diff options
Diffstat (limited to 'UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiException.S')
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiException.S | 911 |
1 files changed, 0 insertions, 911 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiException.S b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiException.S deleted file mode 100644 index 4130bf5be5..0000000000 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiException.S +++ /dev/null @@ -1,911 +0,0 @@ -#------------------------------------------------------------------------------
-#
-# Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
-# This program and the accompanying materials
-# are licensed and made available under the terms and conditions of the BSD License
-# which accompanies this distribution. The full text of the license may be found at
-# http://opensource.org/licenses/bsd-license.php.
-#
-# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#
-# Module Name:
-#
-# SmiException.S
-#
-# Abstract:
-#
-# Exception handlers used in SM mode
-#
-#------------------------------------------------------------------------------
-
-ASM_GLOBAL ASM_PFX(SmiPFHandler)
-ASM_GLOBAL ASM_PFX(PageFaultStubFunction)
-ASM_GLOBAL ASM_PFX(gSmiMtrrs)
-ASM_GLOBAL ASM_PFX(gcSmiIdtr)
-ASM_GLOBAL ASM_PFX(gcSmiGdtr)
-ASM_GLOBAL ASM_PFX(gcPsd)
-ASM_GLOBAL ASM_PFX(FeaturePcdGet (PcdCpuSmmProfileEnable))
-
- .data
-
-NullSeg: .quad 0 # reserved by architecture
-CodeSeg32:
- .word -1 # LimitLow
- .word 0 # BaseLow
- .byte 0 # BaseMid
- .byte 0x9b
- .byte 0xcf # LimitHigh
- .byte 0 # BaseHigh
-ProtModeCodeSeg32:
- .word -1 # LimitLow
- .word 0 # BaseLow
- .byte 0 # BaseMid
- .byte 0x9b
- .byte 0xcf # LimitHigh
- .byte 0 # BaseHigh
-ProtModeSsSeg32:
- .word -1 # LimitLow
- .word 0 # BaseLow
- .byte 0 # BaseMid
- .byte 0x93
- .byte 0xcf # LimitHigh
- .byte 0 # BaseHigh
-DataSeg32:
- .word -1 # LimitLow
- .word 0 # BaseLow
- .byte 0 # BaseMid
- .byte 0x93
- .byte 0xcf # LimitHigh
- .byte 0 # BaseHigh
-CodeSeg16:
- .word -1
- .word 0
- .byte 0
- .byte 0x9b
- .byte 0x8f
- .byte 0
-DataSeg16:
- .word -1
- .word 0
- .byte 0
- .byte 0x93
- .byte 0x8f
- .byte 0
-CodeSeg64:
- .word -1 # LimitLow
- .word 0 # BaseLow
- .byte 0 # BaseMid
- .byte 0x9b
- .byte 0xaf # LimitHigh
- .byte 0 # BaseHigh
-.equ GDT_SIZE, .- NullSeg
-
-TssSeg:
- .word TSS_DESC_SIZE -1 # LimitLow
- .word 0 # BaseLow
- .byte 0 # BaseMid
- .byte 0x89
- .byte 0x00 # LimitHigh
- .byte 0 # BaseHigh
-ExceptionTssSeg:
- .word TSS_DESC_SIZE - 1 # LimitLow
- .word 0 # BaseLow
- .byte 0 # BaseMid
- .byte 0x89
- .byte 0x00 # LimitHigh
- .byte 0 # BaseHigh
-
-.equ CODE_SEL, CodeSeg32 - NullSeg
-.equ DATA_SEL, DataSeg32 - NullSeg
-.equ TSS_SEL, TssSeg - NullSeg
-.equ EXCEPTION_TSS_SEL, ExceptionTssSeg - NullSeg
-
-# IA32 TSS fields
-.equ TSS_ESP0, 4
-.equ TSS_SS0, 8
-.equ TSS_ESP1, 12
-.equ TSS_SS1, 16
-.equ TSS_ESP2, 20
-.equ TSS_SS2, 24
-.equ TSS_CR3, 28
-.equ TSS_EIP, 32
-.equ TSS_EFLAGS, 36
-.equ TSS_EAX, 40
-.equ TSS_ECX, 44
-.equ TSS_EDX, 48
-.equ TSS_EBX, 52
-.equ TSS_ESP, 56
-.equ TSS_EBP, 60
-.equ TSS_ESI, 64
-.equ TSS_EDI, 68
-.equ TSS_ES, 72
-.equ TSS_CS, 76
-.equ TSS_SS, 80
-.equ TSS_DS, 84
-.equ TSS_FS, 88
-.equ TSS_GS, 92
-.equ TSS_LDT, 96
-
-# Create 2 TSS segments just after GDT
-TssDescriptor:
- .word 0 # PreviousTaskLink
- .word 0 # Reserved
- .long 0 # ESP0
- .word 0 # SS0
- .word 0 # Reserved
- .long 0 # ESP1
- .word 0 # SS1
- .word 0 # Reserved
- .long 0 # ESP2
- .word 0 # SS2
- .word 0 # Reserved
- .long 0 # CR3
- .long 0 # EIP
- .long 0 # EFLAGS
- .long 0 # EAX
- .long 0 # ECX
- .long 0 # EDX
- .long 0 # EBX
- .long 0 # ESP
