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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [nto-tdep.c] - Blame information for rev 233

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1 24 jeremybenn
/* nto-tdep.c - general QNX Neutrino target functionality.
2
 
3
   Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
4
 
5
   Contributed by QNX Software Systems Ltd.
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
12
   (at your option) any later version.
13
 
14
   This program is distributed in the hope that it will be useful,
15
   but WITHOUT ANY WARRANTY; without even the implied warranty of
16
   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
20
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
21
 
22
#include "defs.h"
23
#include "gdb_stat.h"
24
#include "gdb_string.h"
25
#include "nto-tdep.h"
26
#include "top.h"
27
#include "cli/cli-decode.h"
28
#include "cli/cli-cmds.h"
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#include "inferior.h"
30
#include "gdbarch.h"
31
#include "bfd.h"
32
#include "elf-bfd.h"
33
#include "solib-svr4.h"
34
#include "gdbcore.h"
35
#include "objfiles.h"
36
 
37
#include <string.h>
38
 
39
#ifdef __CYGWIN__
40
#include <sys/cygwin.h>
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#endif
42
 
43
#ifdef __CYGWIN__
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static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";
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#elif defined(__sun__) || defined(linux)
46
static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";
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#else
48
static char default_nto_target[] = "";
49
#endif
50
 
51
struct nto_target_ops current_nto_target;
52
 
53
static char *
54
nto_target (void)
55
{
56
  char *p = getenv ("QNX_TARGET");
57
 
58
#ifdef __CYGWIN__
59
  static char buf[PATH_MAX];
60
  if (p)
61
    cygwin_conv_to_posix_path (p, buf);
62
  else
63
    cygwin_conv_to_posix_path (default_nto_target, buf);
64
  return buf;
65
#else
66
  return p ? p : default_nto_target;
67
#endif
68
}
69
 
70
void
71
nto_set_target (struct nto_target_ops *targ)
72
{
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  nto_regset_id = targ->regset_id;
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  nto_supply_gregset = targ->supply_gregset;
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  nto_supply_fpregset = targ->supply_fpregset;
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  nto_supply_altregset = targ->supply_altregset;
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  nto_supply_regset = targ->supply_regset;
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  nto_register_area = targ->register_area;
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  nto_regset_fill = targ->regset_fill;
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  nto_fetch_link_map_offsets = targ->fetch_link_map_offsets;
81
}
82
 
83
/* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
84
   CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
85
int
86
nto_map_arch_to_cputype (const char *arch)
87
{
88
  if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
89
    return CPUTYPE_X86;
90
  if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))
91
    return CPUTYPE_PPC;
92
  if (!strcmp (arch, "mips"))
93
    return CPUTYPE_MIPS;
94
  if (!strcmp (arch, "arm"))
95
    return CPUTYPE_ARM;
96
  if (!strcmp (arch, "sh"))
97
    return CPUTYPE_SH;
98
  return CPUTYPE_UNKNOWN;
99
}
100
 
101
int
102
nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname)
103
{
104
  char *buf, *arch_path, *nto_root, *endian, *base;
105
  const char *arch;
106
  int ret;
107
#define PATH_FMT "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"
108
 
109
  nto_root = nto_target ();
110
  if (strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name, "i386") == 0)
111
    {
112
      arch = "x86";
113
      endian = "";
114
    }
115
  else if (strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
116
                   "rs6000") == 0
117
           || strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
118
                   "powerpc") == 0)
119
    {
120
      arch = "ppc";
121
      endian = "be";
122
    }
123
  else
124
    {
125
      arch = gdbarch_bfd_arch_info (current_gdbarch)->arch_name;
126
      endian = gdbarch_byte_order (current_gdbarch)
127
               == BFD_ENDIAN_BIG ? "be" : "le";
128
    }
129
 
130
  /* In case nto_root is short, add strlen(solib)
131
     so we can reuse arch_path below.  */
132
  arch_path =
133
    alloca (strlen (nto_root) + strlen (arch) + strlen (endian) + 2 +
134
            strlen (solib));
135
  sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
136
 
