diff options
Diffstat (limited to 'UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S')
-rw-r--r-- | UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S b/UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S new file mode 100644 index 0000000000..b6dff5ed77 --- /dev/null +++ b/UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S @@ -0,0 +1,79 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php.
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+# Module Name:
+#
+# SwitchStack.S
+#
+# Abstract:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+# Routine Description:
+#
+# Routine for switching stacks with 2 parameters
+#
+# Arguments:
+#
+# (rcx) EntryPoint - Entry point with new stack.
+# (rdx) Context1 - Parameter1 for entry point.
+# (r8) Context2 - Parameter2 for entry point.
+# (r9) NewStack - The pointer to new stack.
+#
+# Returns:
+#
+# None
+#
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(EfiInternalSwitchStack)
+ASM_PFX(EfiInternalSwitchStack):
+ mov %rcx, %rax
+ mov %rdx, %rcx
+ mov %r8, %rdx
+ #
+ # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
+ # in case the callee wishes to spill them.
+ #
+ lea -0x20(%r9), %rsp
+ call *%rax
+
+
+
+#------------------------------------------------------------------------------
+# Routine Description:
+#
+# Routine for switching stacks with 2 parameters (Unix ABI)
+#
+# Arguments:
+#
+# (rdi) EntryPoint - Entry point with new stack.
+# (rsi) Context1 - Parameter1 for entry point.
+# (rdx) Context2 - Parameter2 for entry point.
+# (rcx) NewStack - The pointer to new stack.
+#
+# Returns:
+#
+# None
+#
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(InternalSwitchStack)
+ASM_PFX(InternalSwitchStack):
+ mov %rdi, %rax
+ mov %rsi, %rdi
+ mov %rdx, %rsi
+ #
+ # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
+ # in case the callee wishes to spill them.
+ #
+ lea -0x20(%rcx), %rsp
+ call *%rax
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