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;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2022. All rights reserved. ;;

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

;;                                                              ;;

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$Revision: 10002 $

struct EXCEPT_STACK

    RegEIP     dd ?

    ExcCode    dd ? ; only exception 12 overflow stack

    OldESP     dd ?

    RegCR2     dd ?

    LockAccess dd ?

ends

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

        mov     ecx, 23

        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

        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+ are IRQ handlers

        dd irq0

        rept 12 irqn:1  \{dd irq_serv.irq_\#irqn\}

        dd irqD

        rept 18 irqn:14 \{dd irq_serv.irq_\#irqn\}

        ; int_0x40 gate trap (for directly copied)

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

        rept 23 irqn:33 \{dd irq_serv.irq_\#irqn\}

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

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

        dd      idts ; 0x8000B100

        dw      0    ; alignment

  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_u

                dd  msg_exc_u,msg_exc_11

  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

  msg_exc_11    db "Alignment Check", 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:                   ; foolproof: selectors are clobbered ...

        pop     [ss:pf_err_code]  ; actually, until the next #PF

        cmp     edi, CONTROL_EXCEPTION ; equ 'EXPT'

        jne     .no_ctrl_exc

        bt      dword [esp], 31

        jc      .setret

        test    esi, esi

        jl      .no_ctrl_exc

.setret:

        mov     [esp], esi

        iret

.no_ctrl_exc:

        save_ring3_context

        mov     bl, 14

exc_c:                            ; exceptions (all but 7th - #NM)

 ; stack frame when exception/interrupt from ring3 + pushad (i.e right here)

  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

 ; this if frame from 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       ; exception

        mov     ds, ax             ; load proper values

        mov     es, ax             ; to registers

        cld                        ; clear the direction flag

        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

; not debuggee => say error and terminate

        call    show_error_parameters  ; this function output in edx = current_slot

        sti

        mov     [edx + APPDATA.state], TSTATE_TERMINATING

        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

        mov     ebx, [current_slot]

        push    [ebx + APPDATA.tid] ; PID

        push    ecx             ; debug_message code ((here: ecx==1/3))

        mov     cl, 12          ; debug_message size

        call    debugger_notify ;; only ONE using, inline ??? SEE: core/debug.inc

        add     esp, 12

        mov     edx, [current_slot]

        mov     [edx + APPDATA.state], TSTATE_RUN_SUSPENDED

        call    change_task     ; SEE: core/shed.inc

        restore_ring3_context

        iretd

IRetToUserHook:

        cmp     ebx, 12

        je      .ex_stack

        cmp     ebx, 14

        jne     .nostack