MdePkg/Library/BaseLib/Ebc/SetJumpLongJump.c

   1 /** @file
   2   Switch Stack functions.
   3
   4   Copyright (c) 2006, Intel Corporation
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13   Module Name:  SetJumpLongJump.c
  14
  15 **/
  16
  17 /**
  18   Worker function that checks ASSERT condition for JumpBuffer
  19
  20   Checks ASSERT condition for JumpBuffer.
  21
  22   If JumpBuffer is NULL, then ASSERT().
  23   For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
  24
  25   @param  JumpBuffer    A pointer to CPU context buffer.
  26
  27 **/
  28 VOID
  29 InternalAssertJumpBuffer (
  30   IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer
  31   );
  32
  33 /**
  34   Saves the current CPU context that can be restored with a call to LongJump() and returns 0.
  35
  36   Saves the current CPU context in the buffer specified by JumpBuffer and returns 0.  The initial
  37   call to SetJump() must always return 0.  Subsequent calls to LongJump() cause a non-zero
  38   value to be returned by SetJump().
  39
  40   If JumpBuffer is NULL, then ASSERT().
  41   For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
  42
  43   @param  JumpBuffer    A pointer to CPU context buffer.
  44
  45 **/
  46 UINTN
  47 EFIAPI
  48 SetJump (
  49   IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer
  50   )
  51 {
  52   InternalAssertJumpBuffer (JumpBuffer);
  53   return 0;
  54 }
  55
  56 /**
  57   Restores the CPU context that was saved with SetJump().
  58
  59   Restores the CPU context from the buffer specified by JumpBuffer.
  60   This function never returns to the caller.
  61   Instead is resumes execution based on the state of JumpBuffer.
  62
  63   @param  JumpBuffer    A pointer to CPU context buffer.
  64   @param  Value         The value to return when the SetJump() context is restored.
  65
  66 **/
  67 VOID
  68 EFIAPI
  69 InternalLongJump (
  70   IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer,
  71   IN      UINTN                     Value
  72   )
  73 {
  74   //
  75   // This function cannot work on EBC
  76   //
  77   ASSERT (FALSE);
  78 }