mirror of https://github.com/acidanthera/audk.git
346 lines
8.6 KiB
NASM
346 lines
8.6 KiB
NASM
TITLE CpuAsm.asm:
|
|
;------------------------------------------------------------------------------
|
|
;*
|
|
;* Copyright 2008 - 2009, Intel Corporation
|
|
;* All rights reserved. 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.
|
|
;*
|
|
;* CpuAsm.asm
|
|
;*
|
|
;* Abstract:
|
|
;*
|
|
;------------------------------------------------------------------------------
|
|
|
|
.code
|
|
|
|
EXTRN mErrorCodeFlag:DWORD ; Error code flags for exceptions
|
|
|
|
;
|
|
; point to the external interrupt vector table
|
|
;
|
|
ExternalVectorTablePtr QWORD 0
|
|
|
|
InitializeExternalVectorTablePtr PROC PUBLIC
|
|
mov ExternalVectorTablePtr, rcx
|
|
ret
|
|
InitializeExternalVectorTablePtr ENDP
|
|
|
|
;------------------------------------------------------------------------------
|
|
; VOID
|
|
; SetCodeSelector (
|
|
; UINT16 Selector
|
|
; );
|
|
;------------------------------------------------------------------------------
|
|
SetCodeSelector PROC PUBLIC
|
|
sub rsp, 0x10
|
|
lea rax, setCodeSelectorLongJump
|
|
mov [rsp], rax
|
|
mov [rsp+4], cx
|
|
jmp fword ptr [rsp]
|
|
setCodeSelectorLongJump:
|
|
add rsp, 0x10
|
|
ret
|
|
SetCodeSelector ENDP
|
|
|
|
;------------------------------------------------------------------------------
|
|
; VOID
|
|
; SetDataSelectors (
|
|
; UINT16 Selector
|
|
; );
|
|
;------------------------------------------------------------------------------
|
|
SetDataSelectors PROC PUBLIC
|
|
mov ss, cx
|
|
mov ds, cx
|
|
mov es, cx
|
|
mov fs, cx
|
|
mov gs, cx
|
|
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
|
|
;
|
|
xchg rcx, [rsp] ; get the return address of call, actually, it is the address of vector number.
|
|
movzx ecx, word ptr [rcx]
|
|
cmp ecx, 32 ; Intel reserved vector for exceptions?
|
|
jae NoErrorCode
|
|
bt mErrorCodeFlag, ecx
|
|
jc @F
|
|
|
|
NoErrorCode:
|
|
|
|
;
|
|
; Push a dummy error code on the stack
|
|
; to maintain coherent stack map
|
|
;
|
|
push [rsp]
|
|
mov qword ptr [rsp + 8], 0
|
|
@@:
|
|
push rbp
|
|
mov rbp, rsp
|
|
|
|
;
|
|
; Stack:
|
|
; +---------------------+ <-- 16-byte aligned ensured by processor
|
|
; + Old SS +
|
|
; +---------------------+
|
|
; + Old RSP +
|
|
; +---------------------+
|
|
; + RFlags +
|
|
; +---------------------+
|
|
; + CS +
|
|
; +---------------------+
|
|
; + RIP +
|
|
; +---------------------+
|
|
; + Error Code +
|
|
; +---------------------+
|
|
; + RCX / Vector Number +
|
|
; +---------------------+
|
|
; + RBP +
|
|
; +---------------------+ <-- RBP, 16-byte aligned
|
|
;
|
|
|
|
|
|
;
|
|
; Since here the stack pointer is 16-byte aligned, so
|
|
; EFI_FX_SAVE_STATE_X64 of EFI_SYSTEM_CONTEXT_x64
|
|
; is 16-byte aligned
|
|
;
|
|
|
|
;; UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax;
|
|
;; UINT64 R8, R9, R10, R11, R12, R13, R14, R15;
|
|
push r15
|
|
push r14
|
|
push r13
|
|
push r12
|
|
push r11
|
|
push r10
|
|
push r9
|
|
push r8
|
|
push rax
|
|
push qword ptr [rbp + 8] ; RCX
|
|
push rdx
|
|
push rbx
|
|
push qword ptr [rbp + 48] ; RSP
|
|
push qword ptr [rbp] ; RBP
|
|
push rsi
|
|
push rdi
|
|
|
|
;; UINT64 Gs, Fs, Es, Ds, Cs, Ss; insure high 16 bits of each is zero
|
|
movzx rax, word ptr [rbp + 56]
|
|
push rax ; for ss
|
|
movzx rax, word ptr [rbp + 32]
|
|
push rax ; for cs
|
|
mov rax, ds
|
|
push rax
|
|
mov rax, es
|
|
push rax
|
|
mov rax, fs
|
|
push rax
|
|
mov rax, gs
|
|
push rax
|
|
|
|
mov [rbp + 8], rcx ; save vector number
|
|
|
|
;; UINT64 Rip;
|
|
push qword ptr [rbp + 24]
|
|
|
|
;; UINT64 Gdtr[2], Idtr[2];
|
|
xor rax, rax
|
|
push rax
|
|
push rax
|
|
sidt [rsp]
|
|
xchg rax, [rsp + 2]
|
|
xchg rax, [rsp]
|
|
xchg rax, [rsp + 8]
|
|
|
|
xor rax, rax
|
|
push rax
|
|
push rax
|
|
sgdt [rsp]
|
|
xchg rax, [rsp + 2]
|
|
xchg rax, [rsp]
|
|
xchg rax, [rsp + 8]
|
|
|
|
;; UINT64 Ldtr, Tr;
|
|
xor rax, rax
|
|
str ax
|
|
push rax
|
|
sldt ax
|
|
push rax
|
|
|
|
;; UINT64 RFlags;
|
|
push qword ptr [rbp + 40]
|
|
|
|
;; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;
|
|
mov rax, cr8
|
|
push rax
|
|
mov rax, cr4
|
|
or rax, 208h
|
|
mov cr4, rax
|
|
push rax
|
|
mov rax, cr3
|
|
push rax
|
|
mov rax, cr2
|
|
push rax
|
|
xor rax, rax
|
|
push rax
|
|
mov rax, cr0
|
|
push rax
|
|
|
|
;; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
|
|
mov rax, dr7
|
|
push rax
|
|
;; clear Dr7 while executing debugger itself
|
|
xor rax, rax
|
|
mov dr7, rax
|
|
|
|
mov rax, dr6
|
|
push rax
|
|
;; insure all status bits in dr6 are clear...
