merge branch memory-shit into higher-half

2025-05-10 15:48:10 +03:00
parent 65f543fa92
commit 767e74976f
14 changed files with 419 additions and 178 deletions
@@ -0,0 +1,47 @@
+section .text
+global page_fault_handler
+extern handle_page_fault ; C function to process the fault
+
+page_fault_handler:
+    ; Save registers to preserve state
+    pushad                ; Push EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI
+    push ds
+    push es
+    push fs
+    push gs
+
+    ; Set up kernel data segment
+    mov ax, 0x10          ; Kernel data segment selector (adjust based on your GDT)
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+
+    ; Get the faulting address from CR2
+    mov eax, cr2
+
+    ; Push parameters for the C function:
+    ; - Faulting address (from CR2)
+    ; - Error code (at [esp + 48], after pushed registers and segment selectors)
+    push eax              ; Push CR2 (faulting address)
+    mov ebx, [esp + 48]   ; Get error code (adjust offset based on stack layout)
+    push ebx              ; Push error code
+
+    ; Call the C handler
+    call handle_page_fault
+
+    ; Clean up parameters from stack
+    add esp, 8            ; Remove error code and CR2
+
+    ; Restore registers
+    pop gs
+    pop fs
+    pop es
+    pop ds
+    popad
+
+    ; Remove error code from stack
+    add esp, 4            ; Pop error code
+
+    ; Return from interrupt
+    iret                  ; Restore EIP, CS, EFLAGS (and ESP, SS if privilege change)