forked from KolibriOS/kolibrios
766 lines
23 KiB
PHP
766 lines
23 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
;; ;;
|
||
;; Copyright (C) KolibriOS team 2004-2011. 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 ;;
|
||
;; ;;
|
||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
||
$Revision$
|
||
|
||
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
|
||
mov ebx, [TASK_BASE]
|
||
push [ebx+TASKDATA.pid] ; 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, [TASK_BASE]
|
||
mov byte [edx+TASKDATA.state], 1 ; suspended
|
||
call change_task ; SEE: core/shed.inc
|
||
restore_ring3_context
|
||
iretd
|
||
|
||
IRetToUserHook:
|
||
xchg eax, [reg_eip]
|
||
sub dword[reg_esp3], 8
|
||
mov edi, [reg_esp3]
|
||
stosd
|
||
mov [edi], ebx
|
||
restore_ring3_context
|
||
; simply return control to interrupted process
|
||
unknown_interrupt:
|
||
iretd
|
||
|
||
;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
|
||
; bl - error vector
|
||
show_error_parameters:
|
||
cmp bl, 0x06
|
||
jnz .no_ud
|
||
push ebx
|
||
mov ebx, ud_user_message
|
||
mov ebp, notifyapp
|
||
call fs_execute_from_sysdir_param
|
||
pop ebx
|
||
.no_ud:
|
||
mov edx, [TASK_BASE];not scratched below
|
||
if lang eq sp
|
||
DEBUGF 1, "K : Proceso - terminado forzado PID: %x [%s]\n", [edx+TASKDATA.pid], [current_slot]
|
||
else
|
||
DEBUGF 1, "K : Process - forced terminate PID: %x [%s]\n", [edx+TASKDATA.pid], [current_slot]
|
||
end if
|
||
cmp bl, 0x08
|
||
jb .l0
|
||
cmp bl, 0x0e
|
||
jbe .l1
|
||
.l0:
|
||
mov bl, 0x09
|
||
.l1:
|
||
mov eax, [msg_fault_sel+ebx*4 - 0x08*4]
|
||
DEBUGF 1, "K : %s\n", eax
|
||
mov eax, [reg_cs3+4]
|
||
mov edi, msg_sel_app
|
||
mov ebx, [reg_esp3+4]
|
||
cmp eax, app_code
|
||
je @f
|
||
mov edi, msg_sel_ker
|
||
mov ebx, [reg_esp0+4]
|
||
@@:
|
||
DEBUGF 1, "K : EAX : %x EBX : %x ECX : %x\n", [reg_eax+4], [reg_ebx+4], [reg_ecx+4]
|
||
DEBUGF 1, "K : EDX : %x ESI : %x EDI : %x\n", [reg_edx+4], [reg_esi+4], [reg_edi+4]
|
||
DEBUGF 1, "K : EBP : %x EIP : %x ESP : %x\n", [reg_ebp+4], [reg_eip+4], ebx
|
||
DEBUGF 1, "K : Flags : %x CS : %x (%s)\n", [reg_eflags+4], eax, edi
|
||
ret
|
||
;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
|
||
|
||
restore reg_ss
|
||
restore reg_esp3
|
||
restore reg_eflags
|
||
restore reg_cs
|
||
restore reg_eip
|
||
restore reg_eax
|
||
restore reg_ecx
|
||
restore reg_edx
|
||
restore reg_ebx
|
||
restore reg_esp0
|
||
restore reg_ebp
|
||
restore reg_esi
|
||
restore reg_edi
|
||
|
||
|
||
align 4
|
||
lock_application_table:
|
||
push eax ecx edx
|
||
mov ecx, application_table_mutex
|
||
call mutex_lock
|
||
|
||
mov eax, [CURRENT_TASK]
|
||
shl eax, 5
|
||
add eax, CURRENT_TASK+TASKDATA.pid
|
||
mov eax, [eax]
|
||
|
||
mov [application_table_owner], eax
|
||
|
||
pop edx ecx eax
|
||
|
||
ret
|
||
|
||
align 4
|
||
unlock_application_table:
|
||
push eax ecx edx
|
||
|
||
mov [application_table_owner], 0
|
||
mov ecx, application_table_mutex
