gdb/nto-tdep.c

   1 /* 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
  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, 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"
  29 #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>
  41 #endif
  42
  43 #ifdef __CYGWIN__
  44 static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";
  45 #elif defined(__sun__) || defined(linux)
  46 static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";
  47 #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 {
  73   nto_regset_id = targ->regset_id;
  74   nto_supply_gregset = targ->supply_gregset;
  75   nto_supply_fpregset = targ->supply_fpregset;
  76   nto_supply_altregset = targ->supply_altregset;
  77   nto_supply_regset = targ->supply_regset;
  78   nto_register_area = targ->register_area;
  79   nto_regset_fill = targ->regset_fill;
  80   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 }