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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> | ||
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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> | ||