|
||
call mutex_unlock
|
||
|
||
pop edx ecx eax
|
||
|
||
ret
|
||
|
||
; * eax = 64 - номер функции
|
||
; * ebx = 1 - единственная подфункция
|
||
; * ecx = новый размер памяти
|
||
;Возвращаемое значение:
|
||
; * eax = 0 - успешно
|
||
; * eax = 1 - недостаточно памяти
|
||
|
||
align 4
|
||
sys_resize_app_memory:
|
||
; ebx = 1 - resize
|
||
; ecx = new amount of memory
|
||
|
||
; cmp eax,1
|
||
dec ebx
|
||
jnz .no_application_mem_resize
|
||
stdcall new_mem_resize, ecx
|
||
mov [esp+32], eax
|
||
.no_application_mem_resize:
|
||
ret
|
||
|
||
iglobal
|
||
; process_terminating db 'K : Process - terminating',13,10,0
|
||
; process_terminated db 'K : Process - done',13,10,0
|
||
msg_obj_destroy db 'K : destroy app object',13,10,0
|
||
endg
|
||
|
||
; param
|
||
; esi= slot
|
||
|
||
align 4
|
||
terminate: ; terminate application
|
||
|
||
.slot equ esp ;locals
|
||
|
||
push esi ;save .slot
|
||
|
||
shl esi, 8
|
||
cmp [SLOT_BASE+esi+APPDATA.dir_table], 0
|
||
jne @F
|
||
pop esi
|
||
shl esi, 5
|
||
mov [CURRENT_TASK+esi+TASKDATA.state], 9
|
||
ret
|
||
@@:
|
||
lea edx, [SLOT_BASE+esi]
|
||
call scheduler_remove_thread
|
||
;mov esi,process_terminating
|
||
;call sys_msg_board_str
|
||
call lock_application_table
|
||
|
||
; if the process is in V86 mode...
|
||
mov eax, [.slot]
|
||
shl eax, 8
|
||
mov esi, [eax+SLOT_BASE+APPDATA.pl0_stack]
|
||
add esi, RING0_STACK_SIZE
|
||
cmp [eax+SLOT_BASE+APPDATA.saved_esp0], esi
|
||
jz .nov86
|
||
; ...it has page directory for V86 mode
|
||
mov esi, [eax+SLOT_BASE+APPDATA.saved_esp0]
|
||
mov ecx, [esi+4]
|
||
mov [eax+SLOT_BASE+APPDATA.dir_table], ecx
|
||
; ...and I/O permission map for V86 mode
|
||
mov ecx, [esi+12]
|
||
mov [eax+SLOT_BASE+APPDATA.io_map], ecx
|
||
mov ecx, [esi+8]
|
||
mov [eax+SLOT_BASE+APPDATA.io_map+4], ecx
|
||
.nov86:
|
||
|
||
mov esi, [.slot]
|
||
shl esi, 8
|
||
add esi, SLOT_BASE+APP_OBJ_OFFSET
|
||
@@:
|
||
mov eax, [esi+APPOBJ.fd]
|
||
test eax, eax
|
||
jz @F
|
||
|
||
cmp eax, esi
|
||
je @F
|
||
|
||
push esi
|
||
call [eax+APPOBJ.destroy]
|
||
DEBUGF 1,"%s",msg_obj_destroy
|
||
pop esi
|
||
jmp @B
|
||
@@:
|
||
|
||
mov eax, [.slot]
|
||
shl eax, 8
|
||
stdcall destroy_app_space, [SLOT_BASE+eax+APPDATA.dir_table], [SLOT_BASE+eax+APPDATA.dlls_list_ptr]
|
||
|
||
mov esi, [.slot]
|
||
cmp [fpu_owner], esi ; if user fpu last -> fpu user = 2
|
||
jne @F
|
||
|
||
mov [fpu_owner], 2
|
||
mov eax, [256*2+SLOT_BASE+APPDATA.fpu_state]
|
||
clts
|
||
bt [cpu_caps], CAPS_SSE
|
||
jnc .no_SSE
|
||
fxrstor [eax]
|
||
jmp @F
|
||
.no_SSE:
|
||
fnclex
|
||
frstor [eax]
|
||
@@:
|
||
|
||
mov [KEY_COUNT], byte 0 ; empty keyboard buffer
|
||
mov [BTN_COUNT], byte 0 ; empty button buffer
|
||
|
||
|
||
; remove defined hotkeys
|
||
mov eax, hotkey_list
|
||
.loop:
|
||
cmp [eax+8], esi
|
||
jnz .cont
|
||
mov ecx, [eax]
|
||
jecxz @f
|
||
push dword [eax+12]
|
||
pop dword [ecx+12]
|
||
@@:
|
||
mov ecx, [eax+12]
|
||
