mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-24 11:45:27 +01:00
366 lines
8.8 KiB
ArmAsm
366 lines
8.8 KiB
ArmAsm
#------------------------------------------------------------------------------
|
|
#*
|
|
#* Copyright (c) 2006 - 2012, 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.
|
|
#*
|
|
#* CpuAsm.S
|
|
#*
|
|
#* Abstract:
|
|
#*
|
|
#------------------------------------------------------------------------------
|
|
|
|
|
|
#.MMX
|
|
#.XMM
|
|
|
|
#EXTRN ASM_PFX(mErrorCodeFlag):DWORD # Error code flags for exceptions
|
|
|
|
|
|
#
|
|
# point to the external interrupt vector table
|
|
#
|
|
ExternalVectorTablePtr:
|
|
.byte 0, 0, 0, 0
|
|
|
|
ASM_GLOBAL ASM_PFX(InitializeExternalVectorTablePtr)
|
|
ASM_PFX(InitializeExternalVectorTablePtr):
|
|
movl 4(%esp), %eax
|
|
movl %eax, ExternalVectorTablePtr
|
|
ret
|
|
|
|
#------------------------------------------------------------------------------
|
|
# VOID
|
|
# SetCodeSelector (
|
|
# UINT16 Selector
|
|
# );
|
|
#------------------------------------------------------------------------------
|
|
ASM_GLOBAL ASM_PFX(SetCodeSelector)
|
|
ASM_PFX(SetCodeSelector):
|
|
movl 4(%esp), %ecx
|
|
subl $0x10, %esp
|
|
leal setCodeSelectorLongJump, %eax
|
|
movl %eax, (%esp)
|
|
movw %cx, 4(%esp)
|
|
.byte 0xFF, 0x2C, 0x24 # jmp *(%esp) note:(FWORD jmp)
|
|
setCodeSelectorLongJump:
|
|
addl $0x10, %esp
|
|
ret
|
|
|
|
#------------------------------------------------------------------------------
|
|
# VOID
|
|
# SetDataSelectors (
|
|
# UINT16 Selector
|
|
# );
|
|
#------------------------------------------------------------------------------
|
|
ASM_GLOBAL ASM_PFX(SetDataSelectors)
|
|
ASM_PFX(SetDataSelectors):
|
|
movl 4(%esp), %ecx
|
|
movw %cx, %ss
|
|
movw %cx, %ds
|
|
movw %cx, %es
|
|
movw %cx, %fs
|
|
movw %cx, %gs
|
|
ret
|
|
|
|
#---------------------------------------;
|
|
# CommonInterruptEntry ;
|
|
#---------------------------------------;
|
|
# The follow algorithm is used for the common interrupt routine.
|
|
|
|
ASM_GLOBAL ASM_PFX(CommonInterruptEntry)
|
|
ASM_PFX(CommonInterruptEntry):
|
|
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.
|
|
#
|
|
xchgl (%esp), %ecx
|
|
movw (%ecx), %cx
|
|
andl $0x0FFFF, %ecx
|
|
cmpl $32, %ecx # Intel reserved vector for exceptions?
