gdb/nto-tdep.c

   1 /* nto-tdep.c - general QNX Neutrino target functionality.
   2
   3    Copyright (C) 2003-2013 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 "inferior.h"
  28 #include "gdbarch.h"
  29 #include "bfd.h"
  30 #include "elf-bfd.h"
  31 #include "solib-svr4.h"
  32 #include "gdbcore.h"
  33 #include "objfiles.h"
  34
  35 #include <string.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_path (CCP_WIN_A_TO_POSIX, p, buf, PATH_MAX);
  60   else
  61     cygwin_conv_path (CCP_WIN_A_TO_POSIX, default_nto_target, buf, PATH_MAX);
  62   return buf;
  63 #else
  64   return p ? p : default_nto_target;
  65 #endif
  66 }
  67
  68 /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
  69    CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
  70 int
  71 nto_map_arch_to_cputype (const char *arch)
  72 {
  73   if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
  74     return CPUTYPE_X86;
  75   if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))
  76     return CPUTYPE_PPC;
  77   if (!strcmp (arch, "mips"))
  78     return CPUTYPE_MIPS;
  79   if (!strcmp (arch, "arm"))
  80     return CPUTYPE_ARM;
  81   if (!strcmp (arch, "sh"))
  82     return CPUTYPE_SH;
  83   return CPUTYPE_UNKNOWN;
  84 }
  85
  86 int
  87 nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname)
  88 {
  89   char *buf, *arch_path, *nto_root, *endian;
  90   const char *base;
  91   const char *arch;
  92   int arch_len, len, ret;
  93 #define PATH_FMT \
  94   "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"
  95
  96   nto_root = nto_target ();
  97   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
  98     {
  99       arch = "x86";
 100       endian = "";
 101     }
 102   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 103                    "rs6000") == 0
 104            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 105                    "powerpc") == 0)
 106     {
 107       arch = "ppc";
 108       endian = "be";
 109     }
 110   else
 111     {
 112       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
 113       endian = gdbarch_byte_order (target_gdbarch ())
 114                == BFD_ENDIAN_BIG ? "be" : "le";
 115     }
 116
 117   /* In case nto_root is short, add strlen(solib)
 118      so we can reuse arch_path below.  */
 119
 120   arch_len = (strlen (nto_root) + strlen (arch) + strlen (endian) + 2
 121               + strlen (solib));
 122   arch_path = alloca (arch_len);
 123   xsnprintf (arch_path, arch_len, "%s/%s%s", nto_root, arch, endian);
 124
 125   len = strlen (PATH_FMT) + strlen (arch_path) * 5 + 1;
 126   buf = alloca (len);
 127   xsnprintf (buf, len, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
 128              arch_path);
 129
 130   base = lbasename (solib);
 131   ret = openp (buf, 1, base, o_flags, temp_pathname);
 132   if (ret < 0 && base != solib)
 133     {
 134       xsnprintf (arch_path, arch_len, "/%s", solib);
 135       ret = open (arch_path, o_flags, 0);
 136       if (temp_pathname)
 137         {
 138           if (ret >= 0)
 139             *temp_pathname = gdb_realpath (arch_path);
 140           else
 141             **temp_pathname = '\0';
 142         }
 143     }
 144   return ret;
 145 }
 146
 147 void
 148 nto_init_solib_absolute_prefix (void)
 149 {
 150   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 151   char *nto_root, *endian;
 152   const char *arch;
 153
 154   nto_root = nto_target ();
 155   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
 156     {
 157       arch = "x86";
 158       endian = "";
 159     }
 160   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 161                    "rs6000") == 0
 162            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
 163                    "powerpc") == 0)
 164     {
 165       arch = "ppc";
 166       endian = "be";
 167     }
 168   else
 169     {
 170       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
 171       endian = gdbarch_byte_order (target_gdbarch ())
 172                == BFD_ENDIAN_BIG ? "be" : "le";
 173     }
 174
 175   xsnprintf (arch_path, sizeof (arch_path), "%s/%s%s", nto_root, arch, endian);
 176
 177   xsnprintf (buf, sizeof (buf), "set solib-absolute-prefix %s", arch_path);
 178   execute_command (buf, 0);
 179 }
 180
 181 char **
 182 nto_parse_redirection (char *pargv[], const char **pin, const char **pout,
 183                        const char **perr)
 184 {
 185   char **argv;
 186   char *in, *out, *err, *p;
 187   int argc, i, n;
 188
 189   for (n = 0; pargv[n]; n++);
 190   if (n == 0)
 191     return NULL;
 192   in = "";
 193   out = "";
 194   err = "";
 195
 196   argv = xcalloc (n + 1, sizeof argv[0]);
 197   argc = n;
 198   for (i = 0, n = 0; n < argc; n++)
