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https://github.com/RGBCube/serenity
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Kernel: Conditionally acquire the big lock based on syscall metadata
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parent
bb1fa019de
commit
120b9bc05b
1 changed files with 25 additions and 18 deletions
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@ -108,8 +108,26 @@ KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, F
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auto& process = current_thread->process();
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auto& process = current_thread->process();
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current_thread->did_syscall();
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current_thread->did_syscall();
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if (function >= Function::__Count) {
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dbgln("Unknown syscall {} requested ({:08x}, {:08x}, {:08x})", function, arg1, arg2, arg3);
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return ENOSYS;
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}
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const auto syscall_metadata = s_syscall_table[function];
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if (syscall_metadata.handler == nullptr) {
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dbgln("Null syscall {} requested, you probably need to rebuild this program!", function);
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return ENOSYS;
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}
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MutexLocker mutex_locker;
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const auto needs_big_lock = syscall_metadata.needs_lock == NeedsBigProcessLock::Yes;
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if (needs_big_lock) {
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mutex_locker.attach_and_lock(process.big_lock());
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};
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if (function == SC_exit || function == SC_exit_thread) {
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if (function == SC_exit || function == SC_exit_thread) {
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// These syscalls need special handling since they never return to the caller.
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// These syscalls need special handling since they never return to the caller.
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// In these cases the process big lock will get released on the exit of the thread.
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if (auto* tracer = process.tracer(); tracer && tracer->is_tracing_syscalls()) {
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if (auto* tracer = process.tracer(); tracer && tracer->is_tracing_syscalls()) {
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regs.set_return_reg(0);
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regs.set_return_reg(0);
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@ -129,23 +147,16 @@ KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, F
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}
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}
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}
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}
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KResultOr<FlatPtr> result { FlatPtr(nullptr) };
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if (function == SC_fork || function == SC_sigreturn) {
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if (function == SC_fork || function == SC_sigreturn) {
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// These syscalls want the RegisterState& rather than individual parameters.
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// These syscalls want the RegisterState& rather than individual parameters.
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auto handler = (HandlerWithRegisterState)s_syscall_table[function].handler;
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auto handler = (HandlerWithRegisterState)syscall_metadata.handler;
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return (process.*(handler))(regs);
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result = (process.*(handler))(regs);
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} else {
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result = (process.*(syscall_metadata.handler))(arg1, arg2, arg3);
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}
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}
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if (function >= Function::__Count) {
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return result;
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dbgln("Unknown syscall {} requested ({:08x}, {:08x}, {:08x})", function, arg1, arg2, arg3);
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return ENOSYS;
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}
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if (s_syscall_table[function].handler == nullptr) {
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dbgln("Null syscall {} requested, you probably need to rebuild this program!", function);
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return ENOSYS;
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}
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return (process.*(s_syscall_table[function].handler))(arg1, arg2, arg3);
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}
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}
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}
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}
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@ -204,18 +215,14 @@ NEVER_INLINE void syscall_handler(TrapFrame* trap)
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FlatPtr arg3;
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FlatPtr arg3;
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regs.capture_syscall_params(function, arg1, arg2, arg3);
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regs.capture_syscall_params(function, arg1, arg2, arg3);
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process.big_lock().lock();
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auto result = Syscall::handle(regs, function, arg1, arg2, arg3);
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auto result = Syscall::handle(regs, function, arg1, arg2, arg3);
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if (result.is_error()) {
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if (result.is_error()) {
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regs.set_return_reg(result.error());
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regs.set_return_reg(result.error());
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} else {
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} else {
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regs.set_return_reg(result.value());
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regs.set_return_reg(result.value());
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}
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}
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process.big_lock().unlock();
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if (auto tracer = process.tracer(); tracer && tracer->is_tracing_syscalls()) {
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if (auto tracer = process.tracer(); tracer && tracer->is_tracing_syscalls()) {
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tracer->set_trace_syscalls(false);
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tracer->set_trace_syscalls(false);
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process.tracer_trap(*current_thread, regs); // this triggers SIGTRAP and stops the thread!
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process.tracer_trap(*current_thread, regs); // this triggers SIGTRAP and stops the thread!
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