linux-kernel - [PATCH v6 01/19] arm64:ilp32: add documentation on the ILP32 ABI for ARM64

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Message-ID: <1447795019-30176-2-git-send-email-ynorov@caviumnetworks.com>
Date:	Wed, 18 Nov 2015 00:16:41 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	<arnd@...db.de>, <catalin.marinas@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	<pinskia@...il.com>, <ddaney.cavm@...il.com>,
	<jan.dakinevich@...il.com>, <Prasun.Kapoor@...iumnetworks.com>,
	<christoph.muellner@...obroma-systems.com>,
	<philipp.tomsich@...obroma-systems.com>, <broonie@...nel.org>,
	<andrey.konovalov@...aro.org>, <Nathan_Lynch@...tor.com>,
	<agraf@...e.de>, <bamvor.zhangjian@...wei.com>,
	<klimov.linux@...il.com>, <joseph@...esourcery.com>,
	<schwab@...e.de>, Yury Norov <ynorov@...iumnetworks.com>
Subject: [PATCH v6 01/19] arm64:ilp32: add documentation on the ILP32 ABI for ARM64

From: Philipp Tomsich <philipp.tomsich@...obroma-systems.com>

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.

Reviewed-by: David Daney <ddaney@...iumnetworks.com>


Signed-off-by: Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
Signed-off-by: Andrew Pinski <Andrew.Pinski@...iumnetworks.com>
---
 Documentation/arm64/ilp32.txt | 47 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 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..93c09f2
--- /dev/null
+++ b/Documentation/arm64/ilp32.txt
@@ -0,0 +1,47 @@
+ILP32 AARCH64 SYSCALL ABI
+=========================
+Written by Andrew Pinski <apinski@...ium.com>
+Updated by Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
+Updated by Yury Norov <ynorov@...iumnetworks.com>
+
+
+This document describes the ILP32 syscall ABI and where it differs
+from the generic linux syscall interface.
+
+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:
+ * 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.
+
+A number of structures differ between ILP32 and LP64, 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
+ * fd_set          This is done to avoid endian issues between ILP32 and
+		   LP64. Syscalls consuming fd_set use timespec.
+ * 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 LP64 syscalls reused by ILP32 clients, and syscalls having
+ILP32-specific handlers is in arch/arm64/kernel/sys_ilp32.c
+
-- 
2.1.4

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