Subversion Repositories Kolibri OS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;                                                              ;;

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

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

;;                                                              ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision: 5595 $

GREEDY_KERNEL  equ 0

struct  APP_HEADER_00_

        banner          dq ?

        version         dd ?    ;+8

        start           dd ?    ;+12

        i_end           dd ?    ;+16

        mem_size        dd ?    ;+20

        i_param         dd ?    ;+24

ends

struct  APP_HEADER_01_

        banner          dq ?

        version         dd ?    ;+8

        start           dd ?    ;+12

        i_end           dd ?    ;+16

        mem_size        dd ?    ;+20

        stack_top       dd ?    ;+24

        i_param         dd ?    ;+28

        i_icon          dd ?    ;+32

ends

struct  APP_PARAMS

        app_cmdline     dd ?    ;0x00

        app_path        dd ?    ;0x04

        app_eip         dd ?    ;0x08

        app_esp         dd ?    ;0x0C

        app_mem         dd ?    ;0x10

ends

macro _clear_ op

{  mov ecx, op/4

        xor     eax, eax

        cld

        rep stosd

}

fs_execute_from_sysdir:

        xor     ebx, ebx

fs_execute_from_sysdir_param:

        xor     edx, edx

        mov     esi, sysdir_path

align 4

proc fs_execute

;fn_read:dword, file_size:dword, cluster:dword

; ebx - cmdline

; edx - flags

; ebp - full filename

; [esp+4] = procedure DoRead, [esp+8] = filesize & [esp+12]... - arguments for it

       locals

         cmdline_size  dd ? ; +0 ; cmdline -12

         cmdline_adr   dd ? ; +4 ; cmdline -8

         cmdline_flag  dd ? ; +8 ; cmdline -4

         cmdline       rd 64    ;256/4

         filename      rd 256   ;1024/4

         flags         dd ?

         save_proc     dd ?

         slot          dd ?

         slot_base     dd ?

         file_base     dd ?

         file_size     dd ?

         handle        dd ? ;temp. for default cursor handle for curr. thread

                      ;app header data

         hdr_cmdline   dd ? ;0x00

         hdr_path      dd ? ;0x04

         hdr_eip       dd ? ;0x08

         hdr_esp       dd ? ;0x0C

         hdr_mem       dd ? ;0x10

         hdr_i_end     dd ? ;0x14

       endl

        pushad

        cmp     [SCR_MODE], word 0x13

        jbe     @f

        pushad

        stdcall set_cursor, [def_cursor_clock]

        mov     [handle], eax

        mov     [redrawmouse_unconditional], 1

        call    wakeup_osloop

        popad

@@:

        mov     [flags], edx

; [ebp]  pointer to filename

        lea     edi, [filename]

        lea     ecx, [edi+1024]

        mov     al, '/'

        stosb

@@:

        cmp     edi, ecx

        jae     .bigfilename

        lodsb

        stosb

        test    al, al

        jnz     @b

        mov     esi, [ebp]

        test    esi, esi

        jz      .namecopied

        mov     byte [edi-1], '/'

@@:

        cmp     edi, ecx

        jae     .bigfilename

        lodsb

        stosb

        test    al, al

        jnz     @b

        jmp     .namecopied

.bigfilename:

        popad

        mov     eax, -ERROR_FILE_NOT_FOUND

        jmp     .final

.namecopied:

        xor     eax, eax

        mov     [cmdline_flag], eax

        mov     [cmdline_adr], eax

        mov     [cmdline_size], eax

        mov     [cmdline], ebx

        test    ebx, ebx

        jz      .no_copy

;--------------------------------------

        pushad

        pushfd

        mov     esi, ebx

        mov     ecx, 65536 ; 64 Kb max for ext.cmdline

        cld

@@:

        dec     ecx

        jz      .end_string

        lodsb

        test    al, al

        jnz     @b

.end_string:

        mov     eax, 65536 ; 64 Kb max for ext.cmdline

        sub     eax, ecx

        mov     [cmdline_size], eax

        cmp     eax, 255

        ja      @f

        popfd

        popad

        jmp     .old_copy

@@:

        xor     eax, eax

        dec     eax

        mov     [cmdline_flag], eax

        popfd

        popad

; get memory for the extended command line

        stdcall kernel_alloc, [cmdline_size] ;eax

        test    eax, eax

        jz      .old_copy ; get memory failed

        mov     [cmdline_adr], eax

        pushad

        pushfd

        mov     esi, ebx

        mov     edi, eax

        mov     ecx, [cmdline_size]

        cld

        rep movsb

        popfd

        popad

        jmp     .no_copy

.old_copy:

