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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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574 lines
36 KiB
HTML
574 lines
36 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. EVERYTHING is built from source. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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</head>
|
||
<body id="atomic-c" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="atomic-c"><a class="anchor" href="#atomic-c"></a><a class="link" href="#atomic-c">27.2.2.1. atomic.c</a></h5>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/atomic.c">userland/c/atomic.c</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/atomic/">userland/c/atomic/</a>: files in this directory use the same technique as <a href="atomic-cpp.html">atomic.cpp</a>, i.e. with one special case per file.</p>
|
||
<div class="paragraph">
|
||
<p>Maybe <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/atomic.c">userland/c/atomic.c</a> should be deprecated in favor of those more minimal ones.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This was added because C++-pre main is too bloated, especially when we turn one a gazillion <a href="gem5.html">gem5</a> logs, it makes me want to cry.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>And we want a single operation per test rather than to as in <code>atomic.c</code> because when using gem5 we want absolute control over the microbenchmark.</p>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Demonstrates <code>atomic_int</code> and <code>thrd_create</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p><a href="disas.html">Disassembly with GDB</a> at LKMC 619fef4b04bddc4a5a38aec5e207dd4d5a25d206 + 1:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./disas --arch aarch64 --userland userland/c/atomic.c my_thread_main</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>shows on ARM:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>16 ++cnt;
|
||
0x00000000004008cc <+28>: 80 00 00 b0 adrp x0, 0x411000 <malloc@got.plt>
|
||
0x00000000004008d0 <+32>: 00 80 01 91 add x0, x0, #0x60
|
||
0x00000000004008d4 <+36>: 00 00 40 b9 ldr w0, [x0]
|
||
0x00000000004008d8 <+40>: 01 04 00 11 add w1, w0, #0x1
|
||
0x00000000004008dc <+44>: 80 00 00 b0 adrp x0, 0x411000 <malloc@got.plt>
|
||
0x00000000004008e0 <+48>: 00 80 01 91 add x0, x0, #0x60
|
||
0x00000000004008e4 <+52>: 01 00 00 b9 str w1, [x0]
|
||
|
||
17 ++acnt;
|
||
0x00000000004008e8 <+56>: 20 00 80 52 mov w0, #0x1 // #1
|
||
0x00000000004008ec <+60>: e0 1b 00 b9 str w0, [sp, #24]
|
||
0x00000000004008f0 <+64>: e0 1b 40 b9 ldr w0, [sp, #24]
|
||
0x00000000004008f4 <+68>: e2 03 00 2a mov w2, w0
|
||
0x00000000004008f8 <+72>: 80 00 00 b0 adrp x0, 0x411000 <malloc@got.plt>
|
||
0x00000000004008fc <+76>: 00 70 01 91 add x0, x0, #0x5c
|
||
0x0000000000400900 <+80>: 03 00 e2 b8 ldaddal w2, w3, [x0]
|
||
0x0000000000400904 <+84>: 61 00 02 0b add w1, w3, w2
|
||
0x0000000000400908 <+88>: e0 03 01 2a mov w0, w1
|
||
0x000000000040090c <+92>: e0 1f 00 b9 str w0, [sp, #28]</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>so:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>the atomic increment uses <a href="arm-lse.html"><code>ldadd</code></a></p>
|
||
</li>
|
||
<li>
|
||
<p>the non-atomic increment just does LDR, ADD, STR: <a href="arm-lse.html"><code>ldadd</code></a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>With <code>-O3</code>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>16 ++cnt;
|
||
0x0000000000400a00 <+32>: 60 00 40 b9 ldr w0, [x3]
|
||
0x0000000000400a04 <+36>: 00 04 00 11 add w0, w0, #0x1
|
||
0x0000000000400a08 <+40>: 60 00 00 b9 str w0, [x3]
|
||
|
||
17 ++acnt;
|
||
0x0000000000400a0c <+44>: 20 00 80 52 mov w0, #0x1 // #1
|
||
0x0000000000400a10 <+48>: 40 00 e0 b8 ldaddal w0, w0, [x2]</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>so the situation is the same but without all the horrible stack noise.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
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|
||
<div class="paragraph nav-footer">
|
||
<p>↑ Up: <a href="c-multithreading.html">C multithreading</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gcc-c-extensions.html">GCC C extensions</a> →</p>
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