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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [auxv.c] - Blame information for rev 227

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1 227 jeremybenn
/* Auxiliary vector support for GDB, the GNU debugger.
2
 
3
   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
4
   Free Software Foundation, Inc.
5
 
6
   This file is part of GDB.
7
 
8
   This program is free software; you can redistribute it and/or modify
9
   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 3 of the License, or
11
   (at your option) any later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
 
21
#include "defs.h"
22
#include "target.h"
23
#include "gdbtypes.h"
24
#include "command.h"
25
#include "inferior.h"
26
#include "valprint.h"
27
#include "gdb_assert.h"
28
#include "gdbcore.h"
29
 
30
#include "auxv.h"
31
#include "elf/common.h"
32
 
33
#include <unistd.h>
34
#include <fcntl.h>
35
 
36
 
37
/* This function handles access via /proc/PID/auxv, which is a common method
38
   for native targets.  */
39
 
40
static LONGEST
41
procfs_xfer_auxv (gdb_byte *readbuf,
42
                  const gdb_byte *writebuf,
43
                  ULONGEST offset,
44
                  LONGEST len)
45
{
46
  char *pathname;
47
  int fd;
48
  LONGEST n;
49
 
50
  pathname = xstrprintf ("/proc/%d/auxv", PIDGET (inferior_ptid));
51
  fd = open (pathname, writebuf != NULL ? O_WRONLY : O_RDONLY);
52
  xfree (pathname);
53
  if (fd < 0)
54
    return -1;
55
 
56
  if (offset != (ULONGEST) 0
57
      && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
58
    n = -1;
59
  else if (readbuf != NULL)
60
    n = read (fd, readbuf, len);
61
  else
62
    n = write (fd, writebuf, len);
63
 
64
  (void) close (fd);
65
 
66
  return n;
67
}
68
 
69
/* This function handles access via ld.so's symbol `_dl_auxv'.  */
70
 
71
static LONGEST
72
ld_so_xfer_auxv (gdb_byte *readbuf,
73
                 const gdb_byte *writebuf,
74
                 ULONGEST offset,
75
                 LONGEST len)
76
{
77
  struct minimal_symbol *msym;
78
  CORE_ADDR data_address, pointer_address;
79
  struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
80
  size_t ptr_size = TYPE_LENGTH (ptr_type);
81
  size_t auxv_pair_size = 2 * ptr_size;
82
  gdb_byte *ptr_buf = alloca (ptr_size);
83
  LONGEST retval;
84
  size_t block;
85
 
86
  msym = lookup_minimal_symbol ("_dl_auxv", NULL, NULL);
87
  if (msym == NULL)
88
    return -1;
89
 
90
  if (MSYMBOL_SIZE (msym) != ptr_size)
91
    return -1;
92
 
93
  /* POINTER_ADDRESS is a location where the `_dl_auxv' variable resides.
94
     DATA_ADDRESS is the inferior value present in `_dl_auxv', therefore the
95
     real inferior AUXV address.  */
96
 
97
  pointer_address = SYMBOL_VALUE_ADDRESS (msym);
98
 
99
  data_address = read_memory_typed_address (pointer_address, ptr_type);
100
 
101
  /* Possibly still not initialized such as during an inferior startup.  */
102
  if (data_address == 0)
103
    return -1;
104
 
105
  data_address += offset;
106
 
107
  if (writebuf != NULL)
108
    {
109
      if (target_write_memory (data_address, writebuf, len) == 0)
110
        return len;
111
      else
112
        return -1;
113
    }
114
 
115
  /* Stop if trying to read past the existing AUXV block.  The final AT_NULL
116
     was already returned before.  */
117
 
118
  if (offset >= auxv_pair_size)
119
    {
120
      if (target_read_memory (data_address - auxv_pair_size, ptr_buf,
121
                              ptr_size) != 0)
122
        return -1;
123
 
124
      if (extract_typed_address (ptr_buf, ptr_type) == AT_NULL)
125
        return 0;
126
    }
127
 
