gdb/nto-tdep.c

   1 /* nto-tdep.c - general QNX Neutrino target functionality.
   2
   3    Copyright 2003, 2004 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., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, 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
  37 #ifdef __CYGWIN__
  38 #include <sys/cygwin.h>
  39 #endif
  40
  41 #ifdef __CYGWIN__
  42 static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";
  43 #elif defined(__sun__) || defined(linux)
  44 static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";
  45 #else
  46 static char default_nto_target[] = "";
  47 #endif
  48
  49 struct nto_target_ops current_nto_target;
  50
  51 static char *
  52 nto_target (void)
  53 {
  54   char *p = getenv ("QNX_TARGET");
  55
  56 #ifdef __CYGWIN__
  57   static char buf[PATH_MAX];
  58   if (p)
  59     cygwin_conv_to_posix_path (p, buf);
  60   else
  61     cygwin_conv_to_posix_path (default_nto_target, buf);
  62   return buf;
  63 #else
  64   return p ? p : default_nto_target;
  65 #endif
  66 }
  67
  68 void
  69 nto_set_target (struct nto_target_ops *targ)
  70 {
  71   nto_regset_id = targ->regset_id;
  72   nto_supply_gregset = targ->supply_gregset;
  73   nto_supply_fpregset = targ->supply_fpregset;
  74   nto_supply_altregset = targ->supply_altregset;
  75   nto_supply_regset = targ->supply_regset;
  76   nto_register_area = targ->register_area;
  77   nto_regset_fill = targ->regset_fill;
  78   nto_fetch_link_map_offsets = targ->fetch_link_map_offsets;
  79 }
  80
  81 /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
  82    CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
  83 int
  84 nto_map_arch_to_cputype (const char *arch)
  85 {
  86   if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
  87     return CPUTYPE_X86;
  88   if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))
  89     return CPUTYPE_PPC;
  90   if (!strcmp (arch, "mips"))
  91     return CPUTYPE_MIPS;
  92   if (!strcmp (arch, "arm"))
  93     return CPUTYPE_ARM;
  94   if (!strcmp (arch, "sh"))
  95     return CPUTYPE_SH;
  96   return CPUTYPE_UNKNOWN;
  97 }
  98
  99 int
 100 nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname)
 101 {
 102   char *buf, *arch_path, *nto_root, *endian, *base;
 103   const char *arch;
 104   int ret;
 105 #define PATH_FMT "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"
 106
 107   nto_root = nto_target ();
 108   if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
 109     {
 110       arch = "x86";
 111       endian = "";
 112     }
 113   else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0
 114            || strcmp (TARGET_ARCHITECTURE->arch_name, "powerpc") == 0)
 115     {
 116       arch = "ppc";
 117       endian = "be";
 118     }
 119   else
 120     {
 121       arch = TARGET_ARCHITECTURE->arch_name;
 122       endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
 123     }
 124
 125   /* In case nto_root is short, add strlen(solib)
 126      so we can reuse arch_path below.  */
 127   arch_path =
 128     alloca (strlen (nto_root) + strlen (arch) + strlen (endian) + 2 +
 129             strlen (solib));
 130   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 131
 132   buf = alloca (strlen (PATH_FMT) + strlen (arch_path) * 5 + 1);
 133   sprintf (buf, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
 134            arch_path);
 135
 136   /* Don't assume basename() isn't destructive.  */
 137   base = strrchr (solib, '/');
 138   if (!base)
 139     base = solib;
 140   else
 141     base++;                     /* Skip over '/'.  */
 142
 143   ret = openp (buf, 1, base, o_flags, 0, temp_pathname);
 144   if (ret < 0 && base != solib)
 145     {
 146       sprintf (arch_path, "/%s", solib);
 147       ret = open (arch_path, o_flags, 0);
 148       if (temp_pathname)
 149         {
 150           if (ret >= 0)
 151             *temp_pathname = gdb_realpath (arch_path);
 152           else
 153             **temp_pathname = '\0';
 154         }
 155     }
 156   return ret;
 157 }
 158
 159 void
 160 nto_init_solib_absolute_prefix (void)
 161 {
 162   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 163   char *nto_root, *endian;
 164   const char *arch;
 165
 166   nto_root = nto_target ();
 167   if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
 168     {
 169       arch = "x86";
 170       endian = "";
 171     }
 172   else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0
 173            || strcmp (TARGET_ARCHITECTURE->arch_name, "powerpc") == 0)
 174     {
 175       arch = "ppc";
 176       endian = "be";
 177     }
 178   else
 179     {
 180       arch = TARGET_ARCHITECTURE->arch_name;
 181       endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
 182     }
 183
 184   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 185
 186   sprintf (buf, "set solib-absolute-prefix %s", arch_path);
 187   execute_command (buf, 0);
 188 }
 189
 190 char **
 191 nto_parse_redirection (char *pargv[], char **pin, char **pout, char **perr)
 192 {
 193   char **argv;
 194   char *in, *out, *err, *p;
 195   int argc, i, n;
 196
 197   for (n = 0; pargv[n]; n++);
 198   if (n == 0)
 199     return NULL;
 200   in = "";
 201   out = "";
 202   err = "";
 203
 204   argv = xcalloc (n + 1, sizeof argv[0]);
 205   argc = n;
 206   for (i = 0, n = 0; n < argc; n++)
 207     {
 208       p = pargv[n];
 209       if (*p == '>')
 210         {
 211           p++;
 212           if (*p)
