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Kernel: Turn Thread::current and Process::current into functions

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This allows us to query the current thread and process on a
per processor basis
This commit is contained in:
Tom 2020-06-28 15:34:31 -06:00 • committed by Andreas Kling
parent cdc78515b6
commit 16783bd14d
39 changed files with 518 additions and 369 deletions
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31
Kernel/Syscall.cpp
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@ -87,8 +87,9 @@ static Handler s_syscall_table[] = {
int handle(RegisterState& regs, u32 function, u32 arg1, u32 arg2, u32 arg3)
{
ASSERT_INTERRUPTS_ENABLED();
auto& process = *Process::current;
Thread::current->did_syscall();
auto current_thread = Thread::current();
auto& process = current_thread->process();
current_thread->did_syscall();
if (function == SC_exit || function == SC_exit_thread) {
// These syscalls need special handling since they never return to the caller.
@ -126,15 +127,17 @@ void syscall_handler(TrapFrame* trap)
auto& regs = *trap->regs;
// Special handling of the "gettid" syscall since it's extremely hot.
// FIXME: Remove this hack once userspace locks stop calling it so damn much.
auto current_thread = Thread::current();
auto& process = current_thread->process();
if (regs.eax == SC_gettid) {
regs.eax = Process::current->sys$gettid();
Thread::current->did_syscall();
regs.eax = process.sys$gettid();
current_thread->did_syscall();
return;
}
if (Thread::current->tracer() && Thread::current->tracer()->is_tracing_syscalls()) {
Thread::current->tracer()->set_trace_syscalls(false);
Thread::current->tracer_trap(regs);
if (current_thread->tracer() && current_thread->tracer()->is_tracing_syscalls()) {
current_thread->tracer()->set_trace_syscalls(false);
current_thread->tracer_trap(regs);
}
// Make sure SMAP protection is enabled on syscall entry.
@ -146,8 +149,6 @@ void syscall_handler(TrapFrame* trap)
asm volatile(""
: "=m"(*ptr));
auto& process = *Process::current;
if (!MM.validate_user_stack(process, VirtualAddress(regs.userspace_esp))) {
dbg() << "Invalid stack pointer: " << String::format("%p", regs.userspace_esp);
handle_crash(regs, "Bad stack on syscall entry", SIGSTKFLT);
@ -174,18 +175,18 @@ void syscall_handler(TrapFrame* trap)
u32 arg3 = regs.ebx;
regs.eax = (u32)Syscall::handle(regs, function, arg1, arg2, arg3);
if (Thread::current->tracer() && Thread::current->tracer()->is_tracing_syscalls()) {
Thread::current->tracer()->set_trace_syscalls(false);
Thread::current->tracer_trap(regs);
if (current_thread->tracer() && current_thread->tracer()->is_tracing_syscalls()) {
current_thread->tracer()->set_trace_syscalls(false);
current_thread->tracer_trap(regs);
}
process.big_lock().unlock();
// Check if we're supposed to return to userspace or just die.
Thread::current->die_if_needed();
current_thread->die_if_needed();
if (Thread::current->has_unmasked_pending_signals())
(void)Thread::current->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Signal);
if (current_thread->has_unmasked_pending_signals())
(void)current_thread->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Signal);
}
}