forked from KolibriOS/kolibrios
856 lines
25 KiB
PHP
856 lines
25 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; ;;
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;; MenuetOS process management, protected ring3 ;;
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;; ;;
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;; Distributed under GPL. See file COPYING for details. ;;
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;; Copyright 2003 Ville Turjanmaa ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 4313 $
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align 4 ;3A08
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build_interrupt_table:
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mov edi, idts
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mov esi, sys_int
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mov ecx, 0x40
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mov eax, (10001110b shl 24) + os_code
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@@:
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movsw ;low word of code-entry
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stosd ;interrupt gate type : os_code selector
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movsw ;high word of code-entry
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loop @b
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movsd ;copy low dword of trap gate for int 0x40
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movsd ;copy high dword of trap gate for int 0x40
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lidt [esi]
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ret
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iglobal
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align 4
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sys_int:
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;exception handlers addresses (for interrupt gate construction)
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dd e0,e1,e2,e3,e4,e5,e6,except_7 ; SEE: core/fpu.inc
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dd e8,e9,e10,e11,e12,e13,page_fault_exc,e15
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dd e16, e17,e18, e19
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times 12 dd unknown_interrupt ;int_20..int_31
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;interrupt handlers addresses (for interrupt gate construction)
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; 0x20 .. 0x2F - IRQ handlers
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dd irq0, irq_serv.irq_1, irq_serv.irq_2
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dd irq_serv.irq_3, irq_serv.irq_4
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dd irq_serv.irq_5, irq_serv.irq_6, irq_serv.irq_7
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dd irq_serv.irq_8, irq_serv.irq_9, irq_serv.irq_10
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dd irq_serv.irq_11, irq_serv.irq_12, irqD, irq_serv.irq_14, irq_serv.irq_15
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dd irq_serv.irq_16
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dd irq_serv.irq_17
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dd irq_serv.irq_18
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dd irq_serv.irq_19
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dd irq_serv.irq_20
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dd irq_serv.irq_21
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dd irq_serv.irq_22
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dd irq_serv.irq_23
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times 32 - IRQ_RESERVED dd unknown_interrupt
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;int_0x40 gate trap (for directly copied)
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dw i40 and 0xFFFF, os_code, 11101111b shl 8, i40 shr 16
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idtreg: ; data for LIDT instruction (!!! must be immediately below sys_int data)
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dw 2*($-sys_int-4)-1
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dd idts ;0x8000B100
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dw 0 ;просто выравнивание
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msg_fault_sel dd msg_exc_8,msg_exc_u,msg_exc_a,msg_exc_b
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dd msg_exc_c,msg_exc_d,msg_exc_e
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msg_exc_8 db "Double fault", 0
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msg_exc_u db "Undefined Exception", 0
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msg_exc_a db "Invalid TSS", 0
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msg_exc_b db "Segment not present", 0
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msg_exc_c db "Stack fault", 0
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msg_exc_d db "General protection fault", 0
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msg_exc_e db "Page fault", 0
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if lang eq sp
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include 'core/sys32-sp.inc'
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else
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msg_sel_ker db "kernel", 0
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msg_sel_app db "application", 0
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end if
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endg
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macro save_ring3_context {
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pushad
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}
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macro restore_ring3_context {
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popad
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}
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macro exc_wo_code [num] {
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e#num :
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save_ring3_context
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mov bl, num
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jmp exc_c
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} exc_wo_code 0,1,2,3,4,5,6,15,16,19
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macro exc_w_code [num] {
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e#num :
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add esp, 4
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save_ring3_context
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mov bl, num
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jmp exc_c
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} exc_w_code 8,9,10,11,12,13,17,18
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uglobal
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pf_err_code dd ?
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endg
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page_fault_exc: ; дуракоусточивость: селекторы испорчены...
