/* Written 2011 Nicholas J. Kain, released as Public Domain */ .weak _init .weak _fini .text .global _start _start: xor %rbp,%rbp /* rbp:undefined -> mark as zero 0 (ABI) */ mov %rdx,%r9 /* 6th arg: ptr to register with atexit() */ pop %rsi /* 2nd arg: argc */ mov %rsp,%rdx /* 3rd arg: argv */ andq $-16,%rsp /* align stack pointer */ mov $_fini,%r8 /* 5th arg: fini/dtors function */ mov $_init,%rcx /* 4th arg: init/ctors function */ mov $main,%rdi /* 1st arg: application entry ip */ call __libc_start_main /* musl init will run the program */ 1: jmp 1b