diff options
Diffstat (limited to 'UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm | 307 |
1 files changed, 1 insertions, 306 deletions
diff --git a/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm b/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm index 0924dc5bb3..7f8f0d6f3a 100644 --- a/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm +++ b/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.asm @@ -1,7 +1,7 @@ TITLE CpuAsm.asm:
;------------------------------------------------------------------------------
;*
-;* Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+;* Copyright (c) 2006 - 2013, 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
@@ -20,19 +20,6 @@ .model flat,C
.code
-EXTRN mErrorCodeFlag:DWORD ; Error code flags for exceptions
-
-;
-; point to the external interrupt vector table
-;
-ExternalVectorTablePtr DWORD 0
-
-InitializeExternalVectorTablePtr PROC PUBLIC
- mov eax, [esp+4]
- mov ExternalVectorTablePtr, eax
- ret
-InitializeExternalVectorTablePtr ENDP
-
;------------------------------------------------------------------------------
; VOID
; SetCodeSelector (
@@ -67,297 +54,5 @@ SetDataSelectors PROC PUBLIC ret
SetDataSelectors ENDP
-;---------------------------------------;
-; CommonInterruptEntry ;
-;---------------------------------------;
-; The follow algorithm is used for the common interrupt routine.
-
-CommonInterruptEntry PROC PUBLIC
- cli
- ;
- ; All interrupt handlers are invoked through interrupt gates, so
- ; IF flag automatically cleared at the entry point
- ;
-
- ;
- ; Calculate vector number
- ;
- ; Get the return address of call, actually, it is the
- ; address of vector number.
- ;
- xchg ecx, [esp]
- mov cx, [ecx]
- and ecx, 0FFFFh
- cmp ecx, 32 ; Intel reserved vector for exceptions?
- jae NoErrorCode
- bt mErrorCodeFlag, ecx
- jc HasErrorCode
-
-NoErrorCode:
-
- ;
- ; Stack:
- ; +---------------------+
- ; + EFlags +
- ; +---------------------+
- ; + CS +
- ; +---------------------+
- ; + EIP +
- ; +---------------------+
- ; + ECX +
- ; +---------------------+ <-- ESP
- ;
- ; Registers:
- ; ECX - Vector Number
- ;
-
- ;
- ; Put Vector Number on stack
- ;
- push ecx
-
- ;
- ; Put 0 (dummy) error code on stack, and restore ECX
- ;
- xor ecx, ecx ; ECX = 0
- xchg ecx, [esp+4]
-
- jmp ErrorCodeAndVectorOnStack
-
-HasErrorCode:
-
- ;
- ; Stack:
- ; +---------------------+
- ; + EFlags +
- ; +---------------------+
- ; + CS +
- ; +---------------------+
- ; + EIP +
- ; +---------------------+
- ; + Error Code +
- ; +---------------------+
- ; + ECX +
- ; +---------------------+ <-- ESP
- ;
- ; Registers:
- ; ECX - Vector Number
- ;
-
- ;
- ; Put Vector Number on stack and restore ECX
- ;
- xchg ecx, [esp]
-
-ErrorCodeAndVectorOnStack:
- push ebp
- mov ebp, esp
-
- ;
- ; Stack:
- ; +---------------------+
- ; + EFlags +
- ; +---------------------+
- ; + CS +
- ; +---------------------+
- ; + EIP +
- ; +---------------------+
- ; + Error Code +
- ; +---------------------+
- ; + Vector Number +
- ; +---------------------+
- ; + EBP +
- ; +---------------------+ <-- EBP
- ;
-
- ;
- ; Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
- ; is 16-byte aligned
- ;
- and esp, 0fffffff0h
