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1 | <html> | ||
2 | <head> | ||
3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
4 | <title>3.3. x32</title> | ||
5 | <link rel="stylesheet" type="text/css" href="../book.css"> | ||
6 | <meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> | ||
7 | <link rel="home" href="index.html" title="The Yocto Project Reference Manual"> | ||
8 | <link rel="up" href="technical-details.html" title="Chapter 3. Technical Details"> | ||
9 | <link rel="prev" href="invalidating-shared-state.html" title="3.2.4.2. Invalidating Shared State"> | ||
10 | <link rel="next" href="support.html" title="3.3.1. Support"> | ||
11 | </head> | ||
12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="3.3. x32"> | ||
13 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | ||
14 | <a name="x32"></a>3.3. x32</h2></div></div></div> | ||
15 | <p> | ||
16 | x32 is a new processor-specific Application Binary Interface (psABI) for x86_64. | ||
17 | An ABI defines the calling conventions between functions in a processing environment. | ||
18 | The interface determines what registers are used and what the sizes are for various C data types. | ||
19 | </p> | ||
20 | <p> | ||
21 | Some processing environments prefer using 32-bit applications even when running | ||
22 | on Intel 64-bit platforms. | ||
23 | Consider the i386 psABI, which is a very old 32-bit ABI for Intel 64-bit platforms. | ||
24 | The i386 psABI does not provide efficient use and access of the Intel 64-bit processor resources, | ||
25 | leaving the system underutilized. | ||
26 | Now consider the x86_64 psABI. | ||
27 | This ABI is newer and uses 64-bits for data sizes and program pointers. | ||
28 | The extra bits increase the footprint size of the programs, libraries, | ||
29 | and also increases the memory and file system size requirements. | ||
30 | Executing under the x32 psABI enables user programs to utilize CPU and system resources | ||
31 | more efficiently while keeping the memory footprint of the applications low. | ||
32 | Extra bits are used for registers but not for addressing mechanisms. | ||
33 | </p> | ||
34 | </div></body> | ||
35 | </html> | ||