gcc/collect2-aix.h

   1 /* AIX cross support for collect2.
   2    Copyright (C) 2009-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_COLLECT2_AIX_H
  21 #define GCC_COLLECT2_AIX_H
  22 /* collect2-aix.c requires mmap support.  It should otherwise be
  23    fairly portable.  */
  24 #if defined(CROSS_DIRECTORY_STRUCTURE) \
  25     && defined(TARGET_AIX_VERSION) \
  26     && HAVE_MMAP
  27
  28 #define CROSS_AIX_SUPPORT 1
  29
  30 /* -------------------------------------------------------------------------
  31    Definitions adapted from bfd.  (Fairly heavily adapted in some cases.)
  32    ------------------------------------------------------------------------- */
  33
  34 /* Compatibility types for bfd.  */
  35 typedef unsigned HOST_WIDE_INT bfd_vma;
  36
  37 /* The size of an archive's fl_magic field.  */
  38 #define FL_MAGIC_SIZE 8
  39
  40 /* The expected contents of fl_magic for big archives.  */
  41 #define FL_MAGIC_BIG_AR "<bigaf>\012"
  42
  43 /* The size of each offset string in the header of a big archive.  */
  44 #define AR_BIG_OFFSET_SIZE 20
  45
  46 /* The format of the file header in a "big" XCOFF archive.  */
  47 struct external_big_ar_filehdr
  48 {
  49   /* Magic string.  */
  50   char fl_magic[FL_MAGIC_SIZE];
  51
  52   /* Offset of the member table (decimal ASCII string).  */
  53   char fl_memoff[AR_BIG_OFFSET_SIZE];
  54
  55   /* Offset of the global symbol table for 32-bit objects (decimal ASCII
  56      string).  */
  57   char fl_symoff[AR_BIG_OFFSET_SIZE];
  58
  59   /* Offset of the global symbol table for 64-bit objects (decimal ASCII
  60      string).  */
  61   char fl_symoff64[AR_BIG_OFFSET_SIZE];
  62
  63   /* Offset of the first member in the archive (decimal ASCII string).  */
  64   char fl_firstmemoff[AR_BIG_OFFSET_SIZE];
  65
  66   /* Offset of the last member in the archive (decimal ASCII string).  */
  67   char fl_lastmemoff[AR_BIG_OFFSET_SIZE];
  68
  69   /* Offset of the first member on the free list (decimal ASCII
  70      string).  */
  71   char fl_freeoff[AR_BIG_OFFSET_SIZE];
  72 };
  73
  74 /* Each archive name is followed by this many bytes of magic string.  */
  75 #define SXCOFFARFMAG 2
  76
  77 /* The format of a member header in a "big" XCOFF archive.  */
  78 struct external_big_ar_member
  79 {
  80   /* File size not including the header (decimal ASCII string).  */
  81   char ar_size[AR_BIG_OFFSET_SIZE];
  82
  83   /* File offset of next archive member (decimal ASCII string).  */
  84   char ar_nextoff[AR_BIG_OFFSET_SIZE];
  85
  86   /* File offset of previous archive member (decimal ASCII string).  */
  87   char ar_prevoff[AR_BIG_OFFSET_SIZE];
  88
  89   /* File mtime (decimal ASCII string).  */
  90   char ar_date[12];
  91
  92   /* File UID (decimal ASCII string).  */
  93   char ar_uid[12];
  94
  95   /* File GID (decimal ASCII string).  */
  96   char ar_gid[12];
  97
  98   /* File mode (octal ASCII string).  */
  99   char ar_mode[12];
 100
 101   /* Length of file name (decimal ASCII string).  */
 102   char ar_namlen[4];
 103
 104   /* This structure is followed by the file name.  The length of the
 105      name is given in the namlen field.  If the length of the name is
 106      odd, the name is followed by a null byte.  The name and optional
 107      null byte are followed by XCOFFARFMAG, which is not included in
 108      namlen.  The contents of the archive member follow; the number of
 109      bytes is given in the size field.  */
 110 };
 111
 112 /* The known values of f_magic in an XCOFF file header.  */
 113 #define U802WRMAGIC 0730        /* Writeable text segments.  */
 114 #define U802ROMAGIC 0735        /* Readonly sharable text segments.  */
 115 #define U802TOCMAGIC 0737       /* Readonly text segments and TOC.  */
 116 #define U803XTOCMAGIC 0757      /* Aix 4.3 64-bit XCOFF.  */
 117 #define U64_TOCMAGIC 0767       /* AIX 5+ 64-bit XCOFF.  */
 118
 119 /* The number of bytes in an XCOFF file's f_magic field.  */
 120 #define F_MAGIC_SIZE 2
 121
 122 /* The format of a 32-bit XCOFF file header.  */
 123 struct external_filehdr_32
 124 {
 125   /* The magic number.  */
 126   char f_magic[F_MAGIC_SIZE];
 127
 128   /* The number of sections.  */
 129   char f_nscns[2];
 130
 131   /* Time & date stamp.  */
 132   char f_timdat[4];
 133
 134   /* The offset of the symbol table from the start of the file.  */
 135   char f_symptr[4];
 136
 137   /* The number of entries in the symbol table.  */
 138   char f_nsyms[4];
 139
 140   /* The size of the auxiliary header.  */
 141   char f_opthdr[2];
 142
 143   /* Flags.  */
 144   char f_flags[2];
 145 };
 146
 147 /* The format of a 64-bit XCOFF file header.  */
