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Date:   Sun, 31 May 2020 12:20:51 -0400
From:   Keno Fischer <>
To:     Dave Martin <>
Cc:     Will Deacon <>,
        Catalin Marinas <>,
        Kyle Huey <>, Oleg Nesterov <>,,
        Linux Kernel Mailing List <>
Subject: Re: arm64: Register modification during syscall entry/exit stop

> Can't PTRACE_SYSEMU be emulated by using PTRACE_SYSCALL, cancelling the
> syscall at the syscall enter stop, then modifying the regs at the
> syscall exit stop?

Yes, it can. The idea behind SYSEMU is to be able to save half the
ptrace traps that would require, in theory making the ptracer
a decent amount faster. That said, the x7 issue is orthogonal to
SYSEMU, you'd have the same issues if you used PTRACE_SYSCALL.


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