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[PATCH] Fix Linux sh4 pread/pwrite argument passing

From: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
To: libc-alpha at sourceware dot org
Cc: jrtc27 at jrtc27 dot com, glaubitz at physik dot fu-berlin dot de
Date: Mon, 24 Oct 2016 11:50:26 -0200
Subject: [PATCH] Fix Linux sh4 pread/pwrite argument passing
Authentication-results: sourceware.org; auth=none
Although conceptually correct for p{read,write}{64} offset argument passing,
sh4 implementation does not generate the correct expected code.  The
__ALIGNMENT_ARG redefinition is incorrect for two reasons: 1. the
kernel-features.h header is included multiple times (since it contains no
guards) and 2. the value it redefines is also incorrect (should be '0, '
instead of empty definition).

This patch fixes it by adding another macro, SYSCALL_LL_PRW{64}, meant to be
used to pass the offset argument on p{read,write}64.  It is basically the
already define SYSCALL_LL{64} plus __ALIGNMENT_ARG unless __ASSUME_PRW_DUMMY_ARG
is define.  In this case an empty dummy argument is used regardless how
__ALIGNMENT_ARG is defined (sh4 case).

Checked on x86_64, i686, aarch64, armhf, and powerpc64le (basically a sanity
check).  Also, John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> and
James Clarke <jrtc27@jrtc27.com> help me check on a debian sh4 bootstrap using
2.24 plus this patch to verify it also corrected fixed the regression issue.
I also verified the generated object for a 2.24 build and master with this
patch for sh4 and both look identical.

I will commit this shortly.

	* sysdeps/unix/sysv/linux/pread.c (__libc_pread): Use SYSCALL_LL_PRW.
	* sysdeps/unix/sysv/linux/pwrite.c (__libc_pwrite): Likewise.
	* sysdeps/unix/sysv/linux/pread64.c (__libc_pread64): Use
	SYSCALL_LL64_PRW.
	* sysdeps/unix/sysv/linux/pwrite64.c (__libc_pwrite64): Likewise.
	* sysdeps/unix/sysv/linux/sh/kernel-features.h: Define
	__ASSUME_PRW_DUMMY_ARG.
	* sysdeps/unix/sysv/linux/sh/pread.c: Remove file.
	* sysdeps/unix/sysv/linux/sh/pread64.c: Likewise.
	* sysdeps/unix/sysv/linux/sh/pwrite.c: Likewise.
	* sysdeps/unix/sysv/linux/sh/pwrite64.c: Likewise.
	* sysdeps/unix/sysv/linux/sysdep.h: Define SYSCALL_LL_PRW and
	SYSCALL_LL_PRW64 based on __ASSUME_PRW_DUMMY_ARG.
---
 ChangeLog                                    | 16 ++++++++++++++++
 sysdeps/unix/sysv/linux/pread.c              |  3 +--
 sysdeps/unix/sysv/linux/pread64.c            |  3 +--
 sysdeps/unix/sysv/linux/pwrite.c             |  3 +--
 sysdeps/unix/sysv/linux/pwrite64.c           |  3 +--
 sysdeps/unix/sysv/linux/sh/kernel-features.h |  5 +++++
 sysdeps/unix/sysv/linux/sh/pread.c           | 23 -----------------------
 sysdeps/unix/sysv/linux/sh/pread64.c         | 23 -----------------------
 sysdeps/unix/sysv/linux/sh/pwrite.c          | 23 -----------------------
 sysdeps/unix/sysv/linux/sh/pwrite64.c        | 23 -----------------------
 sysdeps/unix/sysv/linux/sysdep.h             | 10 ++++++++++
 11 files changed, 35 insertions(+), 100 deletions(-)
 delete mode 100644 sysdeps/unix/sysv/linux/sh/pread.c
 delete mode 100644 sysdeps/unix/sysv/linux/sh/pread64.c
 delete mode 100644 sysdeps/unix/sysv/linux/sh/pwrite.c
 delete mode 100644 sysdeps/unix/sysv/linux/sh/pwrite64.c

diff --git a/sysdeps/unix/sysv/linux/pread.c b/sysdeps/unix/sysv/linux/pread.c
index 1bcff64..46d974d 100644
--- a/sysdeps/unix/sysv/linux/pread.c
+++ b/sysdeps/unix/sysv/linux/pread.c
@@ -28,8 +28,7 @@
 ssize_t
 __libc_pread (int fd, void *buf, size_t count, off_t offset)
 {
-  return SYSCALL_CANCEL (pread, fd, buf, count,
-			 __ALIGNMENT_ARG SYSCALL_LL (offset));
+  return SYSCALL_CANCEL (pread, fd, buf, count, SYSCALL_LL_PRW (offset));
 }
 
 strong_alias (__libc_pread, __pread)
diff --git a/sysdeps/unix/sysv/linux/pread64.c b/sysdeps/unix/sysv/linux/pread64.c
index 58c6aeb..f51beae 100644
--- a/sysdeps/unix/sysv/linux/pread64.c
+++ b/sysdeps/unix/sysv/linux/pread64.c
@@ -26,8 +26,7 @@
 ssize_t
 __libc_pread64 (int fd, void *buf, size_t count, off64_t offset)
 {
-  return SYSCALL_CANCEL (pread64, fd, buf, count,
-			 __ALIGNMENT_ARG SYSCALL_LL64 (offset));
+  return SYSCALL_CANCEL (pread64, fd, buf, count, SYSCALL_LL64_PRW (offset));
 }
 
