📄 balign.html

📁 gcc手册
💻 HTML
字号:
<html lang="en">

<head>

<title>Using as</title>

<meta http-equiv="Content-Type" content="text/html">

<meta name="description" content="Using as">

<meta name="generator" content="makeinfo 4.3">

<link href="http://www.gnu.org/software/texinfo/" rel="generator-home">

</head>

<body>

<div class="node">

<p>

Node:<a name="Balign">Balign</a>,

Next:<a rel="next" accesskey="n" href="Byte.html#Byte">Byte</a>,

Previous:<a rel="previous" accesskey="p" href="Asciz.html#Asciz">Asciz</a>,

Up:<a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo%20Ops">Pseudo Ops</a>

<hr><br>

</div>



<h3 class="section"><code>.balign[wl] </code><var>abs-expr</var><code>, </code><var>abs-expr</var><code>, </code><var>abs-expr</var><code></code></h3>



   <p>Pad the location counter (in the current subsection) to a particular

storage boundary.  The first expression (which must be absolute) is the

alignment request in bytes.  For example <code>.balign 8</code> advances

the location counter until it is a multiple of 8.  If the location counter

is already a multiple of 8, no change is needed.



   <p>The second expression (also absolute) gives the fill value to be stored in the

padding bytes.  It (and the comma) may be omitted.  If it is omitted, the

padding bytes are normally zero.  However, on some systems, if the section is

marked as containing code and the fill value is omitted, the space is filled

with no-op instructions.



   <p>The third expression is also absolute, and is also optional.  If it is present,

it is the maximum number of bytes that should be skipped by this alignment

directive.  If doing the alignment would require skipping more bytes than the

specified maximum, then the alignment is not done at all.  You can omit the

fill value (the second argument) entirely by simply using two commas after the

required alignment; this can be useful if you want the alignment to be filled

with no-op instructions when appropriate.



   <p>The <code>.balignw</code> and <code>.balignl</code> directives are variants of the

<code>.balign</code> directive.  The <code>.balignw</code> directive treats the fill

pattern as a two byte word value.  The <code>.balignl</code> directives treats the

fill pattern as a four byte longword value.  For example, <code>.balignw

4,0x368d</code> will align to a multiple of 4.  If it skips two bytes, they will be

filled in with the value 0x368d (the exact placement of the bytes depends upon

the endianness of the processor).  If it skips 1 or 3 bytes, the fill value is

undefined.



   </body></html>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -