linux-kernel - Re: [PATCH 11/27] [AARCH64] Syscalls for ILP32 are passed always via 64bit values.

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Date:	Tue, 21 Jun 2016 13:54:36 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	"Zhangjian \(Bamvor\)" <bamvor.zhangjian@...wei.com>
Cc:	Yury Norov <ynorov@...iumnetworks.com>,
	<libc-alpha@...rceware.org>, <linux-kernel@...r.kernel.org>,
	<arnd@...db.de>, <catalin.marinas@....com>,
	<marcus.shawcroft@....com>, <philb@....org>, <davem@...emloft.net>,
	<szabolcs.nagy@....com>, <maxim.kuvyrkov@...aro.org>,
	<joseph@...esourcery.com>, <pinskia@...il.com>,
	Andrew Pinski <apinski@...ium.com>, <gaoyongliang@...wei.com>
Subject: Re: [PATCH 11/27] [AARCH64] Syscalls for ILP32 are passed always via 64bit values.

"Zhangjian (Bamvor)" <bamvor.zhangjian@...wei.com> writes:

> Hi,
>
> On 2016/6/21 15:56, Andreas Schwab wrote:
>> Yury Norov <ynorov@...iumnetworks.com> writes:
>>
>>> diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
>>> index 1ffabc2..42f89c8 100644
>>> --- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
>>> +++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
>>> @@ -161,11 +161,11 @@
>>>      call.  */
>>>   # undef INLINE_SYSCALL
>>>   # define INLINE_SYSCALL(name, nr, args...)				\
>>> -  ({ unsigned long _sys_result = INTERNAL_SYSCALL (name, , nr, args);	\
>>> +  ({ unsigned long long _sys_result = INTERNAL_SYSCALL (name, , nr, args);	\
>>>        if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0))\
>>>          {								\
>>>   	 __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, ));		\
>>> -	 _sys_result = (unsigned long) -1;				\
>>> +	 _sys_result = (unsigned long long) -1;				\
>>>          }								\
>>>        (long) _sys_result; })
>>
>> The cast should be (long long).
> My understanding that we need more conversion, reference the follow patch:

And this:

diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.c b/sysdeps/unix/sysv/linux/aarch64/sysdep.c
index f2d5480..1bec443 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sysdep.c
+++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.c
@@ -19,13 +19,13 @@
 #include <sysdep.h>
 #include <errno.h>
 
-long __syscall_error (long err);
+long long __syscall_error (long long err);
 hidden_proto (__syscall_error)
 
 /* This routine is jumped to by all the syscall handlers, to stash
    an error number into errno.  */
-long
-__syscall_error (long err)
+long long
+__syscall_error (long long err)
 {
   __set_errno (- err);
   return -1;

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@...e.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."