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OvmfPkg: Extend VmgExitLib to handle #VE exception
RFC： https://bugzilla.tianocore.org/show_bug.cgi?id=3429 The base VmgExitLib library provides a default limited interface to handle #VE exception. To provide full support, the OVMF version of VmgExitLib is extended to provide full support of #VE handler. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
This commit is contained in:
Min Xu
mergify[bot]
parent
eddcba40b5
commit
daf8f642f3
@ -25,6 +25,8 @@
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VmgExitVcHandler.c
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VmgExitVcHandler.h
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SecVmgExitVcHandler.c
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VmTdExitVeHandler.c
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X64/TdVmcallCpuid.nasm
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[Packages]
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MdePkg/MdePkg.dec
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@ -44,4 +46,3 @@
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupSize
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidSize
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32
OvmfPkg/Library/VmgExitLib/VmTdExitHandler.h
Normal file
32
OvmfPkg/Library/VmgExitLib/VmTdExitHandler.h
Normal file
@ -0,0 +1,32 @@
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/** @file
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Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef VMTD_EXIT_HANDLER_H_
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#define VMTD_EXIT_HANDLER_H_
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#include <Base.h>
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#include <Uefi.h>
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/**
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This function enable the TD guest to request the VMM to emulate CPUID
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operation, especially for non-architectural, CPUID leaves.
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@param[in] Eax Main leaf of the CPUID
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@param[in] Ecx Sub-leaf of the CPUID
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@param[out] Results Returned result of CPUID operation
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@return EFI_SUCCESS
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**/
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EFI_STATUS
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EFIAPI
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TdVmCallCpuid (
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IN UINT64 Eax,
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IN UINT64 Ecx,
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OUT VOID *Results
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);
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#endif
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559
OvmfPkg/Library/VmgExitLib/VmTdExitVeHandler.c
Normal file
559
OvmfPkg/Library/VmgExitLib/VmTdExitVeHandler.c
Normal file
@ -0,0 +1,559 @@
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/** @file
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Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include "VmTdExitHandler.h"
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#include <Library/VmgExitLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <IndustryStandard/Tdx.h>
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#include <IndustryStandard/InstructionParsing.h>
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typedef union {
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struct {
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UINT32 Eax;
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UINT32 Edx;
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} Regs;
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UINT64 Val;
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} MSR_DATA;
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typedef union {
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UINT8 Val;
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struct {
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UINT8 B : 1;
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UINT8 X : 1;
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UINT8 R : 1;
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UINT8 W : 1;
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} Bits;
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} REX;
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typedef union {
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UINT8 Val;
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struct {
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UINT8 Rm : 3;
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UINT8 Reg : 3;
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UINT8 Mod : 2;
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} Bits;
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} MODRM;
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typedef struct {
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UINT64 Regs[4];
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} CPUID_DATA;
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/**
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Handle an CPUID event.
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Use the TDVMCALL instruction to handle cpuid #ve
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@param[in, out] Regs x64 processor context
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@param[in] Veinfo VE Info
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@retval 0 Event handled successfully
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@return New exception value to propagate
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**/
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STATIC
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UINT64
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EFIAPI
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CpuIdExit (
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IN EFI_SYSTEM_CONTEXT_X64 *Regs,
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IN TDCALL_VEINFO_RETURN_DATA *Veinfo
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)
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{
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CPUID_DATA CpuIdData;
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UINT64 Status;
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Status = TdVmCallCpuid (Regs->Rax, Regs->Rcx, &CpuIdData);
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if (Status == 0) {
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Regs->Rax = CpuIdData.Regs[0];
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Regs->Rbx = CpuIdData.Regs[1];
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Regs->Rcx = CpuIdData.Regs[2];
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Regs->Rdx = CpuIdData.Regs[3];
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}
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return Status;
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}
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/**
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Handle an IO event.
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Use the TDVMCALL instruction to handle either an IO read or an IO write.
