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diff --git a/tools/qemu.html b/tools/qemu.html index daf3e1a..b53cb23 100644 --- a/tools/qemu.html +++ b/tools/qemu.html @@ -353,6 +353,34 @@ 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>&1 | awk '/RIP/ { print $$1; }' + +clean: + $(RM) test test-bin test.o +</code></pre> +<pre><code class="language-x86asm">.section .text, "ax" + +.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> |