Cygwin32 support; Make eabi update stack first before doing stores in prolog

From-SVN: r11259

gcc/config/rs6000/cygwin32.h

@@ -35,7 +35,7 @@ Boston, MA 02111-1307, USA. */
 
 #define	CPP_PREDEFINES "-DWIN32 -D__WIN32__ -D__WINNT__ \
   -D__CYGWIN32__ -DPOSIX \
-  -D_POWER -DPPC -Asystem(winnt) -Acpu(powerpc) -Amachine(powerpc)"
+  -D_POWER -D_ARCH_PPC -D__PPC__ -Asystem(winnt) -Acpu(powerpc) -Amachine(powerpc)"
 
 /* We have to dynamic link to get to the system dlls,
    and I've put all of libc and libm and the unix stuff into
@@ -49,10 +49,6 @@ Boston, MA 02111-1307, USA. */
 #define	LINK_SPEC "%{v:-V}"
 
 
-/* No need for libgcc, it's in the shared library. */
-#undef LIBGCC_SPEC
-#define LIBGCC_SPEC ""
-
 #undef STARTFILE_SPEC
 #define STARTFILE_SPEC "%{!:crt0%O%s}"
 
@@ -62,3 +58,7 @@ Boston, MA 02111-1307, USA. */
 #define WCHAR_TYPE "short unsigned int"
 
 /* XXX set up stack probing */
+
+#define DBX_DEBUGGING_INFO 
+#undef SDB_DEBUGGING_INFO 
+#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG

gcc/config/rs6000/ntstack.asm

+# CYGNUS LOCAL -- NT/WRS development, meissner
+# Allocate stack for NT, inserting stack probes every 4k pages
+
+	.file	"ntstack.asm"
+
+#	Setup MS Structured-Exception-Handling
+	.pdata
+	.align 2
+	.ualong ..__allocate_stack,__allocate_stack.e,0,0,__allocate_stack.b
+
+#	Switch to the relocation section
+	.reldata
+	.globl __allocate_stack
+	.globl ..__allocate_stack
+__allocate_stack:
+	.ualong ..__allocate_stack,.toc
+
+	.text
+	.align 2
+..__allocate_stack:
+	.function	..__allocate_stack
+__allocate_stack.b:
+	lwz	0,0(1)			# old stack link
+	srawi.	4,3,12			# get # of pages to check
+	neg	3,3			# negate so we can use stwux
+	bgt-	0,.Lcheck
+	stwux	0,1,3			# small request, just decrement and return
+	blr
+
+.Lcheck:
+	mtctr	4			# number of pages to check
+	mr	5,1			# tmp pointer
+.Lloop:
+	lwzu	6,-4096(5)		# touch the page
+	bdnz+	.Lloop			# and loop back
+
+	stwux	0,1,3			# update stack pointer
+	blr
+
+__allocate_stack.e:
+FE_MOT_RESVD..__allocate_stack:
+# END CYGNUS LOCAL -- NT/WRS development, meissner

gcc/config/rs6000/rs6000.md

@@ -6327,6 +6327,18 @@
 
   emit_move_insn (chain, stack_bot);
 
+  /* Under Windows NT, we need to add stack probes for large/variable allocations,
+     so do it via a call to the external function alloca, instead of doing it
+     inline.  */
+  if (DEFAULT_ABI == ABI_NT
+      && (GET_CODE (operands[0]) != CONST_INT || INTVAL (operands[0]) > 4096))
+    {
+      emit_library_call (gen_rtx (SYMBOL_REF, Pmode, \"__allocate_stack\"), 0,
+			 VOIDmode, 1,
+			 operands[0], Pmode);
+      DONE;
+    }
+
   if (GET_CODE (operands[0]) != CONST_INT
       || INTVAL (operands[0]) < -32767
       || INTVAL (operands[0]) > 32768)

gcc/config/rs6000/t-winnt

@@ -9,7 +9,7 @@ LIBGCC1_TEST =
 
 # These are really part of libgcc1, but this will cause them to be
 # built correctly, so... [taken from t-sparclite]
-LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c
+LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c ntstack.s
 
 dp-bit.c: $(srcdir)/config/fp-bit.c
 	cat $(srcdir)/config/fp-bit.c > dp-bit.c
@@ -18,10 +18,5 @@ fp-bit.c: $(srcdir)/config/fp-bit.c
 	echo '#define FLOAT' > fp-bit.c
 	cat $(srcdir)/config/fp-bit.c >> fp-bit.c
 
-# Build the libraries for both hard and soft floating point
-
-MULTILIB_OPTIONS = msoft-float
-MULTILIB_DIRNAMES = soft-float
-
-LIBGCC = stmp-multilib
-INSTALL_LIBGCC = install-multilib
+ntstack.s: $(srcdir)/config/rs6000/ntstack.asm
+	cat $(srcdir)/config/rs6000/ntstack.asm > ntstack.s

gcc/config/rs6000/win-nt.h

@@ -36,7 +36,7 @@ Boston, MA 02111-1307, USA.  */
 #undef	CPP_PREDEFINES
 #define	CPP_PREDEFINES "-DWIN32 -D_WIN32 \
   -DWINNT -D__STDC__=0 -DALMOST_STDC \
-  -D_POWER -DPPC -Asystem(winnt) -Acpu(powerpc) -Amachine(powerpc)"
+  -D_POWER -D_ARCH_PPC -D__PPC__ -Asystem(winnt) -Acpu(powerpc) -Amachine(powerpc)"
 
 #if 0
 #include "winnt/win-nt.h"

gcc/config/rs6000/x-cygwin32

+USE_COLLECT2 =

gcc/config/rs6000/xm-cygwin32.h

+/* Configuration for GNU C-compiler for hosting on Windows NT.
+   using a unix style C library.
+   Copyright (C) 1995 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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, or (at your option)
+any later version.
+
+GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#define NO_STAB_H
+
+#include "rs6000/xm-rs6000.h"
+
+#define HAVE_STRERROR
+#define HAVE_RUSAGE
+#define HAVE_FILE_H
+
+

gcc/libgcc1-test.c

@@ -95,6 +95,9 @@ dfoo ()
    message saying the start address is defaulted.  */
 extern void start() __asm__("start");
 extern void _start() __asm__("_start");
+extern void __start() __asm__("__start");
 
 void start() {}
 void _start() {}
+void __start() {}
+void mainCRTStartup() {}