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 /* 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[PATH_MAX], *nto_root, *endian;
  90   const char *arch;
  91   char *path_fmt = "%s/lib:%s/usr/lib:%s/usr/photon/lib\
  92 :%s/usr/photon/dll:%s/lib/dll";
  93
  94   nto_root = nto_target ();
  95   if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
  96     {
  97       arch = "x86";
  98       endian = "";
  99     }
 100   else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0
 101            || strcmp (TARGET_ARCHITECTURE->arch_name, "powerpc") == 0)
 102     {
 103       arch = "ppc";
 104       endian = "be";
 105     }
 106   else
 107     {
 108       arch = TARGET_ARCHITECTURE->arch_name;
 109       endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
 110     }
 111
 112   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 113
 114   buf = alloca (strlen (path_fmt) + strlen (arch_path) * 5 + 1);
 115   sprintf (buf, path_fmt, arch_path, arch_path, arch_path, arch_path,
 116            arch_path);
 117
 118   return openp (buf, OPF_TRY_CWD_FIRST, solib, o_flags, 0, temp_pathname);
 119 }
 120
 121 void
 122 nto_init_solib_absolute_prefix (void)
 123 {
 124   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 125   char *nto_root, *endian;
 126   const char *arch;
 127
 128   nto_root = nto_target ();
 129   if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
 130     {
 131       arch = "x86";
 132       endian = "";
 133     }
 134   else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0
 135            || strcmp (TARGET_ARCHITECTURE->arch_name, "powerpc") == 0)
 136     {
 137       arch = "ppc";
 138       endian = "be";
 139     }
 140   else
 141     {
 142       arch = TARGET_ARCHITECTURE->arch_name;
 143       endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
 144     }
 145
 146   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 147
 148   sprintf (buf, "set solib-absolute-prefix %s", arch_path);
 149   execute_command (buf, 0);
 150 }
 151
 152 char **
 153 nto_parse_redirection (char *pargv[], char **pin, char **pout, char **perr)
 154 {
 155   char **argv;
 156   char *in, *out, *err, *p;
 157   int argc, i, n;
 158
 159   for (n = 0; pargv[n]; n++);
 160   if (n == 0)
 161     return NULL;
 162   in = "";
 163   out = "";
 164   err = "";
 165
 166   argv = xcalloc (n + 1, sizeof argv[0]);
 167   argc = n;
 168   for (i = 0, n = 0; n < argc; n++)
 169     {
 170       p = pargv[n];
 171       if (*p == '>')
 172         {
 173           p++;
 174           if (*p)
 175             out = p;
 176           else
 177             out = pargv[++n];
 178         }
 179       else if (*p == '<')
 180         {
 181           p++;
 182           if (*p)
 183             in = p;
 184           else
 185             in = pargv[++n];
 186         }
 187       else if (*p++ == '2' && *p++ == '>')
 188         {
 189           if (*p == '&' && *(p + 1) == '1')
 190             err = out;
 191           else if (*p)
 192             err = p;
 193           else
 194             err = pargv[++n];
 195         }
 196       else
 197         argv[i++] = pargv[n];
 198     }
 199   *pin = in;
 200   *pout = out;
 201   *perr = err;
 202   return argv;
 203 }
 204
 205 /* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from
 206    solib-svr4.c to support nto_relocate_section_addresses
 207    which is different from the svr4 version.  */
 208
 209 struct lm_info
 210 {
 211   /* Pointer to copy of link map from inferior.  The type is char *
 212      rather than void *, so that we may use byte offsets to find the
 213      various fields without the need for a cast.  */
 214   char *lm;
 215 };
 216
 217 static CORE_ADDR
 218 LM_ADDR (struct so_list *so)
 219 {
 220   struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
 221
 222   return (CORE_ADDR) extract_signed_integer (so->lm_info->lm +
 223                                              lmo->l_addr_offset,