; clear flag because old method with 256 bytes

        xor     eax, eax

        mov     [cmdline_flag], eax

;--------------------------------------

        lea     eax, [cmdline]

        mov     dword [eax+252], 0

.copy:

        stdcall strncpy, eax, ebx, 255

.no_copy:

        lea     eax, [filename]

        stdcall load_file, eax

        mov     esi, -ERROR_FILE_NOT_FOUND

        test    eax, eax

        jz      .err_file

        mov     [file_base], eax

        mov     [file_size], ebx

        lea     ebx, [hdr_cmdline]

        call    test_app_header

        mov     esi, -0x1F

        test    eax, eax

        jz      .err_hdr

        call    lock_application_table

        call    alloc_thread_slot

        test    eax, eax

        mov     esi, -0x20 ; too many processes

        jz      .err

        mov     [slot], eax

        shl     eax, 8

        add     eax, SLOT_BASE

        mov     [slot_base], eax

        mov     edi, eax

       _clear_ 256     ;clean extended information about process

; write application name

        lea     eax, [filename]

        stdcall strrchr, eax, '/'  ; now eax points to name without path

        lea     esi, [eax+1]

        test    eax, eax

        jnz     @F

        lea     esi, [filename]

@@:

        mov     ecx, 11 ; 11 chars for name! 8 - is old value!

        mov     edi, [slot_base]

.copy_process_name_loop:

        lodsb

        cmp     al, '.'

        jz      .copy_process_name_done

        test    al, al

        jz      .copy_process_name_done

        stosb

        loop    .copy_process_name_loop

.copy_process_name_done:

        mov     ebx, [current_process]

        mov     [save_proc], ebx

        stdcall create_process, [hdr_mem], [file_base], [file_size]

        mov     esi, -30; no memory

        test    eax, eax

        jz      .failed

        mov     ebx, [hdr_mem]

        mov     [eax+PROC.mem_used], ebx

        mov     ebx, [slot_base]

        mov     [ebx+APPDATA.process], eax

        lea     edx, [ebx+APPDATA.list]

        lea     ecx, [eax+PROC.thr_list]

        list_add_tail edx, ecx

        xor     edx, edx

        cmp     word [6], '02'

        jne     @f

        not     edx

@@:

        mov     [ebx+APPDATA.tls_base], edx

if GREEDY_KERNEL

else

        mov     ecx, [hdr_mem]

        mov     edi, [file_size]

        add     edi, 4095

        and     edi, not 4095

        sub     ecx, edi

        jna     @F

        xor     eax, eax

        cld

        rep stosb

@@:

end if

; release only virtual space, not phisical memory

        stdcall free_kernel_space, [file_base]

        lea     eax, [hdr_cmdline]

        lea     ebx, [cmdline]

        lea     ecx, [filename]

        stdcall set_app_params , [slot], eax, ebx, ecx, [flags]

        mov     eax, [save_proc]

        call    set_cr3

        mov     eax, [process_number];set result

        call    unlock_application_table

        jmp     .final

.failed:

        mov     eax, [save_proc]

        call    set_cr3

.err:

.err_hdr:

        stdcall kernel_free, [file_base]

