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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> | ||