 weak_alias (__libc_pread64, __pread64)
diff --git a/sysdeps/unix/sysv/linux/pwrite.c b/sysdeps/unix/sysv/linux/pwrite.c
index 9c502be..1371df8 100644
--- a/sysdeps/unix/sysv/linux/pwrite.c
+++ b/sysdeps/unix/sysv/linux/pwrite.c
@@ -28,8 +28,7 @@
 ssize_t
 __libc_pwrite (int fd, const void *buf, size_t count, off_t offset)
 {
-  return SYSCALL_CANCEL (pwrite, fd, buf, count,
-			 __ALIGNMENT_ARG SYSCALL_LL (offset));
+  return SYSCALL_CANCEL (pwrite, fd, buf, count, SYSCALL_LL_PRW (offset));
 }
 
 strong_alias (__libc_pwrite, __pwrite)
diff --git a/sysdeps/unix/sysv/linux/pwrite64.c b/sysdeps/unix/sysv/linux/pwrite64.c
index b49e6bc..22f1f05 100644
--- a/sysdeps/unix/sysv/linux/pwrite64.c
+++ b/sysdeps/unix/sysv/linux/pwrite64.c
@@ -26,8 +26,7 @@
 ssize_t
 __libc_pwrite64 (int fd, const void *buf, size_t count, off64_t offset)
 {
-  return SYSCALL_CANCEL (pwrite64, fd, buf, count,
-			 __ALIGNMENT_ARG SYSCALL_LL64 (offset));
+  return SYSCALL_CANCEL (pwrite64, fd, buf, count, SYSCALL_LL64_PRW (offset));
 }
 weak_alias (__libc_pwrite64, __pwrite64)
 libc_hidden_weak (__pwrite64)
diff --git a/sysdeps/unix/sysv/linux/sh/kernel-features.h b/sysdeps/unix/sysv/linux/sh/kernel-features.h
index ad05fc3..c5240fa 100644
--- a/sysdeps/unix/sysv/linux/sh/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/sh/kernel-features.h
@@ -44,3 +44,8 @@
 
 /* SH does not have a 64-bit inode field.  */
 #undef __ASSUME_ST_INO_64_BIT
+
+/* SH4 ABI does not really require argument alignment for 64-bits, but
+   the kernel interface for p{read,write}64 adds a dummy long argument
+   before the offset.  */
+#define __ASSUME_PRW_DUMMY_ARG	1
diff --git a/sysdeps/unix/sysv/linux/sh/pread.c b/sysdeps/unix/sysv/linux/sh/pread.c
deleted file mode 100644
index d3f99f3..0000000
--- a/sysdeps/unix/sysv/linux/sh/pread.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
-   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/>.  */
-
-/* SH4 ABI does not really require argument alignment for 64-bits, but
-   the kernel interface for pread adds a dummy long argument before the
-   offset.  */
-#define __ALIGNMENT_ARG
-#include <sysdeps/unix/sysv/linux/pread.c>
diff --git a/sysdeps/unix/sysv/linux/sh/pread64.c b/sysdeps/unix/sysv/linux/sh/pread64.c
deleted file mode 100644
index b2e8a25..0000000
--- a/sysdeps/unix/sysv/linux/sh/pread64.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
-   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/>.  */
-
-/* SH4 ABI does not really require argument alignment for 64-bits, but
-   the kernel interface for pread adds a dummy long argument before the
-   offset.  */
-#define __ALIGNMENT_ARG
-#include <sysdeps/unix/sysv/linux/pread64.c>
diff --git a/sysdeps/unix/sysv/linux/sh/pwrite.c b/sysdeps/unix/sysv/linux/sh/pwrite.c
deleted file mode 100644
index 391ed5e..0000000
--- a/sysdeps/unix/sysv/linux/sh/pwrite.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
-   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/>.  */
-
-/* SH4 ABI does not really require argument alignment for 64-bits, but
-   the kernel interface for pwrite adds a dummy long argument before the
-   offset.  */
-#define __ALIGNMENT_ARG
-#include <sysdeps/unix/sysv/linux/pwrite.c>
diff --git a/sysdeps/unix/sysv/linux/sh/pwrite64.c b/sysdeps/unix/sysv/linux/sh/pwrite64.c
deleted file mode 100644
index 683a5d9..0000000
--- a/sysdeps/unix/sysv/linux/sh/pwrite64.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ralf Baechle <ralf@gnu.org>, 1998.
-
-   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/>.  */
-
-/* SH4 ABI does not really require argument alignment for 64-bits, but
-   the kernel interface for pread adds a dummy long argument before the
-   offset.  */
-#define __ALIGNMENT_ARG
-#include <sysdeps/unix/sysv/linux/pwrite64.c>
diff --git a/sysdeps/unix/sysv/linux/sysdep.h b/sysdeps/unix/sysv/linux/sysdep.h
index a469f57..e3ecd56 100644
--- a/sysdeps/unix/sysv/linux/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sysdep.h
@@ -48,6 +48,16 @@
   __LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff))
 #endif
 
+/* Provide a common macro to pass 64-bit value on pread and pwrite
+   syscalls.  */
+#ifdef __ASSUME_PRW_DUMMY_ARG
+# define SYSCALL_LL_PRW(val)   0, SYSCALL_LL (val)
+# define SYSCALL_LL64_PRW(val) 0, SYSCALL_LL64 (val)
+#else
+# define SYSCALL_LL_PRW(val)   __ALIGNMENT_ARG SYSCALL_LL (val)
+# define SYSCALL_LL64_PRW(val) __ALIGNMENT_ARG SYSCALL_LL64 (val)
+#endif
+
 /* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}.  */
 #define LO_HI_LONG(val) \
  (long) (val), \
-- 
2.7.4
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