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Date: Fri, 2 Sep 2016 18:46:19 +0800
From: Bamvor Jian Zhang <bamvor.zhangjian@...wei.com>
To: Yury Norov <ynorov@...iumnetworks.com>, <arnd@...db.de>,
<catalin.marinas@....com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-arch@...r.kernel.org>, <libc-alpha@...rceware.org>
CC: <schwidefsky@...ibm.com>, <heiko.carstens@...ibm.com>,
<pinskia@...il.com>, <broonie@...nel.org>,
<joseph@...esourcery.com>,
<christoph.muellner@...obroma-systems.com>,
<szabolcs.nagy@....com>, <klimov.linux@...il.com>,
<Nathan_Lynch@...tor.com>, <agraf@...e.de>,
<Prasun.Kapoor@...iumnetworks.com>, <kilobyte@...band.pl>,
<geert@...ux-m68k.org>, <philipp.tomsich@...obroma-systems.com>,
<manuel.montezelo@...il.com>, <linyongting@...wei.com>,
<maxim.kuvyrkov@...aro.org>, <davem@...emloft.net>,
<zhouchengming1@...wei.com>, <cmetcalf@...hip.com>,
Andrew Pinski <apinski@...ium.com>,
Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
Hanjun Guo <guohanjun@...wei.com>,
chenjianguo 00365834 <chenjianguo3@...wei.com>,
jijun 00321192 <jijun2@...wei.com>,
"zhangjian 00293696" <bamvor.zhangjian@...wei.com>
Subject: Re: [PATCH 12/18] arm64: ilp32: add sys_ilp32.c and a separate table
(in entry.S) to use it
Hi, Yury
On 08/17/2016 07:46 PM, Yury Norov wrote:
> From: Andrew Pinski <apinski@...ium.com>
>
[...]
> diff --git a/arch/arm64/kernel/sys_ilp32.c b/arch/arm64/kernel/sys_ilp32.c
> new file mode 100644
> index 0000000..10fc0ca
> --- /dev/null
> +++ b/arch/arm64/kernel/sys_ilp32.c
> @@ -0,0 +1,86 @@
> +/*
> + * AArch64- ILP32 specific system calls implementation
> + *
> + * Copyright (C) 2016 Cavium Inc.
> + * Author: Andrew Pinski <apinski@...ium.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#define __SYSCALL_COMPAT
> +
> +#include <linux/compiler.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/mm.h>
> +#include <linux/msg.h>
> +#include <linux/export.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/syscalls.h>
> +#include <linux/compat.h>
> +#include <asm-generic/syscalls.h>
> +
> +/*
> + * Using aarch32 syscall handlerss where off_t is passed.
> + */
> +#define compat_sys_fadvise64_64 compat_sys_fadvise64_64_wrapper
> +#define compat_sys_fallocate compat_sys_fallocate_wrapper
> +#define compat_sys_fcntl64 sys_fcntl
> +#define compat_sys_ftruncate64 compat_sys_ftruncate64_wrapper
> +#define compat_sys_pread64 compat_sys_pread64_wrapper
> +#define compat_sys_pwrite64 compat_sys_pwrite64_wrapper
> +#define compat_sys_readahead compat_sys_readahead_wrapper
> +#define compat_sys_shmat sys_shmat
> +#define compat_sys_sync_file_range compat_sys_sync_file_range2_wrapper
> +#define compat_sys_truncate64 compat_sys_truncate64_wrapper
When we test sync_file_range with our own testcase, we found that the parameter
sequence is not correct for sync_file_range2 because glibc think kernel use
the sync_file_range. So, in this patch we force to sync_file_range2.
Is it make sense to you?
Regards
Bamvor
>From e730e4db23bca4dd0ff6bcca0bc4c04e5c13b5c7 Mon Sep 17 00:00:00 2001
From: Bamvor Jian Zhang <bamvor.zhangjian@...wei.com>
Date: Sat, 27 Aug 2016 12:26:31 +0800
Subject: [PATCH] arm64:ilp32: force sync_file_range2
Define __ARCH_WANT_SYNC_FILE_RANGE2 in order to select correct
sync_file_range parameters sequence in glibc and kernel.