.err_file:

        call    unlock_application_table

        mov     eax, esi

.final:

        cmp     [SCR_MODE], word 0x13

        jbe     @f

        pushad

        stdcall set_cursor, [handle]

        mov     [redrawmouse_unconditional], 1

        call    wakeup_osloop

        popad

@@:

        ret

endp

align 4

test_app_header:

       virtual at eax

         APP_HEADER_00 APP_HEADER_00_

       end virtual

       virtual at eax

         APP_HEADER_01 APP_HEADER_01_

       end virtual

        cmp     dword [eax], 'MENU'

        jne     .fail

        cmp     word [eax+4], 'ET'

        jne     .fail

        cmp     [eax+6], word '00'

        jne     .check_01_header

        mov     ecx, [APP_HEADER_00.start]

        mov     [ebx+0x08], ecx             ;app_eip

        mov     edx, [APP_HEADER_00.mem_size]

        mov     [ebx+0x10], edx             ;app_mem

        shr     edx, 1

        sub     edx, 0x10

        mov     [ebx+0x0C], edx             ;app_esp

        mov     ecx, [APP_HEADER_00.i_param]

        mov     [ebx], ecx                  ;app_cmdline

        mov     [ebx+4], dword 0            ;app_path

        mov     edx, [APP_HEADER_00.i_end]

        mov     [ebx+0x14], edx

        ret

 .check_01_header:

        cmp     [eax+6], word '01'

        je      @f

        cmp     [eax+6], word '02'

        jne     .fail

@@:

        mov     ecx, [APP_HEADER_01.start]

        mov     [ebx+0x08], ecx             ;app_eip

        mov     edx, [APP_HEADER_01.mem_size]

; \begin{diamond}[20.08.2006]

; sanity check (functions 19,58 load app_i_end bytes and that must

; fit in allocated memory to prevent kernel faults)

        cmp     edx, [APP_HEADER_01.i_end]

        jb      .fail

; \end{diamond}[20.08.2006]

        mov     [ebx+0x10], edx             ;app_mem

        mov     ecx, [APP_HEADER_01.stack_top]

        mov     [ebx+0x0C], ecx             ;app_esp

        mov     edx, [APP_HEADER_01.i_param]

        mov     [ebx], edx                  ;app_cmdline

        mov     ecx, [APP_HEADER_01.i_icon]

        mov     [ebx+4], ecx                ;app_path

        mov     edx, [APP_HEADER_01.i_end]

        mov     [ebx+0x14], edx

        ret

.fail:

        xor     eax, eax

        ret

align 4

alloc_thread_slot:

;input:

;  none

;result:

;  eax=[new_thread_slot]<>0 - ok

;      0 - failed.

;This function find least empty slot.

;It doesn't increase [TASK_COUNT]!

        mov     edx, thr_slot_map

        pushfd

        cli

.l1:

        bsf     eax, [edx]

        jnz     .found

        add     edx, 4

        cmp     edx, thr_slot_map+32

        jb      .l1

        popfd

        xor     eax, eax

        ret

.found:

        btr     [edx], eax

        sub     edx, thr_slot_map

        lea     eax, [eax+edx*8]

        popfd

        ret

align 4

proc create_process stdcall, app_size:dword,img_base:dword,img_size:dword

       locals

         app_pages   dd ?

         img_pages   dd ?

         process     dd ?

         app_tabs    dd ?

       endl

        push    ebx

        push    esi

        push    edi

        mov     ecx, pg_data.mutex

        call    mutex_lock

        xor     eax, eax

        mov     [process], eax

        mov     eax, [app_size]

        add     eax, 4095

        and     eax, NOT(4095)

        mov     [app_size], eax

        mov     ebx, eax

        shr     eax, 12

        mov     [app_pages], eax

        add     ebx, 0x3FFFFF

        and     ebx, NOT(0x3FFFFF)

        shr     ebx, 22

        mov     [app_tabs], ebx

        mov     ecx, [img_size]

        add     ecx, 4095

        and     ecx, NOT(4095)

        mov     [img_size], ecx

        shr     ecx, 12

        mov     [img_pages], ecx

        lea     eax, [eax+ebx+2];all requested memory

        cmp     eax, [pg_data.pages_free]

        ja      .fail

        stdcall kernel_alloc, 0x2000

        test    eax, eax

        jz      .fail

        mov     [process], eax

        lea     edi, [eax+PROC.heap_lock]

