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kernel: implement umtx wait/wake and reject malformed timeouts

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This commit is contained in:
nmzik
2026-09-08 16:46:18 +04:00
parent 82c52c3fab
commit a64c8d3205
1 changed files with 28 additions and 0 deletions
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src/libs/libKernel.cpp
+28
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@@ -2112,6 +2112,33 @@ int KYTY_SYSV_ABI KernelSyncOnAddressWake(volatile void* address, int32_t count)
return LibKernel::SyncOnAddress::Wake(address, count);
}
int KYTY_SYSV_ABI UmtxOp(volatile void* address, int operation, uint64_t value,
void* uaddr, const void* timeout) {
constexpr int UMTX_OP_WAIT = 2;
constexpr int UMTX_OP_WAKE = 3;
EXIT_NOT_IMPLEMENTED(uaddr != nullptr);
switch (operation) {
case UMTX_OP_WAIT:
if (timeout != nullptr) {
LibKernel::KernelTimespec duration {};
std::memcpy(&duration, timeout, sizeof(duration));
if (duration.tv_sec < 0 || duration.tv_nsec < 0 || duration.tv_nsec >= 1000000000) {
*GetErrorAddr() = POSIX_EINVAL;
return -1;
}
EXIT("Valid _umtx_op timed waits are not implemented\n");
}
return POSIX_CALL(LibKernel::SyncOnAddress::Wait64(
static_cast<volatile uint64_t*>(address), value, nullptr,
LibKernel::KernelDispatchPendingSignalForCurrentThread));
case UMTX_OP_WAKE:
return POSIX_CALL(LibKernel::SyncOnAddress::Wake(address, static_cast<int32_t>(value)));
default: EXIT("Unsupported _umtx_op operation: %d\n", operation);
}
}
LIB_DEFINE(InitLibKernel_1_Posix) {
LIB_FUNC("k+AXqu2-eBc", getpagesize);
LIB_FUNC("lLMT9vJAck0", clock_gettime);
@@ -3310,6 +3337,7 @@ static void AddLibkernelUnityFunc(Loader::SymbolDatabase* s, const char* nid, ui
}
LIB_DEFINE(InitLibKernel_1) {
LIB_FUNC("04AjkP0jO9U", Posix::UmtxOp);
InitLibKernel_1_FS(s);
InitLibKernel_1_Mem(s);
InitLibKernel_1_Equeue(s);