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  • Committer: Bazaar Package Importer
  • Author(s): Bastian Blank
  • Date: 2010-05-06 15:47:38 UTC
  • mto: (1.3.1) (15.1.1 sid) (4.1.1 experimental)
  • mto: This revision was merged to the branch mainline in revision 3.
  • Revision ID: james.westby@ubuntu.com-20100506154738-agoz0rlafrh1fnq7
Tags: upstream-4.0.0
Import upstream version 4.0.0

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xen/arch/x86/hvm/vmx/entry.S
 
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/*
 
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 * entry.S: VMX architecture-specific entry/exit handling.
 
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 * Copyright (c) 2004, Intel Corporation.
 
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 * Copyright (c) 2008, Citrix Systems, Inc.
 
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 *
 
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 * This program is free software; you can redistribute it and/or modify it
 
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 * under the terms and conditions of the GNU General Public License,
 
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 * version 2, as published by the Free Software Foundation.
 
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 *
 
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 * This program is distributed in the hope it will be useful, but WITHOUT
 
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 
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 * more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License along with
 
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 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 
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 * Place - Suite 330, Boston, MA 02111-1307 USA.
 
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 */
 
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#include <xen/config.h>
 
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#include <xen/errno.h>
 
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#include <xen/softirq.h>
 
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#include <asm/types.h>
 
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#include <asm/asm_defns.h>
 
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#include <asm/apicdef.h>
 
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#include <asm/page.h>
 
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#include <public/xen.h>
 
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#define VMRESUME     .byte 0x0f,0x01,0xc3
 
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#define VMLAUNCH     .byte 0x0f,0x01,0xc2
 
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#define VMREAD(off)  .byte 0x0f,0x78,0x47,((off)-UREGS_rip)
 
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#define VMWRITE(off) .byte 0x0f,0x79,0x47,((off)-UREGS_rip)
 
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/* VMCS field encodings */
 
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#define GUEST_RSP    0x681c
 
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#define GUEST_RIP    0x681e
 
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#define GUEST_RFLAGS 0x6820
 
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#define get_current(reg)                        \
 
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        mov $STACK_SIZE-BYTES_PER_LONG, r(reg); \
 
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        or  r(sp), r(reg);                      \
 
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        and $~(BYTES_PER_LONG-1),r(reg);        \
 
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        mov (r(reg)),r(reg);
 
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#if defined(__x86_64__)
 
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#define r(reg) %r##reg
 
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#define addr_of(lbl) lbl(%rip)
 
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#define call_with_regs(fn)                      \
 
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        mov  %rsp,%rdi;                         \
 
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        call fn;
 
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#else /* defined(__i386__) */
 
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#define r(reg) %e##reg
 
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#define addr_of(lbl) lbl
 
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#define UREGS_rip UREGS_eip
 
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#define UREGS_rsp UREGS_esp
 
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#define call_with_regs(fn)                      \
 
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        mov  %esp,%eax;                         \
 
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        push %eax;                              \
 
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        call fn;                                \
 
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        add  $4,%esp;
 
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#endif
 
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        ALIGN
 
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.globl vmx_asm_vmexit_handler
 
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vmx_asm_vmexit_handler:
 
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#if defined(__x86_64__)
 
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        push %rdi
 
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        push %rsi
 
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        push %rdx
 
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        push %rcx
 
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        push %rax
 
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        push %r8
 
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        push %r9
 
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        push %r10
 
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        push %r11
 
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        push %rbx
 
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        push %rbp
 
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        push %r12
 
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        push %r13
 
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        push %r14
 
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        push %r15
 
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#else /* defined(__i386__) */
 
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        push %eax
 
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        push %ebp
 
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        push %edi
 
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        push %esi
 
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        push %edx
 
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        push %ecx
 
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        push %ebx
 
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#endif
 
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        get_current(bx)
 
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        movb $1,VCPU_vmx_launched(r(bx))
 
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        lea  UREGS_rip(r(sp)),r(di)
 
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        mov  $GUEST_RIP,%eax
 
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        /*VMREAD(UREGS_rip)*/
 
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        .byte 0x0f,0x78,0x07  /* vmread r(ax),(r(di)) */
 
