[SCM] GNU Mach branch, master, updated. v1.8-601-g8e5e86fc

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 8e5e86fc13732b60d2e4d14152d92db1f1ae73f9
Author: Flavio Cruz <flaviocruz@gmail.com>
Date:   Tue Mar 7 02:01:13 2023 -0500

    Align mach_msg_type_t and mach_msg_type_long_t with the same alignment as 
uintptr_t.
    
    With this change, any 64 bit code using the IPC subsystem without relying on
    MiG will work without any changes. We have a few examples of this inside 
gnumach but
    also in the Hurd servers. For example, in hurd/console/display.c
    
      typedef struct
      {
        mach_msg_header_t Head;
        mach_msg_type_t ticknoType;
        natural_t tickno;
        mach_msg_type_t changeType;
        file_changed_type_t change;
        mach_msg_type_t startType;
        loff_t start;
        mach_msg_type_t endType;
        loff_t end;
      } Request;
    
    This will now work correctly in 64 bits, without requiring any explicit 
padding.
    
    As a follow up, we can simplify mach_msg_type_long_t so that we
    only need an 8 byte structure where the second field will include the
    number of elements for the long form. This is already included in
    mach_msg_type_t as unused_msgtl_number.
    Message-Id: <ZAbhOfOzsb8qPFs6@jupiter.tail36e24.ts.net>

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

Summary of changes:
 i386/i386/copy_user.h  |   4 +-
 include/mach/message.h |  14 ++--
 x86_64/copy_user.c     | 186 ++++++++++++++++++++++++++++++++++++++-----------
 3 files changed, 156 insertions(+), 48 deletions(-)


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