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scheduler: Fix page table switch for scheduler

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The userspace process may map pages where the kernel has allocated data and cause a crash.

This patch fixes this issue by having a separate IRQ handler which sets the kernel page table at the start of SchedulerInterruptHandler() and restores it in SchedulerHandlerStub() function.
This commit is contained in:
EnderIce2
2024-11-17 03:11:20 +02:00
parent 079055082a
commit 86a119ea51
9 changed files with 161 additions and 21 deletions
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35
include/cpu.hpp
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@ -641,6 +641,38 @@ namespace CPU
uint64_t ss; /* Stack Segment */
};
struct SchedulerFrame
{
uint64_t ppt; /* Process Page Table */
uint64_t opt; /* Original Page Table */
uint64_t r15; /* General purpose */
uint64_t r14; /* General purpose */
uint64_t r13; /* General purpose */
uint64_t r12; /* General purpose */
uint64_t r11; /* General purpose */
uint64_t r10; /* General purpose */
uint64_t r9; /* General purpose */
uint64_t r8; /* General purpose */
uint64_t rbp; /* Base Pointer (meant for stack frames) */
uint64_t rdi; /* Destination index for string operations */
uint64_t rsi; /* Source index for string operations */
uint64_t rdx; /* Data (commonly extends the A register) */
uint64_t rcx; /* Counter */
uint64_t rbx; /* Base */
uint64_t rax; /* Accumulator */
uint64_t InterruptNumber; /* Interrupt Number */
uint64_t ErrorCode; /* Error code */
uint64_t rip; /* Instruction Pointer */
uint64_t cs; /* Code Segment */
RFLAGS rflags; /* Register Flags */
uint64_t rsp; /* Stack Pointer */
uint64_t ss; /* Stack Segment */
};
struct ExceptionFrame
{
uint64_t cr0; /* Control Register 0 (system control) */
@ -1026,6 +1058,7 @@ namespace CPU
* @note This is for x86_64
*/
typedef x64::TrapFrame TrapFrame;
typedef x64::SchedulerFrame SchedulerFrame;
typedef x64::ExceptionFrame ExceptionFrame;
#elif defined(a32)
/**
@ -1034,6 +1067,7 @@ namespace CPU
* @note This is for x86_32
*/
typedef x32::TrapFrame TrapFrame;
typedef x32::SchedulerFrame SchedulerFrame;
typedef x32::ExceptionFrame ExceptionFrame;
#elif defined(aa64)
/**
@ -1042,6 +1076,7 @@ namespace CPU
* @note This is for aarch64
*/
typedef aarch64::TrapFrame TrapFrame;
typedef aarch64::SchedulerFrame SchedulerFrame;
typedef aarch64::TrapFrame ExceptionFrame;
#endif
}