From: Valentine <vbarshak@ru•mvista.com>
To: Wolfgang Denk <wd@denx•de>
Cc: HongWoo Lee <hongwoo7@gmail•com>, linuxppc-dev@lists•ozlabs.org
Subject: Re: Simple question about powerpc asm.
Date: Sat, 18 Jul 2009 17:55:35 +0400 [thread overview]
Message-ID: <4A61D457.2030105@ru.mvista.com> (raw)
In-Reply-To: <20090718125452.3760D832E416@gemini.denx.de>
Wolfgang Denk wrote:
> Dear Valentine,
>
> In message <4A61A48D.8060601@ru•mvista.com> you wrote:
>> PowerPC instructions are 32-bit long. So, there are only 16 bits
>> available within the instruction for constant values. Since address can
>> be up to 64 bits, we have to load it a piece at a time. The "@" within
>> the assembler instruct it to give a specially-processed form of a symbol
>> value:
>>
>> @highest -- refers to bits 48-63 of a constant
>> @higher -- refers to bits 32-47 of a constant
>> @h -- refers to bits 16-31 of a constant
>> @l -- refers to bits 0-15 of a constant
>
> Actually these bit numbers are wrong, as bit 0 is the MSB for PowerPC
> ;-)
All right, you got me ;)
Even copy-pasting from the IBM docs, one has to double-check :)
Regards,
Val.
>
> Best regards,
>
> Wolfgang Denk
>
prev parent reply other threads:[~2009-07-18 13:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-18 9:24 Simple question about powerpc asm HongWoo Lee
2009-07-18 10:31 ` Valentine
2009-07-18 12:54 ` Wolfgang Denk
2009-07-18 13:55 ` Valentine [this message]
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