 199     {
 200       p = pargv[n];
 201       if (*p == '>')
 202         {
 203           p++;
 204           if (*p)
 205             out = p;
 206           else
 207             out = pargv[++n];
 208         }
 209       else if (*p == '<')
 210         {
 211           p++;
 212           if (*p)
 213             in = p;
 214           else
 215             in = pargv[++n];
 216         }
 217       else if (*p++ == '2' && *p++ == '>')
 218         {
 219           if (*p == '&' && *(p + 1) == '1')
 220             err = out;
 221           else if (*p)
 222             err = p;
 223           else
 224             err = pargv[++n];
 225         }
 226       else
 227         argv[i++] = pargv[n];
 228     }
 229   *pin = in;
 230   *pout = out;
 231   *perr = err;
 232   return argv;
 233 }
 234
 235 /* The struct lm_info, lm_addr, and nto_truncate_ptr are copied from
 236    solib-svr4.c to support nto_relocate_section_addresses
 237    which is different from the svr4 version.  */
 238
 239 /* Link map info to include in an allocated so_list entry */
 240
 241 struct lm_info
 242   {
 243     /* Pointer to copy of link map from inferior.  The type is char *
 244        rather than void *, so that we may use byte offsets to find the
 245        various fields without the need for a cast.  */
 246     gdb_byte *lm;
 247
 248     /* Amount by which addresses in the binary should be relocated to
 249        match the inferior.  This could most often be taken directly
 250        from lm, but when prelinking is involved and the prelink base
 251        address changes, we may need a different offset, we want to
 252        warn about the difference and compute it only once.  */
 253     CORE_ADDR l_addr;
 254
 255     /* The target location of lm.  */
 256     CORE_ADDR lm_addr;
 257   };
 258
 259
 260 static CORE_ADDR
 261 lm_addr (struct so_list *so)
 262 {
 263   if (so->lm_info->l_addr == (CORE_ADDR)-1)
 264     {
 265       struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
 266       struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
 267
 268       so->lm_info->l_addr =
 269         extract_typed_address (so->lm_info->lm + lmo->l_addr_offset, ptr_type);
 270     }
 271   return so->lm_info->l_addr;
 272 }
 273
 274 static CORE_ADDR
 275 nto_truncate_ptr (CORE_ADDR addr)
 276 {
 277   if (gdbarch_ptr_bit (target_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 (target_gdbarch ())) - 1);
 283 }
 284
 285 static 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 target_section *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_dummy_supply_regset (struct regcache *regcache, char *regs)
 328 {
 329   /* Do nothing.  */
 330 }
 331
 332 enum gdb_osabi
 333 nto_elf_osabi_sniffer (bfd *abfd)
 334 {
 335   if (nto_is_nto_target)
 336     return nto_is_nto_target (abfd);
 337   return GDB_OSABI_UNKNOWN;
 338 }
 339
 340 static const char *nto_thread_state_str[] =
 341 {
 342   "DEAD",               /* 0  0x00 */
 343   "RUNNING",    /* 1  0x01 */
 344   "READY",      /* 2  0x02 */
 345   "STOPPED",    /* 3  0x03 */
 346   "SEND",               /* 4  0x04 */
 347   "RECEIVE",    /* 5  0x05 */
 348   "REPLY",      /* 6  0x06 */
 349   "STACK",      /* 7  0x07 */
 350   "WAITTHREAD", /* 8  0x08 */
 351   "WAITPAGE",   /* 9  0x09 */
 352   "SIGSUSPEND", /* 10 0x0a */
 353   "SIGWAITINFO",        /* 11 0x0b */
 354   "NANOSLEEP",  /* 12 0x0c */
 355   "MUTEX",      /* 13 0x0d */
 356   "CONDVAR",    /* 14 0x0e */
 357   "JOIN",               /* 15 0x0f */
 358   "INTR",               /* 16 0x10 */
 359   "SEM",                /* 17 0x11 */
 360   "WAITCTX",    /* 18 0x12 */
 361   "NET_SEND",   /* 19 0x13 */
 362   "NET_REPLY"   /* 20 0x14 */
 363 };
 364
 365 char *
 366 nto_extra_thread_info (struct thread_info *ti)
 367 {
 368   if (ti && ti->private
 369       && ti->private->state < ARRAY_SIZE (nto_thread_state_str))
 370     return (char *)nto_thread_state_str [ti->private->state];
 371   return "";
 372 }
 373
 374 void
 375 nto_initialize_signals (void)
 376 {
 377   /* We use SIG45 for pulses, or something, so nostop, noprint
 378      and pass them.  */
 379   signal_stop_update (gdb_signal_from_name ("SIG45"), 0);
 380   signal_print_update (gdb_signal_from_name ("SIG45"), 0);
 381   signal_pass_update (gdb_signal_from_name ("SIG45"), 1);
 382
 383   /* By default we don't want to stop on these two, but we do want to pass.  */
 384 #if defined(SIGSELECT)
 385   signal_stop_update (SIGSELECT, 0);
 386   signal_print_update (SIGSELECT, 0);
 387   signal_pass_update (SIGSELECT, 1);
 388 #endif
 389
 390 #if defined(SIGPHOTON)
 391   signal_stop_update (SIGPHOTON, 0);
 392   signal_print_update (SIGPHOTON, 0);
 393   signal_pass_update (SIGPHOTON, 1);
 394 #endif
 395 }