gdb/nto-tdep.c

   1 /* nto-tdep.c - general QNX Neutrino target functionality.
   2
   3    Copyright (C) 2003, 2004, 2007 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 2 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
  17    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, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #include "gdb_stat.h"
  25 #include "gdb_string.h"
  26 #include "nto-tdep.h"
  27 #include "top.h"
  28 #include "cli/cli-decode.h"
  29 #include "cli/cli-cmds.h"
  30 #include "inferior.h"
  31 #include "gdbarch.h"
  32 #include "bfd.h"
  33 #include "elf-bfd.h"
  34 #include "solib-svr4.h"
  35 #include "gdbcore.h"
  36 #include "objfiles.h"
  37
  38 #include <string.h>
  39
  40 #ifdef __CYGWIN__
  41 #include <sys/cygwin.h>
  42 #endif
  43
  44 #ifdef __CYGWIN__
  45 static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";
  46 #elif defined(__sun__) || defined(linux)
  47 static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";
  48 #else
  49 static char default_nto_target[] = "";
  50 #endif
  51
  52 struct nto_target_ops current_nto_target;
  53
  54 static char *
  55 nto_target (void)
  56 {
  57   char *p = getenv ("QNX_TARGET");
  58
  59 #ifdef __CYGWIN__
  60   static char buf[PATH_MAX];
  61   if (p)
  62     cygwin_conv_to_posix_path (p, buf);
  63   else
  64     cygwin_conv_to_posix_path (default_nto_target, buf);
  65   return buf;
  66 #else
  67   return p ? p : default_nto_target;
  68 #endif
  69 }
  70
  71 void
  72 nto_set_target (struct nto_target_ops *targ)
  73 {
  74   nto_regset_id = targ->regset_id;
  75   nto_supply_gregset = targ->supply_gregset;
  76   nto_supply_fpregset = targ->supply_fpregset;
  77   nto_supply_altregset = targ->supply_altregset;
  78   nto_supply_regset = targ->supply_regset;
  79   nto_register_area = targ->register_area;
  80   nto_regset_fill = targ->regset_fill;
  81   nto_fetch_link_map_offsets = targ->fetch_link_map_offsets;
  82 }
  83
  84 /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
  85    CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
  86 int
  87 nto_map_arch_to_cputype (const char *arch)
  88 {
  89   if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
  90     return CPUTYPE_X86;
  91   if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))
  92     return CPUTYPE_PPC;
  93   if (!strcmp (arch, "mips"))
  94     return CPUTYPE_MIPS;
  95   if (!strcmp (arch, "arm"))
  96     return CPUTYPE_ARM;
  97   if (!strcmp (arch, "sh"))
  98     return CPUTYPE_SH;
  99   return CPUTYPE_UNKNOWN;
 100 }
 101
 102 int
 103 nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname)
 104 {
 105   char *buf, *arch_path, *nto_root, *endian, *base;
 106   const char *arch;
 107   int ret;
 108 #define PATH_FMT "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"
 109
 110   nto_root = nto_target ();
 111   if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
 112     {
 113       arch = "x86";
 114       endian = "";
 115     }
 116   else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0
 117            || strcmp (TARGET_ARCHITECTURE->arch_name, "powerpc") == 0)
 118     {
 119       arch = "ppc";
 120       endian = "be";
 121     }
 122   else
 123     {
 124       arch = TARGET_ARCHITECTURE->arch_name;
 125       endian = gdbarch_byte_order (current_gdbarch)
 126                == BFD_ENDIAN_BIG ? "be" : "le";
 127     }
 128
 129   /* In case nto_root is short, add strlen(solib)
 130      so we can reuse arch_path below.  */
 131   arch_path =
 132     alloca (strlen (nto_root) + strlen (arch) + strlen (endian) + 2 +
 133             strlen (solib));
 134   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 135
 136   buf = alloca (strlen (PATH_FMT) + strlen (arch_path) * 5 + 1);
 137   sprintf (buf, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
