diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/Ia32/LongJump.c')
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/LongJump.c | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/LongJump.c b/MdePkg/Library/BaseLib/Ia32/LongJump.c deleted file mode 100644 index cf5fc5b58d..0000000000 --- a/MdePkg/Library/BaseLib/Ia32/LongJump.c +++ /dev/null @@ -1,70 +0,0 @@ -/** @file
- Implementation of _LongJump() on IA-32.
-
- Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-
-#include "BaseLibInternals.h"
-
-
-/**
- Restores the CPU context that was saved with SetJump().
-
- Restores the CPU context from the buffer specified by JumpBuffer.
- This function never returns to the caller.
- Instead is resumes execution based on the state of JumpBuffer.
-
- @param JumpBuffer A pointer to CPU context buffer.
- @param Value The value to return when the SetJump() context is restored.
-
-**/
-__declspec (naked)
-VOID
-EFIAPI
-InternalLongJump (
- IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer,
- IN UINTN Value
- )
-{
- _asm {
- mov eax, [PcdGet32 (PcdControlFlowEnforcementPropertyMask)]
- test eax, eax
- jz CetDone
- _emit 0x0F
- _emit 0x20
- _emit 0xE0 ; mov eax, cr4
- bt eax, 23 ; check if CET is enabled
- jnc CetDone
-
- mov edx, [esp + 4] ; edx = JumpBuffer
- mov edx, [edx + 24] ; edx = target SSP
- _emit 0xF3
- _emit 0x0F
- _emit 0x1E
- _emit 0xC8 ; READSSP EAX
- sub edx, eax ; edx = delta
- mov eax, edx ; eax = delta
-
- shr eax, 2 ; eax = delta/sizeof(UINT32)
- _emit 0xF3
- _emit 0x0F
- _emit 0xAE
- _emit 0xE8 ; INCSSP EAX
-
-CetDone:
-
- pop eax ; skip return address
- pop edx ; edx <- JumpBuffer
- pop eax ; eax <- Value
- mov ebx, [edx]
- mov esi, [edx + 4]
- mov edi, [edx + 8]
- mov ebp, [edx + 12]
- mov esp, [edx + 16]
- jmp dword ptr [edx + 20]
- }
-}
-
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