Add EBC, FTW, Crc32SectionExtract, NullMemoryTest modules.

[mirror_edk2.git] / MdeModulePkg / Universal / Ebc / Dxe / x64 / EbcLowLevel.S

diff --git a/MdeModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.S b/MdeModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.S
new file mode 100644 (file)
index 0000000..5384625
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+++ b/MdeModulePkg/Universal/Ebc/Dxe/x64/EbcLowLevel.S
@@ -0,0 +1,144 @@
+#****************************************************************************\r
+#*                                                                         \r
+#*  Copyright (c) 2006, Intel Corporation                                                         \r
+#*  All rights reserved. This program and the accompanying materials                          \r
+#*  are licensed and made available under the terms and conditions of the BSD License         \r
+#*  which accompanies this distribution.  The full text of the license may be found at        \r
+#*  http://opensource.org/licenses/bsd-license.php                                            \r
+#*                                                                                            \r
+#*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     \r
+#*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             \r
+#*                                                                          \r
+#****************************************************************************\r
+#****************************************************************************\r
+#                                   REV 1.0\r
+#****************************************************************************\r
+#\r
+# Rev  Date      Description\r
+# ---  --------  ------------------------------------------------------------\r
+# 1.0  05/09/12  Initial creation of file.\r
+#\r
+#****************************************************************************\r
+\r
+#* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\r
+# This code provides low level routines that support the Virtual Machine\r
+# for option ROMs. \r
+#* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\r
+\r
+#---------------------------------------------------------------------------\r
+# Equate files needed.\r
+#---------------------------------------------------------------------------\r
+\r
+#---------------------------------------------------------------------------\r
+##GenericPostSegment      SEGMENT USE16\r
+#---------------------------------------------------------------------------\r
+\r
+#****************************************************************************\r
+# EbcLLCALLEX\r
+#\r
+# This function is called to execute an EBC CALLEX instruction. \r
+# This instruction requires that we thunk out to external native\r
+# code. For x64, we switch stacks, copy the arguments to the stack\r
+# and jump to the specified function. \r
+# On return, we restore the stack pointer to its original location.\r
+#\r
+# Destroys no working registers.\r
+#****************************************************************************\r
+.global _CopyMem;\r
+\r
+# VOID EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)\r
+.global _EbcLLCALLEXNative;\r
+_EbcLLCALLEXNative:\r
+      push   %rbp\r
+      push   %rbx\r
+      mov    %rsp, %rbp\r
+      # Function prolog\r
+\r
+      # Copy FuncAddr to a preserved register.\r
+      mov    %rcx, %rbx\r
+\r
+      # Set stack pointer to new value\r
+      sub    %r8,  %rdx\r
+      sub    %rsp, %r8\r
+      mov    %rsp, %rcx\r
+      sub    %rsp, 0x20\r
+      call   _CopyMem \r
+      add    %rsp, 0x20\r
+\r
+      # Considering the worst case, load 4 potiential arguments\r
+      # into registers.\r
+      mov    (%rsp), %rcx\r
+      mov    8(%rsp), %rdx\r
+      mov    10(%rsp), %r8\r
+      mov    18(%rsp), %r9\r
+\r
+      # Now call the external routine\r
+      call  *%rbx\r
+\r
+      # Function epilog\r
+      mov      %rbp, %rsp\r
+      pop      %rbx\r
+      pop      %rbp\r
+      ret\r
+\r
+\r
+# UINTN EbcLLGetEbcEntryPoint(VOID);\r
+# Routine Description:\r
+#   The VM thunk code stuffs an EBC entry point into a processor\r
+#   register. Since we can't use inline assembly to get it from\r
+#   the interpreter C code, stuff it into the return value \r
+#   register and return.\r
+#\r
+# Arguments:\r
+#     None.\r
+#\r
+# Returns:\r
+#     The contents of the register in which the entry point is passed.\r
+#\r
+.global _EbcLLGetEbcEntryPoint;\r
+_EbcLLGetEbcEntryPoint:\r
+    ret\r
+\r
+#/*++\r
+#\r
+#Routine Description:\r
+#  \r
+#  Return the caller's value of the stack pointer.\r
+#\r
+#Arguments:\r
+#\r
+#  None.\r
+#\r
+#Returns:\r
+#\r
+#  The current value of the stack pointer for the caller. We\r
+#  adjust it by 4 here because when they called us, the return address\r
+#  is put on the stack, thereby lowering it by 4 bytes.\r
+#\r
+#--*/\r
+\r
+# UINTN EbcLLGetStackPointer()            \r
+.global _EbcLLGetStackPointer;\r
+_EbcLLGetStackPointer:\r
+    mov    %rsp, %rax\r
+    # Stack adjusted by this much when we were called,\r
+    # For this function, it's 4.\r
+    add   $4, %rax\r
+    ret\r
+\r
+.global _EbcLLGetReturnValue;\r
+_EbcLLGetReturnValue:\r
+# UINT64 EbcLLGetReturnValue(VOID);\r
+# Routine Description:\r
+#   When EBC calls native, on return the VM has to stuff the return\r
+#   value into a VM register. It's assumed here that the value is still\r
+#    in the register, so simply return and the caller should get the\r
+#   return result properly.\r
+#\r
+# Arguments:\r
+#     None.\r
+#\r
+# Returns:\r
+#     The unmodified value returned by the native code.\r
+#\r
+    ret\r