2009-02-06 Pedro Alves <pedro@codesourcery.com>

	gdb/
	* target.h (enum target_object): Add new TARGET_OBJECT_SIGNAL_INFO.
	* infrun.c (siginfo_value_read, siginfo_value_write): New.
	(siginfo_value_funcs): New.
	(siginfo_make_value): New.
	(_initialize_infrun): Create the $_siginfo convenience variable.
	* gdbtypes.h (append_composite_type_field_aligned): Declare.
	* gdbtypes.c (append_composite_type_field): Rename to...
	(append_composite_type_field_aligned): ... this.  Add ALIGNMENT
	argument.  Handle it.
	(append_composite_type_field): Rewrite on top of
	append_composite_type_field_aligned.
	* value.h (internalvar_make_value): New typedef.
	(struct internalvar) <make_value>: New field.
	(create_internalvar_type_lazy): Declare.
	* value.c (create_internalvar): Clear make_value.
	(create_internalvar_type_lazy): New.
	(value_of_internalvar): If make_value is set use it.
	(preserve_values): Skip internal variables that don't have a
	value.
	* gdbarch.sh (get_siginfo_type): New.
	* gdbarch.h, gdbarch.c: Regenerate.

	* linux-tdep.h, linux-tdep.c: New.
	* amd64-linux-tdep.c: Include "linux-tdep.h".
	(amd64_linux_init_abi): Register linux_get_siginfo_type and
	linux_get_siginfo_mapper.
	* i386-linux-tdep.c: Include "linux-tdep.h".
	(i386_linux_init_abi): Register linux_get_siginfo_type and
	linux_get_siginfo_mapper.
	* arm-linux-tdep.c: Include "linux-tdep.h".
	(i386_linux_init_abi): Register linux_get_siginfo_type and
	linux_get_siginfo_mapper.

	* linux-nat.c (linux_xfer_siginfo): New.
	(linux_nat_xfer_partial): Handle TARGET_OBJECT_SIGNAL_INFO.
	* remote.c (PACKET_qXfer_siginfo_read)
	(PACKET_qXfer_siginfo_write): New.
	(feature remote_protocol_features): Add "qXfer:siginfo:read" and
	"qXfer:siginfo:write" features.
	(remote_xfer_partial): Handle TARGET_OBJECT_SIGNAL_INFO.
	(_initialize_remote): Add "set/show remote read-siginfo-object"
	and "set/show remote write-siginfo-object" commands.

	* Makefile.in (ALL_TARGET_OBS): Add linux-tdep.o.
	(HFILES_NO_SRCDIR): Add linux-tdep.h.
	(ALLDEPFILES): Add linux-tdep.c.

	* configure.tgt (arm*-*-linux* | arm*-*-uclinux*)
	(i[34567]86-*-linux*, x86_64-*-linux*): Add linux-tdep.o to
	gdb_target_obs.

2009-02-06  Pedro Alves  <pedro@codesourcery.com>

	gdb/gdbserver/
	* server.c (handle_query): Report qXfer:siginfo:read and
	qXfer:siginfo:write as supported and handle them.
	* target.h (struct target_ops) <qxfer_siginfo>: New field.
	* linux-low.c (linux_xfer_siginfo): New.
	(linux_target_ops): Set it.

2009-02-06  Pedro Alves  <pedro@codesourcery.com>

	gdb/doc/
	* gdb.texinfo (Signals): Document $_siginfo.
	(Convenience Variables): Mention $_siginfo.
	(Remote Configuration): Document qXfer:siginfo:read,
	qXfer:siginfo:write packets, and the read-siginfo-object,
	write-siginfo-object commands.

2009-02-06  Pedro Alves  <pedro@codesourcery.com>

	gdb/testsuite/
	* gdb.base/siginfo-obj.c, gdb.base/siginfo-obj.exp: New.

4 files changed, 126 insertions, 0 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 3fda37e..30d7e0f 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,11 @@
+2009-02-06  Pedro Alves  <pedro@codesourcery.com>
+
+	* server.c (handle_query): Report qXfer:siginfo:read and
+	qXfer:siginfo:write as supported and handle them.
+	* target.h (struct target_ops) <qxfer_siginfo>: New field.
+	* linux-low.c (linux_xfer_siginfo): New.
+	(linux_target_ops): Set it.
+
 2009-01-26  Pedro Alves  <pedro@codesourcery.com>
 
 	* server.c (gdbserver_usage): Mention --remote-debug.
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 3fa06ec..38dd000 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -2180,6 +2180,44 @@ linux_qxfer_osdata (const char *annex,
   return len;
 }
 
