gdb/nto-tdep.c - gdb

Global variables defined

Data types defined

Functions defined

Macros defined

Source code

  1. /* nto-tdep.c - general QNX Neutrino target functionality.

  3.    Copyright (C) 2003-2015 Free Software Foundation, Inc.

  5.    Contributed by QNX Software Systems Ltd.

  7.    This file is part of GDB.

  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.

  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.

  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/>.  */

  22. #include "defs.h"
  23. #include <sys/stat.h>
  24. #include "nto-tdep.h"
  25. #include "top.h"
  26. #include "inferior.h"
  27. #include "infrun.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"

  35. #ifdef __CYGWIN__
  36. #include <sys/cygwin.h>
  37. #endif

  39. #ifdef __CYGWIN__
  40. ‌static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";
  41. #elif defined(__sun__) || defined(linux)
  42. ‌static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";
  43. #else
  44. ‌static char default_nto_target[] = "";
  45. #endif

  47. ‌struct nto_target_ops current_nto_target;

  49. static char *
  50. ‌nto_target (void)
  51. {
  52.   char *p = getenv ("QNX_TARGET");

  54. #ifdef __CYGWIN__
  55.   static char buf[PATH_MAX];
  56.   if (p)
  57.     cygwin_conv_path (CCP_WIN_A_TO_POSIX, p, buf, PATH_MAX);
  58.   else
  59.     cygwin_conv_path (CCP_WIN_A_TO_POSIX, default_nto_target, buf, PATH_MAX);
  60.   return buf;
  61. #else
  62.   return p ? p : default_nto_target;
  63. #endif
  64. }

  66. /* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
  67.    CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
  68. int
  69. ‌nto_map_arch_to_cputype (const char *arch)
  70. {
  71.   if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
  72.     return CPUTYPE_X86;
  73.   if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))
  74.     return CPUTYPE_PPC;
  75.   if (!strcmp (arch, "mips"))
  76.     return CPUTYPE_MIPS;
  77.   if (!strcmp (arch, "arm"))
  78.     return CPUTYPE_ARM;
  79.   if (!strcmp (arch, "sh"))
  80.     return CPUTYPE_SH;
  81.   return CPUTYPE_UNKNOWN;
  82. }

  84. int
  85. ‌nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname)
  86. {
  87.   char *buf, *arch_path, *nto_root, *endian;
  88.   const char *base;
  89.   const char *arch;
  90.   int arch_len, len, ret;
  91. ‌#define PATH_FMT \
  92.   "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"

  94.   nto_root = nto_target ();
  95.   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
  96.     {
  97.       arch = "x86";
  98.       endian = "";
  99.     }
  100.   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
  101.                    "rs6000") == 0
  102.            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
  103.                    "powerpc") == 0)
  104.     {
  105.       arch = "ppc";
  106.       endian = "be";
  107.     }
  108.   else
  109.     {
  110.       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
  111.       endian = gdbarch_byte_order (target_gdbarch ())
  112.                == BFD_ENDIAN_BIG ? "be" : "le";
  113.     }

  115.   /* In case nto_root is short, add strlen(solib)
  116.      so we can reuse arch_path below.  */

  118.   arch_len = (strlen (nto_root) + strlen (arch) + strlen (endian) + 2
  119.               + strlen (solib));
  120.   arch_path = alloca (arch_len);
  121.   xsnprintf (arch_path, arch_len, "%s/%s%s", nto_root, arch, endian);

  123.   len = strlen (PATH_FMT) + strlen (arch_path) * 5 + 1;
  124.   buf = alloca (len);
  125.   xsnprintf (buf, len, PATH_FMT, arch_path, arch_path, arch_path, arch_path,
  126.              arch_path);

  128.   base = lbasename (solib);
  129.   ret = openp (buf, OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, base, o_flags,
  130.                temp_pathname);
  131.   if (ret < 0 && base != solib)
  132.     {
  133.       xsnprintf (arch_path, arch_len, "/%s", solib);
  134.       ret = open (arch_path, o_flags, 0);
  135.       if (temp_pathname)
  136.         {
  137.           if (ret >= 0)
  138.             *temp_pathname = gdb_realpath (arch_path);
  139.           else
  140.             *temp_pathname = NULL;
  141.         }
  142.     }
  143.   return ret;
  144. }

  146. void
  147. ‌nto_init_solib_absolute_prefix (void)
  148. {
  149.   char buf[PATH_MAX * 2], arch_path[PATH_MAX];
  150.   char *nto_root, *endian;
  151.   const char *arch;

