138 lines
4.0 KiB
ArmAsm
138 lines
4.0 KiB
ArmAsm
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/*-
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* Copyright (c) 2013, Anish Gupta (akgupt3@gmail.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asmacros.h>
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#include "svm_assym.s"
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/*
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* Macros to save and restore GPRs.
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*/
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#define SAVE_GPR_STATE(reg); \
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movq %rbp, SCTX_RBP(reg); \
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movq %rbx, SCTX_RBX(reg); \
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movq %rcx, SCTX_RCX(reg); \
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movq %r8, SCTX_R8(reg); \
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movq %r9, SCTX_R9(reg); \
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movq %r10, SCTX_R10(reg); \
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movq %r11, SCTX_R11(reg); \
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movq %r12, SCTX_R12(reg); \
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movq %r13, SCTX_R13(reg); \
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movq %r14, SCTX_R14(reg); \
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movq %r15, SCTX_R15(reg); \
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#define LOAD_GPR_STATE(reg) \
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movq SCTX_RBP(reg), %rbp; \
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movq SCTX_RBX(reg), %rbx; \
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movq SCTX_RCX(reg), %rcx; \
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movq SCTX_R8(reg), %r8; \
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movq SCTX_R9(reg), %r9; \
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movq SCTX_R10(reg), %r10; \
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movq SCTX_R11(reg), %r11; \
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movq SCTX_R12(reg), %r12; \
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movq SCTX_R13(reg), %r13; \
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movq SCTX_R14(reg), %r14; \
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movq SCTX_R15(reg), %r15; \
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/*
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* Macros to save and restore vcpu registers which are not
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* done by SVM.
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*/
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#define SAVE_GUEST_STATE(reg) \
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movq %rdi, SCTX_GUEST_RDI(reg); \
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movq %rsi, SCTX_GUEST_RSI(reg); \
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movq %rdx, SCTX_GUEST_RDX(reg); \
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SAVE_GPR_STATE(reg)
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#define LOAD_GUEST_STATE(reg) \
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movq SCTX_GUEST_RDI(reg), %rdi; \
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movq SCTX_GUEST_RSI(reg), %rsi; \
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movq SCTX_GUEST_RDX(reg), %rdx; \
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LOAD_GPR_STATE(reg)
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/*
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* Macros to save and restore host registers which are not
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* saved by SVM.
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*/
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#define SAVE_HOST_STATE(reg) \
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mov %fs, SCTX_HOST_FS(reg); \
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mov %gs, SCTX_HOST_GS(reg); \
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movq %rsp, SCTX_HOST_RSP(reg); \
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SAVE_GPR_STATE(reg)
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#define LOAD_HOST_STATE(reg) \
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mov SCTX_HOST_FS(reg), %fs; \
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mov SCTX_HOST_GS(reg), %gs; \
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movq SCTX_HOST_RSP(reg), %rsp; \
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LOAD_GPR_STATE(reg)
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/*
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* This is where virtual machine vcpu start execution.
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* int svm_launch(vmcb_pa, gswctx, hswctx)
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* vmcb_pa - VMCB physical address is in %rdi.
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* gswctx - Guest context is in %rsi.
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* hswctx - Host context is in %rdx.
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*
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* Note: SVM guarantees host RSP and RAX will be restored
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* back after guest exit. RAX is where VMCB Phy addr is so
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* we are left with only RSP. RSP will hold base for guest
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* software context which will have base for host software
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* context.
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*/
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ENTRY(svm_launch)
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/* Save host GPRs. */
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SAVE_HOST_STATE(%rdx)
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/*
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* Move the parameters to final destinations.
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* RAX - VMCB phy addr.
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* RSP - Guest software context.
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* SCTX_GUEST_HOST(guest) - Host software context.
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*/
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movq %rdi, %rax
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movq %rsi, %rsp
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movq %rdx, SCTX_GUEST_HCTX_BASE(%rsp)
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/* Load guest context. */
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LOAD_GUEST_STATE(%rsp)
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vmload %rax
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vmrun %rax
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vmsave %rax
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/* Save guest state. */
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SAVE_GUEST_STATE(%rsp)
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/* Restore host context base in RDX. */
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movq SCTX_GUEST_HCTX_BASE(%rsp), %rdx
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/* Restore host GPRs. */
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LOAD_HOST_STATE(%rdx)
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ret
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END(svm_launch)
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