 138            arch_path);
 139
 140   /* Don't assume basename() isn't destructive.  */
 141   base = strrchr (solib, '/');
 142   if (!base)
 143     base = solib;
 144   else
 145     base++;                     /* Skip over '/'.  */
 146
 147   ret = openp (buf, 1, base, o_flags, 0, temp_pathname);
 148   if (ret < 0 && base != solib)
 149     {
 150       sprintf (arch_path, "/%s", solib);
 151       ret = open (arch_path, o_flags, 0);
 152       if (temp_pathname)
 153         {
 154           if (ret >= 0)
 155             *temp_pathname = gdb_realpath (arch_path);
 156           else
 157             **temp_pathname = '\0';
 158         }
 159     }
 160   return ret;
 161 }
 162
 163 void
 164 nto_init_solib_absolute_prefix (void)
 165 {
 166   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 167   char *nto_root, *endian;
 168   const char *arch;
 169
 170   nto_root = nto_target ();
 171   if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
 172     {
 173       arch = "x86";
 174       endian = "";
 175     }
 176   else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0
 177            || strcmp (TARGET_ARCHITECTURE->arch_name, "powerpc") == 0)
 178     {
 179       arch = "ppc";
 180       endian = "be";
 181     }
 182   else
 183     {
 184       arch = TARGET_ARCHITECTURE->arch_name;
 185       endian = gdbarch_byte_order (current_gdbarch)
 186                == BFD_ENDIAN_BIG ? "be" : "le";
 187     }
 188
 189   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 190
 191   sprintf (buf, "set solib-absolute-prefix %s", arch_path);
 192   execute_command (buf, 0);
 193 }
 194
 195 char **
 196 nto_parse_redirection (char *pargv[], char **pin, char **pout, char **perr)
 197 {
 198   char **argv;
 199   char *in, *out, *err, *p;
 200   int argc, i, n;
 201
 202   for (n = 0; pargv[n]; n++);
 203   if (n == 0)
 204     return NULL;
 205   in = "";
 206   out = "";
 207   err = "";
 208
 209   argv = xcalloc (n + 1, sizeof argv[0]);
 210   argc = n;
 211   for (i = 0, n = 0; n < argc; n++)
 212     {
 213       p = pargv[n];
 214       if (*p == '>')
 215         {
 216           p++;
 217           if (*p)
 218             out = p;
 219           else
 220             out = pargv[++n];
 221         }
 222       else if (*p == '<')
 223         {
 224           p++;
 225           if (*p)
 226             in = p;
 227           else
 228             in = pargv[++n];
 229         }
 230       else if (*p++ == '2' && *p++ == '>')
 231         {
 232           if (*p == '&' && *(p + 1) == '1')
 233             err = out;
 234           else if (*p)
 235             err = p;
 236           else
 237             err = pargv[++n];
 238         }
 239       else
 240         argv[i++] = pargv[n];
 241     }
 242   *pin = in;
 243   *pout = out;
 244   *perr = err;
 245   return argv;
 246 }
 247
 248 /* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from
 249    solib-svr4.c to support nto_relocate_section_addresses
 250    which is different from the svr4 version.  */
 251
 252 struct lm_info
 253 {
 254   /* Pointer to copy of link map from inferior.  The type is char *
 255      rather than void *, so that we may use byte offsets to find the
 256      various fields without the need for a cast.  */
 257   char *lm;
 258 };
 259
 260 static CORE_ADDR
 261 LM_ADDR (struct so_list *so)
 262 {
 263   struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
 264
 265   return (CORE_ADDR) extract_signed_integer (so->lm_info->lm +
 266                                              lmo->l_addr_offset,
 267                                              lmo->l_addr_size);
 268 }
 269
 270 static CORE_ADDR
 271 nto_truncate_ptr (CORE_ADDR addr)
 272 {
 273   if (TARGET_PTR_BIT == sizeof (CORE_ADDR) * 8)
 274     /* We don't need to truncate anything, and the bit twiddling below
