Document the MIPS -mvxworks-pic option

[Richard Sandiford <richard at codesourcery dot com>]

When I submitted the MIPS VxWorks support, I forgot to document
-mvxworks-pic.  Tsk.  As penance, I've added some documentation for
-KPIC too; it was listed in the overview, but not in the main table.

Other options are missing documentation too, but I don't have time
for a full overhaul.  I hope this patch is at least a strict
improvement on what we have now.

Tested on mips-wrs-vxworks.  OK to install?

Richard


	* doc/as.texinfo: Add -mvxworks-pic to the list of MIPS options.
	* doc/c-mips.texi (-KPIC, -mvxworks-pic): Document.
	* config/tc-mips.c (md_show_usage): Mention -mvxworks-pic.

Index: gas/config/tc-mips.c
===================================================================
RCS file: /cvs/src/src/gas/config/tc-mips.c,v
retrieving revision 1.364
diff -u -p -r1.364 tc-mips.c
--- gas/config/tc-mips.c	20 Feb 2007 14:48:28 -0000	1.364
+++ gas/config/tc-mips.c	2 Apr 2007 13:36:24 -0000
@@ -14947,6 +14947,7 @@ MIPS options:\n\
 #ifdef OBJ_ELF
   fprintf (stream, _("\
 -KPIC, -call_shared	generate SVR4 position independent code\n\
+-mvxworks-pic		generate VxWorks position independent code\n\
 -non_shared		do not generate position independent code\n\
 -xgot			assume a 32 bit GOT\n\
 -mpdr, -mno-pdr		enable/disable creation of .pdr sections\n\
Index: gas/doc/as.texinfo
===================================================================
RCS file: /cvs/src/src/gas/doc/as.texinfo,v
retrieving revision 1.162
diff -u -p -r1.162 as.texinfo
--- gas/doc/as.texinfo	28 Mar 2007 09:08:53 -0000	1.162
+++ gas/doc/as.texinfo	2 Apr 2007 13:36:26 -0000
@@ -369,7 +369,7 @@ gcc(1), ld(1), and the Info entries for 
 @emph{Target MIPS options:}
    [@b{-nocpp}] [@b{-EL}] [@b{-EB}] [@b{-O}[@var{optimization level}]]
    [@b{-g}[@var{debug level}]] [@b{-G} @var{num}] [@b{-KPIC}] [@b{-call_shared}]
-   [@b{-non_shared}] [@b{-xgot}]
+   [@b{-non_shared}] [@b{-xgot} [@b{-mvxworks-pic}]
    [@b{-mabi}=@var{ABI}] [@b{-32}] [@b{-n32}] [@b{-64}] [@b{-mfp32}] [@b{-mgp32}]
    [@b{-march}=@var{CPU}] [@b{-mtune}=@var{CPU}] [@b{-mips1}] [@b{-mips2}]
    [@b{-mips3}] [@b{-mips4}] [@b{-mips5}] [@b{-mips32}] [@b{-mips32r2}]
Index: gas/doc/c-mips.texi
===================================================================
RCS file: /cvs/src/src/gas/doc/c-mips.texi,v
retrieving revision 1.41
diff -u -p -r1.41 c-mips.texi
--- gas/doc/c-mips.texi	20 Feb 2007 15:03:45 -0000	1.41
+++ gas/doc/c-mips.texi	2 Apr 2007 13:36:26 -0000
@@ -60,6 +60,18 @@ little-endian output at run time (unlike
 tools, which must be configured for one or the other).  Use @samp{-EB}
 to select big-endian output, and @samp{-EL} for little-endian.
 
+@item -KPIC
+@cindex PIC selection, MIPS
+@cindex @option{-KPIC} option, MIPS
+Generate SVR4-style PIC.  This option tells the assembler to generate
+SVR4-style position-independent macro expansions.  It also tells the
+assembler to mark the output file as PIC.
+
+@item -mvxworks-pic
+@cindex @option{-mvxworks-pic} option, MIPS
+Generate VxWorks PIC.  This option tells the assembler to generate
+VxWorks-style position-independent macro expansions.
+
 @cindex MIPS architecture options
 @item -mips1
 @itemx -mips2