CODEWITHSUNDEEP
linuxassemblyx8632-bit
McCorner
McCorner

Reputation: 123

Assembler x86 without stdlib

I want to read command line arguments when an assembly program is run. Do I have to use sys_read or something else?

I know how to access data using things like scanf. For instance: 

mov eax, 3
mov ebx, 1
mov ecx, msg
mov edx len
int 0x80

What I'm looking for, though, are the command line arguments. When I execute ./a.out 45 23 I want to get access to the '45' for example.

And so, if anybody have a page where the unixstd.h defined... I would be grateful.

Upvotes: 1

Views: 109

Answers (1)

McCorner
McCorner

Reputation: 123

Accessing command line arguments under ELF32 Linux is available through the stack:

mov eax, [esp+8]
mov ebx, [eax]
mov ecx, offset msg
mov [ecx], ebx

Credit to @Jester for his answer in the comments!

Upvotes: 3

Related Questions