[PATCH] Support gcore on FreeBSD/386

[Mark Kettenis <kettenis at chello dot nl>]

Checked in, trunk only.

Hmm, I should probably add something to NEWS too.

Mark


Index: ChangeLog
from  Mark Kettenis  <kettenis@gnu.org>
	* fbsd-proc.c: New file.
	* config/i386/nm-fbsd.h (CHILD_PID_TO_EXEC_FILE): Define.
	* config/i386/fbsd.mh (NATDEPFILES): Add gcore.o and fbsd-proc.o.

Index: config/i386/nm-fbsd.h
===================================================================
RCS file: /cvs/src/src/gdb/config/i386/nm-fbsd.h,v
retrieving revision 1.5
diff -u -p -r1.5 nm-fbsd.h
--- config/i386/nm-fbsd.h 2001/07/21 20:16:44 1.5
+++ config/i386/nm-fbsd.h 2002/03/31 17:43:13
@@ -56,6 +56,9 @@ extern unsigned long i386bsd_dr_get_stat
 /* Override child_resume in `infptrace.c' to work around a kernel bug.  */
 #define CHILD_RESUME
 
+/* Override child_pid_to_exec_file in 'inftarg.c'.  */
+#define CHILD_PID_TO_EXEC_FILE
+
 /* We can attach and detach.  */
 #define ATTACH_DETACH
 
Index: config/i386/fbsd.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/i386/fbsd.mh,v
retrieving revision 1.10
diff -u -p -r1.10 fbsd.mh
--- config/i386/fbsd.mh 2002/01/18 04:50:59 1.10
+++ config/i386/fbsd.mh 2002/03/31 17:43:13
@@ -4,4 +4,4 @@ XM_FILE= xm-i386.h
 
 NAT_FILE= nm-fbsd.h
 # NOTE: Do not spread NATDEPFILES over several lines - it hurts BSD make.
-NATDEPFILES= fork-child.o infptrace.o inftarg.o solib.o solib-svr4.o solib-legacy.o corelow.o core-aout.o core-regset.o i386-nat.o i387-nat.o i386bsd-nat.o i386fbsd-nat.o
+NATDEPFILES= fork-child.o infptrace.o inftarg.o solib.o solib-svr4.o solib-legacy.o corelow.o core-aout.o core-regset.o i386-nat.o i387-nat.o i386bsd-nat.o i386fbsd-nat.o gcore.o fbsd-proc.o
--- /dev/null	Sun Mar 31 19:36:44 2002
+++ fbsd-proc.c	Sun Mar 31 19:40:10 2002
@@ -0,0 +1,173 @@
+/* FreeBSD-specific methods for using the /proc file system.
+   Copyright 2002 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 "gdbcore.h"
+#include "inferior.h"
+
+#include <sys/procfs.h>
+#include <sys/types.h>
+
+#include "elf-bfd.h"
+
+#include "gregset.h"
+
+char *
+child_pid_to_exec_file (int pid)
+{
+  char *path;
+  char *buf;
+
+  asprintf (&path, "/proc/%d/file", pid);
+  buf = xcalloc (MAXPATHLEN, sizeof (char));
+  make_cleanup (xfree, path);
+  make_cleanup (xfree, buf);
+
+  if (readlink (path, buf, MAXPATHLEN) > 0)
+    return buf;
+
+  return NULL;
+}
+
+static int
+read_mapping (FILE *mapfile,
+	      unsigned long *start,
+	      unsigned long *end,
+	      char *protection)
+{
+  int resident, privateresident;
+  unsigned long obj;
+  int ref_count, shadow_count;
+  unsigned flags;
+  char cow[5], access[4];
+  char type[8];
+  int ret;
+
+  /* The layout is described in /usr/src/miscfs/procfs/procfs_map.c.  */
+  ret = fscanf (mapfile, "%lx %lx %d %d %lx %s %d %d %x %s %s %s\n",
+		start, end,
+		&resident, &privateresident, &obj,
+		protection,
+		&ref_count, &shadow_count, &flags, cow, access, type);
+
+  return (ret != 0 && ret != EOF);
+}
+
+static int
+fbsd_find_memory_regions (int (*func) (CORE_ADDR,
+				       unsigned long,
+				       int, int, int,
+				       void *),
+			  void *obfd)
+{
+  pid_t pid = ptid_get_pid (inferior_ptid);
+  char *mapfilename;
+  FILE *mapfile;
+  unsigned long start, end, size;
+  char protection[4];
+  int read, write, exec;
+
+  asprintf (&mapfilename, "/proc/%ld/map", (long) pid);
+  mapfile = fopen (mapfilename, "r");
+  if (mapfile == NULL)
+    error ("Couldn't open %s\n", mapfilename);
+
+  if (info_verbose)
+    fprintf_filtered (gdb_stdout, 
+		      "Reading memory regions from %s\n", mapfilename);
+
+  /* Now iterate until end-of-file.  */
+  while (read_mapping (mapfile, &start, &end, &protection[0]))
+    {
+      size = end - start;
+
+      read = (strchr (protection, 'r') != 0);
+      write = (strchr (protection, 'w') != 0);
+      exec = (strchr (protection, 'x') != 0);
+
+      if (info_verbose)
+	{
+	  fprintf_filtered (gdb_stdout, 
+			    "Save segment, %ld bytes at 0x%s (%c%c%c)\n", 
+			    size, paddr_nz (start),
+			    read ? 'r' : '-',
+			    write ? 'w' : '-',
+			    exec ? 'x' : '-');
+	}
+
+      /* Invoke the callback function to create the corefile segment. */
+      func (start, size, read, write, exec, obfd);
+    }
+
+  fclose (mapfile);
+  return 0;
+}
+
+static char *
+fbsd_make_corefile_notes (bfd *obfd, int *note_size)
+{
+  gregset_t gregs;
+  fpregset_t fpregs;
+  char *note_data = NULL;
+
+  fill_gregset (&gregs, -1);
+  note_data = (char *) elfcore_write_prstatus (obfd,
+					       note_data,
+					       note_size,
+					       ptid_get_pid (inferior_ptid),
+					       stop_signal,
+					       &gregs);
+
+  fill_fpregset (&fpregs, -1);
+  note_data = (char *) elfcore_write_prfpreg (obfd,
+					      note_data,
+					      note_size,
+					      &fpregs,
+					      sizeof (fpregs));
+
+  if (get_exec_file (0))
+    {
+      char *fname = strrchr (get_exec_file (0), '/') + 1;
+      char *psargs = strdup (fname);
+
+      if (get_inferior_args ())
+	psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);
+
+      note_data = (char *) elfcore_write_prpsinfo (obfd,
+						   note_data,
+						   note_size,
+						   fname,
+						   psargs);
+    }
+
+  make_cleanup (xfree, note_data);
+  return note_data;
+}
+
+
+void
+_initialize_fbsd_proc (void)
+{
+  extern void inftarg_set_find_memory_regions ();
+  extern void inftarg_set_make_corefile_notes ();
+
+  inftarg_set_find_memory_regions (fbsd_find_memory_regions);
+  inftarg_set_make_corefile_notes (fbsd_make_corefile_notes);
+}