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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [coff-pe-read.c] - Blame information for rev 258

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Line No. Rev Author Line
1 24 jeremybenn
/* Read the export table symbols from a portable executable and
2
   convert to internal format, for GDB. Used as a last resort if no
3
   debugging symbols recognized.
4
 
5
   Copyright (C) 2003, 2007, 2008 Free Software Foundation, Inc.
6
 
7
   This file is part of GDB.
8
 
9
   This program is free software; you can redistribute it and/or modify
10
   it under the terms of the GNU General Public License as published by
11
   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
13
 
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.
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19
   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.
21
 
22
   Contributed by Raoul M. Gough (RaoulGough@yahoo.co.uk). */
23
 
24
#include "coff-pe-read.h"
25
 
26
#include "bfd.h"
27
 
28
#include "defs.h"
29
#include "gdbtypes.h"
30
 
31
#include "symtab.h"
32
#include "symfile.h"
33
#include "objfiles.h"
34
 
35
/* Internal section information */
36
 
37
struct read_pe_section_data
38
{
39
  CORE_ADDR vma_offset;         /* Offset to loaded address of section. */
40
  unsigned long rva_start;      /* Start offset within the pe. */
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  unsigned long rva_end;        /* End offset within the pe. */
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  enum minimal_symbol_type ms_type;     /* Type to assign symbols in section. */
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};
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45
#define PE_SECTION_INDEX_TEXT     0
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#define PE_SECTION_INDEX_DATA     1
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#define PE_SECTION_INDEX_BSS      2
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#define PE_SECTION_TABLE_SIZE     3
49
#define PE_SECTION_INDEX_INVALID -1
50
 
51
/* Get the index of the named section in our own array, which contains
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   text, data and bss in that order. Return PE_SECTION_INDEX_INVALID
53
   if passed an unrecognised section name. */
54
 
55
static int
56
read_pe_section_index (const char *section_name)
57
{
58
  if (strcmp (section_name, ".text") == 0)
59
    {
60
      return PE_SECTION_INDEX_TEXT;
61
    }
62
 
63
  else if (strcmp (section_name, ".data") == 0)
64
    {
65
      return PE_SECTION_INDEX_DATA;
66
    }
67
 
68
  else if (strcmp (section_name, ".bss") == 0)
69
    {
70
      return PE_SECTION_INDEX_BSS;
71
    }
72
 
73
  else
74
    {
75
      return PE_SECTION_INDEX_INVALID;
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    }
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}
78
 
79
/* Record the virtual memory address of a section. */
80
 
81
static void
82
get_section_vmas (bfd *abfd, asection *sectp, void *context)
83
{
84
  struct read_pe_section_data *sections = context;
85
  int sectix = read_pe_section_index (sectp->name);
86
 
87
  if (sectix != PE_SECTION_INDEX_INVALID)
88
    {
89
      /* Data within the section start at rva_start in the pe and at
90
         bfd_get_section_vma() within memory. Store the offset. */
91
 
92
      sections[sectix].vma_offset
93
        = bfd_get_section_vma (abfd, sectp) - sections[sectix].rva_start;
94
    }
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}
96
 
97
/* Create a minimal symbol entry for an exported symbol. */
98
 
99
static void
100
add_pe_exported_sym (char *sym_name,
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                     unsigned long func_rva,
102
                     const struct read_pe_section_data *section_data,
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                     const char *dll_name, struct objfile *objfile)
104
{
105
  /* Add the stored offset to get the loaded address of the symbol. */
106
 
107
  CORE_ADDR vma = func_rva + section_data->vma_offset;
108
 
109
  char *qualified_name = 0;
110
  int dll_name_len = strlen (dll_name);
111
  int count;
112
 
113
  /* Generate a (hopefully unique) qualified name using the first part
114
     of the dll name, e.g. KERNEL32!AddAtomA. This matches the style
115
     used by windbg from the "Microsoft Debugging Tools for Windows". */
116
 
117
  qualified_name = xmalloc (dll_name_len + strlen (sym_name) + 2);
118
 
119
  strncpy (qualified_name, dll_name, dll_name_len);
120
  qualified_name[dll_name_len] = '!';
121
  strcpy (qualified_name + dll_name_len + 1, sym_name);
122
 