        mov     ecx, (PROC.ht_free-PROC.heap_lock)/4

        list_init eax

        add     eax, PROC.thr_list

        list_init eax

        xor     eax, eax

        cld

        rep stosd

        mov     [edi], dword (PROC.pdt_0 - PROC.htab)/4 - 3

        mov     [edi+4], dword 3           ;reserve handles for stdin stdout and stderr

        mov     ecx, (PROC.pdt_0 - PROC.htab)/4

        add     edi, 8

        inc     eax

@@:

        stosd

        inc     eax

        cmp     eax, ecx

        jbe     @B

        mov     eax, edi

        call    get_pg_addr

        mov     [edi-4096+PROC.pdt_0_phys], eax

        mov     ecx, (OS_BASE shr 20)/4

        xor     eax, eax

        rep stosd

        mov     ecx, (OS_BASE shr 20)/4

        mov     esi, sys_proc+PROC.pdt_0+(OS_BASE shr 20)

        rep movsd

        mov     eax, [edi-8192+PROC.pdt_0_phys]

        or      eax, PG_SWR

        mov     [edi-4096+(page_tabs shr 20)], eax

        lea     eax, [edi-8192]

        call    set_cr3

        mov     edx, [app_tabs]

        xor     edi, edi

@@:

        call    alloc_page

        test    eax, eax

        jz      .fail

        stdcall map_page_table, edi, eax

        add     edi, 0x00400000

        dec     edx

        jnz     @B

        mov     edi, page_tabs

        mov     ecx, [app_tabs]

        shl     ecx, 10

        xor     eax, eax

        rep stosd

        mov     ecx, [img_pages]

        mov     ebx, PG_UWR

        xor     edx, edx

        mov     esi, [img_base]

        shr     esi, 10

        add     esi, page_tabs

        mov     edi, page_tabs

.remap:

        lodsd

        and     eax, 0xFFFFF000

        or      eax, ebx; force user level r/w access

        stosd

        add     edx, 0x1000

        dec     [app_pages]

        dec     ecx

        jnz     .remap

        mov     ecx, [app_pages]

        test    ecx, ecx

        jz      .done

.alloc:

        call    alloc_page

        test    eax, eax

        jz      .fail

        stdcall map_page, edx, eax, dword PG_UWR

        add     edx, 0x1000

        dec     [app_pages]

        jnz     .alloc

.done:

        mov     ecx, pg_data.mutex

        call    mutex_unlock

        mov     eax, [process]

        pop     edi

        pop     esi

        pop     ebx

        ret

.fail:

        mov     ecx, pg_data.mutex

        call    mutex_unlock

        cmp     [process], 0

        je      @f

;;        stdcall destroy_app_space, [dir_addr], 0

@@:

        xor     eax, eax

        pop     edi

        pop     esi

        pop     ebx

        ret

endp

align 4

set_cr3:

        pushfd

        cli

        mov     ebx, [current_slot]

        mov     [current_process], eax

        mov     [ebx+APPDATA.process], eax

        mov     eax, [eax+PROC.pdt_0_phys]

        mov     cr3, eax

        popfd

        ret

align 4

proc destroy_page_table stdcall, pg_tab:dword

        push    esi

        mov     esi, [pg_tab]

        mov     ecx, 1024

.free:

        mov     eax, [esi]

        test    eax, 1

        jz      .next

        test    eax, 2

        jz      .next

        test    eax, 1 shl 9

        jnz     .next                     ;skip shared pages

        call    free_page

.next:

        add     esi, 4

        dec     ecx

        jnz     .free

        pop     esi

        ret

endp

align 4

destroy_process: ;fastcall ecx= ptr to process

        lea     eax, [ecx+PROC.thr_list]

        cmp     eax, [eax+LHEAD.next]

        jne     .exit

align 4

.internal:

        push    ecx

        mov     esi, [ecx+PROC.dlls_list_ptr]

        call    destroy_all_hdlls

;        mov     ecx, pg_data.mutex

;        call    mutex_lock

        mov     esi, [esp]

        add     esi, PROC.pdt_0

        mov     edi, (0x80000000 shr 20)/4

.destroy:

        mov     eax, [esi]

