bfd/libaout.h

   1 /* BFD back-end data structures for a.out (and similar) files.
   2
   3    We try to encapsulate the differences in a few routines, and otherwise
   4    share large masses of code.  This means we only have to fix bugs in
   5    one place, most of the time.  */
   6
   7 /* Copyright (C) 1990, 1991 Free Software Foundation, Inc.
   8
   9 This file is part of BFD, the Binary File Diddler.
  10
  11 BFD is free software; you can redistribute it and/or modify
  12 it under the terms of the GNU General Public License as published by
  13 the Free Software Foundation; either version 1, or (at your option)
  14 any later version.
  15
  16 BFD is distributed in the hope that it will be useful,
  17 but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 GNU General Public License for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with BFD; see the file COPYING.  If not, write to
  23 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  24
  25 /* $Id$ */
  26
  27 #ifdef __STDC__
  28 #define CAT3(a,b,c) a##b##c
  29 #else
  30 #define CAT3(a,b,c) a/**/b/**/c
  31 #endif
  32
  33
  34 /* Parameterize the a.out code based on whether it is being built
  35    for a 32-bit architecture or a 64-bit architecture.  */
  36 #if ARCH_SIZE==64
  37 #define GET_WORD bfd_h_get_64
  38 #define GET_SWORD (int64_type)GET_WORD
  39 #define PUT_WORD bfd_h_put_64
  40 #define NAME(x,y) CAT3(x,_64_,y)
  41 #define JNAME(x) CAT(x,_64)
  42 #define BYTES_IN_WORD 8
  43 #else
  44 #define GET_WORD bfd_h_get_32
  45 #define GET_SWORD (int32_type)GET_WORD
  46 #define PUT_WORD bfd_h_put_32
  47 #define NAME(x,y) CAT3(x,_32_,y)
  48 #define JNAME(x) CAT(x,_32)
  49 #define BYTES_IN_WORD 4
  50 #endif
  51
  52 #define adata(bfd)              ((struct aoutdata *) ((bfd)->tdata))
  53 #define exec_hdr(bfd)           (adata(bfd)->hdr)
  54 #define obj_textsec(bfd)        (adata(bfd)->textsec)
  55 #define obj_datasec(bfd)        (adata(bfd)->datasec)
  56 #define obj_bsssec(bfd)         (adata(bfd)->bsssec)
  57 #define obj_sym_filepos(bfd)    (adata(bfd)->sym_filepos)
  58 #define obj_str_filepos(bfd)    (adata(bfd)->str_filepos)
  59
  60 #define obj_reloc_entry_size(bfd) (adata(bfd)->reloc_entry_size)
  61
  62 typedef struct aout_symbol {
  63   asymbol symbol;
  64   short desc;
  65   char other;
  66   unsigned char type;
  67 } aout_symbol_type;
  68
  69 struct aoutdata {
  70   struct internal_exec *hdr;               /* exec file header */
  71   aout_symbol_type *symbols;            /* symtab for input bfd */
  72
  73
  74   /* For ease, we do this */
  75   asection *textsec;
  76   asection *datasec;
  77   asection *bsssec;
  78
  79   /* We remember these offsets so that after check_file_format, we have
  80      no dependencies on the particular format of the exec_hdr.  */
  81   file_ptr sym_filepos;
  82   file_ptr str_filepos;
  83
  84   /* Size of a relocation entry */
  85   unsigned reloc_entry_size;
  86 };
  87
  88
  89 #define obj_outsymbols(bfd) ((PTR)(((struct aoutdata *) ((bfd)->tdata))->outsymbols))
  90
  91
  92 /* We take the address of the first element of an asymbol to ensure that the
  93  * macro is only ever applied to an asymbol */
  94 #define aout_symbol(asymbol) ((aout_symbol_type *)(&(asymbol)->the_bfd))
  95
  96 /*#define obj_symbols(bfd) ((((struct aoutdata *) ((bfd)->tdata))->symbols))*/
  97 #define obj_aout_symbols(bfd) ((((struct aoutdata *) (bfd)->tdata))->symbols)
  98 #define obj_arch_flags(bfd) ((((struct aoutdata *) (bfd)->tdata))->arch_flags)
  99
 100 #define get_tdata(x)  ((struct aoutdata *)((x)->tdata))
 101
 102 /* Prototype declarations for functions defined in aoutx.h  */
 103
 104 PROTO (boolean, NAME(aout,squirt_out_relocs),(bfd *abfd, asection *section));
 105
 106 PROTO (bfd_target *, NAME(aout,some_aout_object_p), (bfd *abfd,
 107                                           bfd_target *(*callback)()));
 108 PROTO (boolean, NAME(aout,mkobject), (bfd *abfd));
 109 PROTO (enum machine_type, NAME(aout,machine_type), (enum bfd_architecture arch,
 110                                                 unsigned long machine));
 111 PROTO (boolean, NAME(aout,set_arch_mach), (bfd *abfd, enum bfd_architecture arch,
 112                                                 unsigned long machine));
 113
 114 PROTO (boolean, NAME(aout,new_section_hook), (bfd *abfd, asection *newsect));
