From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932714AbbDMUTX (ORCPT ); Mon, 13 Apr 2015 16:19:23 -0400 Received: from vegas.theobroma-systems.com ([144.76.126.164]:43265 "EHLO mail.theobroma-systems.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932424AbbDMUTU (ORCPT ); Mon, 13 Apr 2015 16:19:20 -0400 From: Philipp Tomsich To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Philipp Tomsich , Andrew Pinski , Christoph Muellner , Benedikt Huber , Andreas Kraschitzer , Kumar Sankaran , Catalin Marinas Subject: [PATCH v4 01/24] arm64:ilp32: add documentation on the ILP32 ABI for ARM64 Date: Mon, 13 Apr 2015 21:44:11 +0200 Message-Id: <226587ecb31288d94c5c93c7df85fd1ca4ca474a.1428953303.git.philipp.tomsich@theobroma-systems.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Based on Andrew Pinski's original patch-series and adapted with changes to reduce the duplication of code-paths and resolve issue found during LTP testing. Signed-off-by: Philipp Tomsich Signed-off-by: Christoph Muellner --- Documentation/arm64/ilp32.txt | 64 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 Documentation/arm64/ilp32.txt diff --git a/Documentation/arm64/ilp32.txt b/Documentation/arm64/ilp32.txt new file mode 100644 index 0000000..7524d06 --- /dev/null +++ b/Documentation/arm64/ilp32.txt @@ -0,0 +1,64 @@ +ILP32 AARCH64 SYSCALL ABI +========================= +Written by Andrew Pinski +Updated by Philipp Tomsich + + +This document describes the ILP32 syscall ABI and where it differs +from the generic linux syscall interface. + +ILP32 sets __kernel_long_t and __kernel_ulong_t both to 64bit. This +affects the following type definitions for ILP32 client programs: + * time_t unsigned long long + * clock_t unsigned long long + * fsword_t long long + * suseconds_t long long + * swblk_t long long + * fd_mask_t long long + +Some structures are changed to reduce the difference in the code path +for both ILP32 and LP64 ABIs for signal handling. + +The following structures have been changed so the layout of the +structures are the same between ILP32 and LP64 ABIs, including: + * timespec uses time_t and suseconds_t + * timeval uses time_t and suseconds_t + * stat uses timespec/time_t + * semid64_ds uses time_t. + * msqid64_ds uses time_t. + * shmid64_ds uses time_t. + * rt_sigframe uses siginfo and ucontext. + * siginfo_t uses clock_t and sigval_t + * ucontext uses stack_t and sigset_t + * sigval_t contains pointers + * sigevent Uses sigval_t which causes it to be the same. Special + handing is needed for reading; in the mq_notify syscall + * sigaction Conversion is handled in the userland (glibc), as the + userland data structures are defined in glibc anyway. + * fd_set This is done to avoid endian issues between ILP32 and + LP64. Syscalls consuming fd_set use timespec. + +A number of structures differ between ILP32 and LP64, including: + * struct msgbuf The specification of 'struct msgbuf' defines the 'mtype' + field as a 'long' (i.e. 32bit for ILP32, but 64bit for + LP64). Functions that operate on 'struct msgbuf' need + to be passed through the compat-syscalls to resolve + this. + * stack_t contains pointers (handled in the compatibility layer) + +Also the syscalls which normally would pass 64bit values as two arguments; +now pass the 64bit value as one argument. Also they have been renamed +(removing the 64 from the name) to avoid confusion. +The list of these LP64 syscalls reused by ILP32 clients is: + * fcntl + * statfs + * fstatfs + * truncate + * ftruncate + * lseek + * sendfile + * newfstatat + * fstat + * mmap + * fadvise64 + -- 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: philipp.tomsich@theobroma-systems.com (Philipp Tomsich) Date: Mon, 13 Apr 2015 21:44:11 +0200 Subject: [PATCH v4 01/24] arm64:ilp32: add documentation on the ILP32 ABI for ARM64 In-Reply-To: References: Message-ID: <226587ecb31288d94c5c93c7df85fd1ca4ca474a.1428953303.git.philipp.tomsich@theobroma-systems.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Based on Andrew Pinski's original patch-series and adapted with changes to reduce the duplication of code-paths and resolve issue found during LTP testing. Signed-off-by: Philipp Tomsich Signed-off-by: Christoph Muellner --- Documentation/arm64/ilp32.txt | 64 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 Documentation/arm64/ilp32.txt diff --git a/Documentation/arm64/ilp32.txt b/Documentation/arm64/ilp32.txt new file mode 100644 index 0000000..7524d06 --- /dev/null +++ b/Documentation/arm64/ilp32.txt @@ -0,0 +1,64 @@ +ILP32 AARCH64 SYSCALL ABI +========================= +Written by Andrew Pinski +Updated by Philipp Tomsich + + +This document describes the ILP32 syscall ABI and where it differs +from the generic linux syscall interface. + +ILP32 sets __kernel_long_t and __kernel_ulong_t both to 64bit. This +affects the following type definitions for ILP32 client programs: + * time_t unsigned long long + * clock_t unsigned long long + * fsword_t long long + * suseconds_t long long + * swblk_t long long + * fd_mask_t long long + +Some structures are changed to reduce the difference in the code path +for both ILP32 and LP64 ABIs for signal handling. + +The following structures have been changed so the layout of the +structures are the same between ILP32 and LP64 ABIs, including: + * timespec uses time_t and suseconds_t + * timeval uses time_t and suseconds_t + * stat uses timespec/time_t + * semid64_ds uses time_t. + * msqid64_ds uses time_t. + * shmid64_ds uses time_t. + * rt_sigframe uses siginfo and ucontext. + * siginfo_t uses clock_t and sigval_t + * ucontext uses stack_t and sigset_t + * sigval_t contains pointers + * sigevent Uses sigval_t which causes it to be the same. Special + handing is needed for reading; in the mq_notify syscall + * sigaction Conversion is handled in the userland (glibc), as the + userland data structures are defined in glibc anyway. + * fd_set This is done to avoid endian issues between ILP32 and + LP64. Syscalls consuming fd_set use timespec. + +A number of structures differ between ILP32 and LP64, including: + * struct msgbuf The specification of 'struct msgbuf' defines the 'mtype' + field as a 'long' (i.e. 32bit for ILP32, but 64bit for + LP64). Functions that operate on 'struct msgbuf' need + to be passed through the compat-syscalls to resolve + this. + * stack_t contains pointers (handled in the compatibility layer) + +Also the syscalls which normally would pass 64bit values as two arguments; +now pass the 64bit value as one argument. Also they have been renamed +(removing the 64 from the name) to avoid confusion. +The list of these LP64 syscalls reused by ILP32 clients is: + * fcntl + * statfs + * fstatfs + * truncate + * ftruncate + * lseek + * sendfile + * newfstatat + * fstat + * mmap + * fadvise64 + -- 1.9.1