137
  buf = alloca (strlen (PATH_FMT) + strlen (arch_path) * 5 + 1);
138
  sprintf (buf, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
139
           arch_path);
140
 
141
  /* Don't assume basename() isn't destructive.  */
142
  base = strrchr (solib, '/');
143
  if (!base)
144
    base = solib;
145
  else
146
    base++;                     /* Skip over '/'.  */
147
 
148
  ret = openp (buf, 1, base, o_flags, 0, temp_pathname);
149
  if (ret < 0 && base != solib)
150
    {
151
      sprintf (arch_path, "/%s", solib);
152
      ret = open (arch_path, o_flags, 0);
153
      if (temp_pathname)
154
        {
155
          if (ret >= 0)
156
            *temp_pathname = gdb_realpath (arch_path);
157
          else
158
            **temp_pathname = '\0';
159
        }
160
    }
161
  return ret;
162
}
163
 
164
void
165
nto_init_solib_absolute_prefix (void)
166
{
167
  char buf[PATH_MAX * 2], arch_path[PATH_MAX];
168
  char *nto_root, *endian;
169
  const char *arch;
170
 
171
  nto_root = nto_target ();
172
  if (strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name, "i386") == 0)
173
    {
174
      arch = "x86";
175
      endian = "";
176
    }
177
  else if (strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
178
                   "rs6000") == 0
179
           || strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
180
                   "powerpc") == 0)
181
    {
182
      arch = "ppc";
183
      endian = "be";
184
    }
185
  else
186
    {
187
      arch = gdbarch_bfd_arch_info (current_gdbarch)->arch_name;
188
      endian = gdbarch_byte_order (current_gdbarch)
189
               == BFD_ENDIAN_BIG ? "be" : "le";
190
    }
191
 
192
  sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
193
 
194
  sprintf (buf, "set solib-absolute-prefix %s", arch_path);
195
  execute_command (buf, 0);
196
}
197
 
198
char **
199
nto_parse_redirection (char *pargv[], char **pin, char **pout, char **perr)
200
{
201
  char **argv;
202
  char *in, *out, *err, *p;
203
  int argc, i, n;
204
 
205
  for (n = 0; pargv[n]; n++);
206
  if (n == 0)
207
    return NULL;
208
  in = "";
209
  out = "";
210
  err = "";
211
 
212
  argv = xcalloc (n + 1, sizeof argv[0]);
213
  argc = n;
214
  for (i = 0, n = 0; n < argc; n++)
215
    {
216
      p = pargv[n];
217
      if (*p == '>')
218
        {
219
          p++;
220
          if (*p)
221
            out = p;
222
          else
223
            out = pargv[++n];
224
        }
225
      else if (*p == '<')
226
        {
227
          p++;
228
          if (*p)
229
            in = p;
230
          else
231
            in = pargv[++n];
232
        }
233
      else if (*p++ == '2' && *p++ == '>')
234
        {
235
          if (*p == '&' && *(p + 1) == '1')
236
            err = out;
237
          else if (*p)
238
            err = p;
239
          else
240
            err = pargv[++n];
241
        }
242
      else
243
        argv[i++] = pargv[n];
244
    }
245
  *pin = in;
246
  *pout = out;
247
  *perr = err;
248
  return argv;
249
}
250
 
251
/* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from
252
   solib-svr4.c to support nto_relocate_section_addresses
253
   which is different from the svr4 version.  */
254
 
255
struct lm_info
256
{
257
  /* Pointer to copy of link map from inferior.  The type is char *
258
     rather than void *, so that we may use byte offsets to find the
259
     various fields without the need for a cast.  */
260
  char *lm;
261
};
262
 
263
static CORE_ADDR
264
LM_ADDR (struct so_list *so)
265
{
266
  struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
267
 
268
  return extract_typed_address (so->lm_info->lm + lmo->l_addr_offset,
269
                                builtin_type_void_data_ptr);
270
}
271
 
