| 544,23 → 544,14 |
|---|
| |
| |
| align 4 |
| ; Now it is called from sys32::exc_c (see stack frame there) |
| proc page_fault_handler |
| |
| test byte [esp+12+2], 2 |
| jnz v86_page_fault |
| |
| .err_code equ ebp+32 |
| .err_addr equ ebp-4 |
| |
| pushad |
| mov ebp, esp |
| mov eax, cr2 |
| push eax |
| |
| mov ax, app_data |
| mov ds, ax |
| mov es, ax |
| |
| mov ebx, cr2 |
| push ebx ; that is locals: .err_addr = cr2 |
| inc [pg_data.pages_faults] |
| |
| ; push eax |
| 571,10 → 562,9 |
|---|
| ; pop edx |
| ; pop eax |
| |
| mov ebx, [.err_addr] |
| mov eax, [.err_code] |
| mov eax, [pf_err_code] |
| |
| cmp ebx, OS_BASE |
| cmp ebx, OS_BASE ;ebx == .err_addr |
| jb .user_space ;ñòðàíèöà â ïàìÿòè ïðèëîæåíèÿ ; |
| |
| cmp ebx, page_tabs |
| 583,7 → 573,7 |
|---|
| cmp ebx, kernel_tabs |
| jb .alloc;.app_tabs ;òàáëèöû ñòðàíèö ïðèëîæåíèÿ ; |
| ;ïðîñòî ñîçäàäèì îäíó |
| |
| if 0 ;ïîêà ýòî ïðîñòî ëèøíåå |
| cmp ebx, LFB_BASE |
| jb .core_tabs ;òàáëèöû ñòðàíèö ÿäðà |
| ;Îøèáêà |
| 591,8 → 581,13 |
|---|
| ;îáëàñòü LFB |
| ;Îøèáêà |
| jmp .fail |
| end if |
| .core_tabs: |
| .fail: ;simply return to caller |
| mov esp, ebp |
| mov bl, 14 ;#PF |
| ret |
| |
| align 4 |
| .user_space: |
| test eax, PG_MAP |
| jnz .err_access ;Ñòðàíèöà ïðèñóòñòâóåò |
| 615,33 → 610,32 |
|---|
| test eax, eax |
| jz .fail |
| |
| stdcall map_page,[ebp-4],eax,dword PG_UW |
| stdcall map_page,[.err_addr],eax,dword PG_UW |
| |
| mov edi, [ebp-4] |
| mov edi, [.err_addr] |
| and edi, 0xFFFFF000 |
| mov ecx, 1024 |
| xor eax, eax |
| cld |
| ;cld ;caller is duty for this |
| rep stosd |
| .exit: |
| mov esp, ebp |
| popad |
| add esp, 4 |
| .exit: ;iret with repeat fault instruction |
| add esp,8 ; clear in stack: locals(.err_addr) + ret_to_caller |
| restore_ring3_context |
| iretd |
| |
| .err_access: |
| .err_access = .fail |
| ;íèêîãäà íå ïðîèñõîäèò |
| jmp .fail |
| ;jmp .fail |
| |
| .kernel_space: |
| test eax, PG_MAP |
| jz .fail ;ñòðàíèöà íå ïðèñóòñòâóåò |
| |
| test eax, 4 ;U/S |
| test eax,12 ;U/S (+below) |
| jnz .fail ;ïðèëîæåíèå îáðàòèëîñü ê ïàìÿòè |
| ;ÿäðà |
| test eax, 8 |
| jnz .fail ;óñòàíîâëåí çàðåçåðâèðîâàííûé áèò |
| ;test eax, 8 |
| ;jnz .fail ;óñòàíîâëåí çàðåçåðâèðîâàííûé áèò |
| ;â òàáëèöàõ ñòðàíèö. äîáàâëåíî â P4/Xeon |
| |
| ;ïîïûòêà çàïèñè â çàùèù¸ííóþ ñòðàíèöó ÿäðà |
| 660,7 → 654,7 |
|---|
| jz .fail |
| |
| push eax |
| stdcall map_page,[ebp-4],eax,dword PG_SW |
| stdcall map_page,[.err_addr],eax,dword PG_SW |
| pop eax |
| mov edi, [.err_addr] |
| and edi, -4096 |
| 674,26 → 668,9 |
|---|
| |
| add esi, [default_io_map] |
| mov ecx, 4096/4 |
| cld |
| ;cld ;caller is duty for this |
| rep movsd |
| jmp .exit |
| |
| |
| ;íå îáðàáàòûâàåì. Îøèáêà |
| |
| .core_tabs: |
| .fail: |
| mov esp, ebp |
| popad |
| add esp, 4 |
| |
| ; iretd |
| |
| save_ring3_context ;debugger support |
| |
| mov bl, 14 |
| jmp exc_c |
| iretd |
| endp |
| |
| align 4 |
| 1346,6 → 1323,3 |
|---|
| .fail: |
| ret |
| endp |
| |
| |
| |