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|
; $Id: CPUMR0A.asm $
;; @file
; CPUM - Ring-0 Assembly Routines (supporting HM and IEM).
;
;
; Copyright (C) 2006-2023 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>.
;
; SPDX-License-Identifier: GPL-3.0-only
;
;*******************************************************************************
;* Header Files *
;*******************************************************************************
%define RT_ASM_WITH_SEH64
%include "iprt/asmdefs.mac"
%include "VBox/asmdefs.mac"
%include "VBox/vmm/vm.mac"
%include "VBox/err.mac"
%include "VBox/vmm/stam.mac"
%include "CPUMInternal.mac"
%include "iprt/x86.mac"
%include "VBox/vmm/cpum.mac"
BEGINCODE
;;
; Makes sure the EMTs have a FPU state associated with them on hosts where we're
; allowed to use it in ring-0 too.
;
; This ensure that we don't have to allocate the state lazily while trying to execute
; guest code with preemption disabled or worse.
;
; @cproto VMMR0_INT_DECL(void) CPUMR0RegisterVCpuThread(PVMCPU pVCpu);
;
BEGINPROC CPUMR0RegisterVCpuThread
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
SEH64_END_PROLOGUE
%ifdef VMM_R0_TOUCH_FPU
movdqa xmm0, xmm0 ; hope this is harmless.
%endif
.return:
xor eax, eax ; paranoia
leave
ret
ENDPROC CPUMR0RegisterVCpuThread
%ifdef VMM_R0_TOUCH_FPU
;;
; Touches the host FPU state.
;
; @uses nothing (well, maybe cr0)
;
%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
ALIGNCODE(16)
%endif
BEGINPROC CPUMR0TouchHostFpu
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
SEH64_END_PROLOGUE
movdqa xmm0, xmm0 ; Hope this is harmless.
leave
ret
ENDPROC CPUMR0TouchHostFpu
%endif ; VMM_R0_TOUCH_FPU
;;
; Saves the host FPU/SSE/AVX state and restores the guest FPU/SSE/AVX state.
;
; @returns VINF_SUCCESS (0) or VINF_CPUM_HOST_CR0_MODIFIED. (EAX)
; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
;
; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
; However the compiler docs have different idea:
; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
; We'll go with the former for now.
;
%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
ALIGNCODE(16)
%endif
BEGINPROC cpumR0SaveHostRestoreGuestFPUState
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
SEH64_END_PROLOGUE
;
; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
;
%ifdef RT_ARCH_AMD64
%ifdef RT_OS_WINDOWS
mov r11, rcx
%else
mov r11, rdi
%endif
%define pCpumCpu r11
%define pXState r10
%else
push ebx
push esi
mov ebx, dword [ebp + 8]
%define pCpumCpu ebx
%define pXState esi
%endif
pushf ; The darwin kernel can get upset or upset things if an
cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
;
; Save the host state.
;
test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_HOST
jnz .already_saved_host
CPUMRZ_TOUCH_FPU_CLEAR_CR0_FPU_TRAPS_SET_RC xCX, xAX, pCpumCpu ; xCX is the return value for VT-x; xAX is scratch.
CPUMR0_SAVE_HOST
%ifdef VBOX_WITH_KERNEL_USING_XMM
jmp .load_guest
%endif
.already_saved_host:
%ifdef VBOX_WITH_KERNEL_USING_XMM
; If we didn't save the host state, we must save the non-volatile XMM registers.
lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
stmxcsr [pXState + X86FXSTATE.MXCSR]
movdqa [pXState + X86FXSTATE.xmm6 ], xmm6
movdqa [pXState + X86FXSTATE.xmm7 ], xmm7
movdqa [pXState + X86FXSTATE.xmm8 ], xmm8
movdqa [pXState + X86FXSTATE.xmm9 ], xmm9
movdqa [pXState + X86FXSTATE.xmm10], xmm10
movdqa [pXState + X86FXSTATE.xmm11], xmm11
movdqa [pXState + X86FXSTATE.xmm12], xmm12
movdqa [pXState + X86FXSTATE.xmm13], xmm13
movdqa [pXState + X86FXSTATE.xmm14], xmm14
movdqa [pXState + X86FXSTATE.xmm15], xmm15
;
; Load the guest state.
;
.load_guest:
%endif
CPUMR0_LOAD_GUEST
%ifdef VBOX_WITH_KERNEL_USING_XMM
; Restore the non-volatile xmm registers. ASSUMING 64-bit host.
lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
movdqa xmm6, [pXState + X86FXSTATE.xmm6]
movdqa xmm7, [pXState + X86FXSTATE.xmm7]
movdqa xmm8, [pXState + X86FXSTATE.xmm8]
movdqa xmm9, [pXState + X86FXSTATE.xmm9]
movdqa xmm10, [pXState + X86FXSTATE.xmm10]
movdqa xmm11, [pXState + X86FXSTATE.xmm11]
movdqa xmm12, [pXState + X86FXSTATE.xmm12]
movdqa xmm13, [pXState + X86FXSTATE.xmm13]
movdqa xmm14, [pXState + X86FXSTATE.xmm14]
movdqa xmm15, [pXState + X86FXSTATE.xmm15]
ldmxcsr [pXState + X86FXSTATE.MXCSR]
%endif
or dword [pCpumCpu + CPUMCPU.fUseFlags], (CPUM_USED_FPU_GUEST | CPUM_USED_FPU_SINCE_REM | CPUM_USED_FPU_HOST)
mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 1
popf
mov eax, ecx
.return:
%ifdef RT_ARCH_X86
pop esi
pop ebx
%endif
leave
ret
ENDPROC cpumR0SaveHostRestoreGuestFPUState
;;
; Saves the guest FPU/SSE/AVX state and restores the host FPU/SSE/AVX state.
