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Save/restore fs/gs segments when re-entering host code

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This commit is contained in:
Luke Street
2025-10-05 13:58:40 -06:00
parent 04516b246c
commit cd7baffc5e
44 changed files with 669 additions and 20 deletions
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12
src/main.cpp
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@@ -347,6 +347,14 @@ int main(int argc, char **argv) {
return 1;
}
uint16_t hostFsSelector = 0;
uint16_t hostGsSelector = 0;
asm volatile("mov %%fs, %0" : "=r"(hostFsSelector));
asm volatile("mov %%gs, %0" : "=r"(hostGsSelector));
tib.hostFsSelector = hostFsSelector;
tib.hostGsSelector = hostGsSelector;
tib.hostSegmentsValid = 1;
// Determine the guest program name
auto guestArgs = wibo::splitCommandLine(cmdLine.c_str());
std::string programName;
@@ -483,6 +491,10 @@ int main(int argc, char **argv) {
// Invoke the damn thing
asm("movw %0, %%fs; call *%1" : : "r"(wibo::tibSelector), "r"(entryPoint));
if (tib.hostSegmentsValid) {
asm volatile("movw %0, %%fs" : : "r"(tib.hostFsSelector) : "memory");
asm volatile("movw %0, %%gs" : : "r"(tib.hostGsSelector) : "memory");
}
DEBUG_LOG("We came back\n");
wibo::shutdownModuleRegistry();