        test    eax, 1

        jz      .next

        and     eax, not 0xFFF

        stdcall map_page, [tmp_task_ptab], eax, PG_SWR

        stdcall destroy_page_table, [tmp_task_ptab]

        mov     eax, [esi]

        call    free_page

.next:

        add     esi, 4

        dec     edi

        jnz     .destroy

        call    kernel_free     ;ecx still in stack

        stdcall map_page, [tmp_task_ptab], 0, PG_UNMAP

 ;       mov     ecx, pg_data.mutex

 ;       call    mutex_unlock

.exit:

        ret

align 4

get_pid:

        mov     eax, [TASK_BASE]

        mov     eax, [eax+TASKDATA.pid]

        ret

pid_to_slot:

;Input:

;  eax - pid of process

;Output:

;  eax - slot of process or 0 if process don't exists

;Search process by PID.

        push    ebx

        push    ecx

        mov     ebx, [TASK_COUNT]

        shl     ebx, 5

        mov     ecx, 2*32

.loop:

;ecx=offset of current process info entry

;ebx=maximum permitted offset

        cmp     byte [CURRENT_TASK+ecx+0xa], 9

        jz      .endloop ;skip empty slots

        cmp     [CURRENT_TASK+ecx+0x4], eax;check PID

        jz      .pid_found

.endloop:

        add     ecx, 32

        cmp     ecx, ebx

        jle     .loop

        pop     ecx

        pop     ebx

        xor     eax, eax

        ret

.pid_found:

        shr     ecx, 5

        mov     eax, ecx ;convert offset to index of slot

        pop     ecx

        pop     ebx

        ret

check_region:

;input:

;  esi - start of buffer

;  edx - size of buffer

;result:

;  eax = 1 region lays in app memory

;  eax = 0 region don't lays in app memory

        mov     eax, 1

        ret

if 0

        mov     eax, [CURRENT_TASK]

;     jmp  check_process_region

;-----------------------------------------------------------------------------

;check_process_region:

;input:

;  eax - slot

;  esi - start of buffer

;  edx - size of buffer

;result:

;  eax = 1 region lays in app memory

;  eax = 0 region don't lays in app memory

        test    edx, edx

        jle     .ok

        shl     eax, 5

        cmp     word [CURRENT_TASK+eax+0xa], 0

        jnz     .failed

        shl     eax, 3

        mov     eax, [SLOT_BASE+eax+0xb8]

        test    eax, eax

        jz      .failed

        mov     eax, 1

        ret

.ok:

        mov     eax, 1

        ret

.failed:

        xor     eax, eax

        ret

end if

align 4

proc read_process_memory

;Input:

;  eax - process slot

;  ecx - buffer address

;  edx - buffer size

;  esi - start address in other process

;Output:

;  eax - number of bytes read.

       locals

         slot   dd ?

         buff   dd ?

         r_count    dd ?

         offset dd ?

         tmp_r_cnt  dd ?

       endl

        mov     [slot], eax

        mov     [buff], ecx

        and     [r_count], 0

        mov     [tmp_r_cnt], edx

        mov     [offset], esi

        pushad

.read_mem:

        mov     edx, [offset]

        mov     ebx, [tmp_r_cnt]

        mov     ecx, 0x400000

        and     edx, 0x3FFFFF

        sub     ecx, edx

        cmp     ecx, ebx

        jbe     @f

        mov     ecx, ebx

@@:

        cmp     ecx, 0x8000

        jna     @F

        mov     ecx, 0x8000

@@:

        mov     ebx, [offset]

        push    ecx

        stdcall map_memEx, [proc_mem_map], \

                [slot], ebx, ecx, PG_READ

        pop     ecx

        mov     esi, [offset]

        and     esi, 0xfff

        sub     eax, esi

        jbe     .ret

        cmp     ecx, eax

        jbe     @f

        mov     ecx, eax

        mov     [tmp_r_cnt], eax

@@:

        add     esi, [proc_mem_map]

        mov     edi, [buff]

        mov     edx, ecx

        rep movsb

        add     [r_count], edx

        add     [offset], edx

        sub     [tmp_r_cnt], edx

        jnz     .read_mem

.ret:

        popad

        mov     eax, [r_count]

        ret

endp

align 4

proc write_process_memory

;Input:

