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blog_os/blog/templates/first-edition/comments/remap-the-kernel.html
Philipp Oppermann 304eb179f1 Use rel="nofollow" for all old comments
2019-07-07 10:36:16 +02:00

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<div id="isso-root"><div id="isso-180" class="isso-comment isso-no-votes"><div class="avatar"><svg version="1.1" viewBox="0 0 48 48" preserveAspectRatio="xMinYMin meet" shape-rendering="crispEdges" data-hash="666df3217240"><rect x="0" y="0" width="56" height="56" style="fill: #f0f0f0"></rect><rect x="4" y="12" width="8" height="8" style="fill: #9abf88"></rect><rect x="36" y="12" width="8" height="8" style="fill: #9abf88"></rect><rect x="4" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="36" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="4" y="36" width="8" height="8" style="fill: #9abf88"></rect><rect x="36" y="36" width="8" height="8" style="fill: #9abf88"></rect><rect x="12" y="4" width="8" height="8" style="fill: #9abf88"></rect><rect x="28" y="4" width="8" height="8" style="fill: #9abf88"></rect><rect x="12" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="28" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="20" y="12" width="8" height="8" style="fill: #9abf88"></rect></svg></div><div class="text-wrapper"><div role="meta" class="isso-comment-header"><span class="author">Philipp Oppermann</span><span class="spacer">•</span><a rel="nofollow" href="#isso-180" class="permalink"><time title="Sat Jan 02 2016 15:56:41 GMT+0100 (Central European Standard Time)" datetime="2016-00-06T14:56:41Z">vor 3 Jahren</time></a><span class="note"></span></div><div class="text"><p>There is some discussion on <a rel="nofollow" href="https://news.ycombinator.com/item?id=10822479">hacker news</a>, <a rel="nofollow" href="https://www.reddit.com/r/rust/comments/3z1b9b/writing_an_os_in_rust_remap_the_kernel/">/r/rust</a>, and <a rel="nofollow" href="https://www.reddit.com/r/programming/comments/3z1mcz/writing_an_os_in_rust_remap_the_kernel/">/r/programming</a>.</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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</a><a rel="nofollow" href="#" class="reply">Antworten</a></div><div class="isso-follow-up"></div></div></div><div id="isso-181" class="isso-comment isso-no-votes"><div class="avatar"><svg version="1.1" viewBox="0 0 48 48" preserveAspectRatio="xMinYMin meet" shape-rendering="crispEdges" data-hash="250647bcaa0e"><rect x="0" y="0" width="56" height="56" style="fill: #f0f0f0"></rect><rect x="4" y="20" width="8" height="8" style="fill: #e4bf80"></rect><rect x="36" y="20" width="8" height="8" style="fill: #e4bf80"></rect><rect x="4" y="36" width="8" height="8" style="fill: #e4bf80"></rect><rect x="36" y="36" width="8" height="8" style="fill: #e4bf80"></rect><rect x="12" y="12" width="8" height="8" style="fill: #e4bf80"></rect><rect x="28" y="12" width="8" height="8" style="fill: #e4bf80"></rect><rect x="12" y="28" width="8" height="8" style="fill: #e4bf80"></rect><rect x="28" y="28" width="8" height="8" style="fill: #e4bf80"></rect><rect x="20" y="36" width="8" height="8" style="fill: #e4bf80"></rect></svg></div><div class="text-wrapper"><div role="meta" class="isso-comment-header"><span class="author">Rajivteja Nagipogu</span><span class="spacer">•</span><a rel="nofollow" href="#isso-181" class="permalink"><time title="Tue Mar 28 2017 13:59:23 GMT+0200 (Central European Summer Time)" datetime="2017-02-02T11:59:23Z">vor 2 Jahren</time></a><span class="note"></span></div><div class="text"><p>Error while using x86_64::shared::control_regs. <br>There was no `shared` in x86_64. <br>Thanks for the help. :) </p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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<p>A bit of sleuthing on my part deduced the issue, I'm getting a double fault when I try to write to the cr3 register. A bit more debugging helped me find the culprit, when I write to cr3 in the switch method, something happens and the CPU double faults.</p>
<p>The exact instruction that the pc points to in the register dump is "add $0x18, %rsp"</p>
<p>Thanks in advance for helping me resolve this.</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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</a><a rel="nofollow" href="#" class="reply">Antworten</a></div><div class="isso-follow-up"><div id="isso-304" class="isso-comment isso-no-votes"><div class="avatar"><svg version="1.1" viewBox="0 0 48 48" preserveAspectRatio="xMinYMin meet" shape-rendering="crispEdges" data-hash="815d89e67774"><rect x="0" y="0" width="56" height="56" style="fill: #f0f0f0"></rect><rect x="4" y="4" width="8" height="8" style="fill: #be5168"></rect><rect x="36" y="4" width="8" height="8" style="fill: #be5168"></rect><rect x="4" y="28" width="8" height="8" style="fill: #be5168"></rect><rect x="36" y="28" width="8" height="8" style="fill: #be5168"></rect><rect x="4" y="36" width="8" height="8" style="fill: #be5168"></rect><rect x="36" y="36" width="8" height="8" style="fill: #be5168"></rect><rect x="12" y="4" width="8" height="8" style="fill: #be5168"></rect><rect x="28" y="4" width="8" height="8" style="fill: #be5168"></rect><rect x="12" y="20" width="8" height="8" style="fill: #be5168"></rect><rect x="28" y="20" width="8" height="8" style="fill: #be5168"></rect><rect x="12" y="28" width="8" height="8" style="fill: #be5168"></rect><rect x="28" y="28" width="8" height="8" style="fill: #be5168"></rect><rect x="12" y="36" width="8" height="8" style="fill: #be5168"></rect><rect x="28" y="36" width="8" height="8" style="fill: #be5168"></rect><rect x="20" y="12" width="8" height="8" style="fill: #be5168"></rect><rect x="20" y="20" width="8" height="8" style="fill: #be5168"></rect><rect x="20" y="28" width="8" height="8" style="fill: #be5168"></rect></svg></div><div class="text-wrapper"><div role="meta" class="isso-comment-header"><span class="author">Rhys Kenwell</span><span class="spacer">•</span><a rel="nofollow" href="#isso-304" class="permalink"><time title="Fri Jul 07 2017 19:51:27 GMT+0200 (Central European Summer Time)" datetime="2017-06-05T17:51:27Z">letztes Jahr</time></a><span class="note"></span></div><div class="text"><p>Looked a bit further, the original fault is a page fault with the present, write, and reserved write bits set</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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<ul>
<li>a wrong register (should be <code>IA32_EFER</code>)</li>
<li>a wrong bit number (should be <code>1 &lt;&lt; 11</code>)</li>
<li>your CPU somehow doesn't support it (if you run it on real hardware)
<ul>
<li>does in work in QEMU?</li>
<li>The AMD manual says: “Before setting this bit, system software must verify the processor supports the NX feature by checking the CPUID NX feature flag (CPUID Fn8000_0001_EDX[NX]).”</li>
</ul></li>
</ul>
<p>Hope this helps!</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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I had the same problem and discovered that it was actually a typo, I didn't notice the ! on the <code>if</code> checking for ELF_SECTION_EXECUTABLE in <code>EntryFlags::from_elf_section_flags</code>. Maybe this will shed some light on your problem, if you still have it.</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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