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 (gdbarch_bfd_arch_info (current_gdbarch)->arch_name, "i386") == 0)
 112     {
 113       arch = "x86";
 114       endian = "";
 115     }
 116   else if (strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
 117                    "rs6000") == 0
 118            || strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
 119                    "powerpc") == 0)
 120     {
 121       arch = "ppc";
 122       endian = "be";
 123     }
 124   else
 125     {
 126       arch = gdbarch_bfd_arch_info (current_gdbarch)->arch_name;
 127       endian = gdbarch_byte_order (current_gdbarch)
 128                == BFD_ENDIAN_BIG ? "be" : "le";
 129     }
 130
 131   /* In case nto_root is short, add strlen(solib)
 132      so we can reuse arch_path below.  */
 133   arch_path =
 134     alloca (strlen (nto_root) + strlen (arch) + strlen (endian) + 2 +
 135             strlen (solib));
 136   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 137
 138   buf = alloca (strlen (PATH_FMT) + strlen (arch_path) * 5 + 1);
 139   sprintf (buf, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
 140            arch_path);
 141
 142   /* Don't assume basename() isn't destructive.  */
 143   base = strrchr (solib, '/');
 144   if (!base)
 145     base = solib;
 146   else
 147     base++;                     /* Skip over '/'.  */
 148
 149   ret = openp (buf, 1, base, o_flags, 0, temp_pathname);
 150   if (ret < 0 && base != solib)
 151     {
 152       sprintf (arch_path, "/%s", solib);
 153       ret = open (arch_path, o_flags, 0);
 154       if (temp_pathname)
 155         {
 156           if (ret >= 0)
 157             *temp_pathname = gdb_realpath (arch_path);
 158           else
 159             **temp_pathname = '\0';
 160         }
 161     }
 162   return ret;
 163 }
 164
 165 void
 166 nto_init_solib_absolute_prefix (void)
 167 {
 168   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 169   char *nto_root, *endian;
 170   const char *arch;
 171
 172   nto_root = nto_target ();
 173   if (strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name, "i386") == 0)
 174     {
 175       arch = "x86";
 176       endian = "";
 177     }
 178   else if (strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
 179                    "rs6000") == 0
 180            || strcmp (gdbarch_bfd_arch_info (current_gdbarch)->arch_name,
 181                    "powerpc") == 0)
 182     {
 183       arch = "ppc";
 184       endian = "be";
 185     }
 186   else
 187     {
 188       arch = gdbarch_bfd_arch_info (current_gdbarch)->arch_name;
 189       endian = gdbarch_byte_order (current_gdbarch)
 190                == BFD_ENDIAN_BIG ? "be" : "le";
 191     }
 192
 193   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 194
 195   sprintf (buf, "set solib-absolute-prefix %s", arch_path);
 196   execute_command (buf, 0);
 197 }
 198
 199 char **
 200 nto_parse_redirection (char *pargv[], char **pin, char **pout, char **perr)
 201 {
 202   char **argv;
 203   char *in, *out, *err, *p;
 204   int argc, i, n;
 205
 206   for (n = 0; pargv[n]; n++);
 207   if (n == 0)
 208     return NULL;
 209   in = "";
 210   out = "";
 211   err = "";
 212
 213   argv = xcalloc (n + 1, sizeof argv[0]);
 214   argc = n;
 215   for (i = 0, n = 0; n < argc; n++)
 216     {
 217       p = pargv[n];
 218       if (*p == '>')
 219         {
 220           p++;
 221           if (*p)
 222             out = p;
 223           else
 224             out = pargv[++n];
 225         }
 226       else if (*p == '<')
 227         {
 228           p++;
 229           if (*p)
 230             in = p;
 231           else
 232             in = pargv[++n];
 233         }
 234       else if (*p++ == '2' && *p++ == '>')
 235         {
 236           if (*p == '&' && *(p + 1) == '1')
 237             err = out;
 238           else if (*p)
 239             err = p;
 240           else
 241             err = pargv[++n];
 242         }
 243       else
 244         argv[i++] = pargv[n];
 245     }
 246   *pin = in;
 247   *pout = out;
 248   *perr = err;
 249   return argv;
 250 }
 251
 252 /* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from
 253    solib-svr4.c to support nto_relocate_section_addresses
 254    which is different from the svr4 version.  */
 255
 256 struct lm_info
 257 {
 258   /* Pointer to copy of link map from inferior.  The type is char *
 259      rather than void *, so that we may use byte offsets to find the
