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Miller" , Florian Weimer , Geert Uytterhoeven , Heiko Carstens , James Hogan , James Morse , Joseph Myers , Lin Yongting , Manuel Montezelo , Mark Brown , Martin Schwidefsky , Maxim Kuvyrkov , Nathan_Lynch , Philipp Tomsich , Prasun Kapoor , Ramana Radhakrishnan , Steve Ellcey , Szabolcs Nagy Subject: [PATCH 07/24] arm64: ilp32: add documentation on the ILP32 ABI for ARM64 Date: Wed, 16 May 2018 11:18:52 +0300 Message-Id: <20180516081910.10067-8-ynorov@caviumnetworks.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180516081910.10067-1-ynorov@caviumnetworks.com> References: <20180516081910.10067-1-ynorov@caviumnetworks.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [176.59.36.13] X-ClientProxiedBy: VI1PR08CA0115.eurprd08.prod.outlook.com (2603:10a6:800:d4::17) To BYAPR07MB4374.namprd07.prod.outlook.com (2603:10b6:a02:c0::17) X-MS-PublicTrafficType: Email X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(5600026)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7153060)(7193020);SRVR:BYAPR07MB4374; 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Signed-off-by: Yury Norov --- Documentation/arm64/ilp32.txt | 45 +++++++++++++++++++++++++++++++++++ 1 file changed, 45 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 000000000000..d0fd5109c4b2 --- /dev/null +++ b/Documentation/arm64/ilp32.txt @@ -0,0 +1,45 @@ +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 pass garbage in the top halve of w0-w7 registers +(syscall arguments). So top 32 bits are zeroed for them. + +Comparing to AARCH32, AARCH64/ILP32 has 64-bit length of following types: +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 64-bit values are handled by the code shared from +AARCH32 and pass that value as a pair. Following syscalls are affected: +fadvise64_64() +fallocate() +ftruncate64() +pread64() +pwrite64() +readahead() +sync_file_range() +truncate64() + +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 struct 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 expect, and struct ilp32_ucontext, to handle +AARCH64 register set and 32-bit userspace register representation. + +elf_gregset_t is taken from lp64 to handle registers properly. -- 2.17.0