  153.   nto_root = nto_target ();
  154.   if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name, "i386") == 0)
  155.     {
  156.       arch = "x86";
  157.       endian = "";
  158.     }
  159.   else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
  160.                    "rs6000") == 0
  161.            || strcmp (gdbarch_bfd_arch_info (target_gdbarch ())->arch_name,
  162.                    "powerpc") == 0)
  163.     {
  164.       arch = "ppc";
  165.       endian = "be";
  166.     }
  167.   else
  168.     {
  169.       arch = gdbarch_bfd_arch_info (target_gdbarch ())->arch_name;
  170.       endian = gdbarch_byte_order (target_gdbarch ())
  171.                == BFD_ENDIAN_BIG ? "be" : "le";
  172.     }

  174.   xsnprintf (arch_path, sizeof (arch_path), "%s/%s%s", nto_root, arch, endian);

  176.   xsnprintf (buf, sizeof (buf), "set solib-absolute-prefix %s", arch_path);
  177.   execute_command (buf, 0);
  178. }

  180. char **
  181. ‌nto_parse_redirection (char *pargv[], const char **pin, const char **pout,
  182.                        const char **perr)
  183. {
  184.   char **argv;
  185.   char *in, *out, *err, *p;
  186.   int argc, i, n;

  188.   for (n = 0; pargv[n]; n++);
  189.   if (n == 0)
  190.     return NULL;
  191.   in = "";
  192.   out = "";
  193.   err = "";

  195.   argv = xcalloc (n + 1, sizeof argv[0]);
  196.   argc = n;
  197.   for (i = 0, n = 0; n < argc; n++)
  198.     {
  199.       p = pargv[n];
  200.       if (*p == '>')
  201.         {
  202.           p++;
  203.           if (*p)
  204.             out = p;
  205.           else
  206.             out = pargv[++n];
  207.         }
  208.       else if (*p == '<')
  209.         {
  210.           p++;
  211.           if (*p)
  212.             in = p;
  213.           else
  214.             in = pargv[++n];
  215.         }
  216.       else if (*p++ == '2' && *p++ == '>')
  217.         {
  218.           if (*p == '&' && *(p + 1) == '1')
  219.             err = out;
  220.           else if (*p)
  221.             err = p;
  222.           else
  223.             err = pargv[++n];
  224.         }
  225.       else
  226.         argv[i++] = pargv[n];
  227.     }
  228.   *pin = in;
  229.   *pout = out;
  230.   *perr = err;
  231.   return argv;
  232. }

  234. /* The struct lm_info, lm_addr, and nto_truncate_ptr are copied from
  235.    solib-svr4.c to support nto_relocate_section_addresses
  236.    which is different from the svr4 version.  */

  238. /* Link map info to include in an allocated so_list entry */

  240. ‌struct lm_info
  241.   {
  242.     /* Pointer to copy of link map from inferior.  The type is char *
  243.        rather than void *, so that we may use byte offsets to find the
  244.        various fields without the need for a cast.  */
  245.     gdb_byte *lm;

  247.     /* Amount by which addresses in the binary should be relocated to
  248.        match the inferior.  This could most often be taken directly
  249.        from lm, but when prelinking is involved and the prelink base
  250.        address changes, we may need a different offset, we want to
  251.        warn about the difference and compute it only once.  */
  252.     CORE_ADDR l_addr;

  254.     /* The target location of lm.  */
  255.     CORE_ADDR lm_addr;
  256.   };


  259. static CORE_ADDR
  260. ‌lm_addr (struct so_list *so)
  261. {
  262.   if (so->lm_info->l_addr == (CORE_ADDR)-1)
  263.     {
  264.       struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
  265.       struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;

  267.       so->lm_info->l_addr =
  268.         extract_typed_address (so->lm_info->lm + lmo->l_addr_offset, ptr_type);
  269.     }
  270.   return so->lm_info->l_addr;
  271. }

  273. static CORE_ADDR
  274. ‌nto_truncate_ptr (CORE_ADDR addr)
  275. {
  276.   if (gdbarch_ptr_bit (target_gdbarch ()) == sizeof (CORE_ADDR) * 8)
  277.     /* We don't need to truncate anything, and the bit twiddling below
  278.        will fail due to overflow problems.  */
  279.     return addr;
  280.   else
  281.     return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch ())) - 1);
  282. }

  284. static Elf_Internal_Phdr *
  285. ‌find_load_phdr (bfd *abfd)
  286. {
  287.   Elf_Internal_Phdr *phdr;
  288.   unsigned int i;

