bne %ft0,这个指令中的t是做什么用的呢?和解。

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 楼主| luocolor 发表于 2007-1-15 21:10 | 显示全部楼层 |阅读模式
John_light 发表于 2007-1-15 23:10 | 显示全部楼层

又貼一次

<u>Local&nbsp;labels</u><br /><br />A&nbsp;local&nbsp;label&nbsp;is&nbsp;a&nbsp;number&nbsp;in&nbsp;the&nbsp;range&nbsp;0-99,&nbsp;optionally&nbsp;followed&nbsp;by&nbsp;a&nbsp;name.&nbsp;The&nbsp;same&nbsp;number&nbsp;can&nbsp;be&nbsp;used&nbsp;for&nbsp;more&nbsp;than&nbsp;one&nbsp;local&nbsp;label&nbsp;in&nbsp;an&nbsp;ELF&nbsp;section.<br /><br />Local&nbsp;labels&nbsp;are&nbsp;typically&nbsp;used&nbsp;for&nbsp;loops&nbsp;and&nbsp;conditional&nbsp;code&nbsp;within&nbsp;a&nbsp;routine,&nbsp;or&nbsp;for&nbsp;small&nbsp;subroutines&nbsp;that&nbsp;are&nbsp;only&nbsp;used&nbsp;locally.&nbsp;They&nbsp;are&nbsp;particularly&nbsp;useful&nbsp;in&nbsp;macros.<br /><br />You&nbsp;can&nbsp;use&nbsp;the&nbsp;same&nbsp;number&nbsp;for&nbsp;more&nbsp;than&nbsp;one&nbsp;local&nbsp;label&nbsp;even&nbsp;within&nbsp;the&nbsp;same&nbsp;scope.<br /><br />By&nbsp;default,&nbsp;the&nbsp;assembler&nbsp;links&nbsp;a&nbsp;local&nbsp;label&nbsp;reference&nbsp;to:<br />.&nbsp;the&nbsp;most&nbsp;recent&nbsp;local&nbsp;label&nbsp;of&nbsp;the&nbsp;same&nbsp;number,&nbsp;if&nbsp;there&nbsp;is&nbsp;one&nbsp;within&nbsp;the&nbsp;scope<br />.&nbsp;the&nbsp;next&nbsp;following&nbsp;local&nbsp;label&nbsp;of&nbsp;the&nbsp;same&nbsp;number,&nbsp;if&nbsp;there&nbsp;is&nbsp;not&nbsp;a&nbsp;preceding&nbsp;one&nbsp;within&nbsp;the&nbsp;scope.<br /><br />Use&nbsp;the&nbsp;optional&nbsp;parameters&nbsp;to&nbsp;modify&nbsp;this&nbsp;search&nbsp;pattern&nbsp;if&nbsp;required.<br /><br /><b>Syntax</b><br /><br />The&nbsp;syntax&nbsp;of&nbsp;a&nbsp;<u>local&nbsp;label</u>&nbsp;is:<br /><i>n{routname}</i><br />The&nbsp;syntax&nbsp;of&nbsp;a&nbsp;<u>reference&nbsp;to&nbsp;a&nbsp;local&nbsp;label</u>&nbsp;is:<br /><i>%{F|B}{A|T}n{routname}</i><br /><br />where:<br /><br />n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;is&nbsp;the&nbsp;<u>number</u>&nbsp;of&nbsp;the&nbsp;local&nbsp;label.<br />routname&nbsp;is&nbsp;the&nbsp;<u>name</u>&nbsp;of&nbsp;the&nbsp;current&nbsp;scope.<br />%&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;introduces&nbsp;the&nbsp;reference.<br />F&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instructs&nbsp;the&nbsp;assembler&nbsp;to&nbsp;search&nbsp;<u>forwards</u>&nbsp;only.<br />B&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instructs&nbsp;the&nbsp;assembler&nbsp;to&nbsp;search&nbsp;<u>backwards</u>&nbsp;only.<br />A&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instructs&nbsp;the&nbsp;assembler&nbsp;to&nbsp;search&nbsp;<u>all</u>&nbsp;macro&nbsp;levels.<br />T&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instructs&nbsp;the&nbsp;assembler&nbsp;to&nbsp;look&nbsp;at&nbsp;<u>this</u>&nbsp;macro&nbsp;level&nbsp;only.<br /><br />If&nbsp;neither&nbsp;F&nbsp;or&nbsp;B&nbsp;is&nbsp;specified,&nbsp;the&nbsp;assembler&nbsp;searches&nbsp;backwards&nbsp;first,&nbsp;then&nbsp;forwards.<br />If&nbsp;neither&nbsp;A&nbsp;or&nbsp;T&nbsp;is&nbsp;specified,&nbsp;the&nbsp;assembler&nbsp;searches&nbsp;all&nbsp;macros&nbsp;from&nbsp;the&nbsp;current&nbsp;level&nbsp;to&nbsp;the&nbsp;top&nbsp;level,&nbsp;but&nbsp;does&nbsp;not&nbsp;search&nbsp;lower&nbsp;level&nbsp;macros.
 楼主| luocolor 发表于 2007-1-16 22:30 | 显示全部楼层

多谢John_light

多谢了。<br />还有个问题,这个资料是在哪里找的呢?
John_light 发表于 2007-1-16 23:25 | 显示全部楼层

ARM Architecture Reference Manual

搞ARM,这书可不能缺。
平常人 发表于 2007-1-16 23:28 | 显示全部楼层

倒塌了。。。 http://www.arm.com

  
John_light 发表于 2007-1-17 09:02 | 显示全部楼层

以為是熱力hotpower,原來是平常人,哈哈

其實ADS&nbsp;Assembler&nbsp;Guide或者RealView&nbsp;Compilation&nbsp;Tools&nbsp;Assembler&nbsp;Guide都有相關說明,不過我比較愛翻那本書而已。
 楼主| luocolor 发表于 2007-1-17 23:53 | 显示全部楼层

呵呵

怪我懒了,不应该啊!<br />在ads安装后,pdf里面就有这个的。就是没有仔细去研究研究它。
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