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570 lines
35 KiB
HTML
570 lines
35 KiB
HTML
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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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.nav-footer > p > a {white-space: nowrap;}</style>
|
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</head>
|
||
<body id="gem5-process" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="gem5-process"><a class="anchor" href="#gem5-process"></a><a class="link" href="#gem5-process">24.22.6.4. gem5 <code>Process</code></a></h5>
|
||
<div class="paragraph">
|
||
<p>The <code>Process</code> class is used only for <a href="gem5-syscall-emulation-mode.html">gem5 syscall emulation mode</a>, and it represents a process like a Linux userland process, in addition to any further gem5 specific data needed to represent the process.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The first thing most syscall implementations do is to actually pull <code>Process</code> out of <a href="gem5-threadcontext.html">gem5 <code>ThreadContext</code></a>, e.g.:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>template <class OS>
|
||
SyscallReturn
|
||
readFunc(SyscallDesc *desc, ThreadContext *tc,
|
||
int tgt_fd, Addr buf_ptr, int nbytes)
|
||
{
|
||
auto p = tc->getProcessPtr();</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For example, we can readily see from its interface that it contains several accessors for common process fields:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> inline uint64_t uid() { return _uid; }
|
||
inline uint64_t euid() { return _euid; }
|
||
inline uint64_t gid() { return _gid; }
|
||
inline uint64_t egid() { return _egid; }</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p><code>Process</code> is a <a href="gem5-python-c-interaction.html"><code>SimObject</code></a>, and therefore produced directly in e.g. se.py.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>se.py produces one process <a href="gem5-syscall-emulation-multiple-executables.html">per-executable given</a>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> workloads = options.cmd.split(';')
|
||
idx = 0
|
||
for wrkld in workloads:
|
||
process = Process(pid = 100 + idx)</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and those are placed in the <code>workload</code> property:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>for i in range(np):
|
||
if options.smt:
|
||
system.cpu[i].workload = multiprocesses
|
||
elif len(multiprocesses) == 1:
|
||
system.cpu[i].workload = multiprocesses[0]
|
||
else:
|
||
system.cpu[i].workload = multiprocesses[i]</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and finally each thread of a CPU gets assigned to a different such workload:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
|
||
: BaseCPU(p),
|
||
curThread(0),
|
||
branchPred(p->branchPred),
|
||
traceData(NULL),
|
||
inst(),
|
||
_status(Idle)
|
||
{
|
||
SimpleThread *thread;
|
||
|
||
for (unsigned i = 0; i < numThreads; i++) {
|
||
if (FullSystem) {
|
||
thread = new SimpleThread(this, i, p->system,
|
||
p->itb, p->dtb, p->isa[i]);
|
||
} else {
|
||
thread = new SimpleThread(this, i, p->system, p->workload[i],
|
||
p->itb, p->dtb, p->isa[i]);
|
||
}
|
||
threadInfo.push_back(new SimpleExecContext(this, thread));
|
||
ThreadContext *tc = thread->getTC();
|
||
threadContexts.push_back(tc);
|
||
}</pre>
|
||
</div>
|
||
</div>
|
||
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|
||
<ul>
|
||
</ul>
|
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|
||
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|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="gem5-execcontext-readintregoperand-register-resolution.html">gem5 <code>ExecContext::readIntRegOperand</code> register resolution</a> | ↑ Up: <a href="gem5-threadcontext-vs-threadstate-vs-execcontext-vs-process.html">gem5 <code>ThreadContext</code> vs <code>ThreadState</code> vs <code>ExecContext</code> vs <code>Process</code></a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-functional-units.html">gem5 functional units</a> →</p>
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