Subversion Repositories Kolibri OS

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;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;;

;; Distributed under terms of the GNU General Public License    ;;

;;                                                              ;;

;;                                                              ;;

;;  MenuetOS process management, protected ring3                ;;

;;                                                              ;;

;;  Distributed under GPL. See file COPYING for details.        ;;

;;  Copyright 2003 Ville Turjanmaa                              ;;

;;                                                              ;;

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$Revision: 5565 $

align 4 ;3A08

build_interrupt_table:

        mov     edi, idts

        mov     esi, sys_int

        mov     ecx, 0x40

        mov     eax, (10001110b shl 24) + os_code

  @@:

        movsw   ;low word of code-entry

        stosd   ;interrupt gate type : os_code selector

        movsw   ;high word of code-entry

        loop    @b

        movsd   ;copy low  dword of trap gate for int 0x40

        movsd   ;copy high dword of trap gate for int 0x40

        lidt    [esi]

        ret

iglobal

  align 4

  sys_int:

    ;exception handlers addresses (for interrupt gate construction)

        dd      e0,e1,e2,e3,e4,e5,e6,except_7 ; SEE: core/fpu.inc

        dd      e8,e9,e10,e11,e12,e13,page_fault_exc,e15

        dd      e16, e17,e18, e19

        times   12 dd unknown_interrupt ;int_20..int_31

    ;interrupt handlers addresses (for interrupt gate construction)

        ; 0x20 .. 0x2F - IRQ handlers

        dd      irq0, irq_serv.irq_1, irq_serv.irq_2

        dd      irq_serv.irq_3, irq_serv.irq_4

        dd      irq_serv.irq_5,  irq_serv.irq_6,  irq_serv.irq_7

        dd      irq_serv.irq_8,  irq_serv.irq_9,  irq_serv.irq_10

        dd      irq_serv.irq_11, irq_serv.irq_12, irqD, irq_serv.irq_14, irq_serv.irq_15

        dd irq_serv.irq_16

        dd irq_serv.irq_17

        dd irq_serv.irq_18

        dd irq_serv.irq_19

        dd irq_serv.irq_20

        dd irq_serv.irq_21

        dd irq_serv.irq_22

        dd irq_serv.irq_23

    times 32 - IRQ_RESERVED dd unknown_interrupt

    ;int_0x40 gate trap (for directly copied)

        dw      i40 and 0xFFFF, os_code, 11101111b shl 8, i40 shr 16

  idtreg: ; data for LIDT instruction (!!! must be immediately below sys_int data)

        dw      2*($-sys_int-4)-1

        dd      idts ;0x8000B100

        dw      0    ;просто выравнивание

  msg_fault_sel dd  msg_exc_8,msg_exc_u,msg_exc_a,msg_exc_b

                dd  msg_exc_c,msg_exc_d,msg_exc_e

  msg_exc_8     db "Double fault", 0

  msg_exc_u     db "Undefined Exception", 0

  msg_exc_a     db "Invalid TSS", 0

  msg_exc_b     db "Segment not present", 0

  msg_exc_c     db "Stack fault", 0

  msg_exc_d     db "General protection fault", 0

  msg_exc_e     db "Page fault", 0

  if lang eq sp

    include 'core/sys32-sp.inc'

  else

    msg_sel_ker   db "kernel", 0

    msg_sel_app   db "application", 0

  end if

endg

macro save_ring3_context {

        pushad

}

macro restore_ring3_context {

        popad

}

macro exc_wo_code [num] {

  e#num :

        save_ring3_context

        mov     bl, num

        jmp     exc_c

} exc_wo_code   0,1,2,3,4,5,6,15,16,19

macro exc_w_code [num] {

  e#num :

        add     esp, 4

        save_ring3_context

        mov     bl, num

        jmp     exc_c

} exc_w_code    8,9,10,11,12,13,17,18

uglobal

  pf_err_code   dd ?

endg

page_fault_exc:                 ; дуракоусточивость: селекторы испорчены...

        pop     [ss:pf_err_code]; действительно до следующего #PF

        save_ring3_context

        mov     bl, 14

exc_c:                          ; исключения (все, кроме 7-го - #NM)

; Фрэйм стека при исключении/прерывании из 3-го кольца + pushad (т.е., именно здесь)

  reg_ss        equ esp+0x30

  reg_esp3      equ esp+0x2C

  reg_eflags    equ esp+0x28

  reg_cs3       equ esp+0x24

  reg_eip       equ esp+0x20

 ; это фрэйм от pushad

  reg_eax       equ esp+0x1C

  reg_ecx       equ esp+0x18

  reg_edx       equ esp+0x14

  reg_ebx       equ esp+0x10

  reg_esp0      equ esp+0x0C

  reg_ebp       equ esp+0x08

  reg_esi       equ esp+0x04

  reg_edi       equ esp+0x00

        mov     ax, app_data        ;исключение

        mov     ds, ax                  ;загрузим правильные значения

        mov     es, ax                  ;в регистры

        cld                     ; и приводим DF к стандарту

        movzx   ebx, bl

; redirect to V86 manager? (EFLAGS & 0x20000) != 0?

        test    byte[reg_eflags+2], 2

        jnz     v86_exc_c

        cmp     bl, 14          ; #PF

        jne     @f

        call    page_fault_handler ; SEE: core/memory.inc

  @@:

        mov     esi, [current_slot]

        btr     [esi+APPDATA.except_mask], ebx

        jnc     @f

        mov     eax, [esi+APPDATA.exc_handler]

        test    eax, eax

        jnz     IRetToUserHook

  @@:

        cli

        mov     eax, [esi+APPDATA.debugger_slot]

        test    eax, eax

        jnz     .debug

        sti

; not debuggee => say error and terminate

        call    show_error_parameters ;; only ONE using, inline ???

       ;mov     edx, [TASK_BASE]

        mov     [edx + TASKDATA.state], byte 4 ; terminate

        call    wakeup_osloop

        call    change_task

; If we're here, then the main OS thread has crashed before initializing IDLE thread.

; Or they both have crashed. Anyway, things are hopelessly broken.

        hlt

        jmp     $-1

.debug:

; we are debugged process, notify debugger and suspend ourself

; eax=debugger PID

        mov     ecx, 1          ; debug_message code=other_exception

        cmp     bl, 1           ; #DB

        jne     .notify         ; notify debugger and suspend ourself

        mov     ebx, dr6        ; debug_message data=DR6_image

        xor     edx, edx

        mov     dr6, edx

        mov     edx, dr7

        mov     cl, not 8

  .l1:

        shl     dl, 2

        jc      @f

        and     bl, cl

  @@:

        sar     cl, 1

        jc      .l1

        mov     cl, 3           ; debug_message code=debug_exception

.notify:

        push    ebx             ; debug_message data