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; $Id: tstX86-FpuSaveRestoreA.asm $
;; @file
; tstX86-FpuSaveRestore - Experimenting with saving and restoring FPU, assembly bits.
;
;
; Copyright (C) 2013-2020 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
;*******************************************************************************
;* Header Files *
;*******************************************************************************
%include "iprt/asmdefs.mac"
%include "iprt/x86.mac"
;*******************************************************************************
;* Global Variables *
;*******************************************************************************
BEGINCODE
g_r80_Zero: dt 0.0
g_r80_One: dt 1.0
BEGINCODE
;; Prepares a FPU exception.
BEGINPROC MyFpuPrepXcpt
fld tword [g_r80_One xWrtRIP]
fld tword [g_r80_Zero xWrtRIP]
fdiv st0
ret
ENDPROC MyFpuPrepXcpt
;; Same as above, just different address.
BEGINPROC MyFpuPrepXcpt2
fld tword [g_r80_One xWrtRIP]
fld tword [g_r80_Zero xWrtRIP]
fdiv st0
ret
ENDPROC MyFpuPrepXcpt2
BEGINPROC MyFpuSave
%ifdef ASM_CALL64_MSC
o64 fxsave [rcx]
%elifdef ASM_CALL64_GCC
o64 fxsave [rdi]
%elifdef RT_ARCH_X86
mov ecx, [esp + 4]
fxsave [ecx]
%else
%error "Unsupported architecture."
bad arch
%endif
ret
ENDPROC MyFpuSave
BEGINPROC MyFpuStoreEnv
%ifdef ASM_CALL64_MSC
fstenv [rcx]
%elifdef ASM_CALL64_GCC
fstenv [rdi]
%elifdef RT_ARCH_X86
mov ecx, [esp + 4]
fstenv [ecx]
%else
%error "Unsupported architecture."
bad arch
%endif
ret
ENDPROC MyFpuStoreEnv
BEGINPROC MyFpuRestore
%ifdef ASM_CALL64_MSC
o64 fxrstor [rcx]
%elifdef ASM_CALL64_GCC
o64 fxrstor [rdi]
%elifdef RT_ARCH_X86
mov ecx, [esp + 4]
fxrstor [ecx]
%else
%error "Unsupported architecture."
bad arch
%endif
ret
ENDPROC MyFpuRestore
BEGINPROC MyFpuLoadEnv
%ifdef ASM_CALL64_MSC
fldenv [rcx]
%elifdef ASM_CALL64_GCC
fldenv [rdi]
%elifdef RT_ARCH_X86
mov ecx, [esp + 4]
fldenv [ecx]
%else
%error "Unsupported architecture."
bad arch
%endif
ret
ENDPROC MyFpuLoadEnv
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