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Diffstat (limited to 'src/VBox/Runtime/common/math/fesetenv.asm')
| -rw-r--r-- | src/VBox/Runtime/common/math/fesetenv.asm | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/math/fesetenv.asm b/src/VBox/Runtime/common/math/fesetenv.asm new file mode 100644 index 00000000..394d3fce --- /dev/null +++ b/src/VBox/Runtime/common/math/fesetenv.asm @@ -0,0 +1,194 @@ +; $Id: fesetenv.asm $ +;; @file +; IPRT - No-CRT fesetenv - AMD64 & X86. +; + +; +; Copyright (C) 2022-2023 Oracle and/or its affiliates. +; +; This file is part of VirtualBox base platform packages, as +; available from https://www.virtualbox.org. +; +; This program is free software; you can redistribute it and/or +; modify it under the terms of the GNU General Public License +; as published by the Free Software Foundation, in version 3 of the +; License. +; +; This program is distributed in the hope that it will be useful, but +; WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +; General Public License for more details. +; +; You should have received a copy of the GNU General Public License +; along with this program; if not, see <https://www.gnu.org/licenses>. +; +; The contents of this file may alternatively be used under the terms +; of the Common Development and Distribution License Version 1.0 +; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included +; in the VirtualBox 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. +; +; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 +; + + +%define RT_ASM_WITH_SEH64 +%include "iprt/asmdefs.mac" +%include "iprt/x86.mac" + +%define RT_NOCRT_FE_DFL_ENV 1 +%define RT_NOCRT_FE_NOMASK_ENV 2 +%define RT_NOCRT_FE_PC53_ENV 3 +%define RT_NOCRT_FE_PC64_ENV 4 +%define RT_NOCRT_FE_LAST_ENV 4 + + +BEGINCODE + +;; +; Sets the FPU+SSE environment. +; +; @returns eax = 0 on success, -1 on failure. +; @param pEnv 32-bit: [xBP+8] msc64: rcx gcc64: rdi - Saved environment to restore. +; +RT_NOCRT_BEGINPROC fesetenv + push xBP + SEH64_PUSH_xBP + mov xBP, xSP + SEH64_SET_FRAME_xBP 0 + sub xBP, 20h + SEH64_ALLOCATE_STACK 20h + 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 + + ; + ; For the x87 state we only set FSW.XCPT, FCW.XCPT, FCW.RC and FCW.PC. + ; So we save the current environment, merge those fields and load it. + ; + fnstenv [xBP - 20h] + + ; Check for special "pointer" values: + cmp xCX, RT_NOCRT_FE_LAST_ENV + ja .x87_regular + + or eax, -1 + test xCX, xCX + jnz .x87_special +%ifdef RT_STRICT + int3 +%endif + jmp .return + + ; + ; Special x87 state. Clear all pending exceptions. + ; + ; We have 4 special environments with only some differences in FCW differs, so set + ; up FCW in AX, starting with a NOMASK environment as it has the fewest bits set. + ; +.x87_special: + and word [xBP - 20h + X86FSTENV32P.FSW], ~X86_FSW_XCPT_ES_MASK + mov ax, [xBP - 20h + X86FSTENV32P.FCW] + and ax, ~(X86_FCW_MASK_ALL | X86_FCW_PC_MASK | X86_FCW_RC_MASK | X86_FCW_IC_MASK) +%ifdef RT_OS_WINDOWS + or ax, X86_FCW_DM | X86_FCW_PC_53 | X86_FCW_RC_NEAREST | X86_FCW_IC_PROJECTIVE +%else + or ax, X86_FCW_DM | X86_FCW_PC_64 | X86_FCW_RC_NEAREST | X86_FCW_IC_PROJECTIVE +%endif + cmp xCX, RT_NOCRT_FE_NOMASK_ENV + je .x87_special_done + or ax, X86_FCW_MASK_ALL + +%ifdef RT_OS_WINDOWS + cmp xCX, RT_NOCRT_FE_PC64_ENV + jne .x87_special_done + or ax, X86_FCW_PC_64 ; X86_FCW_PC_64 is a super set of X86_FCW_PC_53, so no need to clear bits +%else + cmp xCX, RT_NOCRT_FE_PC53_ENV + jne .x87_special_done + and ax, X86_FCW_PC_64 & ~X86_FCW_PC_53 ; X86_FCW_PC_64 is a super set of X86_FCW_PC_53, so clear the bit that differs. +%endif + +.x87_special_done: + mov [xBP - 20h + X86FSTENV32P.FCW], ax + jmp .x87_common + + ; + ; Merge input and current. + ; +.x87_regular: + ; FCW: + mov ax, [xCX + X86FSTENV32P.FCW] + mov dx, [xBP - 20h + X86FSTENV32P.FCW] + and ax, X86_FCW_MASK_ALL | X86_FCW_RC_MASK | X86_FCW_PC_MASK + and dx, ~(X86_FCW_MASK_ALL | X86_FCW_RC_MASK | X86_FCW_PC_MASK) + or dx, ax + mov [xBP - 20h + X86FSTENV32P.FCW], dx + ; FSW + mov ax, [xCX + X86FSTENV32P.FSW] + mov dx, [xBP - 20h + X86FSTENV32P.FSW] + and ax, X86_FSW_XCPT_MASK + and dx, ~(X86_FSW_XCPT_MASK) + or dx, ax + mov [xBP - 20h + X86FSTENV32P.FSW], dx + +.x87_common: + ; Clear the exception info. + xor eax, eax + mov [xBP - 20h + X86FSTENV32P.FPUIP], eax + mov [xBP - 20h + X86FSTENV32P.FPUCS], eax ; covers FOP too. + mov [xBP - 20h + X86FSTENV32P.FPUDP], eax + mov [xBP - 20h + X86FSTENV32P.FPUDS], eax + + ; Load the merged and cleaned up environment. + fldenv [xBP - 20h] + + + ; + ; Now for SSE, if supported, where we'll restore everything as is. + ; +%ifdef RT_ARCH_X86 + ; SSE supported (ecx preserved)? + extern NAME(rtNoCrtHasSse) + call NAME(rtNoCrtHasSse) + test al, al + jz .return_okay +%endif + + cmp xCX, RT_NOCRT_FE_LAST_ENV + jb .sse_special_env + ldmxcsr [xCX + 28] + jmp .return_okay + +.sse_special_env: + stmxcsr [xBP - 10h] + mov eax, [xBP - 10h] + and eax, ~(X86_MXCSR_XCPT_FLAGS | X86_MXCSR_XCPT_MASK | X86_MXCSR_RC_MASK | X86_MXCSR_DAZ | X86_MXCSR_FZ) + or eax, X86_MXCSR_RC_NEAREST | X86_MXCSR_DM + cmp xCX, RT_NOCRT_FE_NOMASK_ENV ; Only the NOMASK one differs here. + je .sse_special_load_eax + or eax, X86_MXCSR_RC_NEAREST | X86_MXCSR_XCPT_MASK ; default environment masks all exceptions +.sse_special_load_eax: + mov [xBP - 10h], eax + ldmxcsr [xBP - 10h] + + ; + ; Return success. + ; +.return_okay: + xor eax, eax +.return: + leave + ret +ENDPROC RT_NOCRT(fesetenv) + |