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flat assembler > MenuetOS > To print on terminal

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C.H.R



Joined: 28 Jul 2017
Posts: 5
Location: Colombia
Hello

Actually I try to make a little dbg on MeOS, (im begginner) at first, I wanna to start a process from terminal. Ez task, but I want to print a number on terminal (processID), after to print buffer or string.

Code:
buffer:
    db "Process launched succesfully", 10,13
    db "PID: ",0
buffer_end:

....
code
....

mov rax, 256           ; syscall to start process
mov rbx, filename
mov rcx, 0
syscall

cmp rax, 0
jnz   errr
mov [debugee_pid], rbx

mov rdx, buffer
mov r8,  buffer_end - buffer
call send_line_to_terminal

    


How to match the buffer and pid. I dont know how to do.
To convert pid to ascii? How to do it ?

Someone that can help me.

Where to search more info about debuggers ?

thanks in advance...Sorry my bad english.
Post 07 Dec 2017, 10:10
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Ville



Joined: 17 Jun 2003
Posts: 210
You need to convert the number one character at a time into a string and then send it to terminal. Just devide the number by ten, add ascii base ( 48 ) to the remainder in dl (rdx), write dl into a position in string, and repeat until there is no integer part left in rax. Then send the string to the terminal. See the DIV instruction.
Post 12 Dec 2017, 17:25
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rugxulo



Joined: 09 Aug 2005
Posts: 2311
Location: Usono (aka, USA)
Programming - System function calls

Quote:

Menuet 64 v1.26.80 system calls

rax : function number
int 0x60 : system call

47 - Display number

47 - Display number

In : rbx - bits 00-07 - 0 - rcx is number
- 1 - rcx is pointer
bits 08-15 - 0 - display decimal
- 1 - display hexadecimal
- 2 - display binary
bits 16-31 - number of digits to display
bits 32-63 - not used
rcx - Number or pointer
rdx - X shl 32 + Y
rsi - Color

Out: -
Post 20 Dec 2017, 22:37
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