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Thread: added member m_kernel_stack_top.

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This value stores the top of a threads kernel_stack.
This commit is contained in:
Drew Stratford 2019-09-04 14:31:38 +12:00 • committed by Andreas Kling
parent bf43d94a2f
commit 259a1d56b0
2 changed files with 6 additions and 2 deletions
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6
Kernel/Thread.cpp
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@ -57,14 +57,16 @@ Thread::Thread(Process& process)
// FIXME: This memory is leaked.
// But uh, there's also no kernel process termination, so I guess it's not technically leaked...
m_kernel_stack_base = (u32)kmalloc_eternal(default_kernel_stack_size);
m_tss.esp = (m_kernel_stack_base + default_kernel_stack_size) & 0xfffffff8u;
m_kernel_stack_top = (m_kernel_stack_base + default_kernel_stack_size) & 0xfffffff8u;
m_tss.esp = m_kernel_stack_top;
} else {
// Ring3 processes need a separate stack for Ring0.
m_kernel_stack_region = MM.allocate_kernel_region(default_kernel_stack_size, String::format("Kernel Stack (Thread %d)", m_tid));
m_kernel_stack_base = m_kernel_stack_region->vaddr().get();
m_kernel_stack_top = m_kernel_stack_region->vaddr().offset(default_kernel_stack_size).get() & 0xfffffff8u;
m_tss.ss0 = 0x10;
m_tss.esp0 = m_kernel_stack_region->vaddr().offset(default_kernel_stack_size).get() & 0xfffffff8u;
m_tss.esp0 = m_kernel_stack_top;
}
// HACK: Ring2 SS in the TSS is the current PID.

2
Kernel/Thread.h
View file

@ -273,6 +273,7 @@ public:
u32 ticks_left() const { return m_ticks_left; }
u32 kernel_stack_base() const { return m_kernel_stack_base; }
u32 kernel_stack_top() const { return m_kernel_stack_top; }
u32 kernel_stack_for_signal_handler_base() const { return m_kernel_stack_for_signal_handler_region ? m_kernel_stack_for_signal_handler_region->vaddr().get() : 0; }
void set_selector(u16 s) { m_far_ptr.selector = s; }
@ -329,6 +330,7 @@ private:
u32 m_pending_signals { 0 };
u32 m_signal_mask { 0 };
u32 m_kernel_stack_base { 0 };
u32 m_kernel_stack_top { 0 };
RefPtr<Region> m_userspace_stack_region;
RefPtr<Region> m_kernel_stack_region;
RefPtr<Region> m_kernel_stack_for_signal_handler_region;