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pop [ss:pf_err_code]; действительно до следующего #PF
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save_ring3_context
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mov bl, 14
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exc_c: ; исключения (все, кроме 7-го - #NM)
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; Фрэйм стека при исключении/прерывании из 3-го кольца + pushad (т.е., именно здесь)
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reg_ss equ esp+0x30
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reg_esp3 equ esp+0x2C
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reg_eflags equ esp+0x28
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reg_cs3 equ esp+0x24
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reg_eip equ esp+0x20
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; это фрэйм от pushad
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reg_eax equ esp+0x1C
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reg_ecx equ esp+0x18
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reg_edx equ esp+0x14
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reg_ebx equ esp+0x10
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reg_esp0 equ esp+0x0C
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reg_ebp equ esp+0x08
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reg_esi equ esp+0x04
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reg_edi equ esp+0x00
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mov ax, app_data ;исключение
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mov ds, ax ;загрузим правильные значения
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mov es, ax ;в регистры
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cld ; и приводим DF к стандарту
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movzx ebx, bl
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; redirect to V86 manager? (EFLAGS & 0x20000) != 0?
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test byte[reg_eflags+2], 2
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jnz v86_exc_c
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cmp bl, 14 ; #PF
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jne @f
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call page_fault_handler ; SEE: core/memory.inc
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@@:
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mov esi, [current_slot]
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btr [esi+APPDATA.except_mask], ebx
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jnc @f
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mov eax, [esi+APPDATA.exc_handler]
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test eax, eax
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jnz IRetToUserHook
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@@:
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cli
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mov eax, [esi+APPDATA.debugger_slot]
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test eax, eax
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jnz .debug
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sti
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; not debuggee => say error and terminate
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call show_error_parameters ;; only ONE using, inline ???
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;mov edx, [TASK_BASE]
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mov [edx + TASKDATA.state], byte 4 ; terminate
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call wakeup_osloop
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call change_task
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; If we're here, then the main OS thread has crashed before initializing IDLE thread.
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; Or they both have crashed. Anyway, things are hopelessly broken.
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hlt
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jmp $-1
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.debug:
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; we are debugged process, notify debugger and suspend ourself
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; eax=debugger PID
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mov ecx, 1 ; debug_message code=other_exception
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cmp bl, 1 ; #DB
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jne .notify ; notify debugger and suspend ourself
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mov ebx, dr6 ; debug_message data=DR6_image
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xor edx, edx
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mov dr6, edx
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mov edx, dr7
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mov cl, not 8
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.l1:
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shl dl, 2
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jc @f
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and bl, cl
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@@:
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sar cl, 1
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jc .l1
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mov cl, 3 ; debug_message code=debug_exception
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.notify:
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push ebx ; debug_message data
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mov ebx, [TASK_BASE]
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push [ebx+TASKDATA.pid] ; PID
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push ecx ; debug_message code ((here: ecx==1/3))
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mov cl, 12 ; debug_message size
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call debugger_notify ;; only ONE using, inline ??? SEE: core/debug.inc
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add esp, 12
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mov edx, [TASK_BASE]
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mov byte [edx+TASKDATA.state], 1 ; suspended
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call change_task ; SEE: core/shed.inc
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restore_ring3_context
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iretd
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IRetToUserHook:
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xchg eax, [reg_eip]
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sub dword[reg_esp3], 8
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mov edi, [reg_esp3]
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stosd
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mov [edi], ebx
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restore_ring3_context
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; simply return control to interrupted process
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unknown_interrupt:
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iretd
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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; bl - error vector
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show_error_parameters:
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cmp bl, 0x06
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jnz .no_ud
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push ebx
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mov ebx, ud_user_message
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mov ebp, notifyapp
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call fs_execute_from_sysdir_param
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pop ebx
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.no_ud:
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mov edx, [TASK_BASE];not scratched below
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if lang eq sp
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DEBUGF 1, "K : Proceso - terminado forzado PID: %x [%s]\n", [edx+TASKDATA.pid], [current_slot]
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else
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DEBUGF 1, "K : Process - forced terminate PID: %x [%s]\n", [edx+TASKDATA.pid], [current_slot]
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end if
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cmp bl, 0x08
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jb .l0
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cmp bl, 0x0e
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jbe .l1
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.l0:
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mov bl, 0x09
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.l1:
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mov eax, [msg_fault_sel+ebx*4 - 0x08*4]
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DEBUGF 1, "K : %s\n", eax
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mov eax, [reg_cs3+4]
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mov edi, msg_sel_app
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mov ebx, [reg_esp3+4]
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cmp eax, app_code
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je @f
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mov edi, msg_sel_ker
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mov ebx, [reg_esp0+4]
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@@:
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DEBUGF 1, "K : EAX : %x EBX : %x ECX : %x\n", [reg_eax+4], [reg_ebx+4], [reg_ecx+4]
