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macosassemblyx86-64system-callsgnu-assembler

GNU Assembler (Mac OS X 64-bit): Illegal instruction: 4

I am new to GNU Assembler and I'm trying to execute this piece of code:

.globl _main
_main:
    movl $1, %eax
    movl $0, %ebx
    int $0x80

This programm should exit by the system call exit (1). Compiled it (no warnings):

gcc test.s

But running it gives me the error: Illegal instruction: 4

Thanks for help!

Solution

  • If you're compiling a 64-bit executable, then you should write something like this:

    movq $0x2000001, %rax
movq $0, %rdi
syscall

    Source.