[RFA for trunk, 3.4 branch] enable mips-vxworks config.

[cgd at broadcom dot com]

The following patch enables mips-vxworks support.  Ideally, I'd like
to see it approved for trunk and the 3.4 branch (it applies
almost-cleanly to the branch -- just a few offset changes, IIRC).

With this patch, mips-vxworks-gcc works well enough to compile a
couple of my favorite vxworks BSPs into working vxWorks kernels.  The
mips-vxworks compiler still has to use the vxworks assembler and
linker, since I didn't want to work through incompatibilities with the
current binutils.

I've also verified that an i686-linux native compiler still builds w/
the change.

Because of the config/vxworks.h problem, i don't think that ppc
vxworks support works anyplace right now (can't test it myself), so
i'm not worried about breaking it w/ the longlong.h changes.  But
based on the #defines provided by the vxworks hdrs and by the rs6000
backend, i think they're correct.



chris
--
2004-06-04  Chris Demetriou  <cgd@broadcom.com>

	* gcov-io.c (gcov_open) [GCOV_LOCKED]: Always supply three
	arguments to open().

	* longlong.h: Don't assume that "PPC" being defined means PowerPC;
	on VxWorks it doesn't.  Check for '__ppc' for VxWorks.

	* config/vxworks.h (HANDLE_SYSV_PRAGMA): Define with value "1"
	for consistency with other definitions.

	* config/mips/vxworks.h (EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS):
	Do not redefine.
	(SUBTARGET_CC1_SPEC): Use -mabi=o64 for 64-bit ISAs, if no other
	ABI is specified.
	(MDEBUG_ASM_SPEC): Redefine (now empty).
	
Index: gcov-io.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/gcov-io.c,v
retrieving revision 1.15
diff -u -p -r1.15 gcov-io.c
--- gcov-io.c	23 Feb 2004 17:02:50 -0000	1.15
+++ gcov-io.c	5 Jun 2004 06:18:17 -0000
@@ -84,8 +84,11 @@ gcov_open (const char *name, int mode)
   gcov_var.endian = 0;
 #endif
 #if GCOV_LOCKED
+  /* Some systems, e.g. VxWorks, prototype open() as having 3 arguments.
+     To accomodate these, we supply the third argument here even when it's
+     unnecessary.  This should cause no harm.  */
   if (mode > 0)
-    fd = open (name, O_RDWR);
+    fd = open (name, O_RDWR, 0);
   else
     fd = open (name, O_RDWR | O_CREAT, 0666);
   if (fd < 0)
Index: longlong.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/longlong.h,v
retrieving revision 1.43
diff -u -p -r1.43 longlong.h
--- longlong.h	16 Mar 2004 04:12:25 -0000	1.43
+++ longlong.h	5 Jun 2004 06:18:18 -0000
@@ -631,15 +631,17 @@ UDItype __umulsidi3 (USItype, USItype);
 
 /* FIXME: We should test _IBMR2 here when we add assembly support for the
    system vendor compilers.
-   FIXME: What's needed for gcc PowerPC VxWorks?  __vxworks__ is not good
-   enough, since that hits ARM and m68k too.  */
+   Note: on vxWorks, because of headers included before longlong.h
+   (vxCpu.h), "PPC" will be defined for all architectures!  So, we exclude
+   it here.  (Current) GCC defines __ppc for vxWorks.  */
 #if (defined (_ARCH_PPC)	/* AIX */				\
      || defined (_ARCH_PWR)	/* AIX */				\
      || defined (_ARCH_COM)	/* AIX */				\
      || defined (__powerpc__)	/* gcc */				\
      || defined (__POWERPC__)	/* BEOS */				\
      || defined (__ppc__)	/* Darwin */				\
-     || defined (PPC)		/* GNU/Linux, SysV */			\
+     || (defined (PPC) && !defined (__vxworks)) /* GNU/Linux, SysV */	\
+     || defined (__ppc)		/* vxWorks */				\
      ) && W_TYPE_SIZE == 32
 #define add_ssaaaa(sh, sl, ah, al, bh, bl) \
   do {									\
Index: config/vxworks.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/vxworks.h,v
retrieving revision 1.5
diff -u -p -r1.5 vxworks.h
--- config/vxworks.h	24 Dec 2003 00:14:19 -0000	1.5
+++ config/vxworks.h	5 Jun 2004 06:18:18 -0000
@@ -43,7 +43,7 @@ Boston, MA 02111-1307, USA.  */
 #define NO_DOT_IN_LABEL
 
 /* enable #pragma pack(n) */
-#define HANDLE_SYSV_PRAGMA
+#define HANDLE_SYSV_PRAGMA 1
 
 /* No underscore is prepended to any C symbol name.  */
 #undef USER_LABEL_PREFIX
Index: config/mips/vxworks.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/mips/vxworks.h,v
retrieving revision 1.9
diff -u -p -r1.9 vxworks.h
--- config/mips/vxworks.h	22 Apr 2004 07:03:00 -0000	1.9
+++ config/mips/vxworks.h	5 Jun 2004 06:18:18 -0000
@@ -17,14 +17,6 @@ along with GCC; see the file COPYING.  I
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
-#undef  EXTRA_SECTIONS
-#define EXTRA_SECTIONS in_sdata, in_sbss
-
-#undef  EXTRA_SECTION_FUNCTIONS
-#define EXTRA_SECTION_FUNCTIONS                                            \
-  SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \
-  SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP)
-
 
 #undef  TARGET_VERSION
 #define TARGET_VERSION fprintf (stderr, " (MIPS, VxWorks syntax)");
@@ -73,6 +65,17 @@ Boston, MA 02111-1307, USA.  */
   %{msoft-float:-DSOFT_FLOAT} \
   %{mips1:-D_WRS_R3K_EXC_SUPPORT}"
 
+/* Fake out the ABI.  64-bit ISAs use O64, but it seems to be marked
+   like o32 in the vxworks kernel libraries..  Therefore, when building
+   64-bit code we tell cc1 to use the o64 ABI but don't tell
+   the assembler anything.  */
+#undef SUBTARGET_CC1_SPEC
+#define SUBTARGET_CC1_SPEC "%{!mabi=*:%{mips3|mips4|mips64:-mabi=o64}}"
+
 /* No sdata.  */
 #undef MIPS_DEFAULT_GVALUE
 #define MIPS_DEFAULT_GVALUE 0
+
+/* -mdebug / -no-mdebug aren't supported by the assembler.  */
+#undef MDEBUG_ASM_SPEC
+#define MDEBUG_ASM_SPEC ""