[doc] Mention accelerated watchpoint conditions in the gdb manual

[Thiago Jung Bauermann <bauerman@br.ibm.com>]

Hi,

I mentioned this feature in the NEWS file but I just realized that it
would be useful to mention in the manual too. Ok to apply? For the
branch too?
-- 
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center


2010-08-17  Thiago Jung Bauermann  <bauerman@br.ibm.com>

	* gdb.texinfo (PowerPC Embedded): Mention support for the DVC register.

Index: gdb.git/gdb/doc/gdb.texinfo
===================================================================
--- gdb.git.orig/gdb/doc/gdb.texinfo	2010-08-17 12:22:56.000000000 -0300
+++ gdb.git/gdb/doc/gdb.texinfo	2010-08-17 12:30:34.000000000 -0300
@@ -18472,6 +18472,17 @@ Set suspend trace mode.
 @node PowerPC Embedded
 @subsection PowerPC Embedded
 
+@value{GDBN} supports using the DVC (Data Value Compare) register to
+implement in hardware simple hardware watchpoint conditions of the form:
+
+@smallexample
+(@value{GDBP}) watch @var{ADDRESS|VARIABLE} if  @var{ADDRESS|VARIABLE} == @var{CONSTANT EXPRESSION}
+@end smallexample
+
+The DVC register will be automatically used whenever @value{GDBN} detects
+such pattern in a condition expression.  This feature is available in native
+@value{GDBN} running on a Linux kernel version 2.6.34 or newer.
+
 @value{GDBN} provides the following PowerPC-specific commands:
 
 @table @code