1.3. Макросы в GAS :
С помощью макросов можно облегчить свою жизнь .
___ test_fopen.s __________________________________________________________
.include "include.asm"
.globl main
main:
_print hallo # Print title
_open bestand mode # Open the file 'dummy.dummy'
cmp $0,%eax # Success?
je file_error # No, Print error message
_close %eax # Yes, Close file
_print bestaat # Print text 'exist'
jmp einde # End of prg.
file_error:
_print bestaat_niet # Print text 'doesn't exist'
einde:
ret # The End ;-)
hallo:
.string "Test Linux Program ;-) \n"
bestaat:
.string "The file dummy.dummy exists..."
bestaat_niet:
.string "The file dummy.dummy doesn't exist..."
bestand:
.string "dummy.dummy"
mode:
.string "r"
.END
___________________________________________________________________________
___ include.asm ___________________________________________________________
.MACRO _print message
# start _print message
pushl $\message
call puts
addl $4,%esp
# end _print message
.ENDM
.MACRO _open file mode
# start _open file mode
pushl %ebp
movl %esp,%ebp
pushl $\mode
pushl $\file
call fopen
addl $8,%esp
movl %eax,-4(%ebp)
# %eax = file-handle
# - if %eax = 0 then the file doesn't exist
# - if %eax >< 0 %eax is the file-handle
popl %ebp
# end _open file mode
.ENDM
.MACRO _close filehandle
# start _close filehandle
pushl \filehandle
call fclose
addl $4,%esp
# end _close filehandle
.ENDM
___________________________________________________________________________
as test_fopen.s -o test_fopen.o
gcc test_fopen.o -o test_fopen
1.4. ncurses
Ncurses - библиотека для написания программ с текстовым
интерфейсом . В данном примере по экрану циклически перемещается
текстовая строка .
___ sat_color.s ___________________________________________________________
.include "/home/jan/assembler/include/ncurses.asm"
.globl main
main:
_initscr
_start_color
_init_pair $1,$2,$4
_init_pair $2,$0,$6
_init_pair $3,$3,$4
_init_pair $4,$4,$4 # Hide the flashing cursor
call cls # clear screen/init colors.
_use_pair $0x00000200 # 00 00(NORMAL) 02(PAIR) 00
_locate $1,$0
_printw $titel
_locate $46,$0
_printw $pd
_use_pair $0x00200100 # 00 20(BOLD) 01(PAIR) 00
_locate $32,$12
_printw $world
_use_pair $0x00200300 # 00 20(BOLD) 03(PAIR) 00
movl $0,%esi
lus:
movb tabel(%esi),%dl # %dl = X(%esi)
incl %esi
movb tabel(%esi),%cl # %cl = Y(%esi)
incl %esi
cmpb $242,%cl
jne n242_1
movl $0,%esi
jmp lus
n242_1:
movl %esi,%edi
redo:
movb tabel(%edi),%dh # %dh = X(%esi + 1)
incl %edi
movb tabel(%edi),%ch # %ch = Y(%esi + 1)
cmpb $242,%ch
jne n242_2
movl $0,%edi
jmp redo
n242_2:
movl $leeg,%ebp
call print_item
movl $linux,%ebp
movb %ch,%cl
movb %dh,%dl
call print_item
pushl $160000 # C : usleep(....);
call usleep # Wacht-lus
addl $4,%esp
_refresh
jmp lus
_endwin
ret
print_item:
pushal
movzbl %cl,%eax
movzbl %dl,%ebx
_locate %ebx,%eax
_printw %ebp
popal
ret
cls:
_use_pair $0x00000200 # 00 00(NORMAL) 02(PAIR) 00
# Color of the first line
movb $0,%cl
movb $0,%dl
cls_lus:
movl $chr32,%ebp
call print_item
incb %dl
cmpb $79,%dl
jna cls_lus
pushal
_use_pair $0x00000400 # 00 00(NORMAL) 04(PAIR) 00
# Color of the rest of the screen
popal
xorb %dl,%dl
incb %cl
cmpb $25,%cl
jna cls_lus
ret
linux:
.string "Linux"
leeg:
.string " "
chr32:
.string " "
world:
.string "World Domination"
titel:
.string "sat_color.s - 1997 Jan Wagemakers -"
pd:
.string "Donated to the Public Domain :-)"
tabel:
.include "cirkel.dat"
.byte 242,242
.END
___________________________________________________________________________
___ cirkel.dat ____________________________________________________________
.byte 72 , 12
.byte 71 , 13
.byte 69 , 15
.byte 66 , 17
.byte 62 , 18
.byte 56 , 20
.byte 51 , 21
.byte 44 , 21
.byte 38 , 21
.byte 31 , 21
.byte 24 , 21
.byte 18 , 20
.byte 13 , 19
.byte 8 , 17
.byte 5 , 16
.byte 3 , 14
.byte 2 , 12
.byte 2 , 10
.byte 3 , 8
.byte 6 , 7
.byte 10 , 5
.byte 15 , 4
.byte 20 , 3
.byte 27 , 2
.byte 33 , 2
.byte 40 , 2
.byte 47 , 2
.byte 53 , 3
.byte 59 , 4
.byte 63 , 5
.byte 67 , 7
.byte 70 , 8
.byte 71 , 10
___________________________________________________________________________
___ /home/jan/assembler/include/ncurses.asm _______________________________
# ncurses.asm - donated to the public domain by Jan Wagemakers -
# afgeleid van onderstaand C-programma
# #include <curses.h>
#
# int main(void)
# {
# initscr(); /* Init the curses libraries */
# move(10, 2); /* Place the cursor at X: 2, Y: 10 */
# printw("Hello, World !"); /* Print anything */
# refresh(); /* This places the "Hello, World !" on the physical screen */
# getch(); /* Wait for keypress */
# endwin(); /* deinit the curses libraries. */
# return 0;
# }
#
# Because I know NOT very much of C The following can be incorrect.
# Please, do not hesitate to make corrections :-)
# So, when you want to put something on the screen with ncurses, you call
# the following macro's :
# 1. _initscr
# 2. _locate x y (x,y = screen coordinates)
# 3. _printw message
# 4. _refresh
# 5. _endwin (end win.... sounds nice, isn't it ;-)
.MACRO _initscr
# start _initscr
call initscr
# end _initscr
.ENDM
.MACRO _locate x y
# start _locate x y
pushl \x
pushl \y
movl stdscr,%eax
pushl %eax
call wmove
addl $12,%esp
# end _locate x y
.ENDM
.MACRO _printw message
# start _print message
pushl \message
call printw
addl $4,%esp
# end _printw message
.ENDM
.MACRO _refresh
# start _refresh
movl stdscr,%eax
pushl %eax
call wrefresh
addl $4,%esp
# end _refresh
.ENDM
.MACRO _endwin
# start _endwin
call endwin
# end _endwin
.ENDM
# Colors and ncurses. (15/07/97)
# - After _initscr , call _start_color
# - Init with _init_pair a color-pair.
# - With _use_pair select a color-pair.
.MACRO _start_color
# start _start_color
call start_color
# end _start_color
.ENDM
.MACRO _init_pair pair foreground background
# start _init_pair
pushl \background
pushl \foreground
pushl \pair
call init_pair
addl $12,%esp
# end _init_pair
.ENDM
.MACRO _use_pair pair
# start _use_pair
movl \pair,%eax
# | | %ah | %al |
# %eax = xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
# | |
# | |
# | +----> Number of color-pair
# +-------------> 00 = Normaal , 20 = BOLD
pushl %eax
movl stdscr,%eax
pushl %eax
call wattr_on
addl $8,%esp
#end _use_pair
.ENDM
___________________________________________________________________________
as sat_color.s -o sat_color.o
gcc sat_color.o -o sat_color -lncurses
sat_color
|
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