diff options
Diffstat (limited to 'InOsEmuPkg/Unix/Sec/X64/SwitchStack.S')
-rw-r--r-- | InOsEmuPkg/Unix/Sec/X64/SwitchStack.S | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/InOsEmuPkg/Unix/Sec/X64/SwitchStack.S b/InOsEmuPkg/Unix/Sec/X64/SwitchStack.S new file mode 100644 index 0000000000..0d4e5029c9 --- /dev/null +++ b/InOsEmuPkg/Unix/Sec/X64/SwitchStack.S @@ -0,0 +1,112 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+# Portitions copyright (c) 2011, Apple Inc. All rights reserved.
+# 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.
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+# Routine Description:
+#
+# Routine for switching stacks with 3 parameters EFI ABI
+# Convert UNIX to EFI ABI
+#
+# Arguments:
+#
+# (rdi) EntryPoint - Entry point with new stack.
+# (rsi) Context1 - Parameter1 for entry point. (rcx)
+# (rdx) Context2 - Parameter2 for entry point. (rdx)
+# (rcx) Context3 - Parameter3 for entry point. (r8)
+# (r8) NewStack - The pointer to new stack.
+#
+# Returns:
+#
+# None
+#
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(PeiSwitchStacks)
+ASM_PFX(PeiSwitchStacks):
+ pushq $0 // tells gdb to stop unwinding frame
+ movq %rsp, %rbp
+
+ movq %r8, %rsp
+
+ movq %rdi, %rax
+ movq %rsi, %rcx
+ movq %rcx, %r8
+
+ #
+ # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
+ # in case the callee wishes to spill them.
+ #
+ subq $32, %rsp // 32-byte shadow space plus alignment pad
+ call *%rax
+
+
+
+// EFI_STATUS
+// EFIAPI
+// SecTemporaryRamSupport (
+// IN CONST EFI_PEI_SERVICES **PeiServices, // %rcx
+// IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase, // %rdx
+// IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase, // %r8
+// IN UINTN CopySize // %r9
+// )
+//
+ASM_GLOBAL ASM_PFX(GasketSecTemporaryRamSupport)
+ASM_PFX(GasketSecTemporaryRamSupport):
+ // Adjust callers %rbp to account for stack move
+ subq %rdx, %rbp // Calc offset of %rbp in Temp Memory
+ addq %r8, %rbp // add in permanent base to offset
+
+ pushq %rbp // stack frame is for the debugger
+ movq %rsp, %rbp
+
+ pushq %rsi // %rsi & %rdi are volatile in Unix and callee-save in EFI ABI
+ pushq %rdi
+
+ pushq %rdx // Save TemporaryMemoryBase
+ pushq %r8 // Save PermanentMemoryBase
+ pushq %r9 // Save CopySize
+
+ //
+ // Copy all of temp RAM to permanent memory, including stack
+ //
+ // CopyMem (PermanentMemoryBase, TemporaryMemoryBase, CopySize);
+ // %rdi, %rsi, %rdx
+ movq %r8, %rdi // Swizzle args
+ movq %rdx, %rsi
+ movq %r9, %rdx
+ call ASM_PFX(CopyMem)
+ // Temp mem stack now copied to permanent location. %esp still in temp memory
+
+ popq %r9 // CopySize (old stack)
+ popq %r8 // PermanentMemoryBase (old stack)
+ popq %rdx // TemporaryMemoryBase (old stack)
+
+ movq %rsp, %rcx // Move to new stack
+ subq %rdx, %rcx // Calc offset of stack in Temp Memory
+ addq %r8, %rcx // Calc PermanentMemoryBase address
+ movq %rcx, %rsp // Update stack
+ // Stack now points to permanent memory
+
+ // ZeroMem (TemporaryMemoryBase /* rdi */, CopySize /* rsi */);
+ movq %rdx, %rdi
+ movq %r9, %rsi
+ call ASM_PFX(ZeroMem)
+
+ // This data comes off the NEW stack
+ popq %rdi
+ popq %rsi
+ popq %rbp
+ ret
+
+
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