[SCM] GNU Mach branch, master, updated. v1.8-482-g8ddf8e99

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 8ddf8e991c0d271d2681627fab08e6730ae73ae0
Author: Luca Dariz <luca@orpolo.org>
Date:   Mon Jan 16 11:58:52 2023 +0100

    x86_64: expand and shrink messages in copy{in, out}msg routines
    
    * i386/i386/copy_user.h: new file to handle 32/64 bit differences
      - add msg_usize() to recontruct the user-space message size
      - add copyin/copyout helpers for addresses and ports
    * include/mach/message.h: add msg alignment macros
    * ipc/ipc_kmsg.c:
      - copyin/out ports names instead of using pointer magic
    * ipc/ipc_mqueue.c: use msg_usize() to check if we can actually
      receive the message
    * ipc/mach_msg.c: Likewise for continuations in receive path
    * x86_64/Makefrag.am: add x86_64/copy_user.c
    * x86_64/copy_user.c: new file to handle message expansion and
      shrinking during copyinmsg/copyoutmsg for 64 bit kernels.
      - port names -> port pointers on all 64-bit builds
      - 32-bit pointer -> 64 bit pointer when using 32-bit userspace
    * x86_64/locore.S: remove copyinmsg() and copyoutmsg()
    Message-Id: <20230116105857.240210-3-luca@orpolo.org>

commit cc05ed085b731232a2436efcaf03aa1e92ad20be
Author: Luca Dariz <luca@orpolo.org>
Date:   Mon Jan 16 11:58:51 2023 +0100

    add msg_user_header_t for user-side msg structure
    
    * include/mach/message.h: use mach_msg_user_header_t only in KERNEL,
      and define it as mach_msh_header_t for user space
    * ipc/ipc_kmsg.c: use mach_msg_user_header_t where appropriate
    * ipc/ipc_kmsg.h: Likewise
    * ipc/mach_msg.c: Likewise
    * ipc/mach_msg.h: Likewise
    * kern/thread.h: Likewise
    Message-Id: <20230116105857.240210-2-luca@orpolo.org>

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

Summary of changes:
 i386/i386/copy_user.h  | 102 ++++++++++++++
 include/mach/message.h |  31 ++++-
 ipc/ipc_kmsg.c         |  53 +++++---
 ipc/ipc_kmsg.h         |   4 +-
 ipc/ipc_mqueue.c       |   5 +-
 ipc/mach_msg.c         |  27 ++--
 ipc/mach_msg.h         |   4 +-
 kern/thread.h          |   2 +-
 x86_64/Makefrag.am     |   1 +
 x86_64/copy_user.c     | 362 +++++++++++++++++++++++++++++++++++++++++++++++++
 x86_64/locore.S        |  81 -----------
 11 files changed, 551 insertions(+), 121 deletions(-)
 create mode 100644 i386/i386/copy_user.h
 create mode 100644 x86_64/copy_user.c


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