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Architecture
Core
Crash
Driver
Interrupts
Memory
HeapAllocators
Memory.cpp
PageMapIndexer.cpp
PhysicalMemoryManager.cpp
StackGuard.cpp
Tracker.cpp
VirtualMemoryManager.cpp
Video
CPU.cpp
Debugger.cpp
Disk.cpp
Lock.cpp
PeripheralComponentInterconnect.cpp
Power.cpp
README.md
Random.cpp
StackGuard.cpp
Symbols.cpp
SystemManagementBIOS.cpp
Time.cpp
Timer.cpp
UndefinedBehaviorSanitization.c
UniversalAsynchronousReceiverTransmitter.cpp
crashhandler.hpp
smbios.hpp
ubsan.h
Execute
FileSystem
Library
Profiling
Recovery
SystemCalls
Tasking
Tests
include
.gitignore
DAPI.hpp
Doxyfile
Fex.hpp
KConfig.cpp
KThread.cpp
Kernel.cpp
LICENSE
Makefile
README.md
dump.sh
kernel.h
syscalls.h
84 lines
3.4 KiB
C++
84 lines
3.4 KiB
C++
#include <memory.hpp>
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#include <debug.h>
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namespace Memory
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{
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StackGuard::StackGuard(bool User, PageTable4 *Table)
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{
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this->UserMode = User;
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this->Table = Table;
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if (this->UserMode)
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{
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void *AllocatedStack = KernelAllocator.RequestPages(TO_PAGES(USER_STACK_SIZE));
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debug("AllocatedStack: %p", AllocatedStack);
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memset(AllocatedStack, 0, USER_STACK_SIZE);
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for (size_t i = 0; i < TO_PAGES(USER_STACK_SIZE); i++)
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{
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Virtual(Table).Map((void *)(USER_STACK_BASE + (i * PAGE_SIZE)),
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(void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)),
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PTFlag::RW | PTFlag::US);
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debug("Mapped %p to %p", (void *)(USER_STACK_BASE + (i * PAGE_SIZE)),
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(void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)));
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}
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this->StackBottom = (void *)USER_STACK_BASE;
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this->StackTop = (void *)(USER_STACK_BASE + USER_STACK_SIZE);
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this->StackPhyiscalBottom = AllocatedStack;
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this->StackPhyiscalTop = (void *)((uintptr_t)AllocatedStack + USER_STACK_SIZE);
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this->Size = USER_STACK_SIZE;
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}
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else
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{
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this->StackBottom = KernelAllocator.RequestPages(TO_PAGES(STACK_SIZE));
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this->StackPhyiscalBottom = this->StackBottom;
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debug("StackBottom: %p", this->StackBottom);
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memset(this->StackBottom, 0, STACK_SIZE);
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this->StackTop = (void *)((uintptr_t)this->StackBottom + STACK_SIZE);
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this->StackPhyiscalTop = this->StackTop;
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this->Size = STACK_SIZE;
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}
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trace("Allocated stack at %p", this->StackBottom);
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}
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StackGuard::~StackGuard()
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{
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fixme("Temporarily disabled stack guard deallocation");
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// KernelAllocator.FreePages(this->StackBottom, TO_PAGES(this->Size));
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// debug("Freed stack at %p", this->StackBottom);
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}
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bool StackGuard::Expand(uintptr_t FaultAddress)
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{
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if (this->UserMode)
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{
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if (FaultAddress < (uintptr_t)this->StackBottom - USER_STACK_SIZE ||
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FaultAddress > (uintptr_t)this->StackTop)
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{
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return false; // It's not about the stack.
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}
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else
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{
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void *AllocatedStack = KernelAllocator.RequestPages(TO_PAGES(USER_STACK_SIZE));
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debug("AllocatedStack: %p", AllocatedStack);
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memset(AllocatedStack, 0, USER_STACK_SIZE);
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for (uintptr_t i = 0; i < TO_PAGES(USER_STACK_SIZE); i++)
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{
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Virtual(this->Table).Map((void *)((uintptr_t)this->StackBottom - (i * PAGE_SIZE)), (void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)), PTFlag::RW | PTFlag::US);
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debug("Mapped %p to %p", (void *)((uintptr_t)this->StackBottom - (i * PAGE_SIZE)), (void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)));
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}
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this->StackBottom = (void *)((uintptr_t)this->StackBottom - USER_STACK_SIZE);
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this->Size += USER_STACK_SIZE;
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info("Stack expanded to %p", this->StackBottom);
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return true;
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}
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}
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else
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{
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fixme("Not implemented and probably not needed");
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return false;
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}
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error("Reached end of function! How?");
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return false;
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}
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}
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