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[PATCH 3/3] [AARCH64] ILP32: redirect stat syscall family to 64-bit handlers

From: Yury Norov <ynorov at caviumnetworks dot com>
To: <libc-alpha at sourceware dot org>, <joseph at codesourcery dot com>, <schwab at suse dot de>
Cc: <arnd at arndb dot de>, <catalin dot marinas at arm dot com>, <davem at davemloft dot net>, <szabolcs dot nagy at arm dot com>, <maxim dot kuvyrkov at linaro dot org>, <pinskia at gmail dot com>, <bamvor dot zhangjian at huawei dot com>, <fweimer at redhat dot com>, <Prasun dot Kapoor at cavium dot com>, <adhemerval dot zanella at linaro dot org>, Yury Norov <ynorov at caviumnetworks dot com>
Date: Thu, 4 Aug 2016 13:02:39 +0300
Subject: [PATCH 3/3] [AARCH64] ILP32: redirect stat syscall family to 64-bit handlers
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References: <1470304959-9944-1-git-send-email-ynorov@caviumnetworks.com>
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__ASSUME_SUPPORT_64_BIT_TIME_TYPES and XSTAT_IS_XSTAT64 are enabled
to ensure that glibc creates stat{,fs} layouts identical to 64-bit
versions, and so we can redirect corresponding syscalls 64-bit handlers.

statfs() and  fstatfs() are handled separately as aarch64 requires
non-standard argument passing.

	* sysdeps/unix/sysv/linux/aarch64/bits/typesizes.h: enable
	  __ASSUME_SUPPORT_64_BIT_TIME_TYPES and XSTAT_IS_XSTAT64
	* sysdeps/unix/sysv/linux/aarch64/ilp32/fstatfs64.c: handle
	  fstatfs() syscall
	* sysdeps/unix/sysv/linux/aarch64/ilp32/statfs64.c: handle
	  statfs() syscall

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
---
 sysdeps/unix/sysv/linux/aarch64/bits/typesizes.h  |  6 ++++
 sysdeps/unix/sysv/linux/aarch64/ilp32/fstatfs64.c | 35 +++++++++++++++++++++
 sysdeps/unix/sysv/linux/aarch64/ilp32/statfs64.c  | 38 +++++++++++++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/ilp32/fstatfs64.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/ilp32/statfs64.c

diff --git a/sysdeps/unix/sysv/linux/aarch64/bits/typesizes.h b/sysdeps/unix/sysv/linux/aarch64/bits/typesizes.h
index 39c0c81..be6497f 100644
--- a/sysdeps/unix/sysv/linux/aarch64/bits/typesizes.h
+++ b/sysdeps/unix/sysv/linux/aarch64/bits/typesizes.h
@@ -62,6 +62,12 @@
 #define __SYSCALL_ULONG_TYPE	__ULONGWORD_TYPE
 #define __CPU_MASK_TYPE         __ULONGWORD_TYPE
 
+
+#ifdef __ILP32__
+# define __ASSUME_SUPPORT_64_BIT_TIME_TYPES
+# define XSTAT_IS_XSTAT64
+#endif
+
 /* Tell the libc code that off_t and off64_t are actually the same type
    for all ABI purposes, even if possibly expressed as different base types
    for C type-checking purposes.  */
diff --git a/sysdeps/unix/sysv/linux/aarch64/ilp32/fstatfs64.c b/sysdeps/unix/sysv/linux/aarch64/ilp32/fstatfs64.c
new file mode 100644
index 0000000..ad5675d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/ilp32/fstatfs64.c
@@ -0,0 +1,35 @@
+/* Return information about the filesystem on which FD resides.
+   Copyright (C) 1996-2016 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/>.  */
+#define __fstatfs __statfs_disable
+#define fstatfs statfs_disable
+
+#include <errno.h>
+#include <sys/statfs.h>
+#include <stddef.h>
+
+int
+__fstatfs64 (int fd, struct statfs64 *buf)
+{
+  return INLINE_SYSCALL (fstatfs64, 2, fd, buf);
+}
+
+#undef __fstatfs
+#undef fstatfs
+strong_alias (__fstatfs64, __fstatfs)
+weak_alias (__fstatfs64, fstatfs64)
+weak_alias (__fstatfs64, fstatfs)
diff --git a/sysdeps/unix/sysv/linux/aarch64/ilp32/statfs64.c b/sysdeps/unix/sysv/linux/aarch64/ilp32/statfs64.c
new file mode 100644
index 0000000..66772a8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/ilp32/statfs64.c
@@ -0,0 +1,38 @@
+/* Return information about the filesystem on which FILE resides.
+
+   Copyright (C) 2011-2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   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/>.  */
+#define __statfs __statfs_disable
+#define statfs statfs_disable
+
+#include <errno.h>
+#include <sys/statfs.h>
+#include <stddef.h>
+
+int
+__statfs64 (const char *file, struct statfs64 *buf)
+{
+  return INLINE_SYSCALL (statfs64, 2, file, buf);
+}
+
+#undef __statfs
+#undef statfs
+weak_alias (__statfs64, statfs64)
+strong_alias (__statfs64, __statfs)
+libc_hidden_ver (__statfs64, __statfs)
+weak_alias (__statfs64, statfs)
-- 
2.7.4

Follow-Ups:
- Re: [PATCH 3/3] [AARCH64] ILP32: redirect stat syscall family to 64-bit handlers
  - From: Joseph Myers

References:
- [PATCH 0/3] stat syscall family: support modern 32-bit ABI requirements
  - From: Yury Norov

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