 260      various fields without the need for a cast.  */
 261   char *lm;
 262 };
 263
 264 static CORE_ADDR
 265 LM_ADDR (struct so_list *so)
 266 {
 267   struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
 268
 269   return (CORE_ADDR) extract_signed_integer (so->lm_info->lm +
 270                                              lmo->l_addr_offset,
 271                                              lmo->l_addr_size);
 272 }
 273
 274 static CORE_ADDR
 275 nto_truncate_ptr (CORE_ADDR addr)
 276 {
 277   if (gdbarch_ptr_bit (current_gdbarch) == sizeof (CORE_ADDR) * 8)
 278     /* We don't need to truncate anything, and the bit twiddling below
 279        will fail due to overflow problems.  */
 280     return addr;
 281   else
 282     return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (current_gdbarch)) - 1);
 283 }
 284
 285 Elf_Internal_Phdr *
 286 find_load_phdr (bfd *abfd)
 287 {
 288   Elf_Internal_Phdr *phdr;
 289   unsigned int i;
 290
 291   if (!elf_tdata (abfd))
 292     return NULL;
 293
 294   phdr = elf_tdata (abfd)->phdr;
 295   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 296     {
 297       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 298         return phdr;
 299     }
 300   return NULL;
 301 }
 302
 303 void
 304 nto_relocate_section_addresses (struct so_list *so, struct section_table *sec)
 305 {
 306   /* Neutrino treats the l_addr base address field in link.h as different than
 307      the base address in the System V ABI and so the offset needs to be
 308      calculated and applied to relocations.  */
 309   Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);
 310   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 311
 312   sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);
 313   sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);
 314 }
 315
 316 /* This is cheating a bit because our linker code is in libc.so.  If we
 317    ever implement lazy linking, this may need to be re-examined.  */
 318 int
 319 nto_in_dynsym_resolve_code (CORE_ADDR pc)
 320 {
 321   if (in_plt_section (pc, NULL))
 322     return 1;
 323   return 0;
 324 }
 325
 326 void
 327 nto_generic_supply_gpregset (const struct regset *regset,
 328                              struct regcache *regcache, int regnum,
 329                              const void *gregs, size_t len)
 330 {
 331 }
 332
 333 void
 334 nto_generic_supply_fpregset (const struct regset *regset,
 335                              struct regcache *regcache, int regnum,
 336                              const void *fpregs, size_t len)
 337 {
 338 }
 339
 340 void
 341 nto_generic_supply_altregset (const struct regset *regset,
 342                               struct regcache *regcache, int regnum,
 343                               const void *altregs, size_t len)
 344 {
 345 }
 346
 347 void
 348 nto_dummy_supply_regset (struct regcache *regcache, char *regs)
 349 {
 350   /* Do nothing.  */
 351 }
 352
 353 enum gdb_osabi
 354 nto_elf_osabi_sniffer (bfd *abfd)
 355 {
 356   if (nto_is_nto_target)
 357     return nto_is_nto_target (abfd);
 358   return GDB_OSABI_UNKNOWN;
 359 }
 360
 361 void
 362 nto_initialize_signals (void)
 363 {
 364   /* We use SIG45 for pulses, or something, so nostop, noprint
 365      and pass them.  */
 366   signal_stop_update (target_signal_from_name ("SIG45"), 0);
 367   signal_print_update (target_signal_from_name ("SIG45"), 0);
 368   signal_pass_update (target_signal_from_name ("SIG45"), 1);
 369
 370   /* By default we don't want to stop on these two, but we do want to pass.  */
 371 #if defined(SIGSELECT)
 372   signal_stop_update (SIGSELECT, 0);
 373   signal_print_update (SIGSELECT, 0);
 374   signal_pass_update (SIGSELECT, 1);
 375 #endif
 376
 377 #if defined(SIGPHOTON)
 378   signal_stop_update (SIGPHOTON, 0);
 379   signal_print_update (SIGPHOTON, 0);
 380   signal_pass_update (SIGPHOTON, 1);
 381 #endif
 382 }
 383
 384 void
 385 _initialize_nto_tdep (void)
 386 {
 387   add_setshow_zinteger_cmd ("nto-debug", class_maintenance,
 388                             &nto_internal_debugging, _("\
 389 Set QNX NTO internal debugging."), _("\
 390 Show QNX NTO internal debugging."), _("\
 391 When non-zero, nto specific debug info is\n\
 392 displayed. Different information is displayed\n\
 393 for different positive values."),
 394                             NULL,
 395                             NULL, /* FIXME: i18n: QNX NTO internal debugging is %s.  */
 396                             &setdebuglist, &showdebuglist);
 397 }