[SCM] GNU Mach branch, master, updated. v1.8-229-g261eb7f

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 261eb7f1ade265bb359609a796715fa06f4d32fd
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sun Nov 29 16:20:21 2020 +0100

    x86: Fix initialization of new threads
    
    fninit does not clear MMX/SSE/AVX registers, so we have to use rstor to
    clear them when starting a new thread. Along the way, we can as well
    just have a default state to be loaded in each new thread.
    
    * i386/include/mach/i386/fp_reg.h (XSAVE_XCOMP_BV_COMPACT): New macro.
    * i386/i386/fpu.h (fp_default_state): New variable declaration.
    * i386/i386/fpu.c (fp_default_state): New variable.
    (MXCSR_DEFAULT, CWD_DEFAULT): New macros.
    (fpu_module_init): Allocate and initialize fp_default_state.
    (fpinit): rstor from fp_default_state instead of setting FPU state by
    hand.
    (fp_load): Copy initial state from fp_default_state instead of setting
    it to 0. This is more future-proof since this is the exact state that we are
    loading in fpinit.
    (fp_state_alloc): fp_state_alloc: Copy initial state from
    fp_default_state.

commit 5dbc6990b16a969e470392abe48e8ff9552780b3
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sun Nov 29 16:10:36 2020 +0100

    x86: Factorize fpu save/restore
    
    * i386/i386/fpu.h (fpu_save, fpu_rstor): New macros.
    (fpu_save_context): Use fpu_save macro.
    * i386/i386/fpu.c (fp_save): Use fpu_save macro.
    (fp_load): Use fpu_rstor macro.

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

Summary of changes:
 i386/i386/fpu.c                 | 136 ++++++++++++++--------------------------
 i386/i386/fpu.h                 |  68 +++++++++++++-------
 i386/include/mach/i386/fp_reg.h |   1 +
 3 files changed, 96 insertions(+), 109 deletions(-)


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