Where does the value returned by the syscalls stored in linux?

Asked Dec 07 '20 at 10:22

Active Dec 07 '20 at 10:22

Viewed 17 times

_start:
    mov ax, 0x167 ;putting syscall number of socket which is 359
    mov bl, 0x2   ;putting 2 as first argument
    mov cl, 0x1   ;putting 1 as second argument
    xor dx, dx    ;putting 0 as third argument
    int x80       ;calling socket(2,1,0)

Where will the return value of called function be stored or do I need to specify the register or memory address with some instruction?

asked Dec 07 '20 at 10:22

Gaurav Purswani

1

The result is typically returned in `eax`. – Michael Dec 07 '20 at 10:28
The linked duplicate should address your questions. If it does not, please comment with any specific questions you might have. – fuz Dec 07 '20 at 10:38
yes I got my answer dere, the value is returned in eax, thanks! – Gaurav Purswani Dec 07 '20 at 10:47
1

Note that the args are the full 32-bit registers, not just the low 8 or 16 bits. – Peter Cordes Dec 07 '20 at 13:03
yes, I did that to avoid null bytes in opcode. – Gaurav Purswani Dec 08 '20 at 04:20

Where does the value returned by the syscalls stored in linux?

0 Answers0