Tested-by: Jianguo Chen <chenjianguo3@...wei.com>
Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@...wei.com>
---
arch/arm64/include/uapi/asm/unistd.h | 5 +++++
arch/arm64/kernel/sys_ilp32.c | 2 +-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/uapi/asm/unistd.h b/arch/arm64/include/uapi/asm/unistd.h
index 043d17a..78bea1d 100644
--- a/arch/arm64/include/uapi/asm/unistd.h
+++ b/arch/arm64/include/uapi/asm/unistd.h
@@ -16,4 +16,9 @@
#define __ARCH_WANT_RENAMEAT
+/* We need to make sure it works for both userspace and kernel(sys_ilp32.c) */
+#if defined(__ILP32__) || defined(__SYSCALL_COMPAT)
+#define __ARCH_WANT_SYNC_FILE_RANGE2
+#endif
+
#include <asm-generic/unistd.h>
diff --git a/arch/arm64/kernel/sys_ilp32.c b/arch/arm64/kernel/sys_ilp32.c
index 10fc0ca..13c9c9d 100644
--- a/arch/arm64/kernel/sys_ilp32.c
+++ b/arch/arm64/kernel/sys_ilp32.c
@@ -42,7 +42,7 @@
#define compat_sys_pwrite64 compat_sys_pwrite64_wrapper
#define compat_sys_readahead compat_sys_readahead_wrapper
#define compat_sys_shmat sys_shmat
-#define compat_sys_sync_file_range compat_sys_sync_file_range2_wrapper
+#define compat_sys_sync_file_range2 compat_sys_sync_file_range2_wrapper
#define compat_sys_truncate64 compat_sys_truncate64_wrapper
#define sys_mmap2 compat_sys_mmap2_wrapper
#define sys_ptrace compat_sys_ptrace
--
1.8.4.5
> +#define sys_mmap2 compat_sys_mmap2_wrapper
> +#define sys_ptrace compat_sys_ptrace
> +
> +/*
> + * Use non-compat syscall handlers where rlimit, stat and statfs
> + * structure pointers are passed, as their layout is identical to LP64.
> + */
> +#define compat_sys_fstatfs64 sys_fstatfs
> +#define compat_sys_statfs64 sys_statfs
> +#define sys_fstat64 sys_newfstat
> +#define sys_fstatat64 sys_newfstatat
> +#define compat_sys_getrlimit sys_getrlimit
> +#define compat_sys_setrlimit sys_setrlimit
> +
> +asmlinkage long compat_sys_fadvise64_64_wrapper(void);
> +asmlinkage long compat_sys_fallocate_wrapper(void);
> +asmlinkage long compat_sys_ftruncate64_wrapper(void);
> +asmlinkage long compat_sys_mmap2_wrapper(void);
> +asmlinkage long compat_sys_pread64_wrapper(void);
> +asmlinkage long compat_sys_pwrite64_wrapper(void);
> +asmlinkage long compat_sys_readahead_wrapper(void);
> +asmlinkage long compat_sys_sync_file_range2_wrapper(void);
> +asmlinkage long compat_sys_truncate64_wrapper(void);
> +
> +asmlinkage long ilp32_sys_rt_sigreturn_wrapper(void);
> +#define compat_sys_rt_sigreturn ilp32_sys_rt_sigreturn_wrapper
> +
> +#include <asm/syscall.h>
> +
> +#undef __SYSCALL
> +#define __SYSCALL(nr, sym) [nr] = sym,
> +
> +/*
> + * The sys_call_ilp32_table array must be 4K aligned to be accessible from
> + * kernel/entry.S.
> + */
> +void *sys_call_ilp32_table[__NR_syscalls] __aligned(4096) = {
> + [0 ... __NR_syscalls - 1] = sys_ni_syscall,
> +#include <asm/unistd.h>
> +};
>
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