[SCM] GNU Mach branch, master, updated. v1.8-596-gdac167f0

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit dac167f036465e9d7cca10c52d8345773d2e6c3f
Author: Flavio Cruz <flaviocruz@gmail.com>
Date:   Sun Feb 19 18:06:51 2023 -0500

    Support alignment requirements for a 64 bit kernel.
    
    We introduce both a user alignment and a kernel alignment. These are
    separate requirements since for 64 bit with a 32 bit kernel we need to
    ensure the kernel can consume messages that are 8-byte aligned. This
    change removes any possibility of undefined behavior and also allows the
    kernel to support 64 bit RPCs for the userland.
    
    A lot of the code that performs alignment was simplified under the
    assumption that the message headers are well aligned. To enforce that
    going forward, a few static assertions were added.
    Message-Id: <Y/KrixiC9Njmu7ef@jupiter.tail36e24.ts.net>

-----------------------------------------------------------------------

Summary of changes:
 include/mach/message.h |  34 ++++++++----
 ipc/ipc_kmsg.c         | 144 +++++++++++++++++++------------------------------
 x86_64/copy_user.c     |  36 ++++++++-----
 3 files changed, 101 insertions(+), 113 deletions(-)


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