push dword [eax]
|
||
pop dword [ecx]
|
||
xor ecx, ecx
|
||
mov [eax], ecx
|
||
mov [eax+4], ecx
|
||
mov [eax+8], ecx
|
||
mov [eax+12], ecx
|
||
.cont:
|
||
add eax, 16
|
||
cmp eax, hotkey_list+256*16
|
||
jb .loop
|
||
; get process PID
|
||
mov eax, esi
|
||
shl eax, 5
|
||
mov eax, [eax+CURRENT_TASK+TASKDATA.pid]
|
||
; compare current lock input with process PID
|
||
cmp eax, [PID_lock_input]
|
||
jne @f
|
||
|
||
xor eax, eax
|
||
mov [PID_lock_input], eax
|
||
@@:
|
||
; remove hotkeys in buffer
|
||
mov eax, hotkey_buffer
|
||
.loop2:
|
||
cmp [eax], esi
|
||
jnz .cont2
|
||
and dword [eax+4], 0
|
||
and dword [eax], 0
|
||
.cont2:
|
||
add eax, 8
|
||
cmp eax, hotkey_buffer+120*8
|
||
jb .loop2
|
||
|
||
mov ecx, esi ; remove buttons
|
||
bnewba2:
|
||
mov edi, [BTN_ADDR]
|
||
mov eax, edi
|
||
cld
|
||
movzx ebx, word [edi]
|
||
inc bx
|
||
bnewba:
|
||
dec bx
|
||
jz bnmba
|
||
add eax, 0x10
|
||
cmp cx, [eax]
|
||
jnz bnewba
|
||
pusha
|
||
mov ecx, ebx
|
||
inc ecx
|
||
shl ecx, 4
|
||
mov ebx, eax
|
||
add eax, 0x10
|
||
call memmove
|
||
dec dword [edi]
|
||
popa
|
||
jmp bnewba2
|
||
bnmba:
|
||
|
||
pusha ; save window coordinates for window restoring
|
||
cld
|
||
shl esi, 5
|
||
add esi, window_data
|
||
mov eax, [esi+WDATA.box.left]
|
||
mov [draw_limits.left], eax
|
||
add eax, [esi+WDATA.box.width]
|
||
mov [draw_limits.right], eax
|
||
mov eax, [esi+WDATA.box.top]
|
||
mov [draw_limits.top], eax
|
||
add eax, [esi+WDATA.box.height]
|
||
mov [draw_limits.bottom], eax
|
||
|
||
xor eax, eax
|
||
mov [esi+WDATA.box.left], eax
|
||
mov [esi+WDATA.box.width], eax
|
||
mov [esi+WDATA.box.top], eax
|
||
mov [esi+WDATA.box.height], eax
|
||
mov [esi+WDATA.cl_workarea], eax
|
||
mov [esi+WDATA.cl_titlebar], eax
|
||
mov [esi+WDATA.cl_frames], eax
|
||
mov dword [esi+WDATA.reserved], eax; clear all flags: wstate, redraw, wdrawn
|
||
lea edi, [esi-window_data+draw_data]
|
||
mov ecx, 32/4
|
||
rep stosd
|
||
popa
|
||
|
||
; debuggee test
|
||
pushad
|
||
mov edi, esi
|
||
shl edi, 5
|
||
mov eax, [SLOT_BASE+edi*8+APPDATA.debugger_slot]
|
||
test eax, eax
|
||
jz .nodebug
|
||
movi ecx, 8
|
||
push dword [CURRENT_TASK+edi+TASKDATA.pid]; PID
|
||
push 2
|
||
call debugger_notify
|
||
pop ecx
|
||
pop ecx
|
||
.nodebug:
|
||
popad
|
||
|
||
mov ebx, [.slot]
|
||
shl ebx, 8
|
||
push ebx
|
||
mov ebx, [SLOT_BASE+ebx+APPDATA.pl0_stack]
|
||
|
||
stdcall kernel_free, ebx
|
||
|
||
pop ebx
|
||
mov ebx, [SLOT_BASE+ebx+APPDATA.cur_dir]
|
||
stdcall kernel_free, ebx
|
||
|
||
mov edi, [.slot]
|
||
shl edi, 8
|
||
add edi, SLOT_BASE
|
||
|
||
mov eax, [edi+APPDATA.io_map]
|
||
cmp eax, [SLOT_BASE+256+APPDATA.io_map]
|
||
je @F
|
||
call free_page
|
||
@@:
|
||
mov eax, [edi+APPDATA.io_map+4]
|
||
cmp eax, [SLOT_BASE+256+APPDATA.io_map+4]
|
||
je @F
|
||
call free_page
|
||
@@:
|
||
mov eax, 0x20202020
|
||
stosd
|
||
stosd
|
||
stosd
|
||
mov ecx, 244/4
|
||
xor eax, eax
|
||
rep stosd
|
||
|
||
