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Kernel: Make userspace stack on-demand allocated

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Also bump the hardlimit of stack size from 512 KiB->32 MiB. This still
feels quite low but is much better than before :D
This commit is contained in:
Bananymous
2025-08-07 02:49:02 +03:00
parent f5bbcc017c
commit 72f85dce2b
3 changed files with 14 additions and 4 deletions
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7
kernel/kernel/Thread.cpp
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@@ -138,7 +138,7 @@ namespace Kernel
stack_addr_start, USERSPACE_END,
userspace_stack_size,
PageTable::Flags::UserSupervisor | PageTable::Flags::ReadWrite | PageTable::Flags::Present,
true, true
false, true
));
thread_deleter.disable();
@@ -217,6 +217,7 @@ namespace Kernel
save_sse();
memcpy(thread->m_sse_storage, m_sse_storage, sizeof(m_sse_storage));
TRY(thread->userspace_stack().allocate_page_for_demand_paging(thread->userspace_stack_top() - PAGE_SIZE));
PageTable::with_fast_page(thread->userspace_stack().paddr_of(thread->userspace_stack_top() - PAGE_SIZE), [=] {
PageTable::fast_page_as<void*>(PAGE_SIZE - sizeof(uintptr_t)) = arg;
});
@@ -299,6 +300,10 @@ namespace Kernel
vaddr_t vaddr = userspace_stack_top() - needed_size;
const size_t page_count = BAN::Math::div_round_up(needed_size, PAGE_SIZE);
for (size_t i = 0; i < page_count; i++)
TRY(m_userspace_stack->allocate_page_for_demand_paging(vaddr + i * PAGE_SIZE));
const auto stack_copy_buf =
[this](BAN::ConstByteSpan buffer, vaddr_t vaddr) -> void
{