Linux 系统调用

user space

entry_SYSCALL_64

1

do_syscall_64

c libraries

write

%rdi = 1 (fd)

struct pt_regs (save context / args)

syscall

applications

kernel

MSR

hardware

__x64_sys_write

0

sys_call_table

wenfh2020.com

%rdx = 11 (strlen(\"hello world\"))

%rsi = 0x4005e0 (\"hello world\")

sysretq

%rax = 1 (system call number)