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        mov  $GUEST_RSP,%eax
 
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        VMREAD(UREGS_rsp)
 
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        mov  $GUEST_RFLAGS,%eax
 
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        VMREAD(UREGS_eflags)
 
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        mov  %cr2,r(ax)
 
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        mov  r(ax),VCPU_hvm_guest_cr2(r(bx))
 
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#ifndef NDEBUG
 
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        mov  $0xbeef,%ax
 
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        mov  %ax,UREGS_error_code(r(sp))
 
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        mov  %ax,UREGS_entry_vector(r(sp))
 
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        mov  %ax,UREGS_saved_upcall_mask(r(sp))
 
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        mov  %ax,UREGS_cs(r(sp))
 
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        mov  %ax,UREGS_ds(r(sp))
 
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        mov  %ax,UREGS_es(r(sp))
 
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        mov  %ax,UREGS_fs(r(sp))
 
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        mov  %ax,UREGS_gs(r(sp))
 
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        mov  %ax,UREGS_ss(r(sp))
 
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#endif
 
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        call_with_regs(vmx_vmexit_handler)
 
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.globl vmx_asm_do_vmentry
 
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vmx_asm_do_vmentry:
 
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        call vmx_intr_assist
 
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        get_current(bx)
 
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        cli
 
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        mov  VCPU_processor(r(bx)),%eax
 
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        shl  $IRQSTAT_shift,r(ax)
 
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        lea  addr_of(irq_stat),r(dx)
 
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        cmpl $0,(r(dx),r(ax),1)
 
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        jnz  .Lvmx_process_softirqs
 
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        testb $0xff,VCPU_vmx_emulate(r(bx))
 
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        jnz .Lvmx_goto_emulator
 
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        testb $0xff,VCPU_vmx_realmode(r(bx))
 
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        jz .Lvmx_not_realmode
 
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        cmpw $0,VCPU_vm86_seg_mask(r(bx))
 
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        jnz .Lvmx_goto_emulator
 
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        call_with_regs(vmx_enter_realmode) 
 
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.Lvmx_not_realmode:
 
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        call vmx_vmenter_helper
 
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        mov  VCPU_hvm_guest_cr2(r(bx)),r(ax)
 
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        mov  r(ax),%cr2
 
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        lea  UREGS_rip(r(sp)),r(di)
 
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        mov  $GUEST_RIP,%eax
 
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        /*VMWRITE(UREGS_rip)*/
 
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        .byte 0x0f,0x79,0x07  /* vmwrite (r(di)),r(ax) */
 
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        mov  $GUEST_RSP,%eax
 
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        VMWRITE(UREGS_rsp)
 
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        mov  $GUEST_RFLAGS,%eax
 
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        VMWRITE(UREGS_eflags)
 
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        cmpb $0,VCPU_vmx_launched(r(bx))
 
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#if defined(__x86_64__)
 
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        pop  %r15
 
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        pop  %r14
 
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        pop  %r13
 
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        pop  %r12
 
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        pop  %rbp
 
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        pop  %rbx
 
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        pop  %r11
 
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        pop  %r10
 
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        pop  %r9
 
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        pop  %r8
 
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        pop  %rax
 
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        pop  %rcx
 
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        pop  %rdx
 
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        pop  %rsi
 
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        pop  %rdi
 
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#else /* defined(__i386__) */
 
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        pop  %ebx
 
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        pop  %ecx
 
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        pop  %edx
 
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        pop  %esi
 
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        pop  %edi
 
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        pop  %ebp
 
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        pop  %eax
 
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#endif
 
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        je   .Lvmx_launch
 
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/*.Lvmx_resume:*/
 
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        VMRESUME
 
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        sti
 
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        call vm_resume_fail
 
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        ud2
 
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.Lvmx_launch:
 
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        VMLAUNCH
 
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        sti
 
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        call vm_launch_fail
 
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        ud2
 
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.Lvmx_goto_emulator:
 
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        sti
 
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        call_with_regs(vmx_realmode)
 
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        jmp  vmx_asm_do_vmentry
 
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.Lvmx_process_softirqs:
 
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        sti
 
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        call do_softirq
 
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        jmp  vmx_asm_do_vmentry