gdb/nto-tdep.c

   1 /* nto-tdep.c - general QNX Neutrino target functionality.
   2
   3    Copyright 2003 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, "ppc"))
  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     {
 102       arch = "ppc";
 103       endian = "be";
 104     }
 105   else
 106     {
 107       arch = TARGET_ARCHITECTURE->arch_name;
 108       endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
 109     }
 110
 111   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 112
 113   buf = alloca (strlen (path_fmt) + strlen (arch_path) * 5 + 1);
 114   sprintf (buf, path_fmt, arch_path, arch_path, arch_path, arch_path,
 115            arch_path);
 116
 117   return openp (buf, 1, solib, o_flags, 0, temp_pathname);
 118 }
 119
 120 void
 121 nto_init_solib_absolute_prefix (void)
 122 {
 123   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
 124   char *nto_root, *endian;
 125   const char *arch;
 126
 127   nto_root = nto_target ();
 128   if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
 129     {
 130       arch = "x86";
 131       endian = "";
 132     }
 133   else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0)
 134     {
 135       arch = "ppc";
 136       endian = "be";
 137     }
 138   else
 139     {
 140       arch = TARGET_ARCHITECTURE->arch_name;
 141       endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
 142     }
 143
 144   sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
 145
 146   sprintf (buf, "set solib-absolute-prefix %s", arch_path);
 147   execute_command (buf, 0);
 148 }
 149
 150 char **
 151 nto_parse_redirection (char *pargv[], char **pin, char **pout, char **perr)
 152 {
 153   char **argv;
 154   char *in, *out, *err, *p;
 155   int argc, i, n;
 156
 157   for (n = 0; pargv[n]; n++);
 158   if (n == 0)
 159     return NULL;
 160   in = "";
 161   out = "";
 162   err = "";
 163
 164   argv = xcalloc (n + 1, sizeof argv[0]);
 165   argc = n;
 166   for (i = 0, n = 0; n < argc; n++)
 167     {
 168       p = pargv[n];
 169       if (*p == '>')
 170         {
 171           p++;
 172           if (*p)
 173             out = p;
 174           else
 175             out = pargv[++n];
 176         }
 177       else if (*p == '<')
 178         {
 179           p++;
 180           if (*p)
 181             in = p;
 182           else
 183             in = pargv[++n];
 184         }
 185       else if (*p++ == '2' && *p++ == '>')
 186         {
 187           if (*p == '&' && *(p + 1) == '1')
 188             err = out;
 189           else if (*p)
 190             err = p;
 191           else
 192             err = pargv[++n];
 193         }
 194       else
 195         argv[i++] = pargv[n];
 196     }
 197   *pin = in;
 198   *pout = out;
 199   *perr = err;
 200   return argv;
 201 }
 202
 203 /* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from
 204    solib-svr4.c to support nto_relocate_section_addresses
 205    which is different from the svr4 version.  */
 206
 207 struct lm_info
 208 {
 209   /* Pointer to copy of link map from inferior.  The type is char *
 210      rather than void *, so that we may use byte offsets to find the
 211      various fields without the need for a cast.  */
 212   char *lm;
 213 };
 214
 215 static CORE_ADDR
 216 LM_ADDR (struct so_list *so)
 217 {
 218   struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
 219
 220   return (CORE_ADDR) extract_signed_integer (so->lm_info->lm +
 221                                              lmo->l_addr_offset,
 222                                              lmo->l_addr_size);
 223 }
 224
 225 static CORE_ADDR
 226 nto_truncate_ptr (CORE_ADDR addr)
 227 {
 228   if (TARGET_PTR_BIT == sizeof (CORE_ADDR) * 8)
 229     /* We don't need to truncate anything, and the bit twiddling below
 230        will fail due to overflow problems.  */
 231     return addr;
 232   else
 233     return addr & (((CORE_ADDR) 1 << TARGET_PTR_BIT) - 1);
 234 }
 235
 236 Elf_Internal_Phdr *
 237 find_load_phdr (bfd *abfd)
 238 {
 239   Elf_Internal_Phdr *phdr;
 240   unsigned int i;
 241
 242   if (!elf_tdata (abfd))
 243     return NULL;
 244
 245   phdr = elf_tdata (abfd)->phdr;
 246   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
 247     {
 248       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
 249         return phdr;
 250     }
 251   return NULL;
 252 }
 253
 254 void
 255 nto_relocate_section_addresses (struct so_list *so, struct section_table *sec)
 256 {
 257   /* Neutrino treats the l_addr base address field in link.h as different than
 258      the base address in the System V ABI and so the offset needs to be
 259      calculated and applied to relocations.  */
 260   Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);
 261   unsigned vaddr = phdr ? phdr->p_vaddr : 0;
 262
 263   sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);
 264   sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);
 265 }
 266
 267 static void
 268 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
 269                       int which, CORE_ADDR reg_addr)
 270 {
 271   nto_regset_t regset;
 272
 273 /* See corelow.c:get_core_registers for values of WHICH.  */
 274   if (which == 0)
 275     {
 276       memcpy ((char *) &regset, core_reg_sect,
 277               min (core_reg_size, sizeof (regset)));
 278       nto_supply_gregset ((char *) &regset);
 279     }
 280   else if (which == 2)
 281     {
 282       memcpy ((char *) &regset, core_reg_sect,
 283               min (core_reg_size, sizeof (regset)));
 284       nto_supply_fpregset ((char *) &regset);
 285     }
 286 }
 287
 288 void
 289 nto_dummy_supply_regset (char *regs)
 290 {
 291   /* Do nothing.  */
 292 }
 293
 294 /* Register that we are able to handle ELF file formats using standard
 295    procfs "regset" structures.  */
 296 static struct core_fns regset_core_fns = {
 297   bfd_target_elf_flavour,       /* core_flavour */
 298   default_check_format,         /* check_format */
 299   default_core_sniffer,         /* core_sniffer */
 300   fetch_core_registers,         /* core_read_registers */
 301   NULL                          /* next */
 302 };
 303
 304 void
 305 _initialize_nto_tdep (void)
 306 {
 307   add_setshow_cmd ("nto-debug", class_maintenance, var_zinteger,
 308                   &nto_internal_debugging, "Set QNX NTO internal debugging.\n\
 309 When non-zero, nto specific debug info is\n\
 310 displayed. Different information is displayed\n\
 311 for different positive values.",  "Show QNX NTO internal debugging.\n",
 312                   NULL, NULL, &setdebuglist, &showdebuglist);
 313
 314   /* We use SIG45 for pulses, or something, so nostop, noprint
 315      and pass them.  */
 316   signal_stop_update (target_signal_from_name ("SIG45"), 0);
 317   signal_print_update (target_signal_from_name ("SIG45"), 0);
 318   signal_pass_update (target_signal_from_name ("SIG45"), 1);
 319
 320   /* By default we don't want to stop on these two, but we do want to pass.  */
 321 #if defined(SIGSELECT)
 322   signal_stop_update (SIGSELECT, 0);
 323   signal_print_update (SIGSELECT, 0);
 324   signal_pass_update (SIGSELECT, 1);
 325 #endif
 326
 327 #if defined(SIGPHOTON)
 328   signal_stop_update (SIGPHOTON, 0);
 329   signal_print_update (SIGPHOTON, 0);
 330   signal_pass_update (SIGPHOTON, 1);
 331 #endif
 332
 333   /* Register core file support.  */
 334   add_core_fns (&regset_core_fns);
 335 }