linux-kernel - Re: Userspace compiler support of "long long"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <B3C8EEBF-71FB-4169-8ED7-7C4A410BBEE1@mac.com>
Date:	Wed, 27 Jun 2007 18:30:52 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	LKML Kernel <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>, david@...g.hm,
	linux-arch@...r.kernel.org
Subject: Re: Userspace compiler support of "long long"

On Jun 27, 2007, at 13:32:40, Adrian Bunk wrote:
> AFAIR the Intel compiler claims to be gcc.
>
> But these are by far not the only C compilers under Linux, and the  
> more important points are:
>
> Is there any userspace Linux compiler that does not support "long  
> long"?

Don't know, but I'd guess not.

> If yes, is there any other way to tell that something is a 64bit  
> int on 32bit architectures?

Not that I know of.  Probably the straight #else conditional is OK.   
We should also merge up the types since *EVERY* linux architecture  
has these same types:

typedef   signed char      __s8;
typedef unsigned char      __u8;
typedef   signed short     __s16;
typedef unsigned short     __u16;
typedef   signed int       __s32;
typedef unsigned int       __u32;

Then all 64-bit archs have:
typedef   signed long      __s64;
typedef unsigned long      __u64;

While all 32-bit archs have:
typedef   signed long long __s64;
typedef unsigned long long __u64;

The only trick is if you care about building 32-bit compat code using  
64-bit linux kernel headers.  In that case we should probably just  
make all archs use "long long" for their 64-bit integers, unless  
there's some platform I'm not remembering where "long long" is 128- 
bits or bigger.  The other benefit is that people could then just use  
the printf format "%llu" for 64-bit integers instead of having to  
conditionalize it all over the place.

I'm working on a patch now.

Cheers,
Kyle Moffett

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/