 148 struct external_filehdr_64
 149 {
 150   /* The magic number.  */
 151   char f_magic[F_MAGIC_SIZE];
 152
 153   /* The number of sections.  */
 154   char f_nscns[2];
 155
 156   /* Time & date stamp.  */
 157   char f_timdat[4];
 158
 159   /* The offset of the symbol table from the start of the file.  */
 160   char f_symptr[8];
 161
 162   /* The size of the auxiliary header.  */
 163   char f_opthdr[2];
 164
 165   /* Flags.  */
 166   char f_flags[2];
 167
 168   /* The number of entries in the symbol table.  */
 169   char f_nsyms[4];
 170 };
 171
 172 /* An internal representation of the XCOFF file header.  */
 173 struct internal_filehdr
 174 {
 175   unsigned short f_magic;
 176   unsigned short f_nscns;
 177   long f_timdat;
 178   bfd_vma f_symptr;
 179   long f_nsyms;
 180   unsigned short f_opthdr;
 181   unsigned short f_flags;
 182 };
 183
 184 /* Symbol classes have their names in the debug section if this flag
 185    is set.  */
 186 #define DBXMASK 0x80
 187
 188 /* The format of an XCOFF symbol-table entry.  */
 189 struct external_syment
 190 {
 191   union {
 192     struct {
 193       union {
 194         /* The name of the symbol.  There is an implicit null character
 195            after the end of the array.  */
 196         char n_name[8];
 197         struct {
 198           /* If n_zeroes is zero, n_offset is the offset the name from
 199              the start of the string table.  */
 200           char n_zeroes[4];
 201           char n_offset[4];
 202         } u;
 203       } u;
 204
 205       /* The symbol's value.  */
 206       char n_value[4];
 207     } xcoff32;
 208     struct {
 209       /* The symbol's value.  */
 210       char n_value[8];
 211
 212       /* The offset of the symbol from the start of the string table.  */
 213       char n_offset[4];
 214     } xcoff64;
 215   } u;
 216
 217   /* The number of the section to which this symbol belongs.  */
 218   char n_scnum[2];
 219
 220   /* The type of symbol.  (It can be interpreted as an n_lang
 221      and an n_cpu byte, but we don't care about that here.)  */
 222   char n_type[2];
 223
 224   /* The class of symbol (a C_* value).  */
 225   char n_sclass[1];
 226
 227   /* The number of auxiliary symbols attached to this entry.  */
 228   char n_numaux[1];
 229 };
 230
 231 /* Definitions required by collect2.  */
 232 #define C_EXT 2
 233
 234 #define F_SHROBJ    0x2000
 235 #define F_LOADONLY  0x4000
 236
 237 #define N_UNDEF ((short) 0)
 238 #define N_TMASK 060
 239 #define N_BTSHFT 4
 240
 241 #define DT_NON 0
 242 #define DT_FCN 2
 243
 244 /* -------------------------------------------------------------------------
 245    Local code.
 246    ------------------------------------------------------------------------- */
 247
 248 /* An internal representation of an XCOFF symbol-table entry,
 249    which is associated with the API-defined SYMENT type.  */
 250 struct internal_syment
 251 {
 252   char n_name[9];
 253   unsigned int n_zeroes;
 254   bfd_vma n_offset;
 255   bfd_vma n_value;
 256   short n_scnum;
 257   unsigned short n_flags;
 258   unsigned short n_type;
 259   unsigned char n_sclass;
 260   unsigned char n_numaux;
 261 };
 262 typedef struct internal_syment SYMENT;
 263
 264 /* The internal representation of the API-defined LDFILE type.  */
 265 struct internal_ldfile
 266 {
 267   /* The file handle for the associated file, or -1 if it hasn't been
 268      opened yet.  */
 269   int fd;
 270
 271   /* The start of the current XCOFF object, if one has been mapped
 272      into memory.  Null otherwise.  */
 273   char *object;
 274
 275   /* The offset of OBJECT from the start of the containing page.  */
 276   size_t page_offset;
 277
 278   /* The size of the file pointed to by OBJECT.  Valid iff OFFSET
 279      is nonnull.  */
 280   size_t object_size;
 281
 282   /* The offset of the next member in an archive after OBJECT,
 283      or -1 if this isn't an archive.  Valid iff OFFSET is nonnull.  */
 284   off_t next_member;
 285
 286   /* The parsed version of the XCOFF file header.  */
 287   struct internal_filehdr filehdr;
 288 };
 289 typedef struct internal_ldfile LDFILE;
 290
 291 /* The API allows the file header to be directly accessed via this macro.  */
 292 #define HEADER(FILE) ((FILE)->filehdr)
 293
 294 /* API-defined return codes.  SUCCESS must be > 0 and FAILURE must be <= 0.  */
 295 #define SUCCESS 1
 296 #define FAILURE 0
 297
 298 /* API-defined functions.  */
 299 extern LDFILE *ldopen (char *, LDFILE *);
 300 extern char *ldgetname (LDFILE *, SYMENT *);
 301 extern int ldtbread (LDFILE *, long, SYMENT *);
 302 extern int ldclose (LDFILE *);
 303
 304 #endif
 305
 306 #endif /* GCC_COLLECT2_AIX_H */