// generate kernel call sys_exit(123);
关于系统调用syscall的系统调用号索引可以查看这里
https://elixir.bootlin.com/linux...STP X22, X21, [SP,#0x40+var_30]
STP X20, X19, [SP,#0x40+var_20]
STP X29, X30, [SP,#0x40..., X29, #0x30
LDP X29, X30, [SP,#0x150+var_120]
LDP X20, X19, [SP,#0x150+var_130]
LDP X22...Aarch64 Register and Instruction Quick Start
ARM The Architecture for the Digital World
浅析基于ARM的Linux