- .long 0 # EBP
- .long 0 # ESI
- .long 0 # EDI
- .word 0 # ES
- .word 0 # Reserved
- .word 0 # CS
- .word 0 # Reserved
- .word 0 # SS
- .word 0 # Reserved
- .word 0 # DS
- .word 0 # Reserved
- .word 0 # FS
- .word 0 # Reserved
- .word 0 # GS
- .word 0 # Reserved
- .word 0 # LDT Selector
- .word 0 # Reserved
- .word 0 # T
- .word 0 # I/O Map Base
-.equ TSS_DESC_SIZE, . - TssDescriptor
-
-ExceptionTssDescriptor:
- .word 0 # PreviousTaskLink
- .word 0 # Reserved
- .long 0 # ESP0
- .word 0 # SS0
- .word 0 # Reserved
- .long 0 # ESP1
- .word 0 # SS1
- .word 0 # Reserved
- .long 0 # ESP2
- .word 0 # SS2
- .word 0 # Reserved
- .long 0 # CR3
- .long PFHandlerEntry # EIP
- .long 00000002 # EFLAGS
- .long 0 # EAX
- .long 0 # ECX
- .long 0 # EDX
- .long 0 # EBX
- .long 0 # ESP
- .long 0 # EBP
- .long 0 # ESI
- .long 0 # EDI
- .word DATA_SEL # ES
- .word 0 # Reserved
- .word CODE_SEL # CS
- .word 0 # Reserved
- .word DATA_SEL # SS
- .word 0 # Reserved
- .word DATA_SEL # DS
- .word 0 # Reserved
- .word DATA_SEL # FS
- .word 0 # Reserved
- .word DATA_SEL # GS
- .word 0 # Reserved
- .word 0 # LDT Selector
- .word 0 # Reserved
- .word 0 # T
- .word 0 # I/O Map Base
-
-ASM_PFX(gcPsd):
- .ascii "PSDSIG "
- .word PSD_SIZE
- .word 2
- .word 1 << 2
- .word CODE_SEL
- .word DATA_SEL
- .word DATA_SEL
- .word DATA_SEL
- .word 0
- .long 0
- .long 0
- .long 0
- .long 0
- .quad 0
- .long NullSeg
- .long 0
- .long GDT_SIZE
- .long 0
- .space 24, 0
- .long ASM_PFX(gSmiMtrrs)
- .long 0
-.equ PSD_SIZE, . - ASM_PFX(gcPsd)
-
-ASM_PFX(gcSmiGdtr): .word GDT_SIZE - 1
- .long NullSeg
-
-ASM_PFX(gcSmiIdtr): .word IDT_SIZE - 1
- .long _SmiIDT
-
-_SmiIDT:
-# The following segment repeats 32 times:
-# No. 1
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 2
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 3
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 4
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 5
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 6
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 7
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 8
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 9
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 10
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 11
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 12
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 13
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 14
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 15
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 16
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 17
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 18
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 19
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 20
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 21
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 22
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 23
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 24
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 25
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 26
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 27
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 28
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 29
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 30
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 31
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-# No. 32
- .word 0 # Offset 0:15
- .word CODE_SEL
- .byte 0 # Unused
- .byte 0x8e # Interrupt Gate, Present
- .word 0 # Offset 16:31
-
-.equ IDT_SIZE, . - _SmiIDT
-
