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[kernel] Fix bug in vmem commit

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When committing an area of vmem and splitting from a larger block, the
block that is returned was set to the unknown state, and the leading
block was incorrectly set to the desired state.

Also remove extra unused thread ctor.
This commit is contained in:
Justin C. Miller
2020-08-23 17:11:46 -07:00
parent e19fa377d7
commit 838776d7df
3 changed files with 11 additions and 25 deletions
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21
src/kernel/objects/thread.cpp
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@@ -8,20 +8,6 @@
extern "C" void kernel_to_user_trampoline();
static constexpr j6_signal_t thread_default_signals = 0;
thread::thread(process &parent, uint8_t pri, bool user) :
kobject(kobject::type::thread, thread_default_signals),
m_parent(parent),
m_state(state::loading),
m_wait_type(wait_type::none),
m_wait_data(0),
m_wait_obj(0)
{
m_tcb.pml4 = parent.pml4();
m_tcb.priority = pri;
setup_kernel_stack();
set_state(state::ready);
}
thread::thread(process &parent, uint8_t pri, uintptr_t rsp0) :
kobject(kobject::type::thread, thread_default_signals),
m_parent(parent),
@@ -32,7 +18,12 @@ thread::thread(process &parent, uint8_t pri, uintptr_t rsp0) :
{
m_tcb.pml4 = parent.pml4();
m_tcb.priority = pri;
m_tcb.rsp0 = rsp0;
if (!rsp0)
setup_kernel_stack();
else
m_tcb.rsp0 = rsp0;
set_state(state::ready);
}

10
src/kernel/objects/thread.h
View File

@@ -139,17 +139,11 @@ private:
thread(const thread &&other) = delete;
friend class process;
/// Constructor.
/// \arg parent The process which owns this thread
/// \arg pri Initial priority level of this thread
/// \arg user True if this is a userspace thread
thread(process &parent, uint8_t pri, bool user = true);
/// Constructor. Used when a kernel stack already exists.
/// \arg parent The process which owns this thread
/// \arg pri Initial priority level of this thread
/// \arg rsp0 The existing kernel stack rsp
thread(process &parent, uint8_t pri, uintptr_t rsp0);
/// \arg rsp0 The existing kernel stack rsp, 0 for none
thread(process &parent, uint8_t pri, uintptr_t rsp0 = 0);
/// Set up a new empty kernel stack for this thread.
void setup_kernel_stack();

5
src/libraries/kutil/vm_space.cpp
View File

@@ -81,6 +81,7 @@ vm_space::split_out(node_type *node, uintptr_t start, size_t size, vm_state stat
node_type *next = new node_type;
next->address = start;
next->size = node->size - leading;
next->state = state;
node->size = leading;
node->state = old_state;
@@ -97,7 +98,7 @@ vm_space::split_out(node_type *node, uintptr_t start, size_t size, vm_state stat
if (node->end() > start + size) {
// Split off remaining into new node
size_t trailing = node->size - size;
size_t trailing = node->size - size;
node->size -= trailing;
node_type *next = new node_type;
@@ -227,7 +228,7 @@ vm_space::commit(uintptr_t start, size_t size)
{
if (start == 0) {
log::debug(logs::vmem, "Committing any region of size %llx", size);
node_type *node = find_empty(m_ranges.root(), size, vm_state::reserved);
node_type *node = find_empty(m_ranges.root(), size, vm_state::committed);
if (!node) {
log::debug(logs::vmem, " found no large enough region");
return 0;