|
|
xor rax, rax
|
|
mov dr6, rax
|
|
|
|
mov rax, dr3
|
|
push rax
|
|
mov rax, dr2
|
|
push rax
|
|
mov rax, dr1
|
|
push rax
|
|
mov rax, dr0
|
|
push rax
|
|
|
|
;; FX_SAVE_STATE_X64 FxSaveState;
|
|
sub rsp, 512
|
|
mov rdi, rsp
|
|
db 0fh, 0aeh, 07h ;fxsave [rdi]
|
|
|
|
;; UINT32 ExceptionData;
|
|
push qword ptr [rbp + 16]
|
|
|
|
;; call into exception handler
|
|
mov rcx, [rbp + 8]
|
|
mov rax, ExternalVectorTablePtr ; get the interrupt vectors base
|
|
mov rax, [rax + rcx * 8]
|
|
or rax, rax ; NULL?
|
|
|
|
je nonNullValue;
|
|
|
|
;; Prepare parameter and call
|
|
; mov rcx, [rbp + 8]
|
|
mov rdx, rsp
|
|
;
|
|
; Per X64 calling convention, allocate maximum parameter stack space
|
|
; and make sure RSP is 16-byte aligned
|
|
;
|
|
sub rsp, 4 * 8 + 8
|
|
call rax
|
|
add rsp, 4 * 8 + 8
|
|
|
|
nonNullValue:
|
|
cli
|
|
;; UINT64 ExceptionData;
|
|
add rsp, 8
|
|
|
|
;; FX_SAVE_STATE_X64 FxSaveState;
|
|
|
|
mov rsi, rsp
|
|
db 0fh, 0aeh, 0Eh ; fxrstor [rsi]
|
|
add rsp, 512
|
|
|
|
;; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
|
|
pop rax
|
|
mov dr0, rax
|
|
pop rax
|
|
mov dr1, rax
|
|
pop rax
|
|
mov dr2, rax
|
|
pop rax
|
|
mov dr3, rax
|
|
;; skip restore of dr6. We cleared dr6 during the context save.
|
|
add rsp, 8
|
|
pop rax
|
|
mov dr7, rax
|
|
|
|
;; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;
|
|
pop rax
|
|
mov cr0, rax
|
|
add rsp, 8 ; not for Cr1
|
|
pop rax
|
|
mov cr2, rax
|
|
pop rax
|
|
mov cr3, rax
|
|
pop rax
|
|
mov cr4, rax
|
|
pop rax
|
|
mov cr8, rax
|
|
|
|
;; UINT64 RFlags;
|
|
pop qword ptr [rbp + 40]
|
|
|
|
;; UINT64 Ldtr, Tr;
|
|
;; UINT64 Gdtr[2], Idtr[2];
|
|
;; Best not let anyone mess with these particular registers...
|
|
add rsp, 48
|
|
|
|
;; UINT64 Rip;
|
|
pop qword ptr [rbp + 24]
|
|
|
|
;; UINT64 Gs, Fs, Es, Ds, Cs, Ss;
|
|
pop rax
|
|
; mov gs, rax ; not for gs
|
|
pop rax
|
|
; mov fs, rax ; not for fs
|
|
; (X64 will not use fs and gs, so we do not restore it)
|
|
pop rax
|
|
mov es, rax
|
|
pop rax
|
|
mov ds, rax
|
|
pop qword ptr [rbp + 32] ; for cs
|
|
pop qword ptr [rbp + 56] ; for ss
|
|
|
|
;; UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax;
|
|
;; UINT64 R8, R9, R10, R11, R12, R13, R14, R15;
|
|
pop rdi
|
|
pop rsi
|
|
add rsp, 8 ; not for rbp
|
|
pop qword ptr [rbp + 48] ; for rsp
|
|
pop rbx
|
|
pop rdx
|
|
pop rcx
|
|
pop rax
|
|
pop r8
|
|
pop r9
|
|
pop r10
|
|
pop r11
|
|
pop r12
|
|
pop r13
|
|
pop r14
|
|
pop r15
|
|
|
|
mov rsp, rbp
|
|
pop rbp
|
|
add rsp, 16
|
|
iretq
|
|
|
|
CommonInterruptEntry ENDP
|
|
|
|
END
|
|
|