entry.s

xen虚拟机源代码安装包

        movb  %cl,TRAPBOUNCE_flags(%rdx)
        call  compat_create_bounce_frame
        jmp   compat_test_all_events
2:      movl  $TRAP_gp_fault,UREGS_entry_vector(%rsp)
        movq  VCPU_gp_fault_addr(%rbx),%rax
        movzwl VCPU_gp_fault_sel(%rbx),%esi
        movb  $(TBF_EXCEPTION|TBF_EXCEPTION_ERRCODE|TBF_INTERRUPT),%cl
        movl  $0,TRAPBOUNCE_error_code(%rdx)
        jmp   1b

ENTRY(compat_sysenter)
        cmpl  $TRAP_gp_fault,UREGS_entry_vector(%rsp)
        movzwl VCPU_sysenter_sel(%rbx),%eax
        movzwl VCPU_gp_fault_sel(%rbx),%ecx
        cmovel %ecx,%eax
        testl $~3,%eax
        movl  $FLAT_COMPAT_USER_SS,UREGS_ss(%rsp)
        cmovzl %ecx,%eax
        movw  %ax,TRAPBOUNCE_cs(%rdx)
        call  compat_create_bounce_frame
        jmp   compat_test_all_events

ENTRY(compat_int80_direct_trap)
        call  compat_create_bounce_frame
        jmp   compat_test_all_events

/* CREATE A BASIC EXCEPTION FRAME ON GUEST OS (RING-1) STACK:            */
/*   {[ERRCODE,] EIP, CS, EFLAGS, [ESP, SS]}                             */
/* %rdx: trap_bounce, %rbx: struct vcpu                                  */
/* On return only %rbx and %rdx are guaranteed non-clobbered.            */
compat_create_bounce_frame:
        ASSERT_INTERRUPTS_ENABLED
        mov   %fs,%edi
        testb $2,UREGS_cs+8(%rsp)
        jz    1f
        /* Push new frame at registered guest-OS stack base. */
        movl  VCPU_kernel_sp(%rbx),%esi
.Lft1:  mov   VCPU_kernel_ss(%rbx),%fs
        subl  $2*4,%esi
        movl  UREGS_rsp+8(%rsp),%eax
.Lft2:  movl  %eax,%fs:(%rsi)
        movl  UREGS_ss+8(%rsp),%eax
.Lft3:  movl  %eax,%fs:4(%rsi)
        jmp   2f
1:      /* In kernel context already: push new frame at existing %rsp. */
        movl  UREGS_rsp+8(%rsp),%esi
.Lft4:  mov   UREGS_ss+8(%rsp),%fs
2:
        movb  TRAPBOUNCE_flags(%rdx),%cl
        subl  $3*4,%esi
        movq  VCPU_vcpu_info(%rbx),%rax
        pushq COMPAT_VCPUINFO_upcall_mask(%rax)
        testb $TBF_INTERRUPT,%cl
        setnz %ch                       # TBF_INTERRUPT -> set upcall mask
        orb   %ch,COMPAT_VCPUINFO_upcall_mask(%rax)
        popq  %rax
        shll  $16,%eax                  # Bits 16-23: saved_upcall_mask
        movw  UREGS_cs+8(%rsp),%ax      # Bits  0-15: CS
.Lft5:  movl  %eax,%fs:4(%rsi)          # CS / saved_upcall_mask
        shrl  $16,%eax
        testb %al,%al                   # Bits 0-7: saved_upcall_mask
        setz  %ch                       # %ch == !saved_upcall_mask
        movl  UREGS_eflags+8(%rsp),%eax
        andl  $~X86_EFLAGS_IF,%eax
        addb  %ch,%ch                   # Bit 9 (EFLAGS.IF)
        orb   %ch,%ah                   # Fold EFLAGS.IF into %eax
.Lft6:  movl  %eax,%fs:2*4(%rsi)        # EFLAGS
        movl  UREGS_rip+8(%rsp),%eax
.Lft7:  movl  %eax,%fs:(%rsi)           # EIP
        testb $TBF_EXCEPTION_ERRCODE,%cl
        jz    1f
        subl  $4,%esi
        movl  TRAPBOUNCE_error_code(%rdx),%eax
.Lft8:  movl  %eax,%fs:(%rsi)           # ERROR CODE
1:
        testb $TBF_FAILSAFE,%cl
        jz    2f
        subl  $4*4,%esi
        movl  %gs,%eax
.Lft9:  movl  %eax,%fs:3*4(%rsi)        # GS
.Lft10: movl  %edi,%fs:2*4(%rsi)        # FS
        movl  %es,%eax
.Lft11: movl  %eax,%fs:1*4(%rsi)        # ES
        movl  %ds,%eax
.Lft12: movl  %eax,%fs:0*4(%rsi)        # DS
2:
        /* Rewrite our stack frame and return to guest-OS mode. */
        /* IA32 Ref. Vol. 3: TF, VM, RF and NT flags are cleared on trap. */
        andl  $~(X86_EFLAGS_VM|X86_EFLAGS_RF|\
                 X86_EFLAGS_NT|X86_EFLAGS_TF),UREGS_eflags+8(%rsp)
        mov   %fs,UREGS_ss+8(%rsp)
        movl  %esi,UREGS_rsp+8(%rsp)
.Lft13: mov   %edi,%fs
        movzwl TRAPBOUNCE_cs(%rdx),%eax
        /* Null selectors (0-3) are not allowed. */
        testl $~3,%eax
        jz    domain_crash_synchronous
        movl  %eax,UREGS_cs+8(%rsp)
        movl  TRAPBOUNCE_eip(%rdx),%eax
        movl  %eax,UREGS_rip+8(%rsp)
        ret
.section .fixup,"ax"
.Lfx13:
        xorl  %edi,%edi
        jmp   .Lft13
.previous
.section __ex_table,"a"
        .quad  .Lft1,domain_crash_synchronous  ,  .Lft2,compat_crash_page_fault
        .quad  .Lft3,compat_crash_page_fault_4 ,  .Lft4,domain_crash_synchronous
        .quad  .Lft5,compat_crash_page_fault_4 ,  .Lft6,compat_crash_page_fault_8
        .quad  .Lft7,compat_crash_page_fault   ,  .Lft8,compat_crash_page_fault
        .quad  .Lft9,compat_crash_page_fault_12, .Lft10,compat_crash_page_fault_8
        .quad .Lft11,compat_crash_page_fault_4 , .Lft12,compat_crash_page_fault
        .quad .Lft13,.Lfx13
.previous

