posix: Fix mmap for m68k and ia64 (BZ#21908)

Default semantic for mmap2 syscall is to take the offset in 4096-byte
units.  However m68k and ia64 mmap2 implementation take in the
configured pageunit units and for both architecture it can be
different values.

This patch fixes the m68k runtime discover of mmap2 offset unit
and adds the ia64 definition to find it at runtime.

Checked the basic tst-mmap and tst-mmap-offset on m68k (the system
is configured with 4k, so current code is already passing on this
system) and a sanity check on x86_64-linux-gnu (which should not be
affected by this change).  Sergei also states that ia64 loader now
work correctly with this change.

	Adhemerval Zanella  <adhemerval.zanella@linaro.org>
	Sergei Trofimovich  <slyfox@inbox.ru>

	* sysdeps/unix/sysv/linux/m68k/mmap_internal.h (MMAP2_PAGE_SHIFT):
	Rename to MMAP2_PAGE_UNIT.
	* sysdeps/unix/sysv/linux/mmap.c: Include mmap_internal iff
	__OFF_T_MATCHES_OFF64_T is not defined.
	* sysdeps/unix/sysv/linux/mmap_internal.h (page_unit): Declare as
	uint64_t.
	(MMAP2_PAGE_UNIT) [MMAP2_PAGE_UNIT == -1]: Redefine to page_unit.
	(page_unit) [MMAP2_PAGE_UNIT != -1]: Remove definition.

(cherry picked from commit 1f14d0c3ddce47f7021bbc0862fdb207891345dc)

diff --git a/ChangeLog b/ChangeLog
index 4fb30a1d8fad7497772a471732cf2cb9d7c03107..fb40c4c5dcec2cf4e07f748bcbd56eb25687b457 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2017-12-12  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+           Sergei Trofimovich  <slyfox@inbox.ru>
+
+       [BZ #21908]
+       * sysdeps/unix/sysv/linux/m68k/mmap_internal.h (MMAP2_PAGE_SHIFT):
+       Rename to MMAP2_PAGE_UNIT.
+       * sysdeps/unix/sysv/linux/ia64/mmap_internal.h: New file.
+       * sysdeps/unix/sysv/linux/mmap.c: Include mmap_internal iff
+       __OFF_T_MATCHES_OFF64_T is not defined.
+       * sysdeps/unix/sysv/linux/mmap_internal.h (page_unit): Declare as
+       uint64_t.
+       (MMAP2_PAGE_UNIT) [MMAP2_PAGE_UNIT == -1]: Redefine to page_unit.
+       (page_unit) [MMAP2_PAGE_UNIT != -1]: Remove definition.
+
 2017-12-12  James Clarke <jrtc27@jrtc27.com>
 
        * sysdeps/unix/sysv/linux/ia64/ipc_priv.h: New file defining

diff --git a/sysdeps/unix/sysv/linux/ia64/mmap_internal.h b/sysdeps/unix/sysv/linux/ia64/mmap_internal.h
new file mode 100644 (file)
index 0000000..dbaaa3f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ia64/mmap_internal.h
@@ -0,0 +1,29 @@
+/* Common mmap definition for Linux implementation.  Linux/ia64 version.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef MMAP_IA64_INTERNAL_LINUX_H
+#define MMAP_IA64_INTERNAL_LINUX_H
+
+/* Linux allows PAGE_SHIFT in range of [12-16] and expect
+   mmap2 offset to be provided in based on the configured pagesize.
+   Determine the shift dynamically with getpagesize.  */
+#define MMAP2_PAGE_UNIT -1
+
+#include_next <mmap_internal.h>
+
+#endif

diff --git a/sysdeps/unix/sysv/linux/m68k/mmap_internal.h b/sysdeps/unix/sysv/linux/m68k/mmap_internal.h
index bd8bd3843b40c511e5199b7cf76a76748c77cd08..9fe9d9127d556ae292a05648c6affc1696069c97 100644 (file)
--- a/sysdeps/unix/sysv/linux/m68k/mmap_internal.h
+++ b/sysdeps/unix/sysv/linux/m68k/mmap_internal.h
@@ -22,7 +22,7 @@
 /* ColdFire and Sun 3 kernels have PAGE_SHIFT set to 13 and expect
    mmap2 offset to be provided in 8K pages.  Determine the shift
    dynamically with getpagesize.  */
-#define MMAP2_PAGE_SHIFT -1
+#define MMAP2_PAGE_UNIT -1
 
 #include_next <mmap_internal.h>
 

diff --git a/sysdeps/unix/sysv/linux/mmap.c b/sysdeps/unix/sysv/linux/mmap.c
index 98c2f88eb8b09c3b4d39d99b4f6f1e29db4404f2..59292b6d790c8a6eb98f4f3eab9e4db911f3d232 100644 (file)
--- a/sysdeps/unix/sysv/linux/mmap.c
+++ b/sysdeps/unix/sysv/linux/mmap.c
@@ -21,9 +21,9 @@
 #include <sys/mman.h>
 #include <sysdep.h>
 #include <stdint.h>
-#include <mmap_internal.h>
 
 #ifndef __OFF_T_MATCHES_OFF64_T
+# include <mmap_internal.h>
 
 /* An architecture may override this.  */
 # ifndef MMAP_ADJUST_OFFSET

diff --git a/sysdeps/unix/sysv/linux/mmap_internal.h b/sysdeps/unix/sysv/linux/mmap_internal.h
index 499e3896050d1bbb77e42960f4ed19c5c3d48028..47c099183ccc8485e1c482c6e77a292958f907c7 100644 (file)
--- a/sysdeps/unix/sysv/linux/mmap_internal.h
+++ b/sysdeps/unix/sysv/linux/mmap_internal.h
@@ -27,13 +27,13 @@
 #endif
 
 #if MMAP2_PAGE_UNIT == -1
-static int page_unit;
-
+static uint64_t page_unit;
 # define MMAP_CHECK_PAGE_UNIT()                        \
   if (page_unit == 0)                          \
     page_unit = __getpagesize ();
+# undef MMAP2_PAGE_UNIT
+# define MMAP2_PAGE_UNIT page_unit
 #else
-# define page_unit MMAP2_PAGE_UNIT
 # define MMAP_CHECK_PAGE_UNIT()
 #endif