; $Id: CPUMR0A.asm 69111 2017-10-17 14:26:02Z vboxsync $ ;; @file ; CPUM - Ring-0 Assembly Routines (supporting HM and IEM). ; ; ; Copyright (C) 2006-2017 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 * ;******************************************************************************* %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. mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0] 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. mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0] 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) 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). ; mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0] 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. mov pXState, [pCpumCpu + CPUMCPU.Guest.pXStateR0] 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) 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