; activate window
|
||
movzx eax, word [WIN_STACK + esi*2]
|
||
cmp eax, [TASK_COUNT]
|
||
jne .dont_activate
|
||
pushad
|
||
.check_next_window:
|
||
dec eax
|
||
cmp eax, 1
|
||
jbe .nothing_to_activate
|
||
lea esi, [WIN_POS+eax*2]
|
||
movzx edi, word [esi] ; edi = process
|
||
shl edi, 5
|
||
cmp [CURRENT_TASK + edi + TASKDATA.state], byte 9 ; skip dead slots
|
||
je .check_next_window
|
||
add edi, window_data
|
||
; \begin{diamond}[19.09.2006]
|
||
; skip minimized windows
|
||
test [edi + WDATA.fl_wstate], WSTATE_MINIMIZED
|
||
jnz .check_next_window
|
||
; \end{diamond}
|
||
call waredraw
|
||
.nothing_to_activate:
|
||
popad
|
||
.dont_activate:
|
||
|
||
push esi ; remove hd1 & cd & flp reservation
|
||
shl esi, 5
|
||
mov esi, [esi+CURRENT_TASK+TASKDATA.pid]
|
||
cmp [cd_status], esi
|
||
jnz @f
|
||
call free_cd_channel
|
||
and [cd_status], 0
|
||
@@:
|
||
cmp [flp_status], esi
|
||
jnz @f
|
||
and [flp_status], 0
|
||
@@:
|
||
pop esi
|
||
cmp [bgrlockpid], esi
|
||
jnz @f
|
||
and [bgrlockpid], 0
|
||
and [bgrlock], 0
|
||
@@:
|
||
|
||
pusha ; remove all port reservations
|
||
mov edx, esi
|
||
shl edx, 5
|
||
add edx, CURRENT_TASK
|
||
mov edx, [edx+TASKDATA.pid]
|
||
|
||
rmpr0:
|
||
|
||
mov esi, [RESERVED_PORTS]
|
||
|
||
test esi, esi
|
||
jz rmpr9
|
||
|
||
rmpr3:
|
||
|
||
mov edi, esi
|
||
shl edi, 4
|
||
add edi, RESERVED_PORTS
|
||
|
||
cmp edx, [edi]
|
||
je rmpr4
|
||
|
||
dec esi
|
||
jnz rmpr3
|
||
|
||
jmp rmpr9
|
||
|
||
rmpr4:
|
||
|
||
mov ecx, 256
|
||
sub ecx, esi
|
||
shl ecx, 4
|
||
|
||
mov esi, edi
|
||
add esi, 16
|
||
cld
|
||
rep movsb
|
||
|
||
dec dword [RESERVED_PORTS]
|
||
|
||
jmp rmpr0
|
||
|
||
rmpr9:
|
||
|
||
popa
|
||
mov edi, esi ; do not run this process slot
|
||
shl edi, 5
|
||
mov [edi+CURRENT_TASK + TASKDATA.state], byte 9
|
||
; debugger test - terminate all debuggees
|
||
mov eax, 2
|
||
mov ecx, SLOT_BASE+2*0x100+APPDATA.debugger_slot
|
||
.xd0:
|
||
cmp eax, [TASK_COUNT]
|
||
ja .xd1
|
||
cmp dword [ecx], esi
|
||
jnz @f
|
||
and dword [ecx], 0
|
||
pushad
|
||
xchg eax, ecx
|
||
mov ebx, 2
|
||
call sys_system
|
||
popad
|
||
@@:
|
||
inc eax
|
||
add ecx, 0x100
|
||
jmp .xd0
|
||
.xd1:
|
||
; call systest
|
||
sti ; .. and life goes on
|
||
|
||
mov eax, [draw_limits.left]
|
||
mov ebx, [draw_limits.top]
|
||
mov ecx, [draw_limits.right]
|
||
mov edx, [draw_limits.bottom]
|
||
call calculatescreen
|
||
xor eax, eax
|
||
xor esi, esi
|
||
call redrawscreen
|
||
|
||
call unlock_application_table
|
||
;mov esi,process_terminated
|
||
;call sys_msg_board_str
|
||
add esp, 4
|
||
ret
|
||
restore .slot
|
||
|
||
;build_scheduler:
|
||
; mov esi, boot_sched_1
|
||
; call boot_log
|
||
; call build_process_gdt_tss_pointer
|
||
|
||
; mov esi,boot_sched_2
|
||
; call boot_log
|
||
; ret
|
||
|
||
; Three following procedures are used to guarantee that
|
||
; some part of kernel code will not be terminated from outside
|
||
; while it is running.
