From: Yury Norov <ynorov@caviumnetworks.com>
To: "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
<linux-arm-kernel@lists.infradead.org>,
<linux-doc@vger.kernel.org>,
Andrew Pinski <Andrew.Pinski@caviumnetworks.com>,
<catalin.marinas@arm.com>, <heiko.carstens@de.ibm.com>,
Hanjun Guo <guohanjun@huawei.com>, <joseph@codesourcery.com>,
<linux-arch@vger.kernel.org>, <linux-s390@vger.kernel.org>,
"jijun (D)" <jijun2@huawei.com>,
<Prasun.Kapoor@caviumnetworks.com>, <schwab@suse.de>,
<agraf@suse.de>, <pinskia@gmail.com>, <klimov.linux@gmail.com>,
<broonie@kernel.org>, <Nathan_Lynch@mentor.com>,
<linux-kernel@vger.kernel.org>,
Andrew Pinski <apinski@cavium.com>, <schwidefsky@de.ibm.com>,
<christoph.muellner@theobroma-systems.com>
Subject: Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it
Date: Thu, 12 May 2016 11:24:27 +0300 [thread overview]
Message-ID: <20160512082427.GA1587@yury-N73SV> (raw)
In-Reply-To: <5733FC71.8070101@huawei.com>
On Thu, May 12, 2016 at 11:45:53AM +0800, Zhangjian (Bamvor) wrote:
[...]
> >Hmm, that is indeed tricky. I think COMPAT_SYSCALL_WRAP4 rightfully
> >refuses the loff_t argument here, as the common case is that this is
> >not possible.
> It works if I apply the following patch, I defined the wrong `__TYPE_IS_xxx`
> yesterday. Should we merge this into ILP32 series or send the compat.h
> and syscalls.h individually? The current series of ILP32 is a little bit
> long and hard to review.
> diff --git a/include/linux/compat.h b/include/linux/compat.h
> index ba6ebe0..22a9565 100644
> --- a/include/linux/compat.h
> +++ b/include/linux/compat.h
> @@ -747,7 +747,8 @@ asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
> #ifndef __SC_COMPAT_CAST
> #define __SC_COMPAT_CAST(t, a) ({ \
> BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \
> - !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t)); \
> + !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) && \
> + !__TYPE_IS_LOFFT(t)); \
I think it's wrong, as loff_t is 64-bit in 32-bit userspace, and this
will clear meaningful data in top halve.
> ((t) ((t)(-1) < 0 ? (s64)(s32)(a) : (u64)(u32)(a))); \
> })
> #endif
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index 6e57d9c..66eb85d 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -47,6 +47,7 @@
> #define __TYPE_IS_L(t) (__same_type((t)0, 0L))
> #define __TYPE_IS_UL(t) (__same_type((t)0, 0UL))
> #define __TYPE_IS_LL(t) (__same_type((t)0, 0LL) || __same_type((t)0, 0ULL))
> +#define __TYPE_IS_LOFFT(t) (__same_type((t)0, (loff_t)0))
> #define __SC_LONG(t, a) __typeof(__builtin_choose_expr(__TYPE_IS_LL(t), 0LL, 0L)) a
> #define __SC_CAST(t, a) (t) a
> #define __SC_ARGS(t, a) a
> diff --git a/kernel/compat_wrapper.c b/kernel/compat_wrapper.c
> index 98b68b8..28f02d0 100644
> --- a/kernel/compat_wrapper.c
> +++ b/kernel/compat_wrapper.c
> @@ -304,3 +304,7 @@ COMPAT_SYSCALL_WRAP3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
> COMPAT_SYSCALL_WRAP6(sendto, int, fd, void __user *, buff, size_t, len,
> unsigned int, flags, struct sockaddr __user *, addr,
> int, addr_len);
> +COMPAT_SYSCALL_WRAP4(pread64, unsigned int, fd, char __user *, buf,
> + size_t, count, loff_t, pos);
> +COMPAT_SYSCALL_WRAP4(pwrite64, unsigned int, fd, const char __user *, buf,