-TaskGateDescriptor:
- .word 0 # Reserved
- .word EXCEPTION_TSS_SEL # TSS Segment selector
- .byte 0 # Reserved
- .byte 0x85 # Task Gate, present, DPL = 0
- .word 0 # Reserved
-
- .text
-
-#------------------------------------------------------------------------------
-# PageFaultIdtHandlerSmmProfile is the entry point for all exceptions
-#
-# Stack:
-#+---------------------+
-#+ EFlags +
-#+---------------------+
-#+ CS +
-#+---------------------+
-#+ EIP +
-#+---------------------+
-#+ Error Code +
-#+---------------------+
-#+ Vector Number +
-#+---------------------+
-#+ EBP +
-#+---------------------+ <-- EBP
-#
-# RSP set to odd multiple of 8 means ErrCode PRESENT
-#------------------------------------------------------------------------------
-ASM_GLOBAL ASM_PFX(PageFaultIdtHandlerSmmProfile)
-ASM_PFX(PageFaultIdtHandlerSmmProfile):
- pushl $0x0e # Page Fault
- pushl %ebp
- movl %esp, %ebp
-
-
- #
- # Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
- # is 16-byte aligned
- #
- andl $0xfffffff0, %esp
- subl $12, %esp
-
-## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
- pushl %eax
- pushl %ecx
- pushl %edx
- pushl %ebx
- leal (6*4)(%ebp), %ecx
- pushl %ecx # ESP
- pushl (%ebp) # EBP
- pushl %esi
- pushl %edi
-
-## UINT32 Gs, Fs, Es, Ds, Cs, Ss;
- movl %ss, %eax
- pushl %eax
- movzwl (4*4)(%ebp), %eax
- pushl %eax
- movl %ds, %eax
- pushl %eax
- movl %es, %eax
- pushl %eax
- movl %fs, %eax
- pushl %eax
- movl %gs, %eax
- pushl %eax
-
-## UINT32 Eip;
- movl (3*4)(%ebp), %eax
- pushl %eax
-
-## UINT32 Gdtr[2], Idtr[2];
- subl $8, %esp
- sidt (%esp)
- movl 2(%esp), %eax
- xchgl (%esp), %eax
- andl $0xffff, %eax
- movl %eax, 4(%esp)
-
- subl $8, %esp
- sgdt (%esp)
- movl 2(%esp), %eax
- xchgl (%esp), %eax
- andl $0xffff, %eax
- movl %eax, 4(%esp)
-
-## UINT32 Ldtr, Tr;
- xorl %eax, %eax
- strw %ax
- pushl %eax
- sldtw %ax
- pushl %eax
-
-## UINT32 EFlags;
- movl (5*4)(%ebp), %eax
- pushl %eax
-
-## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
- movl %cr4, %eax
- orl $0x208, %eax
- movl %eax, %cr4
- pushl %eax
- movl %cr3, %eax
- pushl %eax
- movl %cr2, %eax
- pushl %eax
- xorl %eax, %eax
- pushl %eax
- movl %cr0, %eax
- pushl %eax
-
-## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
- movl %dr7, %eax
- pushl %eax
- movl %dr6, %eax
- pushl %eax
- movl %dr3, %eax
- pushl %eax
- movl %dr2, %eax
- pushl %eax
- movl %dr1, %eax
- pushl %eax
- movl %dr0, %eax
- pushl %eax
-
-## FX_SAVE_STATE_IA32 FxSaveState;
- subl $512, %esp
- movl %esp, %edi
- .byte 0x0f, 0xae, 0x07 #fxsave [edi]
-
-# UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear
- cld
-
-## UINT32 ExceptionData;
- pushl (2*4)(%ebp)
-
-## call into exception handler
-
-## Prepare parameter and call
- movl %esp, %edx
- pushl %edx
- movl (1*4)(%ebp), %edx
- pushl %edx
-
- #
- # Call External Exception Handler
- #
- movl $ASM_PFX(SmiPFHandler), %eax
- call *%eax
- addl $8, %esp
- jmp L4
-
-L4:
-## UINT32 ExceptionData;
- addl $4, %esp
-
-## FX_SAVE_STATE_IA32 FxSaveState;
- movl %esp, %esi
- .byte 0xf, 0xae, 0xe # fxrstor [esi]
- addl $512, %esp
-
-## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
-## Skip restoration of DRx registers to support debuggers
-## that set breakpoints in interrupt/exception context
- addl $4*6, %esp
-
-## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
- popl %eax
- movl %eax, %cr0
- addl $4, %esp # not for Cr1
- popl %eax
- movl %eax, %cr2
- popl %eax
- movl %eax, %cr3
- popl %eax
- movl %eax, %cr4
-
-## UINT32 EFlags;
- popl (5*4)(%ebp)
-
-## UINT32 Ldtr, Tr;
-## UINT32 Gdtr[2], Idtr[2];
-## Best not let anyone mess with these particular registers...
