gcc assembly question on Mac

Discussion in 'General Mac Discussion' started by chrislee8, Aug 5, 2004.

  1. chrislee8 macrumors regular

    Jul 26, 2004
    NY, NY
    .data                       ; section declaration - variables only
      .ascii    "Hello, world!\n\0"
      len = . - msg		    ; length of our dear string
    .text                       ; section declaration - begin code
      .globl _main
    # write our string to stdout
      li      r0, 4         ; syscall number (sys_write)
      li      r3, 1         ; first argument: file descriptor (stdout)
    			; second argument: pointer to message to write
      lis     r4, ha16(msg); load top 16 bits of &msg
      addi    r4, r4,lo16(msg)   ; load bottom 16 bits
      li      r5, len       ; third argument: message length
      sc			; call kernel
    # and exit
      li      r0, 1		; syscall number (sys_exit)
      li      r3, 1		; first argument: exit code
      sc			; call kernel
    this is the assembly code, then I do this at the root prompt:
    gcc helloworld.s -o helloworld, it compiles and create the helloworld, i thought the will be executable to run, so I run it, it says helloworld command not found.

    so what the process of having the executable to run and display 'hello world' as my program does?

  2. Santiago macrumors regular

    Jun 14, 2002
    Mountain View, California
    By default, the current directory is not in your path; the file is being created, but the command line doesn't know to look for it there. Under bash, use:

    export PATH=${PATH}:.

    Under tcsh, I think it would be: setenv PATH ${PATH}:.

    If you need to run programs from the current working directory on a regular basis, you should add this line to your shell config files.
  3. chrislee8 thread starter macrumors regular

    Jul 26, 2004
    NY, NY

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