[SCM] GNU Mach branch, master, updated. v1.8-621-g660bc8ab

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 660bc8ab3813737b3857648b7ec60d88494aeed1
Author: Luca Dariz <luca@orpolo.org>
Date:   Wed Apr 19 21:47:02 2023 +0200

    x86_64: add 64-bit syscall entry point
    
    While theoretically we could still use the same call gate as for
    32-bit userspace, it doesn't seem very common, and gcc seems to not
    encode properly the instruction. Instead we use syscall/sysret as
    other kernels (e.g. XNU,Linux). This version still has some
    limitations, but should be enough to start working on the 64-bit user
    space.
    
    * i386/i386/i386asm.sym: add more constants to fill pcb->iss
    * i386/i386/ldt.c: configure 64-bit syscall entry point. We can just
      check for the SEP bit as MSR are always available on x86_64.
    * i386/i386/ldt.h: swap CS/DS segments order if !USER32 as required by
      sysret
    * i386/i386/locore.h: add syscall64 prototype
    * i386/i386/msr.h: add MSR definitions and C read/write helpers
    * i386/include/mach/i386/syscall_sw.h: remove old BSD_TRAP
    * x86_64/Makefrag.am: selectively install syscall_sw.h depending on
      USER32
    * x86_64/include/syscall_sw.h: add entry point template from user
      space
    * x86_64/locore.S: implement syscall64 entry point and use it when a
      64-bit user-space is configured
    Message-Id: <20230419194703.410575-4-luca@orpolo.org>

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

Summary of changes:
 i386/i386/i386asm.sym                              |  15 ++
 i386/i386/ldt.c                                    |  16 ++-
 i386/i386/ldt.h                                    |   9 +-
 i386/i386/locore.h                                 |   1 +
 i386/i386/msr.h                                    |  56 ++++++++
 i386/include/mach/i386/syscall_sw.h                |  12 +-
 x86_64/Makefrag.am                                 |   7 +-
 .../mach/policy.h => x86_64/include/syscall_sw.h   |  27 ++--
 x86_64/locore.S                                    | 158 ++++++++++++++++++++-
 9 files changed, 265 insertions(+), 36 deletions(-)
 create mode 100644 i386/i386/msr.h
 copy include/mach/policy.h => x86_64/include/syscall_sw.h (74%)


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