128
  retval = 0;
129
  block = 0x400;
130
  gdb_assert (block % auxv_pair_size == 0);
131
 
132
  while (len > 0)
133
    {
134
      if (block > len)
135
        block = len;
136
 
137
      /* Reading sizes smaller than AUXV_PAIR_SIZE is not supported.  Tails
138
         unaligned to AUXV_PAIR_SIZE will not be read during a call (they
139
         should be completed during next read with new/extended buffer).  */
140
 
141
      block &= -auxv_pair_size;
142
      if (block == 0)
143
        return retval;
144
 
145
      if (target_read_memory (data_address, readbuf, block) != 0)
146
        {
147
          if (block <= auxv_pair_size)
148
            return retval;
149
 
150
          block = auxv_pair_size;
151
          continue;
152
        }
153
 
154
      data_address += block;
155
      len -= block;
156
 
157
      /* Check terminal AT_NULL.  This function is being called indefinitely
158
         being extended its READBUF until it returns EOF (0).  */
159
 
160
      while (block >= auxv_pair_size)
161
        {
162
          retval += auxv_pair_size;
163
 
164
          if (extract_typed_address (readbuf, ptr_type) == AT_NULL)
165
            return retval;
166
 
167
          readbuf += auxv_pair_size;
168
          block -= auxv_pair_size;
169
        }
170
    }
171
 
172
  return retval;
173
}
174
 
175
/* This function is called like a to_xfer_partial hook, but must be
176
   called with TARGET_OBJECT_AUXV.  It handles access to AUXV.  */
177
 
178
LONGEST
179
memory_xfer_auxv (struct target_ops *ops,
180
                  enum target_object object,
181
                  const char *annex,
182
                  gdb_byte *readbuf,
183
                  const gdb_byte *writebuf,
184
                  ULONGEST offset,
185
                  LONGEST len)
186
{
187
  gdb_assert (object == TARGET_OBJECT_AUXV);
188
  gdb_assert (readbuf || writebuf);
189
 
190
   /* ld_so_xfer_auxv is the only function safe for virtual executables being
191
      executed by valgrind's memcheck.  As using ld_so_xfer_auxv is problematic
192
      during inferior startup GDB does call it only for attached processes.  */
193
 
194
  if (current_inferior ()->attach_flag != 0)
195
    {
196
      LONGEST retval;
197
 
198
      retval = ld_so_xfer_auxv (readbuf, writebuf, offset, len);
199
      if (retval != -1)
200
        return retval;
201
    }
202
 
203
  return procfs_xfer_auxv (readbuf, writebuf, offset, len);
204
}
205
 
206
/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
207
   Return 0 if *READPTR is already at the end of the buffer.
208
   Return -1 if there is insufficient buffer for a whole entry.
209
   Return 1 if an entry was read into *TYPEP and *VALP.  */
210
static int
211
default_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
212
                   gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
213
{
214
  const int sizeof_auxv_field = gdbarch_ptr_bit (target_gdbarch)
215
                                / TARGET_CHAR_BIT;
216
  const enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
217
  gdb_byte *ptr = *readptr;
218
 
219
  if (endptr == ptr)
220
    return 0;
221
 
222
  if (endptr - ptr < sizeof_auxv_field * 2)
223
    return -1;
224
 
225
  *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
226
  ptr += sizeof_auxv_field;
227
  *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
228
  ptr += sizeof_auxv_field;
229
 
230
  *readptr = ptr;
231
  return 1;
232
}
233
 
234
/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
235
   Return 0 if *READPTR is already at the end of the buffer.
236
   Return -1 if there is insufficient buffer for a whole entry.
237
   Return 1 if an entry was read into *TYPEP and *VALP.  */
238
int
239
target_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
240
                  gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
241
{
242
  struct target_ops *t;
243
  for (t = ops; t != NULL; t = t->beneath)
244
    if (t->to_auxv_parse != NULL)
245
      return t->to_auxv_parse (t, readptr, endptr, typep, valp);
246
 