;  eax - process slot

;  ecx - buffer address

;  edx - buffer size

;  esi - start address in other process

;Output:

;  eax - number of bytes written

       locals

         slot   dd ?

         buff   dd ?

         w_count    dd ?

         offset dd ?

         tmp_w_cnt  dd ?

       endl

        mov     [slot], eax

        mov     [buff], ecx

        and     [w_count], 0

        mov     [tmp_w_cnt], edx

        mov     [offset], esi

        pushad

.read_mem:

        mov     edx, [offset]

        mov     ebx, [tmp_w_cnt]

        mov     ecx, 0x400000

        and     edx, 0x3FFFFF

        sub     ecx, edx

        cmp     ecx, ebx

        jbe     @f

        mov     ecx, ebx

@@:

        cmp     ecx, 0x8000

        jna     @F

        mov     ecx, 0x8000

@@:

        mov     ebx, [offset]

      ;     add ebx, new_app_base

        push    ecx

        stdcall map_memEx, [proc_mem_map], \

                [slot], ebx, ecx, PG_SWR

        pop     ecx

        mov     edi, [offset]

        and     edi, 0xfff

        sub     eax, edi

        jbe     .ret

        cmp     ecx, eax

        jbe     @f

        mov     ecx, eax

        mov     [tmp_w_cnt], eax

@@:

        add     edi, [proc_mem_map]

        mov     esi, [buff]

        mov     edx, ecx

        rep movsb

        add     [w_count], edx

        add     [offset], edx

        sub     [tmp_w_cnt], edx

        jnz     .read_mem

.ret:

        popad

        mov     eax, [w_count]

        ret

endp

;ebx = 1 - kernel thread

;ecx=thread entry point

;edx=thread stack pointer

;creation flags  0x01 - debugged

;                0x02 - kernel

align 4

proc new_sys_threads

       locals

         slot          dd ?

         flags         dd ?

         app_cmdline   dd ? ;0x00

         app_path      dd ? ;0x04

         app_eip       dd ? ;0x08

         app_esp       dd ? ;0x0C

         app_mem       dd ? ;0x10

       endl

        shl     ebx, 1

        mov     [flags], ebx

        xor     eax, eax

        mov     [app_eip], ecx

        mov     [app_cmdline], eax

        mov     [app_esp], edx

        mov     [app_path], eax

        call    lock_application_table

        call    alloc_thread_slot

        test    eax, eax

        jz      .failed

        mov     [slot], eax

        mov     esi, [current_slot]

        mov     ebx, esi      ;ebx=esi - pointer to extended information about current thread

        mov     edi, eax

        shl     edi, 8

        add     edi, SLOT_BASE

        mov     edx, edi      ;edx=edi - pointer to extended infomation about new thread

        mov     ecx, 256/4

        xor     eax, eax

        cld

        rep stosd             ;clean extended information about new thread

        mov     esi, ebx

        mov     edi, edx

        mov     ecx, 11

        rep movsb             ;copy process name

        mov     eax, [ebx+APPDATA.process]

        mov     [edx+APPDATA.process], eax

        lea     ebx, [edx+APPDATA.list]

        lea     ecx, [eax+PROC.thr_list]

        list_add_tail ebx, ecx               ;add thread to process child's list

        mov     eax, [ebx+APPDATA.tls_base]

        test    eax, eax

        jz      @F

        push    edx

        stdcall user_alloc, 4096

        pop     edx

        test    eax, eax

        jz      .failed1;eax=0

@@:

        mov     [edx+APPDATA.tls_base], eax

        lea     eax, [app_cmdline]

        stdcall set_app_params , [slot], eax, dword 0, \

                dword 0, [flags]

        mov     eax, [process_number]           ;set result

        call    unlock_application_table

        ret

.failed:

        xor     eax, eax

.failed1:

        call    unlock_application_table

        dec     eax     ;-1

        ret

endp

align 4

tls_app_entry:

        call    init_heap

        stdcall user_alloc, 4096

        mov     edx, [current_slot]

        mov     [edx+APPDATA.tls_base], eax

        mov     [tls_data_l+2], ax

        shr     eax, 16

        mov     [tls_data_l+4], al

        mov     [tls_data_l+7], ah

        mov     dx, app_tls

        mov     fs, dx

        popad

        iretd

EFL_IF      equ 0x0200

EFL_IOPL1   equ 0x1000

EFL_IOPL2   equ 0x2000

EFL_IOPL3   equ 0x3000

align 4

proc set_app_params stdcall,slot:dword, params:dword,\

            cmd_line:dword, app_path:dword, flags:dword

       locals

         pl0_stack dd ?

