Unify ptrace options discovery code and make both GDB and

	gdbserver use it.

	gdb/
	* Makefile.in (HFILES_NO_SRCDIR): Add nat/linux-nat.h and
	nat/linux-waitpid.h.
	(linux-waitpid.o): New object file rule.
	* common/linux-ptrace.c: Include nat/linux-waitpid.h.
	(current_ptrace_options): Moved from linux-nat.c.
	(linux_ptrace_test_ret_to_nx): Use type casts for ptrace
	parameters.
	(linux_fork_to_function): New function.
	(linux_grandchild_function): Likewise.
	(linux_child_function): Likewise.
	(linux_check_ptrace_features): New function, heavily
	based on linux-nat.c:linux_test_for_tracefork.
	(linux_enable_event_reporting): New function.
	(ptrace_supports_feature): Likewise.
	(linux_supports_tracefork): Likewise.
	(linux_supports_traceclone): Likewise.
	(linux_supports_tracevforkdone): Likewise.
	(linux_supports_tracesysgood): Likewise.
	* common/linux-ptrace.h (HAS_NOMMU): Moved from
	gdbserver/linux-low.c.
	(linux_enable_event_reporting): New declaration.
	(linux_supports_tracefork): Likewise.
	(linux_supports_traceclone): Likewise.
	(linux_supports_tracevforkdone): Likewise.
	(linux_supports_tracesysgood): Likewise.
	* config.in (PTRACE_TYPE_ARG4): Regenerate.
	* config/aarch64/linux.mh (NATDEPFILES): Add linux-waitpid.o.
	* config/alpha/alpha-linux.mh (NATDEPFILES): Likewise.
	* config/arm/linux.mh (NATDEPFILES): Likewise.
	* config/i386/linux.mh (NATDEPFILES): Likewise.
	* config/i386/linux64.mh (NATDEPFILES): Likewise.
	* config/ia64/linux.mh (NATDEPFILES): Likewise.
	* config/m32r/linux.mh (NATDEPFILES): Likewise.
	* config/m68k/linux.mh (NATDEPFILES): Likewise.
	* config/mips/linux.mh (NATDEPFILES): Likewise.
	* config/pa/linux.mh (NATDEPFILES): Likewise..
	* config/powerpc/linux.mh (NATDEPFILES): Likewise..
	* config/powerpc/ppc64-linux.mh (NATDEPFILES): Likewise.
	* config/powerpc/spu-linux.mh (NATDEPFILES): Likewise.
	* config/sparc/linux.mh (NATDEPFILES): Likewise.
	* config/sparc/linux64.mh (NATDEPFILES): Likewise.
	* config/tilegx/linux.mh (NATDEPFILES): Likewise.
	* config/xtensa/linux.mh (NATDEPFILES): Likewise.
	* configure.ac (AC_CACHE_CHECK): Add void * to the list of
	ptrace's 4th argument's types.
	Check the type of PTRACE_TYPE_ARG4.
	* configure: Regenerate.
	* linux-nat.c: Include nat/linux-nat.h and nat/linux-waitpid.h.
	(SYSCALL_SIGTRAP): Moved to nat/linux-nat.h.
	(linux_supports_tracefork_flag): Remove.
	(linux_supports_tracesysgood_flag): Likewise.
	(linux_supports_tracevforkdone_flag): Likewise.
	(current_ptrace_options): Moved to
	common/linux-ptrace.c.
	(linux_tracefork_child): Remove.
	(my_waitpid): Remove.
	(linux_test_for_tracefork): Renamed to
	linux_check_ptrace_features and moved to common/linux-ptrace.c.
	(linux_test_for_tracesysgood): Remove.
	(linux_supports_tracesysgood): Remove.
	(linux_supports_tracefork): Remove.
	(linux_supports_tracevforkdone): Remove.
	(linux_enable_tracesysgood): Remove.
	(linux_enable_event_reporting): Remove.
	(linux_init_ptrace): New function.
	(linux_child_post_attach): Call linux_init_ptrace.
	(linux_child_post_startup_inferior): Call linux_init_ptrace.
	(linux_child_follow_fork): Call linux_supports_tracefork
	and linux_supports_tracevforkdone.
	(linux_child_insert_fork_catchpoint): Call
	linux_supports_tracefork.
	(linux_child_insert_vfork_catchpoint): Likewise.
	(linux_child_set_syscall_catchpoint): Call
	linux_supports_tracesysgood.
	(lin_lwp_attach_lwp): Call linux_supports_tracefork.
	* nat/linux-nat.h: New file.
	* nat/linux-waitpid.c: New file.
	* nat/linux-waitpid.h: New file.

	gdb/gdbserver/
	* Makefile.in: Explain why ../target and ../nat are not
	listed as include file search paths.
	(linux-waitpid.o): New object file rule.
	* configure.srv (srv_native_linux_obj): New variable.
	Replace all occurrences of linux native object files with
	$srv_native_linux_obj.
	* linux-low.c: Include nat/linux-nat.h and nat/linux-waitpid.h.
	(HAS_NOMMU): Move defining logic to common/linux-ptrace.c.
	(linux_enable_event_reporting): Remove declaration.
	(my_waitpid): Moved to common/linux-waitpid.c.
	(linux_wait_for_event): Pass ptid when calling
	linux_enable_event_reporting.
	(linux_supports_tracefork_flag): Remove.
	(linux_enable_event_reporting): Likewise.
	(linux_tracefork_grandchild): Remove.
	(STACK_SIZE): Moved to common/linux-ptrace.c.
	(linux_tracefork_child): Remove.
	(linux_test_for_tracefork): Remove.
	(linux_look_up_symbols): Call linux_supports_traceclone.
	(initialize_low): Remove call to linux_test_for_tracefork.
	* linux-low.h (PTRACE_TYPE_ARG3): Move to
	common/linux-ptrace.h.
	(PTRACE_TYPE_ARG4): Likewise.
	Include linux-ptrace.h.

