From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yury Norov Subject: [PATCH 02/18] arm64: ilp32: add documentation on the ILP32 ABI for ARM64 Date: Fri, 21 Oct 2016 23:33:01 +0300 Message-ID: <1477081997-4770-3-git-send-email-ynorov@caviumnetworks.com> References: <1477081997-4770-1-git-send-email-ynorov@caviumnetworks.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1477081997-4770-1-git-send-email-ynorov@caviumnetworks.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: arnd@arndb.de, catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arch@vger.kernel.org Cc: szabolcs.nagy@arm.com, heiko.carstens@de.ibm.com, cmetcalf@ezchip.com, ynorov@caviumnetworks.com, philipp.tomsich@theobroma-systems.com, joseph@codesourcery.com, zhouchengming1@huawei.com, Prasun.Kapoor@caviumnetworks.com, agraf@suse.de, geert@linux-m68k.org, kilobyte@angband.pl, manuel.montezelo@gmail.com, pinskia@gmail.com, linyongting@huawei.com, klimov.linux@gmail.com, broonie@kernel.org, bamvor.zhangjian@huawei.com, maxim.kuvyrkov@linaro.org, Nathan_Lynch@mentor.com, schwidefsky@de.ibm.com, davem@davemloft.net, christoph.muellner@theobroma-systems.com List-Id: linux-arch.vger.kernel.org Based on Andrew Pinski's patch-series. Signed-off-by: Yury Norov --- Documentation/arm64/ilp32.txt | 46 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 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..b96c18f --- /dev/null +++ b/Documentation/arm64/ilp32.txt @@ -0,0 +1,46 @@ +ILP32 AARCH64 SYSCALL ABI +========================= + +This document describes the ILP32 syscall ABI and where it differs +from the generic compat linux syscall interface. + +AARCH64/ILP32 userspace can potentially access top halves of registers that +are passed as syscall arguments, so such registers (w0-w7) are deloused. + +AARCH64/ILP32 provides next types turned to 64-bit (comparing to AARCH32): +ino_t is u64 type. +off_t is s64 type. +blkcnt_t is s64 type. +fsblkcnt_t is u64 type. +fsfilcnt_t is u64 type. +rlim_t is u64 type. + +AARCH64/ILP32 ABI uses standard syscall table which can be found at +include/uapi/asm-generic/unistd.h, with the exceptions listed below. + +Syscalls which pass 64bit values are handled by the code shared from +AARCH32 and pass that value as a pair. Next syscalls are affected: +fadvise64_64() +fallocate() +ftruncate64() +pread64() +pwrite64() +readahead() +sync_file_range() +truncate64() +sys_mmap() + +ptrace() syscall is handled by compat version. + +shmat() syscall is handled by non-compat handler as aarch64/ilp32 has no +limitation on 4-pages alignment for shared memory. + +statfs() and fstatfs() take the size of sfruct statfs as an argument. +It is calculated differently in kernel and user spaces. So AARCH32 handlers +are taken to handle it. + +struct rt_sigframe is redefined and contains struct compat_siginfo, +as compat syscalls expects, and struct ilp32_sigframe, to handle +AARCH64 register set and 32-bit userspace register representation. + +elf_gregset_t is taken from lp64 to handle registers properly. -- 2.7.4 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-bn3nam01on0058.outbound.protection.outlook.com ([104.47.33.58]:59558 "EHLO NAM01-BN3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932542AbcJUUsJ (ORCPT ); Fri, 21 Oct 2016 16:48:09 -0400 From: Yury Norov Subject: [PATCH 02/18] arm64: ilp32: add documentation on the ILP32 ABI for ARM64 Date: Fri, 21 Oct 2016 23:33:01 +0300 Message-ID: <1477081997-4770-3-git-send-email-ynorov@caviumnetworks.com> In-Reply-To: <1477081997-4770-1-git-send-email-ynorov@caviumnetworks.com> References: <1477081997-4770-1-git-send-email-ynorov@caviumnetworks.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-arch-owner@vger.kernel.org List-ID: To: arnd@arndb.de, catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arch@vger.kernel.org Cc: schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, ynorov@caviumnetworks.com, pinskia@gmail.com, broonie@kernel.org, joseph@codesourcery.com, christoph.muellner@theobroma-systems.com, bamvor.zhangjian@huawei.com, szabolcs.nagy@arm.com, klimov.linux@gmail.com, Nathan_Lynch@mentor.com, agraf@suse.de, Prasun.Kapoor@caviumnetworks.com, kilobyte@angband.pl, geert@linux-m68k.org, philipp.tomsich@theobroma-systems.com, manuel.montezelo@gmail.com, linyongting@huawei.com, maxim.kuvyrkov@linaro.org, davem@davemloft.net, zhouchengming1@huawei.com, cmetcalf@ezchip.com Message-ID: <20161021203301.RVu56gMgYDTRNoQ-05IXy2tQTbNzGAXaSrM3v4wNkBM@z> Based on Andrew Pinski's patch-series. Signed-off-by: Yury Norov --- Documentation/arm64/ilp32.txt | 46 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 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..b96c18f --- /dev/null +++ b/Documentation/arm64/ilp32.txt @@ -0,0 +1,46 @@ +ILP32 AARCH64 SYSCALL ABI +========================= + +This document describes the ILP32 syscall ABI and where it differs +from the generic compat linux syscall interface. + +AARCH64/ILP32 userspace can potentially access top halves of registers that +are passed as syscall arguments, so such registers (w0-w7) are deloused. + +AARCH64/ILP32 provides next types turned to 64-bit (comparing to AARCH32): +ino_t is u64 type. +off_t is s64 type. +blkcnt_t is s64 type. +fsblkcnt_t is u64 type. +fsfilcnt_t is u64 type. +rlim_t is u64 type. + +AARCH64/ILP32 ABI uses standard syscall table which can be found at +include/uapi/asm-generic/unistd.h, with the exceptions listed below. + +Syscalls which pass 64bit values are handled by the code shared from +AARCH32 and pass that value as a pair. Next syscalls are affected: +fadvise64_64() +fallocate() +ftruncate64() +pread64() +pwrite64() +readahead() +sync_file_range() +truncate64() +sys_mmap() + +ptrace() syscall is handled by compat version. + +shmat() syscall is handled by non-compat handler as aarch64/ilp32 has no +limitation on 4-pages alignment for shared memory. + +statfs() and fstatfs() take the size of sfruct statfs as an argument. +It is calculated differently in kernel and user spaces. So AARCH32 handlers +are taken to handle it. + +struct rt_sigframe is redefined and contains struct compat_siginfo, +as compat syscalls expects, and struct ilp32_sigframe, to handle +AARCH64 register set and 32-bit userspace register representation. + +elf_gregset_t is taken from lp64 to handle registers properly. -- 2.7.4