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@param[in, out] Regs x64 processor context
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@param[in] Veinfo VE Info
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@retval 0 Event handled successfully
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@return New exception value to propagate
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**/
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STATIC
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UINT64
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EFIAPI
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IoExit (
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IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
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IN TDCALL_VEINFO_RETURN_DATA *Veinfo
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)
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{
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BOOLEAN Write;
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UINTN Size;
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UINTN Port;
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UINT64 Val;
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UINT64 RepCnt;
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UINT64 Status;
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Val = 0;
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Write = Veinfo->ExitQualification.Io.Direction ? FALSE : TRUE;
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Size = Veinfo->ExitQualification.Io.Size + 1;
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Port = Veinfo->ExitQualification.Io.Port;
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if (Veinfo->ExitQualification.Io.String) {
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//
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// If REP is set, get rep-cnt from Rcx
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//
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RepCnt = Veinfo->ExitQualification.Io.Rep ? Regs->Rcx : 1;
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while (RepCnt) {
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Val = 0;
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if (Write == TRUE) {
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CopyMem (&Val, (VOID *)Regs->Rsi, Size);
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Regs->Rsi += Size;
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}
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Status = TdVmCall (EXIT_REASON_IO_INSTRUCTION, Size, Write, Port, Val, (Write ? NULL : &Val));
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if (Status != 0) {
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break;
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}
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if (Write == FALSE) {
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CopyMem ((VOID *)Regs->Rdi, &Val, Size);
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Regs->Rdi += Size;
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}
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if (Veinfo->ExitQualification.Io.Rep) {
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Regs->Rcx -= 1;
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}
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RepCnt -= 1;
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}
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} else {
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if (Write == TRUE) {
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CopyMem (&Val, (VOID *)&Regs->Rax, Size);
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}
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Status = TdVmCall (EXIT_REASON_IO_INSTRUCTION, Size, Write, Port, Val, (Write ? NULL : &Val));
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if ((Status == 0) && (Write == FALSE)) {
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CopyMem ((VOID *)&Regs->Rax, &Val, Size);
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}
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}
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return Status;
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}
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/**
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Handle an READ MSR event.
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Use the TDVMCALL instruction to handle msr read
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@param[in, out] Regs x64 processor context
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@param[in] Veinfo VE Info
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@retval 0 Event handled successfully
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@return New exception value to propagate
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**/
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STATIC
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UINT64
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ReadMsrExit (
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IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
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IN TDCALL_VEINFO_RETURN_DATA *Veinfo
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)
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{
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MSR_DATA Data;
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UINT64 Status;
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Status = TdVmCall (EXIT_REASON_MSR_READ, Regs->Rcx, 0, 0, 0, &Data);
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if (Status == 0) {
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Regs->Rax = Data.Regs.Eax;
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Regs->Rdx = Data.Regs.Edx;
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}
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return Status;
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}
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/**
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Handle an WRITE MSR event.
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Use the TDVMCALL instruction to handle msr write
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@param[in, out] Regs x64 processor context
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@param[in] Veinfo VE Info
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@retval 0 Event handled successfully
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@return New exception value to propagate
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**/
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STATIC
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UINT64
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WriteMsrExit (
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IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
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IN TDCALL_VEINFO_RETURN_DATA *Veinfo
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)
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{
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UINT64 Status;
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MSR_DATA Data;
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Data.Regs.Eax = (UINT32)Regs->Rax;
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Data.Regs.Edx = (UINT32)Regs->Rdx;
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Status = TdVmCall (EXIT_REASON_MSR_WRITE, Regs->Rcx, Data.Val, 0, 0, NULL);
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return Status;
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}
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STATIC
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VOID
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EFIAPI
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TdxDecodeInstruction (
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IN UINT8 *Rip
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)
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{
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UINTN i;
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DEBUG ((DEBUG_INFO, "TDX: #TD[EPT] instruction (%p):", Rip));
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for (i = 0; i < 15; i++) {
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DEBUG ((DEBUG_INFO, "%02x:", Rip[i]));
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}
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DEBUG ((DEBUG_INFO, "\n"));
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}
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#define TDX_DECODER_BUG_ON(x) \
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if ((x)) { \
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TdxDecodeInstruction(Rip); \
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TdVmCall(TDVMCALL_HALT, 0, 0, 0, 0, 0); \
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}
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STATIC
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UINT64 *
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EFIAPI
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GetRegFromContext (
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IN EFI_SYSTEM_CONTEXT_X64 *Regs,
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IN UINTN RegIndex
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)
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{
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switch (RegIndex) {
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case 0: return &Regs->Rax;
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break;
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case 1: return &Regs->Rcx;
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break;
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case 2: return &Regs->Rdx;
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break;
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case 3: return &Regs->Rbx;
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break;
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case 4: return &Regs->Rsp;
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break;
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case 5: return &Regs->Rbp;
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break;
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case 6: return &Regs->Rsi;
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break;
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case 7: return &Regs->Rdi;
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break;
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case 8: return &Regs->R8;
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break;
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case 9: return &Regs->R9;
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break;
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case 10: return &Regs->R10;
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break;
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case 11: return &Regs->R11;
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break;
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case 12: return &Regs->R12;
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break;
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case 13: return &Regs->R13;
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break;
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case 14: return &Regs->R14;
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break;
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case 15: return &Regs->R15;
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break;
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}
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return NULL;
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}
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/**
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Handle an MMIO event.
