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Re: [patch] Handle return small struct in rs600 (size is not 4/8)

From: Yao Qi <yao at codesourcery dot com>
To: Andreas Schwab <schwab at linux-m68k dot org>
Cc: Mark Kettenis <mark dot kettenis at xs4all dot nl>, gdb-patches at sourceware dot org
Date: Tue, 16 Aug 2011 09:41:05 +0800
Subject: Re: [patch] Handle return small struct in rs600 (size is not 4/8)
References: <4E4939A9.70000@codesourcery.com> <201108151605.p7FG5F1Z004428@glazunov.sibelius.xs4all.nl> <4E494FA9.9000402@codesourcery.com> <m239h2jyk2.fsf@igel.home>

On 08/16/2011 02:54 AM, Andreas Schwab wrote:
> Yao Qi <yao@codesourcery.com> writes:
> 
>> I think the description "shall be returned in r3 and r4, as if they were
>> first stored in memory area and then the low-addressed word were loaded
>> in r3 ...." is not very clear on the length of data.  In this case,
>> struct C variable is returned, and its content is 0x61 0x62 0x63.  They
>> (3 bytes) are stored in memory, and (3 bytes) are loaded into r3.  Since
>> 3 bytes, not 4, are loaded to r3
> 
> When you load a (32-bit) register from memory, you always read 4 bytes.
> 

Andreas, thanks for your clarification.  Please ignore my patch, and
sorry for the noise.

-- 
Yao (éå)

References:
- [patch] Handle return small struct in rs600 (size is not 4/8)
  - From: Yao Qi
- Re: [patch] Handle return small struct in rs600 (size is not 4/8)
  - From: Mark Kettenis
- Re: [patch] Handle return small struct in rs600 (size is not 4/8)
  - From: Yao Qi
- Re: [patch] Handle return small struct in rs600 (size is not 4/8)
  - From: Andreas Schwab

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