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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [bfd/] [aout-cris.c] - Blame information for rev 841

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1 330 jeremybenn
/* BFD backend for CRIS a.out binaries.
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   Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2009
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   Free Software Foundation, Inc.
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   Contributed by Axis Communications AB.
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   Written by Hans-Peter Nilsson.
6
 
7
   This file is part of BFD, the Binary File Descriptor library.
8
 
9
   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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14
   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
18
 
19
   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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24
/* See info in the file PORTING for documentation of these macros and
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   functions.  Beware; some of the information there is outdated.  */
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#define N_HEADER_IN_TEXT(x) 0
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#define N_TXTOFF(x)         32
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#define ENTRY_CAN_BE_ZERO
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#define TEXT_START_ADDR     0
31
 
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/* Without reading symbols to get the text start symbol, there is no way
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   to know where the text segment starts in an a.out file.  Defaulting to
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   anything as constant as TEXT_START_ADDR is bad.  But we can guess from
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   the entry point, which is usually within the first 64k of the text
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   segment.  We also assume here that the text segment is 64k-aligned.
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   FIXME: It is also wrong to assume that data and bss follow immediately
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   after text, but with those, we don't have any choice besides reading
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   symbol info, and luckily there's no pressing need for correctness for
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   those vma:s at this time.  */
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#define N_TXTADDR(x) ((x).a_entry & ~(bfd_vma) 0xffff)
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43
/* If you change this to 4, you can not link to an address N*4+2.  */
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#define SEGMENT_SIZE 2
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/* For some reason, if the a.out file has Z_MAGIC, then
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   adata(abfd).exec_bytes_size is not used, but rather
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   adata(abfd).zmagic_disk_block_size, even though the exec_header is
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   *not* included in the text segment.  A simple workaround is to
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   #define ZMAGIC_DISK_BLOCK_SIZE, which is used if defined; otherwise
51
   TARGET_PAGE_SIZE is used.  */
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#define ZMAGIC_DISK_BLOCK_SIZE     N_TXTOFF (0)
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54
/* It seems odd at first to set a page-size this low, but gives greater
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   freedom in where things can be linked.  The drawback is that you have
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   to set alignment and padding in linker scripts.  */
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#define TARGET_PAGE_SIZE SEGMENT_SIZE
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#define TARGETNAME "a.out-cris"
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60
/* The definition here seems not used; just provided as a convention.  */
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#define DEFAULT_ARCH bfd_arch_cris
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/* Do not "beautify" the CONCAT* macro args.  Traditional C will not
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   remove whitespace added here, and thus will fail to concatenate
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   the tokens.  */
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#define MY(OP) CONCAT2 (cris_aout_,OP)
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#define NAME(x, y) CONCAT3 (cris_aout,_32_,y)
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69
#include "bfd.h"
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71
/* Version 1 of the header.  */
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#define MY_exec_hdr_flags 1
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74
#define MY_write_object_contents MY (write_object_contents)
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static bfd_boolean MY (write_object_contents) (bfd *);
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77
/* Forward this, so we can use a pointer to it in PARAMS.  */
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struct reloc_ext_external;
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80
#define MY_swap_ext_reloc_out MY (swap_ext_reloc_out)
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static void MY (swap_ext_reloc_out) (bfd *, arelent *, struct reloc_ext_external *);
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#define MY_swap_ext_reloc_in MY (swap_ext_reloc_in)
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static void MY (swap_ext_reloc_in) (bfd *, struct reloc_ext_external *,
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                                    arelent *, asymbol **, bfd_size_type);
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87
#define MY_set_sizes MY (set_sizes)
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static bfd_boolean MY (set_sizes) (bfd *);
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90
/* To set back reloc_size to ext, we make MY (set_sizes) be called
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   through this construct.  Note that MY_set_arch_mach is only called
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   through SET_ARCH_MACH.  The default bfd_default_set_arch_mach will
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   not call set_sizes.  */
94
 