|
|
jae NoErrorCode
|
|
bt %ecx, ASM_PFX(mErrorCodeFlag)
|
|
jc HasErrorCode
|
|
|
|
NoErrorCode:
|
|
|
|
#
|
|
# Stack:
|
|
# +---------------------+
|
|
# + EFlags +
|
|
# +---------------------+
|
|
# + CS +
|
|
# +---------------------+
|
|
# + EIP +
|
|
# +---------------------+
|
|
# + ECX +
|
|
# +---------------------+ <-- ESP
|
|
#
|
|
# Registers:
|
|
# ECX - Vector Number
|
|
#
|
|
|
|
#
|
|
# Put Vector Number on stack
|
|
#
|
|
pushl %ecx
|
|
|
|
#
|
|
# Put 0 (dummy) error code on stack, and restore ECX
|
|
#
|
|
xorl %ecx, %ecx # ECX = 0
|
|
xchgl 4(%esp), %ecx
|
|
|
|
jmp ErrorCodeAndVectorOnStack
|
|
|
|
HasErrorCode:
|
|
|
|
#
|
|
# Stack:
|
|
# +---------------------+
|
|
# + EFlags +
|
|
# +---------------------+
|
|
# + CS +
|
|
# +---------------------+
|
|
# + EIP +
|
|
# +---------------------+
|
|
# + Error Code +
|
|
# +---------------------+
|
|
# + ECX +
|
|
# +---------------------+ <-- ESP
|
|
#
|
|
# Registers:
|
|
# ECX - Vector Number
|
|
#
|
|
|
|
#
|
|
# Put Vector Number on stack and restore ECX
|
|
#
|
|
xchgl (%esp), %ecx
|
|
|
|
ErrorCodeAndVectorOnStack:
|
|
pushl %ebp
|
|
movl %esp, %ebp
|
|
|
|
#
|
|
# 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
|
|
#
|
|
andl $0x0fffffff0, %esp
|
|
subl $12, %esp
|
|
|
|
#; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
|
|
pushl %eax
|
|
pushl %ecx
|
|
pushl %edx
|
|
pushl %ebx
|
|
leal 24(%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 16(%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 12(%ebp), %eax
|
|
pushl %eax
|
|
|
|
#; UINT32 Gdtr[2], Idtr[2];
|
|
subl $8, %esp
|
|
sidt (%esp)
|
|
movl 2(%esp), %eax
|
|
xchgl (%esp), %eax
|
|
andl $0x0FFFF, %eax
|
|
movl %eax, 4(%esp)
|
|
|
|
subl $8, %esp
|
|
sgdt (%esp)
|
|
movl 2(%esp), %eax
|
|
xchgl (%esp), %eax
|
|
andl $0x0FFFF, %eax
|
|
movl %eax, 4(%esp)
|
|
|
|
#; UINT32 Ldtr, Tr;
|
|
xorl %eax, %eax
|
|
str %ax
|
|
pushl %eax
|
|
sldt %ax
|
|
pushl %eax
|
|
|
|
#; UINT32 EFlags;
|
|
movl 20(%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, 0x0ae, 0x07 #fxsave [edi]
|
|
|
|
#; UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear
|
|
cld
|
|
|
|
#; UINT32 ExceptionData;
|
|
pushl 8(%ebp)
|
|
|
|
#; call into exception handler
|
|
movl ExternalVectorTablePtr, %eax # get the interrupt vectors base
|
|
orl %eax, %eax # NULL?
|
|
jz nullExternalExceptionHandler
|
|
|
|
mov 4(%ebp), %ecx
|
|
movl (%eax,%ecx,4), %eax
|
|
orl %eax, %eax # NULL?
|
|
jz nullExternalExceptionHandler
|
|
|
|
#; Prepare parameter and call
|
|
movl %esp, %edx
|
|
pushl %edx
|
|
movl 4(%ebp), %edx
|
|
pushl %edx
|
|
|
|
#
|
|
# Call External Exception Handler
|
|
#
|
|
call *%eax
|
|
addl $8, %esp
|
|
|
|
nullExternalExceptionHandler:
|
|
|
|
cli
|
|
#; UINT32 ExceptionData;
|
|
addl $4, %esp
|
|
|
|
#; FX_SAVE_STATE_IA32 FxSaveState;
|
|
movl %esp, %esi
|
|
.byte 0x0f, 0x0ae, 0x0e # fxrstor [esi]
|
|
addl $512, %esp
|
|
|
|
#; 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
|
|
addl $24, %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 20(%ebp)
|
|
|
|
#; UINT32 Ldtr, Tr;
|
|
#; UINT32 Gdtr[2], Idtr[2];
|
|
#; Best not let anyone mess with these particular registers...
|
|
addl $24, %esp
|
|
|
|
#; UINT32 Eip;
|
|
popl 12(%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 16(%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
|
|
addl $8, %esp
|
|
iretl
|
|
|
|
|
|
#END
|
|
|