- addl $24, %esp
-
-## UINT32 Eip;
- popl (3*4)(%ebp)
-
-## UINT32 Gs, Fs, Es, Ds, Cs, Ss;
-## NOTE - modified segment registers could hang the debugger... We
-## could attempt to insulate ourselves against this possibility,
-## but that poses risks as well.
-##
- popl %gs
- popl %fs
- popl %es
- popl %ds
- popl (4*4)(%ebp)
- popl %ss
-
-## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
- popl %edi
- popl %esi
- addl $4, %esp # not for ebp
- addl $4, %esp # not for esp
- popl %ebx
- popl %edx
- popl %ecx
- popl %eax
-
- movl %ebp, %esp
- popl %ebp
-
-# Enable TF bit after page fault handler runs
- btsl $8, 16(%esp) # EFLAGS
-
- addl $8, %esp # skip INT# & ErrCode
-Return:
- iret
-#
-# Page Fault Exception Handler entry when SMM Stack Guard is enabled
-# Executiot starts here after a task switch
-#
-PFHandlerEntry:
-#
-# Get this processor's TSS
-#
- subl $8, %esp
- sgdt 2(%esp)
- movl 4(%esp), %eax # GDT base
- addl $8, %esp
- movl (TSS_SEL+2)(%eax), %ecx
- shll $8, %ecx
- movb (TSS_SEL+7)(%eax), %cl
- rorl $8, %ecx # ecx = TSS base
-
- movl %esp, %ebp
-
- #
- # Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
- # is 16-byte aligned
- #
- andl $0xfffffff0, %esp
- subl $12, %esp
-
-## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
- pushl TSS_EAX(%ecx)
- pushl TSS_ECX(%ecx)
- pushl TSS_EDX(%ecx)
- pushl TSS_EBX(%ecx)
- pushl TSS_ESP(%ecx)
- pushl TSS_EBP(%ecx)
- pushl TSS_ESI(%ecx)
- pushl TSS_EDI(%ecx)
-
-## UINT32 Gs, Fs, Es, Ds, Cs, Ss;
- movzwl TSS_SS(%ecx), %eax
- pushl %eax
- movzwl TSS_CS(%ecx), %eax
- pushl %eax
- movzwl TSS_DS(%ecx), %eax
- pushl %eax
- movzwl TSS_ES(%ecx), %eax
- pushl %eax
- movzwl TSS_FS(%ecx), %eax
- pushl %eax
- movzwl TSS_GS(%ecx), %eax
- pushl %eax
-
-## UINT32 Eip;
- pushl TSS_EIP(%ecx)
-
-## UINT32 Gdtr[2], Idtr[2];
- subl $8, %esp
- sidt (%esp)
- movl 2(%esp), %eax
- xchgl (%esp), %eax
- andl $0xFFFF, %eax
- movl %eax, 4(%esp)
-
- subl $8, %esp
- sgdt (%esp)
- movl 2(%esp), %eax
- xchgl (%esp), %eax
- andl $0xFFFF, %eax
- movl %eax, 4(%esp)
-
-## UINT32 Ldtr, Tr;
- movl $TSS_SEL, %eax
- pushl %eax
- movzwl TSS_LDT(%ecx), %eax
- pushl %eax
-
-## UINT32 EFlags;
- pushl TSS_EFLAGS(%ecx)
-
-## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
- movl %cr4, %eax
- orl $0x208, %eax
- movl %eax, %cr4
- pushl %eax
- movl %cr3, %eax
- pushl %eax
- movl %cr2, %eax
- pushl %eax
- xorl %eax, %eax
- pushl %eax
- movl %cr0, %eax
- pushl %eax
-
-## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
- movl %dr7, %eax
- pushl %eax
- movl %dr6, %eax
- pushl %eax
- movl %dr3, %eax
- pushl %eax
- movl %dr2, %eax
- pushl %eax
- movl %dr1, %eax
- pushl %eax
- movl %dr0, %eax
- pushl %eax
-
-## FX_SAVE_STATE_IA32 FxSaveState;
-## Clear TS bit in CR0 to avoid Device Not Available Exception (#NM)
-## when executing fxsave/fxrstor instruction
- clts
- subl $512, %esp
- movl %esp, %edi
- .byte 0x0f, 0xae, 0x07 #fxsave [edi]
-
-# UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear
- cld
-
-## UINT32 ExceptionData;
- pushl (%ebp)
-
-## call into exception handler
- movl %ecx, %ebx
- movl $ASM_PFX(SmiPFHandler), %eax
-
-## Prepare parameter and call
- movl %esp, %edx
- pushl %edx
- movl $14, %edx
- pushl %edx
-
- #
- # Call External Exception Handler
- #
- call *%eax
- addl $8, %esp
-
- movl %ebx, %ecx
-## UINT32 ExceptionData;
- addl $4, %esp
-
-## FX_SAVE_STATE_IA32 FxSaveState;
- movl %esp, %esi
- .byte 0xf, 0xae, 0xe # fxrstor [esi]
- addl $512, %esp
-
-## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
-## Skip restoration of DRx registers to support debuggers
-## that set breakpoints in interrupt/exception context
- addl $4*6, %esp
-
-## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
- popl %eax
- movl %eax, %cr0
- addl $4, %esp # not for Cr1
- popl %eax
- movl %eax, %cr2
- popl %eax
- movl %eax, TSS_CR3(%ecx)
- popl %eax
- movl %eax, %cr4
-
-## UINT32 EFlags;
- popl TSS_EFLAGS(%ecx)
-
-## UINT32 Ldtr, Tr;
-## UINT32 Gdtr[2], Idtr[2];
-## Best not let anyone mess with these particular registers...
