Assembly and System Calls

Question

Im having a bit of trouble understanding the more complex system calls in assembly. I wrote a exec system call and it worked great

 .bss

.text

.globl _start

         


        

Answer 1

You don't put strings in a register. You should pass a pointer (the address) to a null (0) terminated string (C style) in the register for this function. Some system calls (like write) take a pointer (not necessarily terminated by '\0') and length in two registers.

# somewhere in the data section:
myString:
   .asciz "/bin/bash"

and pass $myString using the register.