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#define MY_set_arch_mach NAME (aout, set_arch_mach)
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#define SET_ARCH_MACH(BFD, EXEC) \
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 MY_set_arch_mach (BFD, DEFAULT_ARCH, N_MACHTYPE (EXEC))
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/* These macros describe the binary layout of the reloc information we
100
   use in a file.  */
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#define RELOC_EXT_BITS_EXTERN_LITTLE  0x80
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#define RELOC_EXT_BITS_TYPE_LITTLE    3
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#define RELOC_EXT_BITS_TYPE_SH_LITTLE 0
104
 
105
#ifndef MY_get_section_contents
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#define MY_get_section_contents aout_32_get_section_contents
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#endif
108
 
109
#define MACHTYPE_OK(mtype) ((mtype) == M_CRIS)
110
 
111
/* Include generic functions (some are overridden above).  */
112
#include "aout32.c"
113
#include "aout-target.h"
114
 
115
/* We need our own version to set header flags.  */
116
 
117
static bfd_boolean
118
MY (write_object_contents) (bfd *abfd)
119
{
120
  struct external_exec exec_bytes;
121
  struct internal_exec *execp = exec_hdr (abfd);
122
 
123
  /* We set the reloc type to RELOC_EXT_SIZE, although setting it at all
124
     seems unnecessary when inspecting as and ld behavior (not an
125
     exhaustive inspection).  The default write_object_contents
126
     definition sets RELOC_EXT_SIZE, so we follow suite and set it too.  */
127
  obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
128
 
129
  /* Setting N_SET_MACHTYPE and using N_SET_FLAGS is not performed by
130
     the default definition.  */
131
  if (bfd_get_arch (abfd) == bfd_arch_cris)
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    N_SET_MACHTYPE (*execp, M_CRIS);
133
 
134
  N_SET_FLAGS (*execp, aout_backend_info (abfd)->exec_hdr_flags);
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136
  WRITE_HEADERS (abfd, execp);
137
 
138
  return TRUE;
139
}
140
 
141
/* We need our own for these reasons:
142
   - Assert that a normal 8, 16 or 32 reloc is output.
143
   - Fix what seems to be a weak-bug (perhaps there for valid reasons).  */
144
 
145
static void
146
MY (swap_ext_reloc_out) (bfd *abfd,
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                         arelent *g,
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                         struct reloc_ext_external *natptr)
149
{
150
  int r_index;
151
  int r_extern;
152
  unsigned int r_type;
153
  bfd_vma r_addend;
154
  asymbol *sym = *(g->sym_ptr_ptr);
155
  asection *output_section = sym->section->output_section;
156
 
157
  PUT_WORD (abfd, g->address, natptr->r_address);
158
 
159
  r_type = (unsigned int) g->howto->type;
160
 
161
  r_addend = g->addend;
162
  if ((sym->flags & BSF_SECTION_SYM) != 0)
163
    r_addend += (*(g->sym_ptr_ptr))->section->output_section->vma;
164
 
165
  /* If this relocation is relative to a symbol then set the
166
     r_index to the symbols index, and the r_extern bit.
167
 
168
     Absolute symbols can come in in two ways, either as an offset
169
     from the abs section, or as a symbol which has an abs value.
170
     check for that here.  */
171
 
172
  if (bfd_is_abs_section (bfd_get_section (sym)))
173
    {
174
      r_extern = 0;
175
      r_index = N_ABS;
176
    }
177
  else if ((sym->flags & BSF_SECTION_SYM) == 0)
178
    {
179
      if (bfd_is_und_section (bfd_get_section (sym))
180
          /* Remember to check for weak symbols; they count as global.  */
181
          || (sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0)
182
        r_extern = 1;
183
      else
184
        r_extern = 0;
185
      r_index = (*(g->sym_ptr_ptr))->KEEPIT;
186
    }
187
  else
188
    {
189
      /* Just an ordinary section.  */
190
      r_extern = 0;
191
      r_index = output_section->target_index;
192
    }
193
 
