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Background and Goals:

I am fairly new to assembly, and even newer to macOS. I am currently hitting an error I don't know how to solve or even how to debug. The goal is to change directory in the parent application. I have found ways to do this in Shell, but it is a bit hacky, and I am hoping to be able to achieve this using Assembly.

I am currently running the assembly code below on Mac Monterey v12.2.

I ran into problems with linker errors before, and ended up following everything on the following link before up where I am now: nasm - Can't link object file with ld on macOS Mojave

Present:

I am getting the error .zsh bus error ./chdirfn.

I am ..

.. compiling using nasm -f macho64 chdirfn.asm ..

.. linking the object file using ld -e start -static chdirfn.o -o chdirfn..

.. running the executable via ./chdirfn

I am curious how I might fix the code AND how I could have figure out what the bus error was on my own?

Code:

; code modified from from querist post on https://stackoverflow.com/questions/35905847/chdir-syscall-in-os-x-assembler
global      start

section     .text

section     .data
  path         db   "/Users/sister/",0x00,0x00

start:
  mov         rax,  0x0200000c
  lea         rdi,  [rel path]
  sub         rsp,  16
  syscall

  mov         rdi,  rax
  mov         rax,  0x02000001
  syscall

Expected Behavior: "cd" into `/Users/sister/

Alephпτ1
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0 Answers0