91a03f78ba
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3893 1.Added SecFspWrapperPlatformSecLibSample support for X64. 2.Adopted FSPT_ARCH2_UPD in SecFspWrapperPlatformSecLibSample. 3.Moved Fsp.h up one level to be shared across IA32 and X64. Cc: Chasel Chiu <chasel.chiu@intel.com> Cc: Nate DeSimone <nathaniel.l.desimone@intel.com> Cc: Star Zeng <star.zeng@intel.com> Cc: Ashraf Ali S <ashraf.ali.s@intel.com> Signed-off-by: Ted Kuo <ted.kuo@intel.com> Reviewed-by: Chasel Chiu <chasel.chiu@intel.com> Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
74 lines
2.1 KiB
NASM
74 lines
2.1 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Abstract:
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;
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; Switch the stack from temporary memory to permanent memory.
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; SecSwitchStack (
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; UINT32 TemporaryMemoryBase,
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; UINT32 PermanentMemoryBase
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(SecSwitchStack)
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ASM_PFX(SecSwitchStack):
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;
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; Save four register: rax, rbx, rcx, rdx
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;
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push rax
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push rbx
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push rcx
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push rdx
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;
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; !!CAUTION!! this function address's is pushed into stack after
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; migration of whole temporary memory, so need save it to permanent
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; memory at first!
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;
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mov rbx, rcx ; Save the first parameter
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mov rcx, rdx ; Save the second parameter
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;
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; Save this function's return address into permanent memory at first.
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; Then, Fixup the esp point to permanent memory
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;
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mov rax, rsp
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sub rax, rbx
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add rax, rcx
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mov rdx, qword [rsp] ; copy pushed register's value to permanent memory
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mov qword [rax], rdx
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mov rdx, qword [rsp + 8]
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mov qword [rax + 8], rdx
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mov rdx, qword [rsp + 16]
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mov qword [rax + 16], rdx
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mov rdx, qword [rsp + 24]
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mov qword [rax + 24], rdx
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mov rdx, qword [rsp + 32] ; Update this function's return address into permanent memory
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mov qword [rax + 32], rdx
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mov rsp, rax ; From now, rsp is pointed to permanent memory
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;
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; Fixup the rbp point to permanent memory
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;
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mov rax, rbp
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sub rax, rbx
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add rax, rcx
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mov rbp, rax ; From now, rbp is pointed to permanent memory
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pop rdx
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pop rcx
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pop rbx
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pop rax
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ret
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