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|
; $Id$
;; @file
; IPRT - No-CRT feupdateenv - AMD64 & X86.
;
;
; Copyright (C) 2022 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.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
%define RT_ASM_WITH_SEH64
%include "iprt/asmdefs.mac"
%include "iprt/x86.mac"
BEGINCODE
extern NAME(RT_NOCRT(fesetenv))
extern NAME(RT_NOCRT(feraiseexcept))
;;
; Updates the FPU+SSE environment.
;
; This will restore @a pEnv and merge in pending exception flags.
;
; @returns eax = 0 on success, -1 on failure.
; @param pEnv 32-bit: [xBP+8] msc64: rcx gcc64: rdi - Saved environment.
;
RT_NOCRT_BEGINPROC feupdateenv
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
sub xSP, 30h
SEH64_ALLOCATE_STACK 30h
SEH64_END_PROLOGUE
;
; Load the parameter into rcx.
;
%ifdef ASM_CALL64_GCC
mov rcx, rdi
%elifdef RT_ARCH_X86
mov ecx, [xBP + xCB*2]
%endif
;
; Save the pending exceptions.
;
%ifdef RT_ARCH_X86
extern NAME(rtNoCrtHasSse)
call NAME(rtNoCrtHasSse) ; Preserves all except xAX.
xor edx, edx
test al, al
jz .no_sse
%endif
stmxcsr [xBP - 10h]
mov edx, [xBP - 10h]
and edx, X86_MXCSR_XCPT_FLAGS
.no_sse:
fnstsw ax
or edx, eax
mov [xBP - 8h], edx ; save the pending exceptions here (will apply X86_FSW_XCPT_MASK later).
;
; Call fesetenv to update the environment.
; Note! We have not yet modified the parameter registers for calling
; convensions using them. So, parameters only needs to be loaded
; for the stacked based convention.
;
%ifdef RT_ARCH_X86
mov [xSP], ecx
%endif
call NAME(RT_NOCRT(fesetenv))
;
; Raise exceptions if any are pending.
;
%ifdef ASM_CALL64_GCC
mov edi, [xBP - 8h]
and edi, X86_FSW_XCPT_MASK
%elifdef ASM_CALL64_MSC
mov ecx, [xBP - 8h]
and ecx, X86_FSW_XCPT_MASK
%else
mov ecx, [xBP - 8h]
and ecx, X86_FSW_XCPT_MASK
mov [xSP], ecx
%endif
jz .no_exceptions_to_raise
call NAME(RT_NOCRT(feraiseexcept))
.no_exceptions_to_raise:
;
; Return success.
;
xor eax, eax
leave
ret
ENDPROC RT_NOCRT(feupdateenv)
|
