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Re: [PATCH 1/2] x86-64/setcontext: Pop the pointer into %rdx after syscall

From: Florian Weimer <fweimer at redhat dot com>
To: "H.J. Lu" <hjl dot tools at gmail dot com>, GNU C Library <libc-alpha at sourceware dot org>
Date: Sun, 29 Apr 2018 23:03:33 +0200
Subject: Re: [PATCH 1/2] x86-64/setcontext: Pop the pointer into %rdx after syscall
References: <20180426121700.GA30766@intel.com>

On 04/26/2018 02:17 PM, H.J. Lu wrote:

+	/* Pop the pointer into RDX which is preserved by the syscall.  */
+	popq	%rdx

Sorry, the comment is a bit unclear. Why do you need to restore %rdx ifit is preserved by the system call? Maybe it becomes clearer with afuture change?


Thanks,
Florian

Follow-Ups:
- Re: [PATCH 1/2] x86-64/setcontext: Pop the pointer into %rdx after syscall
  - From: H.J. Lu

References:
- [PATCH 1/2] x86-64/setcontext: Pop the pointer into %rdx after syscall
  - From: H.J. Lu

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