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

   Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by QNX Software Systems Ltd.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "gdb_stat.h"

#include "gdb_string.h"

#include "nto-tdep.h"

#include "top.h"

#include "cli/cli-decode.h"

#include "cli/cli-cmds.h"

#include "inferior.h"

#include "gdbarch.h"

#include "bfd.h"

#include "elf-bfd.h"

#include "solib-svr4.h"

#include "gdbcore.h"

#include "objfiles.h"

#include <string.h>

#ifdef __CYGWIN__

#include <sys/cygwin.h>

#endif

#ifdef __CYGWIN__

static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";

#elif defined(__sun__) || defined(linux)

static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";

#else

static char default_nto_target[] = "";

#endif

struct nto_target_ops current_nto_target;

static char *

nto_target (void)

{

  char *p = getenv ("QNX_TARGET");

#ifdef __CYGWIN__

  static char buf[PATH_MAX];

  if (p)

    cygwin_conv_to_posix_path (p, buf);

  else

    cygwin_conv_to_posix_path (default_nto_target, buf);

  return buf;

#else

  return p ? p : default_nto_target;

#endif

}

/* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,

   CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */

int

nto_map_arch_to_cputype (const char *arch)

{

  if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))

    return CPUTYPE_X86;

  if (!strcmp (arch, "rs6000") || !strcmp (arch, "powerpc"))

    return CPUTYPE_PPC;

  if (!strcmp (arch, "mips"))

    return CPUTYPE_MIPS;

  if (!strcmp (arch, "arm"))

    return CPUTYPE_ARM;

  if (!strcmp (arch, "sh"))

    return CPUTYPE_SH;

  return CPUTYPE_UNKNOWN;

}

int

nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname)

{

  char *buf, *arch_path, *nto_root, *endian, *base;

  const char *arch;

  int ret;

#define PATH_FMT "%s/lib:%s/usr/lib:%s/usr/photon/lib:%s/usr/photon/dll:%s/lib/dll"

  nto_root = nto_target ();

  if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, "i386") == 0)

    {

      arch = "x86";

      endian = "";

    }

  else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name,

                   "rs6000") == 0

           || strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name,

                   "powerpc") == 0)

    {

      arch = "ppc";

      endian = "be";

    }

  else

    {

      arch = gdbarch_bfd_arch_info (target_gdbarch)->arch_name;

      endian = gdbarch_byte_order (target_gdbarch)

               == BFD_ENDIAN_BIG ? "be" : "le";

    }

  /* In case nto_root is short, add strlen(solib)

     so we can reuse arch_path below.  */

  arch_path =

    alloca (strlen (nto_root) + strlen (arch) + strlen (endian) + 2 +

            strlen (solib));

  sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);

  buf = alloca (strlen (PATH_FMT) + strlen (arch_path) * 5 + 1);

  sprintf (buf, PATH_FMT, arch_path, arch_path, arch_path, arch_path,

           arch_path);

  /* Don't assume basename() isn't destructive.  */

  base = strrchr (solib, '/');

  if (!base)

    base = solib;

  else

    base++;                     /* Skip over '/'.  */

  ret = openp (buf, 1, base, o_flags, temp_pathname);

  if (ret < 0 && base != solib)

    {

      sprintf (arch_path, "/%s", solib);

      ret = open (arch_path, o_flags, 0);

      if (temp_pathname)

        {

          if (ret >= 0)

            *temp_pathname = gdb_realpath (arch_path);

          else

            **temp_pathname = '\0';

        }

    }

  return ret;

}

void

nto_init_solib_absolute_prefix (void)

{

  char buf[PATH_MAX * 2], arch_path[PATH_MAX];

  char *nto_root, *endian;

  const char *arch;

  nto_root = nto_target ();

  if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name, "i386") == 0)

    {

      arch = "x86";

      endian = "";

    }

  else if (strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name,

                   "rs6000") == 0

           || strcmp (gdbarch_bfd_arch_info (target_gdbarch)->arch_name,

                   "powerpc") == 0)

    {

      arch = "ppc";

      endian = "be";

    }

  else

    {

      arch = gdbarch_bfd_arch_info (target_gdbarch)->arch_name;

      endian = gdbarch_byte_order (target_gdbarch)

               == BFD_ENDIAN_BIG ? "be" : "le";

    }

  sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);

  sprintf (buf, "set solib-absolute-prefix %s", arch_path);

  execute_command (buf, 0);

}

char **

nto_parse_redirection (char *pargv[], const char **pin, const char **pout,

                       const char **perr)

{

  char **argv;

  char *in, *out, *err, *p;

  int argc, i, n;

  for (n = 0; pargv[n]; n++);

  if (n == 0)

    return NULL;

  in = "";

  out = "";

  err = "";

  argv = xcalloc (n + 1, sizeof argv[0]);

  argc = n;

  for (i = 0, n = 0; n < argc; n++)

    {

      p = pargv[n];

      if (*p == '>')

        {

          p++;

          if (*p)

            out = p;

          else

            out = pargv[++n];

        }

      else if (*p == '<')

        {

          p++;

          if (*p)

            in = p;

          else

            in = pargv[++n];

        }

      else if (*p++ == '2' && *p++ == '>')

        {

          if (*p == '&' && *(p + 1) == '1')

            err = out;

          else if (*p)

            err = p;

          else

            err = pargv[++n];

        }

      else

        argv[i++] = pargv[n];

    }

  *pin = in;

  *pout = out;

  *perr = err;

  return argv;

