re PR pch/14940 (PCH largefile test fails on various platforms)

PR pch/14940
	* config/pa/pa-host.c, config/pa/x-hpux, config/pa/x-linux: New files.
	* config.host (hppa*-*-hpux*, hppa*-*-linux): Define out_host_hook_obj
	and host_xmake_file using new host configuration files.

From-SVN: r91509

gcc/ChangeLog

@@ -1,3 +1,10 @@
+2004-11-29  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR pch/14940
+	* config/pa/pa-host.c, config/pa/x-hpux, config/pa/x-linux: New files.
+	* config.host (hppa*-*-hpux*, hppa*-*-linux): Define out_host_hook_obj
+	and host_xmake_file using new host configuration files.
+
 2004-11-29  Roger Sayle  <roger@eyesopen.com>
 
 	* reg-stack.c (change_stack): Improve algorithm used to pop regs

gcc/config.host

@@ -113,7 +113,12 @@ case ${host} in
   hppa1.0-*-hpux10* | hppa1.1-*-hpux10* | hppa2*-*-hpux10* | \
   hppa1.0-*-hpux11* | hppa1.1-*-hpux11* | hppa2*-*-hpux11* | \
   hppa*64*-*-hpux11*)
-    host_xmake_file="pa/x-ada"
+    out_host_hook_obj=pa-host.o
+    host_xmake_file=pa/x-hpux
+    ;;
+  hppa*-*-linux*)
+    out_host_hook_obj=pa-host.o
+    host_xmake_file=pa/x-linux
     ;;
   i370-*-opened* | i370-*-mvs* ) # IBM 360/370/390 Architecture
     host_xm_defines='FATAL_EXIT_CODE=12'

gcc/config/pa/pa-host.c

@@ -0,0 +1,122 @@
+/* PA host-specific hook definitions.
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC 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.
+
+   GCC 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 GCC; see the file COPYING.  If not, write to the
+   Free Software Foundation, 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include <sys/mman.h>
+#include "hosthooks.h"
+#include "hosthooks-def.h"
+
+static void *pa_gt_pch_get_address (size_t, int);
+static int pa_gt_pch_use_address (void *, size_t, int, size_t);
+
+#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
+#define HOST_HOOKS_GT_PCH_GET_ADDRESS pa_gt_pch_get_address
+#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
+#define HOST_HOOKS_GT_PCH_USE_ADDRESS pa_gt_pch_use_address
+
+/* For various ports, try to guess a fixed spot in the vm space
+   that's probably free.  */
+#if defined(__hppa__) && defined(__LP64__)
+# define TRY_EMPTY_VM_SPACE	0x8000000000000000
+#elif defined(__hppa__)
+# define TRY_EMPTY_VM_SPACE	0x60000000
+#else
+# define TRY_EMPTY_VM_SPACE	0
+#endif
+
+/* Determine a location where we might be able to reliably allocate
+   SIZE bytes.  FD is the PCH file, though we should return with the
+   file unmapped.  */
+
+static void *
+pa_gt_pch_get_address (size_t size, int fd)
+{
+  void *addr;
+
+  addr = mmap ((void *)TRY_EMPTY_VM_SPACE, size, PROT_READ | PROT_WRITE,
+	       MAP_PRIVATE, fd, 0);
+
+  /* If we failed the map, that means there's *no* free space.  */
+  if (addr == (void *) MAP_FAILED)
+    return NULL;
+  /* Unmap the area before returning.  */
+  munmap (addr, size);
+
+  return addr;
+}
+
+/* Map SIZE bytes of FD+OFFSET at BASE.  Return 1 if we succeeded at
+   mapping the data at BASE, -1 if we couldn't.
+
+   It's not possibly to reliably mmap a file using MAP_PRIVATE to
+   a specific START address on either hpux or linux.  First we see
+   if mmap with MAP_PRIVATE works.  If it does, we are off to the
+   races.  If it doesn't, we try an anonymous MAP_PRIVATE since the
+   kernel is more likely to honor the BASE address in anonymous maps.
+   We then mmap the file to an arbitrary location and copy the data
+   to the anonymous private map.  This assumes of course that we
+   don't need to change the PCH data after the file is created.
+
+   This approach obviously causes a performance penalty but there is
+   little else we can do given the current PCH implementation.  */
+
+static int
+pa_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
+{
+  void *addr, *faddr;
+
+  /* We're called with size == 0 if we're not planning to load a PCH
+     file at all.  This allows the hook to free any static space that
+     we might have allocated at link time.  */
+  if (size == 0)
+    return -1;
+
+  /* Try to map the file with MAP_PRIVATE.  */
+  addr = mmap (base, size, PROT_READ | PROT_WRITE,
+	       MAP_PRIVATE, fd, offset);
+
+  if (addr == base)
+    return 1;
+
+  if (addr != (void *) MAP_FAILED)
+    munmap (addr, size);
+
+  addr = mmap (base, size, PROT_READ | PROT_WRITE,
+	       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+  if (addr != base)
+    return -1;
+
+  faddr = mmap (NULL, size, PROT_READ, MAP_PRIVATE,
+		fd, offset);
+
+  if (faddr == (void *) MAP_FAILED)
+    return -1;
+
+  memcpy (addr, faddr, size);
+  munmap (faddr, size);
+
+  return 1;
+}
+
+
+const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;

gcc/config/pa/x-hpux

@@ -0,0 +1,9 @@
+# The ada virtual array implementation requires that indexing be disabled on
+# hosts such as hpux that use a segmented memory architecture.  Both the c
+# and ada files need to be compiled with this option for correct operation.
+X_ADA_CFLAGS=-mdisable-indexing
+
+pa-host.o : $(srcdir)/config/pa/pa-host.c $(CONFIG_H) $(SYSTEM_H) \
+  coretypes.h hosthooks.h hosthooks-def.h $(HOOKS_H)
+	$(CC) -c $(ALL_CFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) \
+		$(srcdir)/config/pa/pa-host.c

gcc/config/pa/x-linux

@@ -0,0 +1,4 @@
+pa-host.o : $(srcdir)/config/pa/pa-host.c $(CONFIG_H) $(SYSTEM_H) \
+  coretypes.h hosthooks.h hosthooks-def.h $(HOOKS_H)
+	$(CC) -c $(ALL_CFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) \
+		$(srcdir)/config/pa/pa-host.c