libexec/ld.aout_so/ld.h

   1 /*      $NetBSD: ld.h,v 1.2 1998/12/17 23:36:38 pk 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 /*
  33  * Definitions and functions prototypes shared between the
  34  * link-editor, ld(1), and the run-time linker, ld.so(1).
  35  */
  36
  37 #define SUN_COMPAT
  38
  39 #include "md.h"
  40 #include "link.h"
  41
  42 /* If compiled with GNU C, use the built-in alloca */
  43 #if defined(__GNUC__) || defined(sparc)
  44 #define alloca __builtin_alloca
  45 #endif
  46
  47 /* Align to power-of-two boundary */
  48 #define PALIGN(x,p)     (((x) +  (u_long)(p) - 1) & (-(u_long)(p)))
  49
  50 /* Align to machine dependent boundary */
  51 #define MALIGN(x)       PALIGN(x,MAX_ALIGNMENT)
  52
  53 #ifndef nounderscore
  54 #define ETEXT_SYM       "_etext"
  55 #define EDATA_SYM       "_edata"
  56 #define END_SYM         "_end"
  57 #define DYN_SYM         "__DYNAMIC"
  58 #define GOT_SYM         "__GLOBAL_OFFSET_TABLE_"
  59 #define PLT_SYM         "__PROCEDURE_LINKAGE_TABLE_"
  60 #define LPREFIX         'L'
  61 #else
  62 #define ETEXT_SYM       "etext"
  63 #define EDATA_SYM       "edata"
  64 #define END_SYM         "end"
  65 #define DYN_SYM         "_DYNAMIC"
  66 #define GOT_SYM         "_GLOBAL_OFFSET_TABLE_"
  67 #define PLT_SYM         "_PROCEDURE_LINKAGE_TABLE_"
  68 #define LPREFIX         '.'
  69 #endif
  70
  71 /*
  72  * Default macros; these may be overridden in <arch/---/md.h>.
  73  * Note: we only test the existence of RELOC_ADDRESS, so
  74  * you should override all or nothing at all.
  75  *
  76  * See ld.c for an addtional information on their use.
  77  */
  78 #ifndef RELOC_ADDRESS
  79
  80 #define RELOC_ADDRESS(r)                ((r)->r_address)
  81 #define RELOC_EXTERN_P(r)               ((r)->r_extern)
  82 #define RELOC_TYPE(r)                   ((r)->r_symbolnum)
  83 #define RELOC_SYMBOL(r)                 ((r)->r_symbolnum)
  84 #define RELOC_MEMORY_SUB_P(r)           0
  85 #define RELOC_MEMORY_ADD_P(r)           1
  86 #undef RELOC_ADD_EXTRA
  87 #define RELOC_PCREL_P(r)                ((r)->r_pcrel)
  88 #define RELOC_VALUE_RIGHTSHIFT(r)       0
  89 #if defined(RTLD) && defined(SUN_COMPAT)
  90 #define RELOC_TARGET_SIZE(r)            (2)     /* !!!!! Sun BUG compatible */
  91 #else
  92 #define RELOC_TARGET_SIZE(r)            ((r)->r_length)
  93 #endif
  94 #define RELOC_TARGET_BITPOS(r)          0
  95 #define RELOC_TARGET_BITSIZE(r)         32
  96
  97 #define RELOC_JMPTAB_P(r)               ((r)->r_jmptable)
  98 #define RELOC_BASEREL_P(r)              ((r)->r_baserel)
  99 #define RELOC_RELATIVE_P(r)             ((r)->r_relative)
 100 #define RELOC_COPY_P(r)                 ((r)->r_copy)
 101 #define RELOC_LAZY_P(r)                 ((r)->r_jmptable)
 102
 103 #define CHECK_GOT_RELOC(r)              ((r)->r_pcrel)
 104 #define RELOC_PIC_TYPE(r)               ((r)->r_baserel? \
 105                                                 PIC_TYPE_LARGE:PIC_TYPE_NONE)
 106
 107 #endif /* RELOC_ADDRESS */
 108
 109 /* A separately overridable macros */
 110 #ifndef RELOC_INIT_SEGMENT_RELOC
 111 #define RELOC_INIT_SEGMENT_RELOC(r)
 112 #endif
 113
 114 #ifndef MAX_GOTOFF
 115 #define MAX_GOTOFF(x)   (LONG_MAX)
 116 #endif
 117
 118 #ifndef MIN_GOTOFF
 119 #define MIN_GOTOFF(x)   (LONG_MIN)
 120 #endif
 121
 122 #ifndef TEXT_START
 123 #define TEXT_START(x)           N_TXTADDR(x)
 124 #endif
 125
 126 #ifndef DATA_START
 127 #define DATA_START(x)           N_DATADDR(x)
 128 #endif
 129
 130 /* Macros dealing with the set element symbols defined in a.out.h */
 131 #define SET_ELEMENT_P(x)        ((x) >= N_SETA && (x) <= (N_SETB|N_EXT))
 132 #define TYPE_OF_SET_ELEMENT(x)  ((x) - N_SETA + N_ABS)
 133
 134 #define N_ISWEAK(p)             (N_BIND(p) & BIND_WEAK)
 135
 136 /* Functions that must be provided by arch/md.c: */
 137 void    md_init_header    __P((struct exec *, int, int));
 138 long    md_get_addend     __P((struct relocation_info *, unsigned char *));
 139 void    md_relocate       __P((struct relocation_info *, long,
 140                                unsigned char *, int));
 141 int     md_make_reloc     __P((struct relocation_info *,
 142                                struct relocation_info *, int));
 143 void    md_set_breakpoint __P((long, long *));
 144 void    md_make_jmpslot   __P((jmpslot_t *, long, long));
 145 void    md_fix_jmpslot    __P((jmpslot_t *, long, u_long, int));
 146 void    md_make_jmpreloc  __P((struct relocation_info *,
 147                                struct relocation_info *, int));
 148 void    md_make_gotreloc  __P((struct relocation_info *,
 149                                struct relocation_info *, int));
 150 void    md_make_cpyreloc  __P((struct relocation_info *,
 151                                struct relocation_info *));
 152 int     md_midcompat      __P((struct exec *));