| 1 | /* nto-tdep.c - general QNX Neutrino target functionality. |
| 2 | |
| 3 | Copyright (C) 2003, 2004, 2007, 2008, 2009 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 "cli/cli-decode.h" |
| 28 | #include "cli/cli-cmds.h" |
| 29 | #include "inferior.h" |
| 30 | #include "gdbarch.h" |
| 31 | #include "bfd.h" |
| 32 | #include "elf-bfd.h" |
| 33 | #include "solib-svr4.h" |
| 34 | #include "gdbcore.h" |
| 35 | #include "objfiles.h" |
| 36 | |
| 37 | #include <string.h> |
| 38 | |
| 39 | #ifdef __CYGWIN__ |
| 40 | #include <sys/cygwin.h> |
| 41 | #endif |
| 42 | |
| 43 | #ifdef __CYGWIN__ |
| 44 | static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6"; |
| 45 | #elif defined(__sun__) || defined(linux) |
| 46 | static char default_nto_target[] = "/opt/QNXsdk/target/qnx6"; |
| 47 | #else |
| 48 | static char default_nto_target[] = ""; |
| 49 | #endif |
| 50 | |
| 51 | struct nto_target_ops current_nto_target; |
| 52 | |
| 53 | static char * |
| 54 | nto_target (void) |
| 55 | { |
| 56 | char *p = getenv ("QNX_TARGET"); |
| 57 | |
| 58 | #ifdef __CYGWIN__ |
| 59 | static char buf[PATH_MAX]; |
| 60 | if (p) |
| 61 | cygwin_conv_to_posix_path (p, buf); |
| 62 | else |
| 63 | cygwin_conv_to_posix_path (default_nto_target, buf); |
| 64 | return buf; |
| 65 | #else |
| 66 | return p ? p : default_nto_target; |
| 67 | #endif |
| 68 | } |
| 69 | |
| 70 | void |
| 71 | nto_set_target (struct nto_target_ops *targ) |
| 72 | { |
| 73 | nto_regset_id = targ->regset_id; |
| 74 | nto_supply_gregset = targ->supply_gregset; |
| 75 | nto_supply_fpregset = targ->supply_fpregset; |
| 76 | nto_supply_altregset = targ->supply_altregset; |
| 77 | nto_supply_regset = targ->supply_regset; |
| 78 | nto_register_area = targ->register_area; |
| 79 | nto_regset_fill = targ->regset_fill; |
| 80 | nto_fetch_link_map_offsets = targ->fetch_link_map_offsets; |
| 81 | } |
| 82 | |
| 83 | /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86, |
| 84 | CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h. */ |
| 85 | int |
| 86 | nto_map_arch_to_cputype (const char *arch) |
| 87 | { |
| 88 | if (!strcmp (arch, "i386") || !strcmp (arch, "x86")) |
| 89 | return CPUTYPE_X86; |
| 90 | if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc")) |
| 91 | return CPUTYPE_PPC; |
| 92 | if (!strcmp (arch, "mips")) |
| 93 | return CPUTYPE_MIPS; |
| 94 | if (!strcmp (arch, "arm")) |
| 95 | return CPUTYPE_ARM; |
| 96 | if (!strcmp (arch, "sh")) |
| 97 | return CPUTYPE_SH; |
| 98 | return CPUTYPE_UNKNOWN; |
| 99 | } |
| 100 | |
| 101 | int |
| 102 | nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname) |
| 103 | { |
| 104 | char *buf, *arch_path, *nto_root, *endian, *base; |
| 105 | const char *arch; |
| 106 | int ret; |
| 107 | #define PATH_FMT "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll" |
| 108 | |
| 109 | nto_root = nto_target (); |
| 110 | if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, "i386") == 0) |
| 111 | { |
| 112 | arch = "x86"; |
| 113 | endian = ""; |
| 114 | } |
| 115 | else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, |
| 116 | "rs6000") == 0 |
| 117 | || strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, |
| 118 | "powerpc") == 0) |
| 119 | { |
| 120 | arch = "ppc"; |
| 121 | endian = "be"; |
| 122 | } |
| 123 | else |
| 124 | { |
| 125 | arch = gdbarch_bfd_arch_info (target_gdbarch)->arch_name; |
| 126 | endian = gdbarch_byte_order (target_gdbarch) |
| 127 | == BFD_ENDIAN_BIG ? "be" : "le"; |
| 128 | } |
| 129 | |
| 130 | /* In case nto_root is short, add strlen(solib) |
| 131 | so we can reuse arch_path below. */ |
| 132 | arch_path = |
| 133 | alloca (strlen (nto_root) + strlen (arch) + strlen (endian) + 2 + |
| 134 | strlen (solib)); |
| 135 | sprintf (arch_path, "%s/%s%s", nto_root, arch, endian); |
| 136 | |
| 137 | buf = alloca (strlen (PATH_FMT) + strlen (arch_path) * 5 + 1); |
