MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006 - 2009, Intel Corporation<BR>
   4 # Portions copyright (c) 2008-2009 Apple Inc. All rights reserved.<BR>
   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 #------------------------------------------------------------------------------
  14 .text
  15 .p2align 2
  16
  17 .globl ASM_PFX(SetJump)
  18 .globl ASM_PFX(InternalLongJump)
  19
  20 #/**
  21 #  Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#
  22 #
  23 #  Saves the current CPU context in the buffer specified by JumpBuffer and returns 0.  The initial
  24 #  call to SetJump() must always return 0.  Subsequent calls to LongJump() cause a non-zero
  25 #  value to be returned by SetJump().
  26 #
  27 #  If JumpBuffer is NULL, then ASSERT().
  28 #  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
  29 #
  30 #  @param  JumpBuffer    A pointer to CPU context buffer.
  31 #
  32 #**/
  33 #
  34 #UINTN
  35 #EFIAPI
  36 #SetJump (
  37 #  IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer  // R0
  38 #  );
  39 #
  40 ASM_PFX(SetJump):
  41   mov   r3, r13
  42   stmia r0, {r3-r12,r14}
  43   eor   r0, r0, r0
  44   bx    lr
  45
  46 #/**
  47 #  Restores the CPU context that was saved with SetJump().#
  48 #
  49 #  Restores the CPU context from the buffer specified by JumpBuffer.
  50 #  This function never returns to the caller.
  51 #  Instead is resumes execution based on the state of JumpBuffer.
  52 #
  53 #  @param  JumpBuffer    A pointer to CPU context buffer.
  54 #  @param  Value         The value to return when the SetJump() context is restored.
  55 #
  56 #**/
  57 #VOID
  58 #EFIAPI
  59 #InternalLongJump (
  60 #  IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer,  // R0
  61 #  IN      UINTN                     Value         // R1
  62 #  );
  63 #
  64 ASM_PFX(InternalLongJump):
  65   ldmia  r0, {r3-r12,r14}
  66   mov    r13, r3
  67   mov    r0, r1
  68   bx     lr
  69
  70 ASM_FUNCTION_REMOVE_IF_UNREFERENCED