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DEBUGF 1, "K : EDX : %x ESI : %x EDI : %x\n", [reg_edx+4], [reg_esi+4], [reg_edi+4]
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DEBUGF 1, "K : EBP : %x EIP : %x ESP : %x\n", [reg_ebp+4], [reg_eip+4], ebx
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DEBUGF 1, "K : Flags : %x CS : %x (%s)\n", [reg_eflags+4], eax, edi
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DEBUGF 1, "K : Stack dump:\n"
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push eax ebx ecx edx
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, "K : [ESP+00]: %x",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, " [ESP+04]: %x",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, " [ESP+08]: %x\n",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, "K : [ESP+12]: %x",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, " [ESP+16]: %x",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, " [ESP+20]: %x\n",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, "K : [ESP+24]: %x",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, " [ESP+28]: %x",[ebx]
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add ebx, 4
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call .check_ESP
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test eax, eax
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jnz .error_ESP
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DEBUGF 1, " [ESP+32]: %x\n",[ebx]
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pop edx ecx ebx eax
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ret
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.error_ESP:
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pop edx ecx ebx eax
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DEBUGF 1, "\n"
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DEBUGF 1, "K : Unexpected end of the stack\n"
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ret
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;--------------------------------------
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.check_ESP:
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push ebx
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shr ebx, 12
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mov ecx, ebx
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shr ecx, 10
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mov edx, [master_tab+ecx*4]
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test edx, PG_MAP
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jz .fail ;page table is not created
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;incorrect address in the program
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mov eax, [page_tabs+ebx*4]
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test eax, 2
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jz .fail ;address not reserved for use. error
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pop ebx
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xor eax, eax
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ret
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.fail:
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pop ebx
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xor eax, eax
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dec eax
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ret
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;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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restore reg_ss
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restore reg_esp3
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restore reg_eflags
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restore reg_cs
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restore reg_eip
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restore reg_eax
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restore reg_ecx
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restore reg_edx
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restore reg_ebx
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restore reg_esp0
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restore reg_ebp
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restore reg_esi
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restore reg_edi
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align 4
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lock_application_table:
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push eax ecx edx
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mov ecx, application_table_mutex
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call mutex_lock
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mov eax, [CURRENT_TASK]
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shl eax, 5
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add eax, CURRENT_TASK+TASKDATA.pid
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mov eax, [eax]
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mov [application_table_owner], eax
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pop edx ecx eax
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ret
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align 4
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unlock_application_table:
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push eax ecx edx
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mov [application_table_owner], 0
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mov ecx, application_table_mutex
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call mutex_unlock
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pop edx ecx eax
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ret
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; * eax = 64 - номер функции
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; * ebx = 1 - единственная подфункция
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; * ecx = новый размер памяти
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;Возвращаемое значение:
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; * eax = 0 - успешно
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; * eax = 1 - недостаточно памяти
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align 4
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sys_resize_app_memory:
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; ebx = 1 - resize
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; ecx = new amount of memory
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; cmp eax,1
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dec ebx
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jnz .no_application_mem_resize
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mov eax, [pg_data.pages_free]
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shl eax, 12
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cmp eax, ecx
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jae @f
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xor eax, eax
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inc eax
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jmp .store_result
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@@:
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stdcall new_mem_resize, ecx
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.store_result:
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mov [esp+32], eax
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.no_application_mem_resize:
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ret
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iglobal
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; process_terminating db 'K : Process - terminating',13,10,0
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; process_terminated db 'K : Process - done',13,10,0
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msg_obj_destroy db 'K : destroy app object',13,10,0
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endg
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; param
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; esi= slot
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align 4
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terminate: ; terminate application
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destroy_thread:
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.slot equ esp+4 ;locals
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.process equ esp ;ptr to parent process
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xchg bx, bx
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push esi ;save .slot
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shl esi, 8
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mov edx, [SLOT_BASE+esi+APPDATA.process]
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test edx, edx
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jnz @F
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pop esi
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shl esi, 5
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mov [CURRENT_TASK+esi+TASKDATA.state], 9
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ret
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@@:
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push edx ;save .process
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lea edx, [SLOT_BASE+esi]
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call scheduler_remove_thread
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call lock_application_table
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; if the process is in V86 mode...
