| 1 | ; $Id: feholdexcept.asm 96205 2022-08-14 23:40:55Z vboxsync $
|
|---|
| 2 | ;; @file
|
|---|
| 3 | ; IPRT - No-CRT feholdexcept - AMD64 & X86.
|
|---|
| 4 | ;
|
|---|
| 5 |
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (C) 2022 Oracle Corporation
|
|---|
| 8 | ;
|
|---|
| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | ; available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | ; General Public License (GPL) as published by the Free Software
|
|---|
| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | ;
|
|---|
| 17 | ; The contents of this file may alternatively be used under the terms
|
|---|
| 18 | ; of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | ; CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | ;
|
|---|
| 23 | ; You may elect to license modified versions of this file under the
|
|---|
| 24 | ; terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | ;
|
|---|
| 26 |
|
|---|
| 27 |
|
|---|
| 28 | %define RT_ASM_WITH_SEH64
|
|---|
| 29 | %include "iprt/asmdefs.mac"
|
|---|
| 30 | %include "iprt/x86.mac"
|
|---|
| 31 |
|
|---|
| 32 |
|
|---|
| 33 | BEGINCODE
|
|---|
| 34 |
|
|---|
| 35 | ;;
|
|---|
| 36 | ; Gets the FPU+SSE environment and disables (masks) all exceptions.
|
|---|
| 37 | ;
|
|---|
| 38 | ; @returns eax = x87 exception mask (X86_FCW_XCPT_MASK)
|
|---|
| 39 | ; @param pEnv 32-bit: [xBP+8] msc64: rcx gcc64: rdi
|
|---|
| 40 | ;
|
|---|
| 41 | RT_NOCRT_BEGINPROC feholdexcept
|
|---|
| 42 | push xBP
|
|---|
| 43 | SEH64_PUSH_xBP
|
|---|
| 44 | mov xBP, xSP
|
|---|
| 45 | SEH64_SET_FRAME_xBP 0
|
|---|
| 46 | SEH64_END_PROLOGUE
|
|---|
| 47 |
|
|---|
| 48 | ;
|
|---|
| 49 | ; Load the parameter into rcx.
|
|---|
| 50 | ;
|
|---|
| 51 | %ifdef ASM_CALL64_GCC
|
|---|
| 52 | mov rcx, rdi
|
|---|
| 53 | %elifdef RT_ARCH_X86
|
|---|
| 54 | mov ecx, [xBP + xCB*2]
|
|---|
| 55 | %endif
|
|---|
| 56 |
|
|---|
| 57 | ;
|
|---|
| 58 | ; Save the FPU environment and MXCSR.
|
|---|
| 59 | ;
|
|---|
| 60 | fnstenv [xCX]
|
|---|
| 61 | mov al, [xCX] ; Save FCW.
|
|---|
| 62 | or byte [xCX], X86_FCW_MASK_ALL
|
|---|
| 63 | fldcw [xCX]
|
|---|
| 64 | mov [xCX], al ; Restore FCW.
|
|---|
| 65 |
|
|---|
| 66 | %ifdef RT_ARCH_X86
|
|---|
| 67 | ; SSE supported (ecx preserved)?
|
|---|
| 68 | and dword [xCX + 28], 0h
|
|---|
| 69 | extern NAME(rtNoCrtHasSse)
|
|---|
| 70 | call NAME(rtNoCrtHasSse)
|
|---|
| 71 | test al, al
|
|---|
| 72 | jz .return_nosse
|
|---|
| 73 | %endif
|
|---|
| 74 | stmxcsr [xCX + 28]
|
|---|
| 75 | mov eax, [xCX + 28] ; Save MXCSR.
|
|---|
| 76 | or dword [xCX + 28], X86_MXCSR_XCPT_MASK
|
|---|
| 77 | ldmxcsr [xCX + 28]
|
|---|
| 78 | mov [xCX + 28], eax ; Restore MXCSR.
|
|---|
| 79 |
|
|---|
| 80 | .return_nosse:
|
|---|
| 81 |
|
|---|
| 82 | ;
|
|---|
| 83 | ; Return success.
|
|---|
| 84 | ;
|
|---|
| 85 | xor eax, eax
|
|---|
| 86 | leave
|
|---|
| 87 | ret
|
|---|
| 88 | ENDPROC RT_NOCRT(feholdexcept)
|
|---|
| 89 |
|
|---|
