N_SET_FLAG(ex,f)        (oldmagic || N_GETMAGIC(ex)==QMAGIC ? (0) : \
  47                                         N_SETMAGIC(ex,                  \
  48                                                    N_GETMAGIC(ex),      \
  49                                                    MID_MACHINE,         \
  50                                                    N_GETFLAG(ex)|(f)))
  51
  52 #define N_IS_DYNAMIC(ex)        ((N_GETFLAG(ex) & EX_DYNAMIC))
  53
  54 #define N_BADMID(ex) \
  55         (N_GETMID(ex) != 0 && N_GETMID(ex) != MID_MACHINE)
  56
  57 #endif
  58
  59 /*
  60  * FreeBSD does it differently
  61  */
  62 #ifdef FreeBSD
  63 #define N_SET_FLAG(ex,f)        (oldmagic ? (0) :                       \
  64                                   (netzmagic == 0 ?                     \
  65                                         N_SETMAGIC(ex,                  \
  66                                                    N_GETMAGIC(ex),      \
  67                                                    MID_MACHINE,         \
  68                                                    N_GETFLAG(ex)|(f)) : \
  69                                         N_SETMAGIC_NET(ex,              \
  70                                                    N_GETMAGIC_NET(ex),  \
  71                                                    MID_MACHINE,         \
  72                                                    N_GETFLAG_NET(ex)|(f)) ))
  73
  74 #define N_IS_DYNAMIC(ex)        ((N_GETMAGIC_NET(ex) == ZMAGIC) ?       \
  75                                 ((N_GETFLAG_NET(ex) & EX_DYNAMIC)) :    \
  76                                 ((N_GETFLAG(ex) & EX_DYNAMIC) ))
  77 #define N_BADMID(ex) 0
  78 #endif
  79
  80 /*
  81  * Should be handled by a.out.h ?
  82  */
  83 #define N_ADJUST(ex)            (((ex).a_entry < PAGSIZ) ? -PAGSIZ : 0)
  84 #define TEXT_START(ex)          (N_TXTADDR(ex) + N_ADJUST(ex))
  85 #define DATA_START(ex)          (N_DATADDR(ex) + N_ADJUST(ex))
  86
  87 #define RELOC_STATICS_THROUGH_GOT_P(r)          (0)
  88 #define JMPSLOT_NEEDS_RELOC                     (0)
  89 #define JMPSLOT_NONEXTERN_IS_INTERMODULE        (0)
  90
  91 #define md_got_reloc(r)                 (0)
  92
  93 #define md_get_rt_segment_addend(r,a)   md_get_addend(r,a)
  94
  95 /* Width of a Global Offset Table entry */
  96 #define GOT_ENTRY_SIZE  4
  97 typedef long    got_t;
  98
  99 typedef struct jmpslot {
 100         u_short opcode;
 101         u_short addr[2];
 102         u_short reloc_index;
 103 #define JMPSLOT_RELOC_MASK              0xffff
 104 } jmpslot_t;
 105
 106 #define NOP     0x90
 107 #define CALL    0xe890          /* NOP + CALL opcode */
 108 #define JUMP    0xe990          /* NOP + JMP opcode */
 109 #define TRAP    0xcc            /* INT 3 */
 110
 111 /*
 112  * Byte swap defs for cross linking
 113  */
 114
 115 #if !defined(NEED_SWAP)
 116
 117 #define md_swapin_exec_hdr(h)
 118 #define md_swapout_exec_hdr(h)
 119 #define md_swapin_symbols(s,n)
 120 #define md_swapout_symbols(s,n)
 121 #define md_swapin_zsymbols(s,n)
 122 #define md_swapout_zsymbols(s,n)
 123 #define md_swapin_reloc(r,n)
 124 #define md_swapout_reloc(r,n)
 125 #define md_swapin__dynamic(l)
 126 #define md_swapout__dynamic(l)
 127 #define md_swapin_section_dispatch_table(l)
 128 #define md_swapout_section_dispatch_table(l)
 129 #define md_swapin_so_debug(d)
 130 #define md_swapout_so_debug(d)
 131 #define md_swapin_rrs_hash(f,n)
 132 #define md_swapout_rrs_hash(f,n)
 133 #define md_swapin_sod(l,n)
 134 #define md_swapout_sod(l,n)
 135 #define md_swapout_jmpslot(j,n)
 136 #define md_swapout_got(g,n)
 137 #define md_swapin_ranlib_hdr(h,n)
 138 #define md_swapout_ranlib_hdr(h,n)
 139
 140 #endif /* NEED_SWAP */
 141
 142 #ifdef CROSS_LINKER
 143
 144 #define get_byte(p)     ( ((unsigned char *)(p))[0] )
 145
 146 #define get_short(p)    ( ( ((unsigned char *)(p))[0] << 8) | \
 147                           ( ((unsigned char *)(p))[1]     )   \
 148                         )
 149