> + size_t, count, loff_t, pos);
For cases like this I think we should write wrappers by hands. In
unistd.h we can use __SC_WRAP, so they will work like wrappers
generated by COMPAT_SYSCALL_WRAPx()
next prev parent reply other threads:[~2016-05-12 8:24 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-05 22:08 [RFC6 PATCH v6 00/21] ILP32 for ARM64 Yury Norov
2016-04-05 22:08 ` [PATCH 01/25] all: syscall wrappers: add documentation Yury Norov
2016-04-05 22:08 ` [PATCH 02/25] all: introduce COMPAT_WRAPPER option and enable it for s390 Yury Norov
2016-04-05 22:08 ` [PATCH 03/25] all: s390: move wrapper infrastructure to generic headers Yury Norov
2016-04-05 22:08 ` [PATCH 04/25] all: s390: move compat_wrappers.c from arch/s390/kernel to kernel/ Yury Norov
2016-04-05 22:08 ` [PATCH 05/25] all: wrap needed syscalls in generic unistd Yury Norov
2016-04-05 22:08 ` [PATCH 06/25] compat ABI: use non-compat openat and open_by_handle_at variants Yury Norov
2016-04-05 22:08 ` [PATCH 07/25] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option Yury Norov
2016-04-05 22:08 ` [PATCH 08/25] arm64: ilp32: add documentation on the ILP32 ABI for ARM64 Yury Norov
2016-04-05 22:08 ` [PATCH 09/25] arm64: ensure the kernel is compiled for LP64 Yury Norov
2016-04-05 22:08 ` [PATCH 10/25] arm64: rename COMPAT to AARCH32_EL0 in Kconfig Yury Norov
2016-04-14 3:20 ` Zhangjian (Bamvor)
2016-04-22 15:28 ` Catalin Marinas
2016-04-05 22:08 ` [PATCH 11/25] arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0 instead Yury Norov
2016-04-05 22:08 ` [PATCH 12/25] arm64: compat: change config dependences to aarch32 Yury Norov
2016-04-22 15:58 ` Catalin Marinas
2016-04-22 21:59 ` Yury Norov
2016-04-23 2:33 ` Zhangjian (Bamvor)
2016-04-05 22:08 ` [PATCH 13/25] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64 Yury Norov
2016-04-05 22:08 ` [PATCH 14/25] thread: move thread bits accessors to separated file Yury Norov
2016-04-05 22:08 ` [PATCH 15/25] arm64: introduce is_a32_task and is_a32_thread (for AArch32 compat) Yury Norov
2016-05-06 12:02 ` Zhangjian (Bamvor)
2016-04-05 22:08 ` [PATCH 16/25] arm64: ilp32: add is_ilp32_compat_{task,thread} and TIF_32BIT_AARCH64 Yury Norov
2016-04-05 22:08 ` [PATCH 17/25] arm64: introduce binfmt_elf32.c Yury Norov
2016-04-05 22:08 ` [PATCH 18/25] arm64: ilp32: introduce binfmt_ilp32.c Yury Norov
2016-04-22 16:51 ` Catalin Marinas
2016-04-22 17:41 ` Arnd Bergmann
2016-04-05 22:08 ` [PATCH 19/25] arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32 Yury Norov
2016-04-22 17:10 ` Catalin Marinas
2016-04-22 21:40 ` Yury Norov
2016-04-25 16:57 ` Catalin Marinas
2016-04-05 22:08 ` [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Yury Norov
2016-04-25 17:26 ` Catalin Marinas
2016-04-25 18:19 ` Yury Norov
2016-04-25 18:47 ` Yury Norov
2016-04-26 10:08 ` Catalin Marinas
2016-04-26 16:57 ` Catalin Marinas
2016-04-28 19:19 ` Yury Norov
2016-04-28 20:43 ` Arnd Bergmann
2016-04-28 22:21 ` Yury Norov
2016-04-28 22:43 ` Arnd Bergmann
2016-04-29 13:13 ` Yury Norov
2016-04-29 15:45 ` Arnd Bergmann
2016-05-06 12:16 ` Zhangjian (Bamvor)
2016-05-06 12:37 ` Yury Norov
2016-05-10 7:42 ` Zhangjian (Bamvor)
2016-05-10 7:55 ` Zhangjian (Bamvor)
2016-05-10 8:36 ` Arnd Bergmann
2016-05-10 9:47 ` Zhangjian (Bamvor)
