* i386bsd-nat.c: Do not include <sys/sysctl.h>.

(_initialize_i386bsd_nat) [KERN_PS_STRINGS]: Move FreeBSD-specific
code to ...
* i386fbsd-nat.c: ... here.  New file.
* config/i386/fbsd.mh (NATDEPFILES): Add i386-fbsd.o.
* config/i386/nm-fbsd.h (CHILD_RESUME): Define.
* Makefile.in (ALLDEPFILES): Add i386fbsd-nat.c.
(i386fbsd-nat.o): Add dependencies.

1 files changed, 102 insertions, 0 deletions

diff --git a/gdb/i386fbsd-nat.c b/gdb/i386fbsd-nat.c
new file mode 100644
index 00000000000..1c19ac87eb4
--- /dev/null
+++ b/gdb/i386fbsd-nat.c
@@ -0,0 +1,102 @@
+/* Native-dependent code for FreeBSD/i386.
+   Copyright 2001 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "inferior.h"
+#include "regcache.h"
+
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <sys/sysctl.h>
+
+/* Prevent warning from -Wmissing-prototypes.  */
+void _initialize_i386fbsd_nat (void);
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+void
+child_resume (ptid_t ptid, int step, enum target_signal signal)
+{
+  pid_t pid = ptid_get_pid (ptid);
+  int request = PT_STEP;
+
+  if (pid == -1)
+    /* Resume all threads.  This only gets used in the non-threaded
+       case, where "resume all threads" and "resume inferior_ptid" are
+       the same.  */
+    pid = ptid_get_pid (inferior_ptid);
+
+  if (!step)
+    {
+      unsigned int eflags;
+
+      /* Workaround for a bug in FreeBSD.  Make sure that the trace
+ 	 flag is off when doing a continue.  There is a code path
+ 	 through the kernel which leaves the flag set when it should
+ 	 have been cleared.  If a process has a signal pending (such
+ 	 as SIGALRM) and we do a PT_STEP, the process never really has
+ 	 a chance to run because the kernel needs to notify the
+ 	 debugger that a signal is being sent.  Therefore, the process
+ 	 never goes through the kernel's trap() function which would
+ 	 normally clear it.  */
+
+      eflags = read_register (PS_REGNUM);
+      if (eflags & 0x0100)
+	write_register (PS_REGNUM, eflags & ~0x0100);
+
+      request = PT_CONTINUE;
+    }
+
+  /* An addres of (caddr_t) 1 tells ptrace to continue from where it
+     was.  (If GDB wanted it to start some other way, we have already
+     written a new PC value to the child.)  */
+  if (ptrace (request, pid, (caddr_t) 1,
+	      target_signal_to_host (signal)) == -1)
+    perror_with_name ("ptrace");
+}
+
+void
+_initialize_i386fbsd_nat (void)
+{
+  /* FreeBSD provides a kern.ps_strings sysctl that we can use to
+     locate the sigtramp.  That way we can still recognize a sigtramp
+     if it's location is changed in a new kernel.  Of course this is
+     still based on the assumption that the sigtramp is placed
+     directly under the location where the program arguments and
+     environment can be found.  */
+#ifdef KERN_PS_STRINGS
+  {
+    int mib[2];
+    int ps_strings;
+    size_t len;
+
+    mib[0] = CTL_KERN;
+    mib[1] = KERN_PS_STRINGS;
+    len = sizeof (ps_strings);
+    if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
+      {
+	i386bsd_sigtramp_start = ps_strings - 128;
+	i386bsd_sigtramp_end = ps_strings;
+      }
+  }
+#endif
+}