247
  return default_auxv_parse (ops, readptr, endptr, typep, valp);
248
}
249
 
250
/* Extract the auxiliary vector entry with a_type matching MATCH.
251
   Return zero if no such entry was found, or -1 if there was
252
   an error getting the information.  On success, return 1 after
253
   storing the entry's value field in *VALP.  */
254
int
255
target_auxv_search (struct target_ops *ops, CORE_ADDR match, CORE_ADDR *valp)
256
{
257
  CORE_ADDR type, val;
258
  gdb_byte *data;
259
  LONGEST n = target_read_alloc (ops, TARGET_OBJECT_AUXV, NULL, &data);
260
  gdb_byte *ptr = data;
261
  int ents = 0;
262
 
263
  if (n <= 0)
264
    return n;
265
 
266
  while (1)
267
    switch (target_auxv_parse (ops, &ptr, data + n, &type, &val))
268
      {
269
      case 1:                   /* Here's an entry, check it.  */
270
        if (type == match)
271
          {
272
            xfree (data);
273
            *valp = val;
274
            return 1;
275
          }
276
        break;
277
      case 0:                    /* End of the vector.  */
278
        xfree (data);
279
        return 0;
280
      default:                  /* Bogosity.  */
281
        xfree (data);
282
        return -1;
283
      }
284
 
285
  /*NOTREACHED*/
286
}
287
 
288
 
289
/* Print the contents of the target's AUXV on the specified file. */
290
int
291
fprint_target_auxv (struct ui_file *file, struct target_ops *ops)
292
{
293
  CORE_ADDR type, val;
294
  gdb_byte *data;
295
  LONGEST len = target_read_alloc (ops, TARGET_OBJECT_AUXV, NULL,
296
                                   &data);
297
  gdb_byte *ptr = data;
298
  int ents = 0;
299
 
300
  if (len <= 0)
301
    return len;
302
 
303
  while (target_auxv_parse (ops, &ptr, data + len, &type, &val) > 0)
304
    {
305
      const char *name = "???";
306
      const char *description = "";
307
      enum { dec, hex, str } flavor = hex;
308
 