| 138 | sprintf (buf, PATH_FMT, arch_path, arch_path, arch_path, arch_path, |
| 139 | arch_path); |
| 140 | |
| 141 | /* Don't assume basename() isn't destructive. */ |
| 142 | base = strrchr (solib, '/'); |
| 143 | if (!base) |
| 144 | base = solib; |
| 145 | else |
| 146 | base++; /* Skip over '/'. */ |
| 147 | |
| 148 | ret = openp (buf, 1, base, o_flags, 0, temp_pathname); |
| 149 | if (ret < 0 && base != solib) |
| 150 | { |
| 151 | sprintf (arch_path, "/%s", solib); |
| 152 | ret = open (arch_path, o_flags, 0); |
| 153 | if (temp_pathname) |
| 154 | { |
| 155 | if (ret >= 0) |
| 156 | *temp_pathname = gdb_realpath (arch_path); |
| 157 | else |
| 158 | **temp_pathname = '\0'; |
| 159 | } |
| 160 | } |
| 161 | return ret; |
| 162 | } |
| 163 | |
| 164 | void |
| 165 | nto_init_solib_absolute_prefix (void) |
| 166 | { |
| 167 | char buf[PATH_MAX * 2], arch_path[PATH_MAX]; |
| 168 | char *nto_root, *endian; |
| 169 | const char *arch; |
| 170 | |
| 171 | nto_root = nto_target (); |
| 172 | if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, "i386") == 0) |
| 173 | { |
| 174 | arch = "x86"; |
| 175 | endian = ""; |
| 176 | } |
| 177 | else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, |
| 178 | "rs6000") == 0 |
| 179 | || strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, |
| 180 | "powerpc") == 0) |
| 181 | { |
| 182 | arch = "ppc"; |
| 183 | endian = "be"; |
| 184 | } |
| 185 | else |
| 186 | { |
| 187 | arch = gdbarch_bfd_arch_info (target_gdbarch)->arch_name; |
| 188 | endian = gdbarch_byte_order (target_gdbarch) |
| 189 | == BFD_ENDIAN_BIG ? "be" : "le"; |
| 190 | } |
| 191 | |
| 192 | sprintf (arch_path, "%s/%s%s", nto_root, arch, endian); |
| 193 | |
| 194 | sprintf (buf, "set solib-absolute-prefix %s", arch_path); |
| 195 | execute_command (buf, 0); |
| 196 | } |
| 197 | |
| 198 | char ** |
| 199 | nto_parse_redirection (char *pargv[], const char **pin, const char **pout, |
| 200 | const 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 | /* Link map info to include in an allocated so_list entry */ |
| 257 | |
| 258 | struct lm_info |
| 259 | { |
| 260 | /* Pointer to copy of link map from inferior. The type is char * |
| 261 | rather than void *, so that we may use byte offsets to find the |
| 262 | various fields without the need for a cast. */ |
| 263 | gdb_byte *lm; |
| 264 | |
| 265 | /* Amount by which addresses in the binary should be relocated to |
| 266 | match the inferior. This could most often be taken directly |
| 267 | from lm, but when prelinking is involved and the prelink base |
| 268 | address changes, we may need a different offset, we want to |
| 269 | warn about the difference and compute it only once. */ |
| 270 | CORE_ADDR l_addr; |
| 271 | |
| 272 | /* The target location of lm. */ |
| 273 | CORE_ADDR lm_addr; |
| 274 | }; |
| 275 | |
| 276 | |
| 277 | static CORE_ADDR |
| 278 | LM_ADDR (struct so_list *so) |
| 279 | { |
| 280 | if (so->lm_info->l_addr == (CORE_ADDR)-1) |
| 281 | { |
| 282 | struct link_map_offsets *lmo = nto_fetch_link_map_offsets (); |
| 283 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
| 284 | |
| 285 | so->lm_info->l_addr = |
| 286 | extract_typed_address (so->lm_info->lm + lmo->l_addr_offset, ptr_type); |
| 287 | } |
| 288 | return so->lm_info->l_addr; |
| 289 | } |
| 290 | |
| 291 | static CORE_ADDR |
| 292 | nto_truncate_ptr (CORE_ADDR addr) |
| 293 | { |
| 294 | if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8) |
| 295 | /* We don't need to truncate anything, and the bit twiddling below |
| 296 | will fail due to overflow problems. */ |
| 297 | return addr; |
| 298 | else |
| 299 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1); |
| 300 | } |
| 301 | |
| 302 | static Elf_Internal_Phdr * |
| 303 | find_load_phdr (bfd *abfd) |
| 304 | { |
| 305 | Elf_Internal_Phdr *phdr; |
| 306 | unsigned int i; |