3 files changed, 175 insertions, 0 deletions

diff --git a/gdb/nat/linux-nat.h b/gdb/nat/linux-nat.h
new file mode 100644
index 00000000000..4d84aa555a5
--- /dev/null
+++ b/gdb/nat/linux-nat.h
@@ -0,0 +1,28 @@
+/* Code for native debugging support for GNU/Linux (LWP layer).
+
+   Copyright (C) 2000-2013 Free Software Foundation, Inc.
+
+   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/>.  */
+
+#ifndef LINUX_NAT_H
+#define LINUX_NAT_H
+
+/* Unlike other extended result codes, WSTOPSIG (status) on
+   PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
+   instead SIGTRAP with bit 7 set.  */
+#define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
+
+#endif /* LINUX_NAT_H */
diff --git a/gdb/nat/linux-waitpid.c b/gdb/nat/linux-waitpid.c
new file mode 100644
index 00000000000..2debea48875
--- /dev/null
+++ b/gdb/nat/linux-waitpid.c
@@ -0,0 +1,120 @@
+/* Wrapper implementation for waitpid for GNU/Linux (LWP layer).
+
+   Copyright (C) 2001-2013 Free Software Foundation, Inc.
+
+   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/>.  */
+
+#ifdef GDBSERVER
+#include "server.h"
+#else
+#include "defs.h"
+#include "signal.h"
+#endif
+
+#include "nat/linux-nat.h"
+#include "nat/linux-waitpid.h"
+#include "gdb_wait.h"
+
+/* Print debugging output based on the format string FORMAT and
+   its parameters.  */
+
+static inline void
+linux_debug (const char *format, ...)
+{
+#ifdef GDBSERVER
+  if (debug_threads)
+    {
+      va_list args;
+      va_start (args, format);
+      vfprintf (stderr, format, args);
+      fprintf (stderr, "\n");
+      va_end (args);
+    }
+#else
+  /* GDB-specific debugging output.  */
+#endif
+}
+
+/* Wrapper function for waitpid which handles EINTR, and emulates
+   __WALL for systems where that is not available.  */
+
+int
+my_waitpid (int pid, int *status, int flags)
+{
+  int ret, out_errno;
+
+  linux_debug ("my_waitpid (%d, 0x%x)\n", pid, flags);
+
+  if (flags & __WALL)
+    {
+      sigset_t block_mask, org_mask, wake_mask;
+      int wnohang;
+
+      wnohang = (flags & WNOHANG) != 0;
+      flags &= ~(__WALL | __WCLONE);
+      flags |= WNOHANG;
+
+      /* Block all signals while here.  This avoids knowing about
+	 LinuxThread's signals.  */
+      sigfillset (&block_mask);
+      sigprocmask (SIG_BLOCK, &block_mask, &org_mask);
+
+      /* ... except during the sigsuspend below.  */
+      sigemptyset (&wake_mask);
+
+      while (1)
+	{
+	  /* Since all signals are blocked, there's no need to check
+	     for EINTR here.  */
+	  ret = waitpid (pid, status, flags);
+	  out_errno = errno;
+
+	  if (ret == -1 && out_errno != ECHILD)
+	    break;
+	  else if (ret > 0)
+	    break;
+
+	  if (flags & __WCLONE)
+	    {
+	      /* We've tried both flavors now.  If WNOHANG is set,
+		 there's nothing else to do, just bail out.  */
+	      if (wnohang)
+		break;
+
+	      linux_debug ("blocking\n");
+
+	      /* Block waiting for signals.  */
+	      sigsuspend (&wake_mask);
+	    }
+	  flags ^= __WCLONE;
+	}
+
+      sigprocmask (SIG_SETMASK, &org_mask, NULL);
+    }
+  else
+    {
+      do
+	ret = waitpid (pid, status, flags);
+      while (ret == -1 && errno == EINTR);
+      out_errno = errno;
+    }
+
+  linux_debug ("my_waitpid (%d, 0x%x): status(%x), %d\n",
+	       pid, flags, status ? *status : -1, ret);
+
+  errno = out_errno;
+  return ret;
+}
diff --git a/gdb/nat/linux-waitpid.h b/gdb/nat/linux-waitpid.h
new file mode 100644
index 00000000000..0df29d8ef5c
--- /dev/null
+++ b/gdb/nat/linux-waitpid.h
@@ -0,0 +1,27 @@
+/* Wrapper for waitpid for GNU/Linux (LWP layer).
+
+   Copyright (C) 2000-2013 Free Software Foundation, Inc.
+
+   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/>.  */
+
+#ifndef LINUX_WAITPID_H
+#define LINUX_WAITPID_H
+
+/* Wrapper function for waitpid which handles EINTR, and emulates
+   __WALL for systems where that is not available.  */
+extern int my_waitpid (int pid, int *status, int flags);
+
+#endif /* LINUX_WAITPID_H */