How does strace distinguishes between syscall-exit-stop or syscall-enter-stop in ARM LINUX ?

Tue Aug 4 05:13:17 UTC 2020

I didn't find the piece of code in strace that distinguishes when using PTRACE_SYSCALL if the state is syscall-exit-stop or syscall-enter-stop in ARM LINUX .

If it is new kenel we can use PTRACE_GET_SYSCALL_INFO , but how does strace find that information out if it is older kernel?
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