musl/crt/x86_64/crt1.s

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/* Written 2011 Nicholas J. Kain, released as Public Domain */
.weak _init
.weak _fini
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.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 */
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mov $main,%rdi /* 1st arg: application entry ip */
call __libc_start_main /* musl init will run the program */
1: jmp 1b