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| 1 | <html> | ||
| 2 | <head> | ||
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
| 4 | <title>3.8. x32 psABI</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="Getting Started With Yocto Project"> | ||
| 8 | <link rel="up" href="overview-concepts.html" title="Chapter 3. Yocto Project Concepts"> | ||
| 9 | <link rel="prev" href="other-variables-related-to-commercial-licenses.html" title="3.7.2.2. Other Variables Related to Commercial Licenses"> | ||
| 10 | </head> | ||
| 11 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="3.8. x32 psABI"> | ||
| 12 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | ||
| 13 | <a name="x32"></a>3.8. x32 psABI</h2></div></div></div> | ||
| 14 | <p> | ||
| 15 | x32 processor-specific Application Binary Interface | ||
| 16 | (<a class="ulink" href="https://software.intel.com/en-us/node/628948" target="_self">x32 psABI</a>) | ||
| 17 | is a native 32-bit processor-specific ABI for | ||
| 18 | <span class="trademark">Intel</span>® 64 (x86-64) | ||
| 19 | architectures. | ||
| 20 | An ABI defines the calling conventions between functions in a | ||
| 21 | processing environment. | ||
| 22 | The interface determines what registers are used and what the sizes are | ||
| 23 | for various C data types. | ||
| 24 | </p> | ||
| 25 | <p> | ||
| 26 | Some processing environments prefer using 32-bit applications even | ||
| 27 | when running on Intel 64-bit platforms. | ||
| 28 | Consider the i386 psABI, which is a very old 32-bit ABI for Intel | ||
| 29 | 64-bit platforms. | ||
| 30 | The i386 psABI does not provide efficient use and access of the | ||
| 31 | Intel 64-bit processor resources, leaving the system underutilized. | ||
| 32 | Now consider the x86_64 psABI. | ||
| 33 | This ABI is newer and uses 64-bits for data sizes and program | ||
| 34 | pointers. | ||
| 35 | The extra bits increase the footprint size of the programs, | ||
| 36 | libraries, and also increases the memory and file system size | ||
| 37 | requirements. | ||
| 38 | Executing under the x32 psABI enables user programs to utilize CPU | ||
| 39 | and system resources more efficiently while keeping the memory | ||
| 40 | footprint of the applications low. | ||
| 41 | Extra bits are used for registers but not for addressing mechanisms. | ||
| 42 | </p> | ||
| 43 | <p> | ||
| 44 | The Yocto Project supports the final specifications of x32 psABI | ||
| 45 | as follows: | ||
| 46 | </p> | ||
| 47 | <div class="itemizedlist"><ul class="itemizedlist" type="disc"> | ||
| 48 | <li class="listitem"><p> | ||
| 49 | You can create packages and images in x32 psABI format on | ||
| 50 | x86_64 architecture targets. | ||
| 51 | </p></li> | ||
| 52 | <li class="listitem"><p> | ||
| 53 | You can successfully build recipes with the x32 toolchain. | ||
| 54 | </p></li> | ||
| 55 | <li class="listitem"><p> | ||
| 56 | You can create and boot | ||
| 57 | <code class="filename">core-image-minimal</code> and | ||
| 58 | <code class="filename">core-image-sato</code> images. | ||
| 59 | </p></li> | ||
| 60 | <li class="listitem"><p> | ||
| 61 | RPM Package Manager (RPM) support exists for x32 binaries. | ||
| 62 | </p></li> | ||
| 63 | <li class="listitem"><p> | ||
| 64 | Support for large images exists. | ||
| 65 | </p></li> | ||
| 66 | </ul></div> | ||
| 67 | <p> | ||
| 68 | </p> | ||
| 69 | <p> | ||
| 70 | For steps on how to use x32 psABI, see the | ||
| 71 | "<a class="link" href="../dev-manual/using-x32-psabi.html" target="_self">Using x32 psABI</a>" | ||
| 72 | section in the Yocto Project Development Tasks Manual. | ||
| 73 | </p> | ||
| 74 | </div></body> | ||
| 75 | </html> | ||