+static int
+linux_xfer_siginfo (const char *annex, unsigned char *readbuf,
+		    unsigned const char *writebuf, CORE_ADDR offset, int len)
+{
+  struct siginfo siginfo;
+  long pid = -1;
+
+  if (current_inferior == NULL)
+    return -1;
+
+  pid = pid_of (get_thread_process (current_inferior));
+
+  if (debug_threads)
+    fprintf (stderr, "%s siginfo for lwp %ld.\n",
+	     readbuf != NULL ? "Reading" : "Writing",
+	     pid);
+
+  if (offset > sizeof (siginfo))
+    return -1;
+
+  if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0)
+    return -1;
+
+  if (offset + len > sizeof (siginfo))
+    len = sizeof (siginfo) - offset;
+
+  if (readbuf != NULL)
+    memcpy (readbuf, (char *) &siginfo + offset, len);
+  else
+    {
+      memcpy ((char *) &siginfo + offset, writebuf, len);
+      if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0)
+	return -1;
+    }
+
+  return len;
+}
+
 static struct target_ops linux_target_ops = {
   linux_create_inferior,
   linux_attach,
@@ -2213,6 +2251,7 @@ static struct target_ops linux_target_ops = {
   NULL,
   hostio_last_error_from_errno,
   linux_qxfer_osdata,
+  linux_xfer_siginfo,
 };
 
 static void
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index c4e1672..416ceb3 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -810,6 +810,77 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
       return;
     }
 
+  if (the_target->qxfer_siginfo != NULL
+      && strncmp ("qXfer:siginfo:read:", own_buf, 19) == 0)
+    {
+      unsigned char *data;
+      int n;
+      CORE_ADDR ofs;
+      unsigned int len;
+      char *annex;
+
+      require_running (own_buf);
+
+      /* Reject any annex; grab the offset and length.  */
+      if (decode_xfer_read (own_buf + 19, &annex, &ofs, &len) < 0
+	  || annex[0] != '\0')
+	{
+	  strcpy (own_buf, "E00");
+	  return;
+	}
+
+      /* Read one extra byte, as an indicator of whether there is
+	 more.  */
+      if (len > PBUFSIZ - 2)
+	len = PBUFSIZ - 2;
+      data = malloc (len + 1);
+      if (!data)
+        return;
+      n = (*the_target->qxfer_siginfo) (annex, data, NULL, ofs, len + 1);
+      if (n < 0)
+	write_enn (own_buf);
+      else if (n > len)
+	*new_packet_len_p = write_qxfer_response (own_buf, data, len, 1);
+      else
+	*new_packet_len_p = write_qxfer_response (own_buf, data, n, 0);
+
+      free (data);
+      return;
+    }
+
+  if (the_target->qxfer_siginfo != NULL
+      && strncmp ("qXfer:siginfo:write:", own_buf, 20) == 0)
+    {
+      char *annex;
+      int n;
+      unsigned int len;
+      CORE_ADDR ofs;
+      unsigned char *data;
+
+      require_running (own_buf);
+
+      strcpy (own_buf, "E00");
+      data = malloc (packet_len - 19);
+      if (!data)
+        return;
+      if (decode_xfer_write (own_buf + 20, packet_len - 20, &annex,
+			     &ofs, &len, data) < 0)
+	{
+	  free (data);
+	  return;
+	}
+
+      n = (*the_target->qxfer_siginfo)
+	(annex, NULL, (unsigned const char *)data, ofs, len);
+      if (n < 0)
+	write_enn (own_buf);
+      else
+	sprintf (own_buf, "%x", n);
+
+      free (data);
+      return;
+    }
+
   /* Protocol features query.  */
   if (strncmp ("qSupported", own_buf, 10) == 0
       && (own_buf[10] == ':' || own_buf[10] == '\0'))
@@ -826,6 +897,9 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
       if (the_target->qxfer_spu != NULL)
 	strcat (own_buf, ";qXfer:spu:read+;qXfer:spu:write+");
 
+      if (the_target->qxfer_siginfo != NULL)
+	strcat (own_buf, ";qXfer:siginfo:read+;qXfer:siginfo:write+");
+
       /* We always report qXfer:features:read, as targets may
 	 install XML files on a subsequent call to arch_setup.
 	 If we reported to GDB on startup that we don't support
diff --git a/gdb/gdbserver/target.h b/gdb/gdbserver/target.h
index a1dfad6..7851a4c 100644
--- a/gdb/gdbserver/target.h
+++ b/gdb/gdbserver/target.h
@@ -193,6 +193,11 @@ struct target_ops
   int (*qxfer_osdata) (const char *annex, unsigned char *readbuf,
 		       unsigned const char *writebuf, CORE_ADDR offset, 
 		       int len);
+
+  /* Read/Write extra signal info.  */
+  int (*qxfer_siginfo) (const char *annex, unsigned char *readbuf,
+			unsigned const char *writebuf,
+			CORE_ADDR offset, int len);
 };
 
 extern struct target_ops *the_target;