       endl

        stdcall kernel_alloc, RING0_STACK_SIZE+512

        mov     [pl0_stack], eax

        lea     edi, [eax+RING0_STACK_SIZE]

        mov     eax, [slot]

        mov     ebx, eax

        shl     eax, 8

        mov     [eax+SLOT_BASE+APPDATA.fpu_state], edi

        mov     [eax+SLOT_BASE+APPDATA.exc_handler], 0

        mov     [eax+SLOT_BASE+APPDATA.except_mask], 0

        mov     [eax+SLOT_BASE+APPDATA.terminate_protection], 80000001h

;set default io permission map

        mov     ecx, [SLOT_BASE+256+APPDATA.io_map]

        mov     [eax+SLOT_BASE+APPDATA.io_map], ecx

        mov     ecx, [SLOT_BASE+256+APPDATA.io_map+4]

        mov     [eax+SLOT_BASE+APPDATA.io_map+4], ecx

        mov     esi, fpu_data

        mov     ecx, 512/4

        rep movsd

        cmp     ebx, [TASK_COUNT]

        jle     .noinc

        inc     dword [TASK_COUNT]     ;update number of processes

.noinc:

        shl     ebx, 8

        lea     edx, [ebx+SLOT_BASE+APP_EV_OFFSET]

        mov     [SLOT_BASE+APPDATA.fd_ev+ebx], edx

        mov     [SLOT_BASE+APPDATA.bk_ev+ebx], edx

        add     edx, APP_OBJ_OFFSET-APP_EV_OFFSET

        mov     [SLOT_BASE+APPDATA.fd_obj+ebx], edx

        mov     [SLOT_BASE+APPDATA.bk_obj+ebx], edx

        mov     ecx, [def_cursor]

        mov     [SLOT_BASE+APPDATA.cursor+ebx], ecx

        mov     eax, [pl0_stack]

        mov     [SLOT_BASE+APPDATA.pl0_stack+ebx], eax

        add     eax, RING0_STACK_SIZE

        mov     [SLOT_BASE+APPDATA.saved_esp0+ebx], eax

        push    ebx

        stdcall kernel_alloc, 0x1000

        pop     ebx

        mov     esi, [current_slot]

        mov     esi, [esi+APPDATA.cur_dir]

        mov     ecx, 0x1000/4

        mov     edi, eax

        mov     [ebx+SLOT_BASE+APPDATA.cur_dir], eax

        rep movsd

        shr     ebx, 3

        mov     eax, new_app_base

        mov     dword [CURRENT_TASK+ebx+0x10], eax

.add_command_line:

        mov     edx, [params]

        mov     edx, [edx] ;app_cmdline

        test    edx, edx

        jz      @f     ;application doesn't need parameters

        mov     eax, edx

        add     eax, 256

        jc      @f

;        cmp     eax, [SLOT_BASE+APPDATA.mem_size+ebx*8]

;        ja      @f

        mov     eax, [cmd_line]

        cmp     [edx], dword 0xffffffff ; extended destination tag

        jne     .no_ext_dest

        mov     edx, [edx+4] ; extended destination for cmdline

        jmp     .continue

.no_ext_dest:

        mov     [eax-12], dword 255

.continue:

        mov     byte [edx], 0  ;force empty string if no cmdline given

        test    eax, eax

        jz      @f

;--------------------------------------

        cmp     [eax-4], dword 0xffffffff ; cmdline_flag

        jne     .old_copy

        push    eax

        stdcall strncpy, edx, [eax-8], [eax-12]

        pop     eax