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Handle host accesses for NCE Memory Trapping API

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We cannot ignore accesses from the host to a region protected by the NCE Memory Trapping API, there's often access to regions which have overlap with a protected region unintentionally and those accesses need to be handled correctly rather than leading to a crash. This is done by implementing an additional signal handler `NCE::HostSignalHandler` to lookup any potential traps on a `SIGSEGV` and handle them correctly or when there isn't a corresponding trap raise a `SIGTRAP` when debugger is connected or delegate to `signal::ExceptionalSignalHandler` when it isn't.
This commit is contained in:
PixelyIon
2022-04-03 17:37:35 +05:30
parent b04a0c386a
commit cb2614f80e
4 changed files with 53 additions and 31 deletions
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6
app/src/main/cpp/skyline/soc/host1x/command_fifo.cpp
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@ -2,6 +2,7 @@
// Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
#include <common/signal.h>
#include <nce.h>
#include <loader/loader.h>
#include <kernel/types/KProcess.h>
#include <soc.h>
@ -115,7 +116,8 @@ namespace skyline::soc::host1x {
void ChannelCommandFifo::Run() {
pthread_setname_np(pthread_self(), "ChannelCommandFifo");
try {
signal::SetSignalHandler({SIGINT, SIGILL, SIGTRAP, SIGBUS, SIGFPE, SIGSEGV}, signal::ExceptionalSignalHandler);
signal::SetSignalHandler({SIGINT, SIGILL, SIGTRAP, SIGBUS, SIGFPE}, signal::ExceptionalSignalHandler);
signal::SetSignalHandler({SIGSEGV}, nce::NCE::HostSignalHandler); // We may access NCE trapped memory
gatherQueue.Process([this](span<u32> gather) {
Logger::Debug("Processing pushbuffer: 0x{:X}, size: 0x{:X}", gather.data(), gather.size());
@ -144,4 +146,4 @@ namespace skyline::soc::host1x {
thread.join();
}
}
}
}