| 307 | |
| 308 | if (!elf_tdata (abfd)) |
| 309 | return NULL; |
| 310 | |
| 311 | phdr = elf_tdata (abfd)->phdr; |
| 312 | for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++) |
| 313 | { |
| 314 | if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X)) |
| 315 | return phdr; |
| 316 | } |
| 317 | return NULL; |
| 318 | } |
| 319 | |
| 320 | void |
| 321 | nto_relocate_section_addresses (struct so_list *so, struct section_table *sec) |
| 322 | { |
| 323 | /* Neutrino treats the l_addr base address field in link.h as different than |
| 324 | the base address in the System V ABI and so the offset needs to be |
| 325 | calculated and applied to relocations. */ |
| 326 | Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd); |
| 327 | unsigned vaddr = phdr ? phdr->p_vaddr : 0; |
| 328 | |
| 329 | sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr); |
| 330 | sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr); |
| 331 | } |
| 332 | |
| 333 | /* This is cheating a bit because our linker code is in libc.so. If we |
| 334 | ever implement lazy linking, this may need to be re-examined. */ |
| 335 | int |
| 336 | nto_in_dynsym_resolve_code (CORE_ADDR pc) |
| 337 | { |
| 338 | if (in_plt_section (pc, NULL)) |
| 339 | return 1; |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | void |
| 344 | nto_generic_supply_gpregset (const struct regset *regset, |
| 345 | struct regcache *regcache, int regnum, |
| 346 | const void *gregs, size_t len) |
| 347 | { |
| 348 | } |
| 349 | |
| 350 | void |
| 351 | nto_generic_supply_fpregset (const struct regset *regset, |
| 352 | struct regcache *regcache, int regnum, |
| 353 | const void *fpregs, size_t len) |
| 354 | { |
| 355 | } |
| 356 | |
| 357 | void |
| 358 | nto_generic_supply_altregset (const struct regset *regset, |
| 359 | struct regcache *regcache, int regnum, |
| 360 | const void *altregs, size_t len) |
| 361 | { |
| 362 | } |
| 363 | |
| 364 | void |
| 365 | nto_dummy_supply_regset (struct regcache *regcache, char *regs) |
| 366 | { |
| 367 | /* Do nothing. */ |
| 368 | } |
| 369 | |
| 370 | enum gdb_osabi |
| 371 | nto_elf_osabi_sniffer (bfd *abfd) |
| 372 | { |
| 373 | if (nto_is_nto_target) |
| 374 | return nto_is_nto_target (abfd); |
| 375 | return GDB_OSABI_UNKNOWN; |
| 376 | } |
| 377 | |
| 378 | void |
| 379 | nto_initialize_signals (void) |
| 380 | { |
| 381 | /* We use SIG45 for pulses, or something, so nostop, noprint |
| 382 | and pass them. */ |
| 383 | signal_stop_update (target_signal_from_name ("SIG45"), 0); |
| 384 | signal_print_update (target_signal_from_name ("SIG45"), 0); |
| 385 | signal_pass_update (target_signal_from_name ("SIG45"), 1); |
| 386 | |
| 387 | /* By default we don't want to stop on these two, but we do want to pass. */ |
| 388 | #if defined(SIGSELECT) |
| 389 | signal_stop_update (SIGSELECT, 0); |
| 390 | signal_print_update (SIGSELECT, 0); |
| 391 | signal_pass_update (SIGSELECT, 1); |
| 392 | #endif |
| 393 | |
| 394 | #if defined(SIGPHOTON) |
| 395 | signal_stop_update (SIGPHOTON, 0); |
| 396 | signal_print_update (SIGPHOTON, 0); |
| 397 | signal_pass_update (SIGPHOTON, 1); |
| 398 | #endif |
| 399 | } |
| 400 | |
| 401 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 402 | extern initialize_file_ftype _initialize_nto_tdep; |
| 403 | |
| 404 | void |
| 405 | _initialize_nto_tdep (void) |
| 406 | { |
| 407 | add_setshow_zinteger_cmd ("nto-debug", class_maintenance, |
| 408 | &nto_internal_debugging, _("\ |
| 409 | Set QNX NTO internal debugging."), _("\ |
| 410 | Show QNX NTO internal debugging."), _("\ |
| 411 | When non-zero, nto specific debug info is\n\ |
| 412 | displayed. Different information is displayed\n\ |
| 413 | for different positive values."), |
| 414 | NULL, |
| 415 | NULL, /* FIXME: i18n: QNX NTO internal debugging is %s. */ |
| 416 | &setdebuglist, &showdebuglist); |
| 417 | } |