 213             out = p;
 214           else
 215             out = pargv[++n];
 216         }
 217       else if (*p == '<')
 218         {
 219           p++;
 220           if (*p)
 221             in = p;
 222           else
 223             in = pargv[++n];
 224         }
 225       else if (*p++ == '2' && *p++ == '>')
 226         {
 227           if (*p == '&' && *(p + 1) == '1')
 228             err = out;
 229           else if (*p)
 230             err = p;
 231           else
 232             err = pargv[++n];
 233         }
 234       else
 235         argv[i++] = pargv[n];
 236     }
 237   *pin = in;
 238   *pout = out;
 239   *perr = err;
 240   return argv;
 241 }
 242
 243 /* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from
 244    solib-svr4.c to support nto_relocate_section_addresses
 245    which is different from the svr4 version.  */
 246
 247 struct lm_info
 248 {
 249   /* Pointer to copy of link map from inferior.  The type is char *
 250      rather than void *, so that we may use byte offsets to find the
 251      various fields without the need for a cast.  */
 252   char *lm;
 253 };
 254
 255 static CORE_ADDR
 256 LM_ADDR (struct so_list *so)
 257 {
 258   struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
 259
 260   return (CORE_ADDR) extract_signed_integer (so->lm_info->lm +
 261                                              lmo->l_addr_offset,
 262                                              lmo->l_addr_size);
 263 }
 264
 265 static CORE_ADDR
 266 nto_truncate_ptr (CORE_ADDR addr)
 267 {
 268   if (TARGET_PTR_BIT == sizeof (CORE_ADDR) * 8)
 269     /* We don't need to truncate anything, and the bit twiddling below
 270        will fail due to overflow problems.  */
 271     return addr;
 272   else
 273     return addr & (((CORE_ADDR) 1 << TARGET_PTR_BIT) - 1);
 274 }
 275
 276 Elf_Internal_Phdr *
 277 find_load_phdr (bfd *abfd)
 278 {
 279   Elf_Internal_Phdr *phdr;
 280   unsigned int i;
 281
 282   if (!elf_tdata (abfd))
 283     return NULL;
 284
 285   phdr = elf_tdata (abfd)->phdr;
 286   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 287     {
 288       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 289         return phdr;
 290     }
 291   return NULL;
 292 }
 293
 294 void
 295 nto_relocate_section_addresses (struct so_list *so, struct section_table *sec)
 296 {
 297   /* Neutrino treats the l_addr base address field in link.h as different than
 298      the base address in the System V ABI and so the offset needs to be
 299      calculated and applied to relocations.  */
 300   Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);
 301   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 302
 303   sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);
 304   sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);
 305 }
 306
 307 /* This is cheating a bit because our linker code is in libc.so.  If we
 308    ever implement lazy linking, this may need to be re-examined.  */
 309 int
 310 nto_in_dynsym_resolve_code (CORE_ADDR pc)
 311 {
 312   if (in_plt_section (pc, NULL))
 313     return 1;
 314   return 0;
 315 }
 316
 317 void
 318 nto_generic_supply_gpregset (const struct regset *regset,
 319                              struct regcache *regcache, int regnum,
 320                              const void *gregs, size_t len)
 321 {
 322 }
 323
 324 void
 325 nto_generic_supply_fpregset (const struct regset *regset,
 326                              struct regcache *regcache, int regnum,
 327                              const void *fpregs, size_t len)
 328 {
 329 }
 330
 331 void
 332 nto_generic_supply_altregset (const struct regset *regset,
 333                               struct regcache *regcache, int regnum,
 334                               const void *altregs, size_t len)
 335 {
 336 }
 337
 338 void
 339 nto_dummy_supply_regset (char *regs)
 340 {
 341   /* Do nothing.  */
 342 }
 343
 344 enum gdb_osabi
 345 nto_elf_osabi_sniffer (bfd *abfd)
 346 {
 347   if (nto_is_nto_target)
 348     return nto_is_nto_target (abfd);
 349   return GDB_OSABI_UNKNOWN;
 350 }
 351
 352 void
 353 nto_initialize_signals (void)
 354 {
 355   /* We use SIG45 for pulses, or something, so nostop, noprint
 356      and pass them.  */
 357   signal_stop_update (target_signal_from_name ("SIG45"), 0);
 358   signal_print_update (target_signal_from_name ("SIG45"), 0);
 359   signal_pass_update (target_signal_from_name ("SIG45"), 1);
 360
 361   /* By default we don't want to stop on these two, but we do want to pass.  */
 362 #if defined(SIGSELECT)
 363   signal_stop_update (SIGSELECT, 0);
 364   signal_print_update (SIGSELECT, 0);
 365   signal_pass_update (SIGSELECT, 1);
 366 #endif
 367
 368 #if defined(SIGPHOTON)
 369   signal_stop_update (SIGPHOTON, 0);
 370   signal_print_update (SIGPHOTON, 0);
 371   signal_pass_update (SIGPHOTON, 1);
 372 #endif
 373 }
 374
 375 void
 376 _initialize_nto_tdep (void)
 377 {
 378   add_setshow_zinteger_cmd ("nto-debug", class_maintenance,
 379                             &nto_internal_debugging, _("\
 380 Set QNX NTO internal debugging."), _("\
 381 Show QNX NTO internal debugging."), _("\
 382 When non-zero, nto specific debug info is\n\
 383 displayed. Different information is displayed\n\
 384 for different positive values."),
 385                             NULL, /* FIXME: i18n: QNX NTO internal debugging is %s.  */
 386                             NULL, NULL, &setdebuglist, &showdebuglist);
 387 }