MdePkg/Library/BaseLib/LoongArch64/SwitchStack.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # InternalSwitchStackAsm for LoongArch
   4 #
   5 # Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
   6 #
   7 # SPDX-License-Identifier: BSD-2-Clause-Patent
   8 #
   9 #------------------------------------------------------------------------------
  10
  11 #define STORE   st.d    /* 64 bit mode regsave instruction */
  12 #define LOAD    ld.d    /* 64 bit mode regload instruction */
  13 #define RSIZE   8       /* 64 bit mode register size */
  14
  15 ASM_GLOBAL ASM_PFX(InternalSwitchStackAsm)
  16
  17 /**
  18   This allows the caller to switch the stack and goes to the new entry point
  19
  20   @param  JumpBuffer    A pointer to CPU context buffer.
  21 **/
  22
  23 ASM_PFX(InternalSwitchStackAsm):
  24   LOAD    $ra, $a0, RSIZE * 11
  25   LOAD    $s0, $a0, RSIZE * 0
  26   LOAD    $s1, $a0, RSIZE * 1
  27   LOAD    $s2, $a0, RSIZE * 2
  28   LOAD    $s3, $a0, RSIZE * 3
  29   LOAD    $s4, $a0, RSIZE * 4
  30   LOAD    $s5, $a0, RSIZE * 5
  31   LOAD    $s6, $a0, RSIZE * 6
  32   LOAD    $s7, $a0, RSIZE * 7
  33   LOAD    $s8, $a0, RSIZE * 8
  34   LOAD    $sp, $a0, RSIZE * 9
  35   LOAD    $fp, $a0, RSIZE * 10
  36   LOAD    $a0, $sp, 0
  37   LOAD    $a1, $sp, 8
  38   jirl    $zero, $ra, 0
  39   .end