 275        will fail due to overflow problems.  */
 276     return addr;
 277   else
 278     return addr & (((CORE_ADDR) 1 << TARGET_PTR_BIT) - 1);
 279 }
 280
 281 Elf_Internal_Phdr *
 282 find_load_phdr (bfd *abfd)
 283 {
 284   Elf_Internal_Phdr *phdr;
 285   unsigned int i;
 286
 287   if (!elf_tdata (abfd))
 288     return NULL;
 289
 290   phdr = elf_tdata (abfd)->phdr;
 291   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 292     {
 293       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 294         return phdr;
 295     }
 296   return NULL;
 297 }
 298
 299 void
 300 nto_relocate_section_addresses (struct so_list *so, struct section_table *sec)
 301 {
 302   /* Neutrino treats the l_addr base address field in link.h as different than
 303      the base address in the System V ABI and so the offset needs to be
 304      calculated and applied to relocations.  */
 305   Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);
 306   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 307
 308   sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);
 309   sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);
 310 }
 311
 312 /* This is cheating a bit because our linker code is in libc.so.  If we
 313    ever implement lazy linking, this may need to be re-examined.  */
 314 int
 315 nto_in_dynsym_resolve_code (CORE_ADDR pc)
 316 {
 317   if (in_plt_section (pc, NULL))
 318     return 1;
 319   return 0;
 320 }
 321
 322 void
 323 nto_generic_supply_gpregset (const struct regset *regset,
 324                              struct regcache *regcache, int regnum,
 325                              const void *gregs, size_t len)
 326 {
 327 }
 328
 329 void
 330 nto_generic_supply_fpregset (const struct regset *regset,
 331                              struct regcache *regcache, int regnum,
 332                              const void *fpregs, size_t len)
 333 {
 334 }
 335
 336 void
 337 nto_generic_supply_altregset (const struct regset *regset,
 338                               struct regcache *regcache, int regnum,
 339                               const void *altregs, size_t len)
 340 {
 341 }
 342
 343 void
 344 nto_dummy_supply_regset (struct regcache *regcache, char *regs)
 345 {
 346   /* Do nothing.  */
 347 }
 348
 349 enum gdb_osabi
 350 nto_elf_osabi_sniffer (bfd *abfd)
 351 {
 352   if (nto_is_nto_target)
 353     return nto_is_nto_target (abfd);
 354   return GDB_OSABI_UNKNOWN;
 355 }
 356
 357 void
 358 nto_initialize_signals (void)
 359 {
 360   /* We use SIG45 for pulses, or something, so nostop, noprint
 361      and pass them.  */
 362   signal_stop_update (target_signal_from_name ("SIG45"), 0);
 363   signal_print_update (target_signal_from_name ("SIG45"), 0);
 364   signal_pass_update (target_signal_from_name ("SIG45"), 1);
 365
 366   /* By default we don't want to stop on these two, but we do want to pass.  */
 367 #if defined(SIGSELECT)
 368   signal_stop_update (SIGSELECT, 0);
 369   signal_print_update (SIGSELECT, 0);
 370   signal_pass_update (SIGSELECT, 1);
 371 #endif
 372
 373 #if defined(SIGPHOTON)
 374   signal_stop_update (SIGPHOTON, 0);
 375   signal_print_update (SIGPHOTON, 0);
 376   signal_pass_update (SIGPHOTON, 1);
 377 #endif
 378 }
 379
 380 void
 381 _initialize_nto_tdep (void)
 382 {
 383   add_setshow_zinteger_cmd ("nto-debug", class_maintenance,
 384                             &nto_internal_debugging, _("\
 385 Set QNX NTO internal debugging."), _("\
 386 Show QNX NTO internal debugging."), _("\
 387 When non-zero, nto specific debug info is\n\
 388 displayed. Different information is displayed\n\
 389 for different positive values."),
 390                             NULL,
 391                             NULL, /* FIXME: i18n: QNX NTO internal debugging is %s.  */
 392                             &setdebuglist, &showdebuglist);
 393 }