123
  prim_record_minimal_symbol (qualified_name,
124
                              vma, section_data->ms_type, objfile);
125
 
126
  xfree (qualified_name);
127
 
128
  /* Enter the plain name as well, which might not be unique. */
129
  prim_record_minimal_symbol (sym_name, vma, section_data->ms_type, objfile);
130
}
131
 
132
/* Truncate a dll_name at the first dot character. */
133
 
134
static void
135
read_pe_truncate_name (char *dll_name)
136
{
137
  while (*dll_name)
138
    {
139
      if ((*dll_name) == '.')
140
        {
141
          *dll_name = '\0';     /* truncates and causes loop exit. */
142
        }
143
 
144
      else
145
        {
146
          ++dll_name;
147
        }
148
    }
149
}
150
 
151
/* Low-level support functions, direct from the ld module pe-dll.c. */
152
static unsigned int
153
pe_get16 (bfd *abfd, int where)
154
{
155
  unsigned char b[2];
156
 
157
  bfd_seek (abfd, (file_ptr) where, SEEK_SET);
158
  bfd_bread (b, (bfd_size_type) 2, abfd);
159
  return b[0] + (b[1] << 8);
160
}
161
 
162
static unsigned int
163
pe_get32 (bfd *abfd, int where)
164
{
165
  unsigned char b[4];
166
 
167
  bfd_seek (abfd, (file_ptr) where, SEEK_SET);
168
  bfd_bread (b, (bfd_size_type) 4, abfd);
169
  return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
170
}
171
 
172
static unsigned int
173
pe_as32 (void *ptr)
174
{
175
  unsigned char *b = ptr;
176
 
177
  return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
178
}
179
 
180
/* Read the (non-debug) export symbol table from a portable
181
   executable. Code originally lifted from the ld function
182
   pe_implied_import_dll in pe-dll.c. */
183
 
184
void
185
read_pe_exported_syms (struct objfile *objfile)
186
{
187
  bfd *dll = objfile->obfd;
188
  unsigned long pe_header_offset, opthdr_ofs, num_entries, i;
189
  unsigned long export_rva, export_size, nsections, secptr, expptr;
190
  unsigned long exp_funcbase;
191
  unsigned char *expdata, *erva;
192
  unsigned long name_rvas, ordinals, nexp, ordbase;
193
  char *dll_name;
194
 
195
  /* Array elements are for text, data and bss in that order
196
     Initialization with start_rva > end_rva guarantees that
197
     unused sections won't be matched. */
198
  struct read_pe_section_data section_data[PE_SECTION_TABLE_SIZE]
199
    = { {0, 1, 0, mst_text},
200
  {0, 1, 0, mst_data},
201
  {0, 1, 0, mst_bss}
202
  };
203
 
204
  struct cleanup *back_to = 0;
205
 
206
  char const *target = bfd_get_target (objfile->obfd);
207
 
208
  if ((strcmp (target, "pe-i386") != 0) && (strcmp (target, "pei-i386") != 0))
209
    {
210
      /* This is not an i386 format file. Abort now, because the code
211
         is untested on anything else. *FIXME* test on further
212
         architectures and loosen or remove this test. */
213
      return;
214
    }
215
 
216
  /* Get pe_header, optional header and numbers of export entries.  */
217
  pe_header_offset = pe_get32 (dll, 0x3c);
218
  opthdr_ofs = pe_header_offset + 4 + 20;
219
  num_entries = pe_get32 (dll, opthdr_ofs + 92);
220
 
221
  if (num_entries < 1)          /* No exports.  */
222
    {
223
      return;
224
    }
225
 
226
  export_rva = pe_get32 (dll, opthdr_ofs + 96);
227
  export_size = pe_get32 (dll, opthdr_ofs + 100);
228
  nsections = pe_get16 (dll, pe_header_offset + 4 + 2);
229
  secptr = (pe_header_offset + 4 + 20 +
230
            pe_get16 (dll, pe_header_offset + 4 + 16));
231
  expptr = 0;
232
 