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mov eax, [.slot]
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shl eax, 8
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mov esi, [eax+SLOT_BASE+APPDATA.pl0_stack]
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add esi, RING0_STACK_SIZE
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cmp [eax+SLOT_BASE+APPDATA.saved_esp0], esi
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jz .nov86
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; ...it has page directory for V86 mode
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mov esi, [eax+SLOT_BASE+APPDATA.saved_esp0]
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mov ecx, [esi+4]
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mov [eax+SLOT_BASE+APPDATA.process], ecx
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; ...and I/O permission map for V86 mode
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mov ecx, [esi+12]
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mov [eax+SLOT_BASE+APPDATA.io_map], ecx
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mov ecx, [esi+8]
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mov [eax+SLOT_BASE+APPDATA.io_map+4], ecx
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.nov86:
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;destroy per-thread kerlen objects
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mov esi, [.slot]
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shl esi, 8
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add esi, SLOT_BASE+APP_OBJ_OFFSET
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@@:
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mov eax, [esi+APPOBJ.fd]
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test eax, eax
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jz @F
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cmp eax, esi
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je @F
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push esi
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call [eax+APPOBJ.destroy]
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DEBUGF 1,"%s",msg_obj_destroy
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pop esi
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jmp @B
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@@:
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mov esi, [.slot]
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cmp [fpu_owner], esi ; if user fpu last -> fpu user = 2
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jne @F
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mov [fpu_owner], 2
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mov eax, [256*2+SLOT_BASE+APPDATA.fpu_state]
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clts
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bt [cpu_caps], CAPS_SSE
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jnc .no_SSE
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fxrstor [eax]
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jmp @F
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.no_SSE:
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fnclex
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frstor [eax]
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@@:
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mov [KEY_COUNT], byte 0 ; empty keyboard buffer
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mov [BTN_COUNT], byte 0 ; empty button buffer
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; remove defined hotkeys
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mov eax, hotkey_list
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.loop:
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cmp [eax+8], esi
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jnz .cont
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mov ecx, [eax]
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jecxz @f
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push dword [eax+12]
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pop dword [ecx+12]
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@@:
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mov ecx, [eax+12]
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push dword [eax]
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pop dword [ecx]
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xor ecx, ecx
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mov [eax], ecx
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mov [eax+4], ecx
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mov [eax+8], ecx
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mov [eax+12], ecx
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||
.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
|
||
@@:
|
||
lea ebx, [edi+APPDATA.list]
|
||
list_del ebx ;destroys edx, ecx
|
||
|
||
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
|
||
@@:
|
||
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:
|
||
;release slot
|
||
|
||
xchg bx, bx
|
||
|
||
bts [thr_slot_map], esi
|
||
|
||
mov ecx, [.process]
|
||
lea eax, [ecx+PROC.thr_list]
|
||
cmp eax, [eax+LHEAD.next]
|
||
jne @F
|
||
|
||
call destroy_process.internal
|
||
@@:
|
||
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, 8
|
||
ret
|
||
restore .slot
|
||
restore .process
|
||
|
||
; 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
|
||
|