2016-05-10 11:48 ` Arnd Bergmann
2016-05-10 12:39 ` Zhangjian (Bamvor)
2016-05-10 12:50 ` Arnd Bergmann
2016-05-11 2:04 ` Zhangjian (Bamvor)
2016-05-11 8:04 ` Yury Norov
2016-05-11 10:55 ` Arnd Bergmann
2016-05-11 16:59 ` Catalin Marinas
2016-05-11 19:30 ` Arnd Bergmann
2016-05-12 9:17 ` Catalin Marinas
2016-05-12 9:21 ` Arnd Bergmann
2016-05-12 12:49 ` Zhangjian (Bamvor)
2016-05-12 13:06 ` Arnd Bergmann
2016-05-12 13:19 ` Yury Norov
2016-05-14 12:49 ` Yury Norov
2016-05-11 8:09 ` Arnd Bergmann
2016-05-11 10:12 ` Zhangjian (Bamvor)
2016-05-11 11:16 ` Zhangjian (Bamvor)
2016-05-11 14:50 ` Arnd Bergmann
2016-05-12 3:45 ` Zhangjian (Bamvor)
2016-05-12 8:24 ` Yury Norov [this message]
2016-05-12 12:52 ` Zhangjian (Bamvor)
2016-05-12 12:59 ` Yury Norov
2016-05-14 15:03 ` Yury Norov
2016-05-16 17:06 ` Catalin Marinas
2016-05-17 19:05 ` Yury Norov
2016-05-18 11:21 ` Catalin Marinas
2016-05-18 17:58 ` Yury Norov
2016-04-05 22:08 ` [PATCH 21/25] arm64: signal: share lp64 signal routines to ilp32 Yury Norov
2016-04-05 22:08 ` [PATCH 22/25] arm64: signal32: move ilp32 and aarch32 common code to separated file Yury Norov
2016-04-05 22:08 ` [PATCH 23/25] arm64: ilp32: introduce ilp32-specific handlers for sigframe and ucontext Yury Norov
2016-04-05 22:08 ` [PATCH 24/25] arm64:ilp32: add vdso-ilp32 and use for signal return Yury Norov
2016-04-13 9:19 ` Zhangjian (Bamvor)
2016-04-13 15:55 ` Yury Norov
2016-05-03 12:49 ` Zhangjian (Bamvor)
2016-04-29 16:01 ` Catalin Marinas
2016-04-29 17:30 ` Arnd Bergmann
2016-05-03 9:00 ` Catalin Marinas
2016-05-03 9:05 ` Arnd Bergmann
2016-05-03 11:07 ` Zhangjian (Bamvor)
2016-05-03 12:41 ` Zhangjian (Bamvor)
2016-05-04 21:49 ` Yury Norov
2016-05-04 23:23 ` Andrew Pinski
2016-05-05 2:24 ` Zhangjian (Bamvor)
2016-05-05 6:40 ` Andrew Pinski
2016-05-06 14:00 ` Yury Norov
2016-05-09 10:07 ` Zhangjian (Bamvor)
2016-05-05 8:22 ` Yury Norov
2016-04-05 22:08 ` [PATCH 25/25] arm64:ilp32: add ARM64_ILP32 to Kconfig Yury Norov
2016-04-29 16:03 ` Catalin Marinas
2016-04-29 16:08 ` Yury Norov
2016-04-29 16:14 ` Catalin Marinas
2016-04-29 16:26 ` Yury Norov
2016-04-05 22:44 ` [RFC6 PATCH v6 00/21] ILP32 for ARM64 - LTP results Yury Norov
2016-04-23 3:37 ` Zhangjian (Bamvor)
2016-04-27 7:30 ` Andrew Pinski
2016-04-27 21:15 ` Andrew Pinski
2016-04-28 12:16 ` Zhangjian (Bamvor)
2016-04-06 6:51 ` [RFC6 PATCH v6 00/21] ILP32 for ARM64 Geert Uytterhoeven
2016-04-06 12:29 ` Yury Norov
2016-04-07 12:28 ` Geert Uytterhoeven
2016-05-12 0:20 ` Yury Norov
2016-05-12 9:19 ` Arnd Bergmann
2016-05-12 10:30 ` Yury Norov
2016-05-12 13:35 ` Catalin Marinas
2016-05-12 13:44 ` Yury Norov
2016-05-12 14:07 ` Catalin Marinas
2016-05-12 14:20 ` Catalin Marinas
2016-05-12 14:34 ` Yury Norov
2016-05-12 14:54 ` Catalin Marinas
2016-05-12 15:27 ` Yury Norov
2016-05-12 14:24 ` Yury Norov
2016-05-12 15:28 ` Catalin Marinas
2016-05-13 8:11 ` Zhangjian (Bamvor)
2016-05-13 9:28 ` Catalin Marinas
2016-05-13 10:51 ` Yury Norov
2016-05-13 11:03 ` Catalin Marinas
2016-05-13 13:32 ` Catalin Marinas
2016-05-17 12:10 ` Szabolcs Nagy
2016-05-17 15:37 ` Arnd Bergmann
2016-05-17 15:45 ` Joseph Myers
2016-05-17 16:02 ` Andreas Schwab
2016-05-17 22:45 ` Arnd Bergmann
2016-05-17 15:40 ` Joseph Myers
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