compat_crash_page_fault_12:
        addl  $4,%esi
compat_crash_page_fault_8:
        addl  $4,%esi
compat_crash_page_fault_4:
        addl  $4,%esi
compat_crash_page_fault:
.Lft14: mov   %edi,%fs
        movl  %esi,%edi
        call  show_page_walk
        jmp   domain_crash_synchronous
.section .fixup,"ax"
.Lfx14:
        xorl  %edi,%edi
        jmp   .Lft14
.previous
.section __ex_table,"a"
        .quad .Lft14,.Lfx14
.previous

.section .rodata, "a", @progbits

ENTRY(compat_hypercall_table)
        .quad compat_set_trap_table     /*  0 */
        .quad do_mmu_update
        .quad compat_set_gdt
        .quad do_stack_switch
        .quad compat_set_callbacks
        .quad do_fpu_taskswitch         /*  5 */
        .quad do_sched_op_compat
        .quad compat_platform_op
        .quad do_set_debugreg
        .quad do_get_debugreg
        .quad compat_update_descriptor  /* 10 */
        .quad compat_ni_hypercall
        .quad compat_memory_op
        .quad compat_multicall
        .quad compat_update_va_mapping
        .quad compat_set_timer_op       /* 15 */
        .quad do_event_channel_op_compat
        .quad compat_xen_version
        .quad do_console_io
        .quad compat_physdev_op_compat
        .quad compat_grant_table_op     /* 20 */
        .quad compat_vm_assist
        .quad compat_update_va_mapping_otherdomain
        .quad compat_iret
        .quad compat_vcpu_op
        .quad compat_ni_hypercall       /* 25 */
        .quad compat_mmuext_op
        .quad do_xsm_op
        .quad compat_nmi_op
        .quad compat_sched_op
        .quad compat_callback_op        /* 30 */
        .quad compat_xenoprof_op
        .quad do_event_channel_op
        .quad compat_physdev_op
        .quad do_hvm_op
        .quad do_sysctl                 /* 35 */
        .quad do_domctl
        .quad compat_kexec_op
        .rept __HYPERVISOR_arch_0-((.-compat_hypercall_table)/8)
        .quad compat_ni_hypercall
        .endr
        .quad do_mca                    /* 48 */
        .rept NR_hypercalls-((.-compat_hypercall_table)/8)
        .quad compat_ni_hypercall
        .endr

ENTRY(compat_hypercall_args_table)
        .byte 1 /* compat_set_trap_table    */  /*  0 */
        .byte 4 /* compat_mmu_update        */
        .byte 2 /* compat_set_gdt           */
        .byte 2 /* compat_stack_switch      */
        .byte 4 /* compat_set_callbacks     */
        .byte 1 /* compat_fpu_taskswitch    */  /*  5 */
        .byte 2 /* compat_sched_op_compat   */
        .byte 1 /* compat_platform_op       */
        .byte 2 /* compat_set_debugreg      */
        .byte 1 /* compat_get_debugreg      */
        .byte 4 /* compat_update_descriptor */  /* 10 */
        .byte 0 /* compat_ni_hypercall      */
        .byte 2 /* compat_memory_op         */
        .byte 2 /* compat_multicall         */
        .byte 4 /* compat_update_va_mapping */
        .byte 2 /* compat_set_timer_op      */  /* 15 */
        .byte 1 /* compat_event_channel_op_compat */
        .byte 2 /* compat_xen_version       */
        .byte 3 /* compat_console_io        */
        .byte 1 /* compat_physdev_op_compat */
        .byte 3 /* compat_grant_table_op    */  /* 20 */
        .byte 2 /* compat_vm_assist         */
        .byte 5 /* compat_update_va_mapping_otherdomain */
        .byte 0 /* compat_iret              */
        .byte 3 /* compat_vcpu_op           */
        .byte 0 /* compat_ni_hypercall      */  /* 25 */
        .byte 4 /* compat_mmuext_op         */
        .byte 1 /* do_xsm_op                */
        .byte 2 /* compat_nmi_op            */
        .byte 2 /* compat_sched_op          */
        .byte 2 /* compat_callback_op       */  /* 30 */
        .byte 2 /* compat_xenoprof_op       */
        .byte 2 /* compat_event_channel_op  */
        .byte 2 /* compat_physdev_op        */
        .byte 2 /* do_hvm_op                */
        .byte 1 /* do_sysctl                */  /* 35 */
        .byte 1 /* do_domctl                */
        .byte 2 /* compat_kexec_op          */
        .rept __HYPERVISOR_arch_0-(.-compat_hypercall_args_table)
        .byte 0 /* compat_ni_hypercall      */
        .endr
        .byte 1 /* do_mca                   */
        .rept NR_hypercalls-(.-compat_hypercall_args_table)
        .byte 0 /* compat_ni_hypercall      */
        .endr