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Use the TDVMCALL instruction to handle either an mmio read or an mmio write.
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@param[in, out] Regs x64 processor context
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@param[in] Veinfo VE Info
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@retval 0 Event handled successfully
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@return New exception value to propagate
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**/
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STATIC
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INTN
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EFIAPI
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MmioExit (
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IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
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IN TDCALL_VEINFO_RETURN_DATA *Veinfo
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)
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{
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UINT64 Status;
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UINT32 MmioSize;
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UINT32 RegSize;
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UINT8 OpCode;
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BOOLEAN SeenRex;
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UINT64 *Reg;
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UINT8 *Rip;
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UINT64 Val;
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UINT32 OpSize;
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MODRM ModRm;
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REX Rex;
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Rip = (UINT8 *)Regs->Rip;
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Val = 0;
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Rex.Val = 0;
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SeenRex = FALSE;
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//
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// Default to 32bit transfer
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//
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OpSize = 4;
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do {
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OpCode = *Rip++;
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if (OpCode == 0x66) {
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OpSize = 2;
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} else if ((OpCode == 0x64) || (OpCode == 0x65) || (OpCode == 0x67)) {
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continue;
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} else if ((OpCode >= 0x40) && (OpCode <= 0x4f)) {
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SeenRex = TRUE;
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Rex.Val = OpCode;
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} else {
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break;
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}
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} while (TRUE);
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//
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// We need to have at least 2 more bytes for this instruction
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//
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TDX_DECODER_BUG_ON (((UINT64)Rip - Regs->Rip) > 13);
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OpCode = *Rip++;
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//
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// Two-byte opecode, get next byte
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//
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if (OpCode == 0x0F) {
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OpCode = *Rip++;
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}
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switch (OpCode) {
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case 0x88:
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case 0x8A:
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case 0xB6:
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MmioSize = 1;
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break;
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case 0xB7:
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MmioSize = 2;
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break;
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default:
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MmioSize = Rex.Bits.W ? 8 : OpSize;
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break;
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}
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/* Punt on AH/BH/CH/DH unless it shows up. */
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ModRm.Val = *Rip++;
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TDX_DECODER_BUG_ON (MmioSize == 1 && ModRm.Bits.Reg > 4 && !SeenRex && OpCode != 0xB6);
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Reg = GetRegFromContext (Regs, ModRm.Bits.Reg | ((int)Rex.Bits.R << 3));
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TDX_DECODER_BUG_ON (!Reg);
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if (ModRm.Bits.Rm == 4) {
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++Rip; /* SIB byte */
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}
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if ((ModRm.Bits.Mod == 2) || ((ModRm.Bits.Mod == 0) && (ModRm.Bits.Rm == 5))) {
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Rip += 4; /* DISP32 */
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} else if (ModRm.Bits.Mod == 1) {
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++Rip; /* DISP8 */
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}
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switch (OpCode) {
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case 0x88:
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case 0x89:
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CopyMem ((void *)&Val, Reg, MmioSize);
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Status = TdVmCall (TDVMCALL_MMIO, MmioSize, 1, Veinfo->GuestPA, Val, 0);
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break;
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case 0xC7:
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CopyMem ((void *)&Val, Rip, OpSize);
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Status = TdVmCall (TDVMCALL_MMIO, MmioSize, 1, Veinfo->GuestPA, Val, 0);
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Rip += OpSize;
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default:
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//
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// 32-bit write registers are zero extended to the full register
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// Hence 'MOVZX r[32/64], r/m16' is
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// hardcoded to reg size 8, and the straight MOV case has a reg
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// size of 8 in the 32-bit read case.
