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Kernel: Remove special-casing of sys$gettid() in syscall entry

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We had a fast-path for the gettid syscall that was useful before
we started caching the thread ID in LibC. Just get rid of it. :^)
This commit is contained in:
Andreas Kling 2020-07-18 00:12:34 +02:00
parent 485d1faf09
commit 8ec8ec8b1c
Notes: sideshowbarker 2024-07-19 04:44:15 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/8ec8ec8b1c1
1 changed files with 1 additions and 8 deletions
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9
Kernel/Syscall.cpp
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@ -125,15 +125,7 @@ int handle(RegisterState& regs, u32 function, u32 arg1, u32 arg2, u32 arg3)
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.sys$gettid();
current_thread->did_syscall();
return;
}
if (current_thread->tracer() && current_thread->tracer()->is_tracing_syscalls()) {
current_thread->tracer()->set_trace_syscalls(false);
@ -149,6 +141,7 @@ void syscall_handler(TrapFrame* trap)
asm volatile(""
: "=m"(*ptr));
auto& process = current_thread->process();
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);