Question

I have never encounted this error on my old linux machine(both are intel 32bit) so I am at a loss.

I am trying to assemble and link assembly code (which is very simplistic and should work) but ld is giving the error

rs.o: In function `_start':
(.text+0x11): undefined reference to `eax'

the line in question is the pushl %eax line. I only need to push a single byte of 0 to the stack so I decided to use the xor’d eax register. but pushb gives me an “invalid suffix or operands for push” error while assembling with as using the code pushb %al and if I try to use pushl %eax as assembles fine but the linker yells at me.

here is the code.

.section .data

.section .text

.global _start

_start:

xorl %eax, %eax

#sys_socketcall(int call, __user *args)
#sys_socket(int domain, int type, int protocol)

pushl %eax          #protocol: 0
pushl $1            #type: SOCK_STREAM
pushl $2            #domain: AF_INET
movL $1, %ebx       #sys_socket
movl $102, %eax    #sys_socketcall
int $0x80

movl $eax, %ebx  #move socket fd to check echo $?
movl $1, %eax    #exit
int $0x80

any help is appreciated.

Answer 1

You have an error in your assembly: $eax should be %eax in

movl $eax, %ebx  #move socket fd to check echo $?