}

/* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from

   solib-svr4.c to support nto_relocate_section_addresses

   which is different from the svr4 version.  */

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

struct lm_info

  {

    /* Pointer to copy of link map from inferior.  The type is char *

       rather than void *, so that we may use byte offsets to find the

       various fields without the need for a cast.  */

    gdb_byte *lm;

    /* Amount by which addresses in the binary should be relocated to

       match the inferior.  This could most often be taken directly

       from lm, but when prelinking is involved and the prelink base

       address changes, we may need a different offset, we want to

       warn about the difference and compute it only once.  */

    CORE_ADDR l_addr;

    /* The target location of lm.  */

    CORE_ADDR lm_addr;

  };

static CORE_ADDR

LM_ADDR (struct so_list *so)

{

  if (so->lm_info->l_addr == (CORE_ADDR)-1)

    {

      struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();

      struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;

      so->lm_info->l_addr =

        extract_typed_address (so->lm_info->lm + lmo->l_addr_offset, ptr_type);

    }

  return so->lm_info->l_addr;

}

static CORE_ADDR

nto_truncate_ptr (CORE_ADDR addr)

{

  if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8)

    /* We don't need to truncate anything, and the bit twiddling below

       will fail due to overflow problems.  */

    return addr;

  else

    return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1);

}

static Elf_Internal_Phdr *

find_load_phdr (bfd *abfd)

{

  Elf_Internal_Phdr *phdr;

  unsigned int i;

  if (!elf_tdata (abfd))

    return NULL;

  phdr = elf_tdata (abfd)->phdr;

  for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)

    {

      if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))

        return phdr;

    }

  return NULL;

}

void

nto_relocate_section_addresses (struct so_list *so, struct target_section *sec)

{

  /* Neutrino treats the l_addr base address field in link.h as different than

     the base address in the System V ABI and so the offset needs to be

     calculated and applied to relocations.  */

  Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);

  unsigned vaddr = phdr ? phdr->p_vaddr : 0;

  sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);

  sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);

}

/* This is cheating a bit because our linker code is in libc.so.  If we

   ever implement lazy linking, this may need to be re-examined.  */

int

nto_in_dynsym_resolve_code (CORE_ADDR pc)

{

  if (in_plt_section (pc, NULL))

    return 1;

  return 0;

}

void

nto_dummy_supply_regset (struct regcache *regcache, char *regs)

{

  /* Do nothing.  */

}

enum gdb_osabi

nto_elf_osabi_sniffer (bfd *abfd)

{

  if (nto_is_nto_target)

    return nto_is_nto_target (abfd);

  return GDB_OSABI_UNKNOWN;

}

static const char *nto_thread_state_str[] =

{

  "DEAD",               /* 0  0x00 */

  "RUNNING",    /* 1  0x01 */

  "READY",      /* 2  0x02 */

  "STOPPED",    /* 3  0x03 */

  "SEND",               /* 4  0x04 */

  "RECEIVE",    /* 5  0x05 */

  "REPLY",      /* 6  0x06 */

  "STACK",      /* 7  0x07 */

  "WAITTHREAD", /* 8  0x08 */

  "WAITPAGE",   /* 9  0x09 */

  "SIGSUSPEND", /* 10 0x0a */

  "SIGWAITINFO",        /* 11 0x0b */

  "NANOSLEEP",  /* 12 0x0c */

  "MUTEX",      /* 13 0x0d */

  "CONDVAR",    /* 14 0x0e */

  "JOIN",               /* 15 0x0f */

  "INTR",               /* 16 0x10 */

  "SEM",                /* 17 0x11 */

  "WAITCTX",    /* 18 0x12 */

  "NET_SEND",   /* 19 0x13 */

  "NET_REPLY"   /* 20 0x14 */

};

char *

nto_extra_thread_info (struct thread_info *ti)

{

  if (ti && ti->private

      && ti->private->state < ARRAY_SIZE (nto_thread_state_str))

    return (char *)nto_thread_state_str [ti->private->state];

  return "";

}

void

nto_initialize_signals (void)

{

  /* We use SIG45 for pulses, or something, so nostop, noprint

     and pass them.  */

  signal_stop_update (target_signal_from_name ("SIG45"), 0);

  signal_print_update (target_signal_from_name ("SIG45"), 0);

  signal_pass_update (target_signal_from_name ("SIG45"), 1);

  /* By default we don't want to stop on these two, but we do want to pass.  */

#if defined(SIGSELECT)

  signal_stop_update (SIGSELECT, 0);

  signal_print_update (SIGSELECT, 0);

  signal_pass_update (SIGSELECT, 1);

#endif

#if defined(SIGPHOTON)

  signal_stop_update (SIGPHOTON, 0);

  signal_print_update (SIGPHOTON, 0);

  signal_pass_update (SIGPHOTON, 1);

#endif

}

/* Provide a prototype to silence -Wmissing-prototypes.  */

extern initialize_file_ftype _initialize_nto_tdep;

void

_initialize_nto_tdep (void)

{

  add_setshow_zinteger_cmd ("nto-debug", class_maintenance,

                            &nto_internal_debugging, _("\

Set QNX NTO internal debugging."), _("\

Show QNX NTO internal debugging."), _("\

When non-zero, nto specific debug info is\n\

displayed. Different information is displayed\n\

for different positive values."),

                            NULL,

                            NULL, /* FIXME: i18n: QNX NTO internal debugging is %s.  */

                            &setdebuglist, &showdebuglist);

}