;
; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
;
; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
; However the compiler docs have different idea:
; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
; We'll go with the former for now.
;
%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
ALIGNCODE(16)
%endif
BEGINPROC cpumR0SaveGuestRestoreHostFPUState
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
SEH64_END_PROLOGUE
;
; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
;
%ifdef RT_ARCH_AMD64
%ifdef RT_OS_WINDOWS
mov r11, rcx
%else
mov r11, rdi
%endif
%define pCpumCpu r11
%define pXState r10
%else
push ebx
push esi
mov ebx, dword [ebp + 8]
%define pCpumCpu ebx
%define pXState esi
%endif
pushf ; The darwin kernel can get upset or upset things if an
cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
%ifdef VBOX_WITH_KERNEL_USING_XMM
;
; Copy non-volatile XMM registers to the host state so we can use
; them while saving the guest state (we've gotta do this anyway).
;
lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
stmxcsr [pXState + X86FXSTATE.MXCSR]
movdqa [pXState + X86FXSTATE.xmm6], xmm6
movdqa [pXState + X86FXSTATE.xmm7], xmm7
movdqa [pXState + X86FXSTATE.xmm8], xmm8
movdqa [pXState + X86FXSTATE.xmm9], xmm9
movdqa [pXState + X86FXSTATE.xmm10], xmm10
movdqa [pXState + X86FXSTATE.xmm11], xmm11
movdqa [pXState + X86FXSTATE.xmm12], xmm12
movdqa [pXState + X86FXSTATE.xmm13], xmm13
movdqa [pXState + X86FXSTATE.xmm14], xmm14
movdqa [pXState + X86FXSTATE.xmm15], xmm15
%endif
;
; Save the guest state if necessary.
;
test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_GUEST
jz .load_only_host
%ifdef VBOX_WITH_KERNEL_USING_XMM
; Load the guest XMM register values we already saved in HMR0VMXStartVMWrapXMM.
lea pXState, [pCpumCpu + CPUMCPU.Guest.XState]
movdqa xmm0, [pXState + X86FXSTATE.xmm0]
movdqa xmm1, [pXState + X86FXSTATE.xmm1]
movdqa xmm2, [pXState + X86FXSTATE.xmm2]
movdqa xmm3, [pXState + X86FXSTATE.xmm3]
movdqa xmm4, [pXState + X86FXSTATE.xmm4]
movdqa xmm5, [pXState + X86FXSTATE.xmm5]
movdqa xmm6, [pXState + X86FXSTATE.xmm6]
movdqa xmm7, [pXState + X86FXSTATE.xmm7]
movdqa xmm8, [pXState + X86FXSTATE.xmm8]
movdqa xmm9, [pXState + X86FXSTATE.xmm9]
movdqa xmm10, [pXState + X86FXSTATE.xmm10]
movdqa xmm11, [pXState + X86FXSTATE.xmm11]
movdqa xmm12, [pXState + X86FXSTATE.xmm12]
movdqa xmm13, [pXState + X86FXSTATE.xmm13]
movdqa xmm14, [pXState + X86FXSTATE.xmm14]
movdqa xmm15, [pXState + X86FXSTATE.xmm15]
ldmxcsr [pXState + X86FXSTATE.MXCSR]
%endif
CPUMR0_SAVE_GUEST
;
; Load the host state.
;
.load_only_host:
CPUMR0_LOAD_HOST
; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
; in cpumRZSaveHostFPUState.
mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
and dword [pCpumCpu + CPUMCPU.fUseFlags], ~(CPUM_USED_FPU_GUEST | CPUM_USED_FPU_HOST)
mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 0
popf
%ifdef RT_ARCH_X86
pop esi
pop ebx
%endif
leave
ret
%undef pCpumCpu
%undef pXState
ENDPROC cpumR0SaveGuestRestoreHostFPUState
%if ARCH_BITS == 32
%ifdef VBOX_WITH_64_BITS_GUESTS
;;
; Restores the host's FPU/SSE/AVX state from pCpumCpu->Host.
;
; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
;
%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
ALIGNCODE(16)
%endif
BEGINPROC cpumR0RestoreHostFPUState
;
; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
;
push ebp
mov ebp, esp
push ebx
push esi
mov ebx, dword [ebp + 8]
%define pCpumCpu ebx
%define pXState esi
;
; Restore host CPU state.
;
pushf ; The darwin kernel can get upset or upset things if an
cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
CPUMR0_LOAD_HOST
; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
; in cpumRZSaveHostFPUState.
;; @todo What about XCR0?
mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
and dword [pCpumCpu + CPUMCPU.fUseFlags], ~CPUM_USED_FPU_HOST
popf
pop esi
pop ebx
leave
ret
%undef pCpumCPu
%undef pXState
ENDPROC cpumR0RestoreHostFPUState
%endif ; VBOX_WITH_64_BITS_GUESTS
%endif ; ARCH_BITS == 32
|