 150 #define get_long(p)     ( ( ((unsigned char *)(p))[0] << 24) | \
 151                           ( ((unsigned char *)(p))[1] << 16) | \
 152                           ( ((unsigned char *)(p))[2] << 8 ) | \
 153                           ( ((unsigned char *)(p))[3]      )   \
 154                         )
 155
 156 #define put_byte(p, v)  { ((unsigned char *)(p))[0] = ((unsigned long)(v)); }
 157
 158 #define put_short(p, v) { ((unsigned char *)(p))[0] =                   \
 159                                 ((((unsigned long)(v)) >> 8) & 0xff);   \
 160                           ((unsigned char *)(p))[1] =                   \
 161                                 ((((unsigned long)(v))     ) & 0xff); }
 162
 163 #define put_long(p, v)  { ((unsigned char *)(p))[0] =                   \
 164                                 ((((unsigned long)(v)) >> 24) & 0xff);  \
 165                           ((unsigned char *)(p))[1] =                   \
 166                                 ((((unsigned long)(v)) >> 16) & 0xff);  \
 167                           ((unsigned char *)(p))[2] =                   \
 168                                 ((((unsigned long)(v)) >>  8) & 0xff);  \
 169                           ((unsigned char *)(p))[3] =                   \
 170                                 ((((unsigned long)(v))      ) & 0xff); }
 171
 172 #ifdef NEED_SWAP
 173
 174 /* Define IO byte swapping routines */
 175
 176 void    md_swapin_exec_hdr __P((struct exec *));
 177 void    md_swapout_exec_hdr __P((struct exec *));
 178 void    md_swapin_reloc __P((struct relocation_info *, int));
 179 void    md_swapout_reloc __P((struct relocation_info *, int));
 180 void    md_swapout_jmpslot __P((jmpslot_t *, int));
 181
 182 #define md_swapin_symbols(s,n)                  swap_symbols(s,n)
 183 #define md_swapout_symbols(s,n)                 swap_symbols(s,n)
 184 #define md_swapin_zsymbols(s,n)                 swap_zsymbols(s,n)
 185 #define md_swapout_zsymbols(s,n)                swap_zsymbols(s,n)
 186 #define md_swapin__dynamic(l)                   swap__dynamic(l)
 187 #define md_swapout__dynamic(l)                  swap__dynamic(l)
 188 #define md_swapin_section_dispatch_table(l)     swap_section_dispatch_table(l)
 189 #define md_swapout_section_dispatch_table(l)    swap_section_dispatch_table(l)
 190 #define md_swapin_so_debug(d)                   swap_so_debug(d)
 191 #define md_swapout_so_debug(d)                  swap_so_debug(d)
 192 #define md_swapin_rrs_hash(f,n)                 swap_rrs_hash(f,n)
 193 #define md_swapout_rrs_hash(f,n)                swap_rrs_hash(f,n)
 194 #define md_swapin_sod(l,n)                      swapin_sod(l,n)
 195 #define md_swapout_sod(l,n)                     swapout_sod(l,n)
 196 #define md_swapout_got(g,n)                     swap_longs((long*)(g),n)
 197 #define md_swapin_ranlib_hdr(h,n)               swap_ranlib_hdr(h,n)
 198 #define md_swapout_ranlib_hdr(h,n)              swap_ranlib_hdr(h,n)
 199
 200 #define md_swap_short(x) ( (((x) >> 8) & 0xff) | (((x) & 0xff) << 8) )
 201
 202 #define md_swap_long(x) ( (((x) >> 24) & 0xff    ) | (((x) >> 8 ) & 0xff00   ) | \
 203                         (((x) << 8 ) & 0xff0000) | (((x) << 24) & 0xff000000))
 204
 205 #else   /* We need not swap, but must pay attention to alignment: */
 206
 207 #define md_swap_short(x)        (x)
 208 #define md_swap_long(x)         (x)
 209
 210 #endif /* NEED_SWAP */
 211
 212 #else   /* Not a cross linker: use native */
 213
 214 #define md_swap_short(x)                (x)
 215 #define md_swap_long(x)                 (x)
 216
 217 #define get_byte(where)                 (*(char *)(where))
 218 #define get_short(where)                (*(short *)(where))
 219 #define get_long(where)                 (*(long *)(where))
 220
 221 #define put_byte(where,what)            (*(char *)(where) = (what))
 222 #define put_short(where,what)           (*(short *)(where) = (what))
 223 #define put_long(where,what)            (*(long *)(where) = (what))
 224
 225 #endif /* CROSS_LINKER */