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//
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switch (OpCode) {
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case 0xB6:
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RegSize = Rex.Bits.W ? 8 : OpSize;
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break;
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case 0xB7:
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RegSize = 8;
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break;
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default:
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RegSize = MmioSize == 4 ? 8 : MmioSize;
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break;
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}
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Status = TdVmCall (TDVMCALL_MMIO, MmioSize, 0, Veinfo->GuestPA, 0, &Val);
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if (Status == 0) {
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ZeroMem (Reg, RegSize);
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CopyMem (Reg, (void *)&Val, MmioSize);
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}
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}
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if (Status == 0) {
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TDX_DECODER_BUG_ON (((UINT64)Rip - Regs->Rip) > 15);
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//
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// We change instruction length to reflect true size so handler can
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// bump rip
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//
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Veinfo->ExitInstructionLength = (UINT32)((UINT64)Rip - Regs->Rip);
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}
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return Status;
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}
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/**
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Handle a #VE exception.
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Performs the necessary processing to handle a #VE exception.
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@param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set
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as value to use on error.
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@param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT
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@retval EFI_SUCCESS Exception handled
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@retval EFI_UNSUPPORTED #VE not supported, (new) exception value to
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propagate provided
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@retval EFI_PROTOCOL_ERROR #VE handling failed, (new) exception value to
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propagate provided
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**/
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EFI_STATUS
|
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EFIAPI
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VmTdExitHandleVe (
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IN OUT EFI_EXCEPTION_TYPE *ExceptionType,
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IN OUT EFI_SYSTEM_CONTEXT SystemContext
|
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)
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{