  290.   if (!elf_tdata (abfd))
  291.     return NULL;

  293.   phdr = elf_tdata (abfd)->phdr;
  294.   for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
  295.     {
  296.       if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
  297.         return phdr;
  298.     }
  299.   return NULL;
  300. }

  302. void
  303. ‌nto_relocate_section_addresses (struct so_list *so, struct target_section *sec)
  304. {
  305.   /* Neutrino treats the l_addr base address field in link.h as different than
  306.      the base address in the System V ABI and so the offset needs to be
  307.      calculated and applied to relocations.  */
  308.   Elf_Internal_Phdr *phdr = find_load_phdr (sec->the_bfd_section->owner);
  309.   unsigned vaddr = phdr ? phdr->p_vaddr : 0;

  311.   sec->addr = nto_truncate_ptr (sec->addr + lm_addr (so) - vaddr);
  312.   sec->endaddr = nto_truncate_ptr (sec->endaddr + lm_addr (so) - vaddr);
  313. }

  315. /* This is cheating a bit because our linker code is in libc.so.  If we
  316.    ever implement lazy linking, this may need to be re-examined.  */
  317. int
  318. ‌nto_in_dynsym_resolve_code (CORE_ADDR pc)
  319. {
  320.   if (in_plt_section (pc))
  321.     return 1;
  322.   return 0;
  323. }

  325. void
  326. ‌nto_dummy_supply_regset (struct regcache *regcache, char *regs)
  327. {
  328.   /* Do nothing.  */
  329. }

  331. enum gdb_osabi
  332. ‌nto_elf_osabi_sniffer (bfd *abfd)
  333. {
  334.   if (nto_is_nto_target)
  335.     return nto_is_nto_target (abfd);
  336.   return GDB_OSABI_UNKNOWN;
  337. }

  339. ‌static const char *nto_thread_state_str[] =
  340. {
  341.   "DEAD",                /* 0  0x00 */
  342.   "RUNNING",        /* 1  0x01 */
  343.   "READY",        /* 2  0x02 */
  344.   "STOPPED",        /* 3  0x03 */
  345.   "SEND",                /* 4  0x04 */
  346.   "RECEIVE",        /* 5  0x05 */
  347.   "REPLY",        /* 6  0x06 */
  348.   "STACK",        /* 7  0x07 */
  349.   "WAITTHREAD",        /* 8  0x08 */
  350.   "WAITPAGE",        /* 9  0x09 */
  351.   "SIGSUSPEND",        /* 10 0x0a */
  352.   "SIGWAITINFO",        /* 11 0x0b */
  353.   "NANOSLEEP",        /* 12 0x0c */
  354.   "MUTEX",        /* 13 0x0d */
  355.   "CONDVAR",        /* 14 0x0e */
  356.   "JOIN",                /* 15 0x0f */
  357.   "INTR",                /* 16 0x10 */
  358.   "SEM",                /* 17 0x11 */
  359.   "WAITCTX",        /* 18 0x12 */
  360.   "NET_SEND",        /* 19 0x13 */
  361.   "NET_REPLY"        /* 20 0x14 */
  362. };

  364. char *
  365. ‌nto_extra_thread_info (struct target_ops *self, struct thread_info *ti)
  366. {
  367.   if (ti && ti->private
  368.       && ti->private->state < ARRAY_SIZE (nto_thread_state_str))
  369.     return (char *)nto_thread_state_str [ti->private->state];
  370.   return "";
  371. }

  373. void
  374. ‌nto_initialize_signals (void)
  375. {
  376.   /* We use SIG45 for pulses, or something, so nostop, noprint
  377.      and pass them.  */
  378.   signal_stop_update (gdb_signal_from_name ("SIG45"), 0);
  379.   signal_print_update (gdb_signal_from_name ("SIG45"), 0);
  380.   signal_pass_update (gdb_signal_from_name ("SIG45"), 1);

  382.   /* By default we don't want to stop on these two, but we do want to pass.  */
  383. #if defined(SIGSELECT)
  384.   signal_stop_update (SIGSELECT, 0);
  385.   signal_print_update (SIGSELECT, 0);
  386.   signal_pass_update (SIGSELECT, 1);
  387. #endif

  389. #if defined(SIGPHOTON)
  390.   signal_stop_update (SIGPHOTON, 0);
  391.   signal_print_update (SIGPHOTON, 0);
  392.   signal_pass_update (SIGPHOTON, 1);
  393. #endif
  394. }