From: Heiko Carstens <heiko.carstens@de•ibm.com>
To: Martin Schwidefsky <schwidefsky@de•ibm.com>
Cc: Eric Paris <eparis@redhat•com>, Sachin Sant <sachinp@in•ibm.com>,
linux-s390@vger•kernel.org,
Stephen Rothwell <sfr@canb•auug.org.au>,
linux-next@vger•kernel.org,
Andrew Morton <akpm@linux-foundation•org>,
linux-arch@vger•kernel.org
Subject: Re: [-next Nov 17] s390 build break(arch/s390/kernel/compat_wrapper.S)
Date: Wed, 18 Nov 2009 19:41:56 +0100 [thread overview]
Message-ID: <20091118184156.GB3973@osiris.boeblingen.de.ibm.com> (raw)
In-Reply-To: <20091118183400.0cd6b177@mschwide.boeblingen.de.ibm.com>
On Wed, Nov 18, 2009 at 06:34:00PM +0100, Martin Schwidefsky wrote:
> used for parameter passing. 64 bit values are passed as registers pairs
> with the first register an even numbered register. The effect of that
> rule is that parameter registers may be skipped or that the whole 64 bit
> value is passed on the stack. Examples:
Erm, did I miss something? The 32 bit ABI doesn't say anything about
even/odd register pairs for 64 bit values. Also gcc doesn't generate
such code:
> fn(int a, long long b, int c)
> a is passed in %r2, b is passed in %r4/%r5, c is passed in %r6, %r3 is
> skipped.
extern void fn(int a, long long b, int c);
void bla(void)
{
fn(0, 1, 2);
}
00000000 <bla>:
0: 90 ef f0 38 stm %r14,%r15,56(%r15)
4: a7 fa ff a0 ahi %r15,-96
8: a7 28 00 00 lhi %r2,0
c: a7 38 00 00 lhi %r3,0
10: a7 48 00 01 lhi %r4,1
14: a7 58 00 02 lhi %r5,2
18: c0 e5 00 00 00 00 brasl %r14,18 <bla+0x18>
1e: 98 ef f0 98 lm %r14,%r15,152(%r15)
22: 07 fe br %r14
Not that it really matters, since other archs enforce the rule anyway.
next prev parent reply other threads:[~2009-11-18 18:42 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-17 8:53 linux-next: Tree for November 17 Stephen Rothwell
2009-11-17 12:06 ` [-next Nov 17] s390 build break(arch/s390/kernel/compat_wrapper.S) Sachin Sant
2009-11-17 12:52 ` Heiko Carstens
2009-11-17 13:40 ` Eric Paris
2009-11-17 13:55 ` Heiko Carstens
2009-11-17 15:23 ` Eric Paris
2009-11-17 15:50 ` Heiko Carstens
2009-11-17 15:57 ` Eric Paris
2009-11-17 16:14 ` Heiko Carstens
2009-11-18 7:04 ` Heiko Carstens
2009-11-18 9:27 ` Russell King
2009-11-18 14:49 ` Ralf Baechle
2009-11-18 16:02 ` Eric Paris
2009-11-18 16:22 ` Heiko Carstens
2009-11-18 17:34 ` Martin Schwidefsky
2009-11-18 18:41 ` Heiko Carstens [this message]
2009-11-19 8:54 ` Martin Schwidefsky
2009-11-18 17:24 ` Eric Paris
2009-11-17 17:02 ` linux-next: Tree for November 17 (exofs) Randy Dunlap
2009-11-17 17:08 ` Boaz Harrosh
2009-11-17 17:10 ` Boaz Harrosh
2009-11-17 17:24 ` Boaz Harrosh
2009-11-17 17:48 ` Randy Dunlap
2009-11-17 18:17 ` [PATCH -next] sep: fix 2 warnings Randy Dunlap
2009-11-17 18:29 ` Alan Cox
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