 224                                              lmo->l_addr_size);
 225 }
 226
 227 static CORE_ADDR
 228 nto_truncate_ptr (CORE_ADDR addr)
 229 {
 230   if (TARGET_PTR_BIT == sizeof (CORE_ADDR) * 8)
 231     /* We don't need to truncate anything, and the bit twiddling below
 232        will fail due to overflow problems.  */
 233     return addr;
 234   else
 235     return addr & (((CORE_ADDR) 1 << TARGET_PTR_BIT) - 1);
 236 }
 237
 238 Elf_Internal_Phdr *
 239 find_load_phdr (bfd *abfd)
 240 {
 241   Elf_Internal_Phdr *phdr;
 242   unsigned int i;
 243
 244   if (!elf_tdata (abfd))
 245     return NULL;
 246
 247   phdr = elf_tdata (abfd)->phdr;
 248   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 249     {
 250       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 251         return phdr;
 252     }
 253   return NULL;
 254 }
 255
 256 void
 257 nto_relocate_section_addresses (struct so_list *so, struct section_table *sec)
 258 {
 259   /* Neutrino treats the l_addr base address field in link.h as different than
 260      the base address in the System V ABI and so the offset needs to be
 261      calculated and applied to relocations.  */
 262   Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);
 263   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 264
 265   sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);
 266   sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);
 267 }
 268
 269 static void
 270 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
 271                       int which, CORE_ADDR reg_addr)
 272 {
 273   nto_regset_t regset;
 274
 275 /* See corelow.c:get_core_registers for values of WHICH.  */
 276   if (which == 0)
 277     {
 278       memcpy ((char *) &regset, core_reg_sect,
 279               min (core_reg_size, sizeof (regset)));
 280       nto_supply_gregset ((char *) &regset);
 281     }
 282   else if (which == 2)
 283     {
 284       memcpy ((char *) &regset, core_reg_sect,
 285               min (core_reg_size, sizeof (regset)));
 286       nto_supply_fpregset ((char *) &regset);
 287     }
 288 }
 289
 290 void
 291 nto_dummy_supply_regset (char *regs)
 292 {
 293   /* Do nothing.  */
 294 }
 295
 296 /* Register that we are able to handle ELF file formats using standard
 297    procfs "regset" structures.  */
 298 static struct core_fns regset_core_fns = {
 299   bfd_target_elf_flavour,       /* core_flavour */
 300   default_check_format,         /* check_format */
 301   default_core_sniffer,         /* core_sniffer */
 302   fetch_core_registers,         /* core_read_registers */
 303   NULL                          /* next */
 304 };
 305
 306 void
 307 _initialize_nto_tdep (void)
 308 {
 309   add_setshow_zinteger_cmd ("nto-debug", class_maintenance,
 310                             &nto_internal_debugging, "\
 311 Set QNX NTO internal debugging.", "\
 312 Show QNX NTO internal debugging.", "\
 313 When non-zero, nto specific debug info is\n\
 314 displayed. Different information is displayed\n\
 315 for different positive values.", "\
 316 QNX NTO internal debugging is %s.",
 317                             NULL, NULL, &setdebuglist, &showdebuglist);
 318
 319   /* We use SIG45 for pulses, or something, so nostop, noprint
 320      and pass them.  */
 321   signal_stop_update (target_signal_from_name ("SIG45"), 0);
 322   signal_print_update (target_signal_from_name ("SIG45"), 0);
 323   signal_pass_update (target_signal_from_name ("SIG45"), 1);
 324
 325   /* By default we don't want to stop on these two, but we do want to pass.  */
 326 #if defined(SIGSELECT)
 327   signal_stop_update (SIGSELECT, 0);
 328   signal_print_update (SIGSELECT, 0);
 329   signal_pass_update (SIGSELECT, 1);
 330 #endif
 331
 332 #if defined(SIGPHOTON)
 333   signal_stop_update (SIGPHOTON, 0);
 334   signal_print_update (SIGPHOTON, 0);
 335   signal_pass_update (SIGPHOTON, 1);
 336 #endif
 337
 338   /* Register core file support.  */
 339   deprecated_add_core_fns (&regset_core_fns);
 340 }