- addl $24, %esp
-
-## UINT32 Eip;
- popl TSS_EIP(%ecx)
-
-## UINT32 Gs, Fs, Es, Ds, Cs, Ss;
-## NOTE - modified segment registers could hang the debugger... We
-## could attempt to insulate ourselves against this possibility,
-## but that poses risks as well.
-##
- popl %eax
- movw %ax, TSS_GS(%ecx)
- popl %eax
- movw %ax, TSS_FS(%ecx)
- popl %eax
- movw %ax, TSS_ES(%ecx)
- popl %eax
- movw %ax, TSS_DS(%ecx)
- popl %eax
- movw %ax, TSS_CS(%ecx)
- popl %eax
- movw %ax, TSS_SS(%ecx)
-
-## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
- popl TSS_EDI(%ecx)
- popl TSS_ESI(%ecx)
- addl $4, %esp # not for ebp
- addl $4, %esp # not for esp
- popl TSS_EBX(%ecx)
- popl TSS_EDX(%ecx)
- popl TSS_ECX(%ecx)
- popl TSS_EAX(%ecx)
-
- movl %ebp, %esp
-
-# Set single step DB# if SMM profile is enabled and page fault exception happens
- cmpb $0, ASM_PFX(FeaturePcdGet (PcdCpuSmmProfileEnable))
- jz Done2
-# Create return context for iret in stub function
- movl TSS_ESP(%ecx), %eax # Get old stack pointer
- movl TSS_EIP(%ecx), %ebx
- movl %ebx, -0xc(%eax) # create EIP in old stack
- movzwl TSS_CS(%ecx), %ebx
- movl %ebx, -0x8(%eax) # create CS in old stack
- movl TSS_EFLAGS(%ecx), %ebx
- btsl $8,%ebx
- movl %ebx, -0x4(%eax) # create eflags in old stack
- movl TSS_ESP(%ecx), %eax # Get old stack pointer
- subl $12, %eax # minus 12 byte
- movl %eax, TSS_ESP(%ecx) # Set new stack pointer
-
-# Replace the EIP of interrupted task with stub function
- movl $ASM_PFX(PageFaultStubFunction), %eax
- movl %eax, TSS_EIP(%ecx)
-# Jump to the iret so next page fault handler as a task will start again after iret.
-
-Done2:
-
- addl $4, %esp # skip ErrCode
-
- jmp Return
-
-ASM_PFX(PageFaultStubFunction):
-#
-# we need clean TS bit in CR0 to execute
-# x87 FPU/MMX/SSE/SSE2/SSE3/SSSE3/SSE4 instructions.
-#
- clts
- iret
-
-ASM_GLOBAL ASM_PFX(InitializeIDTSmmStackGuard)
-ASM_PFX(InitializeIDTSmmStackGuard):
- pushl %ebx
-#
-# If SMM Stack Guard feature is enabled, the Page Fault Exception entry in IDT
-# is a Task Gate Descriptor so that when a Page Fault Exception occurs,
-# the processors can use a known good stack in case stack ran out.
-#
- leal _SmiIDT + 14 * 8, %ebx
- leal TaskGateDescriptor, %edx
- movl (%edx), %eax
- movl %eax, (%ebx)
- movl 4(%edx), %eax
- movl %eax, 4(%ebx)
-
- popl %ebx
- ret
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