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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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553 lines
36 KiB
HTML
553 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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|
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}
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</style>
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<style>.toc-current{font-weight: bold;} .toc-root{font-family: "Open Sans","DejaVu Sans",sans-serif;
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font-size: 0.9em;} #content{display: flex; flex-direction: column; flex: 1 1 auto;}
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.nav-footer > p > a {white-space: nowrap;}</style>
|
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</head>
|
||
<body id="gem5-se-py-page-translation" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect5">
|
||
<h6 id="gem5-se-py-page-translation"><a class="anchor" href="#gem5-se-py-page-translation"></a><a class="link" href="#gem5-se-py-page-translation">24.22.4.1.4. gem5 se.py page translation</a></h6>
|
||
<div class="paragraph">
|
||
<p>Happens on <code>EmulationPageTable</code>, and seems to happen atomically without making any extra memory requests.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO confirm from code, notably by seeing where the translation table is set.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>But we can confirm with logging with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>--trace DRAM,ExecAll,FmtFlag</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which gives</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> 0: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x78
|
||
0: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue : movz x0, #1, #0 : IntAlu : D=0x0000000000000001 flags=(IsInteger)
|
||
500: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x7c
|
||
500: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+4 : adr x1, #28 : IntAlu : D=0x0000000000400098 flags=(IsInteger)
|
||
1000: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x80
|
||
1000: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0xa0
|
||
1000: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+8 : ldr w2, #4194464 : MemRead : D=0x0000000000000006 A=0x4000a0 flags=(IsInteger|IsMemRef|IsLoad)
|
||
1500: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x84
|
||
1500: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+12 : movz x8, #64, #0 : IntAlu : D=0x0000000000000040 flags=(IsInteger)
|
||
2000: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x88
|
||
2000: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+16 : svc #0x0 : IntAlu : flags=(IsSerializeAfter|IsNonSpeculative|IsSyscall)
|
||
hello
|
||
2500: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x8c
|
||
2500: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+20 : movz x0, #0, #0 : IntAlu : D=0x0000000000000000 flags=(IsInteger)
|
||
3000: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x90
|
||
3000: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+24 : movz x8, #93, #0 : IntAlu : D=0x000000000000005d flags=(IsInteger)
|
||
3500: DRAM: system.mem_ctrls: recvAtomic: ReadReq 0x94
|
||
3500: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+28 : svc #0x0 : IntAlu : flags=(IsSerializeAfter|IsNonSpeculative|IsSyscall)
|
||
Exiting @ tick 3500 because exiting with last active thread context
|
||
3500: DRAM: system.mem_ctrls_0: Computing stats due to a dump callback
|
||
3500: DRAM: system.mem_ctrls_1: Computing stats due to a dump callback</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So we see that before every instruction execution there was a DRAM event! Also, each read happens 4 bytes after the previous one, which is consistent with instruction fetches.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The DRAM addresses are very close to zero e.g. <code>0x78</code> for the first instruction, and therefore we guess that they are physical since the ELF entry point is much higher:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run-toolchain --arch aarch64 readelf -- -h "$(./getvar --arch aarch64 userland_build_dir)/arch/aarch64/freestanding/linux/hello.out</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>at:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> Entry point address: 0x400078</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For LDR, we see that there was an extra DRAM read as well after the fetch read, as expected.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Tested in gem5 b4879ae5b0b6644e6836b0881e4da05c64a6550d.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="atomicsimplecpu-memory-access.html">AtomicSimpleCPU memory access</a> | ↑ Up: <a href="gem5-event-queue-atomicsimplecpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue AtomicSimpleCPU syscall emulation freestanding example analysis</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-event-queue-timingsimplecpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue TimingSimpleCPU syscall emulation freestanding example analysis</a> →</p>
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