309
      switch (type)
310
        {
311
#define TAG(tag, text, kind) \
312
        case tag: name = #tag; description = text; flavor = kind; break
313
          TAG (AT_NULL, _("End of vector"), hex);
314
          TAG (AT_IGNORE, _("Entry should be ignored"), hex);
315
          TAG (AT_EXECFD, _("File descriptor of program"), dec);
316
          TAG (AT_PHDR, _("Program headers for program"), hex);
317
          TAG (AT_PHENT, _("Size of program header entry"), dec);
318
          TAG (AT_PHNUM, _("Number of program headers"), dec);
319
          TAG (AT_PAGESZ, _("System page size"), dec);
320
          TAG (AT_BASE, _("Base address of interpreter"), hex);
321
          TAG (AT_FLAGS, _("Flags"), hex);
322
          TAG (AT_ENTRY, _("Entry point of program"), hex);
323
          TAG (AT_NOTELF, _("Program is not ELF"), dec);
324
          TAG (AT_UID, _("Real user ID"), dec);
325
          TAG (AT_EUID, _("Effective user ID"), dec);
326
          TAG (AT_GID, _("Real group ID"), dec);
327
          TAG (AT_EGID, _("Effective group ID"), dec);
328
          TAG (AT_CLKTCK, _("Frequency of times()"), dec);
329
          TAG (AT_PLATFORM, _("String identifying platform"), str);
330
          TAG (AT_HWCAP, _("Machine-dependent CPU capability hints"), hex);
331
          TAG (AT_FPUCW, _("Used FPU control word"), dec);
332
          TAG (AT_DCACHEBSIZE, _("Data cache block size"), dec);
333
          TAG (AT_ICACHEBSIZE, _("Instruction cache block size"), dec);
334
          TAG (AT_UCACHEBSIZE, _("Unified cache block size"), dec);
335
          TAG (AT_IGNOREPPC, _("Entry should be ignored"), dec);
336
          TAG (AT_BASE_PLATFORM, _("String identifying base platform"), str);
337
          TAG (AT_RANDOM, _("Address of 16 random bytes"), hex);
338
          TAG (AT_EXECFN, _("File name of executable"), str);
339
          TAG (AT_SECURE, _("Boolean, was exec setuid-like?"), dec);
340
          TAG (AT_SYSINFO, _("Special system info/entry points"), hex);
341
          TAG (AT_SYSINFO_EHDR, _("System-supplied DSO's ELF header"), hex);
342
          TAG (AT_SUN_UID, _("Effective user ID"), dec);
343
          TAG (AT_SUN_RUID, _("Real user ID"), dec);
344
          TAG (AT_SUN_GID, _("Effective group ID"), dec);
345
          TAG (AT_SUN_RGID, _("Real group ID"), dec);
346
          TAG (AT_SUN_LDELF, _("Dynamic linker's ELF header"), hex);
347
          TAG (AT_SUN_LDSHDR, _("Dynamic linker's section headers"), hex);
348
          TAG (AT_SUN_LDNAME, _("String giving name of dynamic linker"), str);
349
          TAG (AT_SUN_LPAGESZ, _("Large pagesize"), dec);
350
          TAG (AT_SUN_PLATFORM, _("Platform name string"), str);
351
          TAG (AT_SUN_HWCAP, _("Machine-dependent CPU capability hints"), hex);
352
          TAG (AT_SUN_IFLUSH, _("Should flush icache?"), dec);
353
          TAG (AT_SUN_CPU, _("CPU name string"), str);
354
          TAG (AT_SUN_EMUL_ENTRY, _("COFF entry point address"), hex);
355
          TAG (AT_SUN_EMUL_EXECFD, _("COFF executable file descriptor"), dec);
356
          TAG (AT_SUN_EXECNAME,
357
               _("Canonicalized file name given to execve"), str);
358
          TAG (AT_SUN_MMU, _("String for name of MMU module"), str);
359
          TAG (AT_SUN_LDDATA, _("Dynamic linker's data segment address"), hex);
360
          TAG (AT_SUN_AUXFLAGS,
361
               _("AF_SUN_ flags passed from the kernel"), hex);
362
        }
363
 
364
      fprintf_filtered (file, "%-4s %-20s %-30s ",
365
                        plongest (type), name, description);
366
      switch (flavor)
367
        {
368
        case dec:
369
          fprintf_filtered (file, "%s\n", plongest (val));
370
          break;
371
        case hex:
372
          fprintf_filtered (file, "%s\n", paddress (target_gdbarch, val));
373
          break;
374
        case str:
375
          {
376
            struct value_print_options opts;
377
            get_user_print_options (&opts);
378
            if (opts.addressprint)
379
              fprintf_filtered (file, "%s", paddress (target_gdbarch, val));
380
            val_print_string (builtin_type (target_gdbarch)->builtin_char,
381
                              val, -1, file, &opts);
382
            fprintf_filtered (file, "\n");
383
          }
384
          break;
385
        }
386
      ++ents;
387
      if (type == AT_NULL)
388
        break;
389
    }
390
 
391
  xfree (data);
392
 
393
  return ents;
394
}
395
 
396
static void
397
info_auxv_command (char *cmd, int from_tty)
398
{
399
  if (! target_has_stack)
400
    error (_("The program has no auxiliary information now."));
401
  else
402
    {
403
      int ents = fprint_target_auxv (gdb_stdout, &current_target);
404
      if (ents < 0)
405
        error (_("No auxiliary vector found, or failed reading it."));
406
      else if (ents == 0)
407
        error (_("Auxiliary vector is empty."));
408
    }
409
}
410
 
411
 
412
extern initialize_file_ftype _initialize_auxv; /* -Wmissing-prototypes; */
413
 
414
void
415
_initialize_auxv (void)
416
{
417
  add_info ("auxv", info_auxv_command,
418
            _("Display the inferior's auxiliary vector.\n\
419
This is information provided by the operating system at program startup."));
420
}

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