194
  /* The relocation type is the same as the canonical ones, but only
195
     the first 3 are used: RELOC_8, RELOC_16, RELOC_32.
196
     We may change this later, but assert this for the moment.  */
197
  if (r_type > 2)
198
    {
199
      (*_bfd_error_handler) (_("%s: Invalid relocation type exported: %d"),
200
                             bfd_get_filename (abfd), r_type);
201
 
202
      bfd_set_error (bfd_error_wrong_format);
203
    }
204
 
205
  /* Now the fun stuff.  */
206
  natptr->r_index[2] = r_index >> 16;
207
  natptr->r_index[1] = r_index >> 8;
208
  natptr->r_index[0] = r_index;
209
  natptr->r_type[0] =
210
     (r_extern ? RELOC_EXT_BITS_EXTERN_LITTLE : 0)
211
      | (r_type << RELOC_EXT_BITS_TYPE_SH_LITTLE);
212
 
213
  PUT_WORD (abfd, r_addend, natptr->r_addend);
214
}
215
 
216
/* We need our own to assert that a normal 8, 16 or 32 reloc is input.  */
217
 
218
static void
219
MY (swap_ext_reloc_in) (bfd *abfd,
220
                        struct reloc_ext_external *bytes,
221
                        arelent *cache_ptr,
222
                        asymbol **symbols,
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                        bfd_size_type symcount)
224
{
225
  unsigned int r_index;
226
  int r_extern;
227
  unsigned int r_type;
228
  struct aoutdata *su = &(abfd->tdata.aout_data->a);
229
 
230
  cache_ptr->address = (GET_SWORD (abfd, bytes->r_address));
231
 
232
  /* Now the fun stuff.  */
233
  r_index =  (bytes->r_index[2] << 16)
234
    | (bytes->r_index[1] << 8)
235
    |  bytes->r_index[0];
236
  r_extern = (0 != (bytes->r_type[0] & RELOC_EXT_BITS_EXTERN_LITTLE));
237
  r_type = ((bytes->r_type[0]) >> RELOC_EXT_BITS_TYPE_SH_LITTLE)
238
    & RELOC_EXT_BITS_TYPE_LITTLE;
239
 
240
  if (r_type > 2)
241
    {
242
      (*_bfd_error_handler) (_("%B: Invalid relocation type imported: %d"),
243
                             abfd, r_type);
244
 
245
      bfd_set_error (bfd_error_wrong_format);
246
    }
247
 
248
  cache_ptr->howto =  howto_table_ext + r_type;
249
 
250
  if (r_extern && r_index > symcount)
251
    {
252
      (*_bfd_error_handler)
253
        (_("%B: Bad relocation record imported: %d"), abfd, r_index);
254
 
255
      bfd_set_error (bfd_error_wrong_format);
256
 
257
      /* We continue, so we can catch further errors.  */
258
      r_extern = 0;
259
      r_index = N_ABS;
260
    }
261
 
262
  /* Magically uses r_extern, symbols etc.  Ugly, but it's what's in the
263
     default.  */
264
  MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend));
265
}
266
 
267
/* We use the same as the default, except that we also set
268
   "obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;", to avoid changing
269
   NAME (aout, set_arch_mach) in aoutx.  */
270
 
271
static bfd_boolean
272
MY (set_sizes) (bfd *abfd)
273
{
274
  /* Just as the default in aout-target.h (with some #ifdefs folded)...  */
275
 
276
  adata (abfd).page_size = TARGET_PAGE_SIZE;
277
  adata (abfd).segment_size = SEGMENT_SIZE;
278
  adata (abfd).zmagic_disk_block_size = ZMAGIC_DISK_BLOCK_SIZE;
279
  adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;
280
 
281
  /* ... except for that we have the extended reloc.  The alternative
282
     would be to add a check on bfd_arch_cris in NAME (aout,
283
     set_arch_mach) in aoutx.h, but I don't want to do that since
284
     target-specific things should not be added there.  */
285
 
286
  obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
287
 
288
  return TRUE;
289
}

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