272
static CORE_ADDR
273
nto_truncate_ptr (CORE_ADDR addr)
274
{
275
  if (gdbarch_ptr_bit (current_gdbarch) == sizeof (CORE_ADDR) * 8)
276
    /* We don't need to truncate anything, and the bit twiddling below
277
       will fail due to overflow problems.  */
278
    return addr;
279
  else
280
    return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (current_gdbarch)) - 1);
281
}
282
 
283
Elf_Internal_Phdr *
284
find_load_phdr (bfd *abfd)
285
{
286
  Elf_Internal_Phdr *phdr;
287
  unsigned int i;
288
 
289
  if (!elf_tdata (abfd))
290
    return NULL;
291
 
292
  phdr = elf_tdata (abfd)->phdr;
293
  for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
294
    {
295
      if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
296
        return phdr;
297
    }
298
  return NULL;
299
}
300
 
301
void
302
nto_relocate_section_addresses (struct so_list *so, struct section_table *sec)
303
{
304
  /* Neutrino treats the l_addr base address field in link.h as different than
305
     the base address in the System V ABI and so the offset needs to be
306
     calculated and applied to relocations.  */
307
  Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);
308
  unsigned vaddr = phdr ? phdr->p_vaddr : 0;
309
 
310
  sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);
311
  sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);
312
}
313
 
314
/* This is cheating a bit because our linker code is in libc.so.  If we
315
   ever implement lazy linking, this may need to be re-examined.  */
316
int
317
nto_in_dynsym_resolve_code (CORE_ADDR pc)
318
{
319
  if (in_plt_section (pc, NULL))
320
    return 1;
321
  return 0;
322
}
323
 
324
void
325
nto_generic_supply_gpregset (const struct regset *regset,
326
                             struct regcache *regcache, int regnum,
327
                             const void *gregs, size_t len)
328
{
329
}
330
 
331
void
332
nto_generic_supply_fpregset (const struct regset *regset,
333
                             struct regcache *regcache, int regnum,
334
                             const void *fpregs, size_t len)
335
{
336
}
337
 
338
void
339
nto_generic_supply_altregset (const struct regset *regset,
340
                              struct regcache *regcache, int regnum,
341
                              const void *altregs, size_t len)
342
{
343
}
344
 
345
void
346
nto_dummy_supply_regset (struct regcache *regcache, char *regs)
347
{
348
  /* Do nothing.  */
349
}
350
 
351
enum gdb_osabi
352
nto_elf_osabi_sniffer (bfd *abfd)
353
{
354
  if (nto_is_nto_target)
355
    return nto_is_nto_target (abfd);
356
  return GDB_OSABI_UNKNOWN;
357
}
358
 
359
void
360
nto_initialize_signals (void)
361
{
362
  /* We use SIG45 for pulses, or something, so nostop, noprint
363
     and pass them.  */
364
  signal_stop_update (target_signal_from_name ("SIG45"), 0);
365
  signal_print_update (target_signal_from_name ("SIG45"), 0);
366
  signal_pass_update (target_signal_from_name ("SIG45"), 1);
367
 
368
  /* By default we don't want to stop on these two, but we do want to pass.  */
369
#if defined(SIGSELECT)
370
  signal_stop_update (SIGSELECT, 0);
371
  signal_print_update (SIGSELECT, 0);
372
  signal_pass_update (SIGSELECT, 1);
373
#endif
374
 
375
#if defined(SIGPHOTON)
376
  signal_stop_update (SIGPHOTON, 0);
377
  signal_print_update (SIGPHOTON, 0);
378
  signal_pass_update (SIGPHOTON, 1);
379
#endif
380
}
381
 
382
void
383
_initialize_nto_tdep (void)
384
{
385
  add_setshow_zinteger_cmd ("nto-debug", class_maintenance,
386
                            &nto_internal_debugging, _("\
387
Set QNX NTO internal debugging."), _("\
388
Show QNX NTO internal debugging."), _("\
389
When non-zero, nto specific debug info is\n\
390
displayed. Different information is displayed\n\
391
for different positive values."),
392
                            NULL,
393
                            NULL, /* FIXME: i18n: QNX NTO internal debugging is %s.  */
394
                            &setdebuglist, &showdebuglist);
395
}

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