[SCM] GNU Mach branch, master, updated. v1.8-760-g25ece371

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 25ece371fb21dfd874187f623593064c476d9ca2
Author: Flavio Cruz <flaviocruz@gmail.com>
Date:   Tue Jun 13 00:01:25 2023 -0400

    Update the 64bit RPC ABI to be simpler
    
    * Make full use of the 8 bytes available in mach_msg_type_t by moving
      into the unused 4 bytes. This allows us to use 32bits for
      mach_msg_type_number_t whether we use the longform or not.
    * Make mach_msg_type_long_t exactly the same as mach_msg_type_t.
      Updating MiG is strongly encouraged since it will generate better code
      to handle this new format.
    
    After this change, any compatibility with compiled binaries for Hurd x86_64
    will break since the message format is different. However, the new
    schema simplifies the overall ABI, without having "holes" and also
    avoids the need to have a 16 byte mach_msg_type_long_t.
    
    Was able to boot a basic system up to a bash shell.
    Message-Id: <ZIfqFe5bPNPeH4xg@jupiter.lan>

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

Summary of changes:
 include/mach/message.h | 52 ++++++++++++++++++++++++++---
 ipc/ipc_kmsg.c         |  4 +++
 x86_64/copy_user.c     | 88 +++++++++++++++++++++++++++++++++++++++++---------
 3 files changed, 123 insertions(+), 21 deletions(-)


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