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Kernel/LibC: Allocate thread stacks in userspace

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This adds support for pthread function for stack manipulation.

Also keep track of main threads stack in the uthread
This commit is contained in:
Bananymous
2026-07-02 19:43:55 +03:00
parent 7bdd9d19d0
commit 0dc74beb0f
5 changed files with 51 additions and 25 deletions
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2
kernel/include/kernel/Process.h
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@@ -209,7 +209,7 @@ namespace Kernel
BAN::ErrorOr<long> sys_set_gsbase(void*);
BAN::ErrorOr<long> sys_get_gsbase();
BAN::ErrorOr<long> sys_thread_create(void (*entry)(void*), void* arg);
BAN::ErrorOr<long> sys_thread_create(void (*entry)(void*), void* arg, void* stack_base, size_t stack_size);
BAN::ErrorOr<long> sys_thread_exit(void* value);
BAN::ErrorOr<long> sys_thread_join(pid_t tid, void** value);
BAN::ErrorOr<long> sys_thread_getid();

20
kernel/kernel/Process.cpp
View File

@@ -3549,20 +3549,14 @@ namespace Kernel
return Thread::current().get_gsbase();
}
BAN::ErrorOr<long> Process::sys_thread_create(void (*entry)(void*), void* arg)
BAN::ErrorOr<long> Process::sys_thread_create(void (*entry)(void*), void* arg, void* stack_base, size_t stack_size)
{
auto userspace_stack = TRY(MemoryBackedRegion::create(
page_table(),
Thread::userspace_stack_size,
{ Thread::userspace_stack_base, USERSPACE_END },
MemoryRegion::Type::PRIVATE,
PageTable::UserSupervisor | PageTable::ReadWrite | PageTable::Present,
O_RDWR
));
const vaddr_t stack_vaddr = reinterpret_cast<vaddr_t>(stack_base);
if (stack_vaddr % PAGE_SIZE || stack_size % PAGE_SIZE)
return BAN::Error::from_errno(EINVAL);
const vaddr_t stack_vaddr = userspace_stack->vaddr();
const size_t stack_size = userspace_stack->size();
TRY(add_mapped_region(BAN::move(userspace_stack)));
auto* memory_region = TRY(validate_and_pin_pointer_access(stack_base, stack_size, true));
BAN::ScopeGuard _0([memory_region] { if (memory_region) memory_region->unpin(); });
const vaddr_t initial_stack_pointer = stack_vaddr + stack_size - sizeof(void*);
*reinterpret_cast<void**>(initial_stack_pointer) = arg;
@@ -3577,7 +3571,7 @@ namespace Kernel
));
thread->m_signal_block_mask = Thread::current().m_signal_block_mask;
LockGuard _(m_process_lock);
LockGuard _1(m_process_lock);
TRY(m_threads.push_back(thread));
if (auto ret = Processor::scheduler().add_thread(thread); ret.is_error())