 115 PROTO (boolean, NAME(aout,set_section_contents), (bfd *abfd, sec_ptr section,
 116                          PTR location, file_ptr offset, bfd_size_type count));
 117
 118 PROTO (asymbol *,NAME(aout,make_empty_symbol), (bfd *abfd));
 119 PROTO (boolean, NAME(aout,slurp_symbol_table), (bfd *abfd));
 120 PROTO (void,    NAME(aout,write_syms), (bfd *abfd));
 121 PROTO (void,    NAME(aout,reclaim_symbol_table), (bfd *abfd));
 122 PROTO (unsigned int, NAME(aout,get_symtab_upper_bound), (bfd *abfd));
 123 PROTO (unsigned int, NAME(aout,get_symtab), (bfd *abfd, asymbol **location));
 124 PROTO (boolean, NAME(aout,slurp_reloc_table), (bfd *abfd, sec_ptr asect,
 125                                          asymbol **symbols));
 126 PROTO (unsigned int, NAME(aout,canonicalize_reloc), (bfd *abfd, sec_ptr section,
 127                                          arelent **relptr, asymbol **symbols));
 128 PROTO (unsigned int, NAME(aout,get_reloc_upper_bound), (bfd *abfd, sec_ptr asect));
 129 PROTO (void,    NAME(aout,reclaim_reloc), (bfd *ignore_abfd, sec_ptr ignore));
 130 PROTO (alent *, NAME(aout,get_lineno), (bfd *ignore_abfd, asymbol *ignore_symbol));
 131 PROTO (void,    NAME(aout,print_symbol), (bfd *ignore_abfd, PTR file,
 132                             asymbol *symbol, bfd_print_symbol_enum_type how));
 133 PROTO (boolean, NAME(aout,close_and_cleanup), (bfd *abfd));
 134 PROTO (boolean, NAME(aout,find_nearest_line), (bfd *abfd, asection *section,
 135       asymbol **symbols, bfd_vma offset, CONST char **filename_ptr,
 136       CONST char **functionname_ptr, unsigned int *line_ptr));
 137 PROTO (int,     NAME(aout,sizeof_headers), (bfd *ignore_abfd, boolean exec));
 138
 139
 140 PROTO (void,    NAME(aout,swap_exec_header_in), (bfd *abfd,
 141                          struct external_exec *raw_bytes, struct internal_exec *execp));
 142
 143 PROTO (void,    NAME(aout,swap_exec_header_out),(bfd *abfd, struct internal_exec *execp,
 144                          struct external_exec *raw_bytes));
 145
 146 /* A.out uses the generic versions of these routines... */
 147
 148 #define aout_32_get_section_contents    bfd_generic_get_section_contents
 149 #define aout_32_close_and_cleanup       bfd_generic_close_and_cleanup
 150
 151 #define aout_64_get_section_contents    bfd_generic_get_section_contents
 152 #define aout_64_close_and_cleanup       bfd_generic_close_and_cleanup
 153
 154 /* Calculate the file positions of the parts of a newly read aout header */
 155 #define WORK_OUT_FILE_POSITIONS(abfd, execp)                            \
 156   obj_datasec (abfd)->vma = N_DATADDR(*execp);                          \
 157   obj_bsssec (abfd)->vma = N_BSSADDR(*execp);                           \
 158   obj_textsec (abfd)->vma = N_TXTADDR(*execp);                          \
 159                                                                         \
 160   /* The file offsets of the sections */                                \
 161   obj_textsec (abfd)->filepos = N_TXTOFF (*execp);                      \
 162   obj_datasec (abfd)->filepos = N_DATOFF (*execp);                      \
 163                                                                         \
 164   /* The file offsets of the relocation info */                         \
 165   obj_textsec (abfd)->rel_filepos = N_TRELOFF(*execp);                  \
 166   obj_datasec (abfd)->rel_filepos = N_DRELOFF(*execp);                  \
 167                                                                         \
 168   /* The file offsets of the string table and symbol table.  */         \
 169   obj_sym_filepos (abfd) = N_SYMOFF (*execp);                           \
 170   obj_str_filepos (abfd) = N_STROFF (*execp);                           \
 171
 172
 173 #define WRITE_HEADERS(abfd, execp)                                            \
 174       {                                                                       \
 175         if (abfd->flags & D_PAGED)                                            \
 176             {                                                                 \
 177               execp->a_text = obj_textsec (abfd)->size + EXEC_BYTES_SIZE;     \
 178               N_SET_MAGIC (*execp, ZMAGIC);                                   \
 179             }                                                                 \
