syscall and sysret is pair, but why did I only get syscall, no sysret?

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I run a guest (xubuntu14_x64) on Xen-4.1.4. I want to intercept all system calls of the guest. but I only geot SYSCALL, not a SYSRET. do linux use IRET to replace SYSRET?

asked 1 min ago

yandong

1

syscall and sysret is pair, but why did I only get syscall, no sysret?