diff options
Diffstat (limited to 'EmulatorPkg/Sec')
| -rw-r--r-- | EmulatorPkg/Sec/Ia32/SwitchRam.asm | 94 | ||||
| -rw-r--r-- | EmulatorPkg/Sec/Sec.inf | 3 | ||||
| -rw-r--r-- | EmulatorPkg/Sec/X64/SwitchRam.asm | 76 |
3 files changed, 173 insertions, 0 deletions
diff --git a/EmulatorPkg/Sec/Ia32/SwitchRam.asm b/EmulatorPkg/Sec/Ia32/SwitchRam.asm new file mode 100644 index 0000000..a2e1f3e --- /dev/null +++ b/EmulatorPkg/Sec/Ia32/SwitchRam.asm @@ -0,0 +1,94 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2007 - 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.
+;
+; Module Name:
+;
+; Stack.asm
+;
+; Abstract:
+;
+; Switch the stack from temporary memory to permenent memory.
+;
+;------------------------------------------------------------------------------
+
+ .586p
+ .model flat,C
+ .code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; SecSwitchStack (
+; UINT32 TemporaryMemoryBase,
+; UINT32 PermenentMemoryBase
+; );
+;------------------------------------------------------------------------------
+SecSwitchStack PROC
+ ;
+ ; Save three register: eax, ebx, ecx
+ ;
+ push eax
+ push ebx
+ push ecx
+ push edx
+
+ ;
+ ; !!CAUTION!! this function address's is pushed into stack after
+ ; migration of whole temporary memory, so need save it to permenent
+ ; memory at first!
+ ;
+
+ mov ebx, [esp + 20] ; Save the first parameter
+ mov ecx, [esp + 24] ; Save the second parameter
+
+ ;
+ ; Save this function's return address into permenent memory at first.
+ ; Then, Fixup the esp point to permenent memory
+ ;
+ mov eax, esp
+ sub eax, ebx
+ add eax, ecx
+ mov edx, dword ptr [esp] ; copy pushed register's value to permenent memory
+ mov dword ptr [eax], edx
+ mov edx, dword ptr [esp + 4]
+ mov dword ptr [eax + 4], edx
+ mov edx, dword ptr [esp + 8]
+ mov dword ptr [eax + 8], edx
+ mov edx, dword ptr [esp + 12]
+ mov dword ptr [eax + 12], edx
+ mov edx, dword ptr [esp + 16] ; Update this function's return address into permenent memory
+ mov dword ptr [eax + 16], edx
+ mov esp, eax ; From now, esp is pointed to permenent memory
+
+ ;
+ ; Fixup the ebp point to permenent memory
+ ;
+ mov eax, ebp
+ sub eax, ebx
+ add eax, ecx
+ mov ebp, eax ; From now, ebp is pointed to permenent memory
+
+ ;
+ ; Fixup callee's ebp point for PeiDispatch
+ ;
+ mov eax, dword ptr [ebp]
+ sub eax, ebx
+ add eax, ecx
+ mov dword ptr [ebp], eax ; From now, Temporary's PPI caller's stack is in permenent memory
+
+ pop edx
+ pop ecx
+ pop ebx
+ pop eax
+ ret
+SecSwitchStack ENDP
+
+ END
diff --git a/EmulatorPkg/Sec/Sec.inf b/EmulatorPkg/Sec/Sec.inf index 484e7a0..d253fd7 100644 --- a/EmulatorPkg/Sec/Sec.inf +++ b/EmulatorPkg/Sec/Sec.inf @@ -3,6 +3,7 @@ #
# Main executable file of Unix Emulator that loads PEI core after initialization finished.
# Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR>
+# Copyright (c) 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
@@ -26,10 +27,12 @@ Sec.c
[Sources.X64]
+ X64/SwitchRam.asm
X64/SwitchRam.S
[Sources.IA32]
Ia32/TempRam.c
+ Ia32/SwitchRam.asm
Ia32/SwitchRam.S
[Packages]
diff --git a/EmulatorPkg/Sec/X64/SwitchRam.asm b/EmulatorPkg/Sec/X64/SwitchRam.asm new file mode 100644 index 0000000..d1a7b94 --- /dev/null +++ b/EmulatorPkg/Sec/X64/SwitchRam.asm @@ -0,0 +1,76 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+; Portitions copyright (c) 2011, Apple Inc. 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.
+;
+;------------------------------------------------------------------------------
+
+EXTERN CopyMem:PROC
+EXTERN ZeroMem:PROC
+
+ .code
+
+;------------------------------------------------------------------------------
+; EFI_STATUS
+; EFIAPI
+; SecTemporaryRamSupport (
+; IN CONST EFI_PEI_SERVICES **PeiServices, // %rcx
+; IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase, // %rdx
+; IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase, // %r8
+; IN UINTN CopySize // %r9
+; )
+;------------------------------------------------------------------------------
+SecTemporaryRamSupport PROC
+ ; Adjust callers %rbp to account for stack move
+ sub rbp, rdx ; Calc offset of %rbp in Temp Memory
+ add rbp, r8 ; add in permanent base to offset
+
+ push rbp ; stack frame is for the debugger
+ mov rbp, rsp
+
+ push rdx ; Save TemporaryMemoryBase
+ push r8 ; Save PermanentMemoryBase
+ push r9 ; Save CopySize
+
+ ;
+ ; Copy all of temp RAM to permanent memory, including stack
+ ;
+ ; CopyMem (PermanentMemoryBase, TemporaryMemoryBase, CopySize);
+ ; %rcx, %rdx, %r8
+ mov rcx, r8 ; Shift arguments
+ mov r8, r9
+ sub rsp, 028h ; Allocate register spill area & 16-byte align stack
+ call CopyMem
+ ; Temp mem stack now copied to permanent location. %esp still in temp memory
+ add rsp, 028h
+
+ pop r9 ; CopySize (old stack)
+ pop r8 ; PermanentMemoryBase (old stack)
+ pop rdx ; TemporaryMemoryBase (old stack)
+
+ mov rcx, rsp ; Move to new stack
+ sub rcx, rdx ; Calc offset of stack in Temp Memory
+ add rcx, r8 ; Calc PermanentMemoryBase address
+ mov rsp, rcx ; Update stack
+ ; Stack now points to permanent memory
+
+ ; ZeroMem (TemporaryMemoryBase /* rcx */, CopySize /* rdx */);
+ mov rcx, rdx
+ mov rdx, r9
+ sub rsp, 028h ; Allocate register spill area & 16-byte align stack
+ call ZeroMem
+ add rsp, 028h
+
+ ; This data comes off the NEW stack
+ pop rbp
+ ret
+SecTemporaryRamSupport ENDP
+
+ END
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