 180         else if (abfd->flags & WP_TEXT)                                       \
 181             {                                                                 \
 182               N_SET_MAGIC (*execp, NMAGIC);                                   \
 183             }                                                                 \
 184         else {                                                                \
 185           N_SET_MAGIC(*execp, OMAGIC);                                        \
 186         }                                                                     \
 187         if (abfd->flags & D_PAGED)                                            \
 188             {                                                                 \
 189               data_pad = ((obj_datasec(abfd)->size + PAGE_SIZE -1)            \
 190                           & (- PAGE_SIZE)) - obj_datasec(abfd)->size;         \
 191                                                                               \
 192               if (data_pad > obj_bsssec(abfd)->size)                          \
 193                 execp->a_bss = 0;                                             \
 194               else                                                            \
 195                 execp->a_bss = obj_bsssec(abfd)->size - data_pad;             \
 196               execp->a_data = obj_datasec(abfd)->size + data_pad;             \
 197             }                                                                 \
 198         else                                                                  \
 199             {                                                                 \
 200               execp->a_data = obj_datasec (abfd)->size;                       \
 201               execp->a_bss = obj_bsssec (abfd)->size;                         \
 202             }                                                                 \
 203                                                                               \
 204         execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_LIST_SIZE;         \
 205         execp->a_entry = bfd_get_start_address (abfd);                        \
 206                                                                               \
 207         execp->a_trsize = ((obj_textsec (abfd)->reloc_count) *                \
 208                            obj_reloc_entry_size (abfd));                      \
 209         execp->a_drsize = ((obj_datasec (abfd)->reloc_count) *                \
 210                            obj_reloc_entry_size (abfd));                      \
 211         NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes);           \
 212                                                                               \
 213         bfd_seek (abfd, 0L, false);                                           \
 214         bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd);              \
 215         /* Now write out reloc info, followed by syms and strings */          \
 216                                                                               \
 217         if (bfd_get_symcount (abfd) != 0)                                     \
 218             {                                                                 \
 219               bfd_seek (abfd,                                                 \
 220                         (long)(N_SYMOFF(*execp)), false);                     \
 221                                                                               \
 222               NAME(aout,write_syms)(abfd);                                    \
 223                                                                               \
 224               bfd_seek (abfd,   (long)(N_TRELOFF(*execp)), false);            \
 225                                                                               \
 226               if (!NAME(aout,squirt_out_relocs) (abfd, obj_textsec (abfd))) return false; \
 227               bfd_seek (abfd, (long)(N_DRELOFF(*execp)), false);              \
 228                                                                               \
 229               if (!NAME(aout,squirt_out_relocs)(abfd, obj_datasec (abfd))) return false; \
 230             }                                                                 \
 231       }