233
  /* Get the rva and size of the export section.  */
234
  for (i = 0; i < nsections; i++)
235
    {
236
      char sname[8];
237
      unsigned long secptr1 = secptr + 40 * i;
238
      unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
239
      unsigned long vsize = pe_get32 (dll, secptr1 + 16);
240
      unsigned long fptr = pe_get32 (dll, secptr1 + 20);
241
 
242
      bfd_seek (dll, (file_ptr) secptr1, SEEK_SET);
243
      bfd_bread (sname, (bfd_size_type) 8, dll);
244
 
245
      if (vaddr <= export_rva && vaddr + vsize > export_rva)
246
        {
247
          expptr = fptr + (export_rva - vaddr);
248
          if (export_rva + export_size > vaddr + vsize)
249
            export_size = vsize - (export_rva - vaddr);
250
          break;
251
        }
252
    }
253
 
254
  if (export_size == 0)
255
    {
256
      /* Empty export table. */
257
      return;
258
    }
259
 
260
  /* Scan sections and store the base and size of the relevant sections. */
261
  for (i = 0; i < nsections; i++)
262
    {
263
      unsigned long secptr1 = secptr + 40 * i;
264
      unsigned long vsize = pe_get32 (dll, secptr1 + 8);
265
      unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
266
      unsigned long flags = pe_get32 (dll, secptr1 + 36);
267
      char sec_name[9];
268
      int sectix;
269
 
270
      sec_name[8] = '\0';
271
      bfd_seek (dll, (file_ptr) secptr1 + 0, SEEK_SET);
272
      bfd_bread (sec_name, (bfd_size_type) 8, dll);
273
 
274
      sectix = read_pe_section_index (sec_name);
275
 
276
      if (sectix != PE_SECTION_INDEX_INVALID)
277
        {
278
          section_data[sectix].rva_start = vaddr;
279
          section_data[sectix].rva_end = vaddr + vsize;
280
        }
281
    }
282
 
283
  expdata = (unsigned char *) xmalloc (export_size);
284
  back_to = make_cleanup (xfree, expdata);
285
 
286
  bfd_seek (dll, (file_ptr) expptr, SEEK_SET);
287
  bfd_bread (expdata, (bfd_size_type) export_size, dll);
288
  erva = expdata - export_rva;
289
 
290
  nexp = pe_as32 (expdata + 24);
291
  name_rvas = pe_as32 (expdata + 32);
292
  ordinals = pe_as32 (expdata + 36);
293
  ordbase = pe_as32 (expdata + 16);
294
  exp_funcbase = pe_as32 (expdata + 28);
295
 
296
  /* Use internal dll name instead of full pathname. */
297
  dll_name = pe_as32 (expdata + 12) + erva;
298
 
299
  bfd_map_over_sections (dll, get_section_vmas, section_data);
300
 
301
  /* Adjust the vma_offsets in case this PE got relocated. This
302
     assumes that *all* sections share the same relocation offset
303
     as the text section. */
304
  for (i = 0; i < PE_SECTION_TABLE_SIZE; i++)
305
    {
306
      section_data[i].vma_offset
307
        += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
308
    }
309
 
310
  /* Truncate name at first dot. Should maybe also convert to all
311
     lower case for convenience on Windows. */
312
  read_pe_truncate_name (dll_name);
313
 
314
  /* Iterate through the list of symbols.  */
315
  for (i = 0; i < nexp; i++)
316
    {
317
      /* Pointer to the names vector.  */
318
      unsigned long name_rva = pe_as32 (erva + name_rvas + i * 4);
319
 
320
      /* Pointer to the function address vector.  */
321
      unsigned long func_rva = pe_as32 (erva + exp_funcbase + i * 4);
322
 
323
      /* Find this symbol's section in our own array. */
324
      int sectix = 0;
325
 
326
      for (sectix = 0; sectix < PE_SECTION_TABLE_SIZE; ++sectix)
327
        {
328
          if ((func_rva >= section_data[sectix].rva_start)
329
              && (func_rva < section_data[sectix].rva_end))
330
            {
331
              add_pe_exported_sym (erva + name_rva,
332
                                   func_rva,
333
                                   section_data + sectix, dll_name, objfile);
334
              break;
335
            }
336
        }
337
    }
338
 
339
  /* discard expdata. */
340
  do_cleanups (back_to);
341
}

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