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authorjohannst <johannst@users.noreply.github.com>2023-02-05 17:35:44 +0000
committerjohannst <johannst@users.noreply.github.com>2023-02-05 17:35:44 +0000
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@@ -2092,6 +2092,34 @@ launched with the <strong>same</strong> parameters.</p>
...
</code></pre>
<p>Instructions to build a minimal <a href="https://blog.memzero.de/kernel-debugging-qemu"><code>Kernel</code> and <code>initrd</code></a>.</p>
+<h2 id="appendix-cheap-instruction-tracer"><a class="header" href="#appendix-cheap-instruction-tracer">Appendix: Cheap instruction tracer</a></h2>
+<pre><code class="language-make">test: test.s
+ as -o test.o test.s
+ ld -o test test.o testc.o
+
+trace: test
+ qemu-x86_64 -singlestep -d nochain,cpu ./test 2&gt;&amp;1 | awk '/RIP/ { print $$1; }'
+
+clean:
+ $(RM) test test-bin test.o
+</code></pre>
+<pre><code class="language-x86asm">.section .text, &quot;ax&quot;
+
+.global _start
+_start:
+ xor %rax, %rax
+ mov $0x8, %rax
+1:
+ cmp $0, %rax
+ je 2f
+ dec %rax
+ jmp 1b
+2:
+ # x86-64 exit(2) syscall
+ mov $0, %rdi
+ mov $60, %rax
+ syscall
+</code></pre>
<h2 id="references"><a class="header" href="#references">References</a></h2>
<ul>
<li><a href="https://github.com/qemu/qemu/blob/master/docs/usb2.txt">QEMU USB</a></li>