- sub esp, 12
-
-;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
- push eax
- push ecx
- push edx
- push ebx
- lea ecx, [ebp + 6 * 4]
- push ecx ; ESP
- push dword ptr [ebp] ; EBP
- push esi
- push edi
-
-;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;
- mov eax, ss
- push eax
- movzx eax, word ptr [ebp + 4 * 4]
- push eax
- mov eax, ds
- push eax
- mov eax, es
- push eax
- mov eax, fs
- push eax
- mov eax, gs
- push eax
-
-;; UINT32 Eip;
- mov eax, [ebp + 3 * 4]
- push eax
-
-;; UINT32 Gdtr[2], Idtr[2];
- sub esp, 8
- sidt [esp]
- mov eax, [esp + 2]
- xchg eax, [esp]
- and eax, 0FFFFh
- mov [esp+4], eax
-
- sub esp, 8
- sgdt [esp]
- mov eax, [esp + 2]
- xchg eax, [esp]
- and eax, 0FFFFh
- mov [esp+4], eax
-
-;; UINT32 Ldtr, Tr;
- xor eax, eax
- str ax
- push eax
- sldt ax
- push eax
-
-;; UINT32 EFlags;
- mov eax, [ebp + 5 * 4]
- push eax
-
-;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
- mov eax, cr4
- or eax, 208h
- mov cr4, eax
- push eax
- mov eax, cr3
- push eax
- mov eax, cr2
- push eax
- xor eax, eax
- push eax
- mov eax, cr0
- push eax
-
-;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
- mov eax, dr7
- push eax
- mov eax, dr6
- push eax
- mov eax, dr3
- push eax
- mov eax, dr2
- push eax
- mov eax, dr1
- push eax
- mov eax, dr0
- push eax
-
-;; FX_SAVE_STATE_IA32 FxSaveState;
- sub esp, 512
- mov edi, esp
- db 0fh, 0aeh, 07h ;fxsave [edi]
-
-;; UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear
- cld
-
-;; UINT32 ExceptionData;
- push dword ptr [ebp + 2 * 4]
-
-;; call into exception handler
- mov eax, ExternalVectorTablePtr ; get the interrupt vectors base
- or eax, eax ; NULL?
- jz nullExternalExceptionHandler
-
- mov ecx, [ebp + 4]
- mov eax, [eax + ecx * 4]
- or eax, eax ; NULL?
- jz nullExternalExceptionHandler
-
-;; Prepare parameter and call
- mov edx, esp
- push edx
- mov edx, dword ptr [ebp + 1 * 4]
- push edx
-
- ;
- ; Call External Exception Handler
- ;
- call eax
- add esp, 8
-
-nullExternalExceptionHandler:
-
- cli
-;; UINT32 ExceptionData;
- add esp, 4
-
-;; FX_SAVE_STATE_IA32 FxSaveState;
- mov esi, esp
- db 0fh, 0aeh, 0eh ; fxrstor [esi]
- add esp, 512
-
-;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
-;; Skip restoration of DRx registers to support in-circuit emualators
-;; or debuggers set breakpoint in interrupt/exception context
- add esp, 4 * 6
-
-;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
- pop eax
- mov cr0, eax
- add esp, 4 ; not for Cr1
- pop eax
- mov cr2, eax
- pop eax
- mov cr3, eax
- pop eax
- mov cr4, eax
-
-;; UINT32 EFlags;
- pop dword ptr [ebp + 5 * 4]
-
-;; UINT32 Ldtr, Tr;
-;; UINT32 Gdtr[2], Idtr[2];
-;; Best not let anyone mess with these particular registers...
- add esp, 24
-
-;; UINT32 Eip;
- pop dword ptr [ebp + 3 * 4]
-
-;; 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.
-;;
- pop gs
- pop fs
- pop es
- pop ds
- pop dword ptr [ebp + 4 * 4]
- pop ss
-
-;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
- pop edi
- pop esi
- add esp, 4 ; not for ebp
- add esp, 4 ; not for esp
- pop ebx
- pop edx
- pop ecx
- pop eax
-
- mov esp, ebp
- pop ebp
- add esp, 8
- iretd
-
-CommonInterruptEntry ENDP
END
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