|
||
; Note: they do not protect a thread from terminating due to errors inside
|
||
; the thread; accessing a nonexisting memory would still terminate it.
|
||
|
||
; First two procedures must be used in pair by thread-to-be-protected
|
||
; to signal the beginning and the end of an important part.
|
||
; It is OK to have nested areas.
|
||
|
||
; The last procedure must be used by outside wanna-be-terminators;
|
||
; if it is safe to terminate the given thread immediately, it returns eax=1;
|
||
; otherwise, it returns eax=0 and notifies the target thread that it should
|
||
; terminate itself when leaving a critical area (the last critical area if
|
||
; they are nested).
|
||
|
||
; Implementation. Those procedures use one dword in APPDATA for the thread,
|
||
; APPDATA.terminate_protection.
|
||
; * The upper bit is 1 during normal operations and 0 when terminate is requested.
|
||
; * Other bits form a number = depth of critical regions,
|
||
; plus 1 if the upper bit is 1.
|
||
; * When this dword goes to zero, the thread should be destructed,
|
||
; and the procedure in which it happened becomes responsible for destruction.
|
||
|
||
; Enter critical area. Called by thread which wants to be protected.
|
||
proc protect_from_terminate
|
||
mov edx, [current_slot]
|
||
; Atomically increment depth of critical areas and get the old value.
|
||
mov eax, 1
|
||
lock xadd [edx+APPDATA.terminate_protection], eax
|
||
; If the old value was zero, somebody has started to terminate us,
|
||
; so we are destructing and cannot do anything protected.
|
||
; Otherwise, return to the caller.
|
||
test eax, eax
|
||
jz @f
|
||
ret
|
||
@@:
|
||
; Wait for somebody to finish us.
|
||
call change_task
|
||
jmp @b
|
||
endp
|
||
|
||
; Leave critical area. Called by thread which wants to be protected.
|
||
proc unprotect_from_terminate
|
||
mov edx, [current_slot]
|
||
; Atomically decrement depth of critical areas.
|
||
lock dec [edx+APPDATA.terminate_protection]
|
||
; If the result of decrement is zero, somebody has requested termination,
|
||
; but at that moment we were inside a critical area; terminate now.
|
||
jz sys_end
|
||
; Otherwise, return to the caller.
|
||
ret
|
||
endp
|
||
|
||
; Request termination of thread identified by edx = SLOT_BASE + slot*256.
|
||
; Called by anyone.
|
||
proc request_terminate
|
||
xor eax, eax ; set return value
|
||
; Atomically clear the upper bit. If it was already zero, then
|
||
; somebody has requested termination before us, so just exit.
|
||
lock btr [edx+APPDATA.terminate_protection], 31
|
||
jnc .unsafe
|
||
; Atomically decrement depth of critical areas.
|
||
lock dec [edx+APPDATA.terminate_protection]
|
||
; If the result of decrement is nonzero, the target thread is inside a
|
||
; critical area; leave termination to leaving that area.
|
||
jnz .unsafe
|
||
; Otherwise, it is safe to kill the target now and the caller is responsible
|
||
; for this. Return eax=1.
|
||
inc eax
|
||
.unsafe:
|
||
ret
|
||
endp
|
||
|