|
||||
UINT64 Status;
|
||||
TD_RETURN_DATA ReturnData;
|
||||
EFI_SYSTEM_CONTEXT_X64 *Regs;
|
||||
|
||||
Regs = SystemContext.SystemContextX64;
|
||||
Status = TdCall (TDCALL_TDGETVEINFO, 0, 0, 0, &ReturnData);
|
||||
ASSERT (Status == 0);
|
||||
if (Status != 0) {
|
||||
DEBUG ((DEBUG_ERROR, "#VE happened. TDGETVEINFO failed with Status = 0x%llx\n", Status));
|
||||
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
|
||||
}
|
||||
|
||||
switch (ReturnData.VeInfo.ExitReason) {
|
||||
case EXIT_REASON_CPUID:
|
||||
Status = CpuIdExit (Regs, &ReturnData.VeInfo);
|
||||
DEBUG ((
|
||||
DEBUG_VERBOSE,
|
||||
"CPUID #VE happened, ExitReasion is %d, ExitQualification = 0x%x.\n",
|
||||
ReturnData.VeInfo.ExitReason,
|
||||
ReturnData.VeInfo.ExitQualification.Val
|
||||
));
|
||||
break;
|
||||
|
||||
case EXIT_REASON_HLT:
|
||||
Status = TdVmCall (EXIT_REASON_HLT, 0, 0, 0, 0, 0);
|
||||
break;
|
||||
|
||||
case EXIT_REASON_IO_INSTRUCTION:
|
||||
Status = IoExit (Regs, &ReturnData.VeInfo);
|
||||
DEBUG ((
|
||||
DEBUG_VERBOSE,
|
||||
"IO_Instruction #VE happened, ExitReasion is %d, ExitQualification = 0x%x.\n",
|
||||
ReturnData.VeInfo.ExitReason,
|
||||
ReturnData.VeInfo.ExitQualification.Val
|
||||
));
|
||||
break;
|
||||
|
||||
case EXIT_REASON_MSR_READ:
|
||||
Status = ReadMsrExit (Regs, &ReturnData.VeInfo);
|
||||
DEBUG ((
|
||||
DEBUG_VERBOSE,
|
||||
"RDMSR #VE happened, ExitReasion is %d, ExitQualification = 0x%x. Regs->Rcx=0x%llx, Status = 0x%llx\n",
|
||||
ReturnData.VeInfo.ExitReason,
|
||||
ReturnData.VeInfo.ExitQualification.Val,
|
||||
Regs->Rcx,
|
||||
Status
|
||||
));
|
||||
break;
|
||||
|
||||
case EXIT_REASON_MSR_WRITE:
|
||||
Status = WriteMsrExit (Regs, &ReturnData.VeInfo);
|
||||
DEBUG ((
|
||||
DEBUG_VERBOSE,
|
||||
"WRMSR #VE happened, ExitReasion is %d, ExitQualification = 0x%x. Regs->Rcx=0x%llx, Status = 0x%llx\n",
|
||||
ReturnData.VeInfo.ExitReason,
|
||||
ReturnData.VeInfo.ExitQualification.Val,
|
||||
Regs->Rcx,
|
||||
Status
|
||||
));
|
||||
break;
|
||||
|
||||
case EXIT_REASON_EPT_VIOLATION:
|
||||
Status = MmioExit (Regs, &ReturnData.VeInfo);
|
||||
DEBUG ((
|
||||
DEBUG_VERBOSE,
|
||||
"MMIO #VE happened, ExitReasion is %d, ExitQualification = 0x%x.\n",
|
||||
ReturnData.VeInfo.ExitReason,
|
||||
ReturnData.VeInfo.ExitQualification.Val
|
||||
));
|
||||
break;
|
||||
|
||||
case EXIT_REASON_VMCALL:
|
||||
case EXIT_REASON_MWAIT_INSTRUCTION:
|
||||
case EXIT_REASON_MONITOR_INSTRUCTION:
|
||||
case EXIT_REASON_WBINVD:
|
||||
case EXIT_REASON_RDPMC:
|
||||
/* Handle as nops. */
|
||||
break;
|
||||
|
||||
default:
|
||||
DEBUG ((
|
||||
DEBUG_ERROR,
|
||||
"Unsupported #VE happened, ExitReason is %d, ExitQualification = 0x%x.\n",
|
||||
ReturnData.VeInfo.ExitReason,
|
||||
ReturnData.VeInfo.ExitQualification.Val
|
||||
));
|
||||
|
||||
ASSERT (FALSE);
|
||||
CpuDeadLoop ();
|
||||
}
|
||||
|
||||
if (Status) {
|
||||
DEBUG ((
|
||||
DEBUG_ERROR,
|
||||
"#VE Error (0x%llx) returned from host, ExitReason is %d, ExitQualification = 0x%x.\n",
|
||||
Status,
|
||||
ReturnData.VeInfo.ExitReason,
|
||||
ReturnData.VeInfo.ExitQualification.Val
|
||||
));
|
||||
|
||||
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
|
||||
}
|
||||
|
||||
SystemContext.SystemContextX64->Rip += ReturnData.VeInfo.ExitInstructionLength;
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
@ -25,6 +25,8 @@
|
||||
VmgExitVcHandler.c
|
||||
VmgExitVcHandler.h
|
||||
PeiDxeVmgExitVcHandler.c
|
||||
VmTdExitVeHandler.c
|
||||
X64/TdVmcallCpuid.nasm
|
||||
|
||||
[Packages]
|
||||
MdePkg/MdePkg.dec
|
||||
|
||||
146
OvmfPkg/Library/VmgExitLib/X64/TdVmcallCpuid.nasm
Normal file
146
OvmfPkg/Library/VmgExitLib/X64/TdVmcallCpuid.nasm
Normal file
@ -0,0 +1,146 @@
|
||||
;------------------------------------------------------------------------------
|
||||
;*
|
||||
;* Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
|
||||
;* SPDX-License-Identifier: BSD-2-Clause-Patent
|
||||
;*
|
||||
;*
|
||||
;------------------------------------------------------------------------------
|
||||
|
||||
DEFAULT REL
|
||||
SECTION .text
|
||||
|
||||
%define TDVMCALL_EXPOSE_REGS_MASK 0xffec
|
||||
%define TDVMCALL 0x0
|
||||
%define EXIT_REASON_CPUID 0xa
|
||||
|
||||
%macro tdcall 0
|
||||
db 0x66,0x0f,0x01,0xcc
|
||||
%endmacro
|
||||
|
||||
%macro tdcall_push_regs 0
|
||||
push rbp
|
||||
mov rbp, rsp
|
||||
push r15
|
||||
push r14
|
||||
push r13
|
||||
push r12
|
||||
push rbx
|
||||
push rsi
|
||||
push rdi
|
||||
%endmacro
|
||||
|
||||
%macro tdcall_pop_regs 0
|
||||
pop rdi
|
||||
pop rsi
|
||||
pop rbx
|
||||
pop r12
|
||||
pop r13
|
||||
pop r14
|
||||
pop r15
|
||||
pop rbp
|
||||
%endmacro
|
||||
|
||||
%define number_of_regs_pushed 8
|
||||
%define number_of_parameters 4
|
||||
|
||||
;
|
||||
; Keep these in sync for push_regs/pop_regs, code below
|
||||
; uses them to find 5th or greater parameters
|
||||
;
|
||||
%define first_variable_on_stack_offset \
|
||||
((number_of_regs_pushed * 8) + (number_of_parameters * 8) + 8)
|
||||
%define second_variable_on_stack_offset \
|
||||
((first_variable_on_stack_offset) + 8)
|
||||
|
||||
%macro tdcall_regs_preamble 2
|
||||
mov rax, %1
|
||||
|
||||
xor rcx, rcx
|
||||
mov ecx, %2
|
||||
|
||||
; R10 = 0 (standard TDVMCALL)
|
||||
|
||||
xor r10d, r10d
|
||||
|
||||
; Zero out unused (for standard TDVMCALL) registers to avoid leaking
|
||||
; secrets to the VMM.
|
||||
|
||||
xor ebx, ebx
|
||||
xor esi, esi
|
||||
xor edi, edi
|
||||
|
||||
xor edx, edx
|
||||
xor ebp, ebp
|
||||
xor r8d, r8d
|
||||
xor r9d, r9d
|
||||
xor r14, r14
|
||||
xor r15, r15
|
||||
%endmacro
|
||||
|
||||
%macro tdcall_regs_postamble 0
|
||||
xor ebx, ebx
|
||||
xor esi, esi
|
||||
xor edi, edi
|
||||
|
||||
xor ecx, ecx
|
||||
xor edx, edx
|
||||
xor r8d, r8d
|
||||
xor r9d, r9d
|
||||
xor r10d, r10d
|
||||
xor r11d, r11d
|
||||
%endmacro
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
; 0 => RAX = TDCALL leaf / TDVMCALL
|
||||
; M => RCX = TDVMCALL register behavior
|
||||
; 0xa => R11 = TDVMCALL function / CPUID
|
||||
; RCX => R12 = p1
|
||||
; RDX => R13 = p2
|
||||
;
|
||||
; UINT64
|
||||
; EFIAPI
|
||||
; TdVmCallCpuid (
|
||||
; UINT64 EaxIn, // Rcx
|
||||
; UINT64 EcxIn, // Rdx
|
||||
; UINT64 *Results // R8
|
||||
; )
|
||||
global ASM_PFX(TdVmCallCpuid)
|
||||
ASM_PFX(TdVmCallCpuid):
|
||||
tdcall_push_regs
|
||||
|
||||
mov r11, EXIT_REASON_CPUID
|
||||
mov r12, rcx
|
||||
mov r13, rdx
|
||||
|
||||
; Save *results pointers
|
||||
push r8
|
||||
|
||||
tdcall_regs_preamble TDVMCALL, TDVMCALL_EXPOSE_REGS_MASK
|
||||
|
||||
tdcall
|
||||
|
||||
; ignore return data if TDCALL reports failure.
|
||||
test rax, rax
|
||||
jnz .no_return_data
|
||||
|
||||
; Propagate TDVMCALL success/failure to return value.
|
||||
mov rax, r10
|
||||
test rax, rax
|
||||
jnz .no_return_data
|
||||
|
||||
; Retrieve *Results
|
||||
pop r8
|
||||
test r8, r8
|
||||
jz .no_return_data
|
||||
; Caller pass in buffer so store results r12-r15 contains eax-edx
|
||||
mov [r8 + 0], r12
|
||||
mov [r8 + 8], r13
|
||||
mov [r8 + 16], r14
|
||||
mov [r8 + 24], r15
|
||||
|
||||
.no_return_data:
|
||||
tdcall_regs_postamble
|
||||
|
||||
tdcall